Emulsion type water-base polyurethane adhesive for polyurethane conveying belt and synthetic method thereof
A technology of water-based polyurethane and conveyor belts, which is applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., and can solve problems such as difficulty in meeting high temperature resistance requirements and low bonding strength
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Embodiment 1
[0021] Weigh 50g polycarbonate polyol JSH-10 (M n =1000) in a 500ml three-neck flask, vacuum dehydrated in an oil bath at 120°C for 1h. Then cool down to 80°C, add 22.4g of isophorone diisocyanate (IPDI), 26.5g of dicyclohexylmethane diisocyanate (HMDI), 2d dibutyltin dilaurate as a catalyst, control the oil bath at 80-90°C, and stir the reaction 2h. Add 6.7g of dimethylolpropionic acid (DMPA) and 10ml of acetone, control the oil bath at 70-80°C, and react for 1h. Lower the temperature and control the oil bath at 60-70°C, then add 3.0g of butanediol and 8ml of acetone, react for 1 hour and then cool down to 40°C, add 19.0g of triethylamine-dichloromethane complex, stir well, then add 110ml of water, Stirring was continued for 30 minutes, and a white emulsion with a solid content of 45% was obtained after vacuum distillation, and the average particle size of the emulsion was 0.107 μm.
[0022] Add water-dispersible polyisocyanate curing agent to the above-mentioned emulsion ...
Embodiment 2
[0024] Weigh 50g polycarbonate polyol JSH-20 (M n =2000) in a 500ml three-neck flask, vacuum dehydrated in an oil bath at 120°C for 1h. Then cool down to 80°C, add 11.1g of isophorone diisocyanate (IPDI), 13.1g of dicyclohexylmethane diisocyanate (HMDI), 1d of dibutyltin dilaurate as a catalyst, control the oil bath at 80-90°C, and stir the reaction 2h. Add 6.7g of dimethylolpropionic acid (DMPA) and 10ml of acetone, control the oil bath at 70-80°C, and react for 1h. Lower the temperature and control the oil bath at 60-70°C, then add 2.3g of butanediol and 5ml of acetone, react for 1 hour and then cool down to 40°C, add 9.5g of triethylamine-dichloromethane complex, stir well, then add 120ml of water, Stirring was continued for 30 minutes, and a white emulsion with a solid content of 40% was obtained after vacuum distillation, and the average particle size of the emulsion was 0.143 μm.
[0025] Add water-dispersible polyisocyanate curing agent to the above-mentioned emulsio...
Embodiment 3
[0026] Embodiment 3 (prepolymer method)
[0027] Weigh 100g polycarbonate polyol JSH-20 (M n =2000) in a 1000ml three-neck flask, vacuum dehydrated in an oil bath at 120°C for 1h. Then cool down to 80°C, add 14.8g of isophorone diisocyanate (IPDI), 35.0g of dicyclohexylmethane diisocyanate (HMDI), 2d dibutyltin dilaurate as a catalyst, control the oil bath at 80-90°C, and stir the reaction 2h. Add 13.4g of dimethylolpropionic acid (DMPA) and 10ml of acetone, control the oil bath at 70-80°C, and react for 1h. Lower the temperature and control the oil bath at 60-70°C, then add 4.5g of butanediol and 10ml of acetone, react for 1 hour and then cool down to 40°C, add 19.0g of triethylamine-dichloromethane complex, stir well, then add 220ml of water, Stirring was continued for 30 minutes, and a white emulsion with a solid content of 45% was obtained after distillation under reduced pressure, and the average particle size of the emulsion was 0.167 μm.
[0028] The above emulsion ...
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