High-temperature-resistant self-adhesive three-layer insulated wire material and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant self-adhesive three-layer insulated wire material and a preparation method thereof, and relates to the technical field of composite materials. The high-temperature-resistant self-adhesive three-layer insulated wire material at least comprises the following components: 60-70 parts by mass of modified unsaturated polyester; 10-20 parts by mass of modified epoxy resin; 10-12 parts by mass of a diluent; 5-15 parts by mass of a filler; 0.2-1 part by mass of an initiator; 0-0.1 part by mass of a polymerization inhibitor; and 0.1-1 part by mass of a curing agent. According to the high-temperature-resistant self-adhesive three-layer insulated wire material and the preparation method thereof provided by the invention, the unsaturated polyester is modified by the organic silicon prepolymer, and the epoxy resin is modified by the amine compound, so that the high temperature resistance, corrosion resistance and impact resistance of the obtained high-temperature-resistant self-adhesive three-layer insulated wire self-adhesive paint layer can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of composite materials, and in particular to a high-temperature resistant self-adhesive three-layer insulated wire material and a preparation method thereof. Background Art

[0002] Three-layer insulated wire is also called triple insulated wire. It is a high-performance insulated wire newly developed internationally in recent years. This wire has three insulating layers, with the core wire in the middle. The first layer is a golden polyamide film, the second layer is a highly insulating spray paint coating, and the third layer (outermost layer) is a transparent glass fiber layer. Self-adhesive three-layer insulated wire is coated with a layer of self-adhesive paint on the outside of the third layer, which makes the wires bond together when heated or using solvents. The three-layer insulated wire has high insulation strength, does not require a barrier layer to ensure a safety margin, and does not require an insulating tape layer between stages. It has a high current density and is suitable for cutting-edge technology, defense fields, and the production of micro motor windings and high-frequency transformer windings for miniaturized switching power supplies.

[0003] At present, with the development of modern industry, electrical and electronic equipment is showing a trend of safety, high efficiency, energy saving and light weight. The application of high-performance insulating materials in the field of electrical and electronic equipment has reduced the volume of components and raw materials by nearly 30%. However, light weight will inevitably lead to an increase in its operating temperature, and high-temperature resistant three-layer insulated wire is required. In particular, with the development trend of high power and miniaturization of power supplies, higher requirements are placed on the high temperature resistance of the materials used. Therefore, high temperature resistant insulating self-adhesive materials are indispensable key materials in high-tech projects, and the materials are required to have good adhesion, mechanical strength, insulation performance, heat resistance, wear resistance, salt spray resistance and resistance to harsh environments. Based on performance and cost advantages, unsaturated polyester is widely used in the field of high temperature resistant insulating self-adhesive materials, but pure polyester materials have poor heat shock resistance and are easily hydrolyzed under high temperature and high humidity conditions. In view of the above situation, modifying polyester is a routine operation in the prior art, but the modified polyester material still has the disadvantages of poor high temperature resistance, poor impact resistance and poor corrosion resistance, and the traditional heat resistance temperature can no longer meet the existing market demand. Therefore, it is urgent to develop a new type of high temperature resistant self-adhesive three-layer insulating wire material. Summary of the invention

[0004] The purpose of the present invention is to provide a high temperature resistant self-adhesive three-layer insulated wire material and a preparation method thereof, so as to solve the following technical problems:

[0005] The existing self-adhesive paint layer material of the high-temperature resistant self-adhesive three-layer insulated wire has the problems of poor high-temperature resistance, poor impact resistance and poor corrosion resistance.

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

[0007] A high temperature resistant self-adhesive three-layer insulated wire material, comprising at least the following components:

[0008]

[0009] Wherein, the modified unsaturated polyester is selected from unsaturated polyester modified by a combination of one or more of methylvinylchlorosilane, vinylphenyldichlorosilane, vinyltrichlorosilane, methyltriethoxysilane, methyltrimethoxysilane or phenyltriethoxysilane or vinyltriethoxysilane, and the modified epoxy resin is selected from epoxy resin modified by a combination of one or more of N-(4-aminophenyl)maleimide, bismaleimide, ketimine or polyetherimide.

