A kind of water-based polyurethane, its preparation method and water-based polyurethane adhesive
A water-based polyurethane and adhesive technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of high and low temperature impact resistance and poor moisture and heat resistance
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[0052] The present invention provides a method for preparing the aqueous polyurethane described in the above technical scheme, which includes the following steps:
[0053] a) Under the condition of nitrogen or inert gas, react poly(carbonate-ether) glycol, polyethylene glycol and aliphatic diisocyanate in an organic solvent to obtain the first intermediate;
[0054] b) Under the action of a catalyst, react an alcohol compound with a hydroxyl number ≥ 3 and the first intermediate obtained in step a) in an organic solvent to obtain a second intermediate;
[0055] c) The diol chain extender and the second intermediate obtained in step b) are reacted in an organic solvent to obtain an aqueous polyurethane having a structure represented by formula I or formula II.
[0056] Under nitrogen or inert gas conditions, the present invention reacts poly(carbonate-ether) glycol, polyethylene glycol and aliphatic diisocyanate in an organic solvent to obtain the first intermediate. In the present inv...
Embodiment 1
[0112] Place 180 g of poly(carbonate-ether) glycol with a molecular weight of 1500 daltons containing 78.6% carbonate units and 30 g of polyethylene glycol with a molecular weight of 400 daltons in a three-necked flask, and mix the resultant The solution is heated to 110℃, dehydrated at -0.98MPa for 1h, cooled to 75℃, under the protection of nitrogen, 130mL acetone is added, 75g isophorone diisocyanate is added dropwise, the drip rate is 6mL / min, after the addition is complete , React for 2h to obtain the first intermediate;
[0113] 100mL of acetone was added to the obtained first intermediate, the temperature was lowered to 70°C, 0.0015g of dibutyltin dilaurate and 10.2g of trimethylolpropane were added to the obtained first intermediate, and the reaction was carried out for 0.5h to obtain the second intermediate;
[0114] Add 180 mL of acetone to the second intermediate, raise the temperature to 85°C, then add 9.8g of diethylene glycol to it, react for 2h, cool to 35°C, add 312g...
Embodiment 2
[0120] Put 610g of poly(carbonate-ether) glycol with a molecular weight of 5000 Daltons containing 60.8% carbonate units and 80g of polyethylene glycol with a molecular weight of 800 Daltons in a three-necked flask and heat it to 120°C. Dehydrate at -0.98MPa for 3h, lower the temperature to 85℃, and under the protection of nitrogen, add 210mL of methyl ethyl ketone, and add 116g of isophorone diisocyanate dropwise. The dropping acceleration rate is 13mL / min. After the dropping, react for 4h to obtain the first An intermediate
[0121] Add 220 mL of butanone to the first intermediate, lower the temperature to 75°C, then add 0.0040 g of stannous octoate and 16.8 g of trimethylolpropane to the first intermediate, and react for 2 hours to obtain the second intermediate;
[0122] Add 260 mL of butanone to the second intermediate, raise the temperature to 90°C, then add 16.5g of diethylene glycol to it, react for 3h, cool to 40°C, add 731g of deionized water, and then remove butane under...
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