Putty powder for interior walls generally has a viscosity of 100,000. The cement mortar has higher requirements for adjustment, and the viscosity of 150,000 is easy to use. In addition, the most critical role of HPMC is to lock water, followed by thickening. In putty powder, if the water retention is good and the viscosity is low (7-80,000), it can also have a higher natural viscosity and relatively better water retention. When the viscosity exceeds 100,000, the viscosity has little effect on water retention.
What is the key effect of HPMC in putty powder, and whether organic chemistry occurs?
HPMC plays three functions of thickening, water retention and construction in putty powder.
Thickening: Methylcellulose can be concentrated with floating, aqueous solutions to maintain uniform and consistent functionality and prevent flow hangs.
Water retention: The interior wall powder dries slowly, and the added calcium lime is reflected in the use of water.
Engineering construction: Methyl cellulose has a lubricating effect, which can make the putty powder have an excellent engineering structure.
HPMC is not involved in all chemical changes but only in supplementation. Putty powder, on the wall, is a chemical change, because there is a new chemical substance transformation, the putty powder comes out of the wall, grinds out the powder, and reuses because a new chemical substance (calcium carbonate) has been produced.
The main components of calcium fly ash are: Ca(oh)2, Cao and a small amount of Caco3 compounds, Caoh2oCa(oh)2-Ca(oh)2caco3h2o lime can be converted into calcium bicarbonate in water and gas, while mpc is only water soluble Calcium fly ash is a stronger reflection, which itself does not participate in any reflection.
What should be paid attention to in the actual application of the relationship between the viscosity and temperature of HPMC?
The viscosity of HPMC is inversely proportional to temperature, in other words, viscosity increases with decreasing temperature. The viscosity of the product, the viscosity of the product means that its 2% solution is at a temperature of 20 degrees Celsius, and the test results.
In specific applications, attention should be paid to areas with large temperature differences between summer and winter, and it is strongly recommended to use a lower viscosity in winter. Otherwise, the viscosity is low, the viscosity of the cellulose will increase, and the scratches will be heavy.
Medium viscosity: 75000-100000 suitable for putty powder
Reason: good water retention
High viscosity: 150000-200000 is suitable for polystyrene particle insulation mortar and inorganic insulation mortar.
Reasons: high viscosity, difficult removal of cement mortar, loss of gloss, improved construction.