Additives that affect the properties of gypsum


The application of adhesives in gypsum dry-mixed building materials is second only to water retaining agents and retarders. Gypsum self-leveling mortar, bonding gypsum, caulking gypsum, and thermal insulation gypsum adhesives are all inseparable from adhesives.
▲ Redispersible latex powder
Redispersible latex powder is widely used in gypsum self-leveling mortar, gypsum thermal insulation adhesive, gypsum caulking putty, etc.
Especially in gypsum self-leveling mortar, it can make the slurry adhesive and fluid, and also plays a great role in reducing stratification, avoiding water seepage, and improving crack resistance. The usage is generally 1.2% to 2.5%.
▲ Instant polyvinyl alcohol
The most commonly used instant polyvinyl alcohol on the market is the two models of 24-88 and 17-88. It is often used in bonding gypsum, gypsum putty, gypsum composite thermal insulation adhesive, plaster and other products. The usage is generally 0.4% to 1.2%. Guar gum, Tianqing gum, carboxymethyl cellulose, starch ether, etc. are adhesives with different bonding functions in gypsum dry-mixed building materials.


Thickening mainly improves the workability and sag of gypsum slurry, which is similar to adhesives and water-retaining agents, but not completely. Some thickener products have good thickening effects, but are not ideal in terms of bonding strength and water retention.
When preparing gypsum dry powder building materials, the main role of admixtures should be fully considered. In order to apply admixtures better and more reasonably. Commonly used thickener products include polyacrylamide, Tianqing gum, guar gum, carboxymethyl cellulose, etc.

07.Air-entraining agent

Air-entraining agent is also called foaming agent, which is mainly used in gypsum dry-mixed building materials such as gypsum thermal insulation adhesive and plaster. Air-entraining agent (foaming agent) helps to improve construction performance, crack resistance, frost resistance, reduce water seepage and segregation, and the dosage is generally 0.01% to 0.02%.


Defoamers are commonly used in gypsum self-leveling mortar and gypsum joint putty. They can improve the density, strength, water resistance and adhesion of the slurry. The dosage is generally 0.02% to 0.04%.