Anti-aging wire harness for automobile motor and preparation method thereof

Abstract

The application discloses an anti-aging wire harness for automobile motors and a preparation method thereof, and relates to the technical field of wire harnesses. The preparation of the anti-aging wire harness for automobile motors comprises the following steps: step 1: after preheating a conductive wire core, a temperature-resistant insulating material is extruded on the conductive wire core by using an extruder, and after cooling, a temperature-resistant insulating layer is formed, thereby obtaining a basic wire harness; step 2: the basic wire harness is fully coated with aluminum foil to form an aluminum foil shielding layer, thereby obtaining an intermediate wire harness; and step 3: after preheating the intermediate wire harness, a flame-retardant anti-aging material is extruded on the intermediate wire harness by using an extruder, and after cooling, a flame-retardant anti-aging layer is formed, thereby obtaining the anti-aging wire harness for automobile motors. The anti-aging wire harness for automobile motors is obtained by coating a conductive wire core with a temperature-resistant insulating layer, an aluminum foil shielding layer and a flame-retardant anti-aging layer in sequence, has excellent anti-aging performance and safety performance, can adapt to more severe working environments, and can greatly guarantee the normal operation of automobile internal systems.

Description

Technical Field

[0001] This invention relates to the field of wiring harness technology, specifically to an anti-aging wiring harness for automotive motors and its preparation method. Background Technology

[0002] As a core component of modern automotive powertrain and auxiliary systems, the stability and reliability of automotive motors are of paramount importance. Their internal wiring harnesses, acting as the "neural network" connecting the motor to the vehicle's electrical system, play a crucial role in transmitting power and control signals. However, automotive motors typically operate in extremely harsh environments, especially the wiring harnesses in the engine compartment or near the power unit, which face severe challenges from multiple aging factors (such as high-temperature aging, ultraviolet radiation aging, oxidation aging, oil corrosion aging, and moisture aging). If these internal wiring harnesses age, it will inevitably affect the normal operation of the motor, posing a potential threat to vehicle safety and even the life safety of the driver.

[0003] Therefore, there is an urgent need to develop an anti-aging wiring harness for automotive motors, which is of great significance. Summary of the Invention

[0004] The purpose of this invention is to provide an anti-aging wiring harness for automotive motors and its preparation method, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A method for preparing an anti-aging wire harness for automotive motors includes the following steps:

[0007] Step 1: After preheating the conductive core to 50~80℃, use an extruder to extrude the heat-resistant insulating material onto the conductive core. After cooling, a tightly wrapped heat-resistant insulating layer is formed, resulting in the basic wire harness.

[0008] Step 2: Use aluminum foil to fully cover the basic wire harness to form an aluminum foil shielding layer, thus obtaining the intermediate wire harness;

[0009] Step 3: After preheating the intermediate wire harness to 50~80℃, use an extruder to extrude the flame-retardant and anti-aging material onto the intermediate wire harness. After cooling, a tightly wrapped flame-retardant and anti-aging layer is formed, resulting in an anti-aging wire harness for automotive motors.

[0010] Furthermore, the cross-sectional area of ​​the conductive wire core is 0.35~1mm². 2 .

[0011] Furthermore, the thickness of the heat-resistant insulating layer is 0.5~1mm.

[0012] Furthermore, the thickness of the aluminum foil shielding layer is 0.01~0.03mm.

[0013] Furthermore, the thickness of the flame-retardant and anti-aging layer is 1 mm.

[0014] Furthermore, the heat-resistant insulating material comprises the following raw material components: by weight, 34-40 parts of polyvinyl chloride, 18-22 parts of polystyrene, 8-12 parts of maleic anhydride-grafted polystyrene, 2-4 parts of composite heat stabilizer I, 8-16 parts of composite filler, 2-4 parts of toughening agent, and 0.5-1.5 parts of lubricant.

[0015] Furthermore, the preparation method of the heat-resistant insulating material is as follows: the raw material components of the heat-resistant insulating material are added into the extruder according to the formula ratio, the screw speed is controlled at 80~100 r / min, and the mixture is melt-blended at 160~180℃ for 20~30 min, and then extruded to obtain the heat-resistant insulating material.

[0016] Furthermore, the flame-retardant and anti-aging material comprises the following raw material components: by weight, 34-40 parts of polyvinyl chloride, 18-22 parts of polystyrene, 8-12 parts of maleic anhydride-grafted polystyrene, 2-4 parts of composite heat stabilizer II, 8-16 parts of composite filler, 2-4 parts of toughening agent, and 0.5-1.5 parts of lubricant.

[0017] Furthermore, the preparation method of the flame-retardant and anti-aging material is as follows: the raw material components of the flame-retardant and anti-aging material are added into the extruder according to the formula ratio, the screw speed is controlled at 80~100r / min, and the mixture is melt-blended at 160~180℃ for 20~30min, and then extruded to obtain the flame-retardant and anti-aging material.

[0018] Furthermore, the preparation method of the maleic anhydride-grafted polystyrene is as follows: polystyrene, maleic anhydride, and dicumyl peroxide are mixed evenly and then added into an extruder. The screw speed is controlled at 30~50 r / min, and the mixture is melt-blended at 160~200℃ and extruded to obtain maleic anhydride-grafted polystyrene.

[0019] Furthermore, the mass ratio of polystyrene, maleic anhydride, and dicumyl peroxide is 1:(0.02~0.05):(0.004~0.01).

[0020] Furthermore, the composite heat stabilizer I is obtained by mixing a primary heat stabilizer and an auxiliary heat stabilizer in a mass ratio of (3~5):1.

[0021] Furthermore, the composite heat stabilizer II is obtained by mixing the main heat stabilizer and the auxiliary heat stabilizer at a mass ratio of 1:(3~5).

[0022] Furthermore, the primary heat stabilizer is a metal soap-based heat stabilizer, specifically including but not limited to one or more combinations of lead stearate, barium stearate, calcium stearate, zinc stearate, magnesium stearate, barium ricinoleate, cadmium ricinoleate, and calcium ricinoleate.

[0023] Furthermore, in this embodiment of the invention, the main heat stabilizer is obtained by mixing zinc stearate and calcium stearate in a mass ratio of 1:1.

[0024] Further, the preparation method of the auxiliary heat stabilizer is as follows: (1) Diethanolamine is added to the reaction vessel, stirred and heated to 65~75℃, and then a quantitative amount of paraformaldehyde is added to it every 15 min, for a total of four times. After the addition is completed, stirring and heating are continued to 75~85℃ for 2~4 h; finally, a methanol solution of 2,2'-4,4'-tetrahydroxybenzophenone is added to the reaction system, and the reaction is kept at a constant temperature for 2~4 h. The reaction is then stopped, and the mixture is allowed to cool naturally to room temperature. (2) Under nitrogen protection, 3-mercaptopropionic acid and the diethanolamine-grafted 2,2'-4,4'-tetrahydroxybenzophenone derivative were added to acetone and stirred until homogeneous. Then, 1,3-dicyclohexylcarbodiimide and 4-dimethylaminopyridine were added and stirred for 24-36 h. The reaction was then stopped and purified to obtain 3-mercaptopropionic acid-grafted 2,2'-4,4'-tetrahydroxybenzophenone derivative. (3) 3-mercaptopropionic acid grafted with 2,2'-4,4'-tetrahydroxybenzophenone derivative, styrene-maleic anhydride copolymer, and photoinitiator were added to acetone, stirred and mixed evenly, and then treated with 365nm ultraviolet light for 1-2 hours under stirring. The reaction was ended and purified to obtain styrene-maleic anhydride copolymer grafted with 2,2'-4,4'-tetrahydroxybenzophenone derivative; (4) styrene-maleic anhydride copolymer grafted with 2,2'-4,4'-tetrahydroxybenzophenone derivative was added to acetone, stirred and mixed evenly, and then 5wt% sodium hydroxide aqueous solution was added to adjust the pH to 6.5-7 to obtain reaction solution A; lanthanum nitrate was added to acetone, stirred and mixed evenly to obtain reaction solution B; under stirring, reaction solution B was slowly added dropwise to reaction solution A. After the addition was completed, the reaction was stirred for 2-4 hours. Finally, it was allowed to stand at room temperature for 12 hours and purified to obtain auxiliary heat stabilizer.

