Title of Invention	A DECORATIVE PLASTER COATING
Abstract	A decorative plaster coating comprising of 12-15% by wt. of ordinary porland cement, 80-85% by wt. of marble dust, 2-4% by wt. of soap stone powder, 0.5-1% by wt. of colour pigment such as cement colour, 1-2% by wt. of DDL such as fevicol.

Full Text

FIELD OF INVENTION The present invention relates to a decorative plaster coating. PRIOR ART In marble mining and processing, while marble blocks are cut by gang saws, water is used as coolent. The blade thickness of the saws is about 5mm and normally the blocks are cut in 20mm thick sheets. Therefore, out of every 25mm thickness of marble block, 5mm sizes are converted into powder while cutting. This powder flows along with the water as marble slurry containing 35-40% water content. Nearly 20% of the total marble processed is converted into marble slurry. In India, the marble cutting industries are mostly in the state of Rajasthan, where the marble slurry generally is being dumped along the roadsides and in agricultural land. This slurry on drying up causes environmental hazards and contaminates the underground water reserves. Presently nearly 0.6 million tones of marble slurry is generated. annually and the amount is likely to increase in near future. There is a huge accumulation of marble dust as a waste material. Conventional plaster coatings based on lime wash, cement paints and resins offer decorative look with varying degree of water proofing. However, these coating surfaces usually undergo weather-induced deterioration due to chemical and physical changes that lead to chipping, peeling off and development of shrinkage cracks. Therefore, considering the problems associated in generation and accumulation of marble slurry including the disadvantages associated with the conventional plaster coatings, studies have been carried out for utilization of marble slurry/dust in the development of building products such as plaster coatings applicable on the plaster wall surface with marble like finish. The development of such product and its manufacturing technology will result in conservation of high grade/natural materials besides solving the problem of environmental hazards. OBJECT OF THE PRESENT INVENTION The main object of the present invention is to propose a decorative plaster coating with marble look and a process for preparation thereof. Another object of the present invention is to propose a decorative plaster coating with marble look and a process for preparation thereof which results in conservation of high grade/natural materials. Further object of the present invention is to propose a decorative plaster coating with marble look and a process for preparation thereof which avoids environmental hazards. Yet further object of the present invention is to propose a decorative plaster coating with marble look and a process for preparation thereof which is economical. Yet further object of the present invention is to propose a decorative plaster coating with marble look and a process for preparation thereof which overcomes the disadvantages of prior art.STATEMENT OF THE INVENTION According to this invention there is provided a decorative plaster coating comprising of 12-15% by wt of ordinary porland cement, 80-85% by wt of marble dust, 2-4% by wt of soap stone powder, 0.5-1% by wt of cement colour, 1-2% by wt of DDL such as fevicol. Further according to this invention there is provided a process for the preparation of a decorative plaster coating comprises blending of ordinary porland cement, marble dust and soap stone powder, in a pan mixer to obtain a dry mix followed by preparation of workable paste by adding DDL adhesive such as fevicol and water with dry mix to obtain the plaster coating. DETAILED DESCRIPTION OF THE INVENTION CHARACTERIZATION OF RAW MATERIAL (MARBLE SLURRY/DUST SAMPLES). The main raw material used is marble slurry/dust sample. Different samples of marble slurry/dust samples (MS-1 to MS-5) can be collected from Udaipur and Makrana-Kishangard Clusters in the state of Rajasthan and are subjected to chemico-mineralogical and physical characterization. The sieve analysis of marble dust samples indicates presence of particles below 212 micron and the major size fraction are -90+63, -63+45 and -45 micron. The percentage of size fraction used in the sample is given below. +90 micron : 4-5% -90+63 micron : 20-32% -63+45 micron : 32-42% -45 micron : 23-36% However, the particle size distribution of -45 micron sieve fraction shows the predominance of finer particles fractions. The physical properties of marble dust samples indicate the values of bulk density, 1.3-1.5 gm/cc and specific gravity 2.83-2.87. The moisture in the different marble slurry samples is found to be in the range of 35-40%. The chemical analysis of the oven dried dust samples as given in Table 1, indicates high variation in oxides constituent such as Si02 : 4.86-12.65%, MgO : 7.98-20.20% and CaO 29.40-39.88% respectively. Table 1: Chemical Analysis of Marble Dust Samples (TABLE REMOVED) The mineral phase compositions of these samples as determined by XRD technique indicate the presence of dolomite, calcite, cx-quartz and minerals of feldspar group. The physio-chemico and mineralogical characteristics of the marble slurry/dust have been found appropriate for its utilization in development of cement based building products. Accordingly formulation are designed for different plaster coating using upto 85% weight proportion of the marble dust in the blends containing marble dust, cement and additives. There is provided a decorative plaster coating with marble look in which upto 85% marble dust (by wt.) can be utilized in the blends containing hydraulic binder upto 15% of ope and small amount of additives such as soap stone, colouring pigments, and DDL adhesive such as fevicol. The decorative plaster coating comprises 12-15% by wt. Of ordinary porland cement (ope), 80-85% by wt. Of marble dust, 2-4% by wt. Of soap stone powder, 0.5-1% by wt. of colour pigment (any colour) and 1-2% by wt. of fevicol (DDL). A dry composite mix of all the above mentioned raw materials is prepared by blending in a pan mixer for 15-20 minutes. Workable paste is prepared upto 20% water under optimized conditions and evaluated for setting and hardening characterisits. Size gradation and particle size distribution of the marble dust sample SIZE GRADATION (TABLE REMOVED) PSD of -45 micron size fraction sample (TABLE REMOVED) The paste or putty of the composite mixes has sufficient time to set for application on masony plaster surface by hand using putty blade. After applying paste as thin layer, it is allowed to set for 30-40 minutes and harden for 2-3 hours. During setting, the coating surface is made even using the metallic blade. Subsequently the coated layer is polished. Colouring pigments can also be used as per the requirement during setting and before polishing by touching with the help of brush for the purpose of texture and designing. Polishing of the coating surface results in smooth and shining surface, which has the advantage of water repellence owning to surface gloss. Also, the effects of the corrosive elements are reduced, which leads to improved durability. The hardness of the hardened coating thus developed is found to be ~5 on Moh's scale. The coating exposed to extreme climatic temperature and humidity conditions do not show any deterioration and adverse effect. EXAMPLE For the preparation of 100 gm of decorative plaster coating, 15 gm of ordinary portland cement (white/grey), 83 gm of marble dust and 2 gm of soap stone powder are taken. The mixture is blended in a pan mixer. The dry mix thus obtained is added with 1.5 ml of fevicol and 20 ml of water to make a paste. Any colour pigment can be added in the mix in the amount of 0.75 gm by replacing equal amount of marble dust. The paste thus prepared can be applied on the wall. It is to be noted that the present invention is susceptible modifications, adaptations and changes by those skilled in the art. Such variant embodiments employing the concepts and features of this invention are intended to be within the scope of the present invention, which is further set forth under the following claims:- WE CLAIM; 1. A decorative plaster coating comprising of 12-15% by wt. of ordinary porland cement, 80-85% by wt. of marble dust, 2-4% by wt. of soap stone powder, 0.5-1% by wt. of colour pigment such as cement colour, 1-2% by wt. of DDL such as fevicol. 2. A decorative plaster coating as claimd in claim 1, wherein colour pigment is added by replacing equal amount of marble dust. 3. A decorative plaster coating as claimed in claim 1, wherein the preparation of decorative plaster coating comprises blending of ordinary porland cement, marble dust and soap stone powder, in a pan mixer to obtain a dry mix followed by adding fevicol and water to obtain the plaster coating.

