Title of Invention	ELASTIC DRAINAGE PAVEMENT COMPRISING WASTE POLYURETHANE CHIPS FOR USE ON EXISTING ROADS AND A PAVING METHOD USING THE SAME.
Abstract	The present invention provides an elastic drainage pavement comprising waste-polyurethane chips for use on existing roads and a paving method using the same, which uses a binder specially developed to secure the binding between an upper polyurethane-chip layer and a lower existing-pavement layer as well as the binding among the waste-polyurethane chips, resulting in excellent strength and durability, and uses recycled polyurethane chips to provide elasticity and permeability suitable for sports activities, walking, outdoor exercises and the like.

Title of Invention

ELASTIC DRAINAGE PAVEMENT COMPRISING WASTE POLYURETHANE CHIPS FOR USE ON EXISTING ROADS AND A PAVING METHOD USING THE SAME.

Abstract

The present invention provides an elastic drainage pavement comprising waste-polyurethane chips for use on existing roads and a paving method using the same, which uses a binder specially developed to secure the binding between an upper polyurethane-chip layer and a lower existing-pavement layer as well as the binding among the waste-polyurethane chips, resulting in excellent strength and durability, and uses recycled polyurethane chips to provide elasticity and permeability suitable for sports activities, walking, outdoor exercises and the like.

