How to judge hydroxypropyl methylcellulose from water retention

From the water retention of hydroxypropyl methylcellulose, the quality of hydroxypropyl methylcellulose can be distinguished. The water retention of methyl cellulose ether at high temperature is an important goal to distinguish the quality of methyl cellulose ether. Factors such as air temperature, temperature and wind pressure will affect the volatilization rate of water in cement mortar and gypsum-based commodities. Therefore, in different seasons, there are some differences in the water retention effect of the same amount of hydroxypropyl methylcellulose added.

       In the detailed construction, the water retention effect of the slurry can be adjusted by increasing or decreasing the amount of hydroxypropyl methylcellulose added. Hydroxypropyl methylcellulose series products can effectively solve the problem of water retention at high temperature. In high temperature seasons, especially in hot and dry areas and thin-layer construction on the sunny side, high-quality hydroxypropyl methylcellulose is required to improve the water retention of the pulp.

       The homogeneity of high-quality hydroxypropyl methylcellulose is very good, its methoxy and hydroxypropoxy groups are evenly distributed along the cellulose molecular chain, and it can improve the oxygen atoms on the hydroxyl and ether bonds to interact with The ability of water to form hydrogen bonds turns free water into bound water, and then effectively controls the evaporation of water caused by high temperature climates to achieve high water retention.

       High-quality hydroxypropyl methylcellulose can be dispersed evenly and effectively in cement mortar and gypsum-based products, and wraps all solid particles, and forms a moist film, and the moisture in the base is gradually released for a long time. A hydration reaction occurs with the inorganic cementitious material, thereby ensuring the bond strength and compressive strength of the material. Therefore, in high-temperature summer construction, in order to achieve water retention, it is necessary to add high-quality hydroxypropyl methyl cellulose products in sufficient quantities according to the formula, otherwise, it will appear too fast and cause insufficient hydration, strength reduction, and cracking. Quality problems such as empty drums and drops also increase the difficulty of construction by workers. As the temperature drops, the addition amount of hydroxypropyl methylcellulose can be gradually reduced, and the same water retention effect can be achieved.