HPMC for dry mixed ready mixed mortar

In dry mixed ready mixed mortar, the addition of hpmc is very low, but it can improve the performance of wet mortar. The reasonable selection of different varieties, different viscosities, different particle sizes, different viscosities and different amounts of cellulose ethers has an impact on the improvement of the performance of dry powder mortar. At present, many masonry and plastering mortars have poor water retention performance, and water slurry separation will occur after a few minutes of standing. Water retention is an important performance of methyl cellulose ether, and it is also the performance concerned by many domestic dry powder mortar manufacturers, especially those in the regions with high temperature in the south. The factors affecting the water retention effect of dry powder mortar include the amount of hpmc added, the viscosity of hpmc, the fineness of particles and the temperature of the use environment. Hpmc is a kind of synthetic polymer, which is made from natural cellulose by chemical modification.

The important role of water-soluble cellulose ether in mortar mainly includes three aspects: excellent water retention capacity, influence on mortar consistency and thixotropy, and interaction with cement. The water retention effect of cellulose ether depends on the water absorption of the base course, the composition of the mortar, the thickness of the mortar layer, the water demand of the mortar, and the setting time of the setting material. The water retention of cellulose ether itself comes from the solubility and dehydration of cellulose ether itself.

To sum up, HPMC plays a role in keeping water, thickening, delaying cement hydration power and improving construction performance in dry mixed ready mixed mortar. Good water retention capacity makes cement hydration more complete, which can improve the wet viscosity of wet mortar, improve the bonding strength of mortar, and adjust the time. The construction performance and structural strength of dry mixed ready mixed mortar can be improved by adding hydroxypropyl methyl cellulose ether. Therefore, cellulose ether is widely used as an important additive in dry mixed ready mixed mortar.