HPMC Hydroxypropyl methyl cellulose in cement mortar and gypsum slurry, mainly play the role of water retention and thickening, can effectively improve the adhesion and sag resistance of slurry.
Air temperature, temperature and wind pressure rate can affect the evaporation rate of water in cement mortar and gypsum based products. So in different seasons, adding hydroxypropyl methyl cellulose the same amount of product water retention effect has some differences. In the concrete construction, the water retention effect of slurry can be adjusted by increasing or decreasing the amount of HPMC. The water retention of methyl cellulose ether at high temperature is an important indicator to distinguish the quality of methyl cellulose ether.
Excellent hydroxypropyl methyl cellulose series products can effectively solve the problem of water retention under high temperature. In the high temperature season, especially in hot and dry areas and thin layer construction on the sunny side, the need for high quality HPMC to improve the water retention of slurry; hydroxypropyl methyl cellulose (HPMC), uniformity is very good, it’s a oxygen and oxygen hydroxypropyl groups evenly distributed along the cellulose chain, can improve the hydroxyl and ether oxygen and water on the key associating form hydrogen bonding ability, make free water of hydration, so as to effectively control the hot weather caused by the moisture to evaporate, Achieve high water retention.
High quality of hydroxypropyl methyl cellulose can uniformly and effectively disperse in cement mortar and plaster products, and package all solid particles, and form a layer of wetting film, the moisture in the base for a long time gradually released, and inorganic cementitious material hydration reaction, so as to ensure the bond strength and compressive strength of materials.
In the construction, in order to achieve the effect of water conservation, need to add high quality HPMC products in accordance with the formula, otherwise, there will be drying too fast caused by insufficient hydration, strength reduction, cracking, hollow drum and shedding quality problems, but also increase the difficulty of workers construction. As the temperature decreases, the amount of water HPMC can be gradually reduced, and the same water retention effect can be achieved.