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In cement mortar and gypsum-based mortar, HPMC mainly plays the role of water retention and thickening, and can effectively improve the cohesion and sag resistance of the mortar. Factors such as air temperature, temperature, and wind pressure will affect the evaporation rate of water in cement mortar and gypsum-based products. Therefore, in different seasons, there are some differences in the water retention effect of products with the same amount of HPMC added.
The water retention effect at high temperatures is an important indicator to distinguish the quality of HPMC. Excellent HPMC products can effectively solve the problem of water retention under high temperatures. In the high-temperature seasons, especially in hot and dry areas and thin-layer construction on the sunny side, high-quality HPMC is required to improve the water retention of mortar.
, with very good uniformity, its methoxy, and hydroxypropoxy groups are evenly distributed along the cellulose molecular chain, which can improve the ability of the oxygen atoms on the hydroxyl and ether bonds to associate with water to form hydrogen bonds so that free water becomes bound water, to effectively control the evaporation of water caused by high-temperature weather and achieve high water retention.
High-quality HPMC can be uniformly and effectively dispersed in cement mortar and gypsum-based products, encapsulates all solid particles, forms a wetting film, and the moisture in the base is gradually released over a long period. The hydration reaction of the coagulating material occurs, thereby ensuring the bonding strength and compressive strength of the material.
MilaCell HPMC (Hydroxypropyl Methyl Cellulose) is the one mortar factory chooses, it substantially reduces the loss of water when applied to water absorbing materials, especially in high temperature environments.
Under construction in high-temperature summer, in order to achieve the effect of water retention, it is necessary to add high-quality HPMC in sufficient quantities according to the formula, otherwise, there will be insufficient hydration, strength reduction, cracking, hollowing, and falling off caused by too fast drying. At the same time, it also increases the difficulty of construction for workers. As the temperature decreases, the additional amount of HPMC can be gradually reduced and assured to achieve the same water retention effect.