Insulating layer for electromagnetic wire and preparation process thereof

Abstract

The invention relates to the technical field of electromagnetic wire insulating layers, in particular to an insulating layer for an electromagnetic wire and a preparation method thereof, and the preparation method comprises the following steps: coating an insulating improved paint on the electromagnetic wire by adopting an enameling machine, and then continuously baking the electromagnetic wire by adopting the enameling machine to complete the preparation of the insulating layer. According to the insulating layer for the electromagnetic wire, the insulating layer is coated with the insulating improved paint through the enameling machine, the insulating improved paint is prepared from the polyimide paint, the xylene solvent, the weather change resistant functional agent and the modified filler, and the raw materials are co-matched, co-assisted and mutually blended to achieve a synergistic effect; the obtained insulating improved paint optimizes the softening breakdown property, wear resistance and pollution resistance of an insulating layer in a system, the performance coordination of a product is improved, and the weather resistance and temperature change resistance stability effects of the product are remarkable.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic wire insulation layers, and in particular to an insulation layer for electromagnetic wire and a preparation method thereof. Background Art

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

[0003] The preparation process of the insulating coating layer used for electromagnetic wire is relatively simple, and the obtained insulating layer has poor resistance to softening and breakdown. At the same time, the insulating layer has poor wear resistance and anti-fouling properties, the performance coordination of the product is not ideal, and the product's weather resistance and temperature change stability are poor, which limits the product's use efficiency. Summary of the Invention

[0004] In view of the defects of the prior art, the purpose of the present invention is to provide an insulation layer for electromagnetic wire and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0005] The present invention solves the technical problem by adopting the following technical solutions: The present invention provides a method for preparing an insulating layer for an electromagnetic wire, comprising the following steps: The electromagnetic wire is coated with insulation improvement paint using an enameling machine, and then the enameling machine is baked to complete the preparation of the insulation layer; The insulation improvement paint comprises the following raw materials in parts by weight: 50-60 parts of polyimide paint, 35-40 parts of xylene solvent, 7-11 parts of weathering functional agent, and 4-7 parts of modified filler.

[0006] Preferably, the conditions for the baking treatment of the enameling machine are: a baking temperature of 180-500° C. and a speed of the enameling machine of 5-18 m / min; The thickness of the insulation layer is 0.8-0.9mm; The polyimide paint is prepared by mixing pyromellitic dianhydride and p-phenylenediamine to obtain a product. The product and N,N-dimethylacetamide are stirred at 8-10°C for 1 hour until the solution viscosity becomes constant to obtain a polyimide paint with a solid content of 15%; The molar ratio of pyromellitic dianhydride and p-phenylenediamine is (1.04-1.06):1; the volume ratio of the product and N,N-dimethylacetamide is 1:(1.1-1.3).

[0007] Preferably, the preparation method of the weathering-resistant functional agent is: S1, Preparation of modified polyvalent agent: S2, mixing silane coupling agent KH560, deionized water and ethanol in 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 silane coupling liquid are mixed and ultrasonically treated until the ultrasonic treatment is completed to obtain a silane-coupled composite; S3, irradiating the silicon nitride in a proton irradiation box for 1 hour at an irradiation power of 350-400W, and obtaining irradiated silicon nitride after the irradiation is completed; The irradiated silicon nitride and the modified compounding agent are ball-milled in a weight ratio of 5:(2-3) for a first conditioning treatment. After the ball milling is completed, the mixture is filtered and dried to obtain a first-conditioned ball-milled body. S4, ball milling the first-conditioned ball mill body and the silane-coupled composite body for a second conditioning treatment, and after the ball milling is completed, filtering and drying are performed to obtain a weathering functional agent.

[0008] Preferably, the ultrasonic power of the blending ultrasonic treatment is 450-500W, and the ultrasonic treatment is for 1 hour.

[0009] Preferably, the ball milling speed of the first ball milling treatment is 1050-1150 r / min, and the ball milling is performed for 2 hours; the ball milling speed of the second ball milling treatment is 1500-1700 r / min, and the ball milling is performed for 1 hour.

