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 easy glue opening and low initial adhesion, and achieve the goal of improving final adhesion and heat resistance Effect
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[0014] The preparation method of the water-based polyurethane adhesive provided by a typical embodiment of the present invention comprises the steps of: dehydrating 150-250 parts by weight of polyester diol at 100-120°C and -0.08MPa, and cooling down the polyester diol Add 40-95 parts by weight of diisocyanate to 50-60°C, keep warm at 70-80°C for 1-2 hours; add 5-10 parts by weight of hydrophilic monomer containing carboxylic acid, 1-2 parts by weight of small molecule binary Alcohol chain extender, 1-4.5 parts by weight of dimethylol ethylene urea, and 0.1-0.2 parts by weight of catalyst are kept at 65-75°C for 2-3 hours, and 100-180 parts by weight of acetone is added to adjust the viscosity; When the isocyanate group content in the above reactants reaches the theoretical value, cool down to 45-50°C, add 3.4-8 parts by weight of neutralizing agent for salinization; after cooling down, add 150-285 parts by weight of deionized water under high-speed stirring to emulsify Disper...
Embodiment 1
[0031] Add 150g of polyneopentyl adipate (PNA) to a reaction kettle with a vacuum dehydration device equipped with a thermometer, a stirrer and a condensing device, and dehydrate at 100-120°C and -0.08MPa for 2 hours. Cool neopentyl glycol adipate (PNA) to 50-60°C, add 55g of isophorone diisocyanate (IPDI), keep it warm at 70-80°C for 1-2 hours; add 8g of dimethylol propionic acid ( DMPA), 1.2g of 1,4-butanediol (BDO), 1.5g of dimethylolethylene urea, 0.09g of dibutyltin dilaurate, keep warm at 65-75°C for 2-3 hours, and add 100g of acetone to adjust the viscosity; when the isocyanate content in the reactant reaches 2.1%wt, cool down to 45-50°C, add 5.73g of triethylamine for salinization for 30min; cool down to 30°C, add 170.8g of deionized Water emulsification and dispersion; after emulsification and dispersion, the stirring was continued for 1 hour, and then the acetone was removed under reduced pressure to obtain a milky white water-based polyurethane emulsion with a solid...
Embodiment 2
[0033]Add 180g of poly-1,2-propylene adipate (PPA) to a reaction kettle equipped with a thermometer, agitator and condensing device with a vacuum dehydration device, and dehydrate at 100-120°C and -0.08MPa for 2h, The above-mentioned polypropylene adipate (PPA) is cooled to 50-60°C, and 53g of hexamethylene diisocyanate (HDI) is added, and kept at 70-80°C for 1-2 hours; 10g of dimethylol is added Propionic acid (DMPA), 1g of 1,4-butanediol (BDO), 2.1g of dimethylol ethylene urea, 0.1g of dibutyltin dilaurate, at 65-75°C for 2-3 hours , and add 132g of acetone to adjust the viscosity; when the isocyanate content in the reactant reaches 2.78%wt, cool down to 45-50°C, add 7.35g of triethylamine for salinization for 30min; cool down to 30°C, add 194g of Emulsify and disperse with deionized water; after emulsify and disperse, keep stirring for 1 hour, and then remove the acetone under reduced pressure to obtain a milky white water-based polyurethane emulsion with a solid content of...
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