Today we will lead you to understand the role of hydroxypropyl methylcellulose in putty powder. Generally speaking, it has three major functions: thickening, water retention and construction.
Thickening: It can thicken the cellulose suspension, keep the solution uniform up and down, and prevent sagging.
Water: Make the putty powder drier and assist calcium to react under the action of water.
Construction method: Cellulose has a lubricating effect, and the putty powder can be placed for construction.
Hydroxypropyl methylcellulose HPMC does not participate in any chemical reaction and only plays a secondary role. Putty powder adds water, on the wall, it is a chemical reaction, because there is a new material generation, put the putty powder on the wall down from the wall, pulverize it into powder, and then die because a new substance (calcium carbonate) is formed . CaO+H2O=Ca(OH)2-Ca(OH)2+CO2=CaCO3↓+H2O as the main component of Ca(OH)2, CaO and CaCO3 in water and CO2 in air, form calcium carbonate and HPMC only Water, which assists calcium to respond better to calcium, itself does not involve any antioxidants, as it should.
Putty powder can generally be 100,000, and mortar requirements are higher, and it can be used to 150,000. In addition, the most important role of hydroxypropyl methylcellulose HPMC is water retention and subsequent thickening. In putty powder, as long as the water retention is good and the viscosity is low (70,000-80,000), it is also feasible. Of course, the higher the viscosity, the better the relative water-retention. When the viscosity exceeds 100,000, the viscosity has little effect on the water retention.