[0010] As a further solution of the present invention: the filler is one or more of medium-nano silicon dioxide, carbon nanotubes, mica powder or talc powder.

[0011] As a further embodiment of the present invention: the diluent is one or more of vinyl toluene, 1,4-butanediol diacrylate, diallyl phthalate, neopentyl glycol diacrylate or styrene.

[0012] As a further embodiment of the present invention: the initiator is one or more of dicumyl peroxide, tert-butyl perbenzoate or ethyl-3,3-di(tert-butyl peroxide)butyrate.

[0013] As a further embodiment of the present invention: the polymerization inhibitor is one or more of methylhydroquinone, methylhydroquinone, hydroquinone or 2,5-di-tert-butylhydroquinone.

[0014] As a further embodiment of the present invention: the curing agent is one or more of zinc octoate, zinc cyclopentaneate, cobalt cyclopentaneate or calcium cyclopentaneate.

[0015] A method for preparing a high temperature resistant self-adhesive three-layer insulated wire material comprises at least the following steps:

[0016] The organosilicon monomer is subjected to a hydrolysis condensation reaction with deionized water to obtain an organosilicon prepolymer;

[0017] A saturated or unsaturated dibasic acid and / or a first acid anhydride is mixed with a diol to perform a polycondensation reaction to obtain an unsaturated polyester prepolymer, and the organosilicon prepolymer is added to the unsaturated polyester prepolymer to react to obtain a modified unsaturated polyester;

[0018] The amine compound and the epoxy resin are mixed and reacted to obtain a modified epoxy resin;

[0019] The modified unsaturated polyester and the modified epoxy resin are mixed and reacted, and after the reaction is completed, fillers, initiators, curing agents, inhibitors and diluents are added to the system to obtain a high temperature resistant self-adhesive three-layer insulated wire material.

[0020] As a further solution of the present invention: the mass ratio of the deionized water to the organosilicon monomer is 1:2.0-6.5.

[0021] As a further embodiment of the present invention: the epoxy resin is one or more of bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin or hydrogenated bisphenol A epoxy resin, and the molar ratio of the amine compound to the epoxy resin is 1:2-3.

[0022] A high temperature resistant self-adhesive three-layer insulated wire, comprising at least:

[0023] Core wire;

[0024] A first insulating layer, covering the outer peripheral wall of the core wire;

[0025] A second insulating layer, covering an outer peripheral wall of the first insulating layer away from the core wire;

[0026] a third insulating layer, covering an outer peripheral wall of the second insulating layer away from the first insulating layer;

[0027] The self-adhesive paint layer is coated on the outer peripheral wall of the third insulating layer away from the second insulating layer, and the self-adhesive paint layer includes the above-mentioned high temperature resistant self-adhesive three-layer insulating wire material.

[0028] Beneficial effects of the present invention:

[0029] (1) The high temperature resistant self-adhesive three-layer insulated wire material obtained by the present invention is modified by adding silicone prepolymer, modified epoxy resin and nano-scale inorganic filler to modify the unsaturated polyester during the synthesis process, so as to prepare a self-adhesive paint layer for the high temperature resistant self-adhesive three-layer insulated wire, so that the obtained self-adhesive paint layer has good high temperature resistance, corrosion resistance, impact resistance and other properties, and has broad application prospects in the fields of electronic appliances, aerospace and composite materials. The present invention adds epoxy resin during the synthesis process of unsaturated polyester resin. In addition to having excellent moisture and heat resistance, epoxy resin is equivalent to introducing end-capping monomers into unsaturated polyester, reducing polar groups and improving the moisture and heat resistance of the impregnating paint. In addition, the epoxy resin is modified by amine compounds to further improve the moisture and heat resistance, flame retardancy and insulation properties of the obtained self-adhesive paint layer, and can also reduce the viscosity of the self-adhesive paint layer and improve its processing performance.