[0010] Preferably, the preparation method of the modified compounding agent is: S1a: Carboxymethyl cellulose and barium zirconate are mixed in a weight ratio of 2:5 to obtain a mixture, and the mixture is further added to a sodium silicate solution in a weight ratio of 3:5 and stirred to obtain a carboxymethyl cellulose solution; S1b: 3-5 parts by weight of nano-magnesium carbonate and 2-3 parts by weight of boron oxide are mixed and added to 4-7 parts of carboxymethyl cellulose solution, and stirred thoroughly to obtain a modified compounding agent.

[0011] The weathering functional agent is made of silicon nitride and irradiated with protons to stimulate its active efficiency. It is then subjected to a first conditioning treatment by ball milling with a modified compounding agent. The modified compounding agent is blended with nano-magnesium carbonate and boron oxide in combination with a carboxymethyl cellulose solution. At the same time, the carboxymethyl cellulose and barium zirconate in the carboxymethyl cellulose solution are further synergized with a sodium silicate solution. Through the coordination and mutual optimization of the raw materials, the modified compounding agent prepared by the coordination and coordination of the raw materials is further coordinated with and optimized with silicon nitride, thereby enhancing the performance coordination and weathering resistance and temperature change stability of the system. And then the silane-coupled composite is subjected to a second conditioning treatment by ball milling. The silane-coupled composite is ultrasonically treated by blending strontium titanate, mullite and bentonite with silane coupling fluid. Through the optimization of the silane coupling fluid, the interface between the system raw materials is enhanced. At the same time, the use of strontium titanate, mullite and bentonite in a blending manner can further enhance the performance coordination and stability of the system.

[0012] Preferably, the mass fraction of the sodium silicate solution is 5-8%.

[0013] Preferably, the preparation method of the modified filler is: S11, adding 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 to 8-12 parts of sodium hexametaphosphate solution and stirring evenly to obtain a functional dispersion; S12, blending and sintering 5-8 parts by weight of cordierite, 3-5 parts by weight of basalt fiber, and 2-4 parts by weight of calcined talc to obtain a filler additive; The filler auxiliary agent and the functional dispersion liquid were ultrasonically treated in a weight ratio of 3:5, the ultrasonic power was 350-400W, the ultrasonic treatment was performed for 1 hour, and after the ultrasonic treatment was completed, the modified filler was filtered and dried to obtain the modified filler.

[0014] Preferably, the mass fraction of the sodium hexametaphosphate solution is 5-8%.

[0015] The modified filler is made of nano-titanium oxide, boron nitride and nano-silica sol, which are dispersed and improved with sodium hexametaphosphate solution. At the same time, the added filler additives are made of cordierite and basalt fiber and calcined talc, which are sintered and improved. Through the coordination between the raw materials, the self-cleaning points can be improved and the anti-fouling properties of the product can be optimized. At the same time, by combining raw materials such as boron nitride with cordierite and basalt fiber, and through the coordination and synergy between the raw materials, the modified filler and the weathering functional agent have a better coordinated reinforcement effect, thereby further improving the performance of the product.

[0016] Preferably, the sintering temperature of the blending sintering process is 200-220° C., and the sintering time is 1 hour.

[0017] The present invention also provides an insulating layer for electromagnetic wire prepared by a method for preparing the insulating layer for electromagnetic wire.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The insulation layer of the electromagnetic wire of the present invention is coated with insulation improvement paint by an enameling machine. The insulation improvement paint adopts polyimide paint, xylene solvent, weathering functional agent and modified filler. Through the co-matching and mutual coordination and synergy between the raw materials, the obtained insulation improvement paint optimizes the softening breakdown property, wear resistance and anti-fouling property of the insulation layer in the system, the performance coordination of the product is improved, and the weather resistance and temperature change resistance stability of the product are significantly improved. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] A method for preparing an insulating layer for an electromagnetic wire according to this embodiment includes the following steps: The electromagnetic wire is coated with insulation improvement paint using an enameling machine, and then the enameling machine is baked to complete the preparation of the insulation layer; The insulation improvement paint comprises the following raw materials in parts by weight: 50-60 parts of polyimide paint, 35-40 parts of xylene solvent, 7-11 parts of weathering functional agent, and 4-7 parts of modified filler.

