An insulating layer for electromagnetic wires and its preparation process

Abstract

This invention relates to the field of electromagnetic wire insulation technology, specifically to an insulation layer for electromagnetic wire and its preparation process, comprising the following steps: coating the electromagnetic wire with an insulating modified varnish using an enameling machine, followed by baking in the enameling machine to complete the preparation of the insulation layer. The insulation layer for electromagnetic wire of this invention uses an enameling machine to coat with an insulating modified varnish. The insulating modified varnish is composed of polyimide varnish, xylene solvent, weather-resistant functional agents, and modified fillers. Through the co-combination and synergistic effect of the raw materials, the resulting insulating modified varnish optimizes the softening breakdown properties, abrasion resistance, and stain resistance of the insulation layer within the system. The performance coordination of the product is improved, and the product's weather resistance and temperature change stability are significantly enhanced.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic wire insulation layer technology, specifically to an insulation layer for electromagnetic wires and its preparation process. Background Technology

[0002] Electromagnetic wire, also known as winding wire, is an insulated wire used to manufacture coils or windings in electrical products. Electromagnetic wire is generally classified into enameled wire, wrapped wire, enameled and wrapped wire, and inorganic insulated wire. Electromagnetic wire can be classified according to its basic composition, conductive core, and electrical insulation layer. It is typically categorized based on the insulating material used and the manufacturing method of the electrical insulation layer.

[0003] The process for preparing the insulating coating layer used for electromagnetic wire is relatively simple, resulting in poor resistance to softening and breakdown. At the same time, the insulation layer has poor abrasion resistance and dirt resistance, leading to unsatisfactory performance coordination of the product. Furthermore, the product has poor weather resistance and temperature change stability, which limits the product's efficiency. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the purpose of this invention is to provide an insulating layer for electromagnetic wires and its preparation process, so as to solve the problems mentioned in the background art.

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

[0006] This invention provides a process for preparing an insulating layer for electromagnetic wires, comprising the following steps:

[0007] The insulation layer is prepared by coating the electromagnetic wire with insulating varnish using an enameling machine and then baking it in the enameling machine.

[0008] The insulating improver varnish includes the following raw materials in parts by weight:

[0009] 50-60 parts polyimide paint, 35-40 parts xylene solvent, 7-11 parts weather-resistant functional agent, and 4-7 parts modified filler.

[0010] Preferably, the baking conditions for the enameling machine are: a baking temperature of 180-500℃ and a machine speed of 5-18m / min.

[0011] The thickness of the insulation layer is 0.8-0.9 mm;

[0012] The polyimide paint is prepared by first mixing pyromellitic dianhydride and p-phenylenediamine to obtain a product body. The product body and N,N-dimethylacetamide are then stirred at 8-10°C for 1 hour until the solution viscosity is constant, resulting in a polyimide paint body with a solid content of 15%.

[0013] The molar ratio of pyromellitic dianhydride to p-phenylenediamine is (1.04-1.06):1; the volume ratio of the product to N,N-dimethylacetamide is 1:(1.1-1.3).

[0014] Preferably, the preparation method of the weather-resistant functional agent is as follows:

[0015] S1, Preparation of the modified compounding agent:

[0016] S2, Silane coupling agent KH560, deionized water and ethanol are mixed evenly in a weight ratio of 3:5:8 to obtain silane coupling solution;

[0017] 4-6 parts by weight of strontium titanate, 5-8 parts by weight of mullite, 2-3 parts by weight of bentonite, and 10-15 parts by weight of silane coupling solution were blended and ultrasonically treated. After ultrasonic treatment, a silane-coupled composite was obtained.

[0018] S3, silicon nitride is first irradiated in a proton irradiation chamber for 1 hour at an irradiation power of 350-400W. After irradiation, irradiated silicon nitride is obtained.

[0019] Irradiated silicon nitride and modified compounding agent were ball-milled at a weight ratio of 5:(2-3) for the first conditioning treatment. After ball milling, the mixture was filtered and dried to obtain the first-conditioned ball mill body.

[0020] S4, the first-conditioned ball milling media and the silane-coupled composite are ball milled for the second conditioning treatment. After ball milling, the mixture is filtered and dried to obtain the weather-resistant functional agent.

[0021] Preferably, the ultrasonic power of the blending ultrasonic treatment is 450-500W, and the ultrasonic treatment lasts for 1 hour.

