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Method for catalytically decomposing carbon fiber-reinforced thermosetting epoxy resin composite material

A technology of epoxy resin and composite materials, applied in plastic recycling, recycling technology and other directions, can solve the problems of difficult separation, use, degradation of fiber characteristics, etc., to achieve less by-products, mild reaction conditions, and easily controllable reaction progress. Effect

Active Publication Date: 2010-12-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented process uses sulfur dioxide (SO2)2-) type liquid crystal molecules called S023S044, an ionized form thereof, instead of traditional acids like hydrochloric acid used previously. These new methods allow for better control over chemical reactions during thermal treatment without causing damage from excessive heat exposure. Additionally, they are environment friendly because they use only water vapor while producing fewer harmful substances compared to previous processes. Overall these technical results improve efficiency and quality in treating carbon fibers reinforce thermoplastic epoxy matrix compositions.

Problems solved by technology

This patents discuss various ways how different types of composites made from CFRP (Carbon Fiber Reinforce Plastic) could become waste when they were discarded during manufacturing processes like aeronautical flight control radar antenna panels due to environmental concerns associated therewith. Current solutions involve either disposable plates containing residual parts of the composite being treated separately or reused at significant expense through combustion techniques involving expensive equipment. There remains room for improvement in this area because current technologies require long periods of time and resources to dispose of spent thermal resistant polymer matrix composite materials without causing damage or contamination issues.

Method used

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  • Method for catalytically decomposing carbon fiber-reinforced thermosetting epoxy resin composite material
  • Method for catalytically decomposing carbon fiber-reinforced thermosetting epoxy resin composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 0.32 g of CF / EP composite material, 0.61 g of solid acid SO into the three-necked flask 4 2- / ZrO 2 , 0.12 g FeSO 4 and 10 milliliters of N,N-dimethylformamide, start the stirrer to stir, and then slowly drop in 20 milliliters of 30% aqueous hydrogen peroxide solution after heating to 50°C in a water bath, then raise the temperature to 80°C for 12 hours, and stop the reaction After cooling, filtering and solid-liquid separation, solid intermediates and liquid intermediates are obtained; the obtained solid intermediates are washed with water, and after drying, clean carbon fibers and reusable solid superacids are separated; the obtained liquid intermediates are decompressed Distillation yields a decomposed reusable thermosetting epoxy residue. Among them, the carbon fiber recovery rate is 95%. The SEM image of the recovered carbon fiber is shown in Figure 1. It can be seen that the surface is basically free of defects and impurities, and can be reused.

Embodiment 2

[0030] Add 0.70 g of CF / EP composite material, 0.80 g of solid acid SO into the three-necked flask 4 2- / Fe 2 o 3 , 0.42 g FeSO 4 and 20 milliliters of ethanol, start the stirrer to stir, after heating to 45 DEG C, slowly drop into 50 milliliters of aqueous hydrogen peroxide solution with a concentration of 30%, then heat up to 70 DEG C and react for 16 hours, cool after stopping the reaction, and filter for solid-liquid separation to obtain Solid intermediates and liquid intermediates; the solid intermediates are washed with water and dried to separate clean carbon fibers and reusable solid superacids; the liquid intermediates are distilled under reduced pressure to obtain decomposed reusable thermosetting epoxy Resin residue. Among them, the carbon fiber recovery rate is 96%, and the surface of the recycled carbon fiber is similar to that shown in Figure 1, basically without defects and impurities, and can be reused.

Embodiment 3

[0032] Add 0.27 g of CF / EP composite material, 0.42 g of solid acid SO in the three-necked flask 4 2- / Fe 2 o 3 , 0.17 g FeSO 4and 10 milliliters of N, N-dimethylformamide, start the stirrer, slowly drop in 40 milliliters of 30% aqueous hydrogen peroxide solution after heating to 50°C, then raise the temperature to 80°C for 10 hours, stop the reaction and then cool , filtering solid-liquid separation to obtain solid intermediates and liquid intermediates; washing the solid intermediates with water, drying and separating clean carbon fibers and reusable solid superacids; distilling the liquid intermediates under reduced pressure to obtain decomposed Reusable thermosetting epoxy residue. Among them, the carbon fiber recovery rate is 96%, and the surface of the recycled carbon fiber is similar to that shown in Figure 1, basically without defects and impurities, and can be reused.

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Abstract

The invention discloses a method for catalytically decomposing a carbon fiber-reinforced thermosetting epoxy resin composite material. In the method, SO4<2->/MxOy solid superacid is taken as a catalyst; and the method comprises the following steps of: reacting hydrogen peroxide serving as an oxidant with the carbon fiber-reinforced thermosetting epoxy resin composite material to oxidatively decompose thermosetting epoxy resin into the homologues of benzene or phenol and dissolve in an organic solvent, cooling, separating solid form liquid, washing the obtained solid, drying, separating carbon fiber and the SO4<2->/MxOy solid superacid, and distilling the obtained liquid under reduced pressure to obtain decomposed thermosetting epoxy resin residue. Compared with the prior art, the method for catalytically decomposing the carbon fiber-reinforced thermosetting epoxy resin composite material has the advantages of high decomposition efficiency, environmental protection and easy realization, and is a method for recovering the waste carbon fiber-reinforced thermosetting epoxy resin composite material in an environmentally friendly way, wherein the recovery rate of carbon fiber can reach over 95 percent, and the recovered carbon fiber has basically complete surface, does not have residual impurity, and can be recycled.

Description

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Claims

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Application Information

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Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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