Preparation process of ultra-thin paint film transposed conductor

Abstract

The present application relates to the technical field of transposed conductor, in particular to a preparation process of super-thin paint film transposed conductor, comprising the following steps: coating the base material with acetal paint, then coating with intermediate modified paint, and finally coating with outer paint, processing the treated copper wire into transposed conductor, so as to obtain the super-thin paint film transposed conductor. The super-thin paint film transposed conductor is made of copper wire, which is cleaned with anhydrous ethanol, and then coated with acetal paint, intermediate modified paint and outer paint. Finally, the transposed conductor is made by a transposed conductor device and a wrapping device. The product has excellent electrical performance, heat conduction performance, salt spray resistance and high temperature resistance. Meanwhile, the product has excellent impact resistance and waterproof effect, and the comprehensive coordination of the product is balanced and improved.

Description

Technical Field

[0001] This invention relates to the field of transposed conductor technology, and more specifically to a preparation process for an ultrathin enamel film transposed conductor. Background Technology

[0002] In the manufacturing of electrical equipment such as motors and transformers, the performance of conductors directly affects the overall quality of the equipment. Currently, the widely used conductor coatings often face a dilemma: pursuing a thicker coating to ensure certain performance leads to an increase in equipment size; while attempting to reduce size by thinning the coating affects the coating's performance.

[0003] In order to reduce the thickness of the enamel film, traditional conductor coatings reduce electrical performance to some extent, affecting the conductor's ability to protect against electric shock. They also affect the product's resistance to salt spray and high temperature, making it difficult to balance the overall performance of the product. Furthermore, the product's impact resistance and water resistance are poor, further limiting the product's efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a fabrication process for ultrathin enamel-coated transposed conductors, thereby resolving the problems mentioned in the background section.

[0005] The present invention solves the technical problem by adopting the following technical solution:

[0006] This invention provides a process for preparing ultrathin transposed conductive wires, comprising the following steps:

[0007] Step 1: Using copper wire as the substrate, ultrasonically clean it with anhydrous ethanol for 12-15 minutes at an ultrasonic power of 350-400W. After ultrasonic cleaning, dry it at 145-155℃ until the surface moisture content is less than 0.1%.

[0008] Step 2: Coat the substrate treated in Step 1 with acetal paint with a thickness of 0.01-0.02mm, then coat with intermediate modified paint with a thickness of 0.03-0.04mm, and finally coat with outer paint with a thickness of 0.02-0.03mm.

[0009] Step 3: Process the copper wires processed in Step 2 into transposed conductors to obtain ultra-thin enamel transposed conductors.

[0010] Preferably, the coating process employs a drying treatment at a temperature of 180-500℃ for 20-30 minutes.

[0011] The specific operation method for processing copper wire into transposed conductors is as follows:

[0012] 5-87 copper wires from step two are braided into a transposed wire bundle using a transposed wire device. An insulating mesh is then wrapped around the transposed wire bundle using a wrapping device to form an insulating mesh layer. The thickness of the insulating mesh layer is 0.23-0.28 mm, and the wrapping tension of the insulating mesh is controlled at 15-23 N.

[0013] Preferably, the intermediate modified paint comprises the following raw materials in parts by weight:

[0014] Epoxy resin E51 30-35 parts, synergist based on nanocellulose-zirconium silicate co-modification 8-12 parts, modifier doped with nano aluminum nitride 7-11 parts, curing agent 4-7 parts, curing accelerator 3-5 parts, ethanol solvent 20-25 parts and silane coupling agent KH560 4-7 parts.

[0015] Preferably, the curing agent is p-xyleneamine; the curing accelerator is 2-methylimidazole.

[0016] Preferably, the preparation method of the synergist based on nanocellulose-zirconium silicate co-modification is as follows:

[0017] S01: First, prepare a sodium alginate solution with a mass fraction of 10-15% and a sodium silicate solution with a mass fraction of 4-7%.

[0018] The following quantities are measured by weight: 5-8 parts of nanocellulose, 2-5 parts of lanthanum oxide, 8-12 parts of sodium alginate solution, and 1-3 parts of sodium silicate solution are mixed and stirred evenly to obtain a nanocellulose-based blend.

[0019] SO2: Preparation of zirconium silicate-based modifiers:

[0020] S02a: 3-5 parts zirconium silicate, 2-4 parts diamond powder, and 1-3 parts alumina are blended and sintered for 1-1.5 hours at a sintering temperature of 300-350℃ for 1-2 hours. After sintering, zirconium silicate composite material is obtained.

[0021] S02b: Mix 2-4 parts of sodium carboxymethyl cellulose, 1-2 parts of nano silica sol, 5-8 parts of dopamine hydrochloride solution and 2-3 parts of citric acid thoroughly to obtain the modified solution;

[0022] Mix 5-8 parts of zirconium silicate composite material and 8-11 parts of modification liquid thoroughly, then filter and dry to obtain zirconium silicate composite modifier;

[0023] S03: The nanocellulose-based blending liquid and the zirconium silicate-based modifier were ball-milled at a weight ratio of (11-15):7. After ball milling, the mixture was filtered and dried to obtain the synergist based on nanocellulose-zirconium silicate co-modification.

[0024] Preferably, the mass fraction of the hydrochloric acid dopamine solution is 7-11%; the ball milling speed in the SO3 is 1200-1500 r / min, and the ball milling time is 2-3 h.

[0025] The additive based on nanocellulose-zirconium silicate co-modification uses a nanocellulose-based blending liquid and a zirconium silicate-based modifier to be ball-milled together. The nanocellulose-based blending liquid is made by blending nanocellulose with lanthanum oxide, sodium alginate solution and sodium silicate solution. The nanocellulose is blended with sodium alginate solution and sodium silicate solution to form a network structure with excellent toughness. The long chain structure of nanocellulose can disperse stress, and the hydroxyl groups of sodium alginate form hydrogen bonds with nanocellulose, giving the system good ductility and solving the problem that traditional rigid fillers are prone to causing embrittlement of the paint film.

[0026] The zirconium silicate modifier uses a combination of zirconium silicate material and a modifying liquid for blending and optimization. Zirconium silicate itself has excellent dielectric properties. Combined with alumina, which has good insulation properties, and diamond powder, and using these three as the matrix, it not only optimizes the insulation of the product, but also improves the product's comprehensive performance such as high temperature resistance and salt spray resistance. Furthermore, the blending of the raw materials in the modifying liquid further enhances the performance of the product system.

