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Chemical recovery method of aramid fiber reinforced composite material

A technology of reinforced composite materials and fiber composite materials, which is applied in the field of chemical recycling of aramid fiber reinforced composite materials, can solve the problems of aramid fiber performance being greatly affected, difficult to meet fiber reuse, and difficult post-processing of degradation liquid. Achieve the effects of less three wastes, low cost, and improved degradation ability

Inactive Publication Date: 2020-12-04
ADESSO ADVANCED MATERIALS WUXI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have problems such as high requirements for reaction equipment, harsh reaction conditions, difficult separation of degradation products and post-treatment of degradation liquid, and high industrialization costs. In addition, some recovery methods also have a greater impact on the performance of aramid fibers before and after recovery. Difficult to meet the value of fiber reuse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The aramid fiber reinforced composite material is prepared from aramid fiber and polyacrylic resin.

[0027] Add 1 gram of aramid fiber composite material fragments, 5 grams of ethylene glycol and 15 grams of N,N-dimethylformamide into the three-necked flask, start the stirrer to stir, heat the oil bath to 140°C and start timing, and cool down after 60 minutes of degradation reaction , Filtration of solid-liquid separation to obtain the solid intermediate product carbon fiber and liquid intermediate product degradation liquid; the obtained solid intermediate product was washed with water, dried and separated to clean aramid fiber; the obtained liquid intermediate product was decompressed and distilled to obtain the degraded The reusable high molecular resin polymer and recycled organic mixed solvent, the residual rate of aramid fiber resin is 0.3%. The monofilament tensile test of the aramid fiber recovered from the waste of aramid fiber reinforced composite material wa...

Embodiment 2

[0029] The aramid fiber reinforced composite material is prepared from aramid fiber and polyethylene resin.

[0030] Add 1 gram of aramid fiber composite material fragments, 5 grams of oxalic acid and 15 grams of 1-methyl-2-pyrrolidone into the three-necked flask, start the stirrer, heat the oil bath to 140°C and start timing, and cool down after 180 minutes of degradation reaction , Filtration of solid-liquid separation to obtain the solid intermediate product carbon fiber and liquid intermediate product degradation liquid; the obtained solid intermediate product was washed with water, dried and separated to clean aramid fiber; the obtained liquid intermediate product was decompressed and distilled to obtain the degraded The reusable high molecular resin polymer and recycled organic mixed solvent, the residual rate of aramid fiber resin is 0.2%.

Embodiment 3

[0032] The aramid fiber reinforced composite material is prepared from aramid fiber and phenolic resin.

[0033] Add 1 gram of aramid fiber composite material fragments, 5 grams of acetic acid and 5 grams of xylene mixture into a three-necked flask, start the stirrer to stir, heat the oil bath to 120°C and start timing, cool down after 60 minutes of degradation reaction, filter and separate the solid and liquid to obtain The solid intermediate product carbon fiber and the liquid intermediate product degradation liquid; the obtained solid intermediate product is washed with water, and the clean aramid fiber is separated after drying; the obtained liquid intermediate product is distilled under reduced pressure to obtain a degraded reusable polymer Resin polymer and recovered organic mixed solvent, aramid fiber resin residual rate is 0.2%.

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Abstract

The invention discloses a chemical recovery method of an aramid fiber reinforced composite material, and belongs to the technical field of aramid fiber composite material recovery. The recovery methodof the aramid fiber comprises the following steps: simultaneously putting a resin-based aramid fiber composite material and a mixed recovery solution into a sealed reaction kettle; reacting for 2-8 hours under the conditions of normal pressure and the temperature of 80-150 DEG C; and cleaning a product after the reaction to obtain the recycled aramid fiber. The method adopts a composite recoverysolvent, which improves the degradation ability of the mixed recovery solvent to the resin matrix, and improves the rupture, migration and dissolution efficiency of the polymer resin; the quality of the aramid fibers is almost not lost, the residual rate of recycled fiber resin reaches 0.5% or below, and the performance retention rate of the recycled aramid fibers can reach 95% or above; the polymer resin is dissolved in a degradation solution, and can be used as an additive for plastics, rubber elastomers or paints for secondary application after being separated by physical and chemical means; and the recovered composite recovery solution can be directly recycled.

Description

technical field [0001] The invention relates to the technical field of degradation and recovery of aramid fiber reinforced composite materials, in particular to a chemical recovery method of aramid fiber reinforced composite materials. Background technique [0002] Aramid fiber is an important military material for national defense. Its fiber-reinforced composite material has excellent properties such as high specific strength, specific modulus and high temperature resistance. With the application and promotion of aramid resin-based composite materials in the fields of aerospace, military protection, automobile transportation, electromechanical, construction and sporting goods, the leftovers produced in the production process of aramid resin-based composite materials and the service life of their products The problem of waste disposal of full reinforced resin matrix composites will become more and more significant. At present, as solid waste, aramid resin-based composite ma...

Claims

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Application Information

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IPC IPC(8): C08J11/08C08J11/02C08L33/04C08L23/06C08L61/06C08L101/02C08L77/10
CPCC08J11/08C08J11/02C08J2333/04C08J2323/06C08J2361/06C08J2300/30C08J2300/10C08J2477/10Y02W30/62
Inventor 黄永升覃兵南江琨庞兴功杨涛
Owner ADESSO ADVANCED MATERIALS WUXI CO LTD
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