[0022] Preferably, the ball milling speed for the first conditioning treatment is 1050-1150 r / min, and the ball milling time is 2 h; the ball milling speed for the second conditioning treatment is 1500-1700 r / min, and the ball milling time is 1 h.

[0023] Preferably, the modified compounding agent is prepared by:

[0024] S1a: Carboxymethyl cellulose and barium zirconate are mixed at a weight ratio of 2:5 to obtain a homogeneous mixture. The homogeneous mixture is then added to sodium silicate solution at a weight ratio of 3:5 and stirred until homogeneous to obtain carboxymethyl cellulose solution.

[0025] S1b: Add 3-5 parts by weight of nano-magnesium carbonate and 2-3 parts by weight of boron oxide to 4-7 parts of carboxymethyl cellulose solution, stir thoroughly, and obtain the modified compounding agent.

[0026] The weather-resistant functional agent is made by proton irradiation of silicon nitride to activate its activity. Then, it is subjected to ball milling and first conditioning treatment with a modified compounding agent. The modified compounding agent is blended with nano-magnesium carbonate and boron oxide in combination with carboxymethyl cellulose solution. At the same time, carboxymethyl cellulose and barium zirconate in the carboxymethyl cellulose solution are further synergistically combined with sodium silicate solution. Through the co-coordination and mutual optimization of the raw materials, the modified compounding agent is further optimized with silicon nitride by the blending and combination of raw materials, thereby enhancing the performance coordination and weather resistance and temperature change stability of the system.

[0027] Furthermore, the silane-coupled composite is ball-milled and then subjected to a second conditioning treatment. The silane-coupled composite is ultrasonically treated by blending strontium titanate, mullite, and bentonite with a silane coupling liquid. By optimizing the silane coupling liquid, the interfacial properties between the raw materials in the system are enhanced. At the same time, the use of strontium titanate, mullite, and bentonite to blend and coordinate the components further enhances the performance coordination and stability of the system.

[0028] Preferably, the sodium silicate solution has a mass fraction of 5-8%.

[0029] Preferably, the modified filler is prepared by:

[0030] S11, add 2-3 parts by weight of nano titanium dioxide, 3-5 parts by weight of boron nitride and 1-2 parts by weight of nano silica sol to 8-12 parts by weight of sodium hexametaphosphate solution and stir evenly to obtain a functional dispersion;

[0031] S12, 5-8 parts by weight of cordierite, 3-5 parts by weight of basalt fiber and 2-4 parts by weight of calcined talc are blended and sintered to obtain a filler additive;

[0032] The filler and functional dispersion were ultrasonically treated at a weight ratio of 3:5 with an ultrasonic power of 350-400W for 1 hour. After ultrasonication, the mixture was filtered and dried to obtain the modified filler.

[0033] Preferably, the sodium hexametaphosphate solution has a mass fraction of 5-8%.

[0034] The modified filler agent is made by dispersing nano-titanium oxide and boron nitride with nano-silica sol using sodium hexametaphosphate solution. The added filler additives are made by sintering cordierite and basalt fiber with calcined talc. Through the coordination of the raw materials, the self-cleaning point can be improved and the anti-fouling properties of the product can be optimized. At the same time, by combining boron nitride and other raw materials with cordierite and basalt fiber, the modified filler agent and weather-resistant functional agent have a better synergistic reinforcement effect, thus further improving the performance of the product.

[0035] Preferably, the sintering temperature of the blending sintering treatment is 200-220℃, and the sintering time is 1 hour.

[0036] The present invention also provides a process for preparing an insulating layer for electromagnetic wires.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The insulation layer of the electromagnetic wire of this invention is coated with an improved insulation varnish using an enameling machine. The improved insulation varnish is made of polyimide varnish, xylene solvent, weather-resistant functional agent, and modified filler. Through the co-mixing and synergistic effect of the raw materials, the improved insulation varnish optimizes the softening and breakdown properties, abrasion resistance, and stain resistance of the insulation layer in the system. The performance coordination of the product is improved, and the weather resistance and temperature change stability of the product are significantly enhanced.

[0039] 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.

[0040] This embodiment describes a process for preparing an insulating layer for electromagnetic wires, including the following steps:

[0041] The insulation layer is prepared by coating the electromagnetic wire with insulating varnish using an enameling machine and then baking it in the enameling machine.

[0042] The insulating improver varnish includes the following raw materials in parts by weight:

[0043] 50-60 parts polyimide paint, 35-40 parts xylene solvent, 7-11 parts weather-resistant functional agent, and 4-7 parts modified filler.

