Waterborne polyurethane adhesive and preparation method thereof
A water-based polyurethane and adhesive technology, applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problems of good water resistance, poor adhesion, small cohesive energy, etc., and achieve good water resistance , Water resistance improvement, good bonding strength effect
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Embodiment 1
[0019] In a glass reactor equipped with a stirrer, a thermometer and a reflux condenser, add 100 g of polyadipate-1,6-hexanediol and 10 g of castor oil, and dry it under vacuum for 1 hour at 100°C to 120°C, add Toluene diisocyanate 35g, dibutyltin dilaurate 0.02g, heat up to 70-85°C and react for 2 hours, add dimethylolpropionic acid DMPA 5g and react for 1 hour, then cool down to below 40°C, add 3-aminopropyl 2 g of triethoxysilane was stirred for 30 min, and 6 g of triethylamine was added to neutralize the polymer to form a salt, and 50 g of acetone was added to reduce the viscosity, and then 237 g of deionized water was added under high-speed shear for emulsification, and finally the temperature was raised to evaporate the acetone. Obtain the bluish milky white water-based polyurethane adhesive, its solid content: 40%, the solid content is tested according to the GB / T2793-1995 standard; the viscosity is (coated with -4 cups, 25°C): 17s, and the viscosity is according to the ...
Embodiment 2
[0021] In a glass reactor equipped with a stirrer, a thermometer and a reflux condenser, add 100 g of polyadipate-1,4-butanediol neopentyl glycol, 20 g of castor oil, 45 g of isophorone diisocyanate, and add octanoic acid sub- Tin 0.02g, heat up to 73-86°C and react for 2 hours, add 8g of dimethylolpropionic acid DMPA and react for 1 hour, then cool down to below 40°C, add 4g of 3-glycidyl etheroxypropyl trimethoxysilane Stir for 30 minutes, add 10g of triethylamine to neutralize the polymer to form a salt, and add 52g of acetone to reduce the viscosity, then add 305g of deionized water to emulsify under high-speed shear, and finally heat up to evaporate the acetone to obtain a bluish milky white water-based product. Polyurethane adhesive, its solid content: 38%, the solid content is tested according to the GB / T2793-1995 standard; the viscosity is (coated - 4 cups, 25°C): 15s, the viscosity is tested according to the GB / T2794-1995 standard.
Embodiment 3
[0023] In a glass reactor equipped with a stirrer, a thermometer and a reflux condenser, add 100 g of polycaprolactone diol and 15 g of castor oil, dry it under vacuum at 100°C to 120°C for 1 hour, add diphenylmethane-4, 40g of 4'diisocyanate, 0.03g of dibutyltin dilaurate, heat up to 72-90°C and react for 2 hours, then add 7g of dimethylolpropionic acid DMPA to react for 1 hour, then cool down to below 40°C, add 3-aminopropyl 3 g of triethoxysilane was stirred for 30 min, 8 g of triethylamine was added to neutralize the polymer to form a salt, and 47 g of acetone was added to reduce the viscosity, and then 249 g of deionized water was added under high-speed shear for emulsification, and finally the acetone was evaporated by heating , to obtain a bluish milky white water-based polyurethane adhesive, its solid content: 41%, the solid content is tested according to the GB / T2793-1995 standard; the viscosity is (coated with -4 cups, 25°C): 18s, and the viscosity is according to GB / ...
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