Impact-resistant vehicle wire harness and preparation method thereof

Abstract

The invention discloses an impact-resistant vehicle wire harness and a preparation method thereof, and relates to the technical field of wire harness materials. The preparation method of the impact-resistant vehicle wire harness comprises the following steps: wrapping the surface of the vehicle wire harness with an impact-resistant corrugated pipe to obtain the impact-resistant vehicle wire harness, the preparation method of the impact-resistant corrugated pipe comprises the following steps: according to the raw material ratio of the impact-resistant corrugated pipe, blending PA6 resin, maleic anhydride grafted POE, a composite antioxidant, a flame retardant, an organic MXene nanosheet, a lubricant, conductive carbon black and an additive, and carrying out extrusion granulation to obtain granules; and the granules are subjected to injection molding, and the impact-resistant corrugated pipe is obtained. The impact-resistant corrugated pipe prepared by the invention wraps the surface of the automotive wire harness, so that the wire harness is effectively protected from being impacted by external force, electromagnetic interference is effectively shielded, and the wire harness transmits signals normally.

Description

Technical Field

[0001] The invention relates to the technical field of wire harness materials, and in particular to an impact-resistant vehicle wire harness and a preparation method thereof. Background Art

[0002] With the rapid development of automotive electronic technology, a large number of electronic products have been used in automobiles, playing a key role in improving the fuel economy, emission performance, safety and ride comfort of automobiles. However, with the extensive application of electronic systems, the electrical power of the whole vehicle is getting larger and larger, and the number, weight and complexity of wires are rising rapidly. At the same time, the reliability of the whole vehicle electrical system is declining, which has become an important issue that needs to be solved urgently in the automotive electrical system. The automotive electronic system is an important part of the automobile. The wiring harness is the main part of the automotive electrical network and the channel for the transmission of power and electrical signals. The wiring harness consists of bundled wires, connectors, fixings and tapes. The main functions of automotive wiring harnesses include power transmission, signal transmission, etc. The wiring harness is one of the fastest-growing, most market-demanded and most conveniently installed products in the current electronic and information age. At present, with the rapid rise of the world's industry and the rapid development of the electronics industry, the status of the wiring harness industry is becoming increasingly apparent, and the demand for wiring harnesses is increasing day by day.

[0003] Among all the systems in the car, the wiring harness system is very important, through which the functions of each phase of the vehicle can be controlled. If the wiring harness connection fails or is damaged, the vehicle function and performance will be affected to a certain extent, so the line connection must be very reliable and effectively protected. The industry standard clearly stipulates that the wiring harness must be able to withstand high and low temperatures, and have strong flame retardancy and vibration resistance. When arranging the wiring harness, it must be fixed in place and protected with suitable materials. Traditional engine wiring harnesses are protected by corrugated tubes. The wiring harnesses completed by this design are low-cost and simple to manufacture. The corrugated tube is generally made of nylon (PA) and polypropylene (PP), and the corrugated structure on the surface can disperse the impact force. However, the materials used in existing corrugated tubes have the following limitations: (1) Some PA corrugated tubes tend to become brittle in environments below -40°C and may crack in extremely cold areas; (2) When continuously exposed to high temperatures of 150°C in the engine compartment, the corrugated tubes will gradually harden, resulting in a decrease in impact resistance; (3) Traditional plastic corrugated tubes cannot shield high-frequency electromagnetic interference, and high-voltage wiring harnesses in new energy vehicles require an additional metal shielding layer. Summary of the invention

[0004] The purpose of the present invention is to provide an impact-resistant automotive wiring harness and a preparation method thereof to solve the following technical problems:

[0005] Existing corrugated tubes for automotive wiring harnesses have poor high and low temperature resistance and poor high-frequency electromagnetic interference shielding performance.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A method for preparing an impact-resistant vehicle wiring harness comprises the following steps: wrapping an impact-resistant corrugated tube on the surface of the vehicle wiring harness to obtain an impact-resistant vehicle wiring harness;

[0008] The method for preparing the impact-resistant corrugated pipe comprises the following steps:

[0009] According to the raw material ratio of the impact-resistant corrugated pipe, PA6 resin, maleic anhydride grafted POE, composite antioxidant and flame retardant are blended and added to the twin-screw extruder, and then organic MXene nanosheets, lubricant and conductive carbon black are added to the twin-screw extruder, dispersed and extruded into granules, and the temperature is reduced to 170-180°C in the later stage of granulation, and additives are added through the side feeding port to obtain granules; the granules are injection molded to obtain the impact-resistant corrugated pipe.