[0030] (2) The present invention also uses an organosilicon prepolymer to modify the unsaturated polyester. The organosilicon prepolymer undergoes a condensation reaction with the hydroxyl groups on the polyester chain segments and is connected to the polyester chain segments. The introduction of the flexible chain of the organosilicon prepolymer improves the toughness of the unsaturated polyester resin and improves its impact resistance. The high heat resistance of the organosilane also improves the heat resistance of the product. At the same time, nano-scale inorganic fillers are added to the polyester to improve the corrosion resistance of the self-adhesive paint layer obtained by the present invention, and also greatly improve the high temperature resistance and anti-aging performance of the polyester material. DETAILED DESCRIPTION

[0031] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1

[0033] The preparation method of the organosilicon prepolymer comprises the following steps:

[0034] Add vinyl triethoxysilane and anhydrous ethanol into a three-necked flask, add a stirring and heating device, stir thoroughly, add dilute hydrochloric acid with a concentration of 1.0 mol / L to adjust the pH value of the mixture in the three-necked flask to between 3 and 5, heat to 50° C., inject 10 g of deionized water into a Buchner funnel and install it on the reaction device, slowly drip into the three-necked flask, complete the dripping within 2 hours, then heat to 130° C. for polycondensation reaction for 0.5 hours, and finally reduce the pressure to remove anhydrous ethanol, residual water and low molecular weight substances to obtain an organosilicon prepolymer;

[0035] The preparation method of modified unsaturated polyester comprises the following steps:

[0036] 20 parts by mass of isophthalic acid, 30 parts by mass of maleic anhydride and 10 parts by mass of propylene glycol are added to a reaction kettle, the temperature is raised to 150° C. and maintained for 2 hours, then the temperature is raised to 200° C. at a rate of 10° C. / min, and the temperature is maintained until the acid value is less than 25 mgKOH / g, then the temperature is lowered to below 100° C. to obtain an unsaturated polyester prepolymer, and then the obtained organosilicon oligomer is added to the reaction system, and the temperature is raised to 120° C. to react for 1 hour, and a condensation reaction is carried out with the unsaturated polyester prepolymer to obtain a modified unsaturated polyester;

[0037] The preparation method of the modified epoxy resin comprises the following steps:

[0038] Take 10 parts by weight of bisphenol A epoxy resin and add it into a reaction kettle and heat it to 90-100° C., add 1 part by weight of bismaleimide under stirring, the reaction temperature is 90° C., the reaction time is 0.5 h, until the material is transparent, and cool it to obtain a modified epoxy resin;

[0039] The preparation method of the high temperature resistant self-adhesive three-layer insulated wire material comprises the following steps:

[0040] The modified unsaturated polyester and modified epoxy resin prepared above are added into a nitrogen-filled reaction vessel, the reaction temperature is 100-110° C., the reaction time is 1 h, and 10 parts by mass of filler nano-silica, 10 parts by mass of diluent 1,4-butanediol diacrylate, 0.5 parts by mass of initiator tert-butyl peroxyvalerate, 0.01 parts by mass of inhibitor hydroquinone, and 10 parts by mass of curing agent zinc isooctanoate are added into the reactor, and the mixture is dispersed and stirred evenly to obtain a high-temperature resistant self-adhesive three-layer insulated wire material;

[0041] The preparation method of the high temperature resistant self-adhesive three-layer insulated wire comprises the following steps:

[0042] A copper conductor is selected as the core wire, and a copper round wire is drawn. The first insulating layer, the second insulating layer, the third insulating layer and the self-adhesive paint layer are coated on the outside of the copper round wire at one time, wherein the first insulating layer is a polyamide film, the second insulating layer is a high-insulation spray paint coating, the third insulating layer is a glass fiber layer, and the self-adhesive layer is the above-mentioned high-temperature resistant self-adhesive three-layer insulated wire material. The painting process is: each layer is painted in multiple coats, and after each coat, it is cross-linked and cured in the temperature range of 380±30℃, and naturally cooled after the reaction. After it is completely cured, the above painting process is repeated, and after the painting is completed and completely cured, it is formed into a wire to obtain a high-temperature resistant self-adhesive three-layer insulated wire sample.

