How to judge hydroxypropyl methylcellulose from water retention

From the water retention of hydroxypropyl methyl cellulose, it can distinguish the advantages and disadvantages of hydroxypropyl methyl cellulose. The water retention of methyl cellulose ethers under high temperature conditions is the key objective for different quality of methyl cellulose ethers. Factors such as gas temperature, temperature and wind pressure speed will affect the volatilization rate of water in cement mortar and gypsum-based products. Therefore, in different seasons, the water retention function of the product with the same amount of hydroxypropyl methylcellulose is a little different.

In the specific construction site, the amount of hydroxypropyl methylcellulose can be adjusted to adjust the water retention function of the slurry. Excellent hydroxypropyl methylcellulose products can effectively deal with water retention problems at high temperatures. In high-temperature seasons, especially in hot, dry and boring areas and thin-layer construction on the sunny side, high-quality hydroxypropyl methylcellulose is required to develop the water retention of the slurry.

High-quality hydroxypropyl methyl cellulose has good uniformity. Its methoxy and hydroxypropoxy groups are evenly distributed along the cellulose molecular chain. It can develop hydroxyl and ether bonds with oxygen atoms and The ability of water to associate to form a hydrogen bond turns free water into bound water, and effectively manipulates the water transpiration caused by high temperature climate to achieve high water retention.

High-quality hydroxypropyl methylcellulose can be uniformly and usefully dispersed in cement mortar and gypsum-based products, and encapsulate any solid particles, and form a layer of moist film, the water in the base gradually gradually When released, it hydrates with the inorganic cementing material and ensures the bonding strength and compressive strength of the material.

Therefore, in the high temperature summer construction site, in order to achieve the water retention function, it is necessary to fill in the high-quality hydroxypropyl methyl cellulose product in sufficient quantity according to the formula, otherwise, it will be boring and too fast, resulting in insufficient hydration and reduced strength Quality problems such as, cracking, hollowing and falling are also difficult to fill and process. As the temperature drops, the amount of hydroxypropyl methylcellulose can be gradually reduced, and the same water retention function can be achieved.