[0027] Preferably, the preparation method of the doped nano-aluminum nitride modifier is as follows:

[0028] S11: Stir the nano-aluminum nitride thoroughly in a sufficient amount of potassium permanganate solution with a mass fraction of 10-15%, and then wash it with boiling water 3-5 times to obtain pretreated nano-aluminum nitride.

[0029] β-cyclodextrin, silane coupling agent KH550 and ethanol aqueous solution were mixed thoroughly at a weight ratio of (3-5):2:(5-8) to obtain β-cyclodextrin solution;

[0030] S12: According to the weight parts, 3-5 parts of graphene, 2-4 parts of titanium dioxide and 5-8 parts of β-cyclodextrin solution are thoroughly mixed to obtain graphene solution; 4-7 parts of pretreated nano-aluminum nitride and 5-8 parts of graphene solution are subjected to ultrasonic treatment. After the ultrasonic treatment is completed, nano-aluminum nitride-graphene hybrid solution is obtained.

[0031] S13: Nano-aluminum nitride-graphene hybrid liquid and basalt fiber agent are mixed at a weight ratio of (7-11):5 and ball-milled at a speed of 1000-1500 r / min for 2-3 h. After ball milling, the mixture is filtered and dried to obtain a nano-aluminum nitride-doped blending agent.

[0032] Nano-aluminum nitride exhibits excellent thermal conductivity. It is further improved by activation with potassium permanganate solution and optimized by ultrasonic treatment with graphene liquid. The graphene, titanium dioxide, and β-cyclodextrin in the graphene liquid are mutually harmonized and improved. The combination of graphene-titanium dioxide and nano-aluminum nitride further enhances the performance of the system.

[0033] The β-cyclodextrin, silane coupling agent KH550, and ethanol aqueous solution in the β-cyclodextrin solution are optimized through mutual interaction. β-cyclodextrin is amphiphilic, and the silane coupling agent KH550 has an amino group (-NH2) at one end of its molecule that can bind to β-cyclodextrin, while the siloxane group at the other end can react with the hydroxyl groups on the surface of inorganic components such as nano-aluminum nitride, graphene, and titanium dioxide to form chemical bonds, effectively improving the interfacial compatibility between inorganic fillers and organic matrices.

[0034] Preferably, the mass fraction of the ethanol-water solution is 75-85%; the ultrasonic power of the ultrasonic treatment is 450-500W, and the ultrasonic treatment lasts for 1-2 hours.

[0035] Preferably, the preparation method of the basalt fiber agent is as follows:

[0036] Basalt fibers are preheated at 55-60℃ for 1-2 hours to obtain preheated basalt fibers. The preheated basalt fibers are then immersed in a treatment solution with a weight of 5-8 times the total weight of the preheated basalt fibers. The immersion ultrasonic power is 350-400W, and the immersion time is 1-2 hours. After immersion, the solution is filtered and dried to obtain basalt fiber agent.

[0037] The treatment solution comprises the following raw materials in parts by weight: 3-5 parts mica powder, 2-5 parts quartz powder, 2-3 parts halloysite nanotubes, and 5-8 parts sodium dodecyl sulfate solution with a mass fraction of 10-15%.

[0038] Mica powder and quartz powder possess excellent mechanical stability. When attached to the fiber surface, they form a "reinforcing skeleton," directly improving the tensile strength, abrasion resistance, and impact resistance of basalt fibers. Halloysite nanotubes can fill the tiny pores on the fiber surface, further optimizing the fiber's structural density and reducing stress concentration under load. Simultaneously, both mica powder and quartz powder are chemically inert minerals, and their coating can form a "barrier" on the basalt fiber surface, reducing the fiber's sensitivity to corrosive media such as water, acids, and alkalis, and extending the fiber's service life in complex environments. Thus, the basalt fiber agent further enhances the product's performance within the system.

[0039] Preferably, the preparation method of the exterior paint is as follows:

[0040] Add 120-130 parts by weight of xylene to a reaction vessel and heat to 45-50℃. Then add 100-120 parts by weight of epoxy resin with a number average molecular weight of 5000-8000 and a softening point of 145-150℃. Maintain the temperature and stir. Cool to room temperature, then add 45-50 parts by weight of 3-methyltetrahydrophthalic anhydride, 2-3 parts by weight of epoxidized soybean oil, and 0.5-0.7 parts by weight of polypropylene ester with a number average molecular weight of 5000-6000. Stir and react for 2 hours at a stirring speed of 150-170 r / min. After stirring, the outer coating is obtained. The outer coating is made using existing technology, which is simple and further enhances the overall performance of the product.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] This invention relates to an ultra-thin enamel-coated transposed conductor. The conductor is made by cleaning copper wire with anhydrous ethanol, then coating it with acetal enamel, intermediate modified enamel, and an outer enamel coating. Finally, it is manufactured using a transposed conductor device and a wrapping device. The product exhibits excellent electrical performance, thermal conductivity, salt spray resistance, and high-temperature resistance. Simultaneously, it demonstrates superior impact resistance and water resistance. The overall performance of the product is balanced and improved. This process, through a three-layer ultra-thin functional enamel film design and the synergistic effect of the core modifier, achieves extreme thinning of the enamel film while ensuring and even enhancing overall performance: the bottom acetal enamel ensures tight adhesion to the copper substrate; the middle modified enamel layer provides core functions such as electrical insulation, thermal conductivity, and mechanical protection; and the outer enamel layer enhances weather resistance. Through layer-by-layer optimization, the resulting ultra-thin enamel-coated transposed conductor achieves comprehensive performance improvements. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. 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.

[0044] The fabrication process of an ultrathin enamel-coated transposed conductor according to this embodiment includes the following steps:

[0045] Step 1: Using copper wire as the substrate, ultrasonically clean it with anhydrous ethanol for 12-15 minutes at an ultrasonic power of 350-400W. After ultrasonic cleaning, dry it at 145-155℃ until the surface moisture content is less than 0.1%.

