An Online Repair Process of Thermoplastic Composite Materials

Abstract

The invention discloses an online repairing process for thermoplastic composite materials, which comprises the following steps: (1) performing surface treatment on the area to be repaired, and laying reinforcing fabrics on the area to be repaired after the treatment; (2) heating and pressing the resin powder, Then, under the action of high-pressure gas, the resin powder is sprayed onto the surface of the reinforced fabric. The resin powder particles impact the surface of the reinforced fabric, break up the fiber bundles and disperse into the fibers of the reinforced fabric, and at the same time, part of the resin powder passes through the reinforced fabric and impacts. To the area to be repaired, and enter the interior of the area to be repaired; (3) Stop spraying and then cool and solidify, so that some fibers and resin powder in the reinforcing fabric mesh with the resin matrix in the area to be repaired, and the online repair is completed after curing. The invention not only realizes the online repair of the thermoplastic composite material, but also improves the overall mechanical properties of the area to be repaired, and effectively prolongs the service life of the thermoplastic composite material.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to an online repair process of thermoplastic composite materials. Background technique [0002] Continuous fiber-reinforced thermoplastic composites are high-strength, high-rigidity, and high-toughness composites made of connecting fibers as reinforcing materials, thermoplastic resins as a matrix, and thermoplastic resins being melt-impregnated. Continuous fiber reinforced thermoplastic composites have been widely used in many fields such as automobile industry, aerospace, military industry, and electronics due to their light weight, high stiffness, and high toughness. [0003] At present, there are usually two methods for the repair of composite materials: [0004] One is to dig deep, grind, and pour glue (or hand lay-up) at the damaged (damaged) part of the composite material, but this process is mostly used in thermosetting composite material systems, not suitable fo...

AI Technical Summary

Problems solved by technology

However, the repair technology still has the following disadvantages in the application process: ① repair involves a variety of raw materials, and the operation is cumbersome; ② the conditions required for repair are relatively harsh, and repair needs to be carried out under high temperature and pressure environmental conditions, which cannot meet online repair; ③ The whole repair process is close to 10 hours, and the repair efficiency is extremely low; ④ Bismaleimide resin is a typical high-performance thermosetting resin, that is, this method is only applicable to thermosetting resins

However, this process still has the defects that the online repair temperature field is difficult to guarantee and the welding effect is poor

[0009] Therefore, for high-performance thermoplastic composite materials (melting point above 250 ° C) system, there is currently a lack of fast, efficient and feasible online repair technology

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