Hydroxypropyl methyl cellulose in cement mortar and gypsum-based slurry mainly plays a role of water retention and thickening, which can effectively improve the cohesive force and sag resistance of the mortar.
Factors such as air temperature, temperature and wind pressure speed will affect the volatilization rate of water in cement mortar and gypsum-based products. Therefore, in different seasons, there are some differences in the water retention effect of the same amount of hydroxypropyl methylcellulose. In the specific construction, the water retention effect of the slurry can be adjusted by increasing or decreasing the amount of HPMC’s dosage. The water retention of methyl cellulose ether under high temperature conditions 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 at high temperatures. In 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 the slurry. High-quality HPMC has 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 the free water becomes bound water, thereby effectively controlling the evaporation of water caused by high temperature weather, and achieving high water retention.
High-quality hydroxypropyl methylcellulose can be uniformly and effectively dispersed in cement mortar and gypsum-based products, and wrap all solid particles, and form a layer of wetting film, the water in the base is gradually released over a long period of time , And the hydration reaction occurs with the inorganic cementitious material, so as to ensure the bonding strength and compressive strength of the material.
Therefore, in the high-temperature summer construction, in order to achieve the effect of water retention, high-quality HPMC products must be added in sufficient quantities according to the formula, otherwise, insufficient hydration, reduced strength, cracking, hollowing and falling off will occur due to excessive drying. Problems, but also increase the difficulty of construction workers. As the temperature decreases, the amount of HPMC added can be gradually reduced, and the same water retention effect can be achieved.
LONGOU’s MODCELL HPMC Hydroxypropyl methyl cellulose HPMC LK75M is multifunctional additive for ready-mixes and dry-mix products. It is a high efficient water retention agent, thickener, stabilizer, adhesive, film-forming agent in building materials.
Different grades are available. Our professional technical engineer can also customize products according to users’ requirements in application.
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Post time: Aug-05-2021