Solvent-free method for preparing non-ionic water-borne polyurethane
A water-based polyurethane and non-ionic technology, applied in the field of polymers, can solve problems such as difficult dispersion, and achieve the effects of easy dispersion, control of the synthesis process, and uniform distribution
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Embodiment 1
[0033] Add 500g of polyethylene glycol monomethyl ether (average molecular weight: 650) to the four-necked flask, raise the temperature to 110°C and apply vacuum for 1h, then cool down to 85°C, add 171g of isophorone diisocyanate (IPDI) to react for 2h. Then add 231 g of polyether 303 (molecular weight: 300, functionality: 3) that was vacuum dehydrated at 110°C for 1 h, and continue the reaction for 4 h to obtain a "Y"-shaped side chain nonionic hydrophilic chain extender containing 2 terminal hydroxyl groups.
[0034]Add 20g polyhexamethylene adipate diol (molecular weight is 2000), 40g polytetrahydrofuran ether diol (molecular weight is 2000), 6g polyether 303 (molecular weight is 300, functionality is 3) to four-necked flask After heating and melting the mixture, vacuumize at 110°C for 1h, then cool down to 85°C, add 58.8g of IPDI and 1 drop of zinc / bismuth composite catalyst to react for 2h, then cool down to 80°C, add 50.6g of the above-mentioned "Y"-shaped side chain non-...
Embodiment 2
[0037] Add 60g of polytetrahydrofuran ether diol (molecular weight: 2000), 6g of polyether 303 (molecular weight: 300, functionality: 3) into the four-necked flask, after heating and melting, vacuumize at 110°C for 1h, then cool down to 85°C, add 67.6 gIPDI reacted with 1 drop of zinc / bismuth composite catalyst for 2 hours, then cooled down to 75°C, added 50.9g of the "Y"-shaped side chain non-ionic hydrophilic chain extender prepared in Example 1, kept the reaction for 2 hours, and then added 7.5 g1,4-butanediol heat preservation reaction for 1.5h, then lower the temperature to below 70°C, add 57.3g of dehydrated polytetrahydrofuran ether glycol (molecular weight: 650), 4.6g of liquid paraffin and stir for 1 minute, then immediately add 276g of deionized water , disperse at a high speed (2500rpm) at a temperature lower than 20°C for 15 minutes, then rapidly raise the temperature to 50°C, add an appropriate amount of zinc / bismuth composite catalyst dropwise, stir at a low speed...
Embodiment 3
[0040] Add 20g polyhexamethylene adipate diol (molecular weight is 2000), 40g polytetrahydrofuran ether diol (molecular weight is 2000), 6g polyether 303 (molecular weight is 300, functionality is 3 ) after heating and melting, vacuumize at 110°C for 1h, then cool down to 85°C, add 58.8g IPDI and 1 drop of zinc / bismuth composite catalyst to react for 2h, then cool down to 80°C, add 50.6g of "Y" prepared in Example 1 Shaped side chain non-ionic hydrophilic chain extender, keep warm for 2 hours, then cool down to 75°C, add 3.5g of 1,4-butanediol and keep warm for 1.5h, then cool down to below 70°C, add 6.3g Mixture of ethylene glycol and 6.3g of neopentyl glycol, 4.6g of liquid paraffin, stirred for 1 minute, immediately added 281g of deionized water, dispersed at a high speed (rotating speed 2500rpm) for 15min under the condition of lower than 20°C, then rapidly raised the temperature to 50°C, and added dropwise Appropriate amount of zinc / bismuth composite catalyst, low-speed s...
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