[0025] Furthermore, the mass ratio of diethanolamine, paraformaldehyde, and 2,2'-4,4'-tetrahydroxybenzophenone is (2~2.5):(0.15~0.2):1.

[0026] Further, the mass ratio of 3-mercaptopropionic acid, diethanolamine-grafted 2,2'-4,4'-tetrahydroxybenzophenone derivative, 1,3-dicyclohexylcarbodiimide, and 4-dimethylaminopyridine is (1.1~1.3):1:(0.15~0.25):(0.015~0.025).

[0027] Furthermore, the mass ratio of the 3-mercaptopropionic acid grafted with the 2,2'-4,4'-tetrahydroxybenzophenone derivative, the styrene-maleic anhydride copolymer, and the photoinitiator is (0.4~0.6):1:(0.05~0.1).

[0028] Furthermore, the styrene-maleic anhydride copolymer grafted with 2,2'-4,4'-tetrahydroxybenzophenone derivative and lanthanum nitrate has a mass ratio of 1:(0.1~0.2).

[0029] Further, the composite filler is obtained by uniformly mixing calcium carbonate and aluminum nitride at a mass ratio of 5:(1~3), and then modifying it with modified aminoethylaminopropyltriethoxysilane. The specific method is as follows: (1) Add DOPO and triethylamine to anhydrous ethanol, stir and mix evenly, then add carbon tetrachloride dropwise. After the addition is complete, react at -20~20℃ for 2~4h; (2) Add aminoethylaminopropyltriethoxysilane to (1), and react at 40~60℃ for 24~36h. The reaction was separated and purified to obtain modified aminoethylaminopropyltriethoxysilane; (3) the modified aminoethylaminopropyltriethoxysilane was added to a 95wt% aqueous ethanol solution and acetic acid was added to adjust the pH to 4.5~5.5. The mixture was stirred and mixed for 25~35min to prepare a silane hydrolysate with a concentration of 2~5wt%; (2) the uniformly mixed calcium carbonate and aluminum nitride were immersed in the silane hydrolysate, stirred slightly, and after 10~20min, it was taken out and dried to obtain the composite filler.

[0030] Furthermore, the mass ratio of DOPO, triethylamine, carbon tetrachloride, and aminoethylaminopropyltriethoxysilane is (0.7~0.8):1:1:1.

[0031] Furthermore, the toughening agent is a methyl methacrylate-butadiene-styrene terpolymer.

[0032] Furthermore, the extrusion parameters are: melt temperature of 160~180℃, screw speed of 80~100r / min, and extrusion speed of 300~500m / min.

[0033] Furthermore, the anti-aging wire harness for automotive motors prepared by the aforementioned method comprises, in sequence, a conductive wire core, a heat-resistant insulation layer wrapped around the conductive wire core, an aluminum foil shielding layer wrapped around the heat-resistant insulation layer, and a flame-retardant and anti-aging layer wrapped around the aluminum foil shielding layer.

[0034] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0035] (1) In this invention, a high-performance anti-aging wire harness for automotive motors is prepared by sequentially wrapping a heat-resistant insulation layer, an aluminum foil shielding layer, and a flame-retardant and anti-aging layer onto the conductive wire core. The heat-resistant insulation layer serves two purposes: 1) to conduct heat and prevent thermal degradation of the polyvinyl chloride inside the wire harness; and 2) to provide insulation and improve the safety performance of the wire harness. In summary, the heat-resistant insulation layer provides a solid foundation for the heat aging resistance and safety of the anti-aging wire harness for automotive motors. The aluminum foil shielding layer serves to tightly wrap the basic wire harness, shielding it from high-frequency electromagnetic waves and blocking interference signals. Without the aluminum foil shielding layer, the wire harness will be subject to electromagnetic interference, which will cause signal corruption in the equipment and generate induced voltage. The long-term accumulation of induced voltage will also cause the wire harness to age or even break down. In summary, the aluminum foil shielding layer can greatly reduce the safety hazards of the wire harness and also provides a certain guarantee for the anti-aging performance of the wire harness. The flame-retardant and anti-aging layer serves to provide final protection for the wire harness, and it has stronger anti-aging and safety performance.

[0036] (2) In order to enhance the heat resistance of polyvinyl chloride (PVC), polystyrene with a higher glass transition temperature was added to improve it. However, PVC and polystyrene have different polarities, making it difficult to achieve full fusion. Based on this, maleic anhydride-grafted polystyrene was prepared by melt grafting as a compatibility enhancer in this invention. On the one hand, it can promote the compatibility of PVC and polystyrene. On the other hand, maleic anhydride-grafted polystyrene can also enhance the heat resistance of PVC to a certain extent. The amount of dicumyl peroxide needs to be controlled. If it is too little, the grafting rate will be too low, and the interfacial compatibility between PVC and polystyrene will not be effectively improved. If it is too much, the polystyrene in the extruder will break down, resulting in waste. On the other hand, even if grafting is successful, if the grafting amount is too much, it is easy to graft onto two polymer chains, resulting in a cross-linked network in the prepared product, which will affect the melting performance of the raw material components of the subsequent heat-resistant insulating material and thus affect the compatibility of the raw material components. In addition, the present invention further incorporates methyl methacrylate-butadiene-styrene terpolymer as a toughening agent, which has good compatibility with polyvinyl chloride. On the one hand, it can improve the heat resistance of polyvinyl chloride, and on the other hand, it can synergistically promote compatibility with maleic anhydride-grafted polystyrene.

[0037] (3) Since polyvinyl chloride resin has poor thermal stability, the scheme is designed to add metal soap heat stabilizers to improve the thermal stability of polyvinyl chloride. Metal soap heat stabilizers are generally used in combination with other types of heat stabilizers to achieve the effect of enhancing the thermal stability of polyvinyl chloride in a comprehensive and synergistic way. Based on this, the present invention first involves nucleophilic addition of formaldehyde obtained by depolymerization of diethanolamine and paraformaldehyde, followed by activation by heating to dehydrate it into a more reactive imine ion. This imine ion then undergoes nucleophilic substitution with the less sterically hindered hydrogen at position 3 on the benzene ring of 2,2'-4,4'-tetrahydroxybenzophenone, yielding a diethanolamine-grafted 2,2'-4,4'-tetrahydroxybenzophenone derivative. Next, it undergoes esterification with 3-mercaptopropionic acid to obtain a 3-mercaptopropionic acid-grafted 2,2'-4,4'-tetrahydroxybenzophenone derivative containing a mercapto group. Then, it undergoes a click reaction with a styrene-maleic anhydride copolymer to obtain a styrene-maleic anhydride copolymer-grafted 2,2'-4,4'-tetrahydroxybenzophenone derivative. Finally, it is coordinated with a lanthanum ion to ultimately obtain a rare-earth-based auxiliary heat stabilizer containing a benzophenone structure. This auxiliary heat stabilizer exhibits good compatibility with polyvinyl chloride (PVC) and can be uniformly dispersed within it. On one hand, it synergistically enhances PVC's resistance to heat aging with metal soap-based heat stabilizers. On the other hand, both rare earth elements and the benzophenone structure possess the ability to absorb ultraviolet light, thus imparting excellent UV aging resistance to PVC. Furthermore, considering cost factors and the fact that the inner heat-resistant insulation layer will not be in direct contact with light, the amount of auxiliary heat stabilizer in the heat-resistant insulation layer material is less than that in the flame-retardant insulation layer. Finally, rare earth elements can promote charring, which also contributes to flame-retardant properties.