[0010] As a further scheme of the present invention: the impact-resistant corrugated pipe includes the following raw materials in weight percentage: 60-70% PA6 resin, 12-18% maleic anhydride grafted POE, 5-10% flame retardant, 3-5% composite antioxidant, 2-5% lubricant, 1-2% conductive carbon black, 2-4% organic MXene nanosheets, 2-4% additives, and the sum of the weight percentages of the raw materials is 100%.

[0011] As a further embodiment of the present invention: the preparation method of the organic MXene nanosheets comprises the following steps:

[0012] MXene nanosheets, anhydrous ethanol, deionized water and γ-glycidyloxypropyltrimethoxysilane were added into a reaction bottle and mixed, stirred at room temperature for 18-36 hours, centrifuged, washed and dried to obtain organic MXene nanosheets.

[0013] As a further embodiment of the present invention, the addition ratio of MXene nanosheets, anhydrous ethanol, and γ-glycidyloxypropyltrimethoxysilane is 10 g: 100-200 mL: 10-40 mL: 4-8 mL.

[0014] As a further scheme of the present invention: the preparation method of the additive comprises the following steps: adding polyvinyl alcohol and deionized water into a reaction kettle and dispersing them evenly, blending terminal hydroxyl polydimethylsiloxane, γ-aminopropyltriethoxysilane, a platinum catalyst and anhydrous ethanol and adding them into the reaction kettle and dispersing them evenly, adding isophorone diisocyanate, controlling the temperature at 20-30°C, keeping the temperature for reaction for 2-4 hours, adding ethylenediamine, maintaining the pH at 8-9, controlling the temperature at 45-55°C, keeping the temperature for reaction for 2-4 hours, centrifuging, washing with water and drying to obtain the additive.

[0015] As a further embodiment of the present invention, the addition ratio of polyvinyl alcohol, deionized water, terminal hydroxyl polydimethylsiloxane, γ-aminopropyltriethoxysilane, platinum catalyst, anhydrous ethanol, isophorone diisocyanate, and ethylenediamine is 0.5-1g: 100-200mL: 10g: 3-4.5g: 0.5-0.8g: 60-100mL: 6-8g: 7-10g.

[0016] As a further solution of the present invention: the composite antioxidant is a composite of a hindered phenol antioxidant, a phosphite antioxidant and a metal passivator in a mass ratio of 10:6-8:2-3.

[0017] As a further solution of the present invention: the lubricant is a silicone lubricant; and the flame retardant is melamine polyphosphate.

[0018] As a further scheme of the present invention: the preparation method of maleic anhydride grafted POE comprises the following steps: adding POE, maleic anhydride, dicumyl peroxide and antioxidant into a twin-screw extruder, controlling the temperature at 160-200°C and the reaction time at 5-10min, extruding and granulating, soaking and washing with acetone or ethanol, removing unreacted maleic anhydride and homopolymer, and drying to obtain maleic anhydride grafted POE.

[0019] An impact-resistant automotive wiring harness is made by any one of the above-mentioned preparation methods.

[0020] Beneficial effects of the present invention:

[0021] (1) In the present application, the silanol groups formed by the hydrolysis of γ-glycidyloxypropyltrimethoxysilane in the presence of water react with the hydroxyl groups on the surface of MXene nanosheets to form a condensation reaction to form a T iOS i bond, and the MXene nanosheets are organically treated to obtain organic MXene nanosheets; the organic MXene nanosheets prepared in the present application and the conductive carbon black are simultaneously added to the raw material of the impact-resistant corrugated pipe, and a conductive network is formed through the two-dimensional layered structure, which gives the material excellent electromagnetic shielding performance, and the nano-enhancement itself effectively improves the tensile strength and puncture resistance of the material.

