Method for one-step recovery and modification of carbon fiber

A carbon fiber and modification technology, which is applied in the field of one-step recovery and modification of carbon fiber, can solve the problems of limited promotion and application, high price of carbon fiber, etc., and achieve the effect of broadening the application range, simple reaction steps, and excellent mechanical properties

Inactive Publication Date: 2012-07-11
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high price of carbon fiber greatly ...

Method used

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  • Method for one-step recovery and modification of carbon fiber
  • Method for one-step recovery and modification of carbon fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Embodiment 1: With the recovered epoxy resin carbon fiber composite material as the initial raw material, it is broken into small pieces with length × width × thickness equal to 10 × 4 × 3cm by a hammer crusher; water is used as the liquefaction solution and sodium carbonate as the The catalyst decomposes the recycled epoxy resin carbon fiber composite material by hydrothermal method, and finally obtains the recycled carbon fiber with excellent mechanical properties and active groups such as -COOH and -OH on the surface.

[0016] Step (1): Break the recovered epoxy resin carbon fiber composite material into small pieces with length × width × thickness equal to 10 × 4 × 3cm through a hammer crusher; then crush the epoxy resin carbon fiber composite material in small pieces Dry at 100°C for 1 hour;

[0017] Step (2): Add 800mL of water and 8g of sodium carbonate in the autoclave, stir with a glass rod for 15 minutes, then add 200g of dried epoxy resin carbon fiber composi...

Embodiment 2

[0020] Example 2: Using the recovered unsaturated resin carbon fiber composite material as the initial raw material, it is broken into small pieces with length × width × thickness equal to 10 × 4 × 3cm by a hammer crusher; water is used as the liquefaction solution and sulfuric acid as the catalyst The recycled unsaturated resin carbon fiber composite material is hydrothermally decomposed, and finally the recycled carbon fiber with excellent mechanical properties and active groups such as -COOH and -OH attached to the surface is obtained.

[0021] Step (1): Break the recovered unsaturated resin carbon fiber composite material into small pieces with length × width × thickness equal to 10 × 4 × 3cm through a hammer crusher; then crush the unsaturated resin carbon fiber composite material in small pieces Dry at 80°C for 2 hours;

[0022] Step (2): Add 800mL of water and 8mL, 90% weight concentration of sulfuric acid solution in the autoclave, stir with a glass rod for 10 minutes,...

Embodiment 3

[0024] Embodiment 3: With the reclaimed phenolic resin carbon fiber composite material as the initial raw material, it is broken into small pieces with length × width × thickness equal to 10 × 4 × 3cm by a hammer crusher; with absolute ethanol as the liquefaction solution and sulfuric acid as The catalyst decomposes the recovered phenolic resin carbon fiber composite material by hydrothermal method, and finally obtains the recovered carbon fiber with excellent mechanical properties and active groups such as -COOH and -OH attached to the surface.

[0025] Step (1): Break the recovered phenolic resin carbon fiber composite material into small pieces equal to 10×4×3cm in length×width×thickness through a hammer crusher; Dry for 2 hours;

[0026] Step (2): Add 900mL of absolute ethanol and 9mL, 90% weight concentration sulfuric acid solution in the autoclave, stir with a glass rod for 10 minutes, then add 300g of dried phenolic resin carbon fiber composite material small pieces, A...

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Abstract

The invention belongs to the technical field of comprehensive utilization of solid waste, and particularly relates to a method for one-step recovery and modification of carbon fiber. A polymer carbon fiber composite material is crushed mechanically into an appropriate size, the crushed polymer carbon fiber composite material, solvents and catalysts are added into a high-pressure reactor, the polymer matrix of the polymer carbon fiber composite material is decomposed with water at center temperature and under certain pressure, and finally the recycled carbon fiber with excellent mechanical properties and with the surface connected with -COOH, -OH and other active groups is prepared. The reaction steps are simple, the polymer matrix of the polymer carbon fiber composite material can be fully decomposed by the water at certain temperature and under certain pressure, and the surface of the carbon fiber is connected with the -COOH, -OH and other active groups while the internal structure of the carbon fiber is not destroyed. The recycled carbon fiber has excellent mechanical properties and can be used again as a reinforcing material for the composite material. Therefore, the pressure of waste disposal can be reduced, the material cost can be decreased, and the method has great economic and social significance.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste, and in particular relates to a method for recovering and modifying carbon fibers in one step. Background technique [0002] Carbon fiber is a new material with excellent mechanical properties. Its specific gravity is less than 1 / 4 of that of steel. The tensile strength of carbon fiber resin composite materials is generally above 3500Mpa, which is 7 to 9 times that of steel. The tensile modulus of elasticity is 23000 ~43000Mpa is also higher than steel. However, the high price of carbon fiber greatly limits its promotion and application in various fields. [0003] Water is the most important solvent in nature. The critical temperature and pressure of water are 647.3K and 22.1 MPa, respectively. Supercritical water refers to water whose temperature and pressure are above the critical point. Compressed liquid water with a temperature between 200 and 350°C is calle...

Claims

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Application Information

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IPC IPC(8): C08J11/14C08K9/02C08K9/04C08K7/06
CPCY02W30/62
Inventor 邱军李启胜
Owner TONGJI UNIV
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