[0043] Example 2

[0044] The preparation method of the organosilicon prepolymer comprises the following steps:

[0045] Phenyltriethoxysilane and anhydrous ethanol are added to a three-necked flask, and a stirring and heating device is installed. The mixture is stirred evenly, and dilute hydrochloric acid with a concentration of 1.0 mol / L is added to adjust the pH value of the mixture in the three-necked flask to between 3 and 5. The temperature is raised to 50° C., 10 g of deionized water is injected into a Buchner funnel and installed on the reaction device, and the mixture is slowly dripped into the three-necked flask. The addition is completed within 2 hours, and then the temperature is raised to 130° C. for polycondensation reaction for 0.5 hours. Finally, the anhydrous ethanol, residual water and low molecular weight substances are removed under reduced pressure to obtain an organosilicon prepolymer.

[0046] The preparation method of modified unsaturated polyester comprises the following steps:

[0047] 20 parts by mass of isophthalic acid, 30 parts by mass of maleic anhydride and 10 parts by mass of propylene glycol were added into a reactor, the temperature was raised to 150°C and maintained for 2 hours, then the temperature was raised to 200°C at a rate of 10°C / min, and the temperature was maintained until the acid value was less than 25 mgKOH / g, and then the temperature was lowered to below 100°C to obtain an unsaturated polyester prepolymer, and the above-obtained organosilicon oligomer was added into the reaction system, and the temperature was raised to 120°C for reaction for 1 hour, and a condensation reaction was carried out with the unsaturated polyester prepolymer to obtain a modified unsaturated polyester.

[0048] The preparation method of the modified epoxy resin comprises the following steps:

[0049] Take 10 parts by weight of bisphenol A epoxy resin and add it into a reaction kettle and heat it to 90-100° C., add 1 part by weight of bismaleimide under stirring, the reaction temperature is 90° C., the reaction time is 0.5 h, until the material is transparent, and cool it to obtain a modified epoxy resin;

[0050] The preparation method of the high temperature resistant self-adhesive three-layer insulated wire material comprises the following steps:

[0051] The modified unsaturated polyester and modified epoxy resin prepared above are added into a nitrogen-filled reaction vessel, the reaction temperature is 100-110° C., the reaction time is 1 h, and 10 parts by mass of filler nano-silica, 10 parts by mass of diluent 1,4-butanediol diacrylate, 0.5 parts by mass of initiator tert-butyl peroxyvalerate, 0.01 parts by mass of inhibitor hydroquinone, and 10 parts by mass of curing agent zinc isooctanoate are added into the reactor, and the mixture is dispersed and stirred evenly to obtain a high-temperature resistant self-adhesive three-layer insulated wire material;

[0052] The preparation method of the high temperature resistant self-adhesive three-layer insulated wire comprises the following steps:

[0053] A copper conductor is selected as the core wire, and a copper round wire is drawn. The first insulating layer, the second insulating layer, the third insulating layer and the self-adhesive paint layer are coated on the outside of the copper round wire at one time, wherein the first insulating layer is a polyamide film, the second insulating layer is a high-insulation spray paint coating, the third insulating layer is a glass fiber layer, and the self-adhesive layer is the above-mentioned high-temperature resistant self-adhesive three-layer insulated wire material. The painting process is: each layer is painted in multiple coats, and after each coat, it is cross-linked and cured in the temperature range of 380±30℃, and naturally cooled after the reaction. After it is completely cured, the above painting process is repeated, and after the painting is completed and completely cured, it is formed into a wire to obtain a high-temperature resistant self-adhesive three-layer insulated wire sample.

