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Polyurethane composition for film and its use

A technology of polyurethane and composition, which is applied in the field of polyurethane composition for film and its application in film composite products, and can solve problems such as unsatisfactory process and product performance, high thermal bonding temperature, and easy occurrence of adhesion, etc., to achieve Meet the requirements of the thermal bonding process, change the melting point, and maintain the integrity of the effect

Active Publication Date: 2007-06-13
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the general thermoplastic polyurethane has a high melting point, the prepared film is relatively soft, and the thermal bonding temperature is high. When the composite material is prepared by hot melting at a relatively high temperature, it is easy to cause adhesion, which cannot meet the requirements of the process and product performance. , it is necessary to modify the polyurethane material so that it can meet the needs of preparing different composite products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The polyurethane composition for film of the present invention is composed of 80% of polyurethane raw material and 20% of low melting point nylon.

[0045] A thermoplastic polyurethane raw material with a Shore A hardness of 85 and a density of 1.12 g / cm 3 , produced by BASF.

[0046] A total of 20% of low-melting-point nylon was added to the above-mentioned raw materials, the melting point of which was 95° C., and the place of production was China Academy of Textile Sciences.

[0047] The processing equipment and bonding process are the same as those of the comparative example, and the peel strength and moisture permeability between the polyurethane film and the cloth base are measured according to the test method. The hot air temperature is 370°C, the peel strength between the polyurethane film layer and the cloth base is 3.6N / cm, and the overall moisture permeability of the composite product is 300g / 24h.m 2 .

Embodiment 2

[0049] The polyurethane composition for film of the present invention is composed of 80% of polyurethane raw material and 20% of low-melting point polyester.

[0050] A polyurethane raw material with a Shore A hardness of 85 and a density of 1.12g / cm 3 , produced by BASF. Add 20% low-melting point polyester in total to the above raw materials, slice viscosity [η] ≥ 0.55, melting point 110°C, and the place of production is China Academy of Textile Sciences. Mix well and add to extruder.

[0051] The processing temperature of each section of the extruder is 140° C., 150° C., and 150° C. to prepare a polyurethane film.

[0052] The prepared film was thermally bonded to the cloth base by hot air welding equipment, and then the peel strength and moisture permeability were measured. The temperature of the hot air flow is 380°C, the measured peel strength is 3.2N / cm, and the moisture permeability is 885g / 24h.m 2 , The tensile strength is 29Mpa.

Embodiment 3

[0054] The film of the invention is composed of polyurethane raw materials and low-melting point polyester raw materials.

[0055] Polyurethane raw material with a Shore A hardness of 85 and a density of 1.12g / cm 3 , is a polyether polyurethane produced by Goodland Corporation of the United States. Low melting point polyester raw material, slice viscosity [η] ≥ 0.55, melting point 110°C, produced by China Academy of Textile Sciences.

[0056] This example shows that by controlling the blending ratio of the two raw materials, the cohesive force and moisture permeability of the polyurethane film and the base cloth have different values.

[0057] The polyester and polyurethane raw materials are respectively added into the extruder according to different proportions, and the processing conditions of the extruder are adjusted according to the different proportions of the blends to prepare a film.

[0058] The above-mentioned films were bonded to the cloth base respectively by mea...

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Abstract

Disclosed is a polyurethane composition in film membrane use, comprising thermoplastic polyurethane with 95%~50% in mass and modifier with 5%~50% in mass; also discloses the application of the polyurethane composition in coextruded film preparing. The polyurethane coating in said polyurethane film membrane composition can be prepared by heat bonding between the film membrane formed by raw material and base material; also can by coating the raw material directly on the base and then for the heat bonding. The material is characterized in that it can not only change the fusing point of the film material, which can meet demand in heat bonding process; but can also modifies the strip power between the thin layer of polyurethane and other base material and control the water vapour permeability of the composite product of this kind.

Description

technical field [0001] The invention relates to a polyurethane composition, in particular to a polyurethane composition for film and its application in film composite products. Background technique [0002] At present, people have higher and higher requirements on the comprehensive performance of textile fabrics, and the lamination of textiles is an important means to obtain special properties of textiles, so as to achieve high performance and high added value. In a single-layer fabric, it is difficult to include many properties such as strength, elasticity, durability, comfort, and aesthetics. It is very difficult to develop a single-layer fabric with several properties, the process is complicated, and the cost is too high. Technology Bonding two or more layers of fabrics together or bonding fabrics with polymer films and other flexible materials, combining various useful properties of fabrics to form composites with multiple functions . This lamination method is one of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08J5/18
Inventor 罗欣迟克栋朱俊伟
Owner CHINESE TEXTILE ACAD