Full Text	FIELD OF THE INVENTION The present invention relates to an elastic drainage pavement comprising wastc-polyurethane chips for use on existing roads and a paving method using the same. This pavement uses a binder specially developed to secure the binding between an upper polyuretbane chip layer and a lower existing pavement layer as well as the binding among the wastc-polyurcthanc chips, resulting in excellent strength and durability, and uses recycled waste-polyurethane chips to provide elasticity and draining property suitable for sports activities, walking, outdoor exercises and the like. BACKGROUND OF THE INVENTION When a heavy rain falls on conventional existing asphalt or concrete pavement, the rain docs not sink into the ground, but flows through roadside drainage system to river, stream, waste water treatment plant or public water area. However/ in : case of a localized torrential downpour for a short period of time or a heavy rain for a long period of time during the rainy season, the drained rain and water may overflow : the river and stream, causing very dangerous and unstable situation. Also, as the rain and water cannot permeate into the conventional existing road or pavement, it obstructs safe passage and causes a lot of inconvenience to pedestrians. Therefore, in order to overcome such disadvantages of the eopyentipnal asphalt or concrete pavement, a permeable concrete pavement comprising aggregates of the size generally less than 13 mm to maintain suitable porosity and strength, and allowing water to seep into the ground through a surface layer and a base layer of the pavement has been suggested and used. Specifically, the permeable concrete allows rain or water to seep into the; ground through pores among the aggregates, fostering the growth of trees and plains, and also prevents flooding of the river by allowing heavy or torrential rain to flow under tho earth. Further, as the rain or water does not stay on the permeable concrete pavement, it provides less slippery and much safer walking, jogging or driving conditions. For these reasons, the permeable concrete pavement has come into use. more widely, especially on trails at parks, bicycle paths, tracks for in-line skating, golf-course trails, etc. Conventional permeable pavements are divided into permeable asphalt concrete and permeable cement concrete. However, the asphalt concrete has disadvantages in that the surface deforms considerably due to high temperatures during the summer season and the pores get clogged up due to the viscosity of the asphalt. Also, the cement concrete is so rigid that people get hurt when they fall on it. In addition, the conventional permeable-concrete pavement is covered with epoxy pigments for cosmetic view of the surface, but a ramp covered with, such epoxy pigments is more slippery than a normal concrete pavement, which causes problems in safety. Further, because the surface of the concrete pavement is rugged, the surface can peel or break off and when the pores are covered with dust, the pavement"s permeability deteriorates, requiring additional maintenance costs for declogging the pores, i.e. removal of the dust. As an example to improve the di sadvantages of the conventional permeable concrete, Korean Patent No. 404679 (patented on October 27,2003 entitled "pavement using waste tire chips") discloses an clastic permeable pavement which comprises a land layer, a filter layer, a rubble layer, a permeable concrete layer, a waste-polyurethane chip layer, and a surface layer from the bottorn to the top. Specifically, the filter layer is constructed by spreading small aggregates (sand), and the rubble layer is constructed by pouring and hardening concrete rubbles of the patticlo size 25mm or less onto the filter layer. The permeable concrete layer is made by blending aggregates of the particle size 5-13mm, cement and admixture products with water, and pouring this mixture on the rubble layer and curing it. As a result, the permeable concrete layer has the compresaivc strength of 100 kg/cm2 or more and the permeability coefficient of 1x1O-3 cm/soc or more. Further, the waste_tire chip layer is formed by pouring and spreading in the thickness of 10-20mm a inixturo including , waste-tire chips of particle size 2.5-7mm; a binder comprising 10-25g of urcthane rosin, epoxy resin or acrylic resin based on lOOg of the waste tixe chipsj, and l-4g of an inorganic pigment on the same base. Furthermore, the surface layer is colored by spraying with the urethane resin, cpoxy resin or acrylic resin on the waste-tire chip layer. The olastic permeable pavement as disclosed in the, above, patent allows rain or water to penetrate into the ground, and the pavement is resistant to slipping and reduces diffused light-reflection resulted from the water staying on. tho pavement, thus securing safe passage of pedestrians and providing comfortable vision. Also, as using waste tires which have been one of the environmental pollutants, the pavement not only absorbs impact on foot, but also contributes to the protection of environment and recycling of resources. However, since the waste tire"s smell of rubber lasted for a, long time, the pavement using the waste tire could not provide a pleasant sense of smell. Further, since the urothane, opoxy and acrylic resin binders used in the above patent were those available in the market, there have been demands for a special binder which enhances the adhesive strength among pavement materials and maintains the strength and durability of the pavement for a long time. Further, since the clastic permeable pavement in the above patent used a method of piling up the land layer, the filter layer, the rubble layer, the permeable concrete layer, the waste-polyurethane chip layer and the surface layer from the bottorn, in a case where it was not necessary to dig open an existing pavement to newly pavp it again, or in a case where there was no sufficient budget for such a pavement, such a pavement construction method of piling up the layers would not be economical in terms of process, time and cost. Instpad, although the existing pavement is not permeable, if it is covered with a permeable pavement so that the rain can pass through the permeable pavement and drain, it would not only be possible to prevent the overflow of the rivor or stream, : but also be very economical since the existing pavement can be used as it is. Therefore, the inventor of the present invention studied and researched into materials and binders for the elastic permeable pavement, and as a result, the inventor completed the present invention by using waste-polyurethane chips in place of waste- tire chips as a main component of the elastic pavement and developing a binder to secure the binding between an upper polyurethane-chip layer and a lower existing- pavement layer as well as the binding among the waste-polyurethanc chips. I SUMMARY OF THE INVENTION The object of the present invention is to provide an plastic drainage pavement, which uses waste-polyurethane chips obtained from soles of shoes, parts of toys, parts of refrigerators, parts of vehicles, and decrepit recycled-polyuretbane resilient pavement to solve the smelling problem of waste tires, nurse resources and prevent environmental pollution, and which is elastic and permeable to provide corn fort and shock absorption in walking as well. Another object of the present invention is to provide an elastic drainage " pavement and its paving method, which, uses a binder specially developed to secure, the binding between an upper waste-polyurothanc chip layer and a lower exisring-pavement layer as well as the binding among the waste-polyurethane chips, resulting in excellent strength and durability. A further object of the present invention is to provide an clastic drainage pavement for use on existing roads and its paving method, which comprises forming a permeable wastc-polyurcthanc chip layer on the existing pavement, to provide comfortablo vision due to the reduction of diffused light-reflection caused by water staying on the pavement, and to provide safer walking jogging or driving conditions, and also to prevent flooding of the river or stream due to heavy rain. A further object of the present invention is to provide an elastic drainage pavement and its paving method, which is economical by using the existing pavement as it is. In order to achieve the above objects, the elastic drainage pavement for use on existing pavements according to the present invention comprises a primer layer which is spread on the existing pavement and comprises 10-20 % by weight of PPG (polypropylene glycol), 5-10 % by weight of TMP (trimethylol propane), 5-10 % by weight of 1,3-BG (1,3-butylene glycol), 15-25 % by weight of TDI (toluene diisocyanate), 49-64.9 % by weight of a solvent (xylene or methylethylketone), and 0.1-1.0% by weight of an additive (defoaming agent); which is a combination of 1% by weight of polysiloxane solution and 99% by weight of diisobutylketone and an elastic drainage layer binder in the weight ratio of 3:1 to 4:1, the waste-polyurethane chips having the size of 1 to 5 mm and the binder comprising 50-70 % by weight of PPG, 5-10 % by weight of PBG (polybutadiene glycol), 3-5 % by weight of 1,3-BG, 20-30 % by weight of MDI (methylene diisocyanate) and 2-5 % by weight of TDI. In addition, according to the present invention, a method of paving the elastic drainage pavement on existing pavement is provided, which comprises cleaning the existing pavement; paving it with a primer layer and then an elastic drainage layer, wherein the primer layer comprises 10-20 % by weight of PPG, 5-10 % by weight of TMP, 5-10 % by weight of 1,3-BG, 15-25 % by weight of TDI, 49-64.9 % by weight of a solvent (xylene or methylethylketone), and 0.1-1.0 % by weight of an additive (defoaming agent), and the elastic drainage layer is