[0038] (4) Calcium carbonate is a material with excellent insulation properties. Adding it to polyvinyl chloride (PVC) can significantly improve the insulation of PVC resin. However, its thermal conductivity is relatively low. If only calcium carbonate is added, the heat transfer from the inside of the wire harness to the outside will be slow in practical applications, resulting in a higher internal temperature. At such a high temperature, PVC will decompose. Therefore, in order to improve the heat aging resistance of PVC, aluminum nitride is designed to be added in this invention. Aluminum nitride is a material with excellent thermal conductivity and insulation properties. When combined with calcium carbonate, it can enhance both the insulation properties and the heat aging resistance of PVC. Based on this, the two are mixed and modified in a certain mass ratio in this invention to obtain an anti-aging wire harness for automotive motors with excellent insulation and heat aging resistance at a lower cost. In addition, in order to further enhance the heat aging resistance and safety performance of the wire harness, DOPO is used to graft and modify aminoethylaminopropyltriethoxysilane to obtain modified aminoethylaminopropyltriethoxysilane, which is then used to modify the mixed filler of calcium carbonate and aluminum nitride. The resulting composite filler not only ensures excellent insulation of the wire harness, but also enhances its flame retardancy due to the presence of the DOPO structure, thereby improving its resistance to thermal aging. Furthermore, the composite filler can absorb ultraviolet light, which also helps to protect the wire harness from UV aging to some extent.

[0039] In summary, this invention has comprehensively prepared an anti-aging wiring harness for automotive motors with excellent anti-aging and safety performance. It can adapt to more severe working environments, thereby greatly ensuring the normal operation of automotive internal systems, which is of great significance. Detailed Implementation

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that the following quantities are by weight, and there are no special restrictions on the suppliers of all raw materials involved in this invention. Exemplary examples include:

[0042] In the following examples, polyvinyl chloride (PVC) with a purity of 99% (item number 9002-86-2), polystyrene with a purity of 99% (item number 9003-55-8), styrene-maleic anhydride copolymer with a purity of 99% (item number 31959-78-1), 3-mercaptopropionic acid with a purity of 99%, calcium stearate with a purity of 99%, zinc stearate with a purity of 99%, photoinitiator-184 with a purity of 99%, carbon tetrachloride with a purity of 99%, triethylamine with a purity of 99%, and aminoethylaminopropyltriethoxysilane with a purity of 99% were all purchased from Hubei Yongkuo Technology Co., Ltd.

[0043] Diethanolamine, with a purity of 99%, and paraformaldehyde, with a purity of 99%, both with product number 30525-89-4, were purchased from Jiangsu Chuangteng New Material Technology Co., Ltd.

[0044] 2,2'-4,4'-Tetrahydroxybenzophenone, with a purity of 98%, was purchased from Hebei Zhentian Food Additives Co., Ltd.

[0045] Calcium carbonate, with a purity of 99% and an average particle size of 50 nm, and aluminum nitride, with a purity of 99% and an average particle size of 50 nm, were both purchased from Shanghai Xiaohuang Nanotechnology Co., Ltd.

[0046] Lanthanum nitrate, 99% pure, catalog number MKR5, purchased from McRay Rare Earth Co., Ltd.

[0047] Methyl methacrylate-butadiene-styrene terpolymer, product number EM500, was purchased from Dongguan Zhangmutou Ningtao Plastic Raw Materials Co., Ltd.

[0048] The lubricant, model Plastistrength® L1000, was purchased from Dongguan Bailing New Materials Co., Ltd.; the rest were purchased commercially.

[0049] Preparatory step 1: Preparation of maleic anhydride-grafted polystyrene: Preparation of maleic anhydride-grafted polystyrene: Polystyrene, maleic anhydride, and dicumyl peroxide are mixed evenly in a mass ratio of 1:0.035:0.007, and then added to an extruder. The screw speed is controlled at 40 r / min, and the mixture is melt-blended at 190℃ and extruded to obtain maleic anhydride-grafted polystyrene.

[0050] Preparation 2: Preparation of the main heat stabilizer: Mix zinc stearate and calcium stearate in a mass ratio of 1:1 to obtain the main heat stabilizer.

[0051] Preparatory step 3: Preparation of auxiliary heat stabilizer: (1) Add 18.4 parts of diethanolamine to the reaction vessel, stir and heat to 60°C, then add a quantitative amount of paraformaldehyde (1.44 parts in total) every 15 min, for a total of four additions. After the addition is completed, continue stirring and heating to 80°C for 3 h. Finally, add a 30 wt% methanol solution of 2,2'-4,4'-tetrahydroxybenzophenone (prepared from 8 parts of 2,2'-4,4'-tetrahydroxybenzophenone) to the reaction system, keep the temperature for 3 h, and end the reaction. The reaction was allowed to cool naturally to room temperature, and after separation and purification, a diethanolamine-grafted 2,2'-4,4'-tetrahydroxybenzophenone derivative was obtained; (2) Under nitrogen protection, 9.6 parts of 3-mercaptopropionic acid and 8 parts of diethanolamine-grafted 2,2'-4,4'-tetrahydroxybenzophenone derivative were added to 50 parts of acetone, stirred and mixed evenly, and then 1.6 parts of 1,3-dicyclohexylcarbodiimide and 0.16 parts of 4-dimethylaminopyridine were added, and the reaction was stirred for 30 h. The reaction was then stopped, and after separation and purification, a 3-mercaptopropionic acid-grafted 2,2'-4,4'-tetrahydroxybenzophenone derivative was obtained. 2,2'-4,4'-Tetrahydroxybenzophenone derivative; (3) 8 parts of 3-mercaptopropionic acid grafted 2,2'-4,4'-tetrahydroxybenzophenone derivative, 16 parts of styrene-maleic anhydride copolymer, and 1.2 parts of photoinitiator-184 were added to 50 parts of acetone, stirred and mixed evenly, and then treated with 365nm ultraviolet light for 1.5h under stirring to end the reaction. After separation and purification, styrene-maleic anhydride copolymer grafted 2,2'-4,4'-tetrahydroxybenzophenone derivative was obtained; (4) 8 parts of 3-mercaptopropionic acid grafted 2,2'-4,4'-tetrahydroxybenzophenone derivative were added to 50 parts of acetone, stirred and mixed evenly, and then treated with 365nm ultraviolet light for 1.5h under stirring to end the reaction. After separation and purification, styrene-maleic anhydride copolymer grafted 2,2'-4,4'-tetrahydroxybenzophenone derivative was obtained; A styrene-maleic anhydride copolymer grafted with a 2,2'-4,4'-tetrahydroxybenzophenone derivative was added to 25 parts of acetone and stirred until homogeneous. Then, 5 wt% sodium hydroxide aqueous solution was added to adjust the pH to 6.8 ± 0.1 to obtain reaction solution A. 1.2 parts of lanthanum nitrate were added to 10 parts of acetone and stirred until homogeneous to obtain reaction solution B. While stirring, reaction solution B was slowly added dropwise to reaction solution A. After the addition was complete, the reaction was stirred for 3 hours. Finally, the mixture was allowed to stand at room temperature for 12 hours and then purified to obtain the auxiliary heat stabilizer.

[0052] Example 1: A method for preparing an anti-aging wire harness for automotive motors:

[0053] Step 1: Prepare the composite heat stabilizer:

[0054] S11: Composite heat stabilizer I: The main heat stabilizer and the radiation heat stabilizer are mixed at a mass ratio of 4:1 to obtain composite heat stabilizer I;

[0055] S12: Composite Heat Stabilizer II: The main heat stabilizer and the radiation heat stabilizer are mixed at a mass ratio of 1:4 to obtain Composite Heat Stabilizer II;

[0056] Step 2: Preparation of composite filler: (1) Add DOPO and triethylamine to an appropriate amount of anhydrous ethanol, stir and mix evenly, then add carbon tetrachloride dropwise, and after the addition is complete, react at 0℃ for 3h; (2) Add aminoethylaminopropyltriethoxysilane to (1), react at 50℃ for 30h, end the reaction, and obtain modified aminoethylaminopropyltriethoxysilane after separation and purification; (3) Add modified aminoethylaminopropyltriethoxysilane to 95wt% ethanol aqueous solution, and add acetic acid to adjust the pH to 5, stir and mix for 30min, and prepare a silane hydrolysate with a concentration of 5wt%; (2) Mix calcium carbonate and aluminum nitride evenly at a mass ratio of 5:2, immerse in silane hydrolysate, stir slightly, wait 15min, take out, dry, and obtain composite filler;

[0057] The mass ratio of DOPO, triethylamine, carbon tetrachloride, and aminoethylaminopropyltriethoxysilane is 0.75:1:1:1.

