A kind of aqueous polyurethane adhesive and preparation method thereof
A water-based polyurethane and adhesive technology, used in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problems of poor mechanical properties, poor thermal stability, low viscosity, etc., and achieve material uniformity Good, strong compatibility, high reactivity effect
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Embodiment 1
[0066] (1) 25 parts of vegetable oil polyols (derived from peanut oil, with a hydroxyl value of 140 mgKOH / g), 7.2 parts of diphenylmethane diisocyanate (MDI) and 4.8 parts of polymethylene polyphenyl polyisocyanate (PAPI), 0.8 Parts of dibutyltin dilaurate and 1.5 parts of trimethylolpropane were dehydrated under reduced pressure at 95°C for 1.5h respectively, and then cooled to below 60°C; 10 parts of epoxy resin I were dissolved in 7 parts of acetone to make a mixed solution;
[0067] (2) 25 parts of vegetable oil polyols (derived from peanut oil, with a hydroxyl value of 140 mgKOH / g), 7.2 parts of diphenylmethane diisocyanate (MDI) and 4.8 parts of polymethylene polyphenyl polyisocyanate (PAPI) were added to In the reaction kettle, heat up to 70°C, slowly add a mixed solution of 10 parts of epoxy resin I dissolved in 7 parts of acetone, and at the same time slowly add 0.8 parts of dibutyltin dilaurate and 1.5 parts of trimethylolpropane, after 3.5 hours of reaction , the t...
Embodiment 2
[0071] (1) 15 parts of vegetable oil polyols (derived from sesame oil, with a hydroxyl value of 130 mgKOH / g), 6 parts of toluene diisocyanate (TDI) and 4 parts of polymethylene polyphenyl polyisocyanate (PAPI), 0.5 parts of dilaurel Dibutyltin dibutyltin and 1 part of 1,4-butanediol were respectively dehydrated under reduced pressure at 90°C for 1 hour, and then cooled to below 60°C; 8 parts of epoxy resin I were dissolved in 5 parts of acetone to prepare a mixed solution;
[0072] (2) Add 15 parts of vegetable oil polyols (derived from sesame oil, with a hydroxyl value of 130 mgKOH / g), 6 parts of toluene diisocyanate (TDI) and 4 parts of polymethylene polyphenyl polyisocyanate (PAPI) into the reaction kettle , heat up to 60°C, slowly add a mixed solution of 8 parts of epoxy resin I dissolved in 5 parts of acetone, at the same time slowly add 0.5 parts of dibutyltin dilaurate and 1 part of 1,4-butanediol, react for 3 hours, then cool down to 40°C to obtain a polyurethane prepo...
Embodiment 3
[0076] (1) 20 parts of vegetable oil polyols (derived from soybean oil, with a hydroxyl value of 150 mgKOH / g), 6.6 parts of toluene diisocyanate (TDI) and 4.4 parts of diphenylmethane diisocyanate (MDI), 0.7 parts of dilauric acid diisocyanate Butyl tin and 1.7 parts of glycerin were respectively dehydrated under reduced pressure at 100°C for 2 hours, and then cooled to below 60°C; 11 parts of epoxy resin I were dissolved in 8 parts of acetone to prepare a mixed solution;
[0077] (2) 20 parts of vegetable oil polyols (derived from soybean oil, with a hydroxyl value of 150 mgKOH / g), 6.6 parts of toluene diisocyanate (TDI) and 4.4 parts of diphenylmethane diisocyanate (MDI) are added to the reactor, and the temperature is raised To 80°C, slowly add a mixed solution of 11 parts of epoxy resin I dissolved in 8 parts of acetone, and slowly add 0.7 parts of dibutyltin dilaurate and 1.7 parts of glycerin at the same time, after reacting for 4 hours, cool down to 50°C to obtain polyur...
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