High-cti polynaphthalene ester composite material and application thereof

Abstract

The application belongs to the technical field of insulating composite materials, and discloses a high-CTI polynaphthalene ester composite material and application thereof. The high-CTI polynaphthalene ester composite material is a three-layer composite material, which is composed of calendered polyaramid fiber paper outer layers, a polynaphthalene ester film middle layer, and calendered polyaramid fiber paper outer layers. The fiber paper outer layers and the film middle layer are bonded by a high-temperature-resistant modified acrylate composite adhesive. The high-temperature-resistant modified acrylate composite adhesive is an oily glue which is mainly composed of acrylate glue, and is modified by a polyester resin, an isocyanate prepolymer and a functional additive. The high-CTI polynaphthalene ester composite material improves the low tracking index of the conventional composite material, improves the insulation performance of the material, ensures the safety of the motor, improves the glowing wire flammability index GWFI of the material, and reduces the fire risk caused by overheating.

Description

Technical Field

[0001] This invention relates to the field of insulating composite materials technology, specifically to a high CTI polynaphthalene ester composite material and its applications. Background Technology

[0002] If motor insulation materials are exposed to dust accumulation, moisture condensation, dampness, and contaminants with positive and negative ions for extended periods, carbonized conductive circuitry can form. When voltage is applied, this can cause flashover discharge, generating electrical sparks and damaging the insulation performance. Current technologies focus on pure insulating paper and composite insulating paper for air-cooled, water-cooled, and oil-cooled applications, such as multilayer composite materials made of polyaramid fiber paper or polyester fiber nonwoven fabric combined with polyester film, polyimide film, or polynatride film. With the continuous development of new energy electric vehicle technology and the increasing acceptance of new energy vehicles in the market, the requirements for motor insulation materials are becoming increasingly stringent. Higher demands are being placed on materials' resistance to damp heat, aging, transmission oil, molding requirements, and electrical performance, which existing materials can no longer meet.

[0003] The ability of an insulating material surface to resist tracking is called tracking resistance. The Comparative Tracking Index (CTI) is a crucial reference indicator used to evaluate the electrical safety and reliability of insulating materials. The CTI value refers to the highest voltage at which the material surface can withstand 50 drops of electrolyte (0.1% ammonium chloride aqueous solution) without forming a tracking mark. A higher CTI value indicates a higher tracking resistance index and better insulation performance. CTI ≥ 600V is classified as Class 0; 400V ≤ CTI < 600V as Class 1; 250V ≤ CTI < 400V as Class 2; 175V ≤ CTI < 250V as Class 3; 100V ≤ CTI < 175V as Class 4; and CTI < 100V as Class 5. To improve the safety and reliability of electronic and electrical products, high CTI insulation paper has become an inevitable choice. The requirement of 500V CTI is becoming increasingly common and has become a development trend. Traditional pure paper or insulating composite paper can only reach about 200V, which can no longer meet the requirements of high CTI.

[0004] Compared to PET film, PEN film possesses superior heat resistance, corrosion resistance, insulation, good mechanical properties, and dimensional stability. Researching PEN film as a composite material to address the shortcomings of traditional materials can meet the requirements of new materials. Traditional motor slot insulation composite paper typically uses polyurethane adhesive, but this adhesive often struggles to overcome hydrolysis defects in high humidity environments. Furthermore, polyurethane-based adhesives tend to have lower CTI (Chemical Temperature Index) due to the presence of benzene rings. Therefore, composite materials bonded with polyurethane adhesives often fail to meet the requirements for high CTI. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide a high CTI polynatamide composite material and its application. The high CTI polynatamide composite material of this invention comprises a calendered polyaramid fiber paper layer, a polynatamide film layer, and another calendered polyaramid fiber paper layer. The paper layer and the film layer are bonded together using a dry composite multi-adhesive process with a high-temperature modified acrylate composite adhesive, effectively solving the problem of low CTI grade in the material.

[0006] To achieve the purpose of this invention, the high CTI polynatamide composite material of this invention is a three-layer composite material, namely, a calendered polyaramid fiber paper outer layer, a polynatamide film intermediate layer, and a calendered polyaramid fiber paper outer layer. The fiber paper outer layer and the film intermediate layer are bonded together by a high-temperature resistant modified acrylate composite adhesive. The high-temperature resistant modified acrylate composite adhesive is an oily adhesive made by cross-linking and modifying polyester resin and isocyanate prepolymer with acrylate adhesive as the main body and adding functional additives.