[0058] Step 3: Preparation of temperature-resistant insulating materials and flame-retardant and anti-aging materials:

[0059] S31: Heat-resistant insulating material: Add each raw material component of the heat-resistant insulating material into the extruder according to the formula ratio, control the screw speed at 100r / min, melt and blend at 170℃ for 30min, and extrude to obtain the heat-resistant insulating material;

[0060] The heat-resistant insulation material comprises the following raw material components: by weight, 38 parts of polyvinyl chloride, 20 parts of polystyrene, 10 parts of maleic anhydride-grafted polystyrene, 3 parts of composite heat stabilizer I, 12 parts of composite filler, 3 parts of methyl methacrylate-butadiene-styrene terpolymer, and 1 part of lubricant.

[0061] S32: Flame-retardant and anti-aging material: Add each raw material component of the flame-retardant and anti-aging material into the extruder according to the formula ratio, control the screw speed at 100r / min, melt blend at 170℃ for 30min, and extrude to obtain the flame-retardant and anti-aging material;

[0062] The flame-retardant and anti-aging material comprises the following raw material components: by weight, 38 parts of polyvinyl chloride, 20 parts of polystyrene, 10 parts of maleic anhydride-grafted polystyrene, 3 parts of composite heat stabilizer II, 12 parts of composite filler, 3 parts of methyl methacrylate-butadiene-styrene terpolymer, and 1 part of lubricant.

[0063] Step 4: Preparation of anti-aging wire harness for automotive motors:

[0064] S41: Cross-sectional area 0.75mm 2After the pure copper conductive core is preheated to 70°C, a heat-resistant insulating material is extruded onto the conductive core using an extruder. After cooling, a tightly wrapped 0.7mm thick heat-resistant insulating layer is formed, resulting in the basic wire harness.

[0065] S42: The basic wire harness is fully wrapped with aluminum foil to form a 0.02mm thick aluminum foil shielding layer, resulting in the intermediate wire harness;

[0066] S43: After preheating the intermediate wire harness to 70°C, flame-retardant and anti-aging material is extruded onto the intermediate wire harness using an extruder. After cooling, a tightly wrapped 1mm thick flame-retardant and anti-aging layer is formed, resulting in an anti-aging wire harness for automotive motors.

[0067] The extrusion parameters are: melt temperature of 170±3℃, screw speed of 100r / min, and extrusion speed of 400m / min.

[0068] The following examples are based on Example 1, with Examples 2-3 and Comparative Examples 1-5 set up as follows:

[0069] Example 2: Example 2 is based on Example 1, but with adjustments to the following: the amount of raw material components for the temperature-resistant insulating material and the flame-retardant and anti-aging material.

[0070] A method for preparing an anti-aging wire harness for automotive motors:

[0071] Step 1: Prepare the composite heat stabilizer:

[0072] S11: Composite heat stabilizer I: The main heat stabilizer and the radiation heat stabilizer are mixed at a mass ratio of 4:1 to obtain composite heat stabilizer I;

[0073] S12: Composite Heat Stabilizer II: The main heat stabilizer and the radiation heat stabilizer are mixed at a mass ratio of 1:4 to obtain Composite Heat Stabilizer II;

[0074] Step 2: Preparation of composite filler: (1) Add DOPO and triethylamine to an appropriate amount of anhydrous ethanol, stir and mix evenly, then add carbon tetrachloride dropwise, and after the addition is complete, react at 0℃ for 3h; (2) Add aminoethylaminopropyltriethoxysilane to (1), react at 50℃ for 30h, end the reaction, and obtain modified aminoethylaminopropyltriethoxysilane after separation and purification; (3) Add modified aminoethylaminopropyltriethoxysilane to 95wt% ethanol aqueous solution, and add acetic acid to adjust the pH to 5, stir and mix for 30min, and prepare a silane hydrolysate with a concentration of 5wt%; (2) Mix calcium carbonate and aluminum nitride evenly at a mass ratio of 5:2, immerse in silane hydrolysate, stir slightly, wait 15min, take out, dry, and obtain composite filler;

[0075] The mass ratio of DOPO, triethylamine, carbon tetrachloride, and aminoethylaminopropyltriethoxysilane is 0.75:1:1:1.

[0076] Step 3: Preparation of temperature-resistant insulating materials and flame-retardant and anti-aging materials:

[0077] S31: Heat-resistant insulating material: Add each raw material component of the heat-resistant insulating material into the extruder according to the formula ratio, control the screw speed at 100r / min, melt and blend at 170℃ for 30min, and extrude to obtain the heat-resistant insulating material;

[0078] The heat-resistant insulating material comprises the following raw material components: by weight, 38 parts polyvinyl chloride, 18 parts polystyrene, 8 parts maleic anhydride-grafted polystyrene, 2 parts composite heat stabilizer I, 8 parts composite filler, 2 parts methyl methacrylate-butadiene-styrene terpolymer, and 0.5 parts lubricant.

[0079] S32: Flame-retardant and anti-aging material: Add each raw material component of the flame-retardant and anti-aging material into the extruder according to the formula ratio, control the screw speed at 100r / min, melt blend at 170℃ for 30min, and extrude to obtain the flame-retardant and anti-aging material;

[0080] The flame-retardant and anti-aging material comprises the following raw material components by weight: 38 parts polyvinyl chloride, 18 parts polystyrene, 8 parts maleic anhydride-grafted polystyrene, 2 parts composite heat stabilizer II, 8 parts composite filler, 2 parts methyl methacrylate-butadiene-styrene terpolymer, and 0.5 parts lubricant.

[0081] Step 4: Preparation of anti-aging wire harness for automotive motors:

[0082] S41: Cross-sectional area 0.75mm 2 After the pure copper conductive core is preheated to 70°C, a heat-resistant insulating material is extruded onto the conductive core using an extruder. After cooling, a tightly wrapped 0.7mm thick heat-resistant insulating layer is formed, resulting in the basic wire harness.

[0083] S42: The basic wire harness is fully wrapped with aluminum foil to form a 0.02mm thick aluminum foil shielding layer, resulting in the intermediate wire harness;

[0084] S43: After preheating the intermediate wire harness to 70°C, flame-retardant and anti-aging material is extruded onto the intermediate wire harness using an extruder. After cooling, a tightly wrapped 1mm thick flame-retardant and anti-aging layer is formed, resulting in an anti-aging wire harness for automotive motors.

[0085] The extrusion parameters are: melt temperature of 170±3℃, screw speed of 100r / min, and extrusion speed of 400m / min.

[0086] Example 3: Example 3 is based on Example 1, but with adjustments to the following: the amount of raw material components for the temperature-resistant insulating material and the flame-retardant and anti-aging material.

