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Easily-recoverable carbon fiber composite material based on spiral cyclic acetal epoxy resin

A technology of cyclic acetal epoxy resin and composite materials, which is applied in the field of polymers and composite materials, can solve the problems of removal of small molecule curing shrinkage, mechanical properties, and base composite materials, and is conducive to large-scale industrial production , easy to implement, and highly operable

Active Publication Date: 2019-02-26
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The currently reported degradable thermosetting resins used for recyclable carbon fiber composites mainly include disulfide bonds, acetal structures, Schiff base structures, etc. However, these degradable groups have problems of poor stability or flexibility, resulting in the obtained The thermal stability and mechanical properties of composite materials cannot be compared with traditional thermosetting resin-based composite materials.
[0006] In recent years, IBM Corporation and South China University of Technology have obtained a class of high chemical cross-linking degree (high glass transition temperature T g and modulus) and degradable thermosetting resins can be used to prepare high-performance recyclable carbon fiber composites. However, these resins will remove small molecules when cured (large curing shrinkage), and high boiling point solvents are required (high curing temperature)

Method used

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  • Easily-recoverable carbon fiber composite material based on spiral cyclic acetal epoxy resin
  • Easily-recoverable carbon fiber composite material based on spiral cyclic acetal epoxy resin
  • Easily-recoverable carbon fiber composite material based on spiral cyclic acetal epoxy resin

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Experimental program
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Effect test

Embodiment 1

[0045] Mix and stir 100g of spiral ring acetal epoxy resin 3, 80g of methyl hexahydrophthalic anhydride, and 30g of short carbon fiber evenly, then cure at 120°C for 2 hours, at 160°C for 2 hours, and at 200°C for 2 hours to obtain Carbon fiber composite material.

[0046]The obtained carbon fiber composite material is placed in a mixed solution of 0.1M HCl water and ethanol (water:ethanol volume ratio is 2:8), and it is completely degraded in 3 hours at room temperature. the difference.

Embodiment 2

[0048] Mix 100g of spiral ring acetal epoxy resin 1, 14g of 4,4′-diaminodiphenylmethane, 30g of diglycidyl ether and 20g of short carbon fiber, and then cure at 90°C for 2 hours, and at 150°C for 2 hours hours, and cured at 180°C for 2 hours to obtain a carbon fiber composite material.

[0049] The obtained carbon fiber composite material is placed in a mixed solution of 0.1M HCl water and acetone (water:acetone volume ratio is 1:9), and it is completely degraded at room temperature for 3 hours. the difference.

Embodiment 3

[0051] Mix 100g of spiral ring acetal epoxy resin 2, 5g of polyetheramine D230 and 300g of toluene evenly, and then make a carbon fiber felt prepreg with 50g of carbon fiber felt, which is cured at 160°C for 10 hours by hot pressing, and then heated at 180°C After post-curing for 2 hours, the carbon fiber composite material is obtained.

[0052] The resulting carbon fiber composite was placed in 0.05M H 2 SO 4 In the mixed solution of water and tetrahydrofuran (volume ratio of water: tetrahydrofuran is 2:8), it will be completely degraded at room temperature for 5 hours, and the recycled carbon fiber felt can be obtained after washing, and the appearance is no different from the original carbon fiber felt.

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Abstract

The invention specifically discloses an easily-recoverable carbon fiber composite material based on spiral cyclic acetal epoxy resin, belonging to the field of polymers and composite materials. The composite material is composed of, by mass, 100 parts of spiral cyclic acetal epoxy resin, 5 to 100 parts of a curing agent, 0 to 6 parts of a curing accelerator, 0 to 30 parts of an epoxy reactive diluent, 0 to 300 parts of an organic solvent and 20 to 500 parts of carbon fibers. Compared with conventional epoxy resin / carbon fiber composite materials, the easily-recoverable carbon fiber composite material based on the spiral cyclic acetal epoxy resin can remove matrix resin bonding with carbon fibers under mild conditions, allows the carbon fibers to be well recycled and enables the recycled carbon fibers to maintain original excellent performance.

Description

technical field [0001] The invention relates to the field of polymers and composite materials, in particular to an easily recyclable carbon fiber composite material based on a helical ring acetal epoxy resin. Background technique [0002] Carbon fiber reinforced polymer composite materials have the advantages of light weight, high modulus and high strength, and are widely used in aerospace, wind power generation, lightweight vehicles, sports equipment and other fields. In the future, China's four major industries - large aircraft projects, offshore wind power generation, automobile lightweight development and high-speed railways will undoubtedly drive strong growth in demand for carbon fiber. 25 years, and 10-15 years for auto parts. After the life of these products ends, their recycling will become a very important issue. [0003] Carbon fiber composite recycling methods can be divided into four types: landfill, incineration, crushing, and separation. Although landfill is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08K7/06C08K7/00C08G59/26
CPCC08G59/26C08K7/00C08K7/06C08L63/00B29B17/02B29B2017/0293B29K2105/08B29K2307/04
Inventor 马松琪朱锦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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