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Chopped fiber bundle, molding material, and fiber reinforced plastic, and process for producing them

A technology for chopped fibers and molding materials, which is applied in the field of fiber reinforced plastics and molding materials for molding fiber reinforced plastics, can solve the problems of increased production costs of SMC sheets, uneven distribution of reinforcing fibers, and reduced mechanical properties of molded bodies.

Active Publication Date: 2010-05-19
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in general, in order to meet the amount of reinforcing fibers required in the molded body and reduce the number of reinforcing fibers in the chopped fiber bundles, more chopped fiber bundles are required, resulting in an increase in the production cost of the SMC sheet
On the other hand, since the fine chopped fiber bundles in which the number of reinforcing fibers is reduced are easily aggregated with each other, uneven distribution or uneven orientation of the reinforcing fibers tends to occur in the molded body, and the mechanical properties of the obtained molded body are lowered. The problem

Method used

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  • Chopped fiber bundle, molding material, and fiber reinforced plastic, and process for producing them
  • Chopped fiber bundle, molding material, and fiber reinforced plastic, and process for producing them
  • Chopped fiber bundle, molding material, and fiber reinforced plastic, and process for producing them

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0264] As the continuous reinforcing fiber bundle, a continuous reinforcing fiber bundle composed of a plurality of substantially untwisted and unsized carbon fibers is used. The diameter of the reinforcing fiber (monofilament) was 7 μm, the number of reinforcing fibers was 12,000, the tensile strength of the reinforcing fiber bundle was 5.0 GPa, and the tensile modulus of the reinforcing fiber bundle was 240 GPa. The continuous reinforcing fiber bundles are continuously immersed in the sizing agent mother liquor, the sizing agent is given to the continuous reinforcing fiber bundles so that the resin content is 2.0% by mass, and the reactive polyurethane resin emulsion is diluted with purified water in the sizing agent mother liquor (the first industry Pharmaceutical Co., Ltd. product, Superflex-R5000). The continuous reinforcing fiber bundle to which the sizing agent was applied was dried with a hot roll at 150° C. and a drying oven at 200° C. under a dry tension of 600 g / dte...

Embodiment 2

[0273] When cutting the same continuous reinforcing fiber bundles as in Example 1 to obtain chopped fiber bundles, knife edges were provided at intervals of 12.5 mm in the circumferential direction of the rotary cutter, and the continuous reinforcing fiber bundles were inserted at an angle of 30° to the knife edges. The resulting chopped fiber bundle is figure 2 Chopped fiber bundle CFB2 in the form shown. The sides 16a and 16b at the end of the chopped fiber bundle CFB2 have a linear form at an angle of 30° to the arrangement direction of the reinforcing fibers 11, the fiber length Lf of the reinforcing fibers 11 is 25mm, although 2% left and right differences. There are transition zones 13a and 13b where the number of reinforcing fibers increases in the arrangement direction of the reinforcing fibers 11 from the end to the center of the chopped fiber bundle CFB2, and the number of reinforcing fibers in the arrangement direction of the reinforcing fibers is 1,300 per mm. I...

Embodiment 3

[0278] As the continuous reinforcing fiber bundle, a continuous reinforcing fiber bundle (RS570M-521ZS, fiber basis weight 570 tex, manufactured by Nittobo Co., Ltd.) composed of a plurality of glass fibers adhered with a sizing agent was used. The continuous reinforcing fiber bundle was pulled out in an untwisted state from the copper tube by unwinding in the transverse direction, and cut in the same manner as in Example 1 to obtain a chopped fiber bundle. The resulting chopped fiber bundle is figure 2 Chopped fiber bundle CFB2 in the form shown. The sides 16a and 16b at the ends of the chopped fiber bundle CFB2 have a linear form at an angle of 12° to the direction in which the reinforcing fibers 11 are arranged, and the fiber length Lf of the reinforcing fibers 11 is 25 mm. % of the difference. From the end to the center of the chopped fiber bundle CFB2, there are transition zones 13a and 13b where the number of reinforcing fibers increases in the arrangement direction o...

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Abstract

This invention provides a chopped fiber bundle comprising a large number of unidirectionally arranged reinforced fibers. The length of each of the reinforced fibers is in the range of 5 to 100 mm. The chopped fiber bundle has a transition segment in which the number of the reinforced fibers increases toward the central part of the chopped fiber bundle in the aligned direction of the reinforced fibers with both ends in the aligned direction of the reinforced fibers in the chopped fiber bundle being a starting point. The level of a change in total sectional area of the large number of reinforced fibers is not more than 0.05 mm2 per mm in the aligned direction of the reinforced fibers over the whole area in the longitudinal direction of the chopped fiber bundle.

Description

technical field [0001] The present invention relates to a chopped fiber bundle composed of a plurality of reinforcing fibers. The present invention also relates to a molding material for molding fiber-reinforced plastics, the molding material being composed of an aggregate of a plurality of chopped fiber bundles of the present invention. The present invention also relates to a fiber-reinforced plastic composed of an aggregate of a plurality of chopped fiber bundles of the present invention and a matrix resin. Background technique [0002] Fiber-reinforced plastics composed of multiple reinforcing fibers and matrix resin have attracted much attention in industrial applications due to their high specific strength and specific modulus, excellent mechanical properties, and high functional properties such as weather resistance and chemical resistance. Its demand is also increasing year by year. [0003] As a method of molding fiber-reinforced plastics with high functional prope...

Claims

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Application Information

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IPC IPC(8): C03B37/16B29B15/14B29C39/10B29C43/18C03C25/10D06M15/564B29K105/20B29K105/14
CPCB29C70/22B29B15/105B29C70/14C08J2375/04C08J5/042B29C70/305C03B37/16C03C25/24Y02P40/57Y10T156/1084Y10T428/24132Y10T428/24Y10T428/298Y10T428/24058Y10T428/269Y10T83/04
Inventor 武田一朗和田原英铺佐藤成道
Owner TORAY IND INC
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