prepared by mixing waste-polyurethane chips and a binder in the weight ratio of 3:1 to 4:1 and pouring the mixture onto the primer layer in situ, the waste-polyurethane chips having the size of 1 to 5 mm and the . binder comprising 50-70 % by weight of PPG, 5-10 % by weight of PBG, 3-5 % by weight of 1,3-BG, 20-30 % by weight of MDI and 2-5 % by weight of TDI; pressing with a roller of 20-30 kg heated to temperatures of 50-80 °C and trowelling the elastic drainage layer in the same temperature; and then curing for about 5 to 24 hours. The waste-polyurethane chips used in the present invention are obtained by collecting waste-polyurethane scraps from soles of shoes, parts of toys, parts of refrigerators and vehicles, decrepit polyurethane resilient pavement, etc. and separating the scraps according to their colors; removing impurities attached on the scraps; pulverizing the waste-polyurethane scraps in a predetermined size; mixing the scraps with 0.3-1.0kg of stearic acid, 20-30kg of heavy calcium carbonate, 0.1-2.0kg of titanium dioxide as a decolorant and white pigment and 5kg or less of a pigment, based on 100kg of the pulverized waste-polyurethane scraps by stirring; heating and extruding the mixture; and then condensing and cutting the extruded mixture into a predetermined size. In the present invention, a photoluminescent pigment, which emits light at night or darkness in case of rain by using the energy that has been accumulated during the daytime, can be used as the pigment, and zinc sulfide compounds can be used for this purpose. In this case, the amount of the photoluminescent pigment used is 20-40% by weight of the scraps. For instance, waste-polyurethane chips made by using the photoluminescent pigment can be prepared separately from the chips made by using a normal pigment for example iron oxide as red pigment, chromium oxide as green pigment and phthalocyanine as organic pigment, in a predetermined ratio, and they can be mixed with the binder respectively at a construction site, so that they be distributed and spread in their respective positions that have been designed previously. If a flame retarding property is required in preparing the waste-polyurethane chips, a flame retardant such as melamine polyphosphate (MPP) in the range of 1-2% by weight of the scraps can be added to the mixture. Further, depending on usages of the elastic drainage pavement, a foaming agent such as sodium hydrogen carbonate can be used to adjust the hardness of the waste-polyurethane chips. For example, the waste-polyurethane chips made by using a relatively large amount of the foaming agent can be used for sidewalks and trails, while the relatively hard polyurethane chips made by using less amount of the foaming agent can be used for bicycle paths and tracks for in-line skating. The size of the waste-polyurethane chips can vary according to their usage, e.g., in l-2mm, 2-3mm, 3-4mm, l-5mm, etc. Smaller ones can be used for bicycle paths and tracks for in-line skating, and larger ones for sidewalks and trails. In particular, the polyurethane chips for trails maybe formed in part or entirely in the shape of a strand having the length of 10-30mm and the thickness of 1-3mm, so that the chips can form large pores, providing more cushion and enhancing the permeability. The waste-polyurethane chips in the elastic drainage layer can be replaced in part or entirely with new polyurethane chips. The new polyurethane chips are prepared by mixing 1 part by weight of liquid polyurethane with 0.5-1.2 parts by weight of heavy calcium carbonate, and 0.01 part by weight or less of a pigment or 0.1-0.4 parts by weight of a photo luminescent pigment by stirring; pouring the mixture into a mold and curing in a sheet form; and then cutting and pulverizing the polyurethane sheet into a predetermined size. The new polyurethane chips manufactured as such are very clear in color. In addition, the binder used in the present invention is to secure the binding between the clastic drainage layer and the existing pavement and also among the waste-polyurethane chips in tho elastic drainage layer. Usually, compounds having molecular weight of 1,000-5,000 and having moro than two hydroxy groups (-OH) or multi-functionalisocyanate compounds (-NCO) arc used as the binder. For cxamplo, TDI and MDI are used as the chip binders. However, the adhesive property and the coefficient of expansion of the binders arc variable depending on thoir molar ratio. Therefore, the inventor of the present invention developed a binder suitable for achieving the objects of the invention and having the elasticity and the coefficient of expansion similar to those of the polyurethane chips to provide an excellent adhesive property among the chips. This specially developed binder according to the present invention comprises 50-70 % by weight of PPG, 5-1Q % by weight of PBG, 3-5 % by weight of 1,3-BG, 20-30 % by weight of MDI and 2-5 % by weight of TDI, wherein PPG is to provide toughness and 1,3-BG is used as a chain extender to form a polymer having higher molecular weight than a simple compound produced, by the reaction between PPG and MDI, The binder of the present invention, therefore, docs not only have a high adhesiveness and coefficient of expansion, but also has tensile strength and pliability from a primary reaction with MDI and a secondary reaction with TDI. It is preferable that tho polyurethane chips and the binder arc blended in the , weight ratio of 3:1 to 4:1. This is because use of the binder less than 20% by weight results in poor adhesivo property, and use of more than 40% causes the, pores to be clogged or the binder to be blown up during the curing step, Further, the composition and tho composition ratio of the primer layer are the optimum values that have been obtained by tho inventor as a result of a long time research. The clastic drainage pavement according to the present invention is economical since it can be applied upon the existing street or pavement without scratching or digging out the existing pavement. It is only necessary to clean up the existing pavement by removing impurities thcrofrom, since the existence of such impurities may be an obstacle to the primer layer"s adhering to the existing payement. If the existing pavement is made up of tiles having smooth surface, it is preferable to use a strong cpoxy or grind the surface before coating the primer layer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The principal of the present invention will be described in more detail below with reference to the embodiments, but the scope of the invention is not limited within the embodiments. 1. Preparation of wasto-polyurothano chips As a preliminary step, waste-polyurethane scraps were collected from spies of shoes, parts of toys, parts of refrigerators and vehicles, decrepit pplyurethane reslient pavement, etc., and separated according to their colors. From the separated waste-polyurethanc scraps, impurities stuck thereto were removed by cutting. Then, the waste-polyurethane scraps were pulverized in a crusher into the particle diameter of3-30mm, and transported to a mixer. Based on 100kg of the pulverized wastc-polyurethanc scraps, 0.5kg of stcaric acid, 25kg of heavy calcium carbonate, 0.2kg of tianium dioxide and 1,5kg of a pigment were added and mixed by stirring. Then, the mixture was transported through a conveyor to an extruder where the mixture was extruded in the form of a plate. The extruded waste-polyurethane was passed to a second crusher and a cutter to be cut in the particle size of l-5mm, resulting in the production of waste-polyurethane chips. In this embodiment, if the flame retarding property is required, a flame rctardant in the range of 1-2% by weight of the scraps can be added to the mixture. 2. Preparation of binder 30kg of PPG and 5kg of PBG were prepared as polyol cpmpounds. Also, 13kg of MDI and 2kg of TDI as multi-functional isocyanate compounds and 2kg of 1,3-BG as a chain extender were prepared. The above compounds were mixed with an accelerator and reacted to produce a binder having the following physical properties; Tensile strength (kg/cnf) 10 ±5 Tear strength (kg/cm) 7±3 3. Site preparation; (1) The existing pavement was cleaned up and impurities thereon were removed. (2) In order to pave the elastic drainage pavement on the existing tiles, the smooth surface of the tiles was grounded. 4. Primer layer A primer composition prepared by mixing 5kg of PPG, 3kg of TMP, 2kg of 1,3-BG, 7kg of TDI, 17kg of xylene as a solvent and 0.3kg of a defoaming agent was spread on the existing pavement and the tiles as prepared above. 