Cellulose products are derived from natural cotton pulp or wood pulp, after etherification reaction made. Different cellulose products use different etherators, hydroxyethyl cellulose (HEC) uses ethyl oxide. Hydroxyethyl methylcellulose (HPMC) uses other types of etherators (chloromethane and propylene oxide).
True stone paint because of its large amount of aggregate, more than significant, easy to precipitate. Increase its viscosity, to meet the viscosity needed for construction injection, and achieve a certain strength. For the genuine stone lacquer to achieve good strength, good water resistance and weather resistance, the choice of raw materials and formula design are very important.
Under general circumstances, the emulsion dosage of high-quality real stone paint will be relatively high
For example, a ton of real stone paint, there may be 300kg of pure propylene emulsion and 650kg of natural color stone sand, when the emulsion solid content is 50%, 300kg emulsion after drying volume is about 150 liters, 650kg of sand volume is about 228 liters.That is to say, at this time, the PVC (pigment volume concentration) is 60%, because the particles of the color sand is large, the irregular shape, in a certain particle size distribution conditions, the dry stone paint may be around CPVC (critical pigment volume concentration).In terms of the thickener, if choosing the appropriate viscosity of the cellulose, the true stone lacquer can form a relatively complete and dense lacquer film, to meet the three major performance requirements of the true stone lacquer.
If the content of stone paint emulsion is low. Use higher viscosity cellulose as a thickening agent (such as 100,000 viscosity), especially after the price of cellulose, which can reduce the use of cellulose. But also can make the performance of stone paint better. There are some economical true stone paint manufacturers out of cost and other factors considerations, with hydroxypropyl methyl cellulose instead of hydroxyethyl cellulose. Compared with the two kinds of cellulose, hydroxyethyl cellulose has better water retention. Which will not lose water retention gel at high temperature, and has a certain mildew resistance. For performance reasons, use the 100,000 viscosity of hydroxyethyl cellulose as a thickener for the real stone paint.