[0054] Example 3

[0055] The preparation method of the organosilicon prepolymer comprises the following steps:

[0056] Phenyltriethoxysilane and anhydrous ethanol are added to a three-necked flask, and a stirring and heating device is installed. The mixture is stirred evenly, and dilute hydrochloric acid with a concentration of 1.0 mol / L is added to adjust the pH value of the mixture in the three-necked flask to between 3 and 5. The temperature is raised to 50° C., 10 g of deionized water is injected into a Buchner funnel and installed on the reaction device, and the mixture is slowly dripped into the three-necked flask. The addition is completed within 2 hours, and then the temperature is raised to 130° C. for polycondensation reaction for 0.5 hours. Finally, the anhydrous ethanol, residual water and low molecular weight substances are removed under reduced pressure to obtain an organosilicon prepolymer.

[0057] The preparation method of modified unsaturated polyester comprises the following steps:

[0058] 20 parts by mass of isophthalic acid, 30 parts by mass of maleic anhydride and 10 parts by mass of propylene glycol were added into a reactor, the temperature was raised to 150°C and maintained for 2 hours, then the temperature was raised to 200°C at a rate of 10°C / min, and the temperature was maintained until the acid value was less than 25 mgKOH / g, and then the temperature was lowered to below 100°C to obtain an unsaturated polyester prepolymer, and the above-obtained organosilicon oligomer was added into the reaction system, and the temperature was raised to 120°C for reaction for 1 hour, and a condensation reaction was carried out with the unsaturated polyester prepolymer to obtain a modified unsaturated polyester.

[0059] The preparation method of the modified epoxy resin comprises the following steps:

[0060] 10 parts by mass of bisphenol A epoxy resin was added to a reaction kettle and heated to 90-100° C., and 1 part by mass of N-(4-aminophenyl)maleimide was added under stirring. The reaction temperature was 90° C. and the reaction time was 2 h. The reaction was continued until the material became transparent and then cooled to obtain a modified epoxy resin.

[0061] The preparation method of the high temperature resistant self-adhesive three-layer insulated wire material comprises the following steps:

[0062] The modified unsaturated polyester and modified epoxy resin prepared above are added into a nitrogen-filled reaction vessel, the reaction temperature is 100-110° C., the reaction time is 1 h, and 10 parts by mass of a mixture of filler nano-silica and carbon nanotubes, 10 parts by mass of a diluent 1,4-butanediol diacrylate, 0.5 parts by mass of an initiator tert-butyl peroxyvalerate, 0.01 parts by mass of a polymerization inhibitor hydroquinone, and 10 parts by mass of a curing agent zinc isooctanoate are added into the reactor, and the mixture is dispersed and stirred evenly to obtain a high-temperature resistant self-adhesive three-layer insulated wire material;

[0063] The preparation method of the high temperature resistant self-adhesive three-layer insulated wire comprises the following steps:

[0064] A copper conductor is selected as the core wire, and a copper round wire is drawn. The first insulating layer, the second insulating layer, the third insulating layer and the self-adhesive paint layer are coated on the outside of the copper round wire at one time, wherein the first insulating layer is a polyamide film, the second insulating layer is a high-insulation spray paint coating, the third insulating layer is a glass fiber layer, and the self-adhesive layer is the above-mentioned high-temperature resistant self-adhesive three-layer insulated wire material. The painting process is: each layer is painted in multiple coats, and after each coat, it is cross-linked and cured in the temperature range of 380±30℃, and naturally cooled after the reaction. After it is completely cured, the above painting process is repeated, and after the painting is completed and completely cured, it is formed into a wire to obtain a high-temperature resistant self-adhesive three-layer insulated wire sample.

[0065] Example 4

[0066] The preparation method of the organosilicon prepolymer comprises the following steps:

[0067] Phenyltriethoxysilane and anhydrous ethanol are added to a three-necked flask, and a stirring and heating device is installed. The mixture is stirred evenly, and dilute hydrochloric acid with a concentration of 1.0 mol / L is added to adjust the pH value of the mixture in the three-necked flask to between 3 and 5. The temperature is raised to 50° C., 10 g of deionized water is injected into a Buchner funnel and installed on the reaction device, and the mixture is slowly dripped into the three-necked flask. The addition is completed within 2 hours, and then the temperature is raised to 130° C. for polycondensation reaction for 0.5 hours. Finally, the anhydrous ethanol, residual water and low molecular weight substances are removed under reduced pressure to obtain an organosilicon prepolymer.

