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Method of recovering carbon fibers by low-temperature microwave efficient treatment of carbon fiber composite material

A technology for recycling carbon fiber and composite materials, applied in the field of fiber composite materials, can solve the problems of pyrolysis gasification, easy carbonization of carbon fibers, and low oxygen content, etc., and achieve the effects of fast heating, energy saving, and high recovery efficiency

Inactive Publication Date: 2017-09-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] The above invention patent uses a mixed gas of inert gas and oxygen as the protective atmosphere, but the oxygen content is very small, the degradation reaction is still a cracking reaction, and there are common shortcomings of the cracking reaction, that is, the carbon fiber surface is easy to form carbon and the cracked gasification may contaminate environmental issues

Method used

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  • Method of recovering carbon fibers by low-temperature microwave efficient treatment of carbon fiber composite material
  • Method of recovering carbon fibers by low-temperature microwave efficient treatment of carbon fiber composite material
  • Method of recovering carbon fibers by low-temperature microwave efficient treatment of carbon fiber composite material

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Effect test

Embodiment 1

[0039] Such as figure 1 As shown, the method of low-temperature microwave efficient treatment of carbon fiber composite materials to recover carbon fibers, the specific steps are as follows: first put waste carbon fiber composite materials (carbon fiber form is short fiber, matrix resin is epoxy resin, size is 1.9×1.7×3cm) Enter the microwave heating device, feed oxygen (the amount of oxygen feed is 4LPM), and feed microwaves with a frequency of 2450±50MHz until the temperature rises to 450°C, and treat at low temperature for 0.1h to make the resin organic matter oxidize and decompose, and then naturally The temperature is lowered to below 200°C, and the solid product is taken out to be carbon fiber.

[0040] After the degradation is completed, the solid carbon fiber epoxy resin-based composite material is degraded into filamentous short carbon fibers with a smooth and complete surface and basically no resin residue.

Embodiment 2

[0042] Such as figure 1 As shown, the method of low-temperature microwave efficient treatment of carbon fiber composite materials to recover carbon fibers, the specific steps are as follows: first, the waste carbon fiber composite materials (the carbon fiber form is medium-long fiber, the matrix resin is epoxy resin, and the size is 5×5×2cm) Put it into the microwave heating device, feed oxygen (the amount of oxygen feed is 0.5LPM), and feed microwaves with a frequency of 2450±50MHz until the temperature rises to 450°C, and treat at low temperature for 1 / 6h to make the resin organic matter oxidize and decompose. , and then naturally lower the temperature to a temperature below 200°C, and the solid product is taken out to be carbon fiber.

[0043] After the degradation is completed, the solid carbon fiber epoxy resin-based composite material is degraded into filamentous filamentary medium-length carbon fibers with a smooth and complete surface, basically no resin residue, and u...

Embodiment 3

[0045] Such as figure 1 As shown, the method of low-temperature microwave efficient treatment of carbon fiber composite materials to recover carbon fibers, the specific steps are as follows: first, the waste carbon fiber composite materials (carbon fiber form is medium-long fiber, matrix resin is epoxy resin, the size is 15×10×2cm, Photos like figure 2 As shown) put into the microwave heating device, feed oxygen (the amount of oxygen feed is 1.5LPM), feed microwave with a frequency of 915±50MHz, until the temperature rises to 450°C, and treat at low temperature for 1 / 3h, so that the organic matter of the resin is generated Oxidative decomposition reaction, then naturally cool down to a temperature below 200°C, and the solid product is taken out as carbon fiber.

[0046] After the degradation is completed, the solid carbon fiber epoxy resin-based composite material is degraded into carbon fibers with filamentous lengths, as shown in the photo image 3 shown, from image 3 I...

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Abstract

The invention relates to a method of recovering carbon fibers by low-temperature microwave efficient treatment of a carbon fiber composite material and belongs to the technical field of fiber composite materials. The method comprises the following steps: firstly, putting a waste carbon fiber composite material in a microwave heating device; introducing oxygen or oxygen-containing mixed gas; feeding microwaves, the frequencies of which are 2450+ / -50MHz or 915+ / -50MHz till the temperature is raised to 350-500 DEG C; performing low-temperature treatment for 0.1-1.0h; then naturally reducing the temperature to below 200 DEG C; and taking out the solid product to obtain the carbon fibers. The method is a method of uniformly and efficiently recovering high value carbon fibers from the waste carbon fiber composite material at a low temperature at a normal pressure. According to the method, organic matters of resin are oxidized to combust at the low temperature, and the integrity of the carbon fibers is ensured. The carbon fibers are regenerated and recycled while the mechanical property and recovery rate of the carbon fibers are increased, the reaction time is shortened, the reaction flow is simplified, the energy source is saved and the environment is protected.

Description

technical field [0001] The invention relates to a method for efficiently treating carbon fiber composite materials with low-temperature microwaves to recover carbon fibers, and belongs to the technical field of fiber composite materials. Background technique [0002] Carbon fiber composite materials are widely used in many fields such as national defense, aerospace, construction, transportation and energy due to their high strength, ultra-light, high temperature and high pressure resistance. Carbon fiber is an important component of carbon fiber composite materials, which is in great demand and expensive. It is estimated that the global demand for carbon fiber will reach 25,000 tons in 2020. Calculated at an average price of 200 yuan / kg, the value will be more than 5 billion yuan. The greater the demand for carbon fiber composite materials, the more waste will be. In addition, carbon fiber composite materials in the production process The leftovers, defective products, and ...

Claims

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Application Information

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IPC IPC(8): C08J11/00C08K7/06
CPCC08J11/00C08J2381/02C08J2363/00C08J2363/10C08J2367/00C08K7/06
Inventor 许磊邓建英郭胜惠彭金辉张利波刘秉国吴庆田韩朝辉李世伟刘建华
Owner KUNMING UNIV OF SCI & TECH
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