[0007] Furthermore, in some embodiments of the present invention, the calendered polyaramid fiber paper is polyaramid paper that has undergone a calendering process, abbreviated as aramid paper, such as DuPont's NOMEX insulating paper, such as 410, 416, and 464 paper, and Yantai Minshida's 510W, 564, and 516 paper. The thickness of the calendered polyaramid fiber paper is 0.03-0.20 mm, with typical thicknesses of 0.04 mm, 0.05 mm, 0.08 mm, 0.13 mm, and 0.18 mm; preferably 410 paper is 0.05 mm thick and 510W paper is 0.05 mm thick.

[0008] Furthermore, in some embodiments of the present invention, the intermediate layer of the polynatrimethylene film is a polyethylene naphthalate film, abbreviated as polynatrimethylene (PEN). Due to its naphthalene ring structure, PEN has better chemical stability than PET, such as DuPont Teijin Teonex Q51. The thickness of the intermediate layer of the polynatrimethylene film is 0.04-0.13 mm, with typical thicknesses being 0.05 mm, 0.075 mm, 0.1 mm, and 0.125 mm, and preferred thicknesses being 0.075 mm and 0.1 mm.

[0009] The acrylic resin main body described in this invention is a solvent-based polymer resin with reactive functional groups of hydroxyl groups. The hydroxyl groups can undergo cross-linking reactions with isocyanate groups under certain conditions to improve the material's resistance. Examples of such hydroxyl acrylic resins include AC1010F resin from Tongde Chemical Co., Ltd., KASTER hydroxyl acrylic resin HAR863 from Kunshan Castel Polymer Materials Co., Ltd., and oil-based hydroxypropyl 830A resin from Jiangyin Liren Chemical Co., Ltd.

[0010] Furthermore, in some embodiments of the present invention, the high-temperature resistant modified acrylate composite adhesive has a temperature resistance rating of H or higher, and is applied after being diluted with a diluent; preferably, the diluent is one or more mixtures of acetone, ethyl acetate, butanone, methyl acetate, and toluene; preferably, the diluent is a combination of methyl acetate and butanone, and more preferably, the mass ratio of methyl acetate to butanone is 2:3 to 7, for example, 2:3.5 to 5.7.

[0011] Furthermore, in some embodiments of the present invention, the polyester resin is a polyester adduct that mainly provides hydroxyl (OH) functional reactive sites and is a macromolecular polyester adduct, such as COLFLEX HP8060, LOCTIFE LA2716, LIS7059, preferably LIS7059.

[0012] Furthermore, in some embodiments of the present invention, the isocyanate prepolymer is a linear isocyanate adduct, which mainly provides isocyanate-based NCO functional reactive sites, such as KS100 and LCR1051.

[0013] Furthermore, in some embodiments of the present invention, the functional additive is an inorganic filler selected from one or more of nano-silica, nano-hydrated alumina, ceramicized zinc borate, and magnesium hydroxide. The present invention, through the use of functional additives, can improve the chemical and electrical properties of polymers, such as increasing modulus, accelerating heat transfer, and assisting in flame retardancy. It can also improve the tracking index of the material and possesses particularly excellent flame retardancy itself.

[0014] Furthermore, in some embodiments of the present invention, the compounding method employs a coupling agent.

[0015] Furthermore, in some embodiments of the present invention, the coupling agent is selected from silane coupling agents and titanate coupling agents.

[0016] Preferably, in some embodiments of the present invention, the coupling agent is a silane coupling agent, such as vinyltriethoxysilane A151, vinyltris(β-methoxyethoxy)silane A172, and 3-glycidyl etheroxypropyltrimethoxysilane KH-560.

[0017] Preferably, in some embodiments of the present invention, the coupling agent is a titanate coupling agent, such as a monoalkoxy type, a monoalkoxy pyrophosphate type, an integrated type, and a ligand type, etc. Preferably, the coupling agent is 3-glycidyl etheroxypropyltrimethoxysilane.

[0018] Furthermore, in some embodiments of the present invention, the functional additives are used in a certain range of operating proportions. Too little will not have an obvious effect and will not achieve the effect of improving CTI. Too much will result in uneven dispersion. The appropriate proportions are that the mass percentages of the functional additives and coupling agents to the resin components are 8-20% and 0.5-3%, respectively.