[0046] Step 2: Coat the substrate treated in Step 1 with acetal paint with a thickness of 0.01-0.02mm, then coat with intermediate modified paint with a thickness of 0.03-0.04mm, and finally coat with outer paint with a thickness of 0.02-0.03mm.

[0047] Step 3: Process the copper wires processed in Step 2 into transposed conductors to obtain ultra-thin enamel transposed conductors.

[0048] In this embodiment, the coating process uses drying treatment, with a drying temperature of 180-500℃ and a drying time of 20-30 minutes.

[0049] The specific operation method for processing copper wire into transposed conductors is as follows:

[0050] 5-87 copper wires from step two are braided into a transposed wire bundle using a transposed wire device. An insulating mesh is then wrapped around the transposed wire bundle using a wrapping device to form an insulating mesh layer. The thickness of the insulating mesh layer is 0.23-0.28 mm, and the wrapping tension of the insulating mesh is controlled at 15-23 N.

[0051] The intermediate modified paint of this embodiment includes the following raw materials in parts by weight:

[0052] Epoxy resin E51 30-35 parts, synergist based on nanocellulose-zirconium silicate co-modification 8-12 parts, modifier doped with nano aluminum nitride 7-11 parts, curing agent 4-7 parts, curing accelerator 3-5 parts, ethanol solvent 20-25 parts and silane coupling agent KH560 4-7 parts.

[0053] In this embodiment, the curing agent is p-xyleneamine; the curing accelerator is 2-methylimidazole.

[0054] The preparation method of the synergist based on nanocellulose-zirconium silicate co-modification in this embodiment is as follows:

[0055] S01: First, prepare a sodium alginate solution with a mass fraction of 10-15% and a sodium silicate solution with a mass fraction of 4-7%.

[0056] The following quantities are measured by weight: 5-8 parts of nanocellulose, 2-5 parts of lanthanum oxide, 8-12 parts of sodium alginate solution, and 1-3 parts of sodium silicate solution are mixed and stirred evenly to obtain a nanocellulose-based blend.

[0057] SO2: Preparation of zirconium silicate-based modifiers:

[0058] S02a: 3-5 parts zirconium silicate, 2-4 parts diamond powder, and 1-3 parts alumina are blended and sintered for 1-1.5 hours at a sintering temperature of 300-350℃ for 1-2 hours. After sintering, zirconium silicate composite material is obtained.

[0059] S02b: Mix 2-4 parts of sodium carboxymethyl cellulose, 1-2 parts of nano silica sol, 5-8 parts of dopamine hydrochloride solution and 2-3 parts of citric acid thoroughly to obtain the modified solution;

[0060] Mix 5-8 parts of zirconium silicate composite material and 8-11 parts of modification liquid thoroughly, then filter and dry to obtain zirconium silicate composite modifier;

[0061] S03: The nanocellulose-based blending liquid and the zirconium silicate-based modifier were ball-milled at a weight ratio of (11-15):7. After ball milling, the mixture was filtered and dried to obtain the synergist based on nanocellulose-zirconium silicate co-modification.

[0062] In this embodiment, the mass fraction of the hydrochloric acid dopamine solution is 7-11%; the ball milling speed in SO3 is 1200-1500 r / min, and the ball milling time is 2-3 h.

[0063] The preparation method of the doped nano-aluminum nitride modifier in this embodiment is as follows:

[0064] S11: Stir the nano-aluminum nitride thoroughly in a sufficient amount of potassium permanganate solution with a mass fraction of 10-15%, and then wash it with boiling water 3-5 times to obtain pretreated nano-aluminum nitride.

[0065] β-cyclodextrin, silane coupling agent KH550 and ethanol aqueous solution were mixed thoroughly at a weight ratio of (3-5):2:(5-8) to obtain β-cyclodextrin solution;

[0066] S12: According to the weight parts, 3-5 parts of graphene, 2-4 parts of titanium dioxide and 5-8 parts of β-cyclodextrin solution are thoroughly mixed to obtain graphene solution; 4-7 parts of pretreated nano-aluminum nitride and 5-8 parts of graphene solution are subjected to ultrasonic treatment. After the ultrasonic treatment is completed, nano-aluminum nitride-graphene hybrid solution is obtained.

[0067] S13: Nano-aluminum nitride-graphene hybrid liquid and basalt fiber agent are mixed at a weight ratio of (7-11):5 and ball-milled at a speed of 1000-1500 r / min for 2-3 h. After ball milling, the mixture is filtered and dried to obtain a nano-aluminum nitride-doped blending agent.

[0068] In this embodiment, the mass fraction of the ethanol-water solution is 75-85%; the ultrasonic power for ultrasonic treatment is 450-500W, and the ultrasonic treatment lasts for 1-2 hours.

[0069] The preparation method of the basalt fiber agent in this embodiment is as follows:

[0070] Basalt fibers are preheated at 55-60℃ for 1-2 hours to obtain preheated basalt fibers. The preheated basalt fibers are then immersed in a treatment solution with a weight of 5-8 times the total weight of the preheated basalt fibers. The immersion ultrasonic power is 350-400W, and the immersion time is 1-2 hours. After immersion, the solution is filtered and dried to obtain basalt fiber agent.

[0071] The treatment solution comprises the following raw materials in parts by weight: 3-5 parts mica powder, 2-5 parts quartz powder, 2-3 parts halloysite nanotubes, and 5-8 parts sodium dodecyl sulfate solution with a mass fraction of 10-15%.

[0072] The preparation method of the exterior paint in this embodiment is as follows:

[0073] Add 120-130 parts by weight of xylene to a reaction vessel, heat to 45-50℃, then add 100-120 parts by weight of epoxy resin with a number average molecular weight of 5000-8000 and a softening point of 145-150℃, keep warm and stir, cool to room temperature, then add 45-50 parts by weight of 3-methyltetrahydrophthalic anhydride, 2-3 parts by weight of epoxidized soybean oil and 0.5-0.7 parts by weight of polypropylene ester with a number average molecular weight of 5000-6000 and stir to react for 2 hours at a stirring speed of 150-170 r / min. After stirring is finished, the outer paint is obtained.

[0074] Example 1.

[0075] The fabrication process of an ultrathin enamel-coated transposed conductor according to this embodiment includes the following steps:

[0076] Step 1: Using copper wire as the substrate, ultrasonically clean it with anhydrous ethanol for 12 minutes at an ultrasonic power of 350W. After ultrasonic cleaning, dry it at 145℃ until the surface moisture content is less than 0.1%.