[0068] The preparation method of modified unsaturated polyester comprises the following steps:

[0069] 20 parts by mass of isophthalic acid, 30 parts by mass of maleic anhydride and 10 parts by mass of propylene glycol are added to a reaction kettle, the temperature is raised to 150° C. and maintained for 2 hours, then the temperature is raised to 200° C. at a rate of 10° C. / min, and the temperature is maintained until the acid value is less than 25 mgKOH / g, then the temperature is lowered to below 100° C. to obtain an unsaturated polyester prepolymer, and then the obtained organosilicon oligomer is added to the reaction system, and the temperature is raised to 120° C. to react for 1 hour, and a condensation reaction is carried out with the unsaturated polyester prepolymer to obtain a modified unsaturated polyester;

[0070] The preparation method of the modified epoxy resin comprises the following steps:

[0071] Take 10 parts by weight of bisphenol A epoxy resin and add it into a reaction kettle and heat it to 90-100° C., add 1 part by weight of bismaleimide under stirring, the reaction temperature is 90° C., the reaction time is 0.5 h, until the material is transparent, and cool it to obtain a modified epoxy resin;

[0072] The preparation method of the high temperature resistant self-adhesive three-layer insulated wire material comprises the following steps:

[0073] The modified unsaturated polyester and modified epoxy resin prepared above are added into a nitrogen-filled reaction vessel, the reaction temperature is 100-110° C., the reaction time is 1 h, and 10 parts by mass of a mixture of filler nano-silica and carbon nanotubes, 10 parts by mass of a diluent 1,4-butanediol diacrylate, 0.5 parts by mass of an initiator tert-butyl peroxyvalerate, 0.01 parts by mass of a polymerization inhibitor hydroquinone, and 10 parts by mass of a curing agent zinc isooctanoate are added into the reactor, and the mixture is dispersed and stirred evenly to obtain a high-temperature resistant self-adhesive three-layer insulated wire material;

[0074] The preparation method of the high temperature resistant self-adhesive three-layer insulated wire comprises the following steps:

[0075] A copper conductor is selected as the core wire, and a copper round wire is drawn. The first insulating layer, the second insulating layer, the third insulating layer and the self-adhesive paint layer are coated on the outside of the copper round wire at one time, wherein the first insulating layer is a polyamide film, the second insulating layer is a high-insulation spray paint coating, the third insulating layer is a glass fiber layer, and the self-adhesive layer is the above-mentioned high-temperature resistant self-adhesive three-layer insulated wire material. The painting process is: each layer is painted in multiple coats, and after each coat, it is cross-linked and cured in the temperature range of 380±30℃, and naturally cooled after the reaction. After it is completely cured, the above painting process is repeated, and after the painting is completed and completely cured, it is formed into a wire to obtain a high-temperature resistant self-adhesive three-layer insulated wire sample.

[0076] Comparative Example 1

[0077] Compared with Example 1, Comparative Example 1 omits the preparation step of the silicone prepolymer, in the preparation of the modified unsaturated polyester, after obtaining the unsaturated polyester prepolymer, the silicone prepolymer is not added to continue the reaction, and in the preparation step of the high-temperature resistant self-adhesive three-layer insulated wire material, the prepared unsaturated polyester prepolymer is directly mixed and reacted with the modified epoxy resin, and the remaining components and preparation method are completely consistent with Example 1.

[0078] Comparative Example 2

[0079] Compared with Example 1, Comparative Example 2 omits the preparation step of the modified epoxy resin. In the preparation step of the high-temperature resistant self-adhesive three-layer insulated wire material, the prepared modified unsaturated polyester is directly mixed with the unmodified epoxy resin (bisphenol A epoxy resin) for reaction. The remaining components and preparation method are exactly the same as those in Example 1.

[0080] Comparative Example 3

[0081] Compared with Example 1, in Comparative Example 3, no filler is added in the preparation step of the high-temperature resistant self-adhesive three-layer insulated wire material, and the remaining components and preparation method are completely consistent with those of Example 1.

