What are the main technical indicators of hydroxypropyl methylcellulose (HPMC)?
The hydroxypropyl content and viscosity, which most users care about are these two indicators. If the hydroxypropyl content is high, the water retention is generally better. Viscosity, water retention, relative (rather than absolute), and high viscosity, better in cement mortar.
What are the main raw materials for hydroxypropyl methylcellulose (HPMC)?
The main raw materials of hydroxypropyl methylcellulose (HPMC): refined cotton, methyl chloride, propylene oxide, other raw materials, such as caustic soda, acid, toluene, isopropanol and the like.
What is the main role of HPMC in putty powder, is it chemical?
In the putty powder, HPMC plays the role of thickening, water retention and construction. Thickening: Cellulose can be thickened to suspend, keep the solution uniform and uniform, and resistant to sagging. Water retention: The putty powder is dried slowly, and the auxiliary ash calcium reacts under the action of water. Construction: Cellulose has a lubricating effect, which can make the putty powder have good workability. HPMC does not participate in any chemical reactions and only plays a supporting role. Putty powder with water, on the wall, is a chemical reaction. Because of the formation of new substances, the putty powder on the wall is removed from the wall, ground into powder, and reused, it will not work, because a new substance has been formed (calcium carbonate). ). The main components of ash calcium powder are: Ca(OH)2, a mixture of CaO and a small amount of CaCO3, CaO+H2O=Ca(OH)2—Ca(OH)2+CO2=CaCO3↓+H2O ash calcium in water and air Under the action of CO2, calcium carbonate is formed, and HPMC only retains water, assists the better reaction of ash calcium, and does not participate in any reaction itself.