[0087] A method for preparing an anti-aging wire harness for automotive motors:

[0088] Step 1: Prepare the composite heat stabilizer:

[0089] S11: Composite heat stabilizer I: The main heat stabilizer and the radiation heat stabilizer are mixed at a mass ratio of 4:1 to obtain composite heat stabilizer I;

[0090] S12: Composite Heat Stabilizer II: The main heat stabilizer and the radiation heat stabilizer are mixed at a mass ratio of 1:4 to obtain Composite Heat Stabilizer II;

[0091] Step 2: Preparation of composite filler: (1) Add DOPO and triethylamine to an appropriate amount of anhydrous ethanol, stir and mix evenly, then add carbon tetrachloride dropwise, and after the addition is complete, react at 0℃ for 3h; (2) Add aminoethylaminopropyltriethoxysilane to (1), react at 50℃ for 30h, end the reaction, and obtain modified aminoethylaminopropyltriethoxysilane after separation and purification; (3) Add modified aminoethylaminopropyltriethoxysilane to 95wt% ethanol aqueous solution, and add acetic acid to adjust the pH to 5, stir and mix for 30min, and prepare a silane hydrolysate with a concentration of 5wt%; (2) Mix calcium carbonate and aluminum nitride evenly at a mass ratio of 5:2, immerse in silane hydrolysate, stir slightly, wait 15min, take out, dry, and obtain composite filler;

[0092] The mass ratio of DOPO, triethylamine, carbon tetrachloride, and aminoethylaminopropyltriethoxysilane is 0.75:1:1:1.

[0093] Step 3: Preparation of temperature-resistant insulating materials and flame-retardant and anti-aging materials:

[0094] S31: Heat-resistant insulating material: Add each raw material component of the heat-resistant insulating material into the extruder according to the formula ratio, control the screw speed at 100r / min, melt and blend at 170℃ for 30min, and extrude to obtain the heat-resistant insulating material;

[0095] The heat-resistant insulating material comprises the following raw material components: by weight, 38 parts polyvinyl chloride, 22 parts polystyrene, 12 parts maleic anhydride-grafted polystyrene, 4 parts composite heat stabilizer I, 16 parts composite filler, 4 parts methyl methacrylate-butadiene-styrene terpolymer, and 1.5 parts lubricant.

[0096] S32: Flame-retardant and anti-aging material: Add each raw material component of the flame-retardant and anti-aging material into the extruder according to the formula ratio, control the screw speed at 100r / min, melt blend at 170℃ for 30min, and extrude to obtain the flame-retardant and anti-aging material;

[0097] The flame-retardant and anti-aging material comprises the following raw material components: by weight, 38 parts polyvinyl chloride, 22 parts polystyrene, 12 parts maleic anhydride-grafted polystyrene, 4 parts composite heat stabilizer II, 16 parts composite filler, 4 parts methyl methacrylate-butadiene-styrene terpolymer, and 1.5 parts lubricant.

[0098] Step 4: Preparation of anti-aging wire harness for automotive motors:

[0099] S41: Cross-sectional area 0.75mm 2 After the pure copper conductive core is preheated to 70°C, a heat-resistant insulating material is extruded onto the conductive core using an extruder. After cooling, a tightly wrapped 0.7mm thick heat-resistant insulating layer is formed, resulting in the basic wire harness.

[0100] S42: The basic wire harness is fully wrapped with aluminum foil to form a 0.02mm thick aluminum foil shielding layer, resulting in the intermediate wire harness;

[0101] S43: After preheating the intermediate wire harness to 70°C, flame-retardant and anti-aging material is extruded onto the intermediate wire harness using an extruder. After cooling, a tightly wrapped 1mm thick flame-retardant and anti-aging layer is formed, resulting in an anti-aging wire harness for automotive motors.

[0102] The extrusion parameters are: melt temperature of 170±3℃, screw speed of 100r / min, and extrusion speed of 400m / min.

[0103] Comparative Example 1: Comparative Example 1 is based on Example 1, with the following adjustment: maleic anhydride-grafted polystyrene is not added, while other processes remain unchanged, as follows:

[0104] A method for preparing an anti-aging wire harness for automotive motors:

[0105] Step 1: Prepare the composite heat stabilizer:

[0106] S11: Composite heat stabilizer I: The main heat stabilizer and the radiation heat stabilizer are mixed at a mass ratio of 3:1 to obtain composite heat stabilizer I;

[0107] S12: Composite Heat Stabilizer II: The main heat stabilizer and the radiation heat stabilizer are mixed at a mass ratio of 1:3 to obtain Composite Heat Stabilizer II;

[0108] Step 2: Preparation of composite filler: (1) Add DOPO and triethylamine to an appropriate amount of anhydrous ethanol, stir and mix evenly, then add carbon tetrachloride dropwise, and after the addition is complete, react at 0℃ for 3h; (2) Add aminoethylaminopropyltriethoxysilane to (1), react at 50℃ for 30h, end the reaction, and obtain modified aminoethylaminopropyltriethoxysilane after separation and purification; (3) Add modified aminoethylaminopropyltriethoxysilane to 95wt% ethanol aqueous solution, and add acetic acid to adjust the pH to 5, stir and mix for 30min, and prepare a silane hydrolysate with a concentration of 5wt%; (2) Mix calcium carbonate and aluminum nitride evenly at a mass ratio of 5:2, immerse in silane hydrolysate, stir slightly, wait 15min, take out, dry, and obtain composite filler;

[0109] The mass ratio of DOPO, triethylamine, carbon tetrachloride, and aminoethylaminopropyltriethoxysilane is 0.75:1:1:1.

[0110] Step 3: Preparation of temperature-resistant insulating materials and flame-retardant and anti-aging materials:

[0111] S31: Heat-resistant insulating material: Add each raw material component of the heat-resistant insulating material into the extruder according to the formula ratio, control the screw speed at 100r / min, melt and blend at 170℃ for 30min, and extrude to obtain the heat-resistant insulating material;

[0112] The heat-resistant insulating material comprises the following raw material components: by weight, 38 parts of polyvinyl chloride, 20 parts of polystyrene, 3 parts of composite heat stabilizer I, 12 parts of composite filler, 3 parts of methyl methacrylate-butadiene-styrene terpolymer, and 1 part of lubricant.

[0113] S32: Flame-retardant and anti-aging material: Add each raw material component of the flame-retardant and anti-aging material into the extruder according to the formula ratio, control the screw speed at 100r / min, melt blend at 170℃ for 30min, and extrude to obtain the flame-retardant and anti-aging material;

[0114] The flame-retardant and anti-aging material comprises the following raw material components: by weight, 38 parts polyvinyl chloride, 20 parts polystyrene, 3 parts composite heat stabilizer II, 12 parts composite filler, 3 parts methyl methacrylate-butadiene-styrene terpolymer, and 1 part lubricant;

[0115] Step 4: Preparation of anti-aging wire harness for automotive motors:

[0116] S41: Cross-sectional area 0.75mm 2 After the pure copper conductive core is preheated to 70°C, a heat-resistant insulating material is extruded onto the conductive core using an extruder. After cooling, a tightly wrapped 0.7mm thick heat-resistant insulating layer is formed, resulting in the basic wire harness.

[0117] S42: The basic wire harness is fully wrapped with aluminum foil to form a 0.02mm thick aluminum foil shielding layer, resulting in the intermediate wire harness;

[0118] S43: After preheating the intermediate wire harness to 70°C, flame-retardant and anti-aging material is extruded onto the intermediate wire harness using an extruder. After cooling, a tightly wrapped 1mm thick flame-retardant and anti-aging layer is formed, resulting in an anti-aging wire harness for automotive motors.

[0119] The extrusion parameters are: melt temperature of 170±3℃, screw speed of 100r / min, and extrusion speed of 400m / min.

[0120] Comparative Example 2: Comparative Example 2 is based on Example 1, with the following adjustment: no auxiliary heat stabilizer is added, while other processes remain unchanged, as follows:

[0121] A method for preparing an anti-aging wire harness for automotive motors:

[0122] Step 1: Preparation of composite filler: (1) Add DOPO and triethylamine to an appropriate amount of anhydrous ethanol, stir and mix evenly, then add carbon tetrachloride dropwise, and after the addition is complete, react at 0℃ for 3h; (2) Add aminoethylaminopropyltriethoxysilane to (1), react at 50℃ for 30h, end the reaction, and obtain modified aminoethylaminopropyltriethoxysilane after separation and purification; (3) Add modified aminoethylaminopropyltriethoxysilane to 95wt% ethanol aqueous solution, and add acetic acid to adjust the pH to 5, stir and mix for 30min, and prepare a silane hydrolysate with a concentration of 5wt%; (2) Mix calcium carbonate and aluminum nitride evenly at a mass ratio of 5:2, immerse in silane hydrolysate, stir slightly, wait 15min, take out, dry, and obtain composite filler;

[0123] The mass ratio of DOPO, triethylamine, carbon tetrachloride, and aminoethylaminopropyltriethoxysilane is 0.75:1:1:1.

