Enclosed type polyurethane curing agent emulsion and preparation method and applications thereof
A polyurethane curing agent, a closed-type technology, used in polyurea/polyurethane adhesives, polyurea/polyurethane coatings, adhesives, etc., can solve problems such as high cost, inconvenience for users, environmental protection, etc., to solve stability problems, Good water resistance, easy to use effect
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[0073] Example 1
[0074] a) Preparation of polyisocyanate prepolymers containing sulfonic acid groups
[0075] In the reactor, mix 140 grams of sulfonate glycol (molecular weight 550, solid content of 70%) and 110 grams of ethyl acetate, stir evenly, add 300 grams of HDI trimer (solid content of 100%) Measure the NCO percentage of the reactant after heating to 55~60℃ for 2 hours, then add 106.2 g HMDI, heating to 60℃ for 1 hour, 70℃ for 1 hour, 80℃ for 4 hours, 90℃ for 4 hours Content, when the NCO declines and stabilizes and approaches 14%, stop the reaction;
[0076] b) Preparation of blocked polyisocyanate prepolymer
[0077] Cool down to 50°C, add 190g of methyl ethyl ketoxime in four times, control the feeding temperature at 50-55°C, and complete the addition in 2 hours. After the addition, react at 60-70°C for 1 hour, and at 75-80°C for 3 hours to obtain a seal. Type polyisocyanate prepolymer, that is, blocked polyurethane curing agent; lower the temperature to 40°C, take out...
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[0084] Example 2
[0085] a) Preparation of polyisocyanate prepolymers containing sulfonic acid groups
[0086] In the reactor, mix 150 grams of sulfonate glycol (molecular weight 550, solid content of 70%) and 80 grams of acetone, stir evenly, add 400 grams of TDI prepolymer (TDI and trimethylolpropane Prepolymer), heated to 55~60℃ for 2 hours, then added 120 g of MDI, reacted at 60℃ for 1 hour, 70℃ for 1 hour, 80℃ for 3 hours, and then measured the NCO percentage of the reactant. When Stop the reaction when the decrease of NCO stabilizes and approaches 11%;
[0087] b) Preparation of blocked polyisocyanate prepolymer
[0088] Cool down to 50°C, add 180g of methyl ethyl ketoxime in four times, control the feeding temperature at 50-55°C, and complete the addition in 2 hours. After the addition, react at 65-70°C for 1.5 hours to obtain a blocked polyisocyanate prepolymer, namely Sealed polyurethane curing agent; lower the temperature to 40°C, take out 310 grams of the reaction produc...
Example Embodiment
[0096] Example 3
[0097] a) Preparation of polyisocyanate prepolymers containing sulfonic acid groups
[0098] In the reactor, 120 grams of sulfonate glycol (molecular weight is 550, solid content is 70%) and 180 grams of methyl acetate are mixed and stirred uniformly, 400 grams of MDI are added, and the reaction is heated to 50°C for 1 hour. React at 70~75°C for 3 hours. Cool down to 50°C, add 55g of trimethylolpropane four times within 2 hours. The temperature in the kettle needs to be lowered to 50~55℃ for each addition. After the addition, react at 60~65℃ for 1 hour. Measure the NCO percentage of the reactants after reacting at ~75°C for 2 hours, and stop the reaction when the NCO decreases and stabilizes and approaches 10%;
[0099] b) Preparation of blocked polyisocyanate prepolymer
[0100] Cool down to 50°C, add 92 grams of ethanol in four times, control the feeding temperature at 50-55°C, complete the addition within 2 hours, and continue to keep at 60-65°C for 2 hours.
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