[0044] The baking conditions for the enameling machine are: a baking temperature of 180-500℃ and a machine speed of 5-18m / min.

[0045] The thickness of the insulation layer is 0.8-0.9 mm;

[0046] The polyimide paint is prepared by first mixing pyromellitic dianhydride and p-phenylenediamine to obtain a product body. The product body and N,N-dimethylacetamide are then stirred at 8-10°C for 1 hour until the solution viscosity is constant, resulting in a polyimide paint body with a solid content of 15%.

[0047] The molar ratio of pyromellitic dianhydride to p-phenylenediamine is (1.04-1.06):1; the volume ratio of the product to N,N-dimethylacetamide is 1:(1.1-1.3).

[0048] The preparation method of the weather-resistant functional agent in this embodiment is as follows:

[0049] S1, Preparation of the modified compounding agent:

[0050] S2, Silane coupling agent KH560, deionized water and ethanol are mixed evenly in a weight ratio of 3:5:8 to obtain silane coupling solution;

[0051] 4-6 parts by weight of strontium titanate, 5-8 parts by weight of mullite, 2-3 parts by weight of bentonite, and 10-15 parts by weight of silane coupling solution were blended and ultrasonically treated. After ultrasonic treatment, a silane-coupled composite was obtained.

[0052] S3, silicon nitride is first irradiated in a proton irradiation chamber for 1 hour at an irradiation power of 350-400W. After irradiation, irradiated silicon nitride is obtained.

[0053] Irradiated silicon nitride and modified compounding agent were ball-milled at a weight ratio of 5:(2-3) for the first conditioning treatment. After ball milling, the mixture was filtered and dried to obtain the first-conditioned ball mill body.

[0054] S4, the first-conditioned ball milling media and the silane-coupled composite are ball milled for the second conditioning treatment. After ball milling, the mixture is filtered and dried to obtain the weather-resistant functional agent.

[0055] In this embodiment, the ultrasonic power for the blending ultrasonic treatment is 450-500W, and the ultrasonic treatment lasts for 1 hour.

[0056] In this embodiment, the ball milling speed for the first conditioning treatment is 1050-1150 r / min, and the ball milling time is 2 hours; the ball milling speed for the second conditioning treatment is 1500-1700 r / min, and the ball milling time is 1 hour.

[0057] The preparation method of the modified compounding agent in this embodiment is as follows:

[0058] S1a: Carboxymethyl cellulose and barium zirconate are mixed at a weight ratio of 2:5 to obtain a homogeneous mixture. The homogeneous mixture is then added to sodium silicate solution at a weight ratio of 3:5 and stirred until homogeneous to obtain carboxymethyl cellulose solution.

[0059] S1b: Add 3-5 parts by weight of nano-magnesium carbonate and 2-3 parts by weight of boron oxide to 4-7 parts of carboxymethyl cellulose solution, stir thoroughly, and obtain the modified compounding agent.

[0060] The sodium silicate solution in this embodiment has a mass fraction of 5-8%.

[0061] The preparation method of the modified filler in this embodiment is as follows:

[0062] S11, add 2-3 parts by weight of nano titanium dioxide, 3-5 parts by weight of boron nitride and 1-2 parts by weight of nano silica sol to 8-12 parts by weight of sodium hexametaphosphate solution and stir evenly to obtain a functional dispersion;

[0063] S12, 5-8 parts by weight of cordierite, 3-5 parts by weight of basalt fiber and 2-4 parts by weight of calcined talc are blended and sintered to obtain a filler additive;

[0064] The filler and functional dispersion were ultrasonically treated at a weight ratio of 3:5 with an ultrasonic power of 350-400W for 1 hour. After ultrasonication, the mixture was filtered and dried to obtain the modified filler.

[0065] The sodium hexametaphosphate solution in this embodiment has a mass fraction of 5-8%.

[0066] In this embodiment, the sintering temperature for the blending sintering process is 200-220℃, and the sintering time is 1 hour.

[0067] This embodiment describes a method for preparing an insulating layer for electromagnetic wires.

[0068] Example 1

[0069] This embodiment describes a process for preparing an insulating layer for electromagnetic wires, including the following steps:

[0070] The insulation layer is prepared by coating the electromagnetic wire with insulating varnish using an enameling machine and then baking it in the enameling machine.

[0071] The insulating improver varnish includes the following raw materials in parts by weight:

[0072] 60 parts polyimide paint, 40 parts xylene solvent, 11 parts weather-resistant functional agent, and 7 parts modified filler.