[0021] The baking conditions of the enameling machine are: the baking temperature is 180-500℃ and the speed of the enameling machine is 5-18m / min; The thickness of the insulation layer is 0.8-0.9mm; The polyimide paint is prepared by mixing pyromellitic dianhydride and p-phenylenediamine to obtain a product. The product and N,N-dimethylacetamide are stirred at 8-10°C for 1 hour until the solution viscosity becomes constant to obtain a polyimide paint with a solid content of 15%; The molar ratio of pyromellitic dianhydride and p-phenylenediamine is (1.04-1.06):1; the volume ratio of the product and N,N-dimethylacetamide is 1:(1.1-1.3).

[0022] The preparation method of the weathering-resistant functional agent of this embodiment is: S1, Preparation of modified polyvalent agent: S2, mixing silane coupling agent KH560, deionized water and ethanol in 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 silane coupling liquid are mixed and ultrasonically treated until the ultrasonic treatment is completed to obtain a silane-coupled composite; S3, irradiating the silicon nitride in a proton irradiation box for 1 hour at an irradiation power of 350-400W, and obtaining irradiated silicon nitride after the irradiation is completed; The irradiated silicon nitride and the modified compounding agent are ball-milled in a weight ratio of 5:(2-3) for a first conditioning treatment. After the ball milling is completed, the mixture is filtered and dried to obtain a first-conditioned ball-milled body. S4, ball milling the first-conditioned ball mill body and the silane-coupled composite body for a second conditioning treatment, and after the ball milling is completed, filtering and drying are performed to obtain a weathering functional agent.

[0023] The ultrasonic power of the blending ultrasonic treatment in this embodiment is 450-500W, and the ultrasonic treatment is performed for 1 hour.

[0024] In this embodiment, the ball milling speed of the first conditioning treatment is 1050-1150 r / min, and the ball milling is performed for 2 hours; the ball milling speed of the second conditioning treatment is 1500-1700 r / min, and the ball milling is performed for 1 hour.

[0025] The preparation method of the modified polyhydrating agent of this embodiment is: S1a: Carboxymethyl cellulose and barium zirconate are mixed in a weight ratio of 2:5 to obtain a mixture, and the mixture is further added to a sodium silicate solution in a weight ratio of 3:5 and stirred to obtain a carboxymethyl cellulose solution; S1b: 3-5 parts by weight of nano-magnesium carbonate and 2-3 parts by weight of boron oxide are mixed and added to 4-7 parts of carboxymethyl cellulose solution, and stirred thoroughly to obtain a modified compounding agent.

[0026] The mass fraction of the sodium silicate solution in this embodiment is 5-8%.

[0027] The preparation method of the modified filler of this embodiment is: S11, adding 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 to 8-12 parts of sodium hexametaphosphate solution and stirring evenly to obtain a functional dispersion; S12, blending and sintering 5-8 parts by weight of cordierite, 3-5 parts by weight of basalt fiber, and 2-4 parts by weight of calcined talc to obtain a filler additive; The filler auxiliary agent and the functional dispersion liquid were ultrasonically treated in a weight ratio of 3:5, the ultrasonic power was 350-400W, the ultrasonic treatment was performed for 1 hour, and after the ultrasonic treatment was completed, the modified filler was filtered and dried to obtain the modified filler.

[0028] The mass fraction of the sodium hexametaphosphate solution in this embodiment is 5-8%.

[0029] The sintering temperature of the blending sintering process in this embodiment is 200-220° C., and the sintering time is 1 hour.

[0030] The insulating layer for electromagnetic wire is prepared by a method for preparing an insulating layer for electromagnetic wire in this embodiment.

[0031] Example 1 A method for preparing an insulating layer for an electromagnetic wire according to this embodiment includes the following steps: The electromagnetic wire is coated with insulation improvement paint using an enameling machine, and then the enameling machine is baked to complete the preparation of the insulation layer; The insulation improvement paint comprises the following raw materials in parts by weight: 60 parts of polyimide paint, 40 parts of xylene solvent, 11 parts of weathering functional agent, and 7 parts of modified filler.

