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Recyclable carbon fiber reinforced epoxy resin composite material, preparation method thereof and application

A technology for recycling carbon fiber and epoxy resin, which is applied in the field of polymer materials to achieve the effects of good controllability, easy implementation and simple preparation process

Active Publication Date: 2019-02-12
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] So far, there is no patent report on a simple and efficient recycling of degradable carbon fiber composite materials in the prior art

Method used

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  • Recyclable carbon fiber reinforced epoxy resin composite material, preparation method thereof and application
  • Recyclable carbon fiber reinforced epoxy resin composite material, preparation method thereof and application
  • Recyclable carbon fiber reinforced epoxy resin composite material, preparation method thereof and application

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preparation example Construction

[0040] Another aspect of the embodiments of the present invention provides a method for preparing the aforementioned recyclable carbon fiber reinforced epoxy resin composite material, which includes:

[0041] Pre-cure after uniformly mixing the aldehyde-containing monofunctional epoxy resin, curing agent, curing accelerator, epoxy reactive diluent and solvent to obtain a mixed solution, wherein the aldehyde-containing monofunctional epoxy resin and The curing agent can react to form a Schiff base structure;

[0042] Immersing the carbon fiber in the mixed solution, and then removing the solvent to obtain a carbon fiber prepreg;

[0043] The carbon fiber prepreg is subjected to heat press treatment and post-curing treatment to obtain a recyclable carbon fiber reinforced epoxy resin composite material.

[0044] As one of the preferred embodiments, the mass ratio of the aldehyde-containing monofunctional epoxy resin, curing agent, curing accelerator, epoxy reactive diluent, carb...

Embodiment 1

[0068] (1) Mix 100g of aldehyde-containing monofunctional epoxy resin 1, 80g of ethylenediamine, and 10g of ethanol and pre-cure at 50°C for 50 minutes, soak the carbon fiber unidirectional cloth in the mixed solution for 1min, and then place it in a blast oven The solvent was volatilized at 30°C for 2 hours to obtain a carbon fiber prepreg.

[0069] (2) 10 g of carbon fiber prepreg was hot-pressed at 180° C. under a pressure of 0.5 MPa for 10 minutes, and then post-cured in a vacuum oven at 180° C. for 2 hours to obtain a carbon fiber-reinforced epoxy resin composite material.

[0070] After testing, the carbon fiber reinforced epoxy resin composite material has a tensile strength of 3600MPa, a tensile modulus of 29GPa, and a glass transition temperature of 180°C, and it can be degraded in a mixed solvent of 0.1M hydrochloric acid and methanol, such as figure 1 shown. The morphology of carbon fibers before and after recycling was characterized by scanning electron microscopy...

Embodiment 2

[0072] Mix 100g of aldehyde-containing monofunctional epoxy resin 1, 90g of butanediamine, 2g of triethylamine, 3g of n-butyl glycidyl ether, and 30g of short fibers, and then cure them at 160°C for 2 hours. After curing for 2 hours, the carbon fiber composite material is obtained.

[0073] After testing, the carbon fiber reinforced epoxy resin composite material has a tensile strength of 800MPa, a tensile modulus of 16GPa, and a glass transition temperature of 140°C, and it can be degraded in a mixed solvent of 0.1M hydrochloric acid and methanol.

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Abstract

The invention discloses a recyclable carbon fiber reinforced epoxy resin composite material, a preparation method thereof, and an application. The composite material is prepared from the following components in parts by mass: 100 parts of aldehyde-based monofunctional epoxy resin, 5 to 120 parts of curing agent, 0 to 8 parts of curing accelerator, 0 to 40 parts of epoxy reactive diluent, 5 to 300parts of carbon fiber, and 0 to 400 parts of solvent. The carbon fiber is recycled by subjecting the recyclable carbon fiber reinforced epoxy resin composite material to a hydrolysis reaction under acidic conditions. The composite material obtained by the invention has excellent mechanical properties and higher glass transition temperature, and can be degraded under mild conditions to realize carbon fiber recycling.

Description

technical field [0001] The invention relates to a method for preparing a carbon fiber-reinforced composite material, in particular to a simple method for preparing a recyclable carbon fiber-reinforced epoxy resin composite material and its application, and belongs to the technical field of polymer materials. Background technique [0002] Carbon fiber reinforced composite materials have the characteristics of light weight, high strength and high heat resistance, and are widely used in aerospace, wind power generation, automobiles, civil engineering, sporting goods and other fields. Despite the many advantages of carbon fiber-reinforced composites, their widespread use creates significant economic and environmental challenges due to large amounts of waste, including unused prepreg, incisions from the manufacturing process, and end-of-life components. Therefore, the recycling of carbon fiber composite materials is very necessary. [0003] The difficulty in recycling carbon fib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08K7/06C08J5/04C08J5/24C08G59/20
CPCC08G59/20C08J5/042C08J5/24C08J2363/00C08K7/06
Inventor 马松琪王胜朱锦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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