Recovery method of carbon-fiber reinforced resin-base composite material with pretreatment modes

A technology for reinforcing resin-based and composite materials, applied in plastic recycling, recycling technology, bulk chemical production, etc., can solve the environmental hazards of chemical solvents, high energy consumption, and low decomposition ability, etc., to reduce supercritical reaction conditions , improve mass diffusion, improve the effect of recycling efficiency

Active Publication Date: 2014-07-02
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Supercritical CO 2 The fluid mainly causes the polymerization to swell, plasticize and reduce its glass transition temperature, and its ability to decompose the polymer resin matrix is ​​small, and the above method does not use a certain pretreatment method before using supercritical fluid to recycle carbon fiber composites. Carbon fiber and resin matrix interfacial bonding properties and pre-destruction of resin matrix structure to improve supercritical CO 2 The mass diffusion of the fluid in the resin matrix, therefore, the resin matrix in the composite is less susceptible to super

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this embodiment, the carbon fiber reinforced epoxy resin composite material is recycled according to the following steps:

[0034] Step 1. Pretreatment of carbon fiber reinforced epoxy resin composites

[0035]Use a hand-held angle grinder to install a grinding wheel with an abrasive particle size of 46#, control the cutting speed to 40m / s, use the grinding wheel to cut the carbon fiber reinforced epoxy resin composite material into a small piece with a volume of 40mm×35mm×3mm, and the mass is 7g, using wet heat treatment, that is, taking 7d as a cycle, immersing the cut carbon fiber reinforced epoxy resin composite material in distilled water at a temperature of 70°C for two cycles, and then using filter paper to dry the surface moisture of the composite material to obtain pretreated carbon fiber To reinforce the epoxy resin-based composite material, put the pretreated carbon fiber reinforced epoxy resin-based composite material into the reaction kettle. Moist heat...

Embodiment 2

[0043] In this embodiment, the carbon fiber reinforced phenolic resin composite material is recovered according to the following steps:

[0044] Step 1. Pretreatment of carbon fiber reinforced phenolic resin composites

[0045] Use a pure water jet with a jet pressure of 350MPa to treat the carbon fiber reinforced phenolic resin composite material into a small piece with a volume of 40mm×35mm×3mm and a mass of 6.5g, and use a pure water jet with a jet pressure of 250MPa-300MPa to impact the cut carbon fiber Reinforce the phenolic resin composite material, and then use filter paper to dry the surface moisture of the composite material to obtain a pretreated carbon fiber reinforced phenolic resin based composite material, and put the pretreated carbon fiber reinforced phenolic resin composite material into the reaction kettle. Water jet impact treatment can reduce the interfacial bonding performance of carbon fiber reinforced phenolic resin composites and pre-destroy the structu...

Embodiment 3

[0053] The present embodiment reclaims the carbon fiber reinforced polyethylene terephthalate composite material according to the following steps:

[0054] Step 1. Pretreatment of the carbon fiber reinforced polyethylene terephthalate composite material

[0055] Use SiC abrasive water jet with jet pressure of 150MPa-200MPa to process the carbon fiber reinforced polyethylene terephthalate composite material into a small piece with a volume of 40mm×45mm×2mm and a mass of 7g, and then use the cycle acceleration according to the following steps Aging treatment cut carbon fiber reinforced polyethylene terephthalate composite material to obtain pretreated carbon fiber reinforced polyethylene terephthalate composite material, pretreated carbon fiber reinforced polyethylene terephthalate resin The composite material is placed in the reactor.

[0056] Step a: Soak the cut carbon fiber reinforced polyethylene terephthalate composite material in distilled water at a temperature of 90°C ...

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Abstract

The invention discloses a recovery method of a carbon-fiber reinforced resin-base composite material with pretreatment modes, which is characterized by comprising the following steps: carrying out heat-moisture treatment, loop speed-up aging treatment or water-jet impact treatment on a carbon-fiber reinforced resin-base composite material, and carrying out supercritical reaction to obtain high-performance carbon fibers, thereby implementing recovery of the carbon-fiber reinforced resin-base composite material. The heat-moisture treatment and loop speed-up aging treatment in the method enable the interfacial structure of the material to generate new pores and cracks, so that the resin base generates the phenomena of swelling and plasticizing, the pore size in the resin base is increased, and a small amount of resin base is stripped from the carbon fibers; the water-jet impact treatment mode can lower the interfacial bonding property of the material and previously destroy the structure of the resin base; all the three modes can enhance the mass diffusion of the supercritical fluid in the resin base, accelerate the degradation of the resin base in the supercritical fluid environment and enhance the recovery efficiency of the carbon fibers.

Description

technical field [0001] The invention relates to the field of recovery and utilization of carbon fiber composite materials, in particular to a method for recycling carbon fiber reinforced resin-based composite materials with a pretreatment method using supercritical fluid technology, and the recovered solid product is high-purity carbon fiber with excellent mechanical properties. Background technique [0002] The leftovers, defective products, structural parts damaged during use and scrap products beyond the service life of carbon fiber reinforced resin-based composite materials in the production process contain a large amount of expensive carbon fibers, and their recovery and recycling are becoming a key issue. question. Carbon fiber-reinforced resin matrix composites are multi-phase materials composed of reinforced carbon fibers and resin matrix. Due to the interfacial bonding effect between carbon fiber and resin matrix and the existence of interfacial chemical bonds, the ...

Claims

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Application Information

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IPC IPC(8): C08J11/08C08J11/06C08J11/16C08J11/00C08L63/00C08L61/06C08L67/02C08K7/06
CPCY02P20/54Y02W30/62
Inventor 黄海鸿成焕波李振文殷晏珍刘志峰
Owner HEFEI UNIV OF TECH
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