Preparation method of polylactic acid/thermoplastic polyurethane composite film
A thermoplastic polyurethane and composite film technology, which is applied in the field of preparation of polylactic acid/thermoplastic polyurethane composite film, can solve the problems of poor wear resistance of TPU film, not suitable for industrial production, poor moisture permeability and air permeability, etc., and achieve enhanced hydrophilicity Good hydrophilicity and stability, good mechanical strength
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Embodiment 1
[0024] Put 1 kg of citric acid and 2.5 kg of polyethylene glycol 200 into a three-necked round-bottomed flask equipped with a nitrogen inlet, a thermometer and a mechanical stirrer, heat to 140 ° C, feed nitrogen, and stir for 2 hours; then add 3 kg of gallic acid, Stir at 120°C for 2 hours, add 0.05kg of p-toluenesulfonic acid, continue to stir for 1.5 hours, during which the reaction system is vacuumed for about 5 minutes every 0.5 hours to remove small molecular by-products, until the weight of the reaction system does not change significantly, stop Reaction, obtains described hyperbranched polyester polyol;
[0025] 3 kg of isophorone diisocyanate and 1.5 kg of 1,4-butanediol were dewatered under vacuum at 60°C for 1 h; 3 kg of the prepared hyperbranched polyester polyol was added to a three-necked flask equipped with a stirring device, and heated Vacuum dehydrate at 120°C for 1.5h, cool down to 80°C, add melted and dehydrated isophorone diisocyanate and stir for 1h, conti...
Embodiment 2
[0029] Put 1 kg of citric acid and 3 kg of polyethylene glycol 200 into a three-necked round-bottomed flask equipped with a nitrogen inlet, a thermometer and a mechanical stirrer, heat to 140 ° C, feed nitrogen, and stir for 2 h; then add 3 kg of gallic acid, and Stir at 120°C for 2 hours, add 0.05kg of p-toluenesulfonic acid, and continue stirring for 1.5 hours. During this period, vacuumize the reaction system for about 5 minutes at intervals of 0.5 hours to remove small molecular by-products. Stop the reaction until the weight of the reaction system does not change significantly. , obtaining the hyperbranched polyester polyol;
[0030] 3 kg of isophorone diisocyanate and 1.5 kg of 1,4-butanediol were dewatered in vacuum at 60°C for 1 h; 3 kg of the prepared hyperbranched polyester polyol was added to a three-necked flask equipped with a stirring device, and heated Vacuum dehydrate at 120°C for 1.5h, cool down to 80°C, add melted and dehydrated isophorone diisocyanate and st...
Embodiment 3
[0034] Put 1kg of citric acid and 3.5kg of polyethylene glycol 200 into a three-necked round-bottomed flask equipped with a nitrogen inlet, a thermometer and a mechanical stirrer, heat to 140°C, blow in nitrogen, and stir for 2 hours; then add 3kg of gallic acid, Stir at 120°C for 2 hours, add 0.05kg of p-toluenesulfonic acid, continue to stir for 1.5 hours, during which the reaction system is vacuumed for about 5 minutes every 0.5 hours to remove small molecular by-products, until the weight of the reaction system does not change significantly, stop Reaction, obtains described hyperbranched polyester polyol;
[0035] 3 kg of isophorone diisocyanate and 1.5 kg of 1,4-butanediol were dewatered in vacuum at 60°C for 1 h; 3 kg of the prepared hyperbranched polyester polyol was added to a three-necked flask equipped with a stirring device and heated to Vacuum dehydration at 120°C for 1.5h, lower the temperature to 80°C, add melted and dehydrated isophorone diisocyanate and stir fo...
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