[0124] Step 2: Preparation of temperature-resistant insulating materials and flame-retardant and anti-aging materials:

[0125] S21: Heat-resistant insulating material: Add each raw material component of the heat-resistant insulating material into the extruder according to the formula ratio, control the screw speed at 100r / min, melt and blend at 170℃ for 30min, and extrude to obtain the heat-resistant insulating material;

[0126] The heat-resistant insulating material comprises the following raw material components: by weight, 38 parts polyvinyl chloride, 20 parts polystyrene, 10 parts maleic anhydride-grafted polystyrene, 3 parts main heat stabilizer, 12 parts composite filler, 3 parts methyl methacrylate-butadiene-styrene terpolymer, and 1 part lubricant.

[0127] S22: Flame-retardant and anti-aging material: Add each raw material component of the flame-retardant and anti-aging material into the extruder according to the formula ratio, control the screw speed at 100r / min, melt blend at 170℃ for 30min, and extrude to obtain the flame-retardant and anti-aging material;

[0128] The flame-retardant and anti-aging material comprises the following raw material components: by weight, 38 parts polyvinyl chloride, 20 parts polystyrene, 10 parts maleic anhydride-grafted polystyrene, 3 parts main heat stabilizer, 12 parts composite filler, 3 parts methyl methacrylate-butadiene-styrene terpolymer, and 1 part lubricant.

[0129] Step 3: Preparation of anti-aging wire harness for automotive motors:

[0130] S31: Cross-sectional area 0.75mm 2 After the pure copper conductive core is preheated to 70°C, a heat-resistant insulating material is extruded onto the conductive core using an extruder. After cooling, a tightly wrapped 0.7mm thick heat-resistant insulating layer is formed, resulting in the basic wire harness.

[0131] S32: The basic wire harness is fully wrapped with aluminum foil to form a 0.02mm thick aluminum foil shielding layer, resulting in the intermediate wire harness;

[0132] S33: After preheating the intermediate wire harness to 70°C, flame-retardant and anti-aging material is extruded onto the intermediate wire harness using an extruder. After cooling, a tightly wrapped 1mm thick flame-retardant and anti-aging layer is formed, resulting in an anti-aging wire harness for automotive motors.

[0133] The extrusion parameters are: melt temperature of 170±3℃, screw speed of 100r / min, and extrusion speed of 400m / min.

[0134] Comparative Example 3: Comparative Example 3 is based on Example 1, with the following adjustments: the flame-retardant and anti-aging layer also uses a temperature-resistant insulating material, that is, the composite heat stabilizer is composite heat stabilizer I. Other processes remain unchanged, as follows:

[0135] A method for preparing an anti-aging wire harness for automotive motors:

[0136] Step 1: Preparation of composite heat stabilizer I: Mix the main heat stabilizer and the radiation heat stabilizer at a mass ratio of 3:1 to obtain composite heat stabilizer I;

[0137] Step 2: Preparation of composite filler: (1) Add DOPO and triethylamine to an appropriate amount of anhydrous ethanol, stir and mix evenly, then add carbon tetrachloride dropwise, and after the addition is complete, react at 0℃ for 3h; (2) Add aminoethylaminopropyltriethoxysilane to (1), react at 50℃ for 30h, end the reaction, and obtain modified aminoethylaminopropyltriethoxysilane after separation and purification; (3) Add modified aminoethylaminopropyltriethoxysilane to 95wt% ethanol aqueous solution, and add acetic acid to adjust the pH to 5, stir and mix for 30min, and prepare a silane hydrolysate with a concentration of 5wt%; (2) Mix calcium carbonate and aluminum nitride evenly at a mass ratio of 5:2, immerse in silane hydrolysate, stir slightly, wait 15min, take out, dry, and obtain composite filler;

[0138] The mass ratio of DOPO, triethylamine, carbon tetrachloride, and aminoethylaminopropyltriethoxysilane is 0.75:1:1:1.

[0139] Step 3: Preparation of heat-resistant insulation material: Add each raw material component of the heat-resistant insulation material into the extruder according to the formula ratio, control the screw speed at 100 r / min, melt blend at 170℃ for 30 min, and extrude to obtain the heat-resistant insulation material;

[0140] The heat-resistant insulation material comprises the following raw material components: by weight, 38 parts of polyvinyl chloride, 20 parts of polystyrene, 10 parts of maleic anhydride-grafted polystyrene, 3 parts of composite heat stabilizer I, 12 parts of composite filler, 3 parts of methyl methacrylate-butadiene-styrene terpolymer, and 1 part of lubricant.

[0141] Step 4: Preparation of anti-aging wire harness for automotive motors:

[0142] S41: Cross-sectional area 0.75mm 2 After the pure copper conductive core is preheated to 70°C, a heat-resistant insulating material is extruded onto the conductive core using an extruder. After cooling, a tightly wrapped 0.7mm thick heat-resistant insulating layer is formed, resulting in the basic wire harness.

[0143] S42: The basic wire harness is fully wrapped with aluminum foil to form a 0.02mm thick aluminum foil shielding layer, resulting in the intermediate wire harness;

[0144] S43: After preheating the intermediate wire harness to 70°C, heat-resistant insulating material is extruded onto the intermediate wire harness using an extruder. After cooling, a tightly wrapped 1mm thick flame-retardant and anti-aging layer is formed, resulting in an anti-aging wire harness for automotive motors.

[0145] The extrusion parameters are: melt temperature of 170±3℃, screw speed of 100r / min, and extrusion speed of 400m / min.

[0146] Comparative Example 4: Comparative Example 4 is based on Example 1, with the following adjustments: only calcium carbonate is used as the filler, while other processes remain unchanged, as detailed below:

[0147] A method for preparing an anti-aging wire harness for automotive motors:

[0148] Step 1: Prepare the composite heat stabilizer:

[0149] S11: Composite heat stabilizer I: The main heat stabilizer and the radiation heat stabilizer are mixed at a mass ratio of 4:1 to obtain composite heat stabilizer I;

[0150] S12: Composite Heat Stabilizer II: The main heat stabilizer and the radiation heat stabilizer are mixed at a mass ratio of 1:4 to obtain Composite Heat Stabilizer II;

[0151] Step 2: Preparation of modified filler: (1) Add DOPO and triethylamine to an appropriate amount of anhydrous ethanol, stir and mix evenly, then add carbon tetrachloride dropwise. After the addition is complete, react at 0℃ for 3h; (2) Add aminoethylaminopropyltriethoxysilane to (1), react at 50℃ for 30h, end the reaction, and obtain modified aminoethylaminopropyltriethoxysilane after separation and purification; (3) Add modified aminoethylaminopropyltriethoxysilane to 95wt% ethanol aqueous solution, and add acetic acid to adjust the pH to 5, stir and mix for 30min to prepare a silane hydrolysate with a concentration of 5wt%; (2) Immerse calcium carbonate in the silane hydrolysate, stir gently, wait 15min, take it out, dry it, and obtain the modified filler;

[0152] The mass ratio of DOPO, triethylamine, carbon tetrachloride, and aminoethylaminopropyltriethoxysilane is 0.75:1:1:1.

[0153] Step 3: Preparation of temperature-resistant insulating materials and flame-retardant and anti-aging materials:

[0154] S31: Heat-resistant insulating material: Add each raw material component of the heat-resistant insulating material into the extruder according to the formula ratio, control the screw speed at 100r / min, melt and blend at 170℃ for 30min, and extrude to obtain the heat-resistant insulating material;

[0155] The heat-resistant insulating material comprises the following raw material components: by weight, 38 parts of polyvinyl chloride, 20 parts of polystyrene, 10 parts of maleic anhydride-grafted polystyrene, 3 parts of composite heat stabilizer I, 12 parts of modified filler, 3 parts of methyl methacrylate-butadiene-styrene terpolymer, and 1 part of lubricant.