[0032] The conditions for the baking treatment of the enameling machine are: a baking temperature of 180°C and a speed of 5 m / min; The thickness of the insulation layer is 0.9mm; The polyimide paint is prepared by mixing pyromellitic dianhydride and p-phenylenediamine to obtain a product. The product and N,N-dimethylacetamide are stirred at 8°C for 1 hour until the solution viscosity becomes constant, thereby obtaining a polyimide paint with a solid content of 15%; The molar ratio of pyromellitic dianhydride to p-phenylenediamine is 1.04:1; and the volume ratio of the product to N,N-dimethylacetamide is 1:1.1.

[0033] The preparation method of the weathering-resistant functional agent of this embodiment is: S1, Preparation of modified polyvalent agent: S2, mixing silane coupling agent KH560, deionized water and ethanol in a weight ratio of 3:5:8 to obtain a silane coupling liquid; 4 parts by weight of strontium titanate, 5 parts by weight of mullite, 2 parts by weight of bentonite and 10 parts by weight of silane coupling liquid were mixed and ultrasonically treated until the ultrasonic treatment was completed to obtain a silane-coupled composite; S3, irradiating the silicon nitride in a proton irradiation box for 1 hour at an irradiation power of 350W, and obtaining irradiated silicon nitride after the irradiation is completed; The irradiated silicon nitride and the modified compounding agent are ball-milled in a weight ratio of 5:2 for a first conditioning treatment. After the ball milling is completed, the mixture is filtered and dried to obtain a first-conditioned ball-milled body. S4, ball milling the first-conditioned ball mill body and the silane-coupled composite body for a second conditioning treatment, and after the ball milling is completed, filtering and drying are performed to obtain a weathering functional agent.

[0034] The ultrasonic power of the blending ultrasonic treatment in this embodiment is 450W, and the ultrasonic treatment is performed for 1 hour.

[0035] In this embodiment, the ball milling speed of the first conditioning treatment is 1050 r / min, and the ball milling is performed for 2 h; the ball milling speed of the second conditioning treatment is 1500 r / min, and the ball milling is performed for 1 h.

[0036] The preparation method of the modified polyhydrating agent of this embodiment is: S1a: Carboxymethyl cellulose and barium zirconate are mixed in a weight ratio of 2:5 to obtain a mixture, and the mixture is further added to a sodium silicate solution in a weight ratio of 3:5 and stirred to obtain a carboxymethyl cellulose solution; S1b: 3 parts by weight of nano-magnesium carbonate and 2 parts by weight of boron oxide are blended and added to 4 parts of carboxymethyl cellulose solution, and stirred thoroughly to obtain a modified compounding agent.

[0037] The mass fraction of the sodium silicate solution in this embodiment is 5%.

[0038] The preparation method of the modified filler of this embodiment is: S11, adding 2 parts by weight of nano-titanium oxide, 3 parts by weight of boron nitride, and 1 part by weight of nano-silica sol to 8 parts of sodium hexametaphosphate solution and stirring evenly to obtain a functional dispersion; S12, blending and sintering 5 parts by weight of cordierite, 3 parts by weight of basalt fiber, and 2 parts by weight of calcined talc to obtain a filler additive; The filler auxiliary agent and the functional dispersion were ultrasonically treated in a weight ratio of 3:5, the ultrasonic power was 350W, and the ultrasonic treatment was performed for 1 hour. After the ultrasonic treatment was completed, the modified filler was filtered and dried to obtain the modified filler.

[0039] The mass fraction of the sodium hexametaphosphate solution in this embodiment is 5%.

[0040] The sintering temperature of the blending sintering process in this embodiment is 200° C., and the sintering time is 1 hour.

[0041] The insulating layer for electromagnetic wire is prepared by a method for preparing an insulating layer for electromagnetic wire in this embodiment.

[0042] Example 2 A method for preparing an insulating layer for an electromagnetic wire according to this embodiment includes the following steps: The electromagnetic wire is coated with insulation improvement paint using an enameling machine, and then the enameling machine is baked to complete the preparation of the insulation layer; The insulation improvement paint comprises the following raw materials in parts by weight: 50 parts of polyimide paint, 35 parts of xylene solvent, 7 parts of weathering functional agent, and 4 parts of modified filler.

