Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (01): 15-20.doi: 10.13475/j.fzxb.20210905306

• Fiber Materials • Previous Articles     Next Articles

Carbon fiber reinforced epoxy based vitrimer composite material closed-loop recycling

LI Bo1,2, FAN Wei1,2(), GAO Xingzhong1,2, WANG Shujuan3, LI Zhihu1,2   

  1. 1. School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
    2. Key Laboratory of Functional Textile Material and Product, Ministry of Education, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
    3. School of Chemistry, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
  • Received:2021-09-15 Revised:2021-11-05 Online:2022-01-15 Published:2022-01-28
  • Contact: FAN Wei E-mail:fanwei@xpu.edu.cn

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Abstract:

In order to solve the problem of low recycling efficiency and single recycling component of continuous carbon fiber reinforced resin matrix composite material (CFRP), methyl tetrahydrophthalic anhydride, tetrahydrophthalic anhydride, catalyst zinc acetylacetonate and epoxy resin were used to prepare a high-performance epoxy based vitrimer resin and its composite material. A closed-loop recycling was conducted involving the transesterification reaction of ethylene glycol (EG) at 180 ℃. Ethylene glycol participates in the transesterification reaction, and the composite material is recovered in a closed loop at 180 ℃. The apparent structure, thermal stability and mechanical properties of raw resin, carbon fiber and CFRP, recovered resin, carbon fiber and CFRP prepared from recovered resin and recovered carbon fiber were characterized and analyzed. The results show that the recoverying method can completely recover and reprocess the resin and carbon fiber of the composite material. After recycling, the retention rate of the tensile strength of the resin is 90.1%, the retention rate of the tensile strength of the carbon fiber monofilament is 98.9%, and the retention rate of the flexural strength and shear strength of CFRP are 86.2% and 86.7%, respectively.

Key words: carbon fiber, composite material, carbon fiber reinforced resin matrix composite material, closed-loop recycling, reprocessing

CLC Number: 

  • TB332

Fig.1

Curing process of epoxy based vitrimer. (a) Catalysis, ring opening reaction;(b) Ring opening reaction;(c) Transesterification reaction"

Fig.2

Closed-loop recycling flow chart of composite material"

Fig.3

SEM images of carbon fiber. (a) Raw carbon fiber;(b) Recovered carbon fiber"

Fig.4

Infrared spectra of raw epoxy resin and recovered epoxy resin"

Fig.5

Alcoholysis process of epoxy based vitrimer"

Fig.6

Thermal stability curve of raw carbon fiber and recovered carbon fiber"

Fig.7

Bending stress-strain curve of raw CFRP and recovered CFRP"

Fig.8

Shear stress-strain curve of raw CFRP and recovered CFRP"

Fig.9

Tensile stress-strain curve of raw resin casts and recovered resin casts"

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