[0156] S32: Flame-retardant and anti-aging material: Add each raw material component of the flame-retardant and anti-aging material into the extruder according to the formula ratio, control the screw speed at 100r / min, melt blend at 170℃ for 30min, and extrude to obtain the flame-retardant and anti-aging material;

[0157] The flame-retardant and anti-aging material comprises the following raw material components: by weight, 38 parts polyvinyl chloride, 20 parts polystyrene, 10 parts maleic anhydride-grafted polystyrene, 3 parts composite heat stabilizer II, 12 parts modified filler, 3 parts methyl methacrylate-butadiene-styrene terpolymer, and 1 part lubricant.

[0158] Step 4: Preparation of anti-aging wire harness for automotive motors:

[0159] S41: Cross-sectional area 0.75mm 2 After the pure copper conductive core is preheated to 70°C, a heat-resistant insulating material is extruded onto the conductive core using an extruder. After cooling, a tightly wrapped 0.7mm thick heat-resistant insulating layer is formed, resulting in the basic wire harness.

[0160] S42: The basic wire harness is fully wrapped with aluminum foil to form a 0.02mm thick aluminum foil shielding layer, resulting in the intermediate wire harness;

[0161] S43: After preheating the intermediate wire harness to 70°C, flame-retardant and anti-aging material is extruded onto the intermediate wire harness using an extruder. After cooling, a tightly wrapped 1mm thick flame-retardant and anti-aging layer is formed, resulting in an anti-aging wire harness for automotive motors.

[0162] The extrusion parameters are: melt temperature of 170±3℃, screw speed of 100r / min, and extrusion speed of 400m / min.

[0163] Comparative Example 5: Comparative Example 5 is based on Example 1, with the following adjustment: no modification treatment with aminoethylaminopropyltriethoxysilane is performed, while other processes remain unchanged, as follows:

[0164] A method for preparing an anti-aging wire harness for automotive motors:

[0165] Step 1: Prepare the composite heat stabilizer:

[0166] S11: Composite heat stabilizer I: The main heat stabilizer and the radiation heat stabilizer are mixed at a mass ratio of 4:1 to obtain composite heat stabilizer I;

[0167] S12: Composite Heat Stabilizer II: The main heat stabilizer and the radiation heat stabilizer are mixed at a mass ratio of 1:4 to obtain Composite Heat Stabilizer II;

[0168] Step 2: Preparation of composite filler: (1) Add aminoethylaminopropyltriethoxysilane to a 95wt% aqueous ethanol solution, and add acetic acid to adjust the pH to 5. Stir and mix for 30 min to prepare a silane hydrolysate with a concentration of 5wt%; (2) Mix calcium carbonate and aluminum nitride at a mass ratio of 5:2, immerse them in the silane hydrolysate, stir gently, and after 15 min, take them out and dry them to obtain the composite filler;

[0169] Step 3: Preparation of temperature-resistant insulating materials and flame-retardant and anti-aging materials:

[0170] S31: Heat-resistant insulating material: Add each raw material component of the heat-resistant insulating material into the extruder according to the formula ratio, control the screw speed at 100r / min, melt and blend at 170℃ for 30min, and extrude to obtain the heat-resistant insulating material;

[0171] The heat-resistant insulating material comprises the following raw material components: by weight, 38 parts of polyvinyl chloride, 20 parts of polystyrene, 10 parts of maleic anhydride-grafted polystyrene, 3 parts of composite heat stabilizer I, 12 parts of modified filler, 3 parts of methyl methacrylate-butadiene-styrene terpolymer, and 1 part of lubricant.

[0172] S32: Flame-retardant and anti-aging material: Add each raw material component of the flame-retardant and anti-aging material into the extruder according to the formula ratio, control the screw speed at 100r / min, melt blend at 170℃ for 30min, and extrude to obtain the flame-retardant and anti-aging material;

[0173] The flame-retardant and anti-aging material comprises the following raw material components: by weight, 38 parts polyvinyl chloride, 20 parts polystyrene, 10 parts maleic anhydride-grafted polystyrene, 3 parts composite heat stabilizer II, 12 parts modified filler, 3 parts methyl methacrylate-butadiene-styrene terpolymer, and 1 part lubricant.

[0174] Step 4: Preparation of anti-aging wire harness for automotive motors:

[0175] S41: Cross-sectional area 0.75mm 2 After the pure copper conductive core is preheated to 70°C, a heat-resistant insulating material is extruded onto the conductive core using an extruder. After cooling, a tightly wrapped 0.7mm thick heat-resistant insulating layer is formed, resulting in the basic wire harness.

[0176] S42: The basic wire harness is fully wrapped with aluminum foil to form a 0.02mm thick aluminum foil shielding layer, resulting in the intermediate wire harness;

[0177] S43: After preheating the intermediate wire harness to 70°C, flame-retardant and anti-aging material is extruded onto the intermediate wire harness using an extruder. After cooling, a tightly wrapped 1mm thick flame-retardant and anti-aging layer is formed, resulting in an anti-aging wire harness for automotive motors.

[0178] The extrusion parameters are: melt temperature of 170±3℃, screw speed of 100r / min, and extrusion speed of 400m / min.

[0179] Performance testing: The anti-aging wire harnesses for automotive motors prepared in Examples 1-3 and Comparative Examples 1-5 were subjected to heat aging resistance, UV aging resistance, and flame retardancy tests. A 50cm long anti-aging wire harness for automotive motors was used as a test sample, and the performance tests were conducted according to the following methods:

[0180] 1. Heat aging resistance test: The wire harness test sample is placed in a heat aging test chamber and placed at 135℃ for 168 hours to conduct heat aging resistance test. Finally, the change in mass before and after aging is tested.

[0181] 2. UV aging resistance test: The wire harness test sample was placed in a 200W mercury light source irradiation accelerated aging chamber for 360 hours to test its UV aging resistance. Finally, the change in mass before and after aging was tested.

[0182] 3. Flame retardant performance test: Test its limiting oxygen index to evaluate its flame retardant performance.

[0183] The specific test results are shown in Table 1 below:

[0184] Table 1

[0185]

[0186] Results Analysis: As shown in Table 1 above, this invention significantly improves the heat aging resistance, UV aging resistance, and flame retardant properties of the wiring harness by improving the compatibility of polystyrene and polyvinyl chloride through the addition of maleic anhydride-grafted polystyrene, optimizing the ratio of primary and secondary heat stabilizers in different layers, and selecting and modifying the fillers. In other words, the wiring harness exhibits excellent anti-aging and safety performance, enabling it to adapt to more demanding working environments and greatly ensuring the normal operation of automotive internal systems.

