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Swelling dissociation recovery method for waste carbon fiber reinforced resin-based composite material

A technology for reinforcing resin-based and composite materials, which is applied in the fields of plastic recycling and recycling technology, which can solve the problems of swelling softening, high delamination and dissociation temperature, and high degradation rate of epoxy resin, and achieve mild swelling, dissociation and recycling reaction conditions , the effect of avoiding environmental pollution problems

Pending Publication Date: 2022-05-27
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acetic acid swelling method has a higher swelling softening and delamination dissociation temperature for CFRP (140°C-220°C), and the degradation rate of epoxy resin in CFRP in acetic acid swelling medium is too high (resin degradation rate 5%-23%)

Method used

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  • Swelling dissociation recovery method for waste carbon fiber reinforced resin-based composite material
  • Swelling dissociation recovery method for waste carbon fiber reinforced resin-based composite material
  • Swelling dissociation recovery method for waste carbon fiber reinforced resin-based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Dimethylacetamide and 1,3-dimethyl-2-imidazolinone were made into a thermosetting epoxy resin swelling agent according to the volume ratio of 90:10; the whole or cut large piece CFRP was immersed in the swelling agent, and the swelling reactor was sealed for swelling treatment, the swelling reaction temperature was 160 °C, the treatment time was 1 h, and the liquid-to-liquid ratio was 40:1. CFRP is removed from the swelling agent and drained of the swelling agent attached to the surface of the CFRP, at which time the CFRP is delaminated and the resin degradation rate is 0.70%. The layered carbon fiber composite is cut into uniformly shaped rectangular sheets (20 mm wide, 80 mm long, 0.2 mm thick). The swelling agent contained in the CFRP cutting product is recovered by drying or vacuum distillation; a certain amount of liquid epoxy resin is added to the dried CFRP cutting product, and the carbon fiber reinforced resin matrix composite material of different shapes and thickn...

Embodiment 2

[0024]Dimethylacetamide and 1,3-dimethyl-2-imidazolinone are made into a thermosetting epoxy resin swelling agent according to the volume ratio of 98:2; the whole or cut large piece CFRP is immersed in the swelling agent, and the swelling reactor is sealed for swelling treatment, the swelling reaction temperature is 100 °C, the treatment time is 1 h, and the liquid-solid ratio is 20:1. CFRP is removed from the swelling agent and drained of the swelling agent attached to the surface of the CFRP, at which time the CFRP undergoes swelling and softening, but it is not delaminated, and the resin degradation rate does not exceed 0.1%. The swelling softening product is cut into thin strips 100 mm long, 2 mm wide and 2 mm thick. The swelling agent contained in the CFRP cutting product is recovered by drying or reduced pressure distillation; a certain amount of liquid epoxy resin is added to the dried CFRP cutting product, and the carbon fiber reinforced resin matrix composite material of ...

Embodiment 3

[0026] Dimethylacetamide and 1,3-dimethyl-2-imidazolinone were made into a thermosetting epoxy resin swelling agent according to the volume ratio of 95:5; the whole or cut large piece CFRP was immersed in the swelling agent, and the swelling reactor was sealed for swelling treatment, the swelling reaction temperature was 140 °C, the treatment time was 1 h, and the liquid-solid ratio was 30:1. CFRP is removed from the swelling agent and drained of the swelling agent attached to the surface of the CFRP, at which time the CFRP is delaminated and the resin degradation rate does not exceed 0.2%. The layered carbon fiber composite is cut into square sheets (100 mm long, 100 mm wide, 0.2 mm thick). The swelling agent contained in the CFRP cutting product is recovered by drying or vacuum distillation; after coating the surface of the cut square carbon fiber composite material with epoxy resin, the multi-layer carbon fiber sheets are neatly stacked together, and the square carbon fiber boa...

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Abstract

The invention relates to a waste carbon fiber reinforced resin-based composite material swelling dissociation recovery method, which comprises the following steps: firstly, preparing dimethylacetamide and 1, 3-dimethyl-2-imidazolinone into a swelling agent according to a volume ratio of (80-100): (0-20); the waste carbon fiber composite material is immersed in a swelling agent for swelling treatment, the swelling temperature is 60-160 DEG C, the treatment time is 0.5-6 h, and the mass ratio of the swelling agent to the carbon fiber composite material is (10-100): 1; the swelling process conditions are regulated and controlled, so that the carbon fiber composite material is softened or layered; the swelling product is cut into slices, long strips and the like, and then the swelling agent in the swelling product is recycled; and then a proper amount of resin is added into a cut product, a new carbon fiber reinforced resin-based composite material is prepared through a mold pressing process, and the bending strength of a regenerated product can reach about 76%-95% of that of an original carbon fiber composite material. Compared with the prior art, the method disclosed by the invention has the advantages of simple process, low cost, small environmental pollution, high economic value of regenerated carbon fiber products and wide industrial application prospect.

Description

Technical field [0001] The present invention relates to a waste carbon fiber epoxy resin composite material recycling technology field, in particular to a waste carbon fiber reinforced resin matrix composite swelling dissociation recovery method. Background [0002] Carbon fiber reinforced resin matrix composites (CFRP) are widely used in aerospace, wind power blades, transportation, bridge construction and other fields because of their light weight, high strength and corrosion resistance. The widespread application of CFRP in daily life has led to an increase in the amount of waste CFRP generated year by year. CFRP scrap consists mainly of expired prepregs, remaining corner materials and scrapped CFRP products. It is expected that by 2025, the number of discarded CFRP generated worldwide each year will reach 2×10 4 t left and right. Waste CFRP contains a large number of refractory epoxy resin, landfill treatment will occupy a lot of land, incineration treatment will cause air po...

Claims

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Application Information

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IPC IPC(8): C08J11/08C08L63/00C08K7/06C08L55/02C08J5/04
CPCC08J11/08C08J5/042C08J2363/00C08K7/06C08J2463/00C08J2355/02C08J2455/02Y02W30/62
Inventor 邢明飞毋利利白雪健王雅萍李紫馨
Owner HENAN POLYTECHNIC UNIV
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