Recovery method of carbon-fiber reinforced epoxy composites

A composite material and epoxy resin technology, applied in the polymer field, can solve problems such as high pressure, high reaction temperature, and low operating safety factor, and achieve the effects of alleviating environmental pressure, mild reaction conditions, and making up for efficient recovery

Inactive Publication Date: 2012-10-17
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can obtain fibers with a clean surface and no defects, but the nitric acid used is a strong corrosive acid, the operation safety factor is low, the corrosion resistance of the reaction equipment is high, and it can only be applied to epoxy resin composite materials cured by amines Published patent CN200610151145.7 is to add thermosetting epoxy composite material, tetralin or decahydronaphthalene-based decomposition liquid and 10-30% catalyst into a stainless steel closed reaction kettle, and heat it at 280-350°C to make Epoxy resin is degraded, the reaction temperature required by this invention is high, and a large amount of catalyst is used, the loss of mechanical properties of the obtained fiber is also large, and the value of reuse is not great; their patent 200710144538.X published in 2007 is The water phase is used as the reaction environment, and 10-30% of some inorganic substances are assisted as catalysts, and the reaction is carried out at 4-6Mpa, 260-380°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Cut the desired disintegrated carbon fiber reinforced epoxy composite into volumes less than 5 cm 3 Take 6.0kg of the required decomposed carbon fiber / epoxy resin composite material block and add it to the heating reflux device with 10.0L lauric acid, heat it for 20min after boiling, wash it with industrial acetone, and then wash it with deionized water , repeated washing 5 times, and then dried in a vacuum oven at 105°C for 18h. Put the treated composite material into a closed stainless steel reaction kettle, add iodine water containing 10g of iodine and 10L of phenol per kilogram of the treated composite material, react at 50°C for 120min, and then cool naturally to room temperature to obtain the primary product . The solid product in the primary product was repeatedly washed with industrial acetone for 3 times, immersed in industrial acetone for 36 hours, and dried to obtain carbon fibers; the liquid product in the primary product was subjected to vacuum distillatio...

Embodiment 2

[0026] Cut the desired disintegrated carbon fiber reinforced epoxy composite into volumes less than 5 cm 3 Take 2.0kg of the required decomposed carbon fiber / epoxy resin composite block and add it to the heating reflux device equipped with 6.0L propionic acid, heat it for 30min after boiling, wash it with industrial acetone, and then wash it with deionized water , repeated washing 3 times, and then dried in a vacuum oven at 95°C for 16h. Put the treated composite material into a closed stainless steel reaction kettle, add 0.5kg of ozone and 20L of resorcinol per kilogram of the treated composite material, react at 70°C for 110min, and then cool naturally to room temperature to obtain primary product. The solid product in the primary product was repeatedly washed with industrial acetone for 4 times, immersed in industrial acetone for 24 hours, and dried to obtain carbon fibers; the liquid product in the primary product was subjected to vacuum distillation to obtain the liquid ...

Embodiment 3

[0028] Cut the desired disintegrated carbon fiber reinforced epoxy composite into volumes less than 5 cm 3 Take 5.0kg of the required decomposed carbon fiber / epoxy resin composite material block and add it to the heating reflux device equipped with 8.0L phenylacetic acid, heat it for 40min after boiling, wash it with industrial acetone, and then wash it with deionized water , repeated washing 3 times, and then dried in a vacuum oven at 85°C for 16h. Put the treated composite material into a closed stainless steel reaction kettle, add 100g of oxalic acid and 50L of catechol per kilogram of the treated composite material, react at 250°C for 110min, and then cool naturally to room temperature to obtain the primary product . The solid product in the primary product was repeatedly washed with industrial acetone for 5 times, immersed in industrial acetone for 36 hours, and dried to obtain carbon fibers; the liquid product in the primary product was subjected to vacuum distillation ...

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PUM

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Abstract

The invention relates to a recovery method of carbon-fiber reinforced epoxy composites. A method in the prior art has defects of strict reaction requirements and high recovery cost. The method provided in the invention comprises the steps of: cutting composites needing to be decomposed into blocks with volumes smaller than 5 cubic centimeters, placing the blocks in a reflux device filled with acid solution, heating for 5-30 minutes at a boiling temperature, drying in vacuum after washing the composites, placing the dried composites in a sealed reactor, adding materials containing hydroxyl and oxidizing agent into the sealed reactor, heating, then cooling the material to normal temperature to obtain primary products, placing and dipping solid products of the primary products in industrial acetone solution after washing the solid products, recycling to obtain carbon fiber, and carrying out liquid separation, extraction and distillation for liquid products to obtain phenol and phenol derivatives. According to the invention, the recovery is carried out under low temperature and low pressure; the reaction condition is mild; the recovery can be controlled easily; the recovery has few by-products, almost no pollution, and no equipment corrosion. The recovery method is a green recovery way.

Description

technical field [0001] The invention belongs to the technical field of macromolecules, and relates to a method for recycling waste thermosetting resin composite materials, in particular to a method for recycling carbon fiber reinforced epoxy resin composite materials. technical background [0002] Carbon fiber (CF) / epoxy resin (EP) composite material (referred to as CF / EP composite material) has the characteristics of low density, high specific strength and specific modulus, especially carbon fiber / epoxy resin composite material in the aviation field, It is widely used in high-tech fields such as the automobile industry and sporting goods. With the development of low-carbon economy, the use of carbon fiber / epoxy resin composite materials in various fields has grown rapidly, and has continued to expand to emerging fields such as: new energy, high-speed trains, etc. With the application of carbon fiber / epoxy resin composite materials in these high-tech fields, the waste of th...

Claims

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Application Information

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IPC IPC(8): C08J11/24C08J11/26C08J11/16C08L63/00C08K7/06
CPCC08J11/24C08J11/26C08J2363/00Y02W30/62
Inventor 李娟徐平来朱荧科许亮薛立新
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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