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Carbon fiber composite material

A composite material and carbon fiber technology, applied in the field of carbon fiber composite materials, can solve the problems of large fluctuation, low mechanical properties, poor molding followability, etc., and achieve the effect of small fluctuation of mechanical properties, excellent followability, high fluidity and mechanical properties.

Inactive Publication Date: 2014-10-08
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as described in this Patent Document 2, carbon fiber composite materials with thick carbon fiber bundles and a high ratio of bundles have high fluidity and excellent moldability when using them to prepare molded articles, but carbon fibers have a negative effect on ribs and fine shapes. Poor molding followability, low mechanical properties, and large fluctuations

Method used

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  • Carbon fiber composite material
  • Carbon fiber composite material
  • Carbon fiber composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] The carbon fiber bundle (A) is cut into a fiber length of 10mm, and the cut carbon fiber bundle and nylon 6 short fiber (the short fiber fineness is 1.7dtex, the cut length is 51mm, and the number of crimps is 90:10 in mass ratio) 12 pieces / 25mm, the crimp rate is 15%) mixed, put into the carding device. The resulting fiber webs are cross lapped to form a fabric with a weight per unit area of ​​100 g / cm formed by carbon fibers and nylon 6 fibers. 2 sheets of carbon fiber aggregates.

[0117] Taking the winding direction of the sheet-like carbon fiber aggregate as 0°, it becomes (0° / 90° / 0° / 90° / 0° / 90°) s 12 sheets of carbon fiber aggregates were laminated in the same way, and then the laminated carbon fiber aggregates were laminated with nylon resin melt-blown non-woven fabric (“CM1001”, ηr=2.3, manufactured by Toray Co., Ltd.) to make carbon fibers The volume ratio to the thermoplastic resin was 25:75, and the whole was clamped by stainless steel plates, preheated at 2...

Embodiment 2～10

[0120] About Example 1, except having changed conditions as shown in Table 1, it carried out similarly to Example 1, and obtained the flat plate of a carbon fiber composite material. Table 1 shows conditions, measurements, and evaluation results together.

Embodiment 11

[0122] The carbon fiber bundle (B) is cut into a fiber length of 15mm, and the cut carbon fiber bundle and polypropylene staple fiber (the short fiber fineness is 1.7dtex, the cut length is 51mm, and the number of crimps is 90:10 in mass ratio) 12 pieces / 25mm, crimp rate 15%) mixed to form a unit area weight of 100g / cm formed by carbon fiber and polypropylene fiber 2 A sheet-like carbon fiber aggregate, laminated polypropylene resin melt-blown non-woven fabric ("J709QG", MFR=55g / 10min, Prime Polymer Co., Ltd.), so that the volume ratio of carbon fiber to thermoplastic resin reaches 25: 75, except for this, it is the same as Example 1. Table 2 shows conditions, measurements, and evaluation results.

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Abstract

Provided is a carbon fiber composite material characterized in that: the material is made of carbon fibers and a thermoplastic resin; the proportion Y, relative to the total weight of carbon fibers, of a carbon fiber bundle (1) for which Mn / (Ln*D) is 8.5*10-1 (mg / mm2) or more, is 30 wt% or more and less than 90 wt%; the average value X of Mn / Ln for the carbon fiber bundle (1) is from 1.1*10-2 (mg / mm) to 8.1*10-2 (mg / mm); and satisfies Y >= 100X+30. Therein, Mn: total weight of carbon fiber bundle, Ln: length of carbon fibers, D: diameter of carbon fibers. Obtained is a carbon fiber composite material that combines high flowability and mechanical properties, has few variations in mechanical properties and shows superior adaptability for small areas such as ribs etc.

Description

technical field [0001] The present invention relates to a carbon fiber composite material, and in particular to a carbon fiber composite material capable of achieving both high fluidity and mechanical properties when a molded article is produced using the carbon fiber composite material. Background technique [0002] Carbon fiber composite materials composed of carbon fibers and thermoplastic resins are used in the production of various molded products, and various proposals have been made to achieve high mechanical properties of the produced molded products and good fluidity during production. For example, Patent Document 1 proposes a composite material in which the ratio of a specific carbon fiber bundle to the total amount of fibers in a carbon fiber composite material is controlled at a low level, and the average number of fibers in the specific carbon fiber bundle is within a specific range. Material. [0003] However, as described in this patent document 1, the carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/06
CPCC08K7/06C08J5/042
Inventor 三好且洋嶋田刚司桥本贵史小原彻也饭塚智规中岛省二
Owner TORAY IND INC