[0019] Furthermore, in some embodiments of the present invention, the mass ratio of hydroxyl acrylate resin, polyester resin, isocyanate prepolymer, and diluent in the high-temperature resistant modified acrylate composite adhesive is 20:5-16:4-12:50-95. Preferably, the mass ratio of hydroxyl acrylate resin, polyester resin, isocyanate prepolymer, and diluent is 20:10-12:6-9:60-75.

[0020] Furthermore, in some embodiments of the present invention, the outer layer of the fiber paper and the middle layer of the film are bonded together by a special process using a high-temperature resistant modified acrylic composite adhesive. The special process requires pretreatment of the paper layer, which involves applying a polyester resin coating to the surface. The coating process involves applying a thin layer of polyester resin (2-5g / square meter) to one side of the paper and a relatively thick layer of polyester resin (10-15g / square meter) to the other side. Preferably, the drying process for the coating is 45°C-60°C-75°C-85°C.

[0021] Furthermore, in some embodiments of the present invention, the amount of adhesive applied is 30-40g per square meter to ensure that the adhesive does not penetrate into the paper layer. Traditional adhesives with an amount exceeding 15g may have the risk of penetration, leading to the unwinding and tearing of the insulating paper.

[0022] Furthermore, in some embodiments of the present invention, the bonding process is as follows:

[0023] (1) After coating one side of the intermediate polynatride film with adhesive, a P layer is obtained. This P layer is then combined with a paper layer Y layer on the side with a thick coating to obtain YP. The composite drying process is 55℃~65℃~80℃~95℃.

[0024] (2) The side of the uncoated polynatride film from step (1) is coated again in step (1), dried in an oven, and then laminated with another paper side that has undergone surface treatment and has a relatively thick coating to obtain a YPY layer. Then, it is cured in a curing chamber. Preferably, the curing process is 90-100°C for 72-120 hours. More preferably, the curing process is 95°C for 96 hours.

[0025] Furthermore, in some embodiments of the present invention, the coating process of the composite adhesive is a dry lamination process. The dry lamination process involves diluting and dissolving the composite adhesive with a diluent to a suitable coating concentration and viscosity, transferring it to both sides of a polynaphthalene film substrate via a coating device, removing the solvent by heating in an oven, hot-pressing it with a surface-treated paper layer, and finally entering a curing chamber for high-temperature reaction to obtain a composite insulating material. Furthermore, the coating concentration (the proportion of non-volatile components to the mass ratio of non-volatile components to volatile components) is 28% to 42%, and the viscosity is 11 to 28S (coating cup #4 test).

[0026] On the other hand, the present invention also provides an application of the aforementioned high CTI polynaphthalene ester composite material, wherein the application is to use the high CTI polynaphthalene ester composite material in a new energy motor.

[0027] Compared with the prior art, the advantages of the present invention are as follows:

[0028] (1) The high CTI polynaphthalene ester composite material of the present invention uses acrylic modified adhesive. The acrylic modified adhesive is cross-linked and modified by polyester resin and isocyanate prepolymer, and compounded with functional compounding additives. This overcomes the defect of low CTI of the polyurethane-based adhesive, and also improves the glow wire flammability index GWFI, reducing the fire risk caused by overheating and active ignition.

[0029] (2) The high CTI polynaphthalene ester composite material of the present invention includes a calendered polyaramid fiber paper layer, a polynaphthalene ester film layer, and a calendered polyaramid fiber paper layer. The paper layer and the film layer are bonded together by a dry composite multi-adhesive process using modified composite adhesive, which takes into account the mechanical and electrical properties of the film layer as well as the flexibility and aging resistance of the paper layer.

[0030] (3) The high CTI polynaphthalene ester composite material of the present invention is used in new energy motors. It is easy to thermoform in the slot insulation of new energy motors, which extends the service life of the material and provides better protection for the motor. Attached Figure Description

[0031] Figure 1 This is a simplified structural diagram of the high CTI polynaphthalene ester composite material of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. It should be understood that the following description is merely illustrative and not intended to limit the invention.

[0033] The terms “comprising,” “including,” “having,” “containing,” or any other variations thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0034] The conjunction "composed of..." excludes any unspecified elements, steps, or components. If used in a claim, this phrase makes the claim closed, excluding materials other than those described, except for associated conventional impurities. When the phrase "composed of..." appears in a clause of the body of a claim rather than immediately following it, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0035] When a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1 to 5” is disclosed, the described range should be interpreted as including the ranges “1 to 4”, “1 to 3”, “1 to 2”, “1 to 2 and 4 to 5”, “1 to 3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.

