Waterborne polyurethane with high self-healing capability and application thereof
A water-based polyurethane and prepolymer technology, applied in the direction of prosthesis, medical science, etc., can solve the problems of poor touch, no hydrophilic ability, low self-healing efficiency, etc., and achieve high-efficiency self-healing ability and hydrophilic performance. Excellent, environmentally friendly performance
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Embodiment 1
[0029] The preparation of a high self-healing water-based polyurethane comprises the following steps:
[0030] Weigh 90g polytetrahydrofuran polyol (molecular weight 3000), 18g organosilicon polyether polyol (molecular weight 1800) and 26.64g isophorone diisocyanate into the three-necked flask, and stir and react at 90°C for 2h; then put into the three-necked flask Add 3g dimethylolpropionic acid, 3.24g 2,2,3,3,4,4-hexafluoro-1,5-pentanediol, 3.75g bis(4-hydroxyphenyl)disulfide, 0.1g g 1,4-butanediol and 15g acetone were stirred at 80°C for 2h; then 0.29g organic bismuth catalyst DY-20 and 10g acetone were added, the reaction temperature was lowered to 70°C, and the reaction was continued for 3h; the obtained prepolymer The body was cooled to 50°C, 2.26g of triethylamine was added to react for 2min, 3.75g of fluorine-containing nonionic emulsifier FS-3100 and 225g of distilled water were stirred evenly, then added to a three-necked flask for emulsification, and finally 2.81g o...
Embodiment 2
[0032] The preparation of a high self-healing water-based polyurethane comprises the following steps:
[0033] Weigh 90g polyether polyol PPG-3000 (molecular weight 3000), 18g organosilicon polyether polyol (molecular weight 1800) and 31.44g 4,4-dicyclohexylmethane diisocyanate into the three-necked flask, and stir the reaction at 90°C 2h; then add 3g dimethylolpropionic acid, 3.24g 2,2,3,3,4,4-hexafluoro-1,5-pentanediol, 3.75g bis(4-hydroxybenzene) to the three-necked flask respectively base) disulfide, 0.1 g of 1,4-butanediol and 15 g of acetone, and the reaction was continued to stir at 80 °C for 2 h; then 0.29 g of organic bismuth catalyst DY-20 and 10 g of acetone were added, the reaction temperature was lowered to 70 °C, and the reaction was continued. 3h; Cool the obtained prepolymer to 50°C, add 2.26g of triethylamine to react for 2min, stir 3.8g of fluorine-containing nonionic emulsifier FS-3100 and 238g of distilled water, add to the three-necked flask to emulsify an...
Embodiment 3
[0035] The preparation of a high self-healing water-based polyurethane comprises the following steps:
[0036] Weigh 90g polycarbon polyol PCD-3000 (molecular weight 3000), 18g organosilicon polyether polyol (molecular weight 1800) and 31.44g 4,4-dicyclohexylmethane diisocyanate into the three-necked flask, and stir the reaction at 90°C 2h; then add 3g dimethylolpropionic acid, 3.24g 2,2,3,3,4,4-hexafluoro-1,5-pentanediol, 3.75g bis(4-hydroxybenzene) to the three-necked flask respectively base) disulfide, 0.1 g of 1,4-butanediol and 15 g of acetone, and the reaction was continued to stir at 80 °C for 2 h; then 0.29 g of organic bismuth catalyst DY-20 and 10 g of acetone were added, the reaction temperature was lowered to 70 °C, and the reaction was continued. 3h; Cool the obtained prepolymer to 50°C, add 2.26g of triethylamine to react for 2min, stir 3.8g of fluorine-containing nonionic emulsifier FS-3100 and 238g of distilled water, add to the three-necked flask to emulsify a...
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