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Carbon fiber sizing agent and preparation method as well as reinforced carbon fibers and carbon fiber composite material

A technology of carbon fiber and sizing agent, which is applied in the field of carbon fiber sizing agent, reinforced carbon fiber and carbon fiber composite materials, which can solve the problems of low shear strength, poor cohesion, and inability to exert light weight and high strength of carbon fiber, so as to increase compatibility and combination The effect of increasing force and binding force

Active Publication Date: 2019-07-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As an important matrix material for resin-based composites, unsaturated resin has the advantages of high strength, good adhesion, heat resistance, chemical corrosion resistance, and easy processing, but the cured product of unsaturated resin has poor adhesion to carbon fiber. , easy to crack, it is difficult to meet the growing engineering technical requirements
On the other hand, the surface of carbon fiber is completely composed of graphitized carbon layers, so the activity of carbon fiber surface is very low. When it is mixed with general resin to prepare composite materials, the infiltration and bonding with resin is very poor, resulting in the composite of carbon fiber resin. The shear strength between material layers is very low, and the characteristics of light weight and high strength of carbon fiber itself cannot be exerted

Method used

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preparation example Construction

[0022] The invention provides a kind of preparation method of carbon fiber sizing agent, comprising:

[0023] S1: Add the epoxy resin, isocyanate, hydroxyl polymer, acrylic monomer and solvent in the above-mentioned carbon fiber sizing agent into the stirring tank, mix and stir evenly to prepare the prefabricated body;

[0024] S2: Add surfactant and water to the preform prepared in step S1, and stir evenly to prepare a sizing agent.

[0025] In the present invention, the step S1 is preferably to add epoxy resin, isocyanate, hydroxyl polymer, acrylic acid monomer, catalyst and solvent into the stirring tank, mix and stir evenly to prepare the preform.

[0026] In the present invention, by weight, in step S1, 10-30 parts of epoxy resin, 2-5 parts of isocyanate, 2-5 parts of hydroxyl polymer, 5-10 parts of acrylic acid monomer, 1-3 parts of catalyst, 10 parts of - 30 parts of solvent, 3-10 parts of surfactant and 30-50 parts of water are added to the stirring tank, mixed and st...

Embodiment 1

[0033] By weight, add 10 parts of bisphenol A epoxy resin, 5 parts of methacrylic acid, 2.5 parts of toluene diisocyanate, 2.5 parts of polypropylene oxide, 2 parts of dibutyltin dilaurate and 20 parts of xylene into the stirring tank , the temperature was controlled at 60°C, and the temperature was stirred for 5 hours to obtain a preform; 3 parts of Tween 60 and 30 parts of distilled water were added to the above-prepared preform, and stirred for 2 hours at room temperature to obtain a sizing agent (with a solid content of 33%);

[0034] Use a sizing agent to sizing the carbon fibers at a sizing speed of 1 m / min, a drying temperature of 120°C, and a drying time of 1 min to obtain reinforced carbon fibers;

[0035] The carbon fiber composite material S1 was obtained by winding the reinforced carbon fiber and the resin matrix.

Embodiment 2

[0037]By weight, 20 parts of bisphenol A epoxy resin, 8 parts of methacrylic acid, 3.5 parts of diphenylmethane diisocyanate, 3.5 parts of polycarbonate, 3 parts of dibutyltin dilaurate and 20 parts of ethyl acetate were added to In a stirred tank, the temperature is controlled at 60°C, and the temperature is stirred for 5 hours to prepare a preform; add 5 parts of Tween 60 and 40 parts of distilled water to the preform prepared above, and stir for 2 hours at room temperature to obtain a sizing agent (solid content is 41%);

[0038] Use a sizing agent to sizing the carbon fibers at a sizing speed of 1 m / min, a drying temperature of 120°C, and a drying time of 1 min to obtain reinforced carbon fibers;

[0039] The carbon fiber composite material S2 was obtained by winding the reinforced carbon fiber and the resin matrix.

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Abstract

The invention discloses a carbon fiber sizing agent and a preparation method as well as reinforced carbon fibers and a carbon fiber composite material. The carbon fiber sizing agent is prepared from modified epoxide resin, an organic solvent, a surfactant and water; the modified epoxide resin is obtained by modifying the epoxy resin by using polyurethane and acrylic monomers; the polyurethane is obtained by enabling isocyanate to react with a hydroxyl polymer. The carbon fiber sizing agent prepared by the method is used for sizing the carbon fibers so as to obtain the reinforced carbon fibers,and the reinforced carbon fibers are then compounded with resin matrix, so that the carbon fiber composite material is obtained; a sizing agent transition layer between the carbon fibers and the resin matrix of the carbon fiber composite material can withstand higher impact force and the destructive force, so that the bonding force between the carbon fibers and the resin matrix in the carbon fiber composite material can be increased.

Description

technical field [0001] The invention belongs to the technical field of carbon fibers, and in particular relates to a carbon fiber sizing agent, a preparation method thereof, reinforced carbon fibers and carbon fiber composite materials. Background technique [0002] As an important matrix material for resin-based composites, unsaturated resin has the advantages of high strength, good adhesion, heat resistance, chemical corrosion resistance, and easy processing, but the cured product of unsaturated resin has poor adhesion to carbon fiber. , easy to crack, it is difficult to meet the growing engineering technical requirements. On the other hand, the surface of carbon fiber is completely composed of graphitized carbon layers, so the activity of carbon fiber surface is very low. When it is mixed with general resin to prepare composite materials, the infiltration and bonding with resin is very poor, resulting in the composite of carbon fiber resin. The shear strength between mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/55C08G59/16C08G59/14C08L101/02C08K9/08C08K7/06C08J5/06D06M101/40
CPCD06M15/55C08G59/14C08G59/1466C08J5/06D06M2101/40D06M2200/40C08J2300/10C08K9/08C08K7/06
Inventor 高鹏朱自清
Owner BYD CO LTD
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