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A kind of 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 grease, the TPU film has poor permeability and poor moisture permeability, etc. The expansion ratio is easy to control and the cost is low

Active Publication Date: 2022-03-08
SHANGHAI HENGAN POLYURETHANE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the TPU film has good waterproof performance, the permeability of the TPU film to small molecular substances such as oxygen and water vapor is generally poor. Polyester / polyether diols and chemically bonded hydrophilic functional groups, or the use of physical techniques such as electrospinning and air spinning to prepare microporous or non-porous TPU films, although these techniques make TPU films exhibit a certain degree of hydrophilicity However, there are disadvantages such as hydrophilicity, poor moisture permeability and not lasting, and the microporous structure is easily polluted by dust and sweat oil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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, 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, 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 stir for 1...

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

The invention belongs to the field of preparation of thermoplastic polyurethane films, in particular to a preparation method of moisture-permeable thermoplastic polyurethane films. It reacts citric acid and diol, adds gallic acid, and then adds a catalyst to react to obtain a hyperbranched polyester polyol with a large number of hydrophilic groups; The non-porous thermoplastic polyurethane film with good moisture permeability is prepared by adjusting the thickness, molding temperature and relative temperature of the film through blown film forming process. The hyperbranched polyester polyol prepared by the invention has a high degree of branching, a large number of hydrophilic groups at the end, adopts a more economical blow molding process, and has a simple synthesis process. The thermoplastic polyurethane film prepared by this process has good hydrophilicity, mechanical properties and moisture permeability, and has application value in medical supplies, clothing, home furnishing, food packaging and other fields.

Description

Technical field: [0001] The invention belongs to the field of preparation of thermoplastic polyurethane films, in particular to a preparation method of moisture-permeable thermoplastic polyurethane films. Background technique: [0002] Thermoplastic polyurethane film (referred to as TPU film), mainly made of diisocyanate or polyester / polyether diol as a raw material, is an elastic block copolymer composed of a flexible soft segment region and a rigid functional group hard segment region. This special chemical structure not only endows it with excellent mechanical properties and wear resistance, but also has good toughness, oil resistance, corrosion resistance and other advantages. It is a mature environmental protection material. , Food packaging and other fields are widely used. Although the TPU film has good waterproof performance, the permeability of the TPU film to small molecular substances such as oxygen and water vapor is generally poor. Polyester / polyether diols an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/42C08G18/32C08J5/18C08L75/06C08G63/668
CPCC08G18/755C08G18/664C08G18/4252C08G18/10C08G63/668C08J2375/06C08G18/3206
Inventor 贾润萍刘宝全任静宇史继超郜峰杨朴
Owner SHANGHAI HENGAN POLYURETHANE CO LTD
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