High-performance waterborne polyurethane resin for textile coatings and method for preparing high-performance waterborne polyurethane resin
A water-based polyurethane and textile coating technology, which is applied in the direction of liquid-repellent fibers and improved hand-feeling fibers, can solve the problems of poor quality, unsatisfactory hand feel and resilience, and firm water resistance of water-based polyurethane-based textile coating products Poor resistance and other problems, to achieve the effect of plump and smooth hand feeling, excellent water resistance and good firmness
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Embodiment 1
[0045] 1) Add 40g of polyoxypropylene diol, 16g of polyoxypropylene triol, 5g of hydroxyl-terminated polysiloxane diol into a three-necked flask, then add 25g of toluene diisocyanate, heat up to 85°C, and react for 2 hours;
[0046] 2) Cool down to 50°C, add 3g of ethylene glycol, 4g of dimethylolpropionic acid, 0.15g of stannous octoate and 40g of acetone, stir and mix, heat to 80°C, and react for 3 hours;
[0047] 3) Cool down to 50°C, add 1g of γ-glycidyl etheroxypropyl trimethoxysilane, and react for 20 minutes;
[0048] 4) Cool down to 10°C, add 4g of triethylamine to neutralize, add 185g of ice-water mixture to emulsify and disperse, adjust the temperature to 4°C, add 4g of ethylenediamine, extend the chain for 5 minutes, and continue to emulsify and disperse;
[0049] 5) Acetone is removed by distillation under reduced pressure to obtain an aqueous polyurethane resin emulsion.
Embodiment 2
[0051] 1) Add 30g of polyoxypropylene diol, 12g of polyoxypropylene triol, 7g of hydroxyl-terminated polysiloxane diol into a three-necked flask, then add 15g of diphenylmethane diisocyanate, heat up to 80°C, and react for 2 hours;
[0052] 2) Cool down to 40°C, add 5g of 1,4-butanediol, 2g of dimethylolpropionic acid, 0.1g of zinc caprylate and 30g of methyl ethyl ketone, stir and mix, heat to 70°C, and react for 2 hours;
[0053]3) Cool down to 45°C, add 0.5g of γ-glycidyloxypropyltrimethoxysilane, and react for 8 minutes;
[0054] 4) Cool down to 10°C, add 2g of triethylamine to neutralize, add 180g of ice-water mixture to emulsify and disperse, adjust the temperature to 2°C, add 2g of 1,4-cyclohexanedimethylamine, extend the chain for 4min, and continue to emulsify and disperse;
[0055] 5) removing butanone by distillation under reduced pressure to obtain an aqueous polyurethane resin emulsion.
Embodiment 3
[0057] 1) Add 50 g of polyoxypropylene diol, 10 g of polyoxypropylene triol, 8 g of hydroxyl-terminated polysiloxane diol into a three-necked flask, then add 30 g of hexamethylene diisocyanate, heat up to 85° C., and react for 3 hours;
[0058] 2) Cool down to 45°C, add 4g of 2-methyl-1,3-propanediol, 3g of dimethylol butyric acid, 0.2g of zinc isooctanoate and 45g of methyl ethyl ketone, stir and mix, heat to 75°C, and react for 3 hours;
[0059] 3) Cool down to 40°C, add 1.5g of γ-glycidoxypropyltrimethoxysilane, and react for 15 minutes;
[0060] 4) Cool down to 15°C, add 3g of triethylamine to neutralize, add 185g of ice-water mixture to emulsify and disperse, adjust the temperature to 3°C, add 3g of isophoronediamine, extend the chain for 5 minutes, and continue to emulsify and disperse;
[0061] 5) Methyl ethyl ketone was removed by distillation under reduced pressure to obtain an aqueous polyurethane resin emulsion.
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