Hydroxypropyl methyl cellulose (HPMC) in putty
powder (Spackle), the starting thickening, water and construction of three roles.
Thickening: cellulose thickener can play a suspension, the solution was to maintain a
uniform consistency up and down the role of anti-sagging.
Water retention: make putty powder dry slower, secondary ash calcium reaction under the action
of water. Construction: Cellulose lubricating effect,
can make putty powder has good workability. HPMC does not participate in any chemical
reaction, only play a supporting role. Putty powder, add water, on the wall, is a chemical
reaction, because there is a new generation material, put on the wall to get down from
the wall putty powder, ground into powder, then, would not be, as it has been the formation
of new substances (calcium carbonate ) a. Sierozem main ingredient is: (OH) 2, CaO mixture
of Ca and a small amount of CaCO3, CaO H2O=Ca (OH) 2-Ca (OH) 2 CO2=CaCO3 ↓ H2O
ash calcium CO2 in water and air and the action under produce calcium carbonate, and HPMC
is water retention, ash calcium auxiliary better response, which itself did not participate
in any reaction