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A method for recycling carbon fiber from waste carbon fiber reinforced composite materials

A reinforced composite material and carbon fiber technology, which is applied in the field of carbon fiber material recycling, can solve the problems of carbon fiber mechanical strength damage, etc., and achieve the effect of improving recovery rate, smooth carbon fiber surface and less steps

Active Publication Date: 2019-09-20
QINGHAI UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As a method of recycling carbon fiber materials, heat recovery has incomparable advantages such as low energy consumption, strong processing capacity, and high recovery rate. strength damage

Method used

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  • A method for recycling carbon fiber from waste carbon fiber reinforced composite materials
  • A method for recycling carbon fiber from waste carbon fiber reinforced composite materials
  • A method for recycling carbon fiber from waste carbon fiber reinforced composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for reclaiming carbon fibers from waste carbon fiber reinforced composite materials, comprising the steps of:

[0025] (1) Pretreatment: cutting the carbon fiber reinforced composite material into small sections of 0.2m×0.2m, soaking in absolute ethanol for 2 hours to remove surface impurities, and then drying;

[0026] (2) Heat treatment: put the carbon fiber reinforced composite material treated in step (1) on the sample processing table, and heat it with sunlight at 450°C for 90 minutes, and the obtained solid product is the recycled carbon fiber.

Embodiment 2

[0028] A method for reclaiming carbon fibers from waste carbon fiber reinforced composite materials, comprising the steps of:

[0029] (1) Pretreatment: Cut the carbon fiber reinforced composite material into small sections of 0.2m×0.25m, soak in absolute ethanol for 2.5 hours to remove surface impurities, and then dry;

[0030] (2) Heat treatment: put the carbon fiber reinforced composite material treated in step (1) on the sample processing table, and heat it with sunlight at 470°C for 95 minutes, and the obtained solid product is the recycled carbon fiber.

Embodiment 3

[0032] A method for reclaiming carbon fibers from waste carbon fiber reinforced composite materials, comprising the steps of:

[0033] (1) Pretreatment: cutting the carbon fiber reinforced composite material into small sections of 0.15m×0.15m, soaking in absolute ethanol for 1.5 hours to remove surface impurities, and then drying;

[0034] (2) Heat treatment: put the carbon fiber reinforced composite material treated in step (1) on the sample processing table, and heat it with sunlight at 420°C for 100 min, and the obtained solid product is the recycled carbon fiber.

[0035] Depend on figure 1 It can be seen that the carbon fiber reinforced composite material begins to lose weight at 344.1 °C, and the weight loss is 1.86%. When the temperature rises to 436.6°C, the mass loss is 16.80%. When the temperature continued to rise to 697.0°C, the residual mass was 75.42%. It shows that the pyrolysis temperature range of the carbon fiber reinforced composite material is 344.1-436....

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Abstract

The invention relates to recycling of carbon fiber materials, in particular to a method for recycling carbon fibers from waste carbon fiber reinforced composite materials. The method for recycling the carbon fibers from the waste carbon fiber reinforced composite materials includes pretreating the carbon fiber reinforced composite materials; carrying out heating treatment on the waste carbon fiber reinforced composite materials at the temperatures of 400-500 DEG C for 70-100 min to obtain solid products which are the recycled carbon fibers. The method has the advantages that the method includes simple processes and few steps and is low in energy consumption, the recycled carbon fibers have smooth surfaces and are excellent in performance and high in purity, and the recycling rate can be greatly increased; the method has important application and popularization value in the field of waste carbon fiber reinforced composite materials and the field of recycling of waste carbon fiber reinforced composite materials from retired aircrafts in particular.

Description

technical field [0001] The invention relates to the recycling of carbon fiber materials, in particular to a method for recycling carbon fibers from waste carbon fiber reinforced composite materials. Background technique [0002] At present, our country urgently needs to deal with the major demand of decommissioned aircraft. As of the end of 2015, there were about 20,000 commercial aircraft flying around the world, and 4,000 civil aviation aircraft in my country. Since Airbus aircraft are generally in service for 25-30 years, the above models will be scrapped and recycled gradually. It can be seen that in the next few decades, China and the world will have a continuous demand to deal with decommissioned aircraft. Carbon fiber (CF for short) is a new type of fiber material with high strength and high modulus fibers with a carbon content of more than 95%. Carbon fiber has many excellent properties. Carbon fiber has high axial strength and modulus, low density, high specific p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/00C08K7/06
Inventor 梅生伟吴磊陈晓弢薛小代司杨张韶红陈来军卢强
Owner QINGHAI UNIVERSITY