5. Elastic drainage pavement [Embodiment 1] 100kg of the waste-polyurethane chips having the si ze of 1 to 3mm and 30kg of the binder were blcndod in situ, This mixture was poured onto the primer layer which has been spread on the existing pavement or the tiles in the thickness of 10-20mm, and the spread mixture was pressed with a roller of 30 kg which has been heated to temperatures of abput 80C and trowelled at the same temperature. Then, the pavement was cured for about 24 hours, during which the construction site was closed to traffic. The clastic drainage pavement obtained as such had the strength and elasticity suitable for bicycle paths and tracks for in-line skating. Change of pigments of the waste-polyurcthane chips made it possible to diversify the appearance of the elastic drainage pavement by having various colors and shapes. [Embodiment 2] In order to form an elastic drainage pavement suitable for walking, the waste-polyurcthanc chips having the size of 3 to 5mm on aycrage and those having the length of 15mm and the thickness of 1 mm in a strand shapp were prepared and respectively blended with the binder in the ratio of 3; 1.. The mixture was proceeded in the same manner as in Embodiment 1. As a result, the elastic drainage pavement suitable fpr walking was obtained, and this pavement had pores larger than that produced in Embodiment 1 and was softer and more effective in drainage. [Embodiment 3] In this embodiment, the waste-polyurethane chips having the size of 3 to 5mm on average were prepared by using a normal pigment and the chips having the same size were separately prepared by using a photoluminescent pigment ,(zinc sulfide), each of which were then blended with the binder in the ratio of 3:1 in situ, The waste-polyurcthane chip mixture using the normal pigment was poured in the thickness of 10-20mm outside of a frame, e.g. a star shape frame, which has been preliminarily placed on. the primer layer, and the waster-polyurothane chip mixture using I the photoluminesccnt pigment was poured inside of the frame, Then, tho both poured chips were pressed with a roller of 30 kg heated to temperatures of about 800C and trowelled at the same temperature. As a result, the elastic drainage pavement obtained on. the existing pavement had the strength and optimum elasticity suitable for trails, and the pavement obtained on the existing tiles had the strength and elasticity suitable for walking and for other various usages. Further, as the photoluminescent polyurethanc chips could be disposed in various constellations, the chips emit light in the evening or at night (darkness), providing visual pleasure for pedestrians and helping students or children to study constellations. [Embodiment 4] 50kg of the waste-polyurethane chips obtained from the above Embodiment 1 was used together with 50kg of polyurethane chips prepared by using new polyutethanc material to be blended with the binder. The urethanc chips using the new polyurethanc material were prepared by mixing 50kg of liquid polyurcthane with 35kg of heavy calcium carbonate arid 0,5kg of a pigment in a high-speed stirrer of more than lOOOrpm, pouring and curing the mixture in a frame in the shape of a plate, and then pulverizing the cured, mixture into the particle size of 3-5mm. The other procedures were the same as in Embodiment 1, and as & result the i elastic drainage pavement in much clearer color was .obtained. As described above, the elastic drainage pavement according to the present invention, which uses wastc-polyurethane chips obtained from soles of shoes, parts of toys, parts of refrigerators and vehicles and decrepit recyclcd-polyurethane resilient pavement, solves tho smelling problem of wasto tires, nurses resources and prevents environmental pollution. The drainage pavement is also elastic and permeable so that it can provide comfort and shock absorption in walking. Further, according to the present invention, the clastic drainage pavement and its paving method use the binder specially developed to secure the binding between the polyurethane-chip layer and the existing-pavement layer as well as the binding among the waste-polyurcthane chips, resulting in excellent strength and durability. Furthermore, the clastic drainage pavement for use on existing roads according to the present invention, which comprises forming a permeable wastc-polyurcthane chip layer on the existing pavement, provides comfortable vision due to the reduction of diffused light-reflection resulted from the water staying on the pavement and provides safer walking, jogging or driving conditions. Also, the pavement prevents flooding of the river or stream due to heavy rain. In addition, the present invention provides clastic drainage pavement and its paving method, which is economical by using the existing pavement as it is. It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit and scope of the invention. The present invention covers the modifications and variations thereof provided they come within the scope of the appended claims and their equivalents. I CLAIM: 1. Elastic drainage pavement for use on existing pavement comprising a primer layer which is provided on the existing pavement and comprises 10-20% by weight of polypropylene glycol, 5-10% by weight of trimethylol propane, 5-10% by weight of 1,3- butylene glycol, 15-25% by weight of toluene diisocyanate, 49-64.9% by weight of a solvent which is either xylene or methylethylketone and 0.1-1.0% by weight of a defoaming agent such as herein described and an elastic drainage layer spread over the primer layer and prepared by mixing waste-polyurethane chips and a binder in the weight ratio of 3:1 to 4:1, the waste-polyurethane chips having the size of 1 to 5 mm, and the binder comprising 50-70% by weight of polypropylene glycol, 5-10% by weight of polybutadiene glycol, 3-5% by weight of 1,3-butylene glycol, 20-30% by weight of methylene diisocynate and 2-5% by weight of toluene diisocynate. 2. Elastic drainage pavement as claimed in claim 1, wherein the waste polyurethane chips are obtained by collecting waste-polyurethane scraps from soles of shoes, parts of toys, parts of refrigerators and vehicles, decrepit polyurethane resilient pavement, etc. and separating the scraps according to their colors; removing impurities attached on the scraps; pulverizing the waste-polyurethane scraps into a predetermined size; mixing the scraps with 0.3-1.0kg of stearic acid, 20-30kg of heavy calcium carbonate, 0.1-2.0kg of titanium dioxide and 5kg or less of a pigment or 20-40kg of a photoluminescent pigment, based on 100kg of the pulverized waste-polyurethane scraps by stirring; heating and extruding the mixture in the form of a plate; and then condensing and cutting the extruded mixture in the size of 1 to 5 mm. 3. Elastic drainage pavement as claimed in claim 2, wherein a flame retardant such as herein described, is added to the mixture in the range of 1 -2% by weight of the scraps in preparing the waste-polyurethane chips. 4. Elastic drainage pavement as claimed in claim 2 or 3, wherein depending on usages of the elastic pavement, a foaming agent such as herein described, is used to adjust the hardness of the waste-polyurethane chips. 5. Elastic drainage pavement as claimed in claim 2 or 3, wherein the waste-polyurethane chips are cut in the shape of a strand having the length of 10-30mm and the thickness of l-3mm to be used in part with the waste-polyurethane chips having the size of 1 to 5 mm. 6. Elastic drainage pavement as claimed in claim 1 or 2, wherein the waste-polyurethane chips are replaced in part with new polyurethane chips. 7. Elastic drainage pavement as claimed in claim 6, wherein the new polyurethane chips are prepared by mixing 1 part by weight of liquid polyurethane with 0.5-1.2 parts by weight of heavy calcium carbonate, and 0.01 part by weight or less of a pigment or 0.1 -0.4 parts by weight of a photoluminescent pigment; pouring the mixture in a mold and curing in a sheet form; and then pulverizing the polyurethane sheet into the particle size of l-5mm. 8. A method of paving elastic pavement on existing pavement comprising the steps of: cleaning the existing pavement; paving the existing pavement with a primer layer as claimed in claim 1, and then an elastic drainage layer, pressing with a roller of 20-30 kg heated to temperatures of 50-80° C and trowelling the clastic drainage layer in the same temperature; and then curing for 5 to 24 hours. 9. A method of paving elastic drainage pavement as claimed in claim 8, wherein the waste-polyurethane chips are obtained by collecting waste-polyurethane scraps from soles of shoes, parts of toys, parts of refrigerators and vehicles, decrepit polyurethane resilient pavement, etc. and separating the scraps according to their colors; removing impurities attached on the scraps; pulverizing the waste-polyurethane scraps into a predetermined size; mixing the scraps with 0.3-1.0kg of stearic acid, 20-30kg of heavy calcium carbonate, 0.1-2.0kg of titanium dioxide and 5kg or less of a pigment or 20-40kg of a photoluminescent pigment, based on 100kg of the pulverized waste-polyurethane scraps by stirring; heating and extruding the mixture in the form of a plate; and then condensing and cutting the extruded mixture in the size of 1 to 5 mm. 10. A method of paving elastic pavement on existing pavement as claimed in claim 9, wherein the waste-polyurethane chips made by using the pigment, such as herein described and the waste-polyurethane chips made by using the photoluminescent pigment are separately prepared and respectively mixed with the binder, so that they can separately distributed and spread in their predetermined positions. 11. A method of paving elastic pavement on existing pavement as claimed in claim 8 or 9, wherein the waste-polyurethane chips are replaced in part with new polyurethane chips. 12. A method of paving elastic drainage pavement as claimed in claim 11, wherein the new polyurethane chips are prepared by mixing 1 part by weight of liquid polyurethane with 0.5-1.2 parts by weight of heavy calcium carbonate, and 0.01 part by weight or less of a pigment or 0.1-0.4 parts by weight of a photoluminescent pigment; pouring the mixture in a mold and curing in a sheet form; and then pulverizing the polyurethane sheet into the particle size of l-5mm. 13. Elastic drainage pavement, substantially as herein described, particularly with reference to the foregoing examples. 14. A method of paying elastic drainage pavement, substantially as herein described, particularly with reference to the foregoing examples. The present invention provides an elastic drainage pavement comprising waste-polyurethane chips for use on existing roads and a paving method using the same, which uses a binder specially developed to secure the binding between an upper polyurethane-chip layer and a lower existing-pavement layer as well as the binding among the waste-polyurethane chips, resulting in excellent strength and durability, and uses recycled polyurethane chips to provide elasticity and permeability suitable for sports activities, walking, outdoor exercises and the like.

