HPMC is a common hypromellose additive in dry mortar. Cellulose ether plays an important role in dry mortar, because of the surface activity, the cementitious material is effectively and uniformly distributed in the system, and cellulose ether is a protective colloid, the“Enveloping” of the solid particles and the formation of a lubricant film on their outer surface make the mortar system more stable, and also improve the fluidity of the mortar in the mixing process and the smoothness of the construction. The hypromellose HPMC is water-retaining, preventing moisture from evaporating too early or being absorbed by the base course, ensuring that the cement is fully hydrated, and the mechanical properties of the mortar, which is particularly beneficial for thin-layer mortars and water-absorbent base courses, or mortars constructed under high-temperature drying conditions. The water-retaining effect of hypromellose can change the traditional construction techniques and improve the construction schedule. For example, plastering can be carried out on absorbent substrates without pre-wetting. The viscosity, content, ambient temperature and molecular structure of hypromellose HPMC have a significant impact on its water retention. Under the same conditions, the higher the viscosity of cellulose ether, the better the water-holding capacity. The higher the content of cellulose ether, the better the water-holding capacity. When the content of cellulose ether reaches a certain degree, the water-holding capacity increases slowly. With the increase of environmental temperature, the water-holding capacity of cellulose ether usually decreases, but some modified cellulose ethers also have better water-holding capacity at high temperature. The water-holding capacity of cellulose ethers with lower degree of substitution is better. Our company can provide a hypromellose HPMC water retention method to solve the existing cellulose ether water retention performance is not ideal.
Post time: Oct-30-2023