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Method for degradation of composite material by directional bond breaking and recovery of fiber from composite material

A composite material and recycled fiber technology, applied in the field of recycled fiber, can solve the problems of low fiber mechanical strength retention rate, difficulty in large-scale application, low degradation rate of thermosetting resin, etc., to achieve easy industrial application, easy separation, purification and reuse, Simple Effects of Components

Active Publication Date: 2019-12-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of this, the present invention aims to propose a method for directional bond breaking to degrade composite materials and recover fibers therefrom, to solve the problems of high energy and material consumption, low degradation rate of thermosetting resin, low retention rate of fiber mechanical strength, complex process, and reaction conditions. Harsh, random bond breaking of thermosetting resins, complex components of liquid phase products, and difficulty in large-scale application, using thermal solvent effect and unsaturated complexation and weak complexation to degrade fiber-reinforced thermosetting resin-based composites and recycle fibers, No preprocessing is required, the whole process only needs one step

Method used

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  • Method for degradation of composite material by directional bond breaking and recovery of fiber from composite material
  • Method for degradation of composite material by directional bond breaking and recovery of fiber from composite material
  • Method for degradation of composite material by directional bond breaking and recovery of fiber from composite material

Examples

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Embodiment 1

[0034] A method for directional bond breaking to degrade composite materials and recover fibers therefrom, comprising the steps of:

[0035] 1) if figure 1 As shown, cut the carbon fiber / phenolic resin composite material into a square with a length of about 3cm, a width of about 1cm, and a thickness of about 4mm, and set aside;

[0036]2) Place the carbon fiber / phenolic resin composite material block in a 50mL reaction kettle, add 5mL water, 10mL n-propanol, 5mL acetone, 2ml N,N-dimethylformamide, 3ml tetrahydrofuran, 1.2g anhydrous zinc chloride , 0.2g disodium edetate, 1.5g potassium hydroxide, 0.5g sodium nitrate, then seal the reaction kettle, heat up to 250°C, and keep it warm for 4 hours (heat treatment), so that the carbon fiber / phenolic resin composite material block is degraded Completely, then, naturally cool to room temperature, and carry out high-speed centrifugation, make carbon fiber separate from reaction liquid phase product, obtain carbon fiber crude product,...

Embodiment 2

[0043] A method for directional bond breaking to degrade composite materials and recover fibers therefrom, comprising the steps of:

[0044] 1) Cut the glass fiber / epoxy resin composite material into squares with a length of about 1cm, a width of about 1cm, and a thickness of about 4mm, and set aside;

[0045] 2) Place the glass fiber / epoxy resin composite material block in a 50mL reaction kettle, add 8mL water, 1ml acetone, 1ml methyl ether, 5mL tetrahydrofuran, 4ml acetic acid, 4.3g anhydrous zinc acetate, 2.5g anhydrous zinc chloride , 0.8g anhydrous calcium chloride, 3mL n-propanol, 5ml 30% hydrogen peroxide, 0.3g potassium nitrite, then seal the reaction kettle, heat up to 100°C, and keep warm for 6 hours (heat treatment), so that the glass fiber / epoxy The resin composite block is completely degraded, then cooled naturally to room temperature, and subjected to high-speed centrifugation to separate the carbon fiber from the reaction liquid phase product to obtain a crude g...

Embodiment 3

[0051] A method for directional bond breaking to degrade composite materials and recover fibers therefrom, comprising the steps of:

[0052] 1) Cut the carbon fiber / unsaturated polyester resin composite material into squares with a length of about 2.5cm, a width of about 1cm, and a thickness of about 8mm, and set aside;

[0053] 2) Place the carbon fiber / unsaturated polyester resin composite material block in a 50mL reaction kettle, add 6mL water, 2ml acetone, 5mL n-butanol, 3ml tetrahydrofuran, 5ml dimethyl sulfoxide, 2.8g anhydrous ferric chloride, 1.2 g anhydrous zinc chloride, 3ml disodium edetate, 2ml triethanolamine, 1ml concentrated sulfuric acid, 2ml acetic acid, 0.5g sodium thiosulfate, then seal the reaction kettle, heat up to 200°C, and keep warm for 3 hours (heating treatment) to completely degrade the carbon fiber / unsaturated polyester resin composite block, then cool naturally to room temperature, and carry out high-speed centrifugation to separate the carbon fib...

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Abstract

The invention provides a method for degradation of a composite material by directional bond breaking and recovery of fibers from the composite material. The method comprises the following steps that (1) the composite material is cut into composite material blocks with the target size for standby application; (2) the composite material blocks, solvents, metal salts, ligands, pH regulators and oxidants are mixed evenly, and then heated, the composite material blocks are naturally cooled to the room temperature after being completely degraded, and then high-speed centrifugal separation is conducted to obtain crude fiber products; and (3) the crude fiber products are washed and dried, and finally fiber fine products are obtained. According to the method, through the hot solvent effect, unsaturated complexation and weak complexation, the solvents, the metal salts, the ligands, the pH regulators, the oxidants and the composite material are mixed, and then heated, directional bond breaking degradation of resin is achieved, finally the fibers with little surface resin residue, basically no defect and the fiber strength retention rate up to 97.1% are obtained, and the degradation rate of the resin is as high as 100%.

Description

technical field [0001] The invention relates to the technical field of fiber recycling, in particular to a method for recycling fibers from fiber-reinforced thermosetting resin-based composite materials. Background technique [0002] As an important branch of composite materials, fiber-reinforced thermosetting resin-based composites have low density, high specific strength, large specific modulus, strong corrosion resistance, excellent creep resistance and fatigue resistance, and designability of materials, structures and properties. Strong, good molding process, strong structural dimensional stability and other advantages. Therefore, it is widely used in aerospace, wind power blades, transportation, sports and leisure, construction, electrical and electronic, medical equipment, pressure vessels and other fields. Moreover, its use is still expanding, and its usage is still increasing. [0003] Fiber-reinforced thermosetting resin-based composites will produce more prepreg ...

Claims

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Application Information

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IPC IPC(8): C08J11/16C08J11/28C08J11/08C08J11/26C08J11/22C08L63/00C08L61/06C08L67/06C08L75/04C08K7/14C08K7/06
CPCC08J11/16C08J11/28C08J11/08C08J11/26C08J11/22C08J2363/00C08J2361/06C08J2367/06C08J2375/04C08K7/14C08K7/06Y02W30/62
Inventor 黄志雄邓宗义郭冬云石敏先刘晓帆王大岗
Owner WUHAN UNIV OF TECH
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