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Polyimide nonwoven fabric and process for production thereof

A manufacturing method, polyimide technology, applied in the field of non-woven fabrics, can solve problems such as insufficient thermal dimensional stability

Inactive Publication Date: 2009-07-01
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But they cannot sufficiently satisfy the thermal dimensional stability such as the linear expansion coefficient required in the field of use

Method used

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  • Polyimide nonwoven fabric and process for production thereof
  • Polyimide nonwoven fabric and process for production thereof
  • Polyimide nonwoven fabric and process for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0141] The present invention will be described below using examples, but the present invention is not limited by these examples. In addition, the evaluation items in each of the following Examples were implemented according to the method described below.

[0142]

[0143] The solution obtained by dissolving the polymer in N-methyl-2-pyrrolidone was maintained at 30° C. so that the polymer concentration was 0.2 g / dl, and measured using an Ubbelohde viscosity tube.

[0144]

[0145] A scanning electron micrograph (magnification: 5000 times) of the surface of the obtained nonwoven fabric was photographed, and the average value of the fiber diameters measured by n=10 was calculated from the photograph.

reference example 1

[0147] (Preparation of polyamic acid solution)

[0148] Nitrogen replacement was carried out in a reaction vessel in which the liquid-contacting part of the container equipped with a nitrogen gas introduction tube, a thermometer, and a stirring rod, and the piping for infusion were made of austenite stainless copper SUS3 16L, and then 5-amino-2-( 223 parts by mass of p-aminophenyl) benzoxazole, 4448 parts by mass of N,N-dimethylacetamide, completely dissolved, and then 217 parts by mass of pyromellitic dianhydride was added, at a reaction temperature of 25°C Under stirring for 24 hours, brown viscous polyamic acid solution A1 was obtained. Its ηsp / C was 4.0dl / g.

reference example 2

[0150] (Preparation of polyamic acid solution)

[0151] Nitrogen replacement was carried out in a reaction vessel in which the liquid-contacting part of the container equipped with a nitrogen gas introduction tube, a thermometer, and a stirring rod, and the piping for infusion were made of austenite stainless copper SUS3 16L, and then 200 parts by mass of diaminodisulfide was added. Phenyl ether. Next, add 4202 parts by mass of N-methyl-2-pyrrolidone to dissolve it completely, then add 217 parts by mass of pyromellitic dianhydride, and stir at 25°C for 5 hours to obtain a brown viscous poly Amic acid solution B. Its relative viscosity (ηsp / C) was 3.7dl / g.

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Abstract

The invention provides a nonwoven fabric which exhibits excellent heat resistance, mechanical strength and dimensional stability under heat even in applications accompanied with the exposure to high temperature and has an extremely large surface area and high filter performance. The fabric is made of polyimide fibers which are prepared from a raw material comprising as the essential components an aromatic tetracarboxylic acid and antissu non tisse de peo aromatic diamine having a benzoxazole structure through polycondensation and have fiber diameters of 0.001 to 1[mu]m. This fabric can be produced by a process which comprises the step of forming a polyimide precursor nonwoven fabric by charge-spinning a polyamic acid prepared from a raw material comprising as the essential components an aromatic tetracarboxylic acid and an aromatic diamine having a benzoxazole structure through polycondensation and the step of subjecting the polyimide precursor fibers constituting the obtained precursor nonwoven fabric to imidation.

Description

technical field [0001] The present invention relates to a nonwoven fabric having a low coefficient of linear expansion formed of polyimide fibers with a fiber diameter of 0.001 to 1 μm and a method for producing the same. Specifically, the present invention relates to a nonwoven fabric obtained from a polyimide obtained by polycondensing at least aromatic tetracarboxylic acids and an aromatic diamine having a benzoxazole structure. Background technique [0002] In recent years, higher heat resistance, mechanical properties and electrical characteristics. The reason is that, for example, in the field of electronics, with the reduction in size, weight, and high-density wiring of mobile phones and personal computers, the miniaturization of internal devices and rechargeable batteries is promoted, and the internal heat storage temperature during use continues to increase. In order to solve such problems, polyimide resins have been developed and utilized in various forms such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/42B01D39/16D04H1/72D04H1/4334D04H1/4382D04H1/728
CPCD04H1/72D04H1/42D01D5/0038D04H3/16D01F6/74D04H1/4334Y10T442/626D04H1/43838D04H1/728
Inventor 中森雅彦前田乡司北河享小林久人大田康雄
Owner TOYOBO CO LTD
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