Categories and Application Fields and Manufacturing Process and Action Mechanism of Water Retaining Agent

Table 3

Manufacturing process of WRA.

Method	Advantage	Disadvantage
Aqueous solution polymerization	The operation is simple and safe. It is suitable for large-scale preparation, with less waste, low energy consumption in the production process, high initiation efficiency, and sufficient system mixing	The polymerization temperature is difficult to control
Inverse suspension polymerization	The reaction speed is fast, and the product is uniform and has high water absorption rate and strong water retention ability	The production process consumes a lot of energy and generates more reaction heat, and the solvent recovery cost is high
Inverse emulsion polymerization	The temperature is easy to control, the preparation process is simple, and the water absorption rate of the product is high	Higher cost
Bulk polymerization	Single reactant and simple operation	A large amount of heat is generated in the production process, which is easy to implosion
Radiation crosslinking polymerization	The operation is simple, the purity of the product is high, and the reaction can be carried out even at low temperature, no environmental pollution	A large amount of equipment investment is required in the early stage