Aqueous polyurethane adhesive for composite film and its preparing process
A technology of water-based polyurethane and composite film, applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problems of flammability, poor safety, pollution of the environment, etc., achieve safe use and improve bonding strength and the apparent effect
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Embodiment 1
[0035] In a reactor equipped with a stirrer, a thermometer, and a reflux condenser, add 70 g of polyester diol (molecular weight: 2000), 9.1 g of toluene diisocyanate, and 1.7 g of dimethylol propionic acid, raise the temperature to 75°C, and add 0.02g of dibutyltin dilaurate, react for 4 hours under stirring, then cool down to about 35°C, add 0.6g of γ-aminopropyltriethoxysilane, continue to react for 1 hour to obtain a prepolymer, add 1.2g of triethyl The amine neutralizes the prepolymer to form a salt, and adds 30 g of acetone to reduce the viscosity, then adds 117 g of deionized water under high-speed shearing, and finally heats up to evaporate the acetone to obtain a bluish milky white internal crosslinked aqueous polyurethane dispersion. Its properties are as follows: solid content: 38.1%; pH value: 6.8; viscosity (coating -4 cups / 25°C): 14 seconds.
Embodiment 2
[0037] In the reactor that stirrer, thermometer, reflux condenser are equipped with, add polyester diol (molecular weight is 2000) 60g, polyether diol (molecular weight is 2000) 10g, toluene diisocyanate 9g, and use 7.2 in advance The solution obtained by dissolving g N-methylpyrrolidone and 1.2g dimethylolpropionic acid was stirred and heated to 70°C, and the reaction was continued for 4 hours. After cooling down to about 35°C, 0.8g triethanolamine was added and reacted for 1 hour to obtain a prepolymer Add 0.9g of triethylamine to neutralize the prepolymer to form a salt, and add 26g of acetone to reduce the viscosity, then add 97g of deionized water under high-speed shear, heat up and steam the acetone to obtain a bluish milky white aqueous polyurethane dispersion. Its properties are as follows: solid content: 39.0%; pH value: 7.2; viscosity (coating -4 cups / 25°C): 16 seconds.
Embodiment 3
[0039] In the reactor that stirrer, thermometer, reflux condenser are equipped with, add polyester diol (molecular weight is 2000) 60g, polyether diol (molecular weight is 2000) 10g, toluene diisocyanate 9g, and use 7.2 in advance The solution obtained by dissolving g N-methylpyrrolidone and 1.2g dimethylolpropionic acid was stirred and heated to 70°C, and the reaction was continued for 4 hours, then cooled to about 35°C, 0.4g of diethylenetriamine was added, and reacted for 1 hour to obtain Prepolymer, add 0.9g triethylamine to neutralize the prepolymer to form a salt, and add 28g acetone to reduce the viscosity, then add 97g deionized water under high-speed shear, heat up and steam the acetone to obtain a bluish milky white water-based polyurethane dispersion body. Its properties are as follows: solid content: 39.8%; pH value: 7.4; viscosity (coating -4 cups / 25°C): 15 seconds.
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