[0036] The indefinite articles “a” and “an” preceding an element or component of this invention do not impose any limitation on the quantity (i.e., number of times) of the element or component. Therefore, “an” or “a” should be interpreted as including one or at least one, and the singular form of an element or component also includes the plural form, unless the quantity clearly refers only to the singular form.

[0037] Furthermore, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., described below refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms are not necessarily directed at the same embodiment or example. Moreover, the technical features involved in the various embodiments of the present invention can be combined with each other as long as they do not conflict with each other.

[0038] The heat resistance test requirement for the insulating composite material is that it can withstand the test without delamination, bubbling, or glue leakage, and the condition is 200℃ / 72H.

[0039] The damp heat resistance test conditions involve subjecting the material to damp heat treatment at 120°C and 100% RH for 500 hours, followed by a peel strength test. The standard is GB / T 2790—1995 "Adhesives 180° Peel Strength Test Method: Flexible Materials vs. Rigid Materials". A peel strength greater than 2 N / cm is considered sufficient to determine if the material passes the damp heat resistance test.

[0040] The standard for determining the relative tracking index (CTI) of the insulating material is GB / T4207-2012 "Determination of Tracking Resistance Index and Relative Tracking Index of Solid Insulating Materials GB / T 4207-2012"; the standard for determining the glow wire flammability index (GWFI) is GB / T5169.11-2006 "Fire Hazard Tests for Electrical and Electronic Products - Part 11: Basic Test Method for Glow Wire".

[0041] Example 1

[0042] First, a polyester coating is applied to both sides of a 0.05mm thick aramid paper 410 to obtain a thin coating of 3g adhesive per square meter on one side and a thick coating of 10g adhesive per square meter on the other side. Then, a composite adhesive is applied to the surface of a polynatride film. The composite adhesive consists of 20 parts acrylic resin, 11 parts polyester resin, 7 parts isocyanate resin, 6 parts hydrated alumina nanoparticles, 0.76 parts coupling agent KH560, and methyl acetate and butanone in a mass ratio of 2:5, for a total of 70 parts. After drying, the adhesive on the polynatride film surface is laminated with the 10g thick coating on the paper surface to obtain a YP structure product. Then, the other side of the polynatride film of the YP structure semi-finished product is laminated with another thick-coated paper surface to obtain a YPY composite material. After curing, an insulating composite material with a thickness of 0.25mm is obtained.

[0043] Tests showed that the composite material had a CTI value of 550V, class 1, a glow wire flammability index (GWFI) of 850℃, passed the temperature resistance test at 200℃ for 72 hours, and had a peel strength of 4.3 N / cm in the damp heat resistance test.

[0044] Example 2

[0045] First, a polyester coating is applied to both sides of a 0.05mm thick aramid paper 410 to obtain a thin coating of 3g adhesive per square meter on one side and a thick coating of 10g adhesive per square meter on the other side. Then, a composite adhesive is applied to the surface of a polynatride film. The composite adhesive consists of 20 parts acrylic resin, 11 parts polyester resin, 7 parts isocyanate resin, 4 parts nano-hydrated alumina, 2 parts ceramicized zinc borate, 0.76 parts coupling agent KH560, and 70 parts methyl acetate and butanone in a 2:5 mass ratio. After drying, the adhesive on the polynatride film surface is laminated with the 10g thick coating on the paper surface to obtain a YP structure product. Then, the other side of the polynatride film of the YP structure semi-finished product is laminated with another thick-coated paper surface to obtain a YPY composite material. After curing, an insulating composite material with a thickness of 0.25mm is obtained.

[0046] Tests showed that the composite material had a CTI value of 600V, class 0, a glow wire flammability index (GWFI) of 850℃, passed the temperature resistance test at 200℃ for 72 hours, and had a peel strength of 5.2 N / cm in the damp heat resistance test.