[0022] (2) The present application uses γ-aminopropyltriethoxysilane and terminal hydroxyl polydimethylsiloxane as raw materials, accelerates the dynamic linkage reaction under the action of a platinum catalyst, and obtains an inner core having a siloxane group; and utilizes isophorone diisocyanate and ethylenediamine chain extender to react to cause interfacial polymerization on the surface of the inner core to obtain an additive with a core-shell structure; the additive prepared in the present application is added to the raw material of the impact-resistant corrugated pipe. When cracks appear in the impact-resistant corrugated pipe, the additive breaks, and the siloxane group of the inner core undergoes an ester exchange reaction with PA6 to achieve self-repair, thereby effectively improving the sealing of the impact-resistant corrugated pipe and preventing water vapor penetration.

[0023] (3) The impact-resistant corrugated tube prepared in the present application is coated on the surface of the automotive wiring harness. The corrugated structure of the obtained corrugated tube disperses external impact forces (such as flying stones, extrusion) through deformation, thereby reducing the risk of cable wear. In addition, the corrugated tube wraps the wiring harness to avoid direct friction with the metal parts of the vehicle body, which may cause damage to the insulation layer. The impact-resistant corrugated tube of the present application not only has good temperature resistance, can withstand temperature, and adapt to the high temperature environment of the engine compartment and the low temperature environment in cold areas; it also resists corrosion from oil, water vapor, and acid-base media, thereby extending the life of the wiring harness.

[0024] (4) This application uses hindered phenol antioxidants as the main antioxidant, phosphite antioxidants as the auxiliary antioxidants, and adds metal passivators to prepare a composite antioxidant; wherein the main antioxidant is responsible for capturing free radicals, the auxiliary antioxidant is used to decompose peroxides, and the metal passivator is used to chelate copper and iron ions to prevent metal catalytic oxidation. It also works synergistically with conductive carbon black to achieve anti-oxidation and electrostatic conduction, multi-path protection, and significantly extend the service life of the bellows under extreme working conditions. DETAILED DESCRIPTION

[0025] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Embodiment 1 The preparation method of maleic anhydride grafted POE comprises the following steps:

[0027] 94 g POE (Engage 8150), 5 g maleic anhydride, 0.5 g diisopropylbenzene peroxide, and 0.5 g antioxidant (antioxidant 1010) were added into a twin-screw extruder, the temperature was controlled at 180°C, the reaction time was 5 min, granulation was performed by extrusion, acetone or ethanol soaking and washing were performed to remove unreacted maleic anhydride and homopolymer, and the mixture was dried to obtain maleic anhydride grafted POE.

[0028] The preparation method of organic MXene nanosheets comprises the following steps:

[0029] 10 g of MXene nanosheets, 100 mL of anhydrous ethanol, 20 mL of deionized water, and 4 mL of γ-glycidyloxypropyltrimethoxysilane were added into a reaction bottle and mixed, stirred at room temperature for 18 h, centrifuged, washed, and dried to obtain organic MXene nanosheets.

[0030] The preparation method of the additive comprises the following steps:

[0031] 0.5 g of polyvinyl alcohol and 100 mL of deionized water were added to the reactor and dispersed evenly. 10 g of hydroxy-terminated polydimethylsiloxane, 3 g of γ-aminopropyltriethoxysilane, and 0.5 g of platinum catalyst (H 2 PcqI 6 ), 60 mL of anhydrous ethanol and then added into the reactor, dispersed evenly, 6 g of isophorone diisocyanate was added, the temperature was controlled at 20 ° C, and the reaction was kept warm for 2 hours, 7 g of ethylenediamine was added, ammonia water was added to maintain the pH at 8, the temperature was controlled at 45 ° C, the reaction was kept warm for 2 hours, centrifuged, washed with water, and dried to obtain the additive.

