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

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 ...

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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 supercritical CO 2 Fluid decomposition affects the recovery efficiency of carbon fiber, and the energy consumption of the supercritical reaction process is relatively high

Chinese invention patents CN101787145A (disclosure date 2010.07.28) and CN102115547A (disclosure date 2011.07.06) propose to use solvent method to recover carbon fiber in carbon fiber reinforced resin-based composite material, the mechanical properties of the recovered carbon fiber are greatly lost, and the chemical solvent is harmful to the The environment causes certain harm, and it is difficult to form industrialization