Self-repairing method for non-magnetic thermoplastic composite material

Abstract

The invention relates to the technical field of material self-repairing, in particular to a self-repairing method for a non-magnetic thermoplastic composite material, which comprises the following steps of: fixing a carbon fiber material at a breakage position of the non-magnetic thermoplastic composite material to obtain a fixed non-magnetic thermoplastic composite material; putting the fixed non-magnetic thermoplastic composite material into a microwave generating device, adjusting microwaves to a set value, and starting the microwave generating device; observing the non-magnetic thermoplastic composite material through an observation window of the microwave generating device, and taking out the non-magnetic thermoplastic composite material when an electric spark phenomenon occurs; and the non-magnetic thermoplastic composite material is taken out, the carbon fiber material on the surface is removed, and the repaired non-magnetic thermoplastic composite material is obtained. By adopting the steps, rapid and accurate self-repairing of the fractured non-magnetic thermoplastic composite material can be realized, and the repaired non-magnetic thermoplastic composite material is basically consistent with the non-magnetic thermoplastic composite material before damage.

Description

Technical Field

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

[0002] Thermoplastic materials refer to materials that soften when heated and harden when cooled. Due to their unique characteristics of being able to flow and deform when heated and maintain a certain shape after cooling, thermoplastic materials are widely used in many industries, covering a wide range of fields from daily necessities to high-tech products. Thermoplastic composite materials, with thermoplastic resin as the matrix and reinforcing materials as the reinforcing components, have the characteristics of low density, high strength, easy processing and reusability. They are widely used in aerospace, automobile manufacturing, construction and sporting goods. As a typical thermoplastic composite material, polyurethane has received great attention due to its adjustable hardness range, high strength, cold resistance and good processing performance.

[0003] At present, 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 of the existing studies repair them by directly heating them to make them partially melt. However, this repair method takes a long time, the repair area is difficult to be precise, 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, so as to solve the problems of slow repair of conventional non-magnetic thermoplastic composite materials and damage to other intact areas due to the non-concentrated 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: S1, fixing the carbon fiber material at the damaged and fractured part of the non-magnetic thermoplastic composite material to obtain a fixed non-magnetic thermoplastic composite material; 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; S3, observing the non-magnetic thermoplastic composite material through the observation window of the microwave generating device, 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.

[0006] Preferably, in S1, the carbon fiber material is cut according to the size of the damaged fracture of the non-magnetic thermoplastic composite material, and the size of the carbon fiber material needs to be larger than the size of the damaged fracture and the shortest is 25 mm.

[0007] Preferably, in S1, the non-magnetic thermoplastic composite material includes one or more of polyurethane, polypropylene, and nylon.

[0008] Preferably, in S2, the setting values ​​of the microwave generating device are that the microwave frequency is 2.45 GHz and the power is 3 kW.

[0009] Preferably, in S2, the non-magnetic thermoplastic composite material is fixed on the thermal insulation material of the microwave generating device.

[0010] The mechanism of the present invention is: The characteristic of continuous long carbon fibers in carbon fiber materials to generate concentrated heat in a short time during the coupling process with microwaves is utilized to melt the fractured area 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.

[0011] Therefore, the present invention adopts a self-repairing method for non-magnetic thermoplastic composite materials using the above steps, and uses carbon fiber and microwave coupling to quickly focus and heat up in a short time to repair the thermoplastic composite material. The broken non-magnetic thermoplastic composite material can be quickly and accurately self-repaired, avoiding the phenomenon that other intact areas are damaged due to the non-concentrated repair area. The performance of the repaired non-magnetic thermoplastic composite material is basically the same as before the damage.

[0012] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the interior of a microwave generating device in an embodiment of the present invention; Figure 2 It is a tensile strength diagram of the non-magnetic thermoplastic composite material before and after repair in the present invention.

[0014] Reference numerals: 1. Microwave generating device; 2. Microwave tube; 3. Thermal insulation material; 4. Non-magnetic thermoplastic composite material; 5. Carbon fiber. DETAILED DESCRIPTION

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments. Unless otherwise defined, the technical terms or scientific terms used in the present invention should be the common meanings understood by people with ordinary skills in the field to which the present invention belongs. The above-mentioned features or features mentioned in the specific examples mentioned in the present invention can be combined arbitrarily, and these specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0016] Example A self-repairing method for non-magnetic thermoplastic composite materials, comprising the following steps: S1, fixing the carbon fiber material 5 at the damaged and fractured part of the non-magnetic thermoplastic composite material 4 to obtain the fixed non-magnetic thermoplastic composite material 4; In S1, the non-magnetic thermoplastic composite material is polyurethane.

[0017] In S1, the carbon fiber material 5 is cut according to the size of the damaged fracture of the non-magnetic thermoplastic composite material 4. The size of the carbon fiber material needs to be 30 mm larger than the size of the damaged fracture, and the shortest length of the carbon fiber material is 25 mm.

[0018] S2, such as Figure 1 As shown, the fixed non-magnetic thermoplastic composite material 4 in S1 is placed into the microwave generator 1, the microwave generator 1 is adjusted to a set value, and the microwave generator 1 and the microwave tube 2 are turned on; 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.

[0019] 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 at all locations.

[0020] S3. Observe the non-magnetic thermoplastic composite material 4 through the observation window of the microwave generator 1, and take out the non-magnetic thermoplastic composite material 4 when electric sparks occur. Electric sparks occur on carbon fiber materials. Under this microwave setting condition, when the carbon fiber length is greater than 25 mm, it will discharge during the microwave coupling process, and the thermoplastic composite material can be repaired by using the carbon fiber and microwave coupling to quickly focus and heat up in a short time.

[0021] 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.

[0022] In S4, when removing carbon fiber material, just wipe it lightly with clean paper.

[0023] The tensile strength of the non-magnetic thermoplastic composite before and after repair is shown in Figure 2 As shown, there is little change in tensile strength before and after repair.

[0024] Therefore, the present invention adopts a self-repairing method for non-magnetic thermoplastic composite materials in the above steps, and uses carbon fiber and microwave coupling to quickly focus and heat up in a short time to repair thermoplastic composite materials, which can achieve rapid and accurate self-repair of broken non-magnetic thermoplastic composite materials. The performance of the repaired non-magnetic thermoplastic composite material is basically the same as before the damage.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. 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 solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution 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 part of the non-magnetic thermoplastic composite material to obtain a fixed non-magnetic thermoplastic composite material; 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; S3, observing the non-magnetic thermoplastic composite material through the observation window of the microwave generating device, 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.

2. A self-repairing method for non-magnetic thermoplastic composite materials according to claim 1, characterized in that: 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 the shortest is 25 mm.

3. A self-repairing method for non-magnetic thermoplastic composite materials according to claim 1, characterized in that: In S1, the non-magnetic thermoplastic composite material includes one or more of polyurethane, polypropylene, and nylon.

4. A self-repairing method for non-magnetic thermoplastic composite materials according to claim 1, characterized in that: In S2, the setting values ​​of the microwave generating device are that the microwave frequency is 2.45 GHz and the power is 3 kW.

5. 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.

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