[0073] The baking conditions for the enameling machine are: baking temperature of 180℃ and machine speed of 5m / min;

[0074] The thickness of the insulation layer is 0.9 mm;

[0075] The polyimide paint is prepared by first mixing pyromellitic dianhydride and p-phenylenediamine to obtain a product body. The product body and N,N-dimethylacetamide are then stirred at 8°C for 1 hour until the solution viscosity is constant, resulting in a polyimide paint body with a solid content of 15%.

[0076] The molar ratio of pyromellitic dianhydride to p-phenylenediamine is 1.04:1; the volume ratio of the product to N,N-dimethylacetamide is 1:1.1.

[0077] The preparation method of the weather-resistant functional agent in this embodiment is as follows:

[0078] S1, Preparation of the modified compounding agent:

[0079] S2, Silane coupling agent KH560, deionized water and ethanol are mixed evenly in a weight ratio of 3:5:8 to obtain silane coupling solution;

[0080] Four parts by weight of strontium titanate, five parts by weight of mullite, two parts by weight of bentonite, and ten parts by weight of silane coupling liquid were blended and ultrasonically treated. After ultrasonic treatment, a silane-coupled composite was obtained.

[0081] S3, silicon nitride is first irradiated in a proton irradiation chamber for 1 hour at an irradiation power of 350W. After irradiation, irradiated silicon nitride is obtained.

[0082] Irradiated silicon nitride and modified compounding agent were ball-milled at a weight ratio of 5:2 for the first conditioning treatment. After ball milling, the mixture was filtered and dried to obtain the first-conditioned ball mill body.

[0083] S4, the first-conditioned ball milling media and the silane-coupled composite are ball milled for the second conditioning treatment. After ball milling, the mixture is filtered and dried to obtain the weather-resistant functional agent.

[0084] In this embodiment, the ultrasonic power for the blending ultrasonic treatment is 450W, and the ultrasonic treatment lasts for 1 hour.

[0085] In this embodiment, the ball milling speed for the first conditioning treatment is 1050 r / min, and the ball milling time is 2 hours; the ball milling speed for the second conditioning treatment is 1500 r / min, and the ball milling time is 1 hour.

[0086] The preparation method of the modified compounding agent in this embodiment is as follows:

[0087] S1a: Carboxymethyl cellulose and barium zirconate are mixed at a weight ratio of 2:5 to obtain a homogeneous mixture. The homogeneous mixture is then added to sodium silicate solution at a weight ratio of 3:5 and stirred until homogeneous to obtain carboxymethyl cellulose solution.

[0088] S1b: Add 3 parts by weight of nano-magnesium carbonate and 2 parts by weight of boron oxide to 4 parts by weight of carboxymethyl cellulose solution, stir thoroughly, and obtain the modified compounding agent.

[0089] The sodium silicate solution in this embodiment has a mass fraction of 5%.

[0090] The preparation method of the modified filler in this embodiment is as follows:

[0091] S11, add 2 parts by weight of nano titanium dioxide, 3 parts by weight of boron nitride and 1 part by weight of nano silica sol to 8 parts by weight of sodium hexametaphosphate solution and stir evenly to obtain a functional dispersion.

[0092] S12, 5 parts by weight of cordierite, 3 parts by weight of basalt fiber and 2 parts by weight of calcined talc are blended and sintered to obtain a filler additive;

[0093] The filler and functional dispersion were ultrasonically treated at a weight ratio of 3:5 with an ultrasonic power of 350W for 1 hour. After ultrasonication, the mixture was filtered and dried to obtain the modified filler.

[0094] The sodium hexametaphosphate solution in this embodiment has a mass fraction of 5%.

[0095] In this embodiment, the sintering temperature for the blending sintering process is 200°C, and the sintering time is 1 hour.

[0096] This embodiment describes a method for preparing an insulating layer for electromagnetic wires.

[0097] Example 2

[0098] This embodiment describes a process for preparing an insulating layer for electromagnetic wires, including the following steps:

[0099] The insulation layer is prepared by coating the electromagnetic wire with insulating varnish using an enameling machine and then baking it in the enameling machine.

[0100] The insulating improver varnish includes the following raw materials in parts by weight:

[0101] 50 parts polyimide paint, 35 parts xylene solvent, 7 parts weather-resistant functional agent, and 4 parts modified filler.