[0043] The conditions for the baking treatment of the enameling machine are: a baking temperature of 500°C and a speed of 18 m / min; The thickness of the insulation layer is 0.8mm; The polyimide paint is prepared by mixing pyromellitic dianhydride and p-phenylenediamine to obtain a product. The product and N,N-dimethylacetamide are stirred at 10°C for 1 hour until the solution viscosity becomes constant to obtain a polyimide paint with a solid content of 15%; The molar ratio of pyromellitic dianhydride to p-phenylenediamine is 1.06:1; and the volume ratio of the product to N,N-dimethylacetamide is 1:1.3.

[0044] The preparation method of the weathering-resistant functional agent of this embodiment is: S1, Preparation of modified polyvalent agent: S2, mixing silane coupling agent KH560, deionized water and ethanol in a weight ratio of 3:5:8 to obtain a silane coupling liquid; 6 parts by weight of strontium titanate, 8 parts by weight of mullite, 3 parts by weight of bentonite and 15 parts by weight of silane coupling liquid were mixed and ultrasonicated until the ultrasonication was terminated to obtain a silane-coupled composite; S3, irradiating the silicon nitride in a proton irradiation box for 1 hour at an irradiation power of 400 W, and then completing the irradiation to obtain irradiated silicon nitride; The irradiated silicon nitride and the modified compounding agent are ball-milled in a weight ratio of 5:3 for a first conditioning treatment. After the ball milling is completed, the mixture is filtered and dried to obtain a first-conditioned ball-milled body. S4, ball milling the first-conditioned ball mill body and the silane-coupled composite body for a second conditioning treatment, and after the ball milling is completed, filtering and drying are performed to obtain a weathering functional agent.

[0045] The ultrasonic power of the blending ultrasonic treatment in this embodiment is 500W, and the ultrasonic treatment is performed for 1 hour.

[0046] In this embodiment, the ball milling speed of the first conditioning treatment is 1150 r / min, and the ball milling is performed for 2 h; the ball milling speed of the second conditioning treatment is 1700 r / min, and the ball milling is performed for 1 h.

[0047] The preparation method of the modified polyhydrating agent of this embodiment is: S1a: Carboxymethyl cellulose and barium zirconate are mixed in a weight ratio of 2:5 to obtain a mixture, and the mixture is further added to a sodium silicate solution in a weight ratio of 3:5 and stirred to obtain a carboxymethyl cellulose solution; S1b: 5 parts by weight of nano-magnesium carbonate and 3 parts by weight of boron oxide are blended and added to 7 parts of carboxymethyl cellulose solution, and stirred thoroughly to obtain a modified compounding agent.

[0048] The mass fraction of the sodium silicate solution in this embodiment is 8%.

[0049] The preparation method of the modified filler of this embodiment is: S11, adding 3 parts by weight of nano-titanium oxide, 5 parts by weight of boron nitride, and 2 parts by weight of nano-silica sol to 12 parts of sodium hexametaphosphate solution and stirring evenly to obtain a functional dispersion; S12, blending and sintering 8 parts by weight of cordierite, 5 parts by weight of basalt fiber, and 4 parts by weight of calcined talc to obtain a filler additive; The filler auxiliary agent and the functional dispersion liquid were ultrasonically treated in a weight ratio of 3:5, the ultrasonic power was 400 W, the ultrasonic treatment was performed for 1 hour, and after the ultrasonic treatment was completed, the modified filler was filtered and dried to obtain the modified filler.

[0050] The mass fraction of the sodium hexametaphosphate solution in this embodiment is 8%.

[0051] The sintering temperature of the blending sintering process in this embodiment is 220° C., and the sintering time is 1 hour.

[0052] The insulating layer for electromagnetic wire is prepared by a method for preparing an insulating layer for electromagnetic wire in this embodiment.

