Surface modification method for carbon fibers by nano silicon dioxide

A nano-silica, surface modification technology, applied in the direction of carbon fiber, fiber processing, textiles and papermaking, etc., can solve the problems of poor mechanical and thermal properties of carbon fiber, improve mechanical properties, improve wettability, and enhance transfer effect. Effect

Active Publication Date: 2015-04-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem of poor mechanical and thermal properties of carbon fibers at present, and provides a method for surface modification of carbon fibers by nano-silica

Method used

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  • Surface modification method for carbon fibers by nano silicon dioxide
  • Surface modification method for carbon fibers by nano silicon dioxide
  • Surface modification method for carbon fibers by nano silicon dioxide

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specific Embodiment approach 1

[0018] Specific embodiment one: the method for surface modification of carbon fiber by nano-silica in this embodiment is carried out according to the following steps:

[0019] 1. Surface halogenation of nano silicon dioxide to obtain the product;

[0020] 2. Nano silicon dioxide surface azidation treatment:

[0021] A. Add the product obtained in step 1, sodium azide and N,N-dimethylformamide into the reaction flask, heat up to 50°C, react for 24-48 hours, and centrifuge to remove the supernatant;

[0022] B. Add water and N,N-dimethylformamide, sonicate for 0.5-2 hours and then centrifuge. Repeat this step 3 times. The obtained product is vacuum-dried and weighed for later use.

[0023] 3. Oxidation treatment of carbon fiber:

[0024] Use acetone as a solvent in the Soxhlet extractor, condense and reflux at 70°C for 48 hours, and dry for later use. Add the dried carbon fibers to concentrated nitric acid with a mass fraction of 69%, and heat up to 80-100°C in an oil bath. °...

specific Embodiment approach 2

[0030] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the concrete method that carries out surface halogenation to nano silicon dioxide in step one is:

[0031] a. Add nano-silica, triethylamine and toluene A into a dry three-necked flask, dissolve bromoisobutyryl bromide in toluene B and add dropwise to the three-necked flask, and react in an ice-water bath for 3 hours , after the temperature of the reaction system returns to room temperature, continue the reaction for 12 to 24 hours;

[0032] b. Centrifuge to remove the supernatant, then add toluene C, and sonicate for 0.5h to 2 hours, repeat this step 3 times, vacuum-dry the obtained product, and weigh it for later use;

[0033] The mass ratio of nano-silica to bromoisobutyryl bromide is 1:1-3, the mass ratio of nano-silica to toluene A is 1:15-20, and the mass ratio of bromoisobutyryl bromide to triethylamine The mass ratio of bromoisobutyryl bromide to toluene B is 1:5 to ...

specific Embodiment approach 3

[0034] Specific embodiment three: the difference between this embodiment and specific embodiment one is: in step one, the specific method for carrying out surface halogenation to nano silicon dioxide is:

[0035] a. Add nano-silica and toluene X to a dry three-necked flask, dissolve thionyl chloride in toluene Y and add dropwise to the three-necked flask. The reaction is carried out in an ice-water bath for 3 hours, and the temperature of the reaction system returns. After reaching room temperature, continue to react for 12 to 24 hours;

[0036] b. Centrifuge to remove the supernatant, then add toluene Z, and sonicate for 0.5-2 hours, repeat this step 3 times, vacuum-dry the obtained product, and weigh it for later use;

[0037] Wherein the mass ratio of nano silicon dioxide and toluene X is 1:15~20, the mass ratio of nano silicon dioxide and thionyl chloride is 1:1~3, the mass ratio of thionyl chloride and toluene Y is 1:5 ~10, the mass ratio of nano-silica and toluene Z is ...

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Abstract

The invention provides a surface modification method for carbon fibers by nano silicon dioxide and relates to a method for carrying out surface modification on the carbon fibers, aiming at solving the problems that the mechanical property and the thermal property of current carbon fibers are worse. The method comprises the following steps: 1. carrying out surface halogenation on the nano silicon dioxide to obtain a product; 2. carrying out nano silicon dioxide surface azidation treatment; 3. carrying out oxidization treatment on the carbon fibers; 4. carrying out carbon fiber surface modification alkynylation treatment; and 5. grafting the nano silicon dioxide on the surfaces of the carbon fibers. After the nano silicon dioxide is modified, the surface wettability of the carbon fibers is remarkably improved, and the roughness is obviously increased; and a transferring effect between a base body and an interface in a composite material can be easily enhanced, the stress concentration can be effectively alleviated, and the damages to the material are prevented, so that the mechanical property of the composite material is improved. The thermal stability of the carbon fibers is remarkably improved through the surface modification of the nano silicon dioxide. The surface modification method is used for modifying the carbon fibers.

Description

technical field [0001] The invention relates to a method for surface modification of carbon fibers. Background technique [0002] Carbon fiber (CF) is a continuous filament carbon material with a diameter ranging from 6 to 8 μm, which is only about 1 / 3 of a hair. It is a new type of material developed to meet the demand for materials for high-performance aircraft in recent decades. Carbon fiber is a low-density, high-strength, high-specific modulus fibrous carbon material with a carbon content of more than 90%. It has outstanding advantages such as good wear resistance, heat resistance, electrical conductivity, lubricity, and These properties make carbon fiber an ideal functional structural material. The carbon fiber reinforced composite materials also have corresponding properties such as high specific modulus, high strength, high temperature resistance, and corrosion resistance. When preparing composite materials, the bonding strength between carbon fiber and matrix mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/79D06M11/64D06M13/144D06M101/40
Inventor 韩文波张幸红赵广东薛忠刚王鹏程业红
Owner HARBIN INST OF TECH
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