A self-healing fiber-reinforced composite material and its preparation method

Abstract

The invention discloses a self-repairing fiber-reinforced composite material and a preparation method thereof. The composite material includes a fiber-reinforced composite material and a microvascular network structure arranged on the surface and / or in the middle of the fiber-reinforced composite material; The vascular network structure includes: at least one repair fluid microvessel and at least one curing agent microvessel arranged in parallel, the repair fluid microvessel and curing fluid microvessel arranged in parallel form a serpentine or geometric topology network shape; the repair fluid microvessel communicates with at least one repair fluid reservoir, and the curing agent microvessel communicates with at least one curing agent microvessel. The self-healing fiber-reinforced composite material provided by the invention is not only suitable for multiple repairs, but also can realize the effective transmission and controllable ratio of repairing agent, curing agent and catalyst, and avoid new defects after repairing.

Description

A kind of self-healing fiber reinforced composite material and preparation method thereof technical field The invention belongs to composite material technical field, particularly a kind of self-healing fiber-reinforced composite material and its manufacture. preparation method. Background technique [0002] Fiber-reinforced composite materials have important application value in the fields of aerospace, automobile, construction and electronics. close In recent years, fiber-reinforced composite materials with self-healing function have become a research hotspot, which is expected to solve the composite material caused by external force. External damage or internal damage of materials, thereby extending material life and improving application reliability. self-healing means In the case of external effects, through energy supply and material supply, it imitates the principle of biological damage healing, and can damage internal or external damage. Injury repairs itse...

AI Technical Summary

Problems solved by technology

[0003] Capsule-type self-healing materials are single-time repair materials. After the repair is completed, the same position is damaged again, and the material cannot be repaired again

Moreover, when the repair liquid in the microcapsules flows out to repair the cracks, tiny holes may be formed in the original ruptured capsules, resulting in micro-defects in the material. If the capsules are not tightly bonded to the matrix, the cracks bypass the microcapsules and expand, and there is no repair. Effect

Compared with capsule-type self-healing materials, hollow fiber-type self-healing materials are more suitable for multiple self-healing applications, but there are still the following problems: (1) The capillary action in the pipeline cannot quickly guide the flow of repair fluid or even fill the cracks ; (2) The reasonable ratio of catalyst to repair fluid cannot be guaranteed during the repair process; (3) The holes that appear after the repair liquid flows through the fiber cavity form new defects in the repaired material

However, the above-mentioned first method of mixing in proportion is difficult to control the amount and ratio of repairing agent, curing agent and catalyst flowing out at the damaged position, which affects the repairing effect; the above-mentioned second method of mixing curing agent and catalyst in the matrix , the material waste is relatively large, and there is no way to adjust when more catalysts are needed at the damaged position of the material, and the curing agent and catalyst are mixed in the matrix material, the effect of the curing agent and catalyst is prone to degradation after a long period of time, reducing or even losing the repair function

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