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Method of decomposing thermoset epoxy resin and its composite material

A technology of epoxy resin and composite materials, applied in the direction of plastic recycling, recycling technology, etc., can solve the problem that reinforcing fibers cannot be separated and recycled

Inactive Publication Date: 2007-06-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Thermosetting epoxy resin composites can also be physically recycled, but the reinforcing fibers that have recycling value will not be separated and recycled
S.R.Farber studied a resin extractor that can mechanically separate matrix resin and fibers from epoxy resin prepreg waste; Pannkoke et al. studied the method of recycling epoxy resin prepreg waste at low temperature; L.Monney et al. used X-ray analysis The possibility of electrochemically degrading epoxy resin composites was studied by method and infrared spectroscopy; after Peninsula Copper Industrial Company removed the copper of the circuit board (glass fiber / epoxy), it was calcined to remove the epoxy adhesive and obtain a resin-free These fibers are cut into short fibers of a certain length, which can be used as reinforcements for thermosetting polyester resins; the Brooklyn Institute of Technology in the United States studies the use of pyrolysis to recycle carbon fibers from prepregs, and performs thermal cracking at 300-600°C. Raw materials and carbon fibers, recycled carbon fibers are used as soil amendments, and products such as gas and oil are used as fuels; however, the above-mentioned treatment methods are only applicable to epoxy resin prepregs, not suitable for recycling cured cross-linked thermosetting epoxy resin composite material

Method used

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Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0006] Specific embodiment one: the thermosetting epoxy resin of this embodiment is decomposed by the following steps: (1) add thermosetting epoxy resin and decomposition solution to the reaction kettle in the ratio of 10~25g: 100mL; (2) put the reaction kettle into Decompose in a salt bath furnace at a temperature of 280° C. to 350° C. for 1 to 2 hours to complete the decomposition of the thermosetting epoxy resin; wherein the decomposition liquid is a partially hydrogenated aromatic compound.

[0007] In this embodiment, the whole process is pollution-free, and the equipment used is simple and easy to operate. More than 95% of the decomposition products of thermosetting epoxy resins are benzene homologues and phenol homologues by using infrared spectroscopy and gas chromatography-mass spectrometry on-line analysis; according to the principle of chemical similarity and compatibility, thermosetting epoxy resins are completely soluble in partially hydrogenated aromatics after de...

specific Embodiment approach 2

[0008] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step (1), thermosetting epoxy resin and decomposition solution are added to the reactor in the ratio of 15-22g: 100mL. Other steps are the same as those in Embodiment 1.

specific Embodiment approach 3

[0009] Specific embodiment three: the difference between this embodiment and specific embodiment one is: in step (1), thermosetting epoxy resin and decomposition solution are added to the reactor in the ratio of 20g: 100mL. Other steps are the same as those in Embodiment 1.

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Abstract

The method of decomposing thermoset epoxy resin and its composite material is for recovering and reusing thermoset epoxy resin and its composite material. The method of decomposing thermoset epoxy resin includes the steps of adding thermoset epoxy resin and decomposing liquid into reaction kettle; and decomposing. The method of decomposing thermoset epoxy resin composite material includes the steps of adding thermoset epoxy resin composite material and decomposing liquid into reaction kettle; decomposing; solid-liquid separating; and washing and stoving solid matter to obtain decomposed thermoset epoxy resin and reinforcing fiber. The present invention has thermoset epoxy resin decomposing rate of 90-100 % and reinforcing fiber recovering rate of 100 %, and the decomposed product is separated and reused as chemical material.

Description

technical field [0001] The present invention relates to methods for decomposing epoxy resins and composite materials thereof. Background technique [0002] Thermosetting epoxy resin and thermosetting epoxy resin composite materials added with reinforcing fibers have the characteristics of light weight, good corrosion resistance, excellent electrical properties, wide source of materials, easy processing and molding, high production efficiency and material designability, etc., and are widely used It is used in various fields such as electronics industry, automobile industry, sports industry, aerospace, etc., and its usage is increasing rapidly year by year. However, thermosetting epoxy resins and thermosetting epoxy resin composites are difficult to recycle and reuse due to the properties of thermosetting epoxy resins that are infusible, insoluble, and incapable of being decomposed by microorganisms. [0003] At present, there is a physical recycling method for recycling ther...

Claims

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Application Information

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IPC IPC(8): C08J11/20C08L63/00
CPCY02W30/62
Inventor 刘宇艳孟令辉黄玉东李梨
Owner HARBIN INST OF TECH
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