[0077] Step 2: Coat the substrate treated in Step 1 with acetal paint to a thickness of 0.01mm, then coat with intermediate modified paint to a thickness of 0.03mm, and finally coat with outer paint to a thickness of 0.02mm.

[0078] Step 3: Process the copper wires processed in Step 2 into transposed conductors to obtain ultra-thin enamel transposed conductors.

[0079] In this embodiment, the coating process uses a drying treatment at a temperature of 180°C for 20 minutes.

[0080] The specific operation method for processing copper wire into transposed conductors is as follows:

[0081] Five copper wires from step two are braided into a transposed wire bundle using a transposed wire device. An insulating mesh is then wrapped around the transposed wire bundle using a wrapping device to form an insulating mesh layer. The thickness of the insulating mesh layer is 0.23 mm, and the wrapping tension of the insulating mesh is controlled at 15 N.

[0082] The intermediate modified paint of this embodiment includes the following raw materials in parts by weight:

[0083] 30 parts of epoxy resin E51, 8 parts of synergist based on nanocellulose-zirconium silicate co-modification, 7 parts of comprehensive modifier doped with nano aluminum nitride, 4 parts of curing agent, 3 parts of curing accelerator, 20 parts of ethanol solvent and 4 parts of silane coupling agent KH560.

[0084] In this embodiment, the curing agent is p-xyleneamine; the curing accelerator is 2-methylimidazole.

[0085] The preparation method of the synergist based on nanocellulose-zirconium silicate co-modification in this embodiment is as follows:

[0086] S01: First, prepare a 10% sodium alginate solution and a 4% sodium silicate solution.

[0087] The following quantities are measured by weight: 5 parts of nanocellulose, 2 parts of lanthanum oxide, 8 parts of sodium alginate solution, and 1 part of sodium silicate solution are mixed and stirred evenly to obtain a nanocellulose-based blend.

[0088] SO2: Preparation of zirconium silicate-based modifiers:

[0089] S02a: 3 parts zirconium silicate, 2 parts diamond powder and 1 part alumina are blended and sintered for 1 hour at a sintering temperature of 300℃. After sintering is completed, zirconium silicate composite material is obtained.

[0090] S02b: 2 parts sodium carboxymethyl cellulose, 1 part nano silica sol, 5 parts dopamine hydrochloride solution and 2 parts citric acid are mixed thoroughly to obtain the modified solution;

[0091] Five parts of zirconium silicate composite material and eight parts of modification liquid were thoroughly mixed, then filtered and dried to obtain the zirconium silicate composite modifier.

[0092] S03: The nanocellulose-based blending liquid and the zirconium silicate-based modifier were ball-milled at a weight ratio of 11:7. After ball milling, the mixture was filtered and dried to obtain the synergist based on the nanocellulose-zirconium silicate co-modification.

[0093] In this embodiment, the mass fraction of the hydrochloric acid dopamine solution is 7%; the ball milling speed in SO3 is 1200 r / min, and the ball milling time is 2 h.

[0094] The preparation method of the doped nano-aluminum nitride modifier in this embodiment is as follows:

[0095] S11: Nano aluminum nitride is stirred thoroughly in a sufficient amount of 10% potassium permanganate solution, and then washed three times with boiling water to obtain pretreated nano aluminum nitride.

[0096] β-cyclodextrin, silane coupling agent KH550 and aqueous ethanol solution were thoroughly mixed at a weight ratio of 3:2:5 to obtain β-cyclodextrin solution.

[0097] S12: According to the weight parts, 3 parts graphene, 2 parts titanium dioxide and 5 parts β-cyclodextrin liquid are mixed thoroughly to obtain graphene liquid; 4 parts pretreated nano aluminum nitride and 5 parts graphene liquid are subjected to ultrasonic treatment. After ultrasonic treatment, nano aluminum nitride-graphene hybrid liquid is obtained.

[0098] S13: Nano-aluminum nitride-graphene hybrid liquid and basalt fiber agent were mixed at a weight ratio of 7:5 and ball-milled at a speed of 1000 r / min for 2 h. After ball milling, the mixture was filtered and dried to obtain a comprehensive conditioning agent doped with nano-aluminum nitride.

[0099] In this embodiment, the mass fraction of the ethanol-water solution is 75%; the ultrasonic power for ultrasonic treatment is 450W, and the ultrasonic treatment lasts for 1 hour.

[0100] The preparation method of the basalt fiber agent in this embodiment is as follows:

[0101] Basalt fibers were preheated at 55°C for 1 hour to obtain preheated basalt fibers. The preheated basalt fibers were then immersed in a treatment solution with a total weight of 5 times the preheated basalt fibers. The immersion ultrasonic power was 350W, and the immersion was carried out for 1 hour. After the immersion was completed, the solution was filtered and dried to obtain basalt fiber agent.

[0102] The treatment solution comprises the following raw materials in parts by weight: 3 parts mica powder, 2 parts quartz powder, 2 parts halloysite nanotubes, and 5 parts sodium dodecyl sulfate solution with a mass fraction of 10%.

[0103] The preparation method of the exterior paint in this embodiment is as follows:

[0104] 120 parts by weight of xylene were added to a reaction vessel and heated to 45°C. Then, 100 parts by weight of epoxy resin with a number average molecular weight of 5000 and a softening point of 145°C were added. The mixture was kept warm and stirred until it cooled to room temperature. Then, 45 parts by weight of 3-methyltetrahydrophthalic anhydride, 2 parts by weight of epoxidized soybean oil, and 0.5 parts by weight of polypropylene ester with a number average molecular weight of 5000 were added and stirred for 2 hours at a stirring speed of 150 r / min. After stirring, the outer paint was obtained.

[0105] Example 2.

[0106] The fabrication process of an ultrathin enamel-coated transposed conductor according to this embodiment includes the following steps:

[0107] Step 1: Using copper wire as the substrate, ultrasonically clean it with anhydrous ethanol for 15 minutes at an ultrasonic power of 400W. After ultrasonic cleaning, dry it at 155℃ until the surface moisture content is less than 0.1%.

