What is the main role of HPMC in the application of putty powder? Does a chemical reaction occur?

What is the main role of HPMC in the application of putty powder? Does a chemical reaction occur?

HPMC plays three roles in the putty powder: thickening, water retention and construction.

1) Thickening: Cellulose can be thickened to suspend, keep the solution uniform, and resist sagging.

2) Water retention: make the putty powder dry slowly, and assist the gray calcium to react under the action of water.

3) Construction: Cellulose has a lubricating effect, which can make the putty powder have good construction properties.

HPMC does not participate in any chemical reaction, only plays a supporting role. The putty powder is added with water and applied to the wall. It is a chemical reaction. Because of the formation of new substances, the putty powder on the wall is removed from the wall and ground into powder. Then it will not work, because a new substance (calcium carbonate) ) Again. The main components of gray 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 gray calcium in water and air Under the action of medium CO2, calcium carbonate is formed, while HPMC only retains water and assists the better reaction of gray calcium, and it does not participate in any reaction.