A kind of aqueous polyurethane adhesive and preparation method thereof
A water-based polyurethane and adhesive technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve problems such as poor water resistance, low initial adhesion, and weak ion stability, and achieve calcium ion Good stability, outstanding bonding strength, and the effect of reducing production costs
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Embodiment 1
[0024] The first step, polymerization: First weigh 80 g of polybutylene adipate and 1.6 g of polyethylene glycol monomethyl ether and add them to a four-necked flask equipped with a thermometer and a stirring paddle. Remove water under vacuum for 2 hours. After the dehydration is completed, cool down to 50 °C, and then add 15 g of acetone, 4.7 g of isophorone diisocyanate, 7.1 g of hexamethylene diisocyanate, and 0.05 g of 1,4-butane Add diol and 0.02 g of dibutyltin dilaurate into the reactor and gradually raise the temperature to 80 °C for 3 hours, take a sample, and measure the NCO value by the di-n-butylamine method. After the index is qualified, the temperature of the reactor is lowered to below 55 °C, and 85 g of acetone is added Reduce the viscosity, then drop into 0.11 g of amino-terminated silane coupling agent KH792 in the reactor, 0.8 g of sodium ethylenediaminoethanesulfonate, 0.6 g of isophorone diamine and 0.1 g of sodium pyrophosphate, react 20 minutes to get wa...
Embodiment 2
[0028] The first step, polymerization: take by weighing 80g polyhexamethylene adipate neopentyl glycol ester and the polyethylene glycol monomethyl ether of 1 g and join in the four-necked flask that thermometer is housed, stirring paddle, at temperature Under the environment of 100 ℃, remove water under vacuum for 2 hours. After the dehydration is completed, cool down to 50 ℃, then add 15 g of acetone, 5 g of isophorone diisocyanate, 7 g of hexamethylene diisocyanate, 0.04 g of 1, Add 4-butanediol and 0.02 g of dibutyltin dilaurate into the reactor and gradually raise the temperature to 80 °C for 3 hours, take samples, and measure the NCO value by the di-n-butylamine method. 85 g of acetone reduces the viscosity, and then puts into the reactor 0.22 g of amino-terminated silane coupling agent KH792, 1.2 g of sodium ethylenediamine ethanesulfonate, 0.6 g of isophorone diamine and 0.2 g of pyrophosphoric acid sodium, and reacted for 20 minutes to obtain a waterborne polyurethane...
Embodiment 3
[0032] The first step, polymerization: take by weighing 80 g polyhexamethylene adipate neopentyl glycol ester and 1.2 g polypropylene glycol monomethyl ether and join in the four-neck flask that thermometer is housed, stirring paddle, at a temperature of 100 Under vacuum for 2 hours at ℃, after dehydration, cool down to 50 ℃, then add 15 g of acetone, 4.7 g of isophorone diisocyanate, 7.1 g of hexamethylene diisocyanate, 0.05 g of 1,6 - Hexylene glycol and 0.02 g of dibutyltin dilaurate were added to the reactor and the temperature was gradually raised to 80°C for 3 hours, and samples were taken, and the NCO value was measured by the di-n-butylamine method. g acetone to reduce the viscosity, then put into the reactor 0.44 g of amino-terminated silane coupling agent KH792, 1.6 g of sodium ethylenediaminoethanesulfonate, 0.4 g of isophoronediamine and 0.1 g of sodium pyrophosphate , and reacted for 20 minutes to obtain a waterborne polyurethane prepolymer;
[0033]The second st...
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