[0108] Step 2: Coat the substrate treated in Step 1 with acetal paint to a thickness of 0.02mm, then coat with intermediate modified paint to a thickness of 0.04mm, and finally coat with outer paint to a thickness of 0.03mm.

[0109] Step 3: Process the copper wires processed in Step 2 into transposed conductors to obtain ultra-thin enamel transposed conductors.

[0110] In this embodiment, the coating process uses a drying treatment at a temperature of 500°C for 30 minutes.

[0111] The specific operation method for processing copper wire into transposed conductors is as follows:

[0112] The 87 copper wires from step two are braided into a transposed wire bundle using a transposed wire device. An insulating mesh is then wrapped around the transposed wire bundle using a wrapping device to form an insulating mesh layer with a thickness of 0.28 mm and a wrapping tension of 23 N.

[0113] The intermediate modified paint of this embodiment includes the following raw materials in parts by weight:

[0114] The composition includes 35 parts of epoxy resin E51, 12 parts of synergist based on nanocellulose-zirconium silicate co-modification, 11 parts of comprehensive modifier doped with nano aluminum nitride, 7 parts of curing agent, 5 parts of curing accelerator, 25 parts of ethanol solvent, and 7 parts of silane coupling agent KH560.

[0115] In this embodiment, the curing agent is p-xyleneamine; the curing accelerator is 2-methylimidazole.

[0116] The preparation method of the synergist based on nanocellulose-zirconium silicate co-modification in this embodiment is as follows:

[0117] S01: First, prepare a 15% sodium alginate solution and a 7% sodium silicate solution.

[0118] The following quantities are measured by weight: 8 parts of nanocellulose, 5 parts of lanthanum oxide, 12 parts of sodium alginate solution, and 3 parts of sodium silicate solution are mixed and stirred evenly to obtain a nanocellulose-based blend.

[0119] SO2: Preparation of zirconium silicate-based modifiers:

[0120] S02a: 5 parts zirconium silicate, 4 parts diamond powder, and 3 parts alumina are blended and sintered for 1.5 hours at a sintering temperature of 350°C for 2 hours. After sintering is completed, zirconium silicate composite material is obtained.

[0121] S02b: 4 parts sodium carboxymethyl cellulose, 2 parts nano silica sol, 8 parts dopamine hydrochloride solution and 3 parts citric acid are mixed thoroughly to obtain the modified solution;

[0122] Eight parts of zirconium silicate composite material and eleven parts of modification liquid were thoroughly mixed, then filtered and dried to obtain the zirconium silicate composite modifier.

[0123] S03: The nanocellulose-based blending liquid and the zirconium silicate-based modifier were ball-milled at a weight ratio of 15:7. After ball milling, the mixture was filtered and dried to obtain the synergist based on the nanocellulose-zirconium silicate co-modification.

[0124] In this embodiment, the mass fraction of the hydrochloric acid dopamine solution is 11%; the ball milling speed in SO3 is 1500 r / min, and the ball milling time is 3 h.

[0125] The preparation method of the doped nano-aluminum nitride modifier in this embodiment is as follows:

[0126] S11: Nano aluminum nitride is stirred thoroughly in a sufficient amount of 15% potassium permanganate solution, and then washed 5 times with boiling water to obtain pretreated nano aluminum nitride.

[0127] β-cyclodextrin, silane coupling agent KH550 and aqueous ethanol solution were thoroughly mixed at a weight ratio of 5:2:8 to obtain β-cyclodextrin solution.

[0128] S12: According to the weight parts, 5 parts graphene, 4 parts titanium dioxide and 8 parts β-cyclodextrin liquid are thoroughly mixed to obtain graphene liquid; 7 parts pretreated nano aluminum nitride and 8 parts graphene liquid are subjected to ultrasonic treatment. After the ultrasonic treatment is completed, nano aluminum nitride-graphene hybrid liquid is obtained.

[0129] S13: Nano-aluminum nitride-graphene hybrid liquid and basalt fiber agent were mixed at a weight ratio of 11:5 and ball-milled at a speed of 1500 r / min for 3 h. After ball milling, the mixture was filtered and dried to obtain a nano-aluminum nitride-doped blending agent.

[0130] In this embodiment, the ethanol aqueous solution has a mass fraction of 85%; the ultrasonic power for ultrasonic treatment is 500W, and the ultrasonic treatment lasts for 2 hours.

[0131] The preparation method of the basalt fiber agent in this embodiment is as follows:

[0132] Basalt fibers were preheated at 60°C for 2 hours to obtain preheated basalt fibers. The preheated basalt fibers were then immersed in a treatment solution with a total weight of 8 times the preheated basalt fibers. The immersion ultrasonic power was 400W, and the immersion time was 2 hours. After the immersion was completed, the solution was filtered and dried to obtain basalt fiber agent.

[0133] The treatment solution comprises the following raw materials in parts by weight: 5 parts mica powder, 5 parts quartz powder, 3 parts halloysite nanotubes, and 8 parts sodium dodecyl sulfate solution with a mass fraction of 15%.

[0134] The preparation method of the exterior paint in this embodiment is as follows:

[0135] 130 parts by weight of xylene were added to a reaction vessel and heated to 50°C. Then, 120 parts by weight of epoxy resin with a number average molecular weight of 8000 and a softening point of 150°C were added. The mixture was kept warm and stirred until it cooled to room temperature. Then, 50 parts by weight of 3-methyltetrahydrophthalic anhydride, 3 parts by weight of epoxidized soybean oil, and 0.7 parts by weight of polypropylene ester with a number average molecular weight of 6000 were added and stirred for 2 hours at a stirring speed of 170 r / min. After stirring was completed, the outer paint was obtained.

[0136] Example 3.

[0137] The fabrication process of an ultrathin enamel-coated transposed conductor according to this embodiment includes the following steps:

[0138] Step 1: Using copper wire as the substrate, ultrasonically clean it with anhydrous ethanol for 13.5 minutes at an ultrasonic power of 375W. After ultrasonic cleaning, dry it at 150℃ until the surface moisture content is less than 0.1%.

[0139] Step 2: Coat the substrate treated in Step 1 with acetal paint to a thickness of 0.015mm, then coat with intermediate modified paint to a thickness of 0.035mm, and finally coat with outer paint to a thickness of 0.025mm.

[0140] Step 3: Process the copper wires processed in Step 2 into transposed conductors to obtain ultra-thin enamel transposed conductors.