[0102] The baking conditions for the enameling machine are: baking temperature of 500℃ and machine speed of 18m / min;

[0103] The thickness of the insulation layer is 0.8 mm;

[0104] The polyimide paint is prepared by first mixing pyromellitic dianhydride and p-phenylenediamine to obtain a product body. The product body and N,N-dimethylacetamide are then stirred at 10°C for 1 hour. Once the viscosity of the solution is constant, a polyimide paint body with a solid content of 15% is obtained.

[0105] The molar ratio of pyromellitic dianhydride to p-phenylenediamine is 1.06:1; the volume ratio of the product to N,N-dimethylacetamide is 1:1.3.

[0106] The preparation method of the weather-resistant functional agent in this embodiment is as follows:

[0107] S1, Preparation of the modified compounding agent:

[0108] S2, Silane coupling agent KH560, deionized water and ethanol are mixed evenly in a weight ratio of 3:5:8 to obtain silane coupling solution;

[0109] Six parts by weight of strontium titanate, eight parts by weight of mullite, three parts by weight of bentonite, and 15 parts by weight of silane coupling liquid were blended and ultrasonically treated. After ultrasonic treatment, a silane-coupled composite was obtained.

[0110] S3, silicon nitride is first irradiated in a proton irradiation chamber for 1 hour at an irradiation power of 400W. After irradiation, irradiated silicon nitride is obtained.

[0111] Irradiated silicon nitride and modified compounding agent were ball-milled at a weight ratio of 5:3 for the first conditioning treatment. After ball milling, the mixture was filtered and dried to obtain the first-conditioned ball mill body.

[0112] S4, the first-conditioned ball milling media and the silane-coupled composite are ball milled for the second conditioning treatment. After ball milling, the mixture is filtered and dried to obtain the weather-resistant functional agent.

[0113] In this embodiment, the ultrasonic power for the blending ultrasonic treatment is 500W, and the ultrasonic treatment lasts for 1 hour.

[0114] In this embodiment, the ball milling speed for the first conditioning treatment is 1150 r / min, and the ball milling time is 2 hours; the ball milling speed for the second conditioning treatment is 1700 r / min, and the ball milling time is 1 hour.

[0115] The preparation method of the modified compounding agent in this embodiment is as follows:

[0116] S1a: Carboxymethyl cellulose and barium zirconate are mixed at a weight ratio of 2:5 to obtain a homogeneous mixture. The homogeneous mixture is then added to sodium silicate solution at a weight ratio of 3:5 and stirred until homogeneous to obtain carboxymethyl cellulose solution.

[0117] S1b: 5 parts by weight of nano-magnesium carbonate and 3 parts by weight of boron oxide were mixed and added to 7 parts by weight of carboxymethyl cellulose solution, and stirred thoroughly to obtain the modified compounding agent.

[0118] The sodium silicate solution in this embodiment has a mass fraction of 8%.

[0119] The preparation method of the modified filler in this embodiment is as follows:

[0120] S11, add 3 parts by weight of nano titanium dioxide, 5 parts by weight of boron nitride and 2 parts by weight of nano silica sol to 12 parts by weight of sodium hexametaphosphate solution and stir evenly to obtain a functional dispersion.

[0121] S12, 8 parts by weight of cordierite, 5 parts by weight of basalt fiber and 4 parts by weight of calcined talc are blended and sintered to obtain a filler additive;

[0122] The filler and functional dispersion were ultrasonically treated at a weight ratio of 3:5 with an ultrasonic power of 400W for 1 hour. After ultrasonication, the mixture was filtered and dried to obtain the modified filler.

[0123] The sodium hexametaphosphate solution in this embodiment has a mass fraction of 8%.

[0124] In this embodiment, the sintering temperature for the blending sintering process is 220°C, and the sintering time is 1 hour.

[0125] This embodiment describes a method for preparing an insulating layer for electromagnetic wires.

[0126] Example 3

[0127] This embodiment describes a process for preparing an insulating layer for electromagnetic wires, including the following steps:

[0128] The insulation layer is prepared by coating the electromagnetic wire with insulating varnish using an enameling machine and then baking it in the enameling machine.

[0129] The insulating improver varnish includes the following raw materials in parts by weight:

[0130] 55 parts polyimide paint, 37.5 parts xylene solvent, 9 parts weather-resistant functional agent, and 5.5 parts modified filler.

