What is the main function of the application of hydroxypropyl methyl cellulose in putty powder? Is there a chemical reaction?
In the putty powder, it has three functions: thickening, water retention and construction.
Thickening, cellulose can thicken to suspend and keep the solution uniform and consistent, and anti-sagging.
Water retention: make the putty powder dry slowly, and assist the gray calcium to react 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 reaction, only plays a supporting role. Adding water to the putty powder 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 and ground into powder before use. It will not work, because a new substance (calcium carbonate) has been formed. Up. The main components of gray calcium powder are: a mixture of Ca(OH)2, CaO and a small amount of CaCO3, CaO+H2O=Ca(OH)2-Ca(OH)2+CO2=CaCO3↓+H2O gray calcium in water and air Under the action of CO2, calcium carbonate is formed, while HPMC only retains water and assists the better reaction of gray calcium. It does not participate in any reaction.
What is the cause of the smell of hydroxypropyl methylcellulose?
The HPMC produced by the solvent method uses toluene and isopropanol as the solvent. If it is not washed well, it will have some residual smell.
What is the alias for hydroxypropyl methylcellulose?
Hydroxypropyl Methyl Cellulose, English: Hydroxypropyl Methyl Cellulose Abbreviation: HPMC or MHPC Alias: Hypromellose; Cellulose hydroxypropyl methyl ether; Hypromellose, Cellulose, 2-hydroxypropylmethyl Cellulose ether. Cellulose hydroxypropyl methyl ether Hyprolose .
The application of hydroxypropyl methyl cellulose in putty powder, what causes the putty powder to produce bubbles?
In the putty powder, HPMC plays three functions of thickening, water retention and construction. It does not participate in any reaction and causes of bubbles (1) too much water is put, (2) the bottom layer is not dry, just scrape another layer on top Also easy to foam.