Full Text

FIELD OF THE INVENTION
The present invention relates to an elastic drainage pavement comprising
wastc-polyurethane chips for use on existing roads and a paving method using the same.
This pavement uses a binder specially developed to secure the binding between an
upper polyuretbane chip layer and a lower existing pavement layer as well as the
binding among the wastc-polyurcthanc chips, resulting in excellent strength and
durability, and uses recycled waste-polyurethane chips to provide elasticity and draining
property suitable for sports activities, walking, outdoor exercises and the like.
BACKGROUND OF THE INVENTION
When a heavy rain falls on conventional existing asphalt or concrete
pavement, the rain docs not sink into the ground, but flows through roadside drainage
system to river, stream, waste water treatment plant or public water area. However/ in :
case of a localized torrential downpour for a short period of time or a heavy rain for a
long period of time during the rainy season, the drained rain and water may overflow :
the river and stream, causing very dangerous and unstable situation. Also, as the rain
and water cannot permeate into the conventional existing road or pavement, it obstructs
safe passage and causes a lot of inconvenience to pedestrians.
Therefore, in order to overcome such disadvantages of the eopyentipnal
asphalt or concrete pavement, a permeable concrete pavement comprising aggregates of
the size generally less than 13 mm to maintain suitable porosity and strength, and
allowing water to seep into the ground through a surface layer and a base layer of the
pavement has been suggested and used.
Specifically, the permeable concrete allows rain or water to seep into the;
ground through pores among the aggregates, fostering the growth of trees and plains,
and also prevents flooding of the river by allowing heavy or torrential rain to flow under
tho earth. Further, as the rain or water does not stay on the permeable concrete
pavement, it provides less slippery and much safer walking, jogging or driving
conditions.

For these reasons, the permeable concrete pavement has come into use. more

widely, especially on trails at parks, bicycle paths, tracks for in-line skating, golf-course
trails, etc.

