In the putty powder, it plays three roles of thickening, water retention and construction.
Thickening: Cellulose can be thickened to suspend and keep the solution uniform up and down, and resist sagging.
Water retention: Make the putty powder dry slowly to assist the ash calcium to react under the action of water.
Construction: Cellulose has a lubricating effect, which can make the putty powder have good construction.
Safe production is more important than Mount Tai
HPMC does not participate in any chemical reactions, but only plays an auxiliary role. Adding water to the putty powder and putting it on the wall is a chemical reaction, because new substances are formed. Get the putty powder on the wall off the wall, grind it into powder, and use it again. It will not work because new substances (calcium carbonate) have been formed. Yes. The main components of ash calcium powder are: a mixture of Ca(OH2, CaO and a small amount of CaCO3, CaO+H2O=Ca(OH2-Ca(OH2+CO2==CaCO3↓+H2O The effect of ash calcium on CO2 in water and air Under this condition, calcium carbonate is generated, while HPMC only retains water and assists the better reaction of ash calcium, and does not participate in any reaction itself.
The powder loss of putty powder is mainly related to the quality of ash calcium, and has little to do with HPMC. The low calcium content of gray calcium and the improper ratio of CaO and Ca(OH2 in gray calcium will cause powder loss. If it has something to do with HPMC, then the poor water retention of HPMC will also cause powder loss.
Post time: Apr-23-2023