Waterborne polyurethane adhesive for synthetic leather and preparation method thereof
A water-based polyurethane and adhesive technology, used in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problems of high health hazards, environmental pollution, and wide use of production personnel and application personnel. , to achieve the effect of easy control of flatness, reduction of treatment costs, and low irritation
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Embodiment 1
[0050] 1) Under argon atmosphere, 9.0kg of dicyclohexylmethane diisocyanate, 12kg of polytetrahydrofuran ether glycol and 0.005kg of phosphoric acid are reacted at 70°C for 1.5 hours in a reactor equipped with reflux condenser, thermometer and stirring, using HG / T2409-1992 standard detects isocyanate group content reduced to 2.0%;
[0051] 2) Cool down to 40℃, add 0.005kg stannous octoate, 0.8kg dimethylolpropionic acid, 0.03kg trimethylolpropane, 1.1kg trimethylolpropane polyoxypropylene polyoxyethylene ether, After 0.09kg of 1,6-hexanediol and 5kg of methyl acetate, the temperature is increased to 85°C, and the temperature is kept at 85°C to continue the reaction for 3 hours;
[0052] 3) Cool down to 50℃, add 0.03kg tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol ester, 0.02 kg methyl tin mercaptan, stir for 10 minutes, then Add 0.6kg of dimethylaminoethanol to the reaction kettle to neutralize the reaction solution, and continue the reaction at 50°...
Embodiment 2
[0056] 1) Under a nitrogen atmosphere, 9.6kg of dicyclohexylmethane diisocyanate, 18.2kg of polytetrahydrofuran ether glycol and 0.01kg of phosphoric acid were reacted at 90°C for 2 hours in a reactor equipped with reflux condenser, thermometer and stirring, using HG / T2409-1992 standard detects the isocyanate group content reduced to 1.5%;
[0057] 2) Cool down to 50℃, add 0.015kg stannous octoate, 1.5kg dimethylolpropionic acid, 0.08kg trimethylolpropane, 1.2kg trimethylolpropane polyoxypropylene polyoxyethylene ether, After 0.15 kg of 1,6-hexanediol and 9 kg of ethyl acetate, the temperature is increased to 80°C, and the reaction is kept at 80°C for 3.5 hours;
[0058] 3) Cool down to 40°C, add 0.08kg tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol ester, 0.03㎏ methyl tin mercaptan, stir for 15 minutes, then Add 1.0kg of dimethylaminoethanol to the reaction kettle to neutralize the reaction solution, and continue the reaction at 40°C for 15 minutes;...
Embodiment 3
[0062] 1) Under argon atmosphere, 9.3kg of dicyclohexylmethane diisocyanate, 15.5kg of polytetrahydrofuran ether glycol and 0.008kg of phosphoric acid were reacted at 80℃ for 1.8 hours in a reactor equipped with reflux condenser, thermometer and stirring. HG / T2409-1992 standard detects that the content of isocyanate groups is reduced to 1.8%;
[0063] 2) Cool down to 45℃, add 0.007kg stannous octoate, 0.6kg dimethylolpropionic acid, 0.05kg trimethylolpropane, 0.7kg trimethylolpropane polyoxypropylene polyoxyethylene ether, After 0.1 kg of 1,6-hexanediol and 10 kg of propyl acetate, the temperature is increased to 80°C, and the reaction is continued for 3 hours while keeping the temperature at 80°C;
[0064] 3) Cool down to 45℃, add 0.06kg tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol ester, 0.02 ㎏ methyl tin mercaptan, stir for 13 minutes, then Add 0.8kg of dimethylaminoethanol to the reaction kettle to neutralize the reaction solution, and continue ...
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