[0141] In this embodiment, the coating process uses a drying treatment at a temperature of 420°C for 25 minutes.

[0142] The specific operation method for processing copper wire into transposed conductors is as follows:

[0143] The 43 copper wires from step two are braided into a transposed wire bundle using a transposed wire device. An insulating mesh is then wrapped around the transposed wire bundle using a wrapping device to form an insulating mesh layer with a thickness of 0.25 mm and a wrapping tension of 20 N.

[0144] The intermediate modified paint of this embodiment includes the following raw materials in parts by weight:

[0145] The composition includes 32.5 parts of epoxy resin E51, 10 parts of synergist based on nanocellulose-zirconium silicate co-modification, 9 parts of comprehensive modifier doped with nano aluminum nitride, 5.5 parts of curing agent, 4 parts of curing accelerator, 22.5 parts of ethanol solvent, and 5.5 parts of silane coupling agent KH560.

[0146] In this embodiment, the curing agent is p-xyleneamine; the curing accelerator is 2-methylimidazole.

[0147] The preparation method of the synergist based on nanocellulose-zirconium silicate co-modification in this embodiment is as follows:

[0148] S01: First, prepare a sodium alginate solution with a mass fraction of 12.5% ​​and a sodium silicate solution with a mass fraction of 5.5%.

[0149] The following quantities are measured by weight: 6.5 parts of nanocellulose, 3.5 parts of lanthanum oxide, 10 parts of sodium alginate solution, and 2 parts of sodium silicate solution are mixed and stirred evenly to obtain a nanocellulose-based blend.

[0150] SO2: Preparation of zirconium silicate-based modifiers:

[0151] S02a: 4 parts zirconium silicate, 3 parts diamond powder, and 2 parts alumina are blended and sintered for 1.25 h at a sintering temperature of 325℃ for 1.5 h. After sintering is completed, zirconium silicate composite material is obtained.

[0152] S02b: 3 parts sodium carboxymethyl cellulose, 1.5 parts nano silica sol, 6.5 parts dopamine hydrochloride solution, and 2.5 parts citric acid are thoroughly mixed to obtain the modified solution;

[0153] 6.5 parts of zirconium silicate composite material and 9 parts of modification liquid were thoroughly mixed, then filtered and dried to obtain the zirconium silicate composite modifier.

[0154] S03: The nanocellulose-based blending liquid and the zirconium silicate-based modifier were ball-milled at a weight ratio of 13:7. After ball milling, the mixture was filtered and dried to obtain the synergist based on the nanocellulose-zirconium silicate co-modification.

[0155] In this embodiment, the mass fraction of the hydrochloric acid dopamine solution is 9%; the ball milling speed in SO3 is 1350 r / min, and the ball milling time is 2.5 h.

[0156] The preparation method of the doped nano-aluminum nitride modifier in this embodiment is as follows:

[0157] S11: Nano aluminum nitride is stirred thoroughly in a sufficient amount of potassium permanganate solution with a mass fraction of 12.5%, and then washed 4 times with boiling water to obtain pretreated nano aluminum nitride.

[0158] β-cyclodextrin, silane coupling agent KH550 and ethanol aqueous solution were mixed thoroughly at a weight ratio of 4:2:(5-8) to obtain β-cyclodextrin solution;

[0159] S12: According to the weight parts, 4 parts graphene, 3 parts titanium dioxide and 6.5 parts β-cyclodextrin solution are thoroughly mixed to obtain graphene solution; 5.5 parts pretreated nano aluminum nitride and 6.5 parts graphene solution are subjected to ultrasonic treatment. After ultrasonic treatment, nano aluminum nitride-graphene hybrid solution is obtained.

[0160] S13: Nano-aluminum nitride-graphene hybrid liquid and basalt fiber agent were mixed at a weight ratio of 9:5 and ball-milled at a speed of 1250 r / min for 2.5 h. After ball milling, the mixture was filtered and dried to obtain a general conditioning agent doped with nano-aluminum nitride.

[0161] In this embodiment, the ethanol-water solution has a mass fraction of 80%; the ultrasonic power for ultrasonic treatment is 475W, and the ultrasonic treatment lasts for 1.5 hours.

[0162] The preparation method of the basalt fiber agent in this embodiment is as follows:

[0163] Basalt fibers were preheated at 58°C for 1.5 hours to obtain preheated basalt fibers. The preheated basalt fibers were then immersed in a treatment solution with a total weight of 6.5 times the preheated basalt fibers. The immersion ultrasonic power was 375W, and the immersion time was 1.5 hours. After the immersion was completed, the solution was filtered and dried to obtain basalt fiber agent.

[0164] The treatment solution comprises the following raw materials in parts by weight: 4 parts mica powder, 3.5 parts quartz powder, 2.5 parts halloysite nanotubes, and 6.5 parts sodium dodecyl sulfate solution with a mass fraction of 12.5%.

[0165] The preparation method of the exterior paint in this embodiment is as follows:

[0166] 125 parts by weight of xylene were added to a reaction vessel and heated to 47.5°C. Then, 110 parts by weight of epoxy resin with a number average molecular weight of 7000 and a softening point of 148°C were added. The mixture was kept warm and stirred until it cooled to room temperature. Then, 47.5 parts by weight of 3-methyltetrahydrophthalic anhydride, 2.5 parts by weight of epoxidized soybean oil, and 0.6 parts by weight of polypropylene ester with a number average molecular weight of 5500 were added and stirred for 2 hours at a stirring speed of 160 r / min. After stirring, the outer paint was obtained.

[0167] Comparative Example 1

[0168] Unlike Example 3, no additives based on nanocellulose-zirconium silicate co-modification were added in the preparation of the intermediate modified paint.

[0169] Comparative Example 2

[0170] Unlike Example 3, no zirconium silicate modifier was added in the preparation of the synergist based on nanocellulose-zirconium silicate co-modification.

[0171] Comparative Example 3

[0172] Unlike Example 3, no zirconium silicate composite material was added in the preparation of the zirconium silicate composite modifier.

[0173] Comparative Example 4

[0174] Unlike Example 3, no diamond powder or alumina was added to the zirconium silicate composite.

