How does hpmc quality affect mortar quality?

In ready-mixed mortar, the addition amount of HPMC is very low, but it can significantly improve the performance of wet mortar and is a major additive that affects the construction performance of mortar. Reasonable selection of cellulose ethers of different varieties, different viscosities, different particle sizes, different viscosity degrees and added amounts will have a positive impact on improving the performance of dry mortar.

At present, many masonry and plastering mortars have poor water retention properties, and the water slurry will separate after leaving it alone for a few minutes. Water retention is an important performance of methylcellulose ether, and it is also a performance that many domestic dry mortar manufacturers, especially those in southern areas with higher temperatures, focus on. Factors that affect the water retention effect of dry mortar include the amount of MC added, MC viscosity, particle fineness and the temperature of the use environment.

Generally speaking, the higher the viscosity, the better the water retention effect. However, the higher the viscosity and the higher the molecular weight of MC, its solubility will be reduced accordingly, which will have a negative impact on the strength and construction performance of the mortar. The higher the viscosity, the more obvious the thickening effect on the mortar, but the relationship is not directly proportional. The higher the viscosity, the stickier the wet mortar will be, which will manifest itself as sticky scrapers and high adhesion to the substrate during construction. But it does not help much to increase the structural strength of the wet mortar itself. During construction, the anti-sag performance is not obvious. On the contrary, some modified methylcellulose ethers with medium and low viscosity have excellent performance in improving the structural strength of wet mortar.