The application of adhesives in gypsum dry-mixed building materials is second only to water retaining agents and retarders. Gypsum self-leveling mortar, bonded gypsum, caulking gypsum, and thermal insulation gypsum rubber are all inseparable from adhesives.


▲ Re-dispersible latex powder
The dispersible latex powder is widely used in gypsum self-leveling mortar, gypsum heat-insulating rubber material, gypsum caulking putty and the like. Especially in the gypsum self-leveling mortar, it can make the slurry adhesive and fluid, and also plays a great role in reducing delamination, avoiding bleeding and improving crack resistance. The amount used is generally between 1.2% and 2.5%.


▲ Instant Dissolved Polyvinyl Alcohol
At present, the fast-dissolving polyvinyl alcohol used in the market is a product of 24-88 and 17-88. It is commonly used in bonded gypsum, gypsum putty, gypsum composite thermal insulation rubber, plaster plaster, etc. 0.4% to 1.2%.


Guar gum, turf gum, carboxymethyl cellulose, starch ether, etc. are all adhesives with different bonding functions in gypsum dry-mixed building materials.


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Thickener
Thickening is mainly to improve the workability and sag of gypsum slurry. It has similarities with adhesives and water retaining agents, but it is not complete. Some thickener products have a good effect on thickening, but they are not ideal in terms of adhesion and water retention. In the preparation of gypsum dry powder building materials, the main role of the admixture should be fully considered in order to use the admixture better and more rationally. Commonly used thickener products are polyacrylamide, field green gum, guar gum, carboxymethyl cellulose and the like.


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Air entraining agent
The air entraining agent is also called foaming agent, and is mainly used in gypsum dry-mixing building materials such as gypsum heat insulating rubber compound and plastering plaster. Air entraining agent (foaming agent) helps to improve workability, crack resistance, frost resistance, and reduce bleeding and segregation. The dosage is generally 0.01% to 0.02%.


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Defoamer
Defoaming agent is often used in gypsum self-leveling mortar and gypsum caulking putty, which can improve the compactness, strength, water resistance and cohesiveness of the slurry. The dosage is generally 0.02%-0.04%.


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Water reducing agent
The water reducing agent can improve the gypsum slurry fluidity and the gypsum hardening body strength, and is usually used for gypsum self-leveling mortar and plastering plaster. At present, the domestic water-reducing agent is arranged according to the fluidity and strength effect, and is a polycarboxylic acid retarding water reducing agent, a melamine high-efficiency water reducing agent, a lanthanide high-efficiency retarding water reducing agent, and a lignosulfonate water reducing agent. In the gypsum dry-mixed building materials, the water-reducing agent is used. In addition to considering the water consumption and strength, it is also necessary to pay attention to the time and the loss of the setting time and fluidity of the gypsum building materials.


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Waterproofing agent
The biggest defect of gypsum products is that the water resistance is poor, and the area with high air humidity has higher water resistance requirements for gypsum dry mortar. Generally, the water resistance of the hardened body of the gypsum is increased by the externally mixed water admixture. In the case of wet or saturated water, the externally mixed water-based admixture can make the softening coefficient of the hardened body of the gypsum reach 0.7 or more, thereby meeting the requirements for the strength of the product. Chemical admixtures may also be employed to reduce the solubility of gypsum (i.e., to increase the softening coefficient), to reduce the adsorption of gypsum to water (i.e., to reduce water absorption) and to reduce the erosion resistance (i.e., segregation with water) of gypsum hardened bodies. The gypsum water-repellent agent is ammonium borate, sodium silicon silicate, silicone resin, emulsified paraffin, and the silicone emulsion waterproofing agent is better.


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Active activator
The activation of natural and chemical anhydrite can be made to have adhesiveness and strength for the production of gypsum dry-mixed building materials. The acidic activator can accelerate the early hydration speed of anhydrite, shorten the setting time and improve the early strength of the gypsum hardened body. The alkaline activator has little effect on the early hydration rate of anhydrite, but it can significantly improve the late strength of the gypsum hardened body, and can form part of hydraulic cementitious material in the hardened gypsum body, effectively improving the water resistance of the hardened gypsum body. Sex. The acid-base complex type activator is superior to a single acidic or alkaline activator. The acidic activator is potassium alum, sodium sulfate, potassium sulfate, and the like. Alkaline activators include quicklime, cement, cement clinker, calcined dolomite, and the like.


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Thixotropic lubricant
The thixotropic lubricant is used in self-leveling gypsum or plastering gypsum to reduce the flow resistance of gypsum mortar, prolong the opening time, prevent stratification and sedimentation of the slurry, and thus obtain good lubricity and workability of the slurry. The body structure is uniform and the surface strength is increased.
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