Method for recycling carbon fiber reinforced resin matrix composites by supercritical mixed fluids

A resin-reinforced, carbon fiber-recycled technology, which is applied in plastic recycling, recycling technology, and bulk chemical production, can solve the problems of high recycling costs and low recycling efficiency, and achieve reduced recycling costs, reduced usage, and decomposition time The effect of shortening

Inactive Publication Date: 2017-03-15
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of low recycling efficiency and high recycling cost in the prior art, the present invention proposes to use supercritical alcohol-water mixed fluid to recycle carbon fiber reinforced resin-based composite materials, in order to realize efficient and low-cost recycling of composite materials

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0028] The carbon fiber / epoxy resin composite material is used as the recycling object, and water, n-butanol, and n-butanol-water mixed solvent are used as the reaction medium, and the content is 500mL. The water and n-butanol in the n-butanol-water mixed solvent are The mass fractions are all 50%, the critical temperature of n-butanol-water binary mixture is 344.6℃, and the critical pressure is 22.1MPa. When the set temperature is 350℃, the water reaches the subcritical state, the n-butanol reaches the supercritical state, and the n-butanol-water binary mixture reaches the supercritical state. When the reaction time is all 30 minutes, the solid phase after the reaction is taken out The product, the solid phase product is washed with acetone, and then dried in a drying box, and the decomposition rate of the epoxy resin is calculated.

[0029] The decomposition rate of supercritical n-butanol-water mixed fluid to epoxy resin is 90.38%, the decomposition rate of subcritical water t...

Embodiment 2

[0032] Take carbon fiber / epoxy resin composite material as the object of recycling, the mass ratio of it to the solid catalyst KOH is 5:1, the content of n-butanol-water binary mixture is 500mL, and the mass fractions of water and n-butanol are both 50% , The critical temperature of the binary mixture of n-butanol-water is 344.6℃, and the critical pressure is 22.1MPa. When the temperature is set to 350℃, the n-butanol-water binary mixture reaches the supercritical state. When the reaction time is 10 minutes, the solid phase product after the reaction is taken out, the solid phase product is washed with acetone, and then placed in the drying box After drying, the decomposition rate of epoxy resin is calculated to be 95%. When the composite material and the basic solid catalyst are uniformly mixed in advance, and the supercritical alcohol-water mixed fluid is used to recover the composite material, the basic solid catalyst is transformed into an ionic liquid or molten state at 31...

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Abstract

The invention discloses a method for recycling carbon fiber reinforced resin matrix composites by supercritical mixed fluids. The recycling method includes the steps: 1 cutting the waste carbon fiber reinforced resin matrix composites into composite blocks, placing the composite blocks in a reactor, adding alkali solid catalysts into the reactor and performing temperature programming for the reactor to reach the temperature of 90 DEG C; 2 pumping alcohol and water in fixed proportion into the reactor, continuously heating the reactor to reach the temperature of 310-360 DEG C, enabling alcohol-water binary mixture to reach a supercritical state and transforming the alkali solid catalysts into ionic liquid; 3 cooling the reactor to 80 DEG C after reaction; 4 taking out solid products and drying the solid products at constant temperature. According to the recycling method, composite recycling cost is substantially reduced, recycling efficiency is improved, and the recycling method can be industrially used for the field of recycling and reusing of thermosetting plastics and the carbon fiber reinforced resin matrix composites.

Description

Technical field [0001] The method for recycling carbon fiber-reinforced resin-based composite materials based on supercritical alcohol-water mixed fluid proposed by the present invention specifically relates to a method for degrading thermosetting polymers and recycling fiber-reinforced resin-based composite materials with high efficiency and low cost. Background technique [0002] Carbon fiber-reinforced plastic. CFRP is used in aerospace, strategic weapons, transportation, medical equipment, sporting goods, wind power, etc. due to its excellent corrosion resistance, thermal stability, high strength and impact resistance. It has been widely used in many fields. With the continuous expansion of CFRP application fields, the amount of discarded CFRP has also increased. The discarded CFRP mainly comes from leftovers, defective products and structural parts damaged during use, and discarded CFRP at the end of the life cycle. Products. It is predicted that the global waste of CFRP p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/24C08J11/14C08J11/16
CPCC08J11/14C08J11/16C08J11/24C08J2363/00Y02P20/54Y02W30/62
Inventor 成焕波张杰张敏
Owner NANJING INST OF TECH
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