How HPMC works in wall putty

HPMC plays three roles in putty powder: thickening, water retention and construction. Thickening: the cellulose thickens the putty and helps to suspend it, to keep the solution even and consistent, and to resist sagging. Water retention: It makes the putty powder dry more slowly and assists in the reaction of calcium grey under the action of water. Construction: Cellulose has a lubricating effect and allows the putty powder to work well; HPMC is not involved in any chemical reaction and only plays an auxiliary role. Putty powder with water, on the wall, is a chemical reaction because a new substance is created. Getting the putty powder off the wall, grinding it into powder and using it again, does not work because a new substance (calcium carbonate) has been formed. The main components of calcium grey powder are: Ca(OH)2, CaO and a small amount of CaCO3 mixture, CaO H2O=Ca(OH)2 -Ca(OH)2 CO2=CaCO3↓ H2O Calcium grey generates calcium carbonate under the action of water and CO2 in the air, while HPMC only retains water and assists calcium grey to react better, it itself is not involved in It is not involved in any reaction.