Documents:

2202-DEL-2004-Abstract-(02-12-2010).pdf

2202-DEL-2004-Abstract-(21-02-2012).pdf

2202-del-2004-abstract.pdf

2202-DEL-2004-Claims-(02-12-2010).pdf

2202-DEL-2004-Claims-(21-02-2012).pdf

2202-del-2004-claims.pdf

2202-DEL-2004-Correspondence Others-(21-02-2012).pdf

2202-DEL-2004-Correspondence-Others-(02-12-2010).pdf

2202-del-2004-correspondence-others.pdf

2202-del-2004-correspondence-po.pdf

2202-DEL-2004-Description (Complete)-(02-12-2010).pdf

2202-DEL-2004-Description (Complete)-(21-02-2012).pdf

2202-del-2004-description (complete).pdf

2202-DEL-2004-Form-1-(02-12-2010).pdf

2202-DEL-2004-Form-1-(21-02-2012).pdf

2202-del-2004-form-1.pdf

2202-del-2004-form-18.pdf

2202-DEL-2004-Form-2-(02-12-2010).pdf

2202-DEL-2004-Form-2-(21-02-2012).pdf

2202-del-2004-form-2.pdf

2202-DEL-2004-Form-3-(02-12-2010).pdf

2202-DEL-2004-GPA-(02-12-2010).pdf