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Method for recovering carbon fibers from carbon fiber composite material

A technology for recycling carbon fiber and composite materials, which is applied in the field of carbon fiber recycling from carbon fiber composite materials, can solve the problems of easy carbon formation on the surface of carbon fiber, uneven performance of carbon fiber, and reduced performance of carbon fiber, so as to achieve uniform performance, shorten the time of degradation reaction, The effect of reducing energy consumption

Inactive Publication Date: 2015-01-07
SUZHOU DEBAO KAIDI NEW MATERIAL
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the recovered carbon fiber is seriously oxidized and impacted by violent movement in reactors, separators, etc.
Therefore, the decline in mechanical properties is more serious, and the method is more complicated to operate.
The pyrolysis method is a method of thermally decomposing waste carbon fiber reinforced resin composite materials in an atmosphere of nitrogen, helium and other inert gases. The performance of the obtained carbon fiber is not uniform due to the asynchrony of the internal and external reactions, and the performance of the recycled carbon fiber will also be greatly reduced

Method used

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  • Method for recovering carbon fibers from carbon fiber composite material

Examples

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Embodiment 1

[0029] In this embodiment, the matrix resin is polypropylene, and the carbon fibers are pitch carbon fibers in the form of long fibers.

[0030] The carbon fiber composite material recovery carbon fiber method of the present embodiment comprises the following steps:

[0031] Step 1: Place the carbon fiber composite material in a microwave oven, and irradiate and heat the carbon fiber composite material in a protective atmosphere, and the carbon fiber composite material undergoes a degradation reaction in the microwave oven.

[0032] In this step, the protective atmosphere is an inert gas or a mixed gas of an inert gas and oxygen, and in the mixed gas, the oxygen content is less than or equal to 20v%. In this embodiment, the protective atmosphere is specifically an inert gas—helium; the microwave power of the microwave oven is 1KW˜100KW, specifically 5KW in this embodiment.

[0033] Step 2: After the degradation reaction is completed, the product generated by the degradation o...

Embodiment 2

[0036] The difference between this embodiment and Embodiment 1 is that step 1a is also included before step 1, the pretreatment of the carbon fiber composite material, that is, the carbon fiber composite material is divided into blocks, and in this embodiment, the carbon fiber composite material is specifically cut into A cube with an edge length of 50 cm.

[0037] The amount of carbon fiber composite material used and other steps before treatment are the same as in Example 1. After the degradation reaction is completed, the solid product is carbon fiber with a recovery rate of 99.7%, and the performance of the obtained carbon fiber is uniform.

Embodiment 3

[0039] This example differs from Example 1 in that: in step 1, the microwave power of the microwave oven is 1KW, and in step 2, the degradation reaction time is 1 hour.

[0040] The usage amount and other steps of the carbon fiber composite material before treatment are the same as in Example 1. The recovery rate of the carbon fiber in this example is 99.5%, and the performance of the obtained carbon fiber is uniform.

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Abstract

The invention discloses a method for recovering carbon fibers from a carbon fiber composite material. The method comprises the following steps: 1. putting the carbon fiber composite material in a microwave oven, carrying out radiation heating treatment on the carbon fiber composite material in a protective atmosphere to initiate degradation reaction on the carbon fiber composite in the microwave oven, wherein the protective atmosphere is an inert gas or an inert gas-oxygen gas mixture, and the oxygen content in the gas mixture is less than or equal to 20v%; and 2. after finishing the degradation reaction, obtaining the solid product which is the recovered carbon fibers. The method can obtain the regenerated carbon fiber material with uniform performance, and effectively enhances the recovery rate of the carbon fibers.

Description

technical field [0001] The invention relates to a method for recycling carbon fibers, in particular to a method for recycling carbon fibers from carbon fiber composite materials. Background technique [0002] Carbon fiber reinforced resin composite materials have excellent properties such as high specific strength, high specific modulus, heat resistance and corrosion resistance, so they are widely used in aerospace fields, sports and leisure fields such as golf clubs / tennis rackets, and automobiles / wind power generation / Electronic appliances / Medical equipment and other industrial fields. [0003] There are problems in the disposal of carbon fiber reinforced resin composite waste such as scraps generated in the manufacturing stage or scrapped products at the end of their service life. Carbon fiber-reinforced resin composites can only be burned to remove resin, and carbon fibers remain as residues. Therefore, carbon fiber-reinforced resin composite waste is usually treated a...

Claims

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Application Information

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IPC IPC(8): C08J11/10C08J11/00C08L23/12C08K7/06
CPCY02W30/62
Inventor 王新灵刘丽单玉玲
Owner SUZHOU DEBAO KAIDI NEW MATERIAL
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