hydroxypropyl methylcellulose HPMC in Plastering MortarFebruary 2nd 2023
In the putty powder, HPMC plays three roles of thickening, water retention and construction. Do not participate in any reaction.
1. Thickening: Cellulose can be thickened to suspend and keep the solution uniform, and resist sag.
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 the wall is chemically reacted. 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) has been formed. Up. 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 The role of gray calcium in water and air CO2 Calcium carbonate is formed under HPMC, while HPMC only retains water and assists the better reaction of gray calcium. It does not participate in any reaction.