Construction Rdp Powder Used in Construction MortarFebruary 26th 2024
The function of HPMC used in wall putty main include thickening, water retention and workability.
1) Thickening: cellulose can be thickened to suspension, so that the solution remains uniform up and down and anti-flow hanging.
2) Water retention: make putty powder dry slowly, auxiliary gray calcium in the action of water reaction.
3) Workability: cellulose lubrication, can make putty powder has good workability. HPMC does not participate in any chemical reactions, but only plays a supporting role.
When wall putty powder and water, on the wall, is a chemical reaction, because of the generation of new substances, the wall putty powder down from the wall, ground into powder, and then use, not workable, because it has formed a new substance (calcium carbonate) during this period.The main components of grey calcium powder are:Ca(OH)2, CaO and a small amount of CaCO3 mixture.CaO+H2O=Ca(OH)2 – Ca(OH)2+CO2=CaCO3↓+H2O gray calcium in water and air under the action of CO2, the formation of calcium carbonate, and HPMC only water, auxiliary gray calcium better reaction, its own did not participate in any reaction.