Conventional permeable pavements are divided into permeable asphalt
concrete and permeable cement concrete. However, the asphalt concrete has
disadvantages in that the surface deforms considerably due to high temperatures during
the summer season and the pores get clogged up due to the viscosity of the asphalt. Also,
the cement concrete is so rigid that people get hurt when they fall on it.
In addition, the conventional permeable-concrete pavement is covered with
epoxy pigments for cosmetic view of the surface, but a ramp covered with, such epoxy
pigments is more slippery than a normal concrete pavement, which causes problems in
safety.
Further, because the surface of the concrete pavement is rugged, the surface
can peel or break off and when the pores are covered with dust, the pavement"s
permeability deteriorates, requiring additional maintenance costs for declogging the
pores, i.e. removal of the dust.
As an example to improve the di sadvantages of the conventional permeable
concrete, Korean Patent No. 404679 (patented on October 27,2003 entitled "pavement
using waste tire chips") discloses an clastic permeable pavement which comprises a
land layer, a filter layer, a rubble layer, a permeable concrete layer, a
waste-polyurethane chip layer, and a surface layer from the bottorn to the top.
Specifically, the filter layer is constructed by spreading small aggregates (sand), and the
rubble layer is constructed by pouring and hardening concrete rubbles of the patticlo
size 25mm or less onto the filter layer. The permeable concrete layer is made by
blending aggregates of the particle size 5-13mm, cement and admixture products with
water, and pouring this mixture on the rubble layer and curing it. As a result, the
permeable concrete layer has the compresaivc strength of 100 kg/cm2 or more and the
permeability coefficient of 1x1O-3 cm/soc or more. Further, the waste_tire chip layer is
formed by pouring and spreading in the thickness of 10-20mm a inixturo including ,
waste-tire chips of particle size 2.5-7mm; a binder comprising 10-25g of urcthane rosin,
epoxy resin or acrylic resin based on lOOg of the waste tixe chipsj, and l-4g of an
inorganic pigment on the same base. Furthermore, the surface layer is colored by
spraying with the urethane resin, cpoxy resin or acrylic resin on the waste-tire chip
layer.
The olastic permeable pavement as disclosed in the, above, patent allows rain
or water to penetrate into the ground, and the pavement is resistant to slipping and
reduces diffused light-reflection resulted from the water staying on. tho pavement, thus
securing safe passage of pedestrians and providing comfortable vision. Also, as using
waste tires which have been one of the environmental pollutants, the pavement not only
absorbs impact on foot, but also contributes to the protection of environment and
recycling of resources.
However, since the waste tire"s smell of rubber lasted for a, long time, the
pavement using the waste tire could not provide a pleasant sense of smell. Further, since
the urothane, opoxy and acrylic resin binders used in the above patent were those
available in the market, there have been demands for a special binder which enhances
the adhesive strength among pavement materials and maintains the strength and
durability of the pavement for a long time.
Further, since the clastic permeable pavement in the above patent used a
method of piling up the land layer, the filter layer, the rubble layer, the permeable
concrete layer, the waste-polyurethane chip layer and the surface layer from the bottorn,
in a case where it was not necessary to dig open an existing pavement to newly pavp it
again, or in a case where there was no sufficient budget for such a pavement, such a
pavement construction method of piling up the layers would not be economical in terms
of process, time and cost.
Instpad, although the existing pavement is not permeable, if it is covered
with a permeable pavement so that the rain can pass through the permeable pavement
and drain, it would not only be possible to prevent the overflow of the rivor or stream, :
but also be very economical since the existing pavement can be used as it is.
Therefore, the inventor of the present invention studied and researched into
materials and binders for the elastic permeable pavement, and as a result, the inventor
completed the present invention by using waste-polyurethane chips in place of waste-
tire chips as a main component of the elastic pavement and developing a binder to
secure the binding between an upper polyurethane-chip layer and a lower existing-
pavement layer as well as the binding among the waste-polyurethanc chips.
I
SUMMARY OF THE INVENTION
The object of the present invention is to provide an plastic drainage
pavement, which uses waste-polyurethane chips obtained from soles of shoes, parts of
toys, parts of refrigerators, parts of vehicles, and decrepit recycled-polyuretbane
resilient pavement to solve the smelling problem of waste tires, nurse resources and
prevent environmental pollution, and which is elastic and permeable to provide corn fort
and shock absorption in walking as well.
Another object of the present invention is to provide an elastic drainage "
pavement and its paving method, which, uses a binder specially developed to secure, the
binding between an upper waste-polyurothanc chip layer and a lower exisring-pavement
layer as well as the binding among the waste-polyurethane chips, resulting in excellent
strength and durability.
A further object of the present invention is to provide an clastic drainage
pavement for use on existing roads and its paving method, which comprises forming a
permeable wastc-polyurcthanc chip layer on the existing pavement, to provide
comfortablo vision due to the reduction of diffused light-reflection caused by water
staying on the pavement, and to provide safer walking jogging or driving conditions,
and also to prevent flooding of the river or stream due to heavy rain.
A further object of the present invention is to provide an elastic drainage
pavement and its paving method, which is economical by using the existing pavement
as it is.
In order to achieve the above objects, the elastic drainage pavement for use
on existing pavements according to the present invention comprises a primer layer
which is spread on the existing pavement and comprises 10-20 % by weight of PPG
(polypropylene glycol), 5-10 % by weight of TMP (trimethylol propane), 5-10 % by
weight of 1,3-BG (1,3-butylene glycol), 15-25 % by weight of TDI (toluene
diisocyanate), 49-64.9 % by weight of a solvent (xylene or methylethylketone), and
0.1-1.0% by weight of an additive (defoaming agent); which is a combination of 1% by weight
of polysiloxane solution and 99% by weight of diisobutylketone and an elastic drainage layer
binder in the weight ratio of 3:1 to 4:1, the waste-polyurethane chips having the size of
1 to 5 mm and the binder comprising 50-70 % by weight of PPG, 5-10 % by weight of
PBG (polybutadiene glycol), 3-5 % by weight of 1,3-BG, 20-30 % by weight of MDI
(methylene diisocyanate) and 2-5 % by weight of TDI.
In addition, according to the present invention, a method of paving the
elastic drainage pavement on existing pavement is provided, which comprises cleaning
the existing pavement; paving it with a primer layer and then an elastic drainage layer,
wherein the primer layer comprises 10-20 % by weight of PPG, 5-10 % by
weight of TMP, 5-10 % by weight of 1,3-BG, 15-25 % by weight of TDI, 49-64.9 % by
weight of a solvent (xylene or methylethylketone), and 0.1-1.0 % by weight of an
additive (defoaming agent),
and the elastic drainage layer is prepared by mixing waste-polyurethane
chips and a binder in the weight ratio of 3:1 to 4:1 and pouring the mixture onto the
primer layer in situ, the waste-polyurethane chips having the size of 1 to 5 mm and the
. binder comprising 50-70 % by weight of PPG, 5-10 % by weight of PBG, 3-5 % by
weight of 1,3-BG, 20-30 % by weight of MDI and 2-5 % by weight of TDI;
pressing with a roller of 20-30 kg heated to temperatures of 50-80 °C and
trowelling the elastic drainage layer in the same temperature; and then
curing for about 5 to 24 hours.
The waste-polyurethane chips used in the present invention are obtained by
collecting waste-polyurethane scraps from soles of shoes, parts of toys, parts of
refrigerators and vehicles, decrepit polyurethane resilient pavement, etc. and separating
the scraps according to their colors; removing impurities attached on the scraps;
pulverizing the waste-polyurethane scraps in a predetermined size; mixing the scraps
with 0.3-1.0kg of stearic acid, 20-30kg of heavy calcium carbonate, 0.1-2.0kg of
titanium dioxide as a decolorant and white pigment and 5kg or less of a pigment, based
on 100kg of the pulverized waste-polyurethane scraps by stirring; heating and extruding
the mixture; and then condensing and cutting the extruded mixture into a predetermined
size.
In the present invention, a photoluminescent pigment, which emits light at
night or darkness in case of rain by using the energy that has been accumulated during
the daytime, can be used as the pigment, and zinc sulfide compounds can be used for
this purpose. In this case, the amount of the photoluminescent pigment used is 20-40%
by weight of the scraps.
For instance, waste-polyurethane chips made by using the photoluminescent
pigment can be prepared separately from the chips made by using a normal pigment for
example iron oxide as red pigment, chromium oxide as green pigment and phthalocyanine
as organic pigment, in a predetermined ratio, and they can be mixed with the binder
respectively at a construction site, so that they be distributed and spread in their respective
positions that have been designed previously.
If a flame retarding property is required in preparing the waste-polyurethane chips, a flame
retardant such as melamine polyphosphate (MPP) in the range of 1-2% by weight of the scraps can
be added to the mixture.
Further, depending on usages of the elastic drainage pavement, a foaming agent such as
sodium hydrogen carbonate can be used to adjust the hardness of the waste-polyurethane chips. For
example, the waste-polyurethane chips made by using a relatively large amount of the foaming
agent can be used for sidewalks and trails, while the relatively hard polyurethane chips
made by using less amount of the foaming agent can be used for bicycle paths and
tracks for in-line skating.
The size of the waste-polyurethane chips can vary according to their usage,
e.g., in l-2mm, 2-3mm, 3-4mm, l-5mm, etc. Smaller ones can be used for bicycle paths
and tracks for in-line skating, and larger ones for sidewalks and trails. In particular, the
polyurethane chips for trails maybe formed in part or entirely in the shape of a strand
having the length of 10-30mm and the thickness of 1-3mm, so that the chips can form
large pores, providing more cushion and enhancing the permeability.
The waste-polyurethane chips in the elastic drainage layer can be replaced
in part or entirely with new polyurethane chips. The new polyurethane chips are
prepared by mixing 1 part by weight of liquid polyurethane with 0.5-1.2 parts by weight
of heavy calcium carbonate, and 0.01 part by weight or less of a pigment or 0.1-0.4
parts by weight of a photo luminescent pigment by stirring; pouring the mixture into a
mold and curing in a sheet form; and then cutting and pulverizing the polyurethane
sheet into a predetermined size. The new polyurethane chips manufactured as such are
very clear in color.
In addition, the binder used in the present invention is to secure the binding
between the clastic drainage layer and the existing pavement and also among the
waste-polyurethane chips in tho elastic drainage layer. Usually, compounds having
molecular weight of 1,000-5,000 and having moro than two hydroxy groups (-OH) or
multi-functionalisocyanate compounds (-NCO) arc used as the binder.
For cxamplo, TDI and MDI are used as the chip binders. However, the
adhesive property and the coefficient of expansion of the binders arc variable depending
on thoir molar ratio. Therefore, the inventor of the present invention developed a binder
suitable for achieving the objects of the invention and having the elasticity and the
coefficient of expansion similar to those of the polyurethane chips to provide an
excellent adhesive property among the chips. This specially developed binder according
to the present invention comprises 50-70 % by weight of PPG, 5-1Q % by weight of
PBG, 3-5 % by weight of 1,3-BG, 20-30 % by weight of MDI and 2-5 % by weight of
TDI, wherein PPG is to provide toughness and 1,3-BG is used as a chain extender to
form a polymer having higher molecular weight than a simple compound produced, by
the reaction between PPG and MDI, The binder of the present invention, therefore, docs
not only have a high adhesiveness and coefficient of expansion, but also has tensile
strength and pliability from a primary reaction with MDI and a secondary reaction with
TDI.
It is preferable that tho polyurethane chips and the binder arc blended in the ,
weight ratio of 3:1 to 4:1. This is because use of the binder less than 20% by weight
results in poor adhesivo property, and use of more than 40% causes the, pores to be
clogged or the binder to be blown up during the curing step,
Further, the composition and tho composition ratio of the primer layer are
the optimum values that have been obtained by tho inventor as a result of a long time
research.

