Hydroxypropyl methyl cellulose in the putty viscosity of 100,000, mortar viscosity is relatively high, should be applied 150,000. Hydroxypropyl methyl cellulose locks water, followed by thickening. Therefore, in the putty, only do water retention, the viscosity will be lower. Generally speaking, the greater the viscosity, the better the water retention, but when the viscosity exceeds 100,000, the viscosity has little effect on the water retention.
According to the viscosity, decorative building materials grade hydroxypropyl methyl cellulose can be divided into the following types:
- 1.Low viscosity: 400 viscosity cellulose, mainly used in cement artesian leveling mortar. Low viscosity, good liquidity, after the addition, manipulate the surface layer of water lock, no significant bleeding rate, small closing, reduce cracking, deposition resistance, improve liquidity and pump.
- 2. Low and medium viscosity: 2,000-50,000 viscous cellulose, mainly used in gypsum products and sealant. Low viscosity, high water retention, good ease, less water flow.
- 3. Medium viscosity: for 75,000-10,000 viscosity hydroxypropyl methyl cellulose, mainly used in the internal and external wall putty. Moderate viscosity, good water retention, strong hanging.
- 4. High viscosity: 150,000-200,000, mainly used in polystyrene resin thermal insulation insulation mortar resin rubber powder and glass chemical micro bead thermal insulation mortar.
High viscosity, high water retention, mortar is not easy to fall down the dents, and then improve the engineering construction. In general, the greater the viscosity of hydroxypropyl methylcellulose, the better the water retention. Therefore, many customers will choose to use low medium viscosity cellulose (75,000-10,000-yuan) to replace low medium viscosity cellulose (20,000-50,000 yuan), in order to reduce the plus amount and save costs.
Hydroxypropyl methyl cellulose viscosity controllability, different viscosity for different building decoration materials, such as inner wall putty powder 100000 viscosity, beyond viscosity must add other auxiliary, mortar viscosity in 150000, cement leveling generally in 400 viscosity, many companies viscosity on the market, the higher the price is actually a wrong misunderstanding, less than 40000 small viscosity processing process will be tedious some price will be a little more expensive.