[0131] The baking conditions for the enameling machine are: baking temperature of 350℃ and machine speed of 10m / min;

[0132] The thickness of the insulation layer is 0.85 mm;

[0133] The polyimide paint is prepared by first mixing pyromellitic dianhydride and p-phenylenediamine to obtain a product body. The product body and N,N-dimethylacetamide are then stirred at 9°C for 1 hour until the solution viscosity is constant, resulting in a polyimide paint body with a solid content of 15%.

[0134] The molar ratio of pyromellitic dianhydride to p-phenylenediamine is 1.05:1; the volume ratio of the product to N,N-dimethylacetamide is 1:1.2.

[0135] The preparation method of the weather-resistant functional agent in this embodiment is as follows:

[0136] S1, Preparation of the modified compounding agent:

[0137] S2, Silane coupling agent KH560, deionized water and ethanol are mixed evenly in a weight ratio of 3:5:8 to obtain silane coupling solution;

[0138] Five parts by weight of strontium titanate, 6.5 parts by weight of mullite, 2.5 parts by weight of bentonite, and 12.5 parts by weight of silane coupling solution were blended and ultrasonically treated. After ultrasonic treatment, a silane-coupled composite was obtained.

[0139] S3, silicon nitride is first irradiated in a proton irradiation chamber for 1 hour at an irradiation power of 375W. After irradiation, irradiated silicon nitride is obtained.

[0140] Irradiated silicon nitride and modified compounding agent were ball-milled at a weight ratio of 5:2.5 for the first conditioning treatment. After ball milling, the mixture was filtered and dried to obtain the first-conditioned ball mill body.

[0141] S4, the first-conditioned ball milling media and the silane-coupled composite are ball milled for the second conditioning treatment. After ball milling, the mixture is filtered and dried to obtain the weather-resistant functional agent.

[0142] In this embodiment, the ultrasonic power for the blending ultrasonic treatment is 475W, and the ultrasonic treatment lasts for 1 hour.

[0143] In this embodiment, the ball milling speed for the first conditioning treatment is 1100 r / min, and the ball milling time is 2 hours; the ball milling speed for the second conditioning treatment is 1600 r / min, and the ball milling time is 1 hour.

[0144] The preparation method of the modified compounding agent in this embodiment is as follows:

[0145] S1a: Carboxymethyl cellulose and barium zirconate are mixed at a weight ratio of 2:5 to obtain a homogeneous mixture. The homogeneous mixture is then added to sodium silicate solution at a weight ratio of 3:5 and stirred until homogeneous to obtain carboxymethyl cellulose solution.

[0146] S1b: Add 4 parts by weight of nano-magnesium carbonate and 2.5 parts by weight of boron oxide to 5.5 parts by weight of carboxymethyl cellulose solution and stir thoroughly to obtain the modified compounding agent.

[0147] The sodium silicate solution in this embodiment has a mass fraction of 6.5%.

[0148] The preparation method of the modified filler in this embodiment is as follows:

[0149] S11, 2.5 parts by weight of nano titanium dioxide, 4 parts by weight of boron nitride and 1.5 parts by weight of nano silica sol were added to 10 parts of sodium hexametaphosphate solution and stirred evenly to obtain a functional dispersion.

[0150] S12, 6.5 parts by weight of cordierite, 4 parts by weight of basalt fiber and 3 parts by weight of calcined talc are blended and sintered to obtain a filler additive;

[0151] The filler and functional dispersion were ultrasonically treated at a weight ratio of 3:5 with an ultrasonic power of 375W for 1 hour. After ultrasonication, the mixture was filtered and dried to obtain the modified filler.

[0152] The sodium hexametaphosphate solution in this embodiment has a mass fraction of 6.5%.

[0153] In this embodiment, the sintering temperature for the blending sintering process is 210°C, and the sintering time is 1 hour.

[0154] This embodiment describes the fabrication process of an insulating layer for electromagnetic wires.

[0155] Comparative Example 1

[0156] Unlike Example 3, no weather-resistant functional agent was added.

[0157] Comparative Example 2

[0158] Unlike Example 3, the modified compounding agent was not used for the first conditioning treatment of ball milling in the preparation of the weather-resistant functional agent.

[0159] Comparative Example 3

[0160] Unlike Example 3, the second conditioning treatment of the composite ball milling was not performed using silane coupling.

[0161] Comparative Example 4

[0162] Unlike Example 3, strontium titanate and mullite were not added in the preparation of the silane-coupled composite.

[0163] Comparative Example 5

[0164] Unlike Example 3, bentonite was not added in the preparation of the silane-coupled composite.

[0165] Comparative Example 6

[0166] Unlike Example 3, no modified filler was added.

