Multifunctional surfactant and preparation method thereof

[0025] The second aspect of the present invention provides a method for preparing the multifunctional surfactant, which includes the following steps: putting polyol polymer into a reactor and raising the temperature to 70-90°C to melt, and then heating to 110-130°C after being completely melted. Vacuum for 2 hours, add polyisocyanate, and test the isocyanate content after reacting at 80-90°C for a certain period of time. After the isocyanate content reaches the standard, add hydroxyl-containing resin and catalyst to react for 3-4 hours to get it.

[0026] The catalyst is not particularly limited, and is a commonly used catalyst in the field, and organotin and organic bismuth can be cited.

[0027] Preferably, after the isocyanate content is less than 0.1% by weight, the hydroxyl-containing resin is added.

[0028] The test method of the isocyanate content (NCO) is a commonly used test method in the field. For example, referring to the industry standard HG / T 2409-92, using hydrochloric

[0038] Example 1

[0039] A multifunctional surfactant, calculated by weight percentage, comprises the following components: 48% of polyol polymer, 44% of polyisocyanate, and the balance of hydroxyl-containing resin. The polyol polymer model is PEG1500, the hydroxyl value is 68-83mgKOH / g, and it was purchased from Qingdao Yinoxin New Material Co., Ltd. The polyisocyanate is toluene diisocyanate and toluene-2,4,6-triyl triisocyanate (CAS No. 7373-26-4), the toluene diisocyanate and toluene-2,4,6-triyl triisocyanate The weight ratio is 3:2. The hydroxyl-containing resin is E-51 and E-44, and the weight ratio of E-51 and E-44 is 6.8:2.

[0040] The preparation method of the multifunctional surfactant includes the following steps: putting the polyol polymer into the reactor and raising the temperature to 80°C to melt, after completely melting, the temperature is raised to 120°C and vacuuming for 2 hours, adding the polyisocyanate, and the reaction is constant at 80°C After time, the

[0041] Example 2

[0042] A multifunctional surfactant, in terms of weight percentage, comprises the following components: 40% polyol polymer, 48% polyisocyanate, and the balance of hydroxyl-containing resin. The polyol polymer model is PEG1500, the hydroxyl value is 68-83mgKOH / g, and it was purchased from Qingdao Yinoxin New Material Co., Ltd. The polyisocyanate is toluene diisocyanate and toluene-2,4,6-triyl triisocyanate (CAS No. 7373-26-4), the toluene diisocyanate and toluene-2,4,6-triyl triisocyanate The weight ratio is 2:1. The hydroxyl-containing resin is E-51 and E-44, and the weight ratio of E-51 and E-44 is 2:1.

[0043] The specific steps of the preparation method of the multifunctional surfactant are the same as in Example 1.