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Method for preparing graphene oxide grafting surface modification carbon fiber

A technology of surface modification and carbon fiber, which is applied in the direction of carbon fiber, chemical instruments and methods, fiber treatment, etc., can solve the problems of reduced interlayer shear strength of composite materials, poor wettability of resin matrix, and reduced surface tension, etc., reaching the price Low cost, improved roughness, and improved interface properties

Active Publication Date: 2012-11-21
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a graphene oxide grafted surface-modified carbon fiber in order to solve the technical problems of low surface activity of the existing carbon fiber, decreased surface tension, poor wettability with the resin matrix, and reduced interlayer shear strength of the composite material. Methods

Method used

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  • Method for preparing graphene oxide grafting surface modification carbon fiber
  • Method for preparing graphene oxide grafting surface modification carbon fiber
  • Method for preparing graphene oxide grafting surface modification carbon fiber

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specific Embodiment approach 1

[0025] Specific embodiment one: the method for grafting surface modified carbon fiber of graphene oxide in this embodiment is carried out according to the following steps:

[0026] 1. Graphite oxidation:

[0027] Add graphite into the mixture of strong oxidizing acid and nitrate, cool to -5°C~0°C, stir and add potassium-containing strong oxidant at a speed of 50rpm~200rpm, and continue stirring for 4h~12h to obtain a mixed solution. Pour the solution into a water bath at 10°C to 50°C, continue to react for 40min to 60min, then add hot water at 90°C to 100°C, make the system boil and keep it for 20min to 40min, then add hydrogen peroxide solution with a volume concentration of 40% to 60%. , stirred at a speed of 100rpm to 500rpm until completely dissolved, then washed with ultrapure water for 3 to 6 times, and filtered until there was no SO in the filter cake 4 2- , and then freeze-dried at -35°C to obtain graphite oxide;

[0028] Wherein the mass ratio of graphite and stron...

specific Embodiment approach 2

[0038] Embodiment 2: This embodiment differs from Embodiment 1 in that the strong oxidizing acid described in step 1 is concentrated sulfuric acid or perchloric acid. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0039] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the potassium-containing strong oxidizing agent described in step one is potassium permanganate or potassium perchlorate. Others are the same as in the first or second embodiment.

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Abstract

A method for preparing a graphene oxide grafting surface modification carbon fiber relates to a carbon fiber modification method, and is used for solving the technical problems that the existing carbon fiber has low surface activity, reduced surface tension and poor wettability with a resin matrix, and the interlaminar shear strength of a composite material is caused to reduce. The method comprises the steps as follows: 1, graphite oxidization; 2, separation of graphite oxide mother liquor; 3, functionalization of graphite oxide; 4, carbon fiber surface functionalization; and 5, carbon fiber surface graphite oxide treatment. The graphite oxide uniformly covers the carbon fiber surface, the roughness of the carbon fiber surface can be greatly improved, and accordingly, the interfacial properties of a carbon fiber reinforced composite material can be improved by an anchoring action. The interfacial shear strength of the surface grafting graphene oxide carbon fiber / carbon composite material which is prepared through graphene oxide grafting modification can be improved by 25% in comparison with that of the untreated surface grafting graphene oxide carbon fiber / carbon composite material.

Description

technical field [0001] The invention relates to a modification method of carbon fiber. Background technique [0002] Carbon fiber, as the name suggests, not only has the inherent characteristics of carbon materials, but also has the softness and processability of textile fibers. It is a new generation of reinforcing fibers. Carbon fiber is a microcrystalline graphite material obtained by carbonizing and graphitizing organic fibers. The microstructure of carbon fiber is similar to artificial graphite, which is a turbostratic graphite structure. Carbon fiber is a new material with excellent mechanical properties. Its specific gravity is less than 1 / 4 of that of steel. The tensile strength of carbon fiber resin composite materials is generally above 3500Mpa, which is 7-9 times that of steel. The tensile modulus of elasticity is 230 ~430Gpa is also higher than steel. Therefore, the specific strength of CFRP, that is, the ratio of the strength of the material to its density, c...

Claims

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Application Information

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IPC IPC(8): D06M11/64D06M11/55D06M13/268D06M11/74C01B31/04C08K9/04C08K9/02C08K7/06C08J5/06D06M101/40C01B32/198
Inventor 姜再兴张晨阳刘长瑜郑晓强牟辰中李悦黄玉东刘丽
Owner HARBIN INST OF TECH
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