[0167] Comparative Example 7

[0168] Unlike Example 3, no filler additives were added during the preparation of the modified filler.

[0169] Comparative Example 8

[0170] Unlike Example 3, cordierite and basalt fiber were not added during the preparation of the filler additives.

[0171] Comparative Example 9

[0172] Unlike Example 3, no functional dispersion was added during the preparation of the modified filler.

[0173] Comparative Example 10

[0174] Unlike Example 3, no nano-titanium oxide or boron nitride was added to the functional dispersion.

[0175] The insulation layers of the products from Examples 1-3 and Comparative Examples 1-10 were tested under normal conditions for their resistance to softening breakdown, abrasion resistance, and stain resistance. The products were also tested for weather resistance and temperature stability (at 500 W / m²). The sample was irradiated with ultraviolet light for 24 hours, then placed at 75°C for 12 hours, and then placed at -5°C for 12 hours (this constitutes one cycle, which was repeated 10 times). The performance measurement results are as follows:

[0176]

[0177] From Examples 1-3 and Comparative Examples 1-10, it was found that...

[0178] Under normal conditions, the product of Embodiment 3 of the present invention exhibits significant improvements in the insulation layer's resistance to softening and breakdown, abrasion resistance, and stain resistance. The product's performance can be improved in a coordinated manner, and its weather resistance and temperature change stability are also significant.

[0179] As can be seen from Comparative Examples 1-10 and Example 3, the performance of the product deteriorates significantly when neither weather-resistant functional agent nor modified filler is added. The product's performance is significantly improved when both are blended and formulated in a synergistic manner.

[0180] In the preparation of weather-resistant functional agents, the first ball milling conditioning treatment was not performed using a modified compounding agent, and the second ball milling conditioning treatment was not performed using a silane-coupled composite. Furthermore, strontium titanate and mullite were not added in the preparation of the silane-coupled composite, and bentonite was not added in the preparation of the silane-coupled composite. All these processes resulted in varying degrees of performance degradation. The silane-coupled composite obtained using the specific method of this invention, combined with a modified compounding agent for the first ball milling conditioning treatment, showed the most significant performance improvement. The inventors of this invention also discovered that without the modified compounding agent for the first ball milling conditioning treatment, the performance degradation of the product was more pronounced, and the modified compounding agent had a significant performance-enhancing effect on the product.

[0181] In the preparation of modified fillers, no filler additives are added; in the preparation of filler additives, no cordierite or basalt fiber is added; in the preparation of modified fillers, no functional dispersion is added; and in the functional dispersion, no nano-titanium oxide or boron nitride is added. The performance of the products all tends to deteriorate to varying degrees. The modified filler prepared by combining the functional dispersion obtained by the specific method of this invention with filler additives has the most significant performance effect. Other methods are not as effective as those of this invention.

[0182] Since the modified compounding agent significantly alters the product's performance, further research is needed:

[0183] Experimental Example 1

[0184] Same as Example 3, except that nano-magnesium carbonate was not added in the preparation of the modified compounding agent.

[0185] Experiment Example 2

[0186] Same as Example 3, except that boron oxide was not added in the preparation of the modified compounding agent.

[0187] Experimental Example 3

[0188] Same as Example 3, except that carboxymethyl cellulose and barium zirconate were not added to the carboxymethyl cellulose solution.

[0189] Experiment Example 4

[0190] Same as Example 3, except that the sodium silicate solution in the carboxymethyl cellulose solution is replaced with water.

[0191] The product performance test results for Experiment Examples 1-4 are as follows:

[0192]

[0193] As can be seen from Experiments 1-4, the performance of the modified compounding agent deteriorated significantly when nano-magnesium carbonate was not added during preparation. Similarly, the performance of the product was poor when carboxymethyl cellulose solution was not added to carboxymethyl cellulose solution. The performance of the product also deteriorated when boron oxide was not added during preparation of the modified compounding agent and when water was used instead of sodium silicate solution in carboxymethyl cellulose solution. Only when the specific raw materials of the present invention were used did the performance of the product be most significant. Other methods were not as effective as the present invention.

[0194] 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.

