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Method for recovering carbon fiber by cracking waste carbon fiber composite material

A technology for recycling carbon fiber and composite materials, which is applied in the field of cracking and recycling carbon fiber from waste carbon fiber composite materials. It can solve the problems that affect the cutting and/or crushing processing and reuse performance of recycled carbon fiber, serious oxidation reaction of carbon fiber, and easy carbon formation on the surface of carbon fiber. Achieve the effects of improved convenience, low processing cost, and simple equipment

Active Publication Date: 2014-03-26
南通复源新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the fluidized bed method (Plastics.Rubber and Composites, 2002, Vol.31 No.6, p.278-282) is to decompose the waste carbon fiber reinforced resin composite material in hot air, which is useful for the treatment of doped metals. Heterogeneous carbon fiber-reinforced resin composite wastes have a better effect and can be operated continuously, but the recovered carbon fibers are seriously oxidized and impacted by violent movement in reactors, separators, etc., so the mechanical properties are seriously degraded. And this method is more complex
The pyrolysis method is a method of thermally decomposing waste carbon fiber reinforced resin composite materials in an inert gas atmosphere such as nitrogen and helium. The process is simple, but the surface of the recycled carbon fiber is easy to form carbon
Since there is no control over the amount of carbon, it will seriously affect the subsequent cutting and / or crushing processing and processing and recycling performance of recycled carbon fibers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The resin matrix of the selected discarded carbon fiber composite material plate is epoxy resin composite, and the weight content of carbon fiber is 63%. The carbon fiber composite material plate is broken into fragments, and the mass is weighed to be 10.0kg (the content of carbon fiber in the calculation=10.0×0.63=6.300kg) is put into the cracking furnace, and nitrogen gas is introduced into the furnace door for 5-10 minutes after closing the furnace door. The air in the furnace is completely exhausted to form an oxygen-free inert environment. Raise the temperature of the cracking furnace to 350°C, so that the resin in the carbon fiber reinforced resin composite material undergoes thermal cracking reaction for 2.0 hours at this temperature, and the cracked products are discharged out of the furnace with the airflow. Stop heating, and take out the cracking residual product after the temperature of the cracking furnace drops to normal temperature, the product is a small ...

Embodiment 2

[0028] Cracking furnace temperature is set to 600 ℃, all the other operations are identical with embodiment 1. The product is a mass of aggregated carbon fibers with a small amount of carbon on the surface. The product weighs 6.634kg. The calculated carbon content on the surface of the carbon fiber is:

[0029] (6.634-6.300) / 6.300=5.3wt%

[0030] The obtained carbon fibers were cut and pulverized, and the results showed that the carbon fibers had good processability in the subsequent cutting and / or pulverizing sections, and the obtained chopped fibers and powder fibers had good dimensional uniformity.

Embodiment 3

[0032] The temperature of the cracking furnace is set to 900°C and the thermal decomposition time is 0.5hr, and all the other operations are the same as in Example 1. The product is a mass of aggregated carbon fibers with a small amount of carbon on the surface. The product weighs 6.337kg, and the calculated carbon content on the surface of the carbon fiber is:

[0033] (6.337-6.300) / 6.300=0.58wt%

[0034] The obtained carbon fibers were cut and pulverized, and the results showed that the carbon fibers had better processability in the subsequent cutting and / or pulverizing sections, and the dimensional uniformity of the obtained chopped fibers and powder fibers was better.

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Abstract

The invention relates to a method for recovering carbon fiber by cracking a waste carbon fiber composite material, which comprises the following steps: (1) putting a waste carbon fiber composite material into the furnace cavity of a cracking device, fastening the furnace door, and introducing nitrogen gas for several minutes until air in the furnace cavity is completely discharged to form an oxygen-free inert environment; (2) heating the material in the furnace cavity to 350-900 DEG C, keeping for 0.5-5.0 hours, and blowing out the furnace to naturally cool the material in the furnace cavity, wherein the resin is subjected to thermal cracking reaction in the furnace cavity; and (3) opening the cooled furnace cavity, and taking out the product. Compared with the prior art, the carbon fiber obtained by the invention is beneficial to subsequent cutoff or pulverizing processing, and can be easily dispersed into single fiber after processing. According to the invention, the obtained carbon fiber is high in recovery rate and low in performance reduction degree; and the operating process is simple and suitable for industrial production.

Description

technical field [0001] The invention relates to a waste carbon fiber composite material, in particular to a method for cracking and recovering carbon fiber from a waste carbon fiber composite material. 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 was...

Claims

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Application Information

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IPC IPC(8): C08J11/10C08J11/00
CPCY02W30/62
Inventor 杨斌袁角亮王新灵刘媛张媛媛
Owner 南通复源新材料科技有限公司
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