The clastic drainage pavement according to the present invention is

economical since it can be applied upon the existing street or pavement without
scratching or digging out the existing pavement. It is only necessary to clean up the
existing pavement by removing impurities thcrofrom, since the existence of such
impurities may be an obstacle to the primer layer"s adhering to the existing payement. If
the existing pavement is made up of tiles having smooth surface, it is preferable to use a
strong cpoxy or grind the surface before coating the primer layer.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The principal of the present invention will be described in more detail below
with reference to the embodiments, but the scope of the invention is not limited within
the embodiments.
1. Preparation of wasto-polyurothano chips
As a preliminary step, waste-polyurethane scraps were collected from spies
of shoes, parts of toys, parts of refrigerators and vehicles, decrepit pplyurethane reslient
pavement, etc., and separated according to their colors. From the separated
waste-polyurethanc scraps, impurities stuck thereto were removed by cutting.
Then, the waste-polyurethane scraps were pulverized in a crusher into the
particle diameter of3-30mm, and transported to a mixer.
Based on 100kg of the pulverized wastc-polyurethanc scraps, 0.5kg of
stcaric acid, 25kg of heavy calcium carbonate, 0.2kg of tianium dioxide and 1,5kg of a
pigment were added and mixed by stirring.
Then, the mixture was transported through a conveyor to an extruder where
the mixture was extruded in the form of a plate.
The extruded waste-polyurethane was passed to a second crusher and a
cutter to be cut in the particle size of l-5mm, resulting in the production of
waste-polyurethane chips.
In this embodiment, if the flame retarding property is required, a flame
rctardant in the range of 1-2% by weight of the scraps can be added to the mixture.
2. Preparation of binder
30kg of PPG and 5kg of PBG were prepared as polyol cpmpounds. Also,
13kg of MDI and 2kg of TDI as multi-functional isocyanate compounds and 2kg of
1,3-BG as a chain extender were prepared.
The above compounds were mixed with an accelerator and reacted to
produce a binder having the following physical properties;
Tensile strength (kg/cnf) 10 ±5
Tear strength (kg/cm) 7±3

3. Site preparation;
(1) The existing pavement was cleaned up and impurities thereon were removed.
(2) In order to pave the elastic drainage pavement on the existing tiles, the smooth
surface of the tiles was grounded.
4. Primer layer
A primer composition prepared by mixing 5kg of PPG, 3kg of TMP, 2kg of
1,3-BG, 7kg of TDI, 17kg of xylene as a solvent and 0.3kg of a defoaming agent was
spread on the existing pavement and the tiles as prepared above.
5. Elastic drainage pavement
[Embodiment 1]
100kg of the waste-polyurethane chips having the si ze of 1 to 3mm and
30kg of the binder were blcndod in situ,
This mixture was poured onto the primer layer which has been spread on the
existing pavement or the tiles in the thickness of 10-20mm, and the spread mixture was
pressed with a roller of 30 kg which has been heated to temperatures of abput 80C and
trowelled at the same temperature.
Then, the pavement was cured for about 24 hours, during which the
construction site was closed to traffic.
The clastic drainage pavement obtained as such had the strength and
elasticity suitable for bicycle paths and tracks for in-line skating.
Change of pigments of the waste-polyurcthane chips made it possible to
diversify the appearance of the elastic drainage pavement by having various colors and
shapes.
[Embodiment 2]

In order to form an elastic drainage pavement suitable for walking, the
waste-polyurcthanc chips having the size of 3 to 5mm on aycrage and those having the
length of 15mm and the thickness of 1 mm in a strand shapp were prepared and
respectively blended with the binder in the ratio of 3; 1.. The mixture was proceeded in
the same manner as in Embodiment 1.
As a result, the elastic drainage pavement suitable fpr walking was obtained,
and this pavement had pores larger than that produced in Embodiment 1 and was softer
and more effective in drainage.
[Embodiment 3]
In this embodiment, the waste-polyurethane chips having the size of 3 to
5mm on average were prepared by using a normal pigment and the chips having the
same size were separately prepared by using a photoluminescent pigment ,(zinc sulfide),
each of which were then blended with the binder in the ratio of 3:1 in situ,
The waste-polyurcthane chip mixture using the normal pigment was poured
in the thickness of 10-20mm outside of a frame, e.g. a star shape frame, which has been
preliminarily placed on. the primer layer, and the waster-polyurothane chip mixture using
I
the photoluminesccnt pigment was poured inside of the frame, Then, tho both poured
chips were pressed with a roller of 30 kg heated to temperatures of about 800C and
trowelled at the same temperature.
As a result, the elastic drainage pavement obtained on. the existing pavement
had the strength and optimum elasticity suitable for trails, and the pavement obtained on
the existing tiles had the strength and elasticity suitable for walking and for other
various usages.
Further, as the photoluminescent polyurethanc chips could be disposed in
various constellations, the chips emit light in the evening or at night (darkness),
providing visual pleasure for pedestrians and helping students or children to study
constellations.
[Embodiment 4]
50kg of the waste-polyurethane chips obtained from the above Embodiment
1 was used together with 50kg of polyurethane chips prepared by using new

polyutethanc material to be blended with the binder.
The urethanc chips using the new polyurethanc material were prepared by
mixing 50kg of liquid polyurcthane with 35kg of heavy calcium carbonate arid 0,5kg of
a pigment in a high-speed stirrer of more than lOOOrpm, pouring and curing the mixture
in a frame in the shape of a plate, and then pulverizing the cured, mixture into the
particle size of 3-5mm.
The other procedures were the same as in Embodiment 1, and as & result the i
elastic drainage pavement in much clearer color was .obtained.
As described above, the elastic drainage pavement according to the present
invention, which uses wastc-polyurethane chips obtained from soles of shoes, parts of
toys, parts of refrigerators and vehicles and decrepit recyclcd-polyurethane resilient
pavement, solves tho smelling problem of wasto tires, nurses resources and prevents
environmental pollution. The drainage pavement is also elastic and permeable so that it
can provide comfort and shock absorption in walking.
Further, according to the present invention, the clastic drainage pavement
and its paving method use the binder specially developed to secure the binding between
the polyurethane-chip layer and the existing-pavement layer as well as the binding
among the waste-polyurcthane chips, resulting in excellent strength and durability.
Furthermore, the clastic drainage pavement for use on existing roads
according to the present invention, which comprises forming a permeable
wastc-polyurcthane chip layer on the existing pavement, provides comfortable vision
due to the reduction of diffused light-reflection resulted from the water staying on the
pavement and provides safer walking, jogging or driving conditions. Also, the pavement
prevents flooding of the river or stream due to heavy rain.

In addition, the present invention provides clastic drainage pavement and its
paving method, which is economical by using the existing pavement as it is.
It will be apparent to those skilled in the art that various modifications and
variations can be made to the present invention without departing from the spirit and

scope of the invention. The present invention covers the modifications and variations

thereof provided they come within the scope of the appended claims and their

equivalents.