[0053] Example 3 A method for preparing an insulating layer for an electromagnetic wire according to this embodiment includes the following steps: The electromagnetic wire is coated with insulation improvement paint using an enameling machine, and then the enameling machine is baked to complete the preparation of the insulation layer; The insulation improvement paint comprises the following raw materials in parts by weight: 55 parts of polyimide paint, 37.5 parts of xylene solvent, 9 parts of weathering functional agent, and 5.5 parts of modified filler.

[0054] The conditions for the baking treatment of the enameling machine are: a baking temperature of 350°C and a speed of 10 m / min; The thickness of the insulation layer is 0.85mm; The polyimide paint is prepared by mixing pyromellitic dianhydride and p-phenylenediamine to obtain a product. The product and N,N-dimethylacetamide are stirred at 9°C for 1 hour until the solution viscosity becomes constant to obtain a polyimide paint with a solid content of 15%; The molar ratio of pyromellitic dianhydride to p-phenylenediamine is 1.05:1; and the volume ratio of the product to N,N-dimethylacetamide is 1:1.2.

[0055] The preparation method of the weathering-resistant functional agent of this embodiment is: S1, Preparation of modified polyvalent agent: S2, mixing silane coupling agent KH560, deionized water and ethanol in a weight ratio of 3:5:8 to obtain a silane coupling liquid; 5 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 liquid were mixed and ultrasonicated until the ultrasonication was terminated to obtain a silane-coupled composite; S3, irradiating the silicon nitride in a proton irradiation box for 1 hour at an irradiation power of 375W, and obtaining irradiated silicon nitride after the irradiation is completed; The irradiated silicon nitride and the modified compounding agent are ball-milled in a weight ratio of 5:2.5 for a first conditioning treatment. After the ball milling is completed, the mixture is filtered and dried to obtain a first-conditioned ball-milled body. S4, ball milling the first-conditioned ball mill body and the silane-coupled composite body for a second conditioning treatment, and after the ball milling is completed, filtering and drying are performed to obtain a weathering functional agent.

[0056] The ultrasonic power of the blending ultrasonic treatment in this embodiment is 475W, and the ultrasonic treatment is performed for 1 hour.

[0057] In this embodiment, the ball milling speed of the first conditioning treatment is 1100 r / min, and the ball milling is performed for 2 hours; the ball milling speed of the second conditioning treatment is 1600 r / min, and the ball milling is performed for 1 hour.

[0058] The preparation method of the modified polyhydrating agent of this embodiment is: S1a: Carboxymethyl cellulose and barium zirconate are mixed in a weight ratio of 2:5 to obtain a mixture, and the mixture is further added to a sodium silicate solution in a weight ratio of 3:5 and stirred to obtain a carboxymethyl cellulose solution; S1b: 4 parts by weight of nano-magnesium carbonate and 2.5 parts by weight of boron oxide were blended and added to 5.5 parts of carboxymethyl cellulose solution, and stirred thoroughly to obtain a modified compounding agent.

[0059] The mass fraction of the sodium silicate solution in this embodiment is 6.5%.

[0060] The preparation method of the modified filler of this embodiment is: S11, adding 2.5 parts by weight of nano-titanium oxide, 4 parts by weight of boron nitride, and 1.5 parts by weight of nano-silica sol to 10 parts of sodium hexametaphosphate solution and stirring evenly to obtain a functional dispersion; S12, blending and sintering 6.5 parts by weight of cordierite, 4 parts by weight of basalt fiber, and 3 parts by weight of calcined talc to obtain a filler additive; The filler auxiliary agent and the functional dispersion were ultrasonically treated in a weight ratio of 3:5, the ultrasonic power was 375W, and the ultrasonic treatment was performed for 1 hour. After the ultrasonic treatment was completed, the modified filler was filtered and dried to obtain the modified filler.

[0061] The mass fraction of the sodium hexametaphosphate solution in this embodiment is 6.5%.

[0062] The sintering temperature of the blending sintering process in this embodiment is 210° C., and the sintering time is 1 hour.

[0063] The insulating layer for electromagnetic wire is prepared by a method for preparing an insulating layer for electromagnetic wire in this embodiment.

[0064] Comparative Example 1 The difference from Example 3 is that no weathering functional agent is added.

[0065] Comparative Example 2 The difference from Example 3 is that the modified compounding agent is not used in the first ball milling treatment in the preparation of the weathering functional agent.