[0032] Embodiment 2 The preparation method of maleic anhydride grafted POE comprises the following steps:

[0033] 94 g POE (Engage 8150), 5 g maleic anhydride, 0.5 g diisopropylbenzene peroxide, and 0.5 g antioxidant (antioxidant 1010) were added into a twin-screw extruder, the temperature was controlled at 180°C, the reaction time was 5 min, granulation was performed by extrusion, acetone or ethanol soaking and washing were performed to remove unreacted maleic anhydride and homopolymer, and the mixture was dried to obtain maleic anhydride grafted POE.

[0034] The preparation method of organic MXene nanosheets comprises the following steps:

[0035] 10 g of MXene nanosheets, 150 mL of anhydrous ethanol, 30 mL of deionized water, and 6 mL of γ-glycidyloxypropyltrimethoxysilane were added into a reaction bottle and mixed, stirred at room temperature for 24 h, centrifuged, washed, and dried to obtain organic MXene nanosheets.

[0036] The preparation method of the additive comprises the following steps:

[0037] 0.7 g of polyvinyl alcohol and 150 mL of deionized water were added to the reactor and dispersed evenly. 10 g of hydroxy-terminated polydimethylsiloxane, 4 g of γ-aminopropyltriethoxysilane, and 0.6 g of platinum catalyst (H 2 PcqI 6 ), 80 mL of anhydrous ethanol, mixed and added into the reactor, dispersed evenly, 7 g of isophorone diisocyanate was added, the temperature was controlled at 25 ° C, and the reaction was kept warm for 3 hours, 8.4 g of ethylenediamine was added, ammonia water was added to maintain the pH at 8, the temperature was controlled at 50 ° C, and the reaction was kept warm for 3 hours, centrifuged, washed with water, and dried to obtain the additive.

[0038] Example 3 The preparation method of maleic anhydride grafted POE comprises the following steps:

[0039] 94 g POE (Engage 8150), 5 g maleic anhydride, 0.5 g diisopropylbenzene peroxide, and 0.5 g antioxidant (antioxidant 1010) were added into a twin-screw extruder, the temperature was controlled at 180°C, the reaction time was 5 min, granulation was performed by extrusion, acetone or ethanol soaking and washing were performed to remove unreacted maleic anhydride and homopolymer, and the mixture was dried to obtain maleic anhydride grafted POE.

[0040] The preparation method of organic MXene nanosheets comprises the following steps:

[0041] 10 g of MXene nanosheets, 200 mL of anhydrous ethanol, 40 mL of deionized water, and 8 mL of γ-glycidyloxypropyltrimethoxysilane were added into a reaction bottle and mixed, stirred at room temperature for 36 h, centrifuged, washed, and dried to obtain organic MXene nanosheets.

[0042] The preparation method of the additive comprises the following steps:

[0043] 1 g of polyvinyl alcohol and 200 mL of deionized water were added to the reactor and dispersed evenly. 10 g of hydroxy-terminated polydimethylsiloxane, 4.5 g of γ-aminopropyltriethoxysilane, and 0.8 g of platinum catalyst (H 2 PcqI 6 ), 100mL of anhydrous ethanol and then added into the reactor, dispersed evenly, 8g of isophorone diisocyanate was added, the temperature was controlled at 30°C, and the reaction was kept warm for 2-4h, 10g of ethylenediamine was added, ammonia water was added to maintain the pH at 8, the temperature was controlled at 55°C, the reaction was kept warm for 4h, centrifuged, washed with water, and dried to obtain the additive.

[0044] Embodiment 4 A method for preparing an impact-resistant automotive wiring harness comprises the following steps:

[0045] S1: 10 g of hindered phenol antioxidant (Irganox 1076), 6 g of phosphite antioxidant (Irgafos168), and 3 g of metal passivator (Irganox MD 1024) were mixed to obtain a composite antioxidant;

