Effect and principle of Hydroxypropyl Methyl Cellulose on Water retention

In cement mortar and gypsum-based slurry, hydroxypropyl methyl cellulose (HPC) plays an important role in water retention and thickening, which can effectively improve the adhesion and anti-sagging properties of the slurry.

Factors such as air temperature, temperature and wind pressure can affect the evaporation rate of water in cement mortar and gypsum-based products. Therefore, in different seasons, the water retention effect of the product of the same amount of the hydroxypropyl methyl cellulose is different. In the concrete construction, the water-retaining effect of the slurry can be adjusted by increasing or decreasing the addition amount of the HPMC. The water retention of methyl cellulose ether under high temperature is an important index to distinguish the quality of methyl cellulose ether（http://www.hnhbsj.com）.

The excellent hydroxypropyl methyl cellulose series product can effectively solve the problem of water retention at high temperature. The high-quality HPMC is required to improve the water-retaining property of the slurry during the high-temperature season, especially in the hot and dry areas and the thin-layer construction to the male surface. The high-quality HPMC is excellent in uniformity, and the methoxy and hydroxypropyloxy groups of the HPMC are uniformly distributed along the chain of the cellulose molecules, and the ability of the oxygen atoms on the hydroxyl groups and the ether bonds to associate with water to form hydrogen bonds is improved, and the free water is changed into binding water, So that the water evaporation caused by the high-temperature weather can be effectively controlled, and the high water-retention property is achieved.

the high-quality hydroxypropyl methyl cellulose can be uniformly and effectively dispersed in the cement mortar and the gypsum-based product, So as to ensure the bonding strength and the compressive strength of the material.

Therefore, in the high temperature summer construction, in order to achieve the effect of water preservation, high-quality HPMC products should be added according to the formula, otherwise, there will be some quality problems such as insufficient hydration, low strength, cracking, hollowing and shedding caused by excessive drying. At the same time, workers also increase the difficulty of construction. With the decrease of temperature, the addition of HPMC can be reduced gradually, and the same water retention effect can be achieved.

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