A kind of method of carbon fiber surface modification

A technology of surface modification and carbon fiber, which is applied in the fields of carbon fiber, fiber treatment, textiles and papermaking, etc. It can solve the problems of difficult preparation of boron nitride grains, improve surface roughness and surface activity, improve modification efficiency, The effect of low hydrothermal reaction temperature

Active Publication Date: 2020-06-30
HUNAN JINGE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Boron nitride has excellent properties such as high melting point, chemical stability and excellent dielectric properties. When used as a coating, it can not only improve the mechanical properties of the material, but also increase the oxidation resistance of the material. It is the first step in the surface modification of carbon fibers. However, Since the concentration of group V negative ions in water is very low, and boron nitride reacts with water under high temperature and high pressure conditions, it is generally considered difficult to prepare boron nitride grains by hydrothermal reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0031] Embodiment 1: This embodiment provides a method for modifying the surface of carbon fibers, which is specifically completed according to the following steps: 1. Glue removal

[0032] Put 5g of carbon fiber into a Soxhlet extractor filled with a mixed solution of ethanol / acetone / tetrahydrofuran at a volume ratio of 1:1:1, and use the mixed solution to extract at 60°C for 15 hours to remove the sizing agent and impurities on the surface of the carbon fiber , and then soaked in ethanol solution and distilled water solution for 10 minutes respectively, after cleaning, place the carbon fiber in a blast drying oven at 100°C for 30 minutes to obtain carbon fiber with a clean surface;

[0033] 2. Generate boron nitride grains

[0034] (1) Prepare 0.01M boric acid solution and 0.005M sodium azide solution respectively, then add the boric acid solution to the sodium azide solution, and the volume ratio of the boric acid solution to the sodium azide solution is 1:1; Stir at ℃ for...

specific Embodiment approach 2

[0042]Specific embodiment two: This embodiment provides a carbon fiber surface modification method, which is specifically completed according to the following steps:

[0043] 1. Degumming

[0044] Put 5g of carbon fiber into a Soxhlet extractor filled with a mixed solution of ethanol / acetone / tetrahydrofuran at a volume ratio of 1:2:1, and use the mixed solution to extract at 50°C for 15 hours to remove sizing agents and impurities on the surface of the carbon fiber , then immerse in ethanol solution and distilled water solution for 5 minutes each, and after cleaning, place the carbon fiber in a blast drying oven at 120°C for 50 minutes to obtain carbon fiber with a clean surface;

[0045] 2. Generate boron nitride grains

[0046] (1) Prepare 0.02M boric acid solution and 0.01M sodium azide solution respectively, then add boric acid solution to sodium azide solution, the volume ratio of boric acid solution and sodium azide solution is 1:2, at 35 Stir at ℃ for 1.5h, the rotati...

specific Embodiment approach 3

[0054] Specific Embodiment Three: This embodiment provides a method for modifying the surface of carbon fibers, which is specifically completed according to the following steps: 1. Glue removal

[0055] Put 5g of carbon fiber into a Soxhlet extractor filled with a mixed solution of ethanol / acetone / tetrahydrofuran at a volume ratio of 1:2:2, and use the mixed solution to extract at 70°C for 24 hours to remove the sizing agent and impurities on the surface of the carbon fiber , then immerse in ethanol solution and distilled water solution for 8 minutes respectively, and after cleaning, place the carbon fiber in a blast drying oven at 150°C for 60 minutes to obtain carbon fiber with a clean surface;

[0056] 2. Generate boron nitride grains

[0057] (1) Prepare 0.03M boric acid solution and 0.008M sodium azide solution respectively, then add boric acid solution to sodium azide solution, the volume ratio of boric acid solution and sodium azide solution is 1:5, at 20 Stir at ℃ for...

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Abstract

The invention discloses a method for modifying the surface of a carbon fiber, in particular relates to a preparation method of generating boron nitride crystal grains on the surface of the carbon fiber and belongs to the field of composite interface modification. The method for modifying the surface of the carbon fiber comprises the following steps: firstly, removing adhesive; secondly, generating the boron nitride crystal grains; and thirdly, carrying out low temperature ageing. The method disclosed by the invention has the advantages that reaction conditions are optimized, boron nitride generates the crystal grains in a hydrothermal environment, and coating the boron nitride crystal grains on the surface of the carbon fiber, so as to achieve the aim of modifying the carbon fiber; not only are surface roughness and surface activity of the carbon fiber improved, but also mechanical meshing effect is realized in resin matrix, so that mechanical properties of a composite are improved.

Description

technical field [0001] The invention belongs to the field of interface modification of composite materials, and relates to a method for modifying the surface of carbon fibers, in particular to a method for preparing boron nitride grains on the surface of carbon fibers. Background technique [0002] Due to its advantages of high specific strength, low density and high specific modulus, carbon fiber composites are widely used in the fields of aerospace, automobiles, weaponry and sporting goods. Among them, the commonly used carbon fiber composite materials are resin-based, metal-based and carbon-based, among which carbon fiber resin-based composite materials are the most widely used in various composite materials, and epoxy resin matrix is ​​the most representative of resin matrix composite materials. . [0003] Carbon fiber resin matrix composites have good mechanical properties. However, as modern society requires higher and higher mechanical properties of structural mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/80D06M101/40
CPCD06M11/80D06M2101/40
Inventor 邹利民邹若之邹胜民李卓
Owner HUNAN JINGE NEW MATERIAL
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