[0082] Performance Testing

[0083] (1) Mechanical strength test: Process the sample according to GB / T2567-2021, and test the tensile strength and impact strength of the sample, record the data, and the test results are shown in Table 1;

[0084] Table 1 Test results of tensile strength and impact strength of Examples 1-4 and Comparative Examples 1-3

[0085] Tensile strength / MPa <![CDATA[Impact strength / kJ·m -2 <!-- 6 -->]]> Example 1 78.35 14.37 Example 2 78.25 14.25 Example 3 77.25 14.65 Example 4 79.76 15.34 Comparative Example 1 48.96 9.64 Comparative Example 2 54.53 11.36 Comparative Example 3 68.34 12.54

[0086] As shown in Table 1, the data of Examples 1-4 show that the tensile strength and impact strength of the obtained self-adhesive paint layer are improved by the high temperature resistant self-adhesive three-layer insulated wire material prepared by the present invention. By comparing Examples 1-4 and Comparative Examples 1-3, the tensile strength and impact strength of the samples in Examples 1-4 are greater than those in Comparative Examples 1-3, and the tensile strength and impact strength of the sample in Comparative Example 1 are the lowest, indicating that the addition of the silicone prepolymer, the modified epoxy resin and the nano-scale inorganic filler effectively improves the mechanical strength of the high temperature resistant unsaturated polyester resin and improves the toughness, and the addition of the silicone prepolymer further improves the tensile strength of the material.

[0087] (2) Heat resistance test: The sample was tested for thermal weight loss using a TG209 thermogravimetric analyzer produced by NETZSCH Instrument Manufacturing Co., Ltd., Germany. 1-5 mg of the sample was placed in a crucible and purged with nitrogen. The test temperature was 25-600°C, the heating rate was 20°C / min, and the 5% thermal decomposition temperature was recorded. The test results are shown in Table 2.

[0088] Table 2 Test results of 5% thermal decomposition temperature of Examples 1-4 and Comparative Examples 1-3

[0089]

[0090]

[0091] As shown in Table 2, from the comparison of the experimental data of Examples 1-4 and Comparative Examples 1-3, it can be found that the high temperature resistant self-adhesive three-layer insulated wire prepared by the present invention has good heat resistance. By comparison, the 5% thermal decomposition temperature of Examples 1-4 is greater than the 5% thermal decomposition temperature of Comparative Examples 1-3, indicating that the addition of the silane segment and nanofiller of the organosilicon prepolymer effectively improves the heat resistance of the high temperature resistant unsaturated polyester and delays its thermal decomposition behavior.

[0092] (3) Corrosion resistance test: The samples were immersed in 50wt% sulfuric acid solution and 20wt% sodium hydroxide solution at 80°C for 30 days, 60 days and 90 days. After immersion, they were washed with deionized water for 3 times. The surface moisture was wiped with filter paper. The weight change rate of the samples was measured and recorded. + represents increase and - represents decrease. The test results are shown in Table 3.

[0093] Table 3 Corrosion resistance test results of Examples 1-4 and Comparative Examples 1-3

[0094]

[0095] It can be seen from Table 3 that the high-temperature self-adhesive three-layer insulated wire material prepared by the present invention has good corrosion resistance. Compared with Examples 1-4 and Comparative Examples 1 and 3, in the early stage of acid immersion, it is a physical corrosion stage, the sample swells, and the weight increase of Examples 1-4 is less than the weight increase of Comparative Examples 1 and 3. In the later stage of immersion, it enters the chemical corrosion stage, and the weight reduction rate of Examples 1-4 is also less than the weight reduction rate of Comparative Examples 1 and 3. In alkali immersion, all samples quickly enter the chemical corrosion weight loss stage. In this stage, the weight reduction rate of Examples 1-4 is less than the weight reduction rate of Comparative Examples 1 and 3, indicating that the addition of the silicone prepolymer introduces the corrosion resistance of the organosilane, and the presence of the silane segment reduces the degree of acid and alkali corrosion. In addition, the introduction of nano-scale inorganic fillers also improves the corrosion resistance of the prepared high-temperature resistant self-adhesive three-layer insulated wire material.