I CLAIM:
1. Elastic drainage pavement for use on existing pavement comprising a primer layer
which is provided on the existing pavement and comprises 10-20% by weight of
polypropylene glycol, 5-10% by weight of trimethylol propane, 5-10% by weight of 1,3-
butylene glycol, 15-25% by weight of toluene diisocyanate, 49-64.9% by weight of a
solvent which is either xylene or methylethylketone and 0.1-1.0% by weight of a
defoaming agent such as herein described and an elastic drainage layer spread over the
primer layer and prepared by mixing waste-polyurethane chips and a binder in the weight
ratio of 3:1 to 4:1, the waste-polyurethane chips having the size of 1 to 5 mm, and the
binder comprising 50-70% by weight of polypropylene glycol, 5-10% by weight of
polybutadiene glycol, 3-5% by weight of 1,3-butylene glycol, 20-30% by weight of
methylene diisocynate and 2-5% by weight of toluene diisocynate.
2. Elastic drainage pavement as claimed in claim 1, wherein the waste
polyurethane chips are obtained by collecting waste-polyurethane scraps from soles of
shoes, parts of toys, parts of refrigerators and vehicles, decrepit polyurethane resilient
pavement, etc. and separating the scraps according to their colors; removing impurities
attached on the scraps; pulverizing the waste-polyurethane scraps into a predetermined
size; mixing the scraps with 0.3-1.0kg of stearic acid, 20-30kg of heavy calcium
carbonate, 0.1-2.0kg of titanium dioxide and 5kg or less of a pigment or 20-40kg of a
photoluminescent pigment, based on 100kg of the pulverized waste-polyurethane scraps
by stirring; heating and extruding the mixture in the form of a plate; and then
condensing and cutting the extruded mixture in the size of 1 to 5 mm.
3. Elastic drainage pavement as claimed in claim 2, wherein a flame retardant such as
herein described, is added to the mixture in the range of 1 -2% by weight of the scraps in
preparing the waste-polyurethane chips.
4. Elastic drainage pavement as claimed in claim 2 or 3, wherein depending on usages of
the elastic pavement, a foaming agent such as herein described, is used to adjust the hardness of
the waste-polyurethane chips.
5. Elastic drainage pavement as claimed in claim 2 or 3, wherein
the waste-polyurethane chips are cut in the shape of a strand having the length of
10-30mm and the thickness of l-3mm to be used in part with the waste-polyurethane
chips having the size of 1 to 5 mm.
6. Elastic drainage pavement as claimed in claim 1 or 2, wherein the waste-polyurethane
chips are replaced in part with new polyurethane chips.
7. Elastic drainage pavement as claimed in claim 6, wherein the new
polyurethane chips are prepared by mixing 1 part by weight of liquid polyurethane with
0.5-1.2 parts by weight of heavy calcium carbonate, and 0.01 part by weight or less of a
pigment or 0.1 -0.4 parts by weight of a photoluminescent pigment; pouring the mixture
in a mold and curing in a sheet form; and then pulverizing the polyurethane sheet into
the particle size of l-5mm.
8. A method of paving elastic pavement on existing pavement comprising the steps of:
cleaning the existing pavement;
paving the existing pavement with a primer layer as claimed in claim 1, and then an
elastic drainage layer,
pressing with a roller of 20-30 kg heated to temperatures of 50-80° C and trowelling the
clastic drainage layer in the same temperature; and then curing for 5 to 24 hours.
9. A method of paving elastic drainage pavement as claimed in claim 8,
wherein the waste-polyurethane chips are obtained by collecting waste-polyurethane
scraps from soles of shoes, parts of toys, parts of refrigerators and vehicles, decrepit
polyurethane resilient pavement, etc. and separating the scraps according to their colors;
removing impurities attached on the scraps; pulverizing the waste-polyurethane scraps
into a predetermined size; mixing the scraps with 0.3-1.0kg of stearic acid, 20-30kg of
heavy calcium carbonate, 0.1-2.0kg of titanium dioxide and 5kg or less of a pigment or
20-40kg of a photoluminescent pigment, based on 100kg of the pulverized
waste-polyurethane scraps by stirring; heating and extruding the mixture in the form of
a plate; and then condensing and cutting the extruded mixture in the size of 1 to 5 mm.
10. A method of paving elastic pavement on existing pavement as claimed in claim 9,
wherein the waste-polyurethane chips made by using the pigment, such as herein described and
the waste-polyurethane chips made by using the photoluminescent pigment are separately
prepared and respectively mixed with the binder, so that they can separately distributed and
spread in their predetermined positions.
11. A method of paving elastic pavement on existing pavement as claimed in claim 8 or 9,
wherein the waste-polyurethane chips are replaced in part with new polyurethane chips.
12. A method of paving elastic drainage pavement as claimed in claim 11,
wherein the new polyurethane chips are prepared by mixing 1 part by
weight of liquid polyurethane with 0.5-1.2 parts by weight of heavy calcium carbonate,
and 0.01 part by weight or less of a pigment or 0.1-0.4 parts by weight of a
photoluminescent pigment; pouring the mixture in a mold and curing in a sheet form;
and then pulverizing the polyurethane sheet into the particle size of l-5mm.
13. Elastic drainage pavement, substantially as herein described, particularly with reference
to the foregoing examples.
14. A method of paying elastic drainage pavement, substantially as herein described,
particularly with reference to the foregoing examples.
The present invention provides an elastic drainage pavement comprising
waste-polyurethane chips for use on existing roads and a paving method using the same,
which uses a binder specially developed to secure the binding between an upper
polyurethane-chip layer and a lower existing-pavement layer as well as the binding
among the waste-polyurethane chips, resulting in excellent strength and durability, and
uses recycled polyurethane chips to provide elasticity and permeability suitable for
sports activities, walking, outdoor exercises and the like.

Documents:

00853-kol-2004-abstract.pdf

00853-kol-2004-claims.pdf

00853-kol-2004-correspondence.pdf

00853-kol-2004-description (complete).pdf

00853-kol-2004-form 1.pdf

00853-kol-2004-form 18.pdf

00853-kol-2004-form 2.pdf

00853-kol-2004-form 3.pdf

00853-kol-2004-form 5.pdf

00853-kol-2004-gpa.pdf

00853-kol-2004-letter patent.pdf

00853-kol-2004-priority document others.pdf

00853-kol-2004-reply f.e.r.pdf

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Patent Number

216374

Indian Patent Application Number

853/KOL/2004

PG Journal Number

11/2008

Publication Date

14-Mar-2008

Grant Date

12-Mar-2008

Date of Filing

24-Dec-2004

Name of Patentee

KANG SUNG SOON

Applicant Address

#304, HOJEONG VILLA, 679 IL WON-DONG, GANGNAM-GU, SEOUL 135-230

Inventors:

#	Inventor's Name	Inventor's Address
1	KANG SUNG SOON	#304, HOJEONG VILLA, 679 IL WON-DONG, GANGNAM-GU, SEOUL 135-230

PCT International Classification Number

E 01 C 7/30, 15/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	2004-7861	2004-02-06	Republic of Korea