Adding hydroxypropyl methylcellulose to make putty powder, its viscosity is not easy to be too large, too large will cause poor workability, so how much viscosity does hydroxypropyl methylcellulose for putty powder need?
It is best to add hydroxypropyl methylcellulose to the putty powder with a viscosity of 10 or 75,000, which can improve the workability of the putty powder, and its water retention is also very good. If it is used for mortar, it needs a slightly higher viscosity, such as 150,000 or 200,000 viscosity. Generally, hydroxypropyl methylcellulose has better water retention with higher viscosity.
What is the use of adding hydroxypropyl methylcellulose to putty powder? What is the main role?
HPMC is used in putty powder to thicken, retain water and improve construction performance. Thickening: cellulose can thicken to suspend, keep the solution uniform and consistent, and resist sagging. Water retention: make the putty powder dry slowly, and assist the ash calcium to react under the action of water. Construction: Cellulose has a lubricating effect, which can make the putty powder have good construction.
Hydroxypropyl methylcellulose does not participate in any chemical reaction in putty, it only plays an auxiliary role, and it is colorless and non-toxic. It is the most commonly used additive in modern buildings and is widely used in putty mortar