[0175] Comparative Example 5

[0176] Unlike Example 3, no nanocellulose-based blending solution was added in the preparation of the synergist based on nanocellulose-zirconium silicate co-modification.

[0177] Comparative Example 6

[0178] Unlike Example 3, no nanocellulose or lanthanum oxide was added to the blended solution based on nanocellulose.

[0179] Comparative Example 7

[0180] Unlike Example 3, no nano-aluminum nitride modifier was added.

[0181] Comparative Example 8

[0182] Unlike Example 3, the nano-aluminum nitride-graphene hybrid solution was not added in the preparation of the conditioning agent.

[0183] Comparative Example 9

[0184] Unlike Example 3, no pretreated aluminum nitride was added in the preparation of the nano-aluminum nitride-graphene hybrid liquid.

[0185] Comparative Example 10

[0186] Unlike Example 3, in the preparation of the nano-aluminum nitride-graphene hybrid liquid, no graphene or titanium dioxide was added to the graphene liquid.

[0187] Comparative Example 11

[0188] Unlike Example 3, in the preparation of the nano-aluminum nitride-graphene hybrid solution, the β-cyclodextrin solution was replaced with an ethanol solution with a mass fraction of 80%.

[0189] Comparative Example 12

[0190] Unlike Example 3, basalt fiber agent was not added in the preparation of the conditioning agent doped with nano-aluminum nitride.

[0191] Examples 1-3 and Comparative Examples 1-12 were tested for electrical performance, thermal conductivity, salt spray resistance (5% sodium chloride salt spray), high temperature resistance (500℃), impact resistance, and water resistance. The performance test results are shown in Table 1 below. Table 1 is a table of comprehensive performance test results for the products.

[0192] Table 1:

[0193]

[0194] From Examples 1-3 and Comparative Examples 1-12, it can be seen that the insulation resistance coefficient of Example 3 of the present invention can reach a maximum of 527.5 Ω / cm. The impact strength can reach 68cm, the thermal conductivity can reach 0.799W / (mK), the water contact angle can reach 148 degrees, the salt spray resistance time can reach up to 1161h, and the high temperature resistance time can reach up to 1057h. The product has excellent electrical performance, thermal conductivity, salt spray resistance, high temperature resistance, impact resistance and waterproof performance. The overall performance of the product can be improved in a coordinated manner.

[0195] As can be seen from Comparative Examples 1-12 and Example 3, the performance of the intermediate modified paint is significantly worse when neither of the following additives is added: the additive based on nanocellulose-zirconium silicate co-modification nor the additive is added: the additive based on nano-aluminum nitride. Only when the two are combined and work together can the performance of the product be most significant.

[0196] In the preparation of synergists based on nanocellulose-zirconium silicate co-modification, no zirconium silicate modifier is added; no zirconium silicate composite material is added in the preparation of the zirconium silicate composite material; no diamond powder or alumina is added in the zirconium silicate composite material; no nanocellulose-based blending liquid is added in the preparation of synergists based on nanocellulose-zirconium silicate co-modification; and no nanocellulose or lanthanum oxide is added in the blending liquid based on nanocellulose. The performance of the products in these synergists tends to deteriorate to varying degrees. The synergist based on nanocellulose-zirconium silicate co-modification prepared by the specific method of this invention, using a blending liquid based on nanocellulose and a zirconium silicate co-modifier in a coordinated manner, exhibits the most significant performance effect. Other methods used as substitutes are not as effective as those of this invention.

[0197] In the preparation of the comprehensive conditioning agent doped with nano-aluminum nitride, no nano-aluminum nitride-graphene hybrid liquid was added; in the preparation of the nano-aluminum nitride-graphene hybrid liquid, no pretreated nano-aluminum nitride was added; in the preparation of the nano-aluminum nitride-graphene hybrid liquid, no graphene or titanium dioxide was added to the graphene liquid; in the preparation of the nano-aluminum nitride-graphene hybrid liquid, β-cyclodextrin liquid was replaced with an 80% ethanol solution; and no basalt fiber agent was added in the preparation of the comprehensive conditioning agent doped with nano-aluminum nitride. The performance of the products all showed a trend of deterioration to varying degrees.

[0198] Simultaneously, the preparation of the nano-aluminum nitride-doped conditioning agent did not include basalt fiber agent, resulting in a large performance variation trend of the product. Furthermore, the preparation of the nano-aluminum nitride-graphene hybrid liquid is proprietary. The nano-aluminum nitride-doped conditioning agent obtained by the specific method of this invention exhibits the most significant performance effect.

[0199] This invention further explores the performance of the product using basalt fiber agents;

[0200] Experimental Example 1

[0201] Same as Example 3, except that no treatment liquid was added to the basalt fiber agent.

[0202] Experiment Example 2

[0203] Same as Example 3, except that mica powder was not added to the treatment solution.

[0204] Experimental Example 3

[0205] Same as Example 3, except that quartz powder was not added to the treatment solution.

[0206] Experiment Example 4

[0207] Same as Example 3, except that halloysite nanotubes were not added to the treatment solution.

[0208] Experimental Example 5

[0209] Same as Example 3, except that no basalt fiber was added to the basalt fiber agent.

[0210] The present invention conducted further performance tests on the products of Experimental Examples 1-5. The performance tests are shown in Table 2 below. Table 2 shows the effect of basalt fiber agent on the performance of the products.

[0211] Table 2:

[0212]

[0213] As can be seen from Experiments 1-5, the absence of treatment solution in basalt fiber agent and the absence of basalt fiber in basalt fiber agent resulted in the most significant deterioration in product performance among the factors affecting the preparation of basalt fiber agent. The absence of mica powder, quartz powder, and halloysite nanotubes in the treatment solution also led to a deterioration in product performance. Only the treatment solution prepared using the specific method of this invention, combined with basalt fiber, resulted in the most significant performance improvement in the specific basalt fiber agent. In the preparation of basalt fiber agent, all raw materials are indispensable. Only by using the specific raw material ratio of this invention can the effect be as significant as that of this invention. Using other raw material ratios does not yield the same results as this invention.