[0096] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A high temperature resistant self-adhesive three-layer insulated wire material, characterized in that: At least the following ingredients are included: Wherein, the modified unsaturated polyester is selected from unsaturated polyester modified by a combination of one or more of methylvinylchlorosilane, vinylphenyldichlorosilane, vinyltrichlorosilane, methyltriethoxysilane, methyltrimethoxysilane or phenyltriethoxysilane or vinyltriethoxysilane, and the modified epoxy resin is selected from epoxy resin modified by a combination of one or more of N-(4-aminophenyl)maleimide, bismaleimide, ketimine or polyetherimide.

2. The high temperature resistant self-adhesive three-layer insulated wire material according to claim 1, characterized in that: The filler is one or more of medium-nano silicon dioxide, carbon nanotubes, mica powder or talc powder.

3. The high temperature resistant self-adhesive three-layer insulated wire material according to claim 1, characterized in that: The diluent is one or more of vinyl toluene, 1,4-butanediol diacrylate, diallyl phthalate, neopentyl glycol diacrylate or styrene.

4. The high temperature resistant self-adhesive three-layer insulated wire material according to claim 1, characterized in that: The initiator is one or more of dicumyl peroxide, tert-butyl perbenzoate or ethyl-3,3-di(tert-butyl peroxide)butyrate.

5. The high temperature resistant self-adhesive three-layer insulated wire material according to claim 1, characterized in that: The polymerization inhibitor is one or more of methyl hydroquinone, methyl hydroquinone, hydroquinone or 2,5-di-tert-butyl hydroquinone.

6. The high temperature resistant self-adhesive three-layer insulated wire material according to claim 1, characterized in that: The curing agent is one or more of zinc octoate, zinc naphthenate, cobalt naphthenate or calcium naphthenate.

7. A method for preparing the high temperature resistant self-adhesive three-layer insulated wire material according to any one of claims 1 to 6, characterized in that: At least the following steps are included: The organosilicon monomer is subjected to a hydrolysis condensation reaction with deionized water to obtain an organosilicon prepolymer; A saturated or unsaturated dibasic acid and / or a first acid anhydride is mixed with a diol to perform a polycondensation reaction to obtain an unsaturated polyester prepolymer, and the organosilicon prepolymer is added to the unsaturated polyester prepolymer to react to obtain a modified unsaturated polyester; The amine compound and the epoxy resin are mixed and reacted to obtain a modified epoxy resin; The modified unsaturated polyester and the modified epoxy resin are mixed and reacted, and after the reaction is completed, fillers, initiators, curing agents, polymerization inhibitors and diluents are added to the system to obtain a high temperature resistant self-adhesive three-layer insulated wire material.

8. The method for preparing a high temperature resistant self-adhesive three-layer insulated wire material according to claim 7, characterized in that: The mass ratio of the deionized water to the organosilicon monomer is 1:2.0-6.

5.

9. The method for preparing a high temperature resistant self-adhesive three-layer insulated wire material according to claim 7, characterized in that: The epoxy resin is one or more of bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin or hydrogenated bisphenol A epoxy resin, and the molar ratio of the amine compound to the epoxy resin is 1:2-3.

10. A high temperature resistant self-adhesive three-layer insulated wire, characterized in that: The high temperature resistant self-adhesive three-layer insulated wire at least comprises: Core wire; A first insulating layer, covering the outer peripheral wall of the core wire; A second insulating layer, covering an outer peripheral wall of the first insulating layer away from the core wire; a third insulating layer, covering an outer peripheral wall of the second insulating layer away from the first insulating layer; A self-adhesive paint layer is coated on the outer peripheral wall of the third insulating layer away from the second insulating layer, and the self-adhesive paint layer comprises the high temperature resistant self-adhesive three-layer insulating wire material as described in any one of claims 1-6.

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