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Sizing agent, reinforcing fiber bundle, fiber-reinforced resin forming material, and fiber-reinforced composite material

A technology of reinforcing fiber and sizing agent, applied in the direction of epoxy resin coating, carbon fiber, fiber treatment, etc., can solve the problem that the split tow is not fully integrated, and achieve the effect of excellent cutting performance

Pending Publication Date: 2021-01-29
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the sub-bundles of the carbon fiber bundle are not sufficiently integrated with each other, some of the sub-bundles may be separated during production or processing of the carbon fiber bundle, and entanglement on rollers or the like may occur.

Method used

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  • Sizing agent, reinforcing fiber bundle, fiber-reinforced resin forming material, and fiber-reinforced composite material
  • Sizing agent, reinforcing fiber bundle, fiber-reinforced resin forming material, and fiber-reinforced composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0172]

[0173] Will be mixed with the epoxy resin of the component (A-1) 62 mass parts and component (A-2) 13 mass parts as component (A), component (B-1) 10 mass parts and surfactant (C-1 ) 15 parts by mass were mixed to obtain a sizing agent. Ion-exchanged water was added to the above-mentioned sizing agent, and an aqueous dispersion having a concentration of the sizing agent of 30% by mass was prepared by phase inversion emulsification using a homomixer.

[0174]

[0175] The acrylonitrile-based copolymer was wet spun to obtain a carbon fiber bundle precursor having 3,000 filaments and a total fineness of 3,600 tex, and 5 bundles of the carbon fiber bundle precursor were bundled and wound on a bobbin. The bundled carbon fiber bundle precursor was fired to obtain a carbon fiber bundle including 5 individual tows, a total number of filaments of 15,000, and a total fineness of 1,000 tex. Next, the carbon fiber bundle was electrolytically oxidized using ammonium bicarbona...

Embodiment 2～12

[0177] Except having changed the composition of a sizing agent and the adhesion amount of a sizing agent as shown in Table 1, it carried out similarly to Example 1, and produced the carbon fiber bundle with a sizing agent. The adhesion amount of the sizing agent is adjusted by adjusting the concentration of the sizing agent in the aqueous dispersion.

Embodiment 13

[0179] A carbon fiber bundle (trade name "TR50S 15L", manufactured by Mitsubishi Chemical Corporation) was used as a continuous fiber bundle. The carbon fiber bundle was intermittently divided so that the length of the undivided part between adjacent sub-filament bundles was 16 mm, and a carbon fiber bundle including 5 sub-bundles with a total filament number of 15,000 and a total fineness of 1,000 tex was obtained. Next, it carried out similarly to Example 2, and produced the carbon fiber bundle with a sizing agent.

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Abstract

Provided is a sizing agent containing component (A) and component (B), wherein the mass ratio A / B of component (A) relative to component (B) is 0.5-20, and the ratio of the total combined amount of component (A) and component (B) to the total amount of the sizing agent is at least 80 mass%. The component (A) is an epoxy resin having a viscosity at 30 DEG C of 1-180,000 Pa.s. The component (B) is an aliphatic ester compound having a freezing point of 50 DEG C or lower.

Description

technical field [0001] The present invention relates to a sizing agent, a reinforcing fiber bundle, a fiber-reinforced resin molding material and a fiber-reinforced composite material. [0002] This application claims priority based on Japanese Patent Application No. 2018-123885 for which it applied in Japan on June 29, 2018, and uses the content for this application. Background technique [0003] A carbon fiber-reinforced composite material formed by molding a molding material including carbon fibers as reinforcing fibers is light in weight and high in strength, and thus is widely used in various fields. As the molding material, a sheet molding compound (SMC) using short fibers, a prepreg using continuous fibers, and the like are known. SMC has excellent fluidity, so it is suitable for forming complex shapes that are difficult to mold from prepregs. [0004] When short fibers are used, it is known that the mechanical properties of the composite material are strongly influ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/55C08J5/06D06M13/224D06M101/40
CPCD06M15/55D06M13/224C08J5/06C01B32/05D06M2101/40D06M2200/50B29C70/18B29C2793/0081D01F11/14C08J5/042C09D163/00C08J5/248
Inventor 兼田显治若林巧己高田刚中尾洋之
Owner MITSUBISHI CHEM CORP
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