[0187] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing an anti-aging wire harness for automotive motors, characterized in that: Includes the following steps: Step 1: After preheating the conductive core, use an extruder to extrude the heat-resistant insulating material onto the conductive core. After cooling, a heat-resistant insulating layer is formed, resulting in the basic wire harness. Step 2: Use aluminum foil to fully cover the basic wire harness to form an aluminum foil shielding layer, thus obtaining the intermediate wire harness; Step 3: After preheating the intermediate wire harness, use an extruder to extrude flame-retardant and anti-aging material onto the intermediate wire harness. After cooling, a flame-retardant and anti-aging layer is formed, resulting in an anti-aging wire harness for automotive motors. The heat-resistant insulating material comprises the following raw material components: by weight, 34-40 parts of polyvinyl chloride, 18-22 parts of polystyrene, 8-12 parts of maleic anhydride-grafted polystyrene, 2-4 parts of composite heat stabilizer I, 8-16 parts of composite filler, 2-4 parts of toughening agent, and 0.5-1.5 parts of lubricant. The flame-retardant and anti-aging material comprises the following raw material components: by weight, 34-40 parts of polyvinyl chloride, 18-22 parts of polystyrene, 8-12 parts of maleic anhydride-grafted polystyrene, 2-4 parts of composite heat stabilizer II, 8-16 parts of composite filler, 2-4 parts of toughening agent, and 0.5-1.5 parts of lubricant. The composite heat stabilizer I is obtained by mixing a primary heat stabilizer and an auxiliary heat stabilizer in a mass ratio of (3~5):

1. The composite heat stabilizer II is obtained by mixing a primary heat stabilizer and an auxiliary heat stabilizer in a mass ratio of 1:(3~5); The preparation method of maleic anhydride-grafted polystyrene is as follows: polystyrene, maleic anhydride, and dicumyl peroxide are mixed evenly and then added into an extruder. The screw speed is controlled at 30~50 r / min, and the mixture is melt-blended at 160~200℃ for 20~30 min. The mixture is then extruded to obtain maleic anhydride-grafted polystyrene. The preparation method of the auxiliary heat stabilizer is as follows: (1) Diethanolamine was added to the reaction vessel, and the mixture was stirred and heated to 65-75°C. A quantitative amount of paraformaldehyde was added every 15 minutes for a total of four times. After the addition was completed, the mixture was stirred and heated to 75-85°C for 2-4 hours. Finally, a methanol solution of 2,2'-4,4'-tetrahydroxybenzophenone was added to the reaction system, and the reaction was kept at the temperature for 2-4 hours. The reaction was then stopped, and the mixture was allowed to cool naturally to room temperature. After separation and purification, the 2,2'-4,4'-tetrahydroxybenzophenone derivative grafted with diethanolamine was obtained. (2) Under nitrogen protection, 3-mercaptopropionic acid and diethanolamine grafted with 2,2'-4,4'-tetrahydroxybenzophenone derivative were added to acetone and stirred until homogeneous. Then, 1,3-dicyclohexylcarbodiimide and 4-dimethylaminopyridine were added and stirred for 24-36 h. The reaction was then stopped and the product was separated and purified to obtain 3-mercaptopropionic acid grafted with 2,2'-4,4'-tetrahydroxybenzophenone derivative. (3) 3-mercaptopropionic acid grafted with 2,2'-4,4'-tetrahydroxybenzophenone derivative, styrene-maleic anhydride copolymer, and photoinitiator were added to acetone, stirred and mixed evenly, and then treated with 365nm ultraviolet light for 1-2 hours under stirring to end the reaction. After separation and purification, styrene-maleic anhydride copolymer grafted with 2,2'-4,4'-tetrahydroxybenzophenone derivative was obtained. (4) Grafting 2,2'-4,4'-tetrahydroxybenzophenone derivative onto styrene-maleic anhydride copolymer and adding it to acetone, stirring and mixing evenly, then adding 5wt% sodium hydroxide aqueous solution to adjust the pH to 6.5-7 to obtain reaction solution A; adding lanthanum nitrate to acetone and stirring and mixing evenly to obtain reaction solution B; under stirring, slowly adding reaction solution B to reaction solution A, and after the addition is complete, continue stirring and reacting for 2-4 hours, and finally let it stand at room temperature for 12 hours, and after separation and purification, obtain the auxiliary heat stabilizer; The composite filler is obtained by uniformly mixing calcium carbonate and aluminum nitride at a mass ratio of 5:(1~3), and then modifying it with modified aminoethylaminopropyltriethoxysilane. The specific method is as follows: (1) Add DOPO and triethylamine to anhydrous ethanol, stir and mix evenly, then add carbon tetrachloride dropwise. After the addition is complete, react at -20~20℃ for 2~4h. (2) Add aminoethylaminopropyltriethoxysilane to (1) and react at 40~60℃ for 24~36h. After the reaction is stopped, the modified aminoethylaminopropyltriethoxysilane is obtained by separation and purification. (3) Add the modified aminoethylaminopropyltriethoxysilane to a 95wt% aqueous ethanol solution, and add acetic acid to adjust the pH to 4.5~5.

5. Stir and mix for 25~35 min to prepare a silane hydrolysate with a concentration of 2~5wt%. (4) Immerse the well-mixed calcium carbonate and aluminum nitride in the silane hydrolysate, stir gently, and after 10-20 minutes, take it out and dry it to obtain the composite filler.

2. The method for preparing an anti-aging wire harness for automotive motors according to claim 1, characterized in that: The mass ratio of polystyrene, maleic anhydride, and dicumyl peroxide is 1:(0.02~0.05):(0.004~0.01).

3. The method for preparing an anti-aging wire harness for automotive motors according to claim 1, characterized in that: The primary heat stabilizer is a metal soap-based heat stabilizer, specifically including one or more combinations of lead stearate, barium stearate, calcium stearate, zinc stearate, magnesium stearate, barium ricinoleate, cadmium ricinoleate, and calcium ricinoleate.

4. The method for preparing an anti-aging wire harness for automotive motors according to claim 1, characterized in that: The mass ratio of diethanolamine, paraformaldehyde, and 2,2'-4,4'-tetrahydroxybenzophenone is (2~2.5):(0.15~0.2):1; The mass ratio of 3-mercaptopropionic acid, diethanolamine-grafted 2,2'-4,4'-tetrahydroxybenzophenone derivative, 1,3-dicyclohexylcarbodiimide, and 4-dimethylaminopyridine is (1.1~1.3):1:(0.15~0.25):(0.015~0.025). The mass ratio of the 3-mercaptopropionic acid grafted with 2,2'-4,4'-tetrahydroxybenzophenone derivative, styrene-maleic anhydride copolymer, and photoinitiator is (0.4~0.6):1:(0.05~0.1). The styrene-maleic anhydride copolymer grafted with 2,2'-4,4'-tetrahydroxybenzophenone derivative and lanthanum nitrate has a mass ratio of 1:(0.1~0.2).

5. The method for preparing an anti-aging wire harness for automotive motors according to claim 1, characterized in that: The mass ratio of DOPO, triethylamine, carbon tetrachloride, and aminoethylaminopropyltriethoxysilane is (0.7~0.8):1:1:

1.

6. The method for preparing an anti-aging wire harness for automotive motors according to claim 1, characterized in that: The toughening agent is a methyl methacrylate-butadiene-styrene terpolymer.

7. The method for preparing an anti-aging wire harness for automotive motors according to claim 1, characterized in that: The preparation method of the heat-resistant insulating material is as follows: add each raw material component of the heat-resistant insulating material into the extruder according to the formula ratio, control the screw speed at 80~100r / min, melt blend at 160~180℃ for 20~30min, and extrude to obtain the heat-resistant insulating material; The preparation method of the flame-retardant and anti-aging material is as follows: add each raw material component of the flame-retardant and anti-aging material into the extruder according to the formula ratio, control the screw speed at 80~100r / min, melt blend at 160~180℃ for 20~30min, and extrude to obtain the flame-retardant and anti-aging material.

8. The method for preparing an anti-aging wire harness for automotive motors according to claim 1, characterized in that: The extrusion parameters are: melt temperature of 160~180℃, screw speed of 80~100r / min, and extrusion speed of 300~500m / min.

9. The method for preparing an anti-aging wire harness for automotive motors according to claim 1, characterized in that: The cross-sectional area of ​​the conductive wire core is 0.35~1mm². 2 The thickness of the heat-resistant insulation layer is 0.5~1mm; the thickness of the aluminum foil shielding layer is 0.01~0.03mm; and the thickness of the flame-retardant and anti-aging layer is 1mm.

10. The anti-aging wire harness for automotive motors prepared by the method according to any one of claims 1 to 9, characterized in that: Its structure includes, in sequence, a conductive core, a heat-resistant insulation layer wrapped around the conductive core, an aluminum foil shielding layer wrapped around the heat-resistant insulation layer, and a flame-retardant and anti-aging layer wrapped around the aluminum foil shielding layer.

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