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A kind of preparation method of polylactic acid/thermoplastic polyurethane composite film

A thermoplastic polyurethane and composite film technology, applied in the field of thermoplastic polyurethane composite film preparation, can solve the problems of poor wear resistance of TPU film, unsuitable for industrial production, poor moisture permeability and air permeability, etc. Good hydrophilicity, stability and mechanical strength

Active Publication Date: 2022-06-28
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 the above excellent properties, the traditional TPU film has poor wear resistance, low hydrophilicity, and poor moisture permeability, which limits its application in many fields.
At present, most of the research is to improve its comprehensive performance by modifying TPU or blending TPU with other inorganic compounds and polymers. Although the TPU composite film shows a certain degree of hydrophilicity to a certain extent, there are hydrophilic and moisture-permeable properties. Poor air permeability, not durable, not suitable for industrial production and other shortcomings, therefore, by improving the chemical structure of TPU, providing more hydrophilic groups, and adopting a certain molding process with other polymers, to prepare a good moisture permeability TPU composite film with air permeability, strong stability and excellent mechanical properties

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, heated to 140 °C, introduced with nitrogen, and stirred for 2 h; then added 3 kg of Gallic acid was stirred at 120 °C for 2 h, 0.05 kg of p-toluenesulfonic acid was added, and the stirring was continued for 1.5 h. During this period, the reaction system was evacuated for about 5 min every 0.5 h to remove small molecular by-products, until the weight of the reaction system was not obvious. After the change, stop the reaction to obtain the 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, respectively; 3 kg of the prepared hyperbranched polyester polyol was added to a three-necked flask equipped with a stirring device. , heated to 120 °C, vacuumed and dehydrated for 1.5 h, cooled to 80 °C, added molten a...

Embodiment 2

[0029] Put 1 kg of citric acid and 3 kg of polyethylene glycol 200 into a three-neck round-bottomed flask equipped with a nitrogen inlet, a thermometer and a mechanical stirrer, heat it to 140 °C, pass nitrogen, and stir for 2 h; then add 3 kg Gallic acid was stirred at 120 °C for 2 h, 0.05 kg of p-toluenesulfonic acid was added, and the stirring was continued for 1.5 h. During this period, the reaction system was evacuated for about 5 min every 0.5 h to remove small molecular by-products, until the weight of the reaction system was not obvious. After the change, stop the reaction to obtain the hyperbranched polyester polyol;

[0030]3 kg of isophorone diisocyanate and 1.5 kg of 1,4-butanediol were dewatered under vacuum at 60 °C for 1 h, respectively; 3 kg of the prepared hyperbranched polyester polyol was added to a three-necked flask equipped with a stirring device. , heated to 120 °C, vacuumed and dehydrated for 1.5 h, cooled to 80 °C, added molten and dewatered isophorone...

Embodiment 3

[0034] Put 1 kg of citric acid and 3.5 kg of polyethylene glycol 200 into a three-neck round-bottomed flask equipped with a nitrogen inlet, a thermometer and a mechanical stirrer, heat to 140 °C, pass nitrogen, and stir for 2 h; then add 3 kg Gallic acid was stirred at 120 °C for 2 h, 0.05 kg of p-toluenesulfonic acid was added, and the stirring was continued for 1.5 h. During this period, the reaction system was evacuated for about 5 min every 0.5 h to remove small molecular by-products, until the weight of the reaction system was not obvious. After the change, stop the reaction to obtain the hyperbranched polyester polyol;

[0035] 3 kg of isophorone diisocyanate and 1.5 kg of 1,4-butanediol were dewatered under vacuum at 60 °C for 1 h, respectively; 3 kg of the prepared hyperbranched polyester polyol was added to a three-necked flask equipped with a stirring device. , heated to 120 °C, vacuumed and dehydrated for 1.5 h, cooled to 80 °C, added with melted and dewatered isoph...

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Abstract

The invention relates to the field of preparation of a thermoplastic polyurethane composite film, in particular to a preparation method of a polylactic acid / thermoplastic polyurethane (abbreviated as PLA / TPU) composite film. It reacts self-made hyperbranched polyester polyol with a large number of hydrophilic groups with diisocyanate and small molecule chain extender to prepare thermoplastic polyurethane with good hydrophilicity, and then blends and melts it with dried polylactic acid, and passes through The blown film forming process adjusts the film thickness, forming temperature and relative temperature to prepare a non-porous, moisture-permeable and air-permeable PLA / TPU composite film composite film. The invention can effectively improve the performance of the composite film by blending polylactic acid and thermoplastic polyurethane with good hydrophilicity to blow the film, the thickness of the film is controllable, and the non-porous moisture-permeable and breathable film with good mechanical strength and stable chemical properties can be prepared. Composite film materials can be widely used in medical supplies, clothing, home furnishing, food packaging and other fields.

Description

technical field [0001] The invention relates to the field of preparation of thermoplastic polyurethane composite films, in particular to a preparation method of a polylactic acid / thermoplastic polyurethane (PLA / TPU for short) composite film. Background technique [0002] Thermoplastic polyurethane film (referred to as TPU film) is an elastic block copolymer composed of a flexible soft segment area and a rigid functional group hard segment area, which is processed by a film forming process. TPU film not only has excellent properties of high tension, toughness and aging resistance, but also is a mature non-toxic and environmentally friendly material, which is widely used in shoe materials, medical products, fitness equipment, home improvement, building materials and other fields. Although TPU films have the above excellent properties, traditional TPU films have poor abrasion resistance, low hydrophilicity, and low moisture and breathability, which limit their application in ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/06C08L67/04C08J5/18C08G18/75C08G18/66C08G18/42C08G18/32C08G18/10
CPCC08J5/18C08G18/755C08G18/42C08G18/10C08J2375/06C08J2467/04C08G18/3206
Inventor 贾润萍刘宝全段延捷吴丹丹郜峰杨朴
Owner SHANGHAI HENGAN POLYURETHANE CO LTD
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