High temperature self-restoring fibre enhancement epoxy composite material and preparation method thereof

A fiber-reinforced material and fiber-reinforced technology are applied in the field of high-temperature self-healing fiber-reinforced epoxy composite materials and their preparation, which can solve the problems of self-healing research lag, inability to repair micro-cracks, and poor repair effect, and achieve good self-healing. Repair performance, improved repair effect, high durability effect

Inactive Publication Date: 2008-07-09
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, ordinary fiber-reinforced epoxy composite structure repair technology cannot repair the microcracks inside the material, while the self-healing fiber-reinforced epoxy composite material based on DCPD microcapsules and Grubbs catalyst has poor repair effect, Disadvantages such as easy attenuation, not suitable for high temperature curing fiber reinforced epoxy composite materials
In fact, most of the currently widely used high-performance fiber-reinforced epoxy composites use high-temperature curing epoxy resin as the matrix, and the research on its self-healing is relatively lagging behind.

Method used

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  • High temperature self-restoring fibre enhancement epoxy composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A high-temperature self-healing fiber-reinforced epoxy composite material is prepared by the following preparation method:

[0028] (1) 5g microcapsules (the core is bisphenol A diglycidyl ether epoxy resin, the wall is polyurea aldehyde, the content of the core epoxy resin is 64% of the total weight of the microcapsules, the average particle size of the microcapsules Is 37μm) and 1g catalyst (complex of copper bromide and 2-methylimidazole) are added to 100g epoxy resin matrix (bisphenol A diglycidyl ether epoxy resin), mix well and add 19g epoxy resin The curing agent for the matrix (the adduct of tetraethylenepentamine and acrylonitrile), and then mix it evenly;

[0029] (2) Infiltrate 42.5g of fiber reinforced material (C-glass fiber checkered cloth) with the above mixture, layer, cure and post-curing to form. The curing and post-curing process are: 60℃ 2h, 80℃ 2h, 120 ℃ 2h.

[0030] For the high-temperature self-healing fiber-reinforced epoxy composite material of this...

Embodiment 4

[0032]The high-temperature self-healing fiber-reinforced epoxy composite material of Example 4 has the composition and dosage ratio shown in Table 1, and the preparation method thereof except that the microcapsule in step (1) is changed to the core of bisphenol A diglycidyl ether ring Oxygen resin, the capsule wall is a copolymer of epoxy acrylate and sodium hydroxypropane methacrylate, the epoxy resin content of the capsule core is 72% of the total weight of the microcapsules, and the average particle size of the microcapsules is 10μm; The resin matrix was changed to triglycidyl trimeric isocyanate, and the rest was the same as in Example 1.

[0033] The high-temperature self-healing fiber-reinforced epoxy composite material of Example 5 to Example 7 has the dosage ratio of each component as shown in Table 1, and the preparation method of each example is except for the curing agent for epoxy resin matrix in step (1) Change to 2-ethyl-4-methylimidazole, the curing and post-curing ...

Embodiment 8

[0034] The high-temperature self-healing fiber-reinforced epoxy composite material of Example 8, its component dosage ratio is shown in Table 1, and its preparation method except that the curing agent for epoxy resin matrix in step (1) is changed to 2-ethyl-4 -Methylimidazole, the fiber reinforced material in step (2) is changed to E-glass fiber and replaced with (45 / 0 / -45 / 90) 2s Laying method, curing and post-curing process are 80°C for 2h, 120°C for 2h, and 140°C for 2h.

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Abstract

The invention discloses a high-temperature self-repair-type fiber-reinforcement epoxy composite material and a process for preparation, the process comprises adding microcapsule and accelerating agent which are evenly mixed into the basal body of epoxide resin, adding curing agent into the basal body of epoxide resin to evenly mix, infiltrating fiber-reinforcement reinforced materials with the mixture which is got, plying, finally, curing molding and getting high-temperature self-repair-type fiber-reinforcement epoxy composite material. When cracks are produced on the high-temperature self-repair-type fiber-reinforcement epoxy composite material of the invention because of forcing in the process of processing and employing, the cracks are extended to the built-in microcapsule, and the microcapsule wall is led to crack, liquid-state epoxide resin in the microcapsule is immediately released to fill into the cracks, the accelerating agent which is built in the basal body leads the liquid-state epoxide resin to be solidified under high temperature, thereby rebinding the cracks together, and the damage of the material is repaired, thereby keeping the mechanical properties of the epoxy composite material and prolonging the life span.

Description

Technical field [0001] The invention relates to a fiber-reinforced epoxy composite material, in particular to a high-temperature self-repairing fiber-reinforced epoxy composite material and a preparation method thereof. Background technique [0002] Fiber-reinforced epoxy composite materials have many advantages such as light weight, high strength, good corrosion resistance, and good electrical properties. At present, fiber-reinforced epoxy composite materials have become one of the main structural materials of contemporary aerospace structures, and they are also chemical and transportation materials. , Construction, sports goods and other industries actively develop and apply important materials. However, on the one hand, under the current processing conditions, there are inevitably micro-cracks, impurities, micro-pores and other micro-defects in the composite material; on the other hand, the composite material is often damaged by external impact and other damage during the use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08J5/04C08K7/00C08K5/3445
Inventor 殷陶容敏智章明秋
Owner SUN YAT SEN UNIV
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