[0046] S2: 63.5 g PA6 resin (purchased from Ube, Japan, 1013B), 15 g maleic anhydride grafted POE prepared in Example 1, and 4 g composite antioxidant were stirred at 80°C and 800 rpm for 10 min to obtain a mixture. The mixture and 6 g melamine polyphosphate flame retardant were then added to a twin-screw extruder. The screw temperature was: 180°C in zone 1 → 200°C in zone 2 → 220°C in zone 3, and the shear rate was 2000 s -1, -0.08MPa vacuum degassing to remove volatiles, then add 3g of the organic MXene nanosheets prepared in Example 1, 3g of silicone lubricant (POM Ultraform FK65909), and 1.5g of conductive carbon black (purchased from Sichuan Zhenghao Special Carbon Black Technology Co., Ltd., E900) into the twin-screw extruder, disperse and extrude granulate, in the later stage of granulation, the temperature is reduced to 170°C, and 4g of the additive prepared in Example 1 is added through the side feeding port to obtain granules; the granules are injection molded, the injection molding parameters are: melt temperature 240°C, injection pressure 80MPa, holding pressure / time: 40MPa / 8s, water cooling plus air cooling 15s) bellows structure: peak-to-valley ratio 1:1.2, wall thickness 1mm, to obtain an impact-resistant bellows.

[0047] S3: Wrapping an impact-resistant corrugated tube on the surface of the vehicle wiring harness to obtain an impact-resistant vehicle wiring harness.

[0048] Embodiment 5 A method for preparing an impact-resistant automotive wiring harness comprises the following steps:

[0049] S1: 10 g of hindered phenol antioxidant (Irganox 1076), 6 g of phosphite antioxidant (Irgafos168), and 3 g of metal passivator (Irganox MD 1024) were mixed to obtain a composite antioxidant;

[0050] S2: 63.5 g PA6 resin (purchased from Ube, Japan, 1013B), 15 g maleic anhydride grafted POE prepared in Example 2, and 4 g composite antioxidant were stirred at 80°C and 800 rpm for 10 min to obtain a mixture. The mixture and 6 g melamine polyphosphate flame retardant were then added to a twin-screw extruder. The screw temperature was: 180°C in zone 1 → 200°C in zone 2 → 220°C in zone 3, and the shear rate was 2000 s -1 , -0.08MPa vacuum degassing to remove volatiles, then add 3g of the organic MXene nanosheets prepared in Example 2, 3g of silicone lubricant (POM Ultraform FK65909), and 1.5g of conductive carbon black (purchased from Sichuan Zhenghao Special Carbon Black Technology Co., Ltd., E900) into the twin-screw extruder, disperse and extrude granulate, and the temperature is reduced to 170°C in the later stage of granulation, and 4g of the additive prepared in Example 2 is added through the side feeding port to obtain granules; the granules are injection molded, and the injection molding parameters are: melt temperature 240°C, injection pressure 80MPa, holding pressure / time: 40MPa / 8s, water cooling plus air cooling 15s) bellows structure: peak-to-valley ratio 1:1.2, wall thickness 1mm, to obtain an impact-resistant bellows.

[0051] S3: Wrapping an impact-resistant corrugated tube on the surface of the vehicle wiring harness to obtain an impact-resistant vehicle wiring harness.

[0052] Embodiment 6 A method for preparing an impact-resistant automotive wiring harness comprises the following steps:

[0053] S1: 10 g of hindered phenol antioxidant (Irganox 1076), 6 g of phosphite antioxidant (Irgafos168), and 3 g of metal passivator (Irganox MD 1024) were mixed to obtain a composite antioxidant;

[0054] S2: 63.5 g PA6 resin (purchased from Ube, Japan, 1013B), 15 g maleic anhydride grafted POE prepared in Example 3, and 4 g composite antioxidant were stirred at 80°C and 800 rpm for 10 min to obtain a mixture. The mixture and 6 g melamine polyphosphate flame retardant were then added to a twin-screw extruder. The screw temperature was: 180°C in zone 1 → 200°C in zone 2 → 220°C in zone 3, and the shear rate was 2000 s -1 , -0.08MPa vacuum degassing to remove volatiles, then add 3g of the organic MXene nanosheets prepared in Example 3, 3g of silicone lubricant (POM Ultraform FK65909), and 1.5g of conductive carbon black (purchased from Sichuan Zhenghao Special Carbon Black Technology Co., Ltd., E900) into the twin-screw extruder, disperse and extrude granulate, in the later stage of granulation, the temperature is reduced to 170°C, and 4g of the additive prepared in Example 3 is added through the side feeding port to obtain granules; the granules are injection molded, the injection molding parameters are: melt temperature 240°C, injection pressure 80MPa, holding pressure / time: 40MPa / 8s, water cooling plus air cooling 15s) bellows structure: peak-to-valley ratio 1:1.2, wall thickness 1mm, to obtain an impact-resistant bellows.

