In-situ growth method for carbon nano tubes (CNTs) on carbon fiber surface

An in-situ growth, carbon fiber technology, used in carbon fiber, fiber processing, textiles and papermaking, etc., can solve the problems of uneven distribution of carbon nanotubes, reduced carbon fiber body strength, etc., to achieve controllable loading and distribution density, and fiber strength. The effect of low loss and low tensile strength loss rate

Inactive Publication Date: 2015-04-22
NO 53 RES INST OF CHINA NORTH IND GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention aims to provide a chemical deposition method for in-situ growth of carbon nanotubes on the surface of carbon fibers to...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Toray T700 carbon fiber was treated under nitrogen atmosphere at 400°C for 2 hours to remove the sizing agent on the surface of the fiber.

[0026] The carbon fiber was placed in 2wt% ammonium bicarbonate electrolyte, and electrolytically treated at a current intensity of 1.0A for 1 min, and the carbon fiber was subjected to electrochemical surface modification treatment, washed with water, and dried.

[0027] The surface-treated carbon fibers were immersed in a 0.05mol / L cobalt nitrate solution for 10 minutes, and dried at room temperature.

[0028] Put the catalyst-loaded carbon fiber in a CVD furnace, pass high-purity nitrogen gas, exhaust the air, raise the temperature to 500°C, turn off the nitrogen gas, replace it with high-purity hydrogen gas, and keep the temperature constant for 30 minutes.

[0029] Turn off the hydrogen, switch to nitrogen, raise the temperature to 600°C, and then inject hydrogen and ethylene. Carbon source gas: hydrogen = 1:2 (flow ratio), c...

Embodiment 2

[0035] Soak Yangzhou T300 carbon fiber fabric in acetone for 5 hours to remove the sizing agent on the fiber surface.

[0036] The carbon fiber was placed in a 7wt% sulfuric acid electrolyte, and electrolytically treated at a current intensity of 0.5A for 12 minutes, and the carbon fiber was subjected to electrochemical surface modification treatment, washed with water, and dried.

[0037] The surface-treated carbon fibers were immersed in 0.3mol / L ferric nitrate solution for 50min and dried at room temperature.

[0038] Put the catalyst-loaded carbon fiber in a CVD furnace, feed high-purity nitrogen, exhaust the air, raise the temperature to 450°C, and directly feed hydrogen and acetylene. Carbon source gas: hydrogen = 1:6 (flow ratio), constant temperature for 60 minutes. Stop heating, turn off the acetylene and hydrogen, and after the furnace temperature drops to room temperature, turn off the nitrogen, take out the sample, and obtain the CNTs-CF complex.

[0039]The CNTs...

Embodiment 3

[0041] Place the T700 grade carbon fiber without sizing agent on the surface in 3wt% ammonium sulfate electrolyte, electrolytically treat it at a current intensity of 0.3A for 6 minutes, carry out electrochemical surface modification treatment on the carbon fiber, wash with water, and dry.

[0042] The carbon fibers after surface treatment were immersed in 0.1mol / L nickel nitrate solution for 15min, and dried at room temperature.

[0043] Put the carbon fiber loaded with the catalyst in a CVD furnace, pass high-purity nitrogen gas, exhaust the air, raise the temperature to 400°C, turn off the nitrogen gas, replace it with high-purity hydrogen gas, and keep the temperature constant for 20 minutes.

[0044] Turn off the hydrogen, switch to nitrogen, raise the temperature to 500°C, and then inject hydrogen and methane. Carbon source gas: hydrogen = 1:3 (flow ratio), constant temperature for 45 minutes. Stop heating, turn off methane and hydrogen, and after the furnace temperatur...

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Abstract

The invention belongs to the technical field of composite materials. An in-situ growth method for carbon nano tubes (CNTs) on a carbon fiber surface is that the controlled surface treatment is carried out on carbon fibers by adopting an electrochemical process, so as to control the quantity and the distribution of active points on the carbon fiber surface; a catalyst is loaded by adopting a solution infiltration method, so that the catalyst can be uniformly distribute on the carbon fiber surface. The in-situ growth method for the (CNTs) on the carbon fiber surface comprises the steps of treating the surfaces of the carbon fibers; loading the catalyst; reducing the catalyst; promoting the growing of the CNTs; the surfaces treatment of the carbon fibers is carried out by adopting the electrochemical process; the electrolyte concentration is 1 to 10wt.%, the electrolyzing current is 0.1 to 1.5A, and the electrolyzing is carried out for 1 to 15min. The method is mild in processing condition, simple to operate and easy to control; the fiber intensity is lost little; the damage ratio of multifilament tensile strength is less than 10%; the CNTs are uniformly and densely distributed on the carbon fiber surface, and the loading quantity and the distribution density are controllable; the interlayer scission strength of a composite material can be improved by more than 13%; the method is applicable to the field of processing of carbon fiber reinforced resin based composite materials, and particularly applied to the field of processing of the carbon fiber reinforced resin based composite materials with high requirements on interlayer adhering performances.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a carbon fiber surface treatment technology, especially a technology for in-situ growth of carbon nanotubes. Background technique [0002] Because the carbon atoms in the carbon fiber exist in graphite layered structure, its surface is chemically inert, so the bonding performance between the carbon fiber and the resin matrix is ​​poor, resulting in low interfacial strength and poor interlayer performance of the carbon fiber composite material, which affects its performance in some special structures. under the application. [0003] In order to improve the interfacial bonding between carbon fiber and matrix, the modification method of adding carbon nanotubes is adopted. Due to the large specific surface area of ​​carbon nanotubes, they are easy to agglomerate. In order to solve the problem of dispersion and orientation of carbon nanotubes in composite materials, resear...

Claims

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Application Information

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IPC IPC(8): D06M11/74C08K9/02C08K7/06C08J5/06D06M101/40
Inventor 王启芬陈刚于倩倩王延相魏化震崇琳吴忠泉王志远王忠王成国
Owner NO 53 RES INST OF CHINA NORTH IND GRP
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