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A method for recycling carbon fiber from waste carbon fiber resin matrix composites

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, improved convenience, and simple process

Active Publication Date: 2019-09-10
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 recovery efficiency, but also can overcome the problem of the quality decline of recycled carbon fibers, and provides for the recycling of carbon fiber resin-based composite materials. Technical Support

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 matrix 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] The present embodiment provides a method for recycling carbon fibers in discarded carbon fiber resin-based composite materials, and the specific steps are as follows:

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

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

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

Embodiment 2

[0038] The carbon fiber in the selected waste carbon fiber resin matrix 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] The present embodiment provides a method for recycling carbon fibers in discarded carbon fiber resin-based composite materials, and 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 the carbon fiber resin matrix composite material, record the weight of 5.658g, and calculate the carbon fiber content as 5.658x0.6=3.395g through the carbon fiber content.

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

Embodiment 3

[0048] The carbon fiber in the selected waste carbon fiber resin matrix 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] The present embodiment provides a method for recycling carbon fibers in discarded carbon fiber resin-based composite materials, and 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 the small piece of carbon fiber resin matrix composite material, record the weight of 11.072g, and calculate the carbon fiber content as 11.072x0.6=6.6432g through the carbon fiber content.

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

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Abstract

The invention relates to the technical field of carbon fiber recovery, and proposes a method for recovering carbon fibers from waste carbon fiber resin-based composite materials, which includes the following steps in turn: laying a layer of solid super acid SO on the surface of waste carbon fiber resin-based composite materials 4 2‑ / TiO 2 Powder; in an oxygen-free and inert environment, pyrolyze at 500-700°C for 10-30 minutes; in an aerobic environment, pyrolyze at 350-450°C for 10-60 minutes. The solid superacid SO proposed by the present invention 4 2‑ / TiO 2 The method of powder laying plus two-step pyrolysis treatment to recover carbon fibers not only has high recovery efficiency, but also can overcome the problem of the quality decline of recovered carbon fibers, and provide technical support for the recycling of carbon fiber resin matrix composites. The invention has simple equipment, simple technological process, low processing cost, industrial feasibility, and greatly improves the convenience of recycling carbon fiber for reuse.

Description

technical field [0001] The invention relates to the technical field of recycling 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 composites have excellent properties such as high specific strength, high specific modulus, heat resistance and corrosion resistance, so they are widely used in aerospace, golf clubs / tennis rackets and other sports and leisure fields, as well as automotive / wind power generation / Electronics / Medical equipment and other industrial fields. [0003] Carbon fiber reinforced resin composite waste materials such as scraps produced in the manufacturing stage or scrap products at the end of their service life have problems in handling them. At present, carbon fiber reinforced resin composite materials are treated as non-combustible solid waste by cutting and grinding into powder or granules as fillers, paving materials, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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