With the use and understanding of hydroxypropyl methylcellulose (hpmc), I believe many friends know that putty powder will basically be added to it now. Today we need to understand the role of putty powder using hydroxypropyl methylcellulose.
Thickening: Can be thickened and suspended to make the solution uniform and anti-sagging.
Water retention: Putty powder dries slowly and assists calcium and calcium to react under the action of water.
Improve processability: Because the product has a lubricating effect, it can make the putty powder have a good structure. It does not participate in any chemical reaction, only plays an auxiliary role. Putty powder can add water to the wall. This is a chemical reaction. Due to the formation of a new substance, put putty powder on the wall of the wall, grind it into a powder, and then use it because it has formed a new substance (calcium carbonate). )) The main components of gray calcium powder are: Ca(OH)2, a mixture of CaO and a small amount of CaCO3, CaO + H2O = Ca(OH)2-Ca(OH)2 + CO2 = CaCO3 + carbon dioxide in water and air to form carbonic acid The effect of calcium, and HPMC is only to retain water and help gray calcium to respond better. It has not participated in any reaction itself.