Surface treatment method of carbon fiber composite

A composite material and surface treatment technology, applied in the direction of coating, etc., can solve the problems of incomplete removal of mold release agent, difficulty in surface activity, etc., and achieve the effect of easy wetting and adhesion, less harm to human body, and improved surface energy

Active Publication Date: 2018-03-06
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves the problems of difficulty in improving the surface activity of existing carbon fiber composite materials and incomplete removal of release agents. The main research object is carbon fiber reinforced epoxy resin or phenolic resin composite materials containing more silicon release agents on the surface of the substrate. Three key steps of treatment to obtain a highly active substrate surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Use 500-mesh water sandpaper to evenly polish the surface of the carbon fiber reinforced epoxy resin composite material substrate in the same direction. Finally, dry at 60°C for 2 hours, then use absorbent cotton to dip in a 3% NaF and HCOOH mixture (NaF:HCOOH=0.1), wipe the surface of the substrate in the same direction for 5 minutes, and rinse the surface of the carbon fiber composite material with high-pressure tap water for 1 minute. After drying, apply a layer of high-activity epoxy resin transition layer with a thickness of about 18 μm, and spray a layer of epoxy primer with a thickness of 56 μm after it is surface-dry, and use the cross-cut method to qualitatively analyze the paint film after 48 hours of natural drying The adhesion is grade 0, and the adhesion of the paint film is quantitatively analyzed by the pull-off method to be 6.78MPa.

Embodiment 2

[0017] Use 800-mesh water sandpaper to evenly polish the surface of the carbon fiber reinforced epoxy resin composite material substrate in the same direction. Finally, dry at 60°C for 2 hours, then use absorbent cotton to dip in a 2% NaF and HCOOH mixture (NaF:HCOOH=0.05), wipe the surface of the substrate in the same direction for 3 minutes, and rinse the surface of the carbon fiber composite material with high-pressure tap water for 1 minute. After drying, apply a layer of high-activity polyurethane transition layer about 26 μm thick, spray a layer of polyurethane primer with a thickness of 59 μm after it is surface-dry, and use the cross-hatch method to qualitatively analyze the adhesion of the paint film after 48 hours of natural drying. Level 0, the adhesion of the paint film is quantitatively analyzed by the pull-off method to be 6.56MPa.

Embodiment 3

[0019] Use 700-mesh water sandpaper to evenly polish the surface of the carbon fiber reinforced phenolic resin composite substrate in the same direction. , dry at 60°C for 2 hours, then use absorbent cotton to take a mixture of 2% NaF and HCOOH (NaF:HCOOH=0.02), wipe the surface of the substrate in the same direction for 6 minutes, and rinse the surface of the carbon fiber composite material with high-pressure tap water for 1 minute. After drying, apply a layer of high-activity phenolic resin transition layer about 32 μm thick, spray a layer of 62 μm thick epoxy primer after it is surface-dry, and use the cross-hatch method to qualitatively analyze the adhesion of the paint film after 48 hours of natural drying. The force is grade 0, and the adhesion force of the paint film is quantitatively analyzed by the pull-off method to be 6.37MPa.

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Abstract

The invention relates to a surface treatment method of carbon fiber reinforced epoxy resin or phenolic resin composite being low in surface free energy and high in quantity of silicon mold release agents. The method comprises the following steps: (1) primarily grinding the surface of a base carbon fiber composite material through waterproof abrasive paper with 300-1000 meshes so as to remove mostof silicon mold release agent containing components and low-activity components on the surface as well as expose some functional groups with high hydrophilia; (2) dipping degreasing cotton into 1-5% by concentration of mixed solution prepared through NaF and HCOOH based on the ratio of 0.1-0.01; wiping the grinded surface of the base material for 5-10min to completely remove the rest silicon moldrelease agents; and slightly swelling the surface of the base carbon fiber composite material; and (3) coating the surface without the mold release agent with a high-activity and high-compatibility resin transition layer being 10-40 microns in thickness; naturally drying for 3-5h; and then correspondingly coating. The method is simple in processes, and low in cost; and the adhesion of the carbon fiber composite surface and the coating can be greatly improved.

Description

technical field [0001] The invention relates to a method for surface treatment of carbon fiber-reinforced epoxy resin or phenolic resin composite material, through three-step treatment to obtain a carbon fiber-reinforced composite material substrate surface with high surface energy, no release agent, and no carbon fiber damage. It can greatly improve the adhesion ability of the primer in subsequent painting operations. The invention belongs to the technical field of pre-painting treatment of new plastic substrates. Background technique [0002] Carbon fiber is an inorganic polymer fiber with a carbon content of more than 90% that is formed by pyrolysis and carbonization of organic matrix fibers at a high temperature of 1000°C to 3000°C in an inert gas environment. Among them, those with a carbon content of more than 99% are also called graphite. fiber. Carbon fiber has quite unique and outstanding physical and chemical properties. It has many excellent properties such as h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C08J7/12C08J7/14C08J7/00C08L63/00C08L61/06C08K7/06
CPCC08J7/00C08J7/0427C08J7/12C08J7/14C08J2361/06C08J2363/00C08K7/06
Inventor 温福山刘东夏海渤陈旭王浩丁若男李丽赵民张慧孙禹王璐赖怡姚小林刘治坤孔维洁袁昌旗李涵王志
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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