A self-repairing method for non-magnetic thermoplastic composite materials

Abstract

The present invention relates to the field of material self-repair technology, and in particular to a self-repair method for non-magnetic thermoplastic composite materials, comprising the following steps: fixing a carbon fiber material to a damaged or fractured portion of the non-magnetic thermoplastic composite material to obtain a fixed non-magnetic thermoplastic composite material; placing the fixed non-magnetic thermoplastic composite material into a microwave generator, adjusting the microwave to a set value, and turning on the microwave generator; observing the non-magnetic thermoplastic composite material through an observation window of the microwave generator, and removing the non-magnetic thermoplastic composite material when sparks occur; removing the non-magnetic thermoplastic composite material, removing the carbon fiber material from the surface, and obtaining a repaired non-magnetic thermoplastic composite material. The present invention utilizes the above steps to achieve rapid and precise self-repair of a broken non-magnetic thermoplastic composite material, with the repaired non-magnetic thermoplastic composite material being substantially the same as before the damage.

Description

Technical Field

[0001] The present invention relates to the technical field of material self-repair, and in particular to a self-repair method for non-magnetic thermoplastic composite materials. Background Art

[0002] Thermoplastic materials are materials that soften when heated and harden when cooled. Their unique ability to flow and deform when heated and retain a defined shape after cooling makes them widely used in a variety of industries, ranging from daily necessities to high-tech products. Thermoplastic composites, which use thermoplastic resins as a matrix and reinforcing materials as reinforcements, have low density, high strength, ease of processing, and reusability. They are widely used in aerospace, automotive, construction, and sporting goods. Polyurethane, a typical thermoplastic composite, has attracted significant attention due to its adjustable hardness range, high strength, cold resistance, and good processing properties.

[0003] Currently, there are many studies on the mechanical properties of thermoplastic composites, but there are few studies on the repair of such composites after damage under certain conditions. Most existing studies repair them by directly heating them to cause local melting. However, this repair method takes a long time, the repair area is difficult to accurately determine, and it is easy to cause damage to other intact areas. Summary of the Invention

[0004] The purpose of the present invention is to provide a self-repairing method for non-magnetic thermoplastic composite materials to solve the problems of slow repair of conventional non-magnetic thermoplastic composite materials and damage to other intact areas due to the non-concentration of the repair area.

[0005] To achieve the above object, the present invention provides a self-repairing method for non-magnetic thermoplastic composite materials, comprising the following steps:

[0006] S1. Fixing the carbon fiber material at the damaged and fractured portion of the non-magnetic thermoplastic composite material to obtain a fixed non-magnetic thermoplastic composite material;

[0007] S2, placing the fixed non-magnetic thermoplastic composite material in S1 into a microwave generator, adjusting the microwave generator to a set value, and turning on the microwave generator;

[0008] S3. observing the non-magnetic thermoplastic composite material through an observation window of the microwave generator, and taking out the non-magnetic thermoplastic composite material when electric sparks occur;

[0009] S4, removing the carbon fiber material on the surface of the non-magnetic thermoplastic composite material taken out in S3, to obtain a repaired non-magnetic thermoplastic composite material.

[0010] Preferably, in S1, the carbon fiber material is cut according to the size of the damaged or broken part of the non-magnetic thermoplastic composite material. The size of the carbon fiber material needs to be larger than the size of the damaged or broken part and the shortest size is 25 mm.

[0011] Preferably, in S1, the non-magnetic thermoplastic composite material includes one or more of polyurethane, polypropylene, and nylon.

[0012] Preferably, in S2, the setting values ​​of the microwave generating device are: the microwave frequency is 2.45 GHz, and the power is 3 kW.

[0013] Preferably, in S2, the non-magnetic thermoplastic composite material is fixed on the thermal insulation material of the microwave generating device.

[0014] The mechanism of the present invention is:

[0015] The characteristic of continuous long carbon fibers in carbon fiber materials generating concentrated heat in a short time during the coupling process with microwaves is utilized to melt the fractured areas of the non-magnetic thermoplastic composite material in a concentrated manner. After cooling, the cracks disappear and the non-magnetic thermoplastic composite material completes the self-repair process.

[0016] Therefore, the present invention adopts a self-repair method for non-magnetic thermoplastic composite materials using the above steps, which uses carbon fiber and microwave coupling to quickly focus and heat the thermoplastic composite material in a short time to achieve the effect of rapid and precise self-repair of the broken non-magnetic thermoplastic composite material, avoiding the phenomenon of other intact areas being damaged due to the non-concentration of the repair area. The performance of the repaired non-magnetic thermoplastic composite material is basically the same as before the damage.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the interior of a microwave generating device according to an embodiment of the present invention;

[0019] Figure 2 This is a graph showing the tensile strength of the non-magnetic thermoplastic composite material before and after repair in the present invention.