[0066] Comparative Example 3 The difference from Example 3 is that the second conditioning treatment of ball milling the silane-coupled composite is not adopted.

[0067] Comparative Example 4 The difference from Example 3 is that no strontium titanate or mullite is added in the preparation of the silane-coupled composite.

[0068] Comparative Example 5 The difference from Example 3 is that bentonite was not added in the preparation of the silane-coupled composite.

[0069] Comparative Example 6 The difference from Example 3 is that no modified filler is added.

[0070] Comparative Example 7 The difference from Example 3 is that no filler auxiliary agent is added during the preparation of the modified filler.

[0071] Comparative Example 8 The difference from Example 3 is that cordierite and basalt fiber are not added in the preparation of the filler additive.

[0072] Comparative Example 9 The difference from Example 3 is that no functional dispersant is added in the preparation of the modified filler.

[0073] Comparative Example 10 The difference from Example 3 is that nano titanium oxide and boron nitride are not added to the functional dispersion.

[0074] The products of Examples 1-3 and Comparative Examples 1-10 were tested for their softening breakdown resistance, wear resistance and anti-fouling properties under normal conditions, as well as their weather resistance and temperature change stability (the products were tested at 500W / m The test results are as follows:

[0075] From Examples 1-3 and Comparative Examples 1-10, it can be concluded that Under normal conditions, the product of Example 3 of the present invention has significant effects on the softening and breakdown resistance, wear resistance, and anti-fouling properties of the insulation layer, achieving coordinated improvements in product performance, and having significant effects on the weather resistance and temperature change resistance of the product. From Comparative Examples 1-10 and Example 3, it can be seen that when neither the weathering functional agent nor the modified filler is added to the product, the performance of the product deteriorates significantly. By blending the two together, the performance of the product is significantly improved. In the preparation of the weathering functional agent, the modified compounding agent was not used for the first ball milling treatment, the silane-coupled composite was not used for the second ball milling treatment, 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. The performance of the products showed a trend of deterioration to varying degrees. The performance effect of the product was most significant when the silane-coupled composite obtained by the specific method of the present invention was combined with the modified compounding agent for the first ball milling treatment. At the same time, the inventors of the present invention also found that when the modified compounding agent was not used for the first ball milling treatment, the performance of the product deteriorated significantly, and the modified compounding agent had a significant effect on improving the performance of the product. No filler additive was added in the preparation of the modified filler, cordierite and basalt fiber were not added in the preparation of the filler additive, no functional dispersion was added in the preparation of the modified filler, and nano-titanium oxide and boron nitride were not added to the functional dispersion. The performance of the products showed a trend of deterioration to varying degrees. The modified filler prepared by combining the functional dispersion obtained by the specific method of the present invention with the filler additive had the most significant performance effect. The effects of the present invention were not as obvious when other methods were used instead.

[0076] The modified compounding agent has a significant impact on the performance of the product, and further research is needed: Experimental Example 1 The same as Example 3, except that nano magnesium carbonate is not added in the preparation of the modified compounding agent.

[0077] Experimental Example 2 The same as Example 3, except that boron oxide was not added in the preparation of the modified compounding agent.

[0078] Experimental Example 3 The same as Example 3, except that carboxymethyl cellulose and barium zirconate were not added to the carboxymethyl cellulose solution.

[0079] Experimental Example 4 The same as Example 3, the only difference is that the sodium silicate solution in the carboxymethyl cellulose solution is replaced by water.

[0080] The product performance test results of Experimental Examples 1-4 are as follows:

[0081] As can be seen from Experimental Examples 1-4, the performance of the product deteriorated significantly when nano-magnesium carbonate was not added in the preparation of the modified multiplexing agent. At the same time, carboxymethyl cellulose and barium zirconate were not added to the carboxymethyl cellulose solution, and the performance of the product was poor. Boron oxide was not added to the preparation of the modified multiplexing agent, and the sodium silicate solution in the carboxymethyl cellulose solution was replaced by water. The performance of the product showed a trend of deterioration. Only by using the specific raw materials of the present invention, the performance of the product was the most significant, and the use of other methods instead was not as obvious as the effect of the present invention.