[0047] Example 3

[0048] First, a polyester coating is applied to both sides of a 0.05mm thick aramid paper 410 to obtain a thin coating of 3g adhesive per square meter on one side and a thick coating of 10g adhesive per square meter on the other side. Then, a composite adhesive is applied to the surface of a polynatride film. The composite adhesive consists of 20 parts acrylic resin, 11 parts polyester resin, 7 parts isocyanate resin, 6 parts ceramicized zinc borate, 0.76 parts coupling agent KH560, and 70 parts methyl acetate and butanone in a 2:5 mass ratio. After drying, the adhesive on the polynatride film surface is laminated with the 10g thick coating on the paper surface to obtain a YP structure product. Then, the other side of the polynatride film of the YP structure semi-finished product is laminated with another thick-coated paper surface to obtain a YPY composite material. After curing, an insulating composite material with a thickness of 0.25mm is obtained.

[0049] Tests showed that the composite material had a CTI value of 500V, class 1, a glow wire flammability index (GWFI) of 750℃, passed the temperature resistance test at 200℃ for 72 hours, and had a peel strength of 3.9 N / cm in the damp heat resistance test.

[0050] Comparative Example 1

[0051] First, a polyester coating is applied to both sides of a 0.05mm thick aramid paper 410 to obtain a thin coating of 3g adhesive per square meter on one side and a thick coating of 10g adhesive per square meter on the other side. Then, a composite adhesive is applied to the surface of a polynatride film. The composite adhesive consists of 20 parts acrylic resin, 11 parts polyester resin, 7 parts isocyanate resin, 6 parts ceramicized zinc borate, 0.76 parts coupling agent KH560, and methyl acetate and butanone in a mass ratio of 2:5, for a total of 120 parts. After drying, the adhesive on the polynatride film surface is laminated with the 10g thick coating on the paper surface to obtain a YP structure product. Then, the other side of the polynatride film of the YP structure semi-finished product is laminated with another thick-coated paper surface to obtain a YPY composite material. After curing, an insulating composite material with a thickness of 0.23mm is obtained.

[0052] Tests showed that the composite material had a CTI value of 350V, which is level 2; a glow wire flammability index (GWFI) of 750℃; passed the temperature resistance test at 200℃ for 72 hours; and had a peel strength of 3.9 N / cm in the damp heat resistance test.

[0053] Comparative Example 2

[0054] First, a polyester coating is applied to both sides of a 0.05mm thick aramid paper 410 to obtain a thin coating of 3g adhesive per square meter on one side and a thick coating of 10g adhesive per square meter on the other side. Then, a composite adhesive is applied to the surface of a polynatride film. The composite adhesive consists of 20 parts acrylic resin, 7 parts isocyanate resin, 6 parts ceramicized zinc borate, 0.76 parts coupling agent KH560, and 70 parts methyl acetate and butanone in a 2:5 mass ratio. After drying, the adhesive on the polynatride film surface is laminated with the 10g thick coating on the paper surface to obtain a YP structure product. Then, the other side of the polynatride film of the YP structure semi-finished product is laminated with another thick-coated paper surface to obtain a YPY composite material. After curing, an insulating composite material with a thickness of 0.24mm is obtained.

[0055] The composite material was tested and found to have a CTI value of 400V (Level 2), a glow wire flammability index (GWFI) of 750℃, passed the temperature resistance test at 200℃ for 72 hours, and had a peel strength of 3.1 N / cm in the damp heat resistance test.

[0056] Comparative Example 3

[0057] First, a polyester coating is applied to both sides of a 0.05mm thick aramid paper 410 to obtain a thin coating of 3g adhesive per square meter on one side and a thick coating of 10g adhesive per square meter on the other side. Then, a composite adhesive is applied to the surface of a polynatride film. The composite adhesive consists of 20 parts acrylic resin, 11 parts polyester resin, 6 parts hydrated alumina nanoparticles, 0.76 parts coupling agent KH560, and 70 parts methyl acetate and butanone in a 2:5 mass ratio. After drying, the adhesive on the polynatride film surface is combined with the 10g thick coating on the paper surface to obtain a YP structure product. Then, the other side of the polynatride film of the YP structure semi-finished product is combined with another thick-coated paper surface to obtain a YPY composite material. After curing, an insulating composite material with a thickness of 0.25mm is obtained.

[0058] The composite material was tested and found to have a CTI value of 400V, which is level 2. The glow wire flammability index (GWFI) was 750℃. The temperature resistance test showed blistering and delamination after 72 hours at 200℃, which was deemed a failure. The peel strength in the damp heat resistance test was 1.8 N / cm.