[0195] 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 method for producing an insulating layer for an electromagnetic wire, characterized by, The method comprises the following steps: The electromagnetic wire is coated with an insulation improvement paint by a paint coating machine, and then baked by the paint coating machine, so that the preparation of the insulation layer is completed; The insulation improvement paint comprises the following raw materials by weight: 50-60 parts of polyimide paint, 35-40 parts of xylene solvent, 7-11 parts of weather resistance functional agent, and 4-7 parts of modified filler agent; the weather resistance functional agent is prepared by the following method: S1, preparation of the modified complex agent: S2, the silane coupling agent KH560, deionized water and ethanol are stirred uniformly according to a weight ratio of 3:5:8 to obtain a silane coupling liquid; 4-6 parts by weight of strontium titanate, 5-8 parts by weight of mullite, 2-3 parts by weight of bentonite and 10-15 parts by weight of the silane coupling liquid are blended and ultrasonically treated, and after the ultrasonic treatment is completed, a silane coupling composite is obtained; S3, the silicon nitride is first irradiated in a proton irradiation box for 1h at an irradiation power of 350-400W, and after the irradiation is completed, the irradiated silicon nitride is obtained; The irradiated silicon nitride and the modified complex agent are ball milled for a first conditioning treatment according to a weight ratio of 5:(2-3), and after the ball milling is completed, the first conditioned ball milled body is obtained by filtration and drying; S4, the first conditioned ball milled body and the silane coupling composite are ball milled for a second conditioning treatment, and after the ball milling is completed, the weather resistance functional agent is obtained by filtration and drying.

2. The method of producing an insulating layer for an electromagnetic wire according to claim 1, characterized by, The baking treatment conditions of the paint coating machine are as follows: a baking temperature of 180-500°C, and a baking time of 3-4min; and the speed of the paint coating machine is 5-18m / min; The thickness of the insulation layer is 0.8-0.9mm; The polyimide paint is prepared by uniformly mixing pyromellitic dianhydride and p-phenylenediamine to obtain a product body, and then stirring the product body and N,N-dimethylacetamide at 8-10°C for 1h until the viscosity of the solution is constant, so that a polyimide paint body with a solid content of 15% is obtained; The molar ratio of pyromellitic dianhydride to p-phenylenediamine is (1.04-1.06):1; The volume ratio of the product body to N,N-dimethylacetamide is 1:(1.1-1.3).

3. The method of producing an insulating layer for an electromagnetic wire according to claim 2, characterized by, The ultrasonic power of the ultrasonic treatment is 450-500W, and the ultrasonic treatment time is 1h; The ball milling speed of the first conditioning treatment is 1050-1150r / min, and the ball milling time is 2h; and the ball milling speed of the second conditioning treatment is 1500-1700r / min, and the ball milling time is 1h.

4. The method of producing an insulating layer for an electromagnetic wire according to claim 3, characterized by, The preparation method of the modified complex agent is as follows: S1a: carboxymethyl cellulose and barium zirconate are uniformly mixed according to a weight ratio of 2:5 to obtain a mixed material, and then the mixed material is added to a sodium silicate solution according to a weight ratio of 3:5 and stirred uniformly to obtain a carboxymethyl cellulose liquid; S1b: 3-5 parts by weight of nano-magnesium carbonate and 2-3 parts by weight of boron oxide are blended and added to 4-7 parts of the carboxymethyl cellulose liquid, and then stirred thoroughly to obtain the modified complex agent.

5. The method of producing an insulating layer for an electromagnetic wire according to claim 4, characterized by, The mass fraction of the sodium silicate solution is 5-8%.

6. The method of producing an insulating layer for an electromagnetic wire according to claim 1, characterized by, The preparation method of the modified filler agent is as follows: S11, 2-3 parts by weight of nano-titanium oxide, 3-5 parts by weight of boron nitride and 1-2 parts by weight of nano-silica sol are added to 8-12 parts of a sodium hexametaphosphate solution and stirred uniformly to obtain a functional dispersion liquid; S12, 5-8 parts by weight of cordierite, 3-5 parts by weight of basalt fiber and 2-4 parts by weight of calcined talc are blended and sintered to obtain a filler additive; The filler additive and the functional dispersion liquid are ultrasonically treated at a weight ratio of 3:5, an ultrasonic power of 350-400 W and for 1 h, and then filtered and dried to obtain a modified filler.

7. The method of producing an insulating layer for an electromagnetic wire according to claim 6, characterized by, The mass fraction of the sodium hexametaphosphate solution is 5-8%.

8. The method of producing an insulating layer for an electromagnetic wire according to claim 6, characterized by, The sintering temperature of the blending and sintering treatment is 200-220 ℃, and the sintering time is 1 h.

9. An insulating layer for electromagnetic wires prepared by the method of any one of claims 1-8.

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