[0055] S3: Wrapping an impact-resistant corrugated tube on the surface of the vehicle wiring harness to obtain an impact-resistant vehicle wiring harness.

[0056] Compared with Example 5, Comparative Example 1 is that the maleic anhydride grafted POE added in Example 5 is replaced by POE (Engage 8150) in an equal amount, and the other components and preparation method are completely consistent with Example 5.

[0057] Compared with Example 5, Comparative Example 2 only replaces the organic MXene nanosheets added in Example 5 with an equal amount of MXene nanosheets, and the remaining components and preparation methods are exactly the same as those in Example 5.

[0058] Compared with Example 5, Comparative Example 3 only deletes the additives added in Example 5, and the remaining components and preparation method are completely consistent with Example 5.

[0059] Compared with Example 5, Comparative Example 4 only replaces the conductive carbon black added in Example 5 with carbon black masterbatch, and the other components and preparation method are completely consistent with Example 5.

[0060] The preparation method of the additive of Comparative Example 5 comprises the following steps:

[0061] In a nitrogen atmosphere, 10 g of polyetheramine (D2000) and 7 g of isophorone diisocyanate were added dropwise into a reaction kettle and reacted at room temperature for 3 h to obtain a polyurea prepolymer; 4 g of γ-aminopropyltriethoxysilane was added and stirred at a constant speed at room temperature for 4 h to obtain an additive.

[0062] Compared with Example 5, Comparative Example 5 only replaces the additives added in Example 5 with the additives prepared in Comparative Example 5 in equal amounts, and the remaining components and preparation method are completely consistent with those of Example 5.

[0063] Performance Testing

[0064] (1) Impact strength: According to ASTM D256 "Plastics Impact Test Method", the impact strength of the impact-resistant corrugated pipes prepared in Examples 4-6 and Comparative Examples 1-5 at -50°C was tested. The test results are shown in Table 1;

[0065] (2) Retention rate of elongation at break: According to ASTM D638 "Determination of tensile strength of plastics", the elongation at break of the impact-resistant corrugated pipes prepared in Examples 4-6 and Comparative Examples 1-5 was tested, with a gauge length of 50 mm and a tensile speed of 50 mm / min. The impact-resistant corrugated pipes prepared in Examples 4-6 and Comparative Examples 1-5 were placed in a hot air circulation aging box at 150° C.±2° C. for 1000 h, and the elongation at break of the materials was tested again. The retention rate of the elongation at break of the materials was calculated according to the following formula:

[0066] η=(ε 1 / ε 0 )×100%

[0067] Where, η-retention rate of elongation at break, %; ε 1 - Elongation at break after aging, %; ε 0 - Elongation at break before aging, %; test results are shown in Table 1;

[0068] (3) Electromagnetic shielding effectiveness: tested in the 30 MHz to 1.5 GHz frequency range according to IEEE-STD-299. The test results are shown in Table 1.

[0069] (4) Water vapor permeability: According to ASTM E96, at 85°C / 85%RH, the impact-resistant corrugated pipes prepared in Examples 4-6 and Comparative Examples 1-5 were tested. The test results are shown in Table 1;

[0070] (5) Repair rate and preservation rate: A standard crack (10 mm long and 0.5 mm deep) was cut on the surface of the impact-resistant corrugated pipe prepared in Examples 4-6 and Comparative Examples 1-5 using a blade, and a positioning point was laser-scribed to ensure that the observed area was consistent. The same site was repeated: damage → repair → re-damage → re-repair (3 cycles), and the tensile strength recovery rate was tested. The test results are shown in Table 1;

[0071] Table 1: Statistical table of performance test data of Examples 4-6 and Comparative Examples 1-4

[0072]

[0073] It can be seen from Table 1 that the impact-resistant corrugated tube prepared in the present application has good mechanical properties, and still maintains excellent mechanical properties at high temperatures of 150°C and low temperatures of -40°C; and has certain electromagnetic shielding properties and water vapor permeation resistance. The impact-resistant corrugated tube prepared in the present application is coated on the surface of the vehicle wiring harness, which not only effectively protects the vehicle wiring harness, but also improves the signal transmission stability of the wiring harness.

