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Sizing agent for carbon fiber

A technology of sizing agent and curing agent, which is applied in the directions of carbon fiber, fiber processing, textile and paper making, etc., can solve the problems such as the decline of carbon fiber tow bundle and the negative impact on the interface of composite materials.

Inactive Publication Date: 2011-03-02
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the matrix resin of carbon fiber reinforced composite materials is mostly epoxy resin, epoxy resin emulsion is the main sizing agent for carbon fiber. Although this water emulsion sizing agent overcomes the safety of early solvent sizing agents , sanitation and other issues, but due to the addition of emulsifiers during the preparation of the emulsion, the aggregation of the carbon fiber bundles is reduced, and it also has a negative impact on the interface of the composite material

Method used

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  • Sizing agent for carbon fiber
  • Sizing agent for carbon fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Stir 80 grams of bisphenol A type epoxy resin E-31, 10 grams of fatty alcohol polyoxyethylene ether AE07 and 10 grams of polyethylene glycol with a molecular weight of 400 at 55°C with a high-speed mixer, slowly add water during the stirring process, and pass After emulsification by phase inversion method, an emulsion with a solid content of about 40% by mass is finally obtained, and this emulsion is denoted as A.

[0026] Dilute A to 5% by mass, add 20% of the theoretical dosage of 7k type water-based curing agent (adduct of epoxy resin amine curing agent and epoxy resin, produced by Beijing Terigu Co., Ltd.), to obtain sizing agent B, carry out the emulsion stability test, the results are shown in Table 1. Then carry out gluing and testing, the method is as follows.

[0027] The 3K, PAN-based carbon fibers obtained by heat treatment at 2500°C were washed with acetone to remove the original sizing agent, and then glued with sizing agent B, and then tested for clusteri...

Embodiment 2

[0029] Dilute the epoxy resin emulsion A to 5% by mass, add 30% of the theoretical amount of 7K water-based curing agent to obtain sizing agent C, and the others are the same as in Example 1. The test results are shown in Table 1 and figure 1 Example 2 in.

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Abstract

The invention discloses a sizing agent for a carbon fiber, belonging to the fields of organic chemistry and fiber materials. The sizing agent is an epoxy water emulsion added with an aqueous curing agent, wherein the aqueous curing agent is modified epoxy amine curing agent, namely an amidated amine curing agent obtained by a reaction between a mono-fatty acid and an epoxy amine curing agent, a polyamide curing agent obtained by a reaction between a dimer acid and an epoxy amine curing agent and a curing agent obtained by a reaction between an epoxy amine curing agent and epoxy resin; the epoxy emulsion uses bisphenol A epoxy resin as the main body, and the epoxy equivalent is 200-500; the amount of the aqueous curing agent is 10% to 40% of theoretical one, and the theoretical amount should be calculated as follows: W=(Namine / NEP)*100, wherein Namine is the amine hydrogen equivalent of the curing agent, NEP is the epoxy equivalent of the epoxy resin, and W is the theoretical amount of the curing agent required by 100 grams of epoxy resin. The sizing agent is safe and healthy, the stability and the bundling performance are further improved, and the interface bonding strength of the composite material is enhanced.

Description

technical field [0001] The invention relates to a sizing agent, in particular to a sizing agent for carbon fibers obtained by heat treatment at 1000-3000°C, and belongs to the field of organic chemistry and fiber materials. technical background [0002] Carbon fiber is a reinforced material developed after the 1950s. It has a series of excellent properties such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, electrical conductivity and small thermal expansion coefficient, so it is widely used in aerospace. , sports equipment and other fields. Due to the low elongation rate of carbon fiber, it is a brittle material. In the process of production and post-processing, the monofilament is easy to break after mechanical friction, resulting in wool, which reduces the performance of the fiber and its composite material. Therefore, usually, the surface of carbon fiber should be coated with a layer of protective glue, that is, sizi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/55D06M13/402D06M15/59D06M15/53D06M13/17D06M101/40
Inventor 田艳红张西萍张学军胡琪
Owner BEIJING UNIV OF CHEM TECH
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