[0020] Reference numerals:

[0021] 1. Microwave generator; 2. Microwave tube; 3. Thermal insulation material; 4. Non-magnetic thermoplastic composite material; 5. Carbon fiber. DETAILED DESCRIPTION

[0022] The present invention is further described below with reference to the accompanying drawings and examples. Unless otherwise defined, technical or scientific terms used herein shall have the same meanings as those commonly understood by persons of ordinary skill in the art to which the present invention pertains. The above-mentioned features or features described in the specific examples of the present invention may be combined in any manner. These specific examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention.

[0023] Example

[0024] A self-repairing method for non-magnetic thermoplastic composite materials, comprising the following steps:

[0025] S1, fixing the carbon fiber material 5 at the damaged or broken part of the non-magnetic thermoplastic composite material 4 to obtain the fixed non-magnetic thermoplastic composite material 4;

[0026] In S1, the non-magnetic thermoplastic composite material is polyurethane.

[0027] In S1, the carbon fiber material 5 is cut according to the size of the damaged fracture portion of the non-magnetic thermoplastic composite material 4. The size of the carbon fiber material must be 30 mm larger than the size of the damaged fracture portion, and the shortest length of the carbon fiber material is 25 mm.

[0028] S2, such as Figure 1 As shown, the fixed non-magnetic thermoplastic composite material 4 in S1 is placed into the microwave generating device 1, the microwave generating device 1 is adjusted to the set value, and the microwave generating device 1 and the microwave tube 2 are turned on;

[0029] In S2, the setting values ​​of the microwave generating device 1 are that the microwave frequency provided by the microwave tube 2 is 2.45 GHz and the power is 3 kW.

[0030] In S2 , the non-magnetic thermoplastic composite material 4 is fixed on the thermal insulation material 3 of the microwave generating device 1 , and the thermal insulation material 3 keeps the temperature of the non-magnetic thermoplastic composite material 4 consistent.

[0031] S3. Observe the non-magnetic thermoplastic composite material 4 through the observation window of the microwave generator 1. Remove the non-magnetic thermoplastic composite material 4 when sparks occur. Sparks occur on carbon fiber materials. Under these microwave settings, when the carbon fiber length is greater than 25 mm, discharges occur during the microwave coupling process. The thermoplastic composite material is repaired by rapidly focusing and heating the carbon fiber and microwaves in a short period of time.

[0032] S4, removing the carbon fiber material on the surface of the non-magnetic thermoplastic composite material 4 taken out in S3, to obtain a repaired non-magnetic thermoplastic composite material 4.

[0033] In S4, when removing carbon fiber material, just wipe it gently with clean paper.

[0034] The tensile strength of the non-magnetic thermoplastic composite material before and after repair is as follows Figure 2 As shown, the tensile strength before and after repair did not change much.

[0035] Therefore, the present invention adopts a self-repair method for non-magnetic thermoplastic composite materials according to the above steps, which uses carbon fiber and microwave coupling to quickly focus and heat the thermoplastic composite materials in a short time to repair the thermoplastic composite materials. This can achieve rapid and precise self-repair of broken non-magnetic thermoplastic composite materials, and the performance of the repaired non-magnetic thermoplastic composite materials is basically the same as before the damage.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A self-repairing method for non-magnetic thermoplastic composite materials, characterized in that: The following steps are included: S1. Fixing the carbon fiber material at the damaged and fractured portion of the non-magnetic thermoplastic composite material to obtain a fixed non-magnetic thermoplastic composite material; In S1, the non-magnetic thermoplastic composite material includes one or more of polyurethane, polypropylene, and nylon; In S1, the carbon fiber material is cut according to the size of the damaged fracture of the non-magnetic thermoplastic composite material. The size of the carbon fiber material must be larger than the damaged fracture and larger than 25 mm. When the carbon fiber length is greater than 25 mm, it will discharge during the microwave coupling process, and the non-magnetic thermoplastic composite material can be repaired by using the short-term rapid focusing and heating of the carbon fiber and microwave coupling. S2, placing the fixed non-magnetic thermoplastic composite material in S1 into a microwave generator, adjusting the microwave generator to a set value, and turning on the microwave generator; In S2, the setting values ​​of the microwave generator are that the microwave frequency is 2.45 GHz and the power is 3 kW; S3. observing the non-magnetic thermoplastic composite material through an observation window of the microwave generator, and taking out the non-magnetic thermoplastic composite material when electric sparks occur; S4, removing the carbon fiber material on the surface of the non-magnetic thermoplastic composite material taken out in S3 to obtain a repaired non-magnetic thermoplastic composite material; The characteristic of continuous long carbon fibers in carbon fiber materials generating concentrated heat in a short time during the coupling process with microwaves is used to melt the fractured areas of the non-magnetic thermoplastic composite material. After cooling, the cracks disappear and the non-magnetic thermoplastic composite material completes the self-repair process.

2. The self-repairing method for non-magnetic thermoplastic composite materials according to claim 1, characterized in that: In S2, the non-magnetic thermoplastic composite material is fixed on the thermal insulation material of the microwave generating device.

Images