[0074] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for preparing an impact-resistant automotive wiring harness, characterized in that: The method comprises the following steps: wrapping an impact-resistant corrugated tube on the surface of a vehicle wiring harness to obtain an impact-resistant vehicle wiring harness; The method for preparing the impact-resistant corrugated pipe comprises the following steps: According to the raw material ratio of the impact-resistant corrugated pipe, PA6 resin, maleic anhydride grafted POE, composite antioxidant and flame retardant are blended and added to the twin-screw extruder, and then organic MXene nanosheets, lubricant and conductive carbon black are added to the twin-screw extruder, dispersed and extruded into granules, and the temperature is reduced to 170-180°C in the later stage of granulation, and additives are added through the side feeding port to obtain granules; the granules are injection molded to obtain the impact-resistant corrugated pipe.

2. The method for preparing an impact-resistant automotive wiring harness according to claim 1, characterized in that: The impact-resistant corrugated pipe comprises the following raw materials in weight percentage: 60-70% PA6 resin, 12-18% maleic anhydride grafted POE, 5-10% flame retardant, 3-5% composite antioxidant, 2-5% lubricant, 1-2% conductive carbon black, 2-4% organic MXene nanosheets, and 2-4% additives, and the sum of the weight percentages of the raw materials is 100%.

3. The method for preparing an impact-resistant automotive wiring harness according to claim 1, characterized in that: The method for preparing the organic MXene nanosheets comprises the following steps: MXene nanosheets, anhydrous ethanol, deionized water and γ-glycidyloxypropyltrimethoxysilane were added into a reaction bottle and mixed, stirred at room temperature for 18-36 hours, centrifuged, washed and dried to obtain organic MXene nanosheets.

4. The method for preparing an impact-resistant automotive wiring harness according to claim 1, characterized in that: The addition ratio of MXene nanosheets, anhydrous ethanol, deionized water, and γ-glycidyloxypropyltrimethoxysilane is 10 g: 100-200 mL: 10-40 mL: 4-8 mL.

5. The method for preparing an impact-resistant automotive wiring harness according to claim 1, characterized in that: The preparation method of the additive comprises the following steps: adding polyvinyl alcohol and deionized water into a reaction kettle and dispersing them uniformly; blending terminal hydroxyl polydimethylsiloxane, γ-aminopropyl triethoxysilane, a platinum catalyst and anhydrous ethanol and adding them into the reaction kettle and dispersing them uniformly; adding isophorone diisocyanate, controlling the temperature at 20-30°C, keeping the temperature for reaction for 2-4h; adding ethylenediamine, maintaining the pH at 8-9, controlling the temperature at 45-55°C, keeping the temperature for reaction for 2-4h, centrifuging, washing with water and drying to obtain the additive.

6. The method for preparing an impact-resistant automotive wiring harness according to claim 5, characterized in that: The addition ratio of polyvinyl alcohol, deionized water, terminal hydroxyl polydimethylsiloxane, γ-aminopropyltriethoxysilane, platinum catalyst, anhydrous ethanol, isophorone diisocyanate, and ethylenediamine is 0.5-1g: 100-200mL: 10g: 3-4.5g: 0.5-0.8g: 60-100mL: 6-8g: 7-10g.

7. The method for preparing an impact-resistant automotive wiring harness according to claim 1, characterized in that: The composite antioxidant is a composite of a hindered phenol antioxidant, a phosphite antioxidant and a metal passivator in a mass ratio of 10:6-8:2-3.

8. The method for preparing an impact-resistant automotive wiring harness according to claim 1, characterized in that: The lubricant is a silicone lubricant; and the flame retardant is melamine polyphosphate.

9. An impact-resistant vehicle wiring harness, characterized in that: Prepared by the preparation method described in any one of claims 1 to 8.

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