01
Coagulant
The setting agent is mainly divided into a retarder and a coagulant. In the gypsum dry mortar, the products prepared using the calcined gypsum use a retarder, and the products prepared using the anhydrous gypsum or directly using the dihydrate gypsum require a coagulant.


02
Retarder
The retarder is added to the gypsum dry-mixed building material to inhibit the hydration process of the hemihydrate gypsum and prolong the solidification time. The conditions for hydration of calcined gypsum are various, including the phase composition of the plaster, the temperature of the plaster material, the fineness of the granule, the setting time and the pH of the finished product. Each factor has a certain influence on the retarding effect, so there is a big difference in the amount of retarder in different situations. At present, the domestic special plaster retarder is a metamorphic protein (high protein) retarder, which has the advantages of low cost, long retardation time, small strength loss, good product construction and long opening time. In the preparation of the bottom type plaster plaster, the dosage is generally from 0.06% to 0.15%.


03
Coagulant
Accelerating slurry agitation time and prolonging slurry agitation speed are all one of the methods of physical coagulation. Chemical coagulants commonly used in building materials of anhydrous gypsum powder are acid substances such as potassium chloride, potassium silicate and sulfate. The dosage is generally from 0.2% to 0.4%.


04
Aquasorb
Gypsum dry mix building materials can not be separated from water retention agents. Increasing the water retention rate of the gypsum product slurry is to ensure that the water can exist in the gypsum slurry for a long time, thereby obtaining a good hydration and hardening effect. It is inseparable from the water retaining agent to improve the construction of gypsum powder building materials, reduce and prevent the segregation and bleeding of gypsum slurry, improve the sag of slurry, extend the opening time, and solve the engineering quality problems such as cracking and hollowing. Whether the water retaining agent is ideal depends mainly on its dispersibility, fast solubility, moldability, thermal stability and thickening. The most important indicator is water retention.