Degradable waterborne polyurethane, and preparation method and applications thereof
A water-based polyurethane and polyurethane prepolymer technology, applied in polyurea/polyurethane coatings, coatings, conductive coatings, etc., can solve the problems of insufficient color fastness of printed images, poor ink absorption effect, and easy generation of static electricity. Shorten the reaction catalysis time, good biodegradation advantages, and accelerate the effect of biodegradability
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Embodiment 1
[0076] Put 100g of dehydrated lactic acid and 2g of 1,4-butanediol into a 500ml four-neck flask and mix thoroughly, raise the temperature to 122°C at a rate of 3°C / min, continue esterification for 3.5 hours, and remove small molecular impurities by vacuuming under reduced pressure Finally, add 0.2g organic bismuth catalyst, continue to heat up to 185°C at a rate of 3°C / min, and stop heating for 8 hours for constant temperature polycondensation reaction. After cooling down, the product is dissolved in chloroform, and then precipitated with absolute ethanol. After the drying treatment, 38 g of hydroxyl-terminated polybutylene lactate was obtained.
[0077] Add 30g of polybutylene lactate and 6g of polybutylene succinate into a 500ml four-neck flask, mix at 125°C to form a molten mixture, then vacuum dry for 1 hour, and cool to 50°C; Add a dibasic isocyanate mixture containing 26 g of isophorone diisocyanate and 10 g of hexamethylene diisocyanate into a four-neck flask to form a ...
Embodiment 2
[0091] Put 100g of dehydrated lactic acid and 2g of 1,4-butanediol into a 500ml four-neck flask and mix thoroughly, raise the temperature to 122°C at a rate of 3°C / min, continue esterification for 3.5 hours, and remove small molecular impurities by vacuuming under reduced pressure Finally, add 0.2g organic bismuth catalyst, continue to heat up to 185°C at a rate of 3°C / min, and stop heating for 8 hours for constant temperature polycondensation reaction. After cooling down, the product is dissolved in chloroform, and then precipitated with absolute ethanol. After the drying treatment, 38 g of hydroxyl-terminated polybutylene lactate was obtained.
[0092]Add 30g of polybutylene lactate and 12g of polybutylene succinate into a 500ml four-neck flask, mix at 130°C to form a molten mixture, then vacuum dry for 2 hours, and cool to 60°C; Add a dibasic isocyanate mixture containing 22 g of isophorone diisocyanate and 11 g of hexamethylene diisocyanate into a four-neck flask to form a...
Embodiment 3
[0106] Put 100g of dehydrated lactic acid and 2g of 1,4-butanediol into a 500ml four-neck flask and mix thoroughly, raise the temperature to 122°C at a rate of 3°C / min, continue esterification for 3.5 hours, and remove small molecular impurities by vacuuming under reduced pressure Finally, add 0.2g organic bismuth catalyst, continue to heat up to 185°C at a rate of 3°C / min, and stop heating for 8 hours for constant temperature polycondensation reaction. After cooling down, the product is dissolved in chloroform, and then precipitated with absolute ethanol. After the treatment, 38 g of hydroxyl-terminated polybutylene lactate was obtained.
[0107] Add 28g of polybutylene lactate and 7g of polybutylene succinate into a 500ml four-neck flask, mix at 128°C to form a molten mixture, then vacuum dry for 1.5 hours, and cool to 58°C; Add a dibasic isocyanate mixture containing 25 g of isophorone diisocyanate and 9 g of hexamethylene diisocyanate into a four-neck flask to form a raw m...
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