Polymer surface grafting method for carbon fiber

A surface grafting, carbon fiber technology, applied in the direction of carbon fiber, fiber treatment, textiles and papermaking, etc., can solve the problems of solvent unfriendly monomer selection, difficult control of conditions, and high system temperature, to improve the interface bonding quality, simple operation, The effect of mild reaction conditions

Active Publication Date: 2014-05-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for grafting polymers on the surface of carbon fibers to solve the shortcomings of the existing "grafting from" method, such as high system temperature, difficult control conditions, unfriendly solvents and limited selection of monomers.

Method used

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  • Polymer surface grafting method for carbon fiber
  • Polymer surface grafting method for carbon fiber
  • Polymer surface grafting method for carbon fiber

Examples

Experimental program
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specific Embodiment approach 1

[0035] Specific embodiment one: the method for grafting polymer on the surface of a carbon fiber in this embodiment is carried out through the following steps:

[0036] 1. Remove the epoxy coating;

[0037] 2. Oxidized carbon fiber: at room temperature, prepare 35-50ml of a mixed solution of potassium permanganate and sulfuric acid, wherein the dosage of potassium permanganate is 0.35-0.60g, the concentration of sulfuric acid is 1-2mol / L, and then the mass Put 0.35~0.70g of carbon fiber into the mixed solution of potassium permanganate and sulfuric acid, pour it into a glass test tube, put it into a supercritical device, and react in a system with a temperature of 320~340°C and a pressure of 2~5MPa 15-25min, then take out the carbon fiber, put it into a beaker filled with hydrochloric acid with a mass concentration of 37.5%, seal it well, put it in a water bath at 55-65°C, soak it for 2-4h, and put it into the Soxhlet extractor again , at 80°C, wash the carbon fibers with eth...

specific Embodiment approach 2

[0047] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the method for removing the epoxy coating described in step one is: put the carbon fiber bundle in the Soxhlet extractor, heat the acetone in the Soxhlet extractor to 75-85°C, keep it for 2-8 hours, then put it into a supercritical device, soak it in a supercritical acetone-water system with a temperature of 350-370°C and a pressure of 8-14MPa for 20-30min, and then put it into the cable again. In the extractor, clean the carbon fiber in acetone at 75-85°C for 2-4 hours, then take out the carbon fiber and dry it in an oven at 70-80°C for 2-4 hours, and the process is complete. Others are the same as the first embodiment.

specific Embodiment approach 3

[0048] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the supercritical acetone-water system is composed of 25 mL of acetone and 5 mL of water. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a polymer surface grafting method for a carbon fiber, and aims to overcome the defects of high system temperature, difficulty in control over conditions, solvent environment unfriendliness and limited monomer selection of an existing grafting from method. The method comprises the following steps: (1) removing an epoxy coating; (2) oxidizing the carbon fiber; (3) acylating and chlorinating the carbon fiber to obtain the acylated and chlorinated carbon fiber; (4) performing alcoholysis on the carbon fiber; and (5) grafting a polymer under a Ce<4+> initiating system of the carbon fiber to complete the operation. According to the method, reaction conditions of a Ce<4+> oxidation-reduction initiating system are mild, the operation is simple, monomers with different characteristics can be selected, and different performances are provided; the polymer can carry a great number of polar groups, so that the surface activity of the carbon fiber is improved, and the interfacial bonding quality of the carbon fiber and resin is further improved. The invention relates to the field of carbon fiber modification.

Description

technical field [0001] The invention relates to a method for grafting polymers on the surface of carbon fibers. Background technique [0002] Carbon fiber is a reinforcement material often used in high-performance resin-based composite materials. It has high specific strength and specific modulus, low thermal expansion rate, good dimensional stability, good thermal conductivity, good weather resistance and good thermal stability. , Widely used in aviation, aerospace, national defense, construction, machinery, electronics, medical, biological engineering and many other fields. Due to its smooth surface, low content of active functional groups, and inert surface, carbon fiber affects the interfacial bonding performance between carbon fiber and resin matrix, thus affecting the overall excellent performance of carbon fiber composite materials. [0003] Commonly used carbon fiber surface modification methods include oxidation, coating and radiation methods. Oxidation methods ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M14/36D06M11/55D06M11/50D06M11/13D06M13/148D06M15/53D06M13/325D06M13/268D06M101/40
Inventor 孟令辉戚美微马立春于佳立黄玉东
Owner HARBIN INST OF TECH
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