Flame-resistant acrylic fiber nonwoven fabric, carbon fiber nonwoven fabric, and method for production thereof

A non-woven fabric, acrylonitrile-based technology, used in non-woven fabrics, textiles and papermaking, etc., can solve the problems of low density, low bending elastic modulus, dry electrolyte membrane, etc., and achieve the effect of thin thickness and dense structure

Inactive Publication Date: 2005-11-30
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low bending elastic modulus of the porous conductive sheet, it can cause narrowing of the gas passage of the separator
In addition, because of its large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0216] Set the density to 1.41g / cm 3 The acrylonitrile-based fibers were crimped and then cut into fibers having a length of 51 mm to obtain staple fibers of acrylonitrile-oxide fibers. The short fibers of the obtained acrylonitrile-based fibers are carded, and the number of laminated sheets of the fiber sheets obtained by carding is adjusted so that the weight per square meter is the value described later, and then the laminated material is subjected to hydro-entanglement treatment to obtain Acrylonitrile-based fiber nonwoven fabric.

[0217] The obtained acrylonitrile-based fiber nonwoven fabric was passed through a roller press at a speed of 2 m / min, and pressed in the thickness direction at a temperature of 200° C. and a linear pressure of 50 kgf / cm. The weight per square meter of oxidized acrylonitrile fiber nonwoven fabric after pressurization is 102g / m 2 (Example 1), 127g / m 2 (Example 2), 170g / m 2 (Embodiment 3). Table 1 lists the pressing conditions in the product...

Embodiment 4-7

[0225] The acrylonitrile-based fiber nonwoven fabric of Comparative Example 2 was passed through a roller press at a speed of 2 m / min, and pressed in the thickness direction at the temperature and linear pressure shown in Table 1. Table 1 lists the pressing conditions in the production process and the various characteristic values ​​(weight per square meter, thickness, density, thickness change due to compression) of the obtained acrylonitrile-based fiber nonwoven fabric.

Embodiment 8 and 9

[0227] At the temperature and plane pressure shown in Table 1, the nonwoven fabric of acrylonitrile-based fibers of Comparative Example 6 was pressed in the thickness direction. Table 1 lists the pressing conditions in the production process and the various characteristic values ​​(weight per square meter, thickness, density, thickness change due to compression) of the obtained acrylonitrile-based fiber nonwoven fabric.

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Abstract

A nonwoven fabric comprising flame-retardant acrylic fibers, characterized in that it has a weight per square-meter of 70 to 190 g/m<2>, a thickness of 0.1 to 0.3 mm, a density of 0.35 to 0.8 g/cm<3>; and a nonwoven fabric comprising carbon fibers, characterized in that it has a weight per square-meter of 50 to 150 g/m<2>, a thickness of 0.1 to 0.25 mm, a density of 0.3 to 0.7 g/cm<3>, a surface roughness Ra of 30 mu m or less, a tensile strength of 0.2 kgf/cm or more, and a maximum fracture radius being defined in the specification of 20 mm or less. Said carbon fiber nonwoven fabric is produced by subjecting the flame-retardant acrylic fiber nonwoven fabric to a carbonization treatment and can be suitably used as a material for forming an electrode of a fuel cell.

Description

technical field [0001] The invention relates to acrylonitrile-based fiber non-woven fabrics, carbon fiber non-woven fabrics and production methods thereof. In addition, the present invention also relates to an electrode, an electrode diffusion layer, a fuel cell unit, and a fuel cell formed by using the carbon fiber nonwoven fabric of the present invention as an electrode material. [0002] The nonwoven fabric of acrylonitrile-based fibers of the present invention is characterized by dense structure and thin thickness. The carbon fiber nonwoven fabric of the present invention is also characterized by dense structure and thin thickness. [0003] The acrylonitrile-based fiber nonwoven fabric of the present invention can be preferably used to produce the carbon fiber nonwoven fabric of the present invention. The carbon fiber nonwoven fabric of the present invention can be preferably used as an electrode diffusion layer of a solid polymer fuel cell. Background technique [00...

Claims

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Application Information

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IPC IPC(8): D04H1/4242D04H1/43D04H1/74
Inventor 井上干夫千田崇史冈田贤也礒井伸也
Owner TORAY IND INC
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