The viscosity of hydroxypropyl methylcellulose (HPMC) for degreasing coating?

A: The degreasing layer can generally be HPMC 100000cps, in mortar requires higher, to 1500000cps to use. Moreover, the most important role of HPMC is to retain water, followed by thickening. In Skim coat, as long as the water retention is good, low viscosity (7-80000) is also possible, of course, the greater the viscosity, the better the relative water retention, when the viscosity exceeds 100 when thousand, water retention viscosity is not great.

HPMC in the application of degreasing coating, what is the main role, is it a chemical substance?

A: HPMC has three roles in degreasing agent, thickening, waterproofing and construction. HPMC has three roles in degreasing agent, thickening, waterproofing and construction. Thickening: It can thicken cellulose into suspension, keep the solution evenly up and down, and play the role of anti-sagging. Water retention: It makes the degreaser dry slowly and assists the reaction of calcium ash in water. Construction: The lubricating effect of cellulose can make the degreasing coat with good construction. HPMC does not participate in any chemical reaction and only plays an auxiliary role. The degreasing agent and water, on the wall, are chemically reacted, because a new substance is produced. It is not effective to take the degreasing agent off the wall, grind it into powder and use it again because a new substance (calcium carbonate) has been formed. The main component of calcium ash powder is. Ca(OH)2, CaO and a small amount of CaCO3 mixture, CaO + H2O = Ca(OH)2 - Ca(OH)2 + CO2 = CaCO3↓ + H2O calcium ash in the action of water and CO2 in the air, the formation of calcium carbonate, while HPMC only water, to assist the better reaction of calcium ash, which itself is not involved in any reaction.

The application of HPMC in Skim coat, what is the cause of blistering in the Skim coat?

A: HPMC is used in three aspects of degreasing, thickening, water retention and construction. It is not involved in any reaction. Reasons for bubbles: 1, too much water. 2, the bottom is not dry, the top scraping a layer, but also easy to blister.