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Surface treatment method for recycled carbon fibers

A technology for recycling carbon fiber and surface treatment. It is applied in fiber treatment, radioactive element fiber treatment, ultrasonic/sonic fiber treatment, etc. It can solve the problems of difficulty in recycling, uneven physical and chemical states, and uneven residues on the surface of recycled carbon fibers. , to achieve the effect of enhancing interface performance, promoting high value-added applications, and high wide applicability

Inactive Publication Date: 2020-06-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a surface treatment method for recycled carbon fibers. Aiming at the problems of uneven residues on the surface of recycled carbon fibers, uneven physical and chemical states, and difficulty in reutilization, the surface materials with different surface material coverage and different physical properties can be treated by electron beam irradiation. Recycled carbon fibers in chemical, chemical and dispersed states can achieve high efficiency, full coverage and rapid modification, which can effectively improve their surface activity, enhance the interface properties with various resin matrices, improve the performance of composite materials, and promote high value-added applications of recycled carbon fibers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The three-dimensional carbon fiber fabric recovered by pyrolysis was ultrasonically cleaned with acetone for 30 minutes. Place the cleaned carbon fiber fabric in a vacuum oven and fully dry it at 60°C for 12h. Then place the carbon fiber three-dimensional fabric in a linear electron accelerator and irradiate with an electron beam with a radiation dose rate of 150kGy / h, and the total radiation dose is 300kGy; after irradiation, the mixed liquid is dried in a vacuum oven at 60°C for 12h , to obtain a solid sample.

[0028] Will Co 60 The carbon fiber three-dimensional fabrics before and after radiation modification by γ-ray radiation sources were prepared into thermosetting composite materials, using bisphenol A epoxy resin (E-51) as the matrix, methylnadic anhydride as the curing agent, and tertiary amine salt as the accelerator , mixed uniformly at room temperature, wherein the mass ratio of resin, curing agent and accelerator is 100:98.7:3. Vacuum-assisted molding w...

Embodiment 2

[0034] Use acetone to ultrasonically clean the carbon fiber precursors after the solution dissolving treatment, and the cleaning time is 30 minutes. The carbon fibers were then cut into 3 mm long chopped fibers. Mix chopped carbon fiber, diethylenetriamine, and ethyl acetate at a mass ratio of 1:1:10, and stir gently for 15 minutes under anhydrous conditions. Then place the mixed solution in C60 γ-rays, irradiate with an electron beam with an irradiation dose rate of 100kGy / h, and the total irradiation dose is 400kGy. After irradiation, the mixed liquid is dried in a vacuum oven at 60°C 12h, a solid sample was obtained.

[0035] Using Co 60 Thermoplastic composites were prepared from chopped carbon fibers before and after radiation modification by a γ-ray radiation source. Among them, polyphenylene sulfide (PPS) and polytetrafluoroethylene (PTFE) are used as mixed thermoplastic matrix, and chopped carbon fiber is used as reinforcement. The mass ratio of each component is P...

Embodiment 3

[0041] A carbon fiber reinforced thermosetting composite material is processed by a supercritical dissolution method to obtain a carbon fiber precursor. Use acetone to ultrasonically clean the carbon fiber precursors for 45 minutes. Then the carbon fiber is cut into 6-12mm long carbon fiber tow. Ethylenediamine, hexamethylenediamine, and ethyl acetate were mixed at a molar ratio of 1:1:10, then the carbon fiber strands were soaked in the mixed solution, stirred gently for 20 minutes under anhydrous conditions, and then ultrasonically dispersed for 30 minutes. Then the mixed solution was placed in a linear electron accelerator, irradiated with an electron beam with a radiation dose rate of 100kGy / h, the total radiation dose was 500kGy, and the mixed liquid was dried in a vacuum oven at 80°C for 12h after irradiation. Obtain a solid sample.

[0042] Using Co 60 The carbon fiber tows before and after radiation modification by γ-ray radiation sources were re-prepared into therm...

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Abstract

The invention relates to a surface treatment method for recycled carbon fibers. The method comprises the following steps of (1) carrying out cleaning and drying on a carbon fiber fabric to be recovered to obtain carbon fiber fibrils; and (2) placing the carbon fiber fibrils or a pretreatment liquid containing the carbon fiber fibrils in an electron irradiation source to be subjected to electron beam irradiation processing to complete. Compared to the prior art, the method is applicable to recycled carbon fibers with different surface residual resins and obtained through different recycling methods, has high wide applicability, and can shorten the treatment time, reduce the energy consumption in the surface modification reaction process, and effectively improve the interface performance between the carbon fibers and a resin matrix; and in addition, the modified recycled carbon fibers have relatively high surface activity and relatively low surface damage, are suitable for being used asa reinforcement to be re-prepared into a composite material for reuse, and the development of the high value-added reuse technology of the recycled carbon fibers is effectively promoted.

Description

technical field [0001] The invention belongs to the technical field of carbon material recycling, and relates to a surface treatment method for recycling carbon fibers. Background technique [0002] Resin-based carbon fiber composite material (hereinafter referred to as "composite material") is generally based on thermosetting resin (such as epoxy resin) or thermoplastic resin (such as polyetheretherketone), continuous carbon fiber and its fabric (unidirectional cloth, Two-dimensional woven cloth, three-dimensional woven prefabricated body) or composite materials with chopped fibers as reinforcements. It has high specific strength, high specific stiffness, corrosion resistance, excellent designability, and flexible formability. It has been widely used in national defense, aerospace, aviation, automobile, energy, construction and other fields, and has become a pillar material in important fields. one. With the continuous expansion of the application of composite materials, ...

Claims

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Application Information

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IPC IPC(8): D06M10/02D06M10/08
CPCD06M10/008D06M10/025D06M10/08
Inventor 李华陈浩昌刘河洲陈玉洁丁文江
Owner SHANGHAI JIAO TONG UNIV
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