The defoaming agent should have the following properties: ①Strong defoaming power and low dosage; ②Adding to the foaming system does not affect the basic properties of the system, that is, it does not react with the defoaming system; ③Small surface tension; ④ Surface tension Good balance; ⑤good heat resistance; ⑥good diffusibility, permeability, high positive spreading coefficient; ⑦chemical stability, strong oxidation resistance; ⑧good gas solubility and permeability; ⑨in foaming The solubility in the solution is small; ⑩ no physiological activity, high safety. [2] 

The application of defoamers is very wide, such as food industry, paper industry, water treatment, oil extraction industry, printing and dyeing industry, coating industry, detergent industry, rubber latex industry, aerosol industry, daily chemical industry, pharmaceutical industry, dairy industry, etc. .