Preparation method of moisture-permeable thermoplastic polyurethane film
A thermoplastic polyurethane and film technology, which is applied in the field of thermoplastic polyurethane film preparation, can solve the problems that the microporous structure is easily polluted by dust and sweat oil, the TPU film has poor permeability and poor moisture permeability, etc. The expansion ratio is easy to control and the cost is low
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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, blow in nitrogen, and stir for 2 hours; then add 3 kg of gall acid, stirred at 120°C for 2 hours, added 0.05kg of p-toluenesulfonic acid, continued to stir for 1.5 hours, during which the reaction system was evacuated for about 5 minutes every 0.5 hours to remove small molecular by-products, until the weight of the reaction system did not change significantly , stop reaction, obtain described hyperbranched polyester polyol;
[0025] First, 3 kg of isophorone diisocyanate and 1.5 kg of 1,4-butanediol were dewatered at 60°C for 1 hour in a vacuum; 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 sti...
Embodiment 2
[0029] Put 1.5kg of citric acid and 3kg of polyethylene glycol 200 by weight 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 gall acid, stirred at 120°C for 2 hours, added 0.05kg of p-toluenesulfonic acid, continued to stir for 1.5 hours, during which the reaction system was evacuated for about 5 minutes every 0.5 hours to remove small molecular by-products, until the weight of the reaction system did not change significantly , stop reaction, obtain described hyperbranched polyester polyol;
[0030] First, 3 kg of isophorone diisocyanate and 1.5 kg of 1,4-butanediol were dewatered at 60°C for 1 hour in a vacuum; 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 ...
Embodiment 3
[0034]Put 1.5kg of citric acid and 3.5kg of polyethylene glycol 200 into a three-neck round bottom 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 , stirred at 120°C for 2 hours, added 0.05kg of p-toluenesulfonic acid, and continued to stir for 1.5 hours. During this period, the reaction system was vacuumed for about 5 minutes every 0.5 hours to remove small molecule by-products until the weight of the reaction system did not change significantly. Stop reaction, obtain described hyperbranched polyester polyol;
[0035] First, 3 kg of isophorone diisocyanate and 1.5 kg of 1,4-butanediol were dewatered at 60°C for 1 hour in a vacuum; 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...
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Abstract
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