[0082] 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 embodied 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 illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0083] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for preparing an insulating layer for an electromagnetic wire, characterized in that: The following steps are involved: The electromagnetic wire is coated with insulation improvement paint using an enameling machine, and then the enameling machine is baked to complete the preparation of the insulation layer; The insulation improvement paint comprises the following raw materials in parts by weight: 50-60 parts of polyimide paint, 35-40 parts of xylene solvent, 7-11 parts of weathering functional agent, and 4-7 parts of modified filler.

2. The method for preparing an insulating layer for an electromagnetic wire according to claim 1, characterized in that: The baking conditions of the enameling machine are: the baking temperature is 180-500℃ and the speed of the enameling machine is 5-18m / min; The thickness of the insulation layer is 0.8-0.9mm; The polyimide paint is prepared by mixing pyromellitic dianhydride and p-phenylenediamine to obtain a product. The product and N,N-dimethylacetamide are stirred at 8-10°C for 1 hour until the solution viscosity becomes constant to obtain a polyimide paint with a solid content of 15%; The molar ratio of pyromellitic dianhydride and p-phenylenediamine is (1.04-1.06):1; The volume ratio of the product and N,N-dimethylacetamide is 1:(1.1-1.3).

3. The method for preparing an insulating layer for an electromagnetic wire according to claim 1, characterized in that: The preparation method of the weathering-resistant functional agent is as follows: S1, Preparation of modified polyvalent agent: S2, mixing silane coupling agent KH560, deionized water and ethanol in 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 silane coupling liquid are mixed and ultrasonically treated until the ultrasonic treatment is completed to obtain a silane-coupled composite; S3, irradiating the silicon nitride in a proton irradiation box for 1 hour at an irradiation power of 350-400W, and obtaining irradiated silicon nitride after the irradiation is completed; The irradiated silicon nitride and the modified compounding agent are ball-milled in a weight ratio of 5:(2-3) for a first conditioning treatment. After the ball milling is completed, the mixture is filtered and dried to obtain a first-conditioned ball-milled body. S4, ball milling the first-conditioned ball mill body and the silane-coupled composite body for a second conditioning treatment, and after the ball milling is completed, filtering and drying are performed to obtain a weathering functional agent.

4. The method for preparing an insulating layer for an electromagnetic wire according to claim 3, characterized in that: The ultrasonic power of the blending ultrasonic treatment is 450-500W, and the ultrasonic treatment is performed for 1 hour; The ball milling speed of the first ball milling treatment is 1050-1150 r / min, and the ball milling is carried out for 2 hours; the ball milling speed of the second ball milling treatment is 1500-1700 r / min, and the ball milling is carried out for 1 hour.

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

6. The method for preparing an insulating layer for an electromagnetic wire according to claim 5, characterized in that: The mass fraction of the sodium silicate solution is 5-8%.

7. The method for preparing an insulation layer for an electromagnetic wire according to claim 1, characterized in that: The preparation method of the modified filler is: S11, adding 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 to 8-12 parts of sodium hexametaphosphate solution and stirring evenly to obtain a functional dispersion; S12, blending and sintering 5-8 parts by weight of cordierite, 3-5 parts by weight of basalt fiber, and 2-4 parts by weight of calcined talc to obtain a filler additive; The filler auxiliary agent and the functional dispersion liquid were ultrasonically treated in a weight ratio of 3:5, the ultrasonic power was 350-400W, the ultrasonic treatment was performed for 1 hour, and after the ultrasonic treatment was completed, the modified filler was filtered and dried to obtain the modified filler.

8. The method for preparing an insulating layer for an electromagnetic wire according to claim 7, characterized in that: The mass fraction of the sodium hexametaphosphate solution is 5-8%.

9. The method for preparing an insulating layer for an electromagnetic wire according to claim 7, characterized in that: The sintering temperature of the blending sintering process is 200-220° C., and the sintering time is 1 hour.

10. An insulating layer for an electromagnetic wire prepared by the method for preparing an insulating layer for an electromagnetic wire according to any one of claims 1 to 9.

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