[0059] Comparative Example 4

[0060] First, a polyester coating is applied to both sides of a 0.05mm thick aramid paper 410 to obtain a thin coating of 3g adhesive per square meter on one side and a thick coating of 10g adhesive per square meter on the other side. Then, a composite adhesive is applied to the surface of a polynatride film. The composite adhesive consists of 20 parts acrylic resin, 11 parts polyester resin, and 7 parts isocyanate resin. The mass ratio of methyl acetate to methyl ethyl ketone is 2:5, and the total amount added is 70 parts. After the adhesive on the surface of the polynatride film is dried, it is laminated with the 10g thick coating on the paper surface to obtain a YP structure product. Then, the other side of the polynatride film of the YP structure semi-finished product is laminated with another thick-coated paper surface to obtain a YPY composite material. After curing, an insulating composite material with a thickness of 0.25mm is obtained.

[0061] Tests showed that the composite material had a CTI value of 200V, which is level 3; a glow wire flammability index (GWFI) of 550℃ (failed); a temperature resistance test of 200℃ for 72 hours (passed); and a peel strength of 3.3 N / cm in the damp heat resistance test.

[0062] Comparative Example 5

[0063] First, a composite adhesive is coated on the surface of a polynatride film. The composite adhesive consists of 20 parts acrylic resin, 11 parts polyester resin, 7 parts isocyanate resin, 6 parts hydrated alumina nanoparticles, 0.76 parts coupling agent KH560, and 70 parts methyl acetate and butanone in a mass ratio of 2:5. After drying, the adhesive on the surface of the polynatride film is bonded to 0.05 mm thick aramid paper 410 to obtain a YP structure product. Then, the polynatride film of the YP structure semi-finished product is bonded to another surface to obtain a YPY composite material. After curing, an insulating composite material with a thickness of 0.25 mm is obtained.

[0064] Tests showed that the composite material had a CTI value of 350V, which is level 2; a glow wire flammability index (GWFI) of 750℃; passed the temperature resistance test at 200℃ for 72 hours; and had a peel strength of 3.7 N / cm in the damp heat resistance test.

[0065] Those skilled in the art will readily understand that the above description is merely an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high CTI polynaphthalene ester composite material, characterized in that, The high-CTI polynaphthalene ester composite material is a three-layer composite material, which is respectively a calendered polyaramid fiber paper outer layer, a polynaphthalene ester film intermediate layer and a calendered polyaramid fiber paper outer layer, and the fiber paper outer layer and the film intermediate layer are bonded by a high-temperature-resistant modified acrylic composite adhesive, the high-temperature-resistant modified acrylic composite adhesive is an oily adhesive prepared by taking an acrylic adhesive as a main body, cross-linking modification of polyester resin and isocyanate prepolymer and compounding of a functional additive; The high-temperature-resistant modified acrylic composite adhesive has a temperature resistance grade of H level or above, is diluted by a diluent and then is coated, the functional additive is an inorganic filler selected from one or more of nano silicon dioxide, nano hydrated aluminum oxide, ceramic zinc borate and magnesium hydroxide, the compounding method is coupling agent treatment, and the mass ratio of the hydroxyl acrylic ester resin, the polyester resin, the isocyanate prepolymer and the diluent in the high-temperature-resistant modified acrylic composite adhesive is 20:5-16:4-12:50-95; the fiber paper outer layer and the film intermediate layer are bonded by the high-temperature-resistant modified acrylic composite adhesive through a special process, the special process needs pretreatment of the paper layer, the pretreatment is a polyester resin coating treatment on the surface, and the coating treatment is that 2-5 g of thin polyester resin coating per square meter is coated on one side of the paper and 10-15 g of relatively thick polyester resin coating per square meter is coated on the other side.

2. The high CTI polynaphthalene ester composite according to claim 1, wherein, The diluent is a mixture of one or more of acetone, ethyl acetate, butanone, methyl acetate and toluene.

3. The high CTI polynaphthalene ester composite of claim 1, wherein, The diluent is a mixture of methyl acetate and butanone.

4. The high CTI polynaphthalene ester composite of claim 3, wherein, The mass ratio of the methyl acetate and the butanone is 2:3-7.

5. The high CTI polynaphthalene ester composite of claim 3, wherein, The mass ratio of the methyl acetate and the butanone is 2:3.5-5.

7.

6. The high CTI polynaphthalene ester composite of claim 1, wherein