[0214] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0215] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A process for preparing an ultrathin transposed conductor with an enameled film, characterized in that, Includes the following steps: Step 1: Using copper wire as the substrate, ultrasonically clean it with anhydrous ethanol for 12-15 minutes at an ultrasonic power of 350-400W. After ultrasonic cleaning, dry it at 145-155℃ until the surface moisture content is less than 0.1%. Step 2: Coat the substrate treated in Step 1 with acetal paint with a thickness of 0.01-0.02mm, then coat with intermediate modified paint with a thickness of 0.03-0.04mm, and finally coat with outer paint with a thickness of 0.02-0.03mm. Step 3: Process the copper wires treated in Step 2 into transposed conductors to obtain ultra-thin enamel transposed conductors; The intermediate modified paint comprises the following raw materials in parts by weight: Epoxy resin E51 30-35 parts, synergist based on nanocellulose-zirconium silicate co-modification 8-12 parts, modifier doped with nano aluminum nitride 7-11 parts, curing agent 4-7 parts, curing accelerator 3-5 parts, ethanol solvent 20-25 parts and silane coupling agent KH560 4-7 parts. The preparation method of the synergist based on nanocellulose-zirconium silicate co-modification is as follows: S01: First, prepare a sodium alginate solution with a mass fraction of 10-15% and a sodium silicate solution with a mass fraction of 4-7%. The following quantities are measured by weight: 5-8 parts of nanocellulose, 2-5 parts of lanthanum oxide, 8-12 parts of sodium alginate solution, and 1-3 parts of sodium silicate solution are mixed and stirred evenly to obtain a nanocellulose-based blend. SO2: Preparation of zirconium silicate-based modifiers: S02a: 3-5 parts zirconium silicate, 2-4 parts diamond powder, and 1-3 parts alumina are blended and sintered for 1-1.5 hours at a sintering temperature of 300-350℃ for 1-2 hours. After sintering, zirconium silicate composite material is obtained. S02b: Mix 2-4 parts of sodium carboxymethyl cellulose, 1-2 parts of nano silica sol, 5-8 parts of dopamine hydrochloride solution and 2-3 parts of citric acid thoroughly to obtain the modified solution; Mix 5-8 parts of zirconium silicate composite material and 8-11 parts of modification liquid thoroughly, then filter and dry to obtain zirconium silicate composite modifier; S03: The nanocellulose-based blending liquid and the zirconium silicate-based modifier were ball-milled at a weight ratio of (11-15):

7. After ball milling, the mixture was filtered and dried to obtain the synergist based on nanocellulose-zirconium silicate co-modification. The preparation method of the doped nano-aluminum nitride modifier is as follows: S11: Stir the nano-aluminum nitride thoroughly in a sufficient amount of potassium permanganate solution with a mass fraction of 10-15%, and then wash it with boiling water 3-5 times to obtain pretreated nano-aluminum nitride. β-cyclodextrin, silane coupling agent KH550 and ethanol aqueous solution were mixed thoroughly at a weight ratio of (3-5):2:(5-8) to obtain β-cyclodextrin solution; S12: According to the weight parts, 3-5 parts of graphene, 2-4 parts of titanium dioxide and 5-8 parts of β-cyclodextrin solution are thoroughly mixed to obtain graphene solution; 4-7 parts of pretreated nano-aluminum nitride and 5-8 parts of graphene solution are subjected to ultrasonic treatment. After the ultrasonic treatment is completed, nano-aluminum nitride-graphene hybrid solution is obtained. S13: Nano-aluminum nitride-graphene hybrid liquid and basalt fiber agent are mixed at a weight ratio of (7-11):5 and ball-milled at a speed of 1000-1500 r / min for 2-3 h. After ball milling, the mixture is filtered and dried to obtain a nano-aluminum nitride-doped blending agent.

2. The fabrication process of an ultrathin transposed conductor according to claim 1, characterized in that, All coating processes employ drying treatment, with a drying temperature of 180-500℃ and a drying time of 20-30 minutes. The specific operation method for processing copper wire into transposed conductors is as follows: 5-87 copper wires from step two are braided into a transposed wire bundle using a transposed wire device. An insulating mesh is then wrapped around the transposed wire bundle using a wrapping device to form an insulating mesh layer. The thickness of the insulating mesh layer is 0.23-0.28 mm, and the wrapping tension of the insulating mesh is controlled at 15-23 N.

3. The fabrication process of an ultrathin transposed conductor according to claim 1, characterized in that, The curing agent is p-xyleneamine; the curing accelerator is 2-methylimidazole.

4. The fabrication process of an ultrathin transposed conductor according to claim 3, characterized in that, The mass fraction of the hydrochloric acid dopamine solution is 7-11%; the ball milling speed in SO3 is 1200-1500 r / min, and the ball milling time is 2-3 h.

5. The fabrication process of an ultrathin transposed conductor according to claim 1, characterized in that, The mass fraction of the ethanol-water solution is 75-85%; the ultrasonic power for ultrasonic treatment is 450-500W, and the ultrasonic treatment lasts for 1-2 hours.

6. The fabrication process of an ultrathin transposed conductor according to claim 1, characterized in that, The preparation method of the basalt fiber agent is as follows: Basalt fibers are preheated at 55-60℃ for 1-2 hours to obtain preheated basalt fibers. The preheated basalt fibers are then immersed in a treatment solution with a weight of 5-8 times the total weight of the preheated basalt fibers. The immersion ultrasonic power is 350-400W, and the immersion time is 1-2 hours. After immersion, the solution is filtered and dried to obtain basalt fiber agent. The treatment solution comprises the following raw materials in parts by weight: 3-5 parts mica powder, 2-5 parts quartz powder, 2-3 parts halloysite nanotubes, and 5-8 parts sodium dodecyl sulfate solution with a mass fraction of 10-15%.

7. The fabrication process of an ultrathin transposed conductor according to claim 1, characterized in that, The preparation method of the external paint is as follows: Add 120-130 parts by weight of xylene to a reaction vessel, heat to 45-50℃, then add 100-120 parts by weight of epoxy resin with a number average molecular weight of 5000-8000 and a softening point of 145-150℃, keep warm and stir, cool to room temperature, then add 45-50 parts by weight of 3-methyltetrahydrophthalic anhydride, 2-3 parts by weight of epoxidized soybean oil and 0.5-0.7 parts by weight of polypropylene ester with a number average molecular weight of 5000-6000 and stir to react for 2 hours at a stirring speed of 150-170 r / min. After stirring is finished, the outer paint is obtained.

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