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Self-repairing fiber reinforced polymer matrix composite and preparation method thereof

A fiber-reinforced material and fiber-reinforced technology, applied in the field of self-healing fiber-reinforced polymer-based composite materials and their preparation, can solve problems such as lack of self-healing ability, achieve good bonding repair effect, facilitate mutual diffusion, The effect of high reactivity

Inactive Publication Date: 2010-01-20
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the repair system must be at a higher temperature (> 100 ℃) to play the function of self-repair, and it does not have the ability of self-repair when the temperature is lower than this

Method used

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  • Self-repairing fiber reinforced polymer matrix composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take by weighing 10g epoxy resin capsule (capsule core is glycidyl tetrahydrophthalate, capsule core content is 81%, average particle diameter 7.2 μ m) and 10g polythiol capsule (pentaerythritol tetrakis (mercapto propionate), Content 78%, benzyl dimethylamine content 6%, (average particle size 6.9μm), uniformly dispersed in 100g EPON 828 epoxy resin at 40~50℃, add 2gKH-560, 12.5g diethylenetriamine Rapid mixing and degassing. Use the above mixture to impregnate 80g of fiber reinforced material (C-glass fiber grid cloth), lay up, cure and post-cure molding. The curing and post-curing process is: room temperature 24h, 40°C 24h.

[0043] Ultrasonic scanning (T-scan) was used to test the change of the damage area of ​​the composite material after the impact of the falling hammer to evaluate the repair efficiency of the material: using two representative impact energies (1.5J, the matrix crack is the main damage form; 3.5 J, debonding of reinforcing fibers from the matrix, ...

Embodiment 2

[0045] Take by weighing 15g epoxy resin capsule (capsule core is bisphenol A diglycidyl ether, capsule core content is 93%, average particle diameter 52 μ m) and 15g polythiol capsule (pentaerythritol tetrakis (mercapto propionate), content 86% , 2,4,6-tris(dimethylaminomethyl)phenol, content 8%, average particle size 49μm)), uniformly dispersed in 100g EPON 828 epoxy resin under the condition of 40~50 ℃, add 1g KH - 570, 7g of the matrix was quickly mixed with a curing agent (2-ethyl-4-methyl-imidazole), degassed. Use the above mixture to impregnate 65g of fiber reinforced material (aramid fiber square cloth), lay up, cure and post-cure to form. Curing and post-curing process: 1h at 50°C, 1h at 80°C, 2h at 100°C.

[0046] The evaluation method is the same as in Example 1.

Embodiment 3

[0048] Take by weighing 10g epoxy resin capsules (capsule core is bisphenol A diglycidyl ether, capsule core content is 93%, average particle diameter 52 μ m) and 5g Lewis acid capsules (boron trifluoride glycerol complex, capsule core content 58 μ m) %, average particle size 12μm), uniformly dispersed in 100g EPON 828 epoxy resin at 40~50℃, add 1g KH-570, 20g matrix curing agent (adduct of tetraethylenepentamine and acrylonitrile) Rapid mixing, degassing. Use the above mixture to impregnate 40g of fiber reinforced material (E-glass fiber grid cloth), lay up, cure and post-cure to form. The curing and post-curing process is: 1h at 120°C, 1h at 160°C, and 1h at 180°C.

[0049] The evaluation method is the same as in Example 1.

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Abstract

The invention discloses a self-repairing fiber reinforced polymer matrix composite and a preparation method thereof. In the method, a double-capsule repairing system respectively containing epoxy resin prepolymer and curing agent is evenly mixed into a resin matrix, then, the matrix curing agent and catalyst are added to be evenly mixed, the obtained mixture is used for dipping fiber reinforcing material, and at last, the self-repairing fiber reinforced polymer matrix composite is obtained by solidifying and shaping. When the self-repairing composite of the invention generates cracks or fiber unsticking damage owing to heat, force, environment corrosion and the like during processing, storing and using process, cracks pass through a restorative capsule which cracks along with the matrix to release reacting substance and quickly polymerize, thus preventing crack from expanding, repairing crack damage, keeping the mechanical property of the composites and prolonging the service life thereof. The self-repairing composite prepared by the invention can automatically finish repairing cracks at the temperature of negative 50-250 DEG C, and the repairing process totally needs no artificial intervention.

Description

technical field [0001] The invention relates to a fiber-reinforced polymer-based composite material, in particular to a self-repairing fiber-reinforced polymer-based composite material and a preparation method thereof. Background technique [0002] Fiber-reinforced polymer matrix composites have many advantages such as light weight, high strength, good electrical properties and corrosion resistance, and have been widely used in aerospace, transportation, chemical, construction, machinery, microelectronics, sporting goods and other industries. However, due to processing defects, mechanical fatigue, thermal fatigue, impact, radiation, chemical degradation and other effects during processing and use, local damage and microcracks will inevitably occur inside the composite material. On the surface of the impacted composite part, although the damage is not obvious or even completely invisible, the interior of the part has produced delamination damage, which will reduce the stiffne...

Claims

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Application Information

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IPC IPC(8): C08L101/00C08L63/00C08K7/02C08L67/06C08L61/06C08L75/04C08L77/00C08L33/00C08J5/24C08J5/04
Inventor 袁彦超章明秋容敏智杨桂成覃世想
Owner SUN YAT SEN UNIV
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