Method for regenerating carbon fibers from carbon fiber-reinforced composite material wastes

A reinforced composite material, composite material technology, applied in the field of waste recycling of carbon fiber reinforced composite materials, can solve unavoidable problems and achieve the effect of low equipment cost, obvious economic benefits, and unified social and economic benefits

Inactive Publication Date: 2017-08-22
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] To sum up, every recycling method has its advantages and unavoidable disadvantages
Due to the different structures of composite materials, the resin matrix used is also very different. There is no single method that can solve the recycling problem of all composite materials. Therefore, it is necessary to develop a suitable system solution according to the characteristics of composite materials to solve the recycling of each type of material. question

Method used

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  • Method for regenerating carbon fibers from carbon fiber-reinforced composite material wastes
  • Method for regenerating carbon fibers from carbon fiber-reinforced composite material wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Carbon Fiber Reinforced Epoxy Composite Recycling.

[0029] Put the carbon fiber reinforced epoxy resin composite tube into a glass tank of corresponding size, add a mixture of concentrated sulfuric acid, alkylphenol polyoxyethylene ether and tetrahydrofuran (9:1:1), and immerse the carbon fiber reinforced composite material at room temperature. After soaking for 24 hours under static or stirring conditions, filter or centrifuge to take out the carbon fiber, wash it with clean water for several times until it is clean, dry it naturally or heat it to get the regenerated carbon fiber, and store it for later use; the soaked waste liquid is distilled to remove tetrahydrofuran, and then add hydroxide After sodium neutralization, it can be used as an additive for adhesives or paints.

Embodiment 2

[0030] Example 2 Carbon Fiber Reinforced Epoxy Composite Recycling.

[0031] Put the carbon fiber-reinforced epoxy resin composite tube into a glass tank of corresponding size, add a mixture of concentrated sulfuric acid, petroleum ether and polyethylene glycol 400 (7:2:2) to immerse the carbon fiber-reinforced composite material, stand at room temperature or After soaking for 48 hours under stirring conditions, filter or centrifuge to take out the carbon fiber, wash it with clean water for several times until it is clean, dry it naturally or heat it to obtain the regenerated carbon fiber, and store it for later use; after the soaked waste liquid is distilled to remove petroleum ether, add hydroxide After calcium neutralization, it can be used as an additive for adhesives or coatings.

Embodiment 3

[0032] Example 3 Carbon Fiber Reinforced Epoxy Composite Recycling.

[0033] Put the carbon fiber reinforced epoxy resin composite tube into a glass tank of the corresponding size, add a mixture of concentrated sulfuric acid, fatty alcohol polyoxyethylene ether and dioxane (6:5:1), and immerse the carbon fiber reinforced composite material After soaking for 36 hours at room temperature or under stirring conditions, filter or centrifuge to take out the carbon fiber, wash it with clean water for several times until it is clean, dry it naturally or heat it to obtain the regenerated carbon fiber, and store it for later use; the soaked waste liquid is distilled to remove dioxane After ringing, add calcium oxide to neutralize and use it as an additive for adhesives or coatings.

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Abstract

The invention relates to the field of recovery and use of carbon fiber-reinforced composite material wastes and concretely relates to a method for regenerating carbon fibers or their fillers through soaking a carbon fiber-reinforced composite material in a penetrating degradation agent so that the resin base swells and is degraded. The method solves the problem of degradation of the carbon fiber-reinforced composite material and regeneration and use of the high value-added carbon fibers. The method can treat carbon fiber-reinforced composite material wastes at the normal temperature under the normal pressure so that the regeneration of high value-added carbon fibers is realized, has simple processes, is free of pre-processing, can directly treat large-size carbon fiber-reinforced composite materials, saves the cost of crushing and smashing, is free of heating, reduces energy consumption, is free of pressurization, and reduces the processing equipment requirements. The regenerative carbon fiber or filler is not corroded, has small fiber damage and is subjected to clean and complete surface treatment. The method completely realizes regeneration of carbon fiber materials and cyclic utilization of the carbon fiber-reinforced composite material.

Description

technical field [0001] The invention relates to the field of recycling carbon fiber reinforced composite material waste, in particular to a method for regenerating carbon fiber from carbon fiber reinforced composite material waste, and develops a new method for recycling large-size CFRP with low energy consumption and high efficiency. The specific method is to soak the carbon fiber reinforced composite material in concentrated sulfuric acid or its osmotic degradation agent at normal temperature and pressure, so that the resin matrix is ​​swollen and degraded, and the carbon fiber or its filler is separated, and the recycled carbon fiber is obtained after washing and drying. The application field involves cities Water treatment, ship low-carbon weight reduction, intelligent network power equipment, ship sea tourism, marine anti-corrosion and seawater desalination, metallurgical iron and steel power desulfurization, mining anti-corrosion and safety of coal mines, wind power, low-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B14/38C04B24/32B09B3/00C04B26/14
CPCB09B3/00C04B14/386C04B40/0039C04B26/14C04B24/32
Inventor 赵剑英佟立海赵发林刘会陈东亮董英侠
Owner SHANDONG UNIV OF TECH
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