Method for recycling carbon fibers from waste carbon fiber resin matrix composite material

A technology based on carbon fiber resin and recycled carbon fiber, which is applied in the fields of fiber chemical characteristics, carbon preparation/purification, products, etc., can solve the problems of carbon fiber quality decline, etc., and achieve the effect of simple equipment, low processing cost and good scale uniformity

Active Publication Date: 2017-07-18
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above problems, the present invention proposes a method for recovering carbon fibers from waste carbon fiber resin-based composite materials. This method not only has high r...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The carbon fiber in the selected waste carbon fiber resin-based composite material is Toray T700, the resin matrix is ​​4,4'-diaminodiphenylmethane epoxy resin, the curing agent is diaminodiphenylsulfone (DDS), and the carbon fiber is PAN-based carbon fiber , The form of carbon fiber is continuous fiber, and the weight content of carbon fiber is 60%.

[0028] This embodiment provides a method for recycling carbon fibers in waste carbon fiber resin-based composite materials, the specific steps are as follows:

[0029] 1. Cut the 2mm thick carbon fiber resin matrix composite carbon fiber resin matrix composite material into 25cm 2 small pieces;

[0030] 2. Weigh the small piece of carbon fiber resin matrix composite material, and record the weight as 15.014g. According to the carbon fiber content, the carbon fiber content is calculated as 15.014x0.6=9.008g;

[0031] 3. Spread it with a layer of solid super acid SO 4 2- / TiO 2 After the powder is put into the pyrolysi...

Embodiment 2

[0038] The carbon fiber in the selected waste carbon fiber resin-based composite material is Toray T700, the resin matrix is ​​4,4'-diaminodiphenylmethane epoxy resin, the curing agent is diaminodiphenylsulfone (DDS), and the carbon fiber is PAN-based carbon fiber , The form of carbon fiber is long fiber, and the weight content of carbon fiber is 60%.

[0039] This embodiment provides a method for recycling carbon fibers in waste carbon fiber resin-based composite materials, the specific steps are as follows:

[0040] 1. Cut the 2mm thick carbon fiber resin matrix composite material into 10cm 2 of small pieces.

[0041] 2. Weigh a small piece of carbon fiber resin-based composite material, and record the weight as 5.658g. According to the carbon fiber content, the carbon fiber content is calculated to be 5.658x0.6=3.395g.

[0042] 3. Spread it with a layer of solid super acid SO 4 2- / TiO 2 After the powder is put into the pyrolysis furnace, among them, SO 4 2- / TiO 2 ...

Embodiment 3

[0048] The carbon fiber in the selected waste carbon fiber resin-based composite material is Toray T700, the resin matrix is ​​4,4'-diaminodiphenylmethane epoxy resin, the curing agent is diaminodiphenylsulfone (DDS), and the carbon fiber is pitch-based carbon fiber , The form of carbon fiber is short fiber, and the weight content of carbon fiber is 60%.

[0049] This embodiment provides a method for recycling carbon fibers in waste carbon fiber resin-based composite materials, the specific steps are as follows:

[0050] 1. Cut the 2mm thick carbon fiber resin matrix composite material into 20cm 2 of small pieces.

[0051] 2. Weigh a small piece of carbon fiber resin-based composite material, and record the weight as 11.072g. According to the carbon fiber content, the carbon fiber content is calculated as 11.072x0.6=6.6432g.

[0052] 3. Spread it with a layer of solid super acid SO 4 2- / TiO 2 After the powder is put into the pyrolysis furnace, among them, SO 4 2- / TiO ...

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Abstract

The invention relates to the technical field of recycling of carbon fibers and discloses a method for recycling carbon fibers from a waste carbon fiber resin matrix composite material. The method comprises the following steps: paving a layer of solid superacid SO4<2>/TiO2 powder on the surface of the waste carbon fiber resin matrix composite material; carrying out pyrolysis at 500-700 DEG C for 10-30 minutes in an anaerobic inert environment; and carrying out pyrolysis at 350-450 DEG C for 10-60 minutes in an aerobic environment. According to the method for recycling the carbon fibers by paving solid superacid SO4<2>-TiO2 powder and carrying out two-step pyrolysis treatment, the recycling efficiency is high, the problem that the quality of recycled carbon fibers is lowered is solved, and technical support is provided for cyclic utilization of the carbon fiber resin matrix composite material. The method has the beneficial effects that equipment is simple, the technical process is simple, and the treatment cost is low; and the method has industrial feasibility, and the reutilization convenience of the recycled carbon fibers is greatly improved.

Description

technical field [0001] The invention relates to the technical field of recycled carbon fibers, in particular to a method for recycling carbon fibers from waste carbon fiber resin-based 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. At present, carbon fiber reinforced resin composite materials are treated as non-combustible solid wastes, which are processed into powder or granules as fillers, pa...

Claims

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Application Information

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IPC IPC(8): C08J11/16C08K7/06C08K7/00
CPCC08J11/16C08K7/00C08K7/06C10B53/07C10B57/06Y02P20/143C01B32/05B29B2017/0496B29B17/04D01F9/12
Inventor 隋刚金鑫杨小平朱明王占东
Owner BEIJING UNIV OF CHEM TECH
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