Redispersible latex powder improves the crack resistance of putty in the following ways
January 22nd 2025
HPMC plays three roles in the putty powder, including thickening, water retention and construction. Thickening: Cellulose can be thickened to suspend, keep the solution uniform, and resist sagging. Water retention: Make the putty powder dry slowly, and assist the reaction of ash calcium under the action of water. Construction: Cellulose has a lubricating effect, which can make the putty powder have good workability. HPMC does not participate in any chemical reaction and only plays an auxiliary role. Putty powder added to the water wall is a chemical reaction. Because of the formation of new substances, take the putty powder on the wall off the wall, grind it into powder, and then use it again, it will not work, because new substances (calcium carbonate) have been formed. . The main components of ash calcium powder are: a mixture of Ca(OH)2,CaO and a small amount of CaCO3, CaO+H2O=Ca(OH)2—Ca(OH)2+CO2=CaCO3↓+H2O Ash calcium in water and air Under the action of CO2, calcium carbonate is generated, while HPMC only retains water and assists ash calcium to react better. It does not participate in any reaction itself, so the powder drop of putty powder has nothing to do with HPMC.
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