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A kind of carbon fiber surface modification method

A surface modification, carbon fiber technology, applied in the direction of carbon fiber, fiber treatment, textile and papermaking, etc., can solve the problems of carbon fiber performance degradation, carbon fiber erosion and other problems, to achieve the effect of improving the interface performance and improving the resistance to atomic oxygen

Active Publication Date: 2016-04-27
HARBIN INST OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the existing carbon fibers in the near-Earth space orbit are seriously eroded by atomic oxygen, resulting in the degradation of carbon fiber performance, the present invention provides a carbon fiber surface graft modification method, which can lay a solid foundation for the use of composite materials under space environmental conditions. certain theoretical basis

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  • A kind of carbon fiber surface modification method
  • A kind of carbon fiber surface modification method

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specific Embodiment approach 1

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

[0032] 1. Cleaning

[0033] Put 6g of carbon fibers into a Soxhlet extractor filled with acetone, extract with acetone at a temperature of 60°C, and remove the sizing agent and impurities on the surface of the carbon fibers. The cleaning time is 12 hours. Dry in a blast drying oven to obtain cleaned carbon fibers.

[0034] 2. Oxidation

[0035] (1) Put 2 g of dry and cleaned carbon fibers obtained in step 1 into a 250 ml round bottom flask, add 100 ml of concentrated nitric acid, and oxidize at 60 ° C for 2 h. The concentrated nitric acid concentration is 68%.

[0036] (2) Soak 2g of oxidized carbon fibers obtained in step 2 (1) in 100ml of distilled water for 5 minutes, take out the carbon fibers soaked in distilled water, and discard the distilled water.

[0037] (3) Repeat step 2 (2) 5 times to ob...

specific Embodiment approach 2

[0043] Specific embodiment two: This embodiment provides a carbon fiber surface modification method, which is specifically completed according to the following steps:

[0044] 1. Cleaning

[0045] Put 6g of carbon fiber into a Soxhlet extractor filled with acetone, extract with acetone at a temperature of 70°C, and remove the sizing agent and impurities on the surface of the carbon fiber. The cleaning time is 32 hours. Dry in a blast drying oven to obtain cleaned carbon fibers.

[0046] 2. Oxidation

[0047] (1) Put 2g of dry and cleaned carbon fibers obtained in step 1 into a 250ml round bottom flask, add 100ml of concentrated nitric acid, and oxidize at 80°C for 3h. The concentrated nitric acid concentration is 68%.

[0048] (2) Soak 2g of the oxidized carbon fiber obtained in step 2 (1) in 100ml of distilled water for 10 minutes, take out the carbon fiber soaked in distilled water, and discard the distilled water.

[0049](3) Repeat step 2 (2) 5 times to obtain the clea...

specific Embodiment approach 3

[0055] Specific embodiment three: This embodiment provides a method for modifying the surface of carbon fibers, which is specifically completed according to the following steps:

[0056] 1. Cleaning

[0057] Put 6g of carbon fiber into a Soxhlet extractor filled with acetone, and use acetone to extract at a temperature of 80°C to remove the sizing agent and impurities on the surface of the carbon fiber. The cleaning time is 48 hours. Dry in a blast drying oven to obtain cleaned carbon fibers.

[0058] 2. Oxidation

[0059] (1) Put 2g of dry and cleaned carbon fibers obtained in step 1 into a 250ml round bottom flask, add 30ml of concentrated nitric acid and 90ml of concentrated sulfuric acid, and oxidize at 80°C for 3h. The described concentrated nitric acid concentration is 68%, and the concentrated sulfuric acid concentration is 68%.

[0060] (2) Soak 2g of the oxidized carbon fiber obtained in step 2 (1) in 100ml of distilled water for 10 minutes, take out the carbon fib...

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Abstract

The invention relates to a carbon fiber surface modification method and belongs to the field of modification of composite interfaces. In order to solve the problems of performance reduction of a carbon fiber, caused by the fact that the existing carbon fiber is seriously abraded by elemental oxygen on a near-ground space track, the method comprises the steps as follows: 1 cleaning; 2 oxidizing; 3 acylating chlorination; 4 stem grafting of bi (3-aminophenyl) phenylphosphine oxide (BAPPO). The carbon fiber surface modification method utilizes the excellent elemental oxygen resistant performance of the BAPPO, the BAPPO is grafted to the surface of the carbon fiber, the elemental oxygen resistant performance is improved, and an amino group of the BAPPO reacts with a resin matrix, so that the interface performance is improved. The method lays a certain theoretical foundation for the use of composites under the condition of the space environment.

Description

technical field [0001] The invention belongs to the field of interface modification of composite materials, and relates to a preparation method of carbon fiber interface grafting. Background technique [0002] Carbon fiber has high strength, rigidity and low coefficient of thermal expansion. In addition, the thermal expansion coefficient of carbon fiber is negative in the axial direction and positive in the transverse direction. It can be made into a composite material component with a coefficient of thermal expansion close to zero through suitable layup. It is especially suitable for Used as aerospace structural material where size is critical. Therefore, it has been widely used in satellite structural materials (including solar cell substrates, antenna materials, wire brackets, casings, support frames, etc.) and aircraft (wings, skins, vertical tails and blades, etc.). Among them, carbon fiber / epoxy resin composite materials have been successfully used in meteorological s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M13/44D06M101/40
Inventor 贺金梅王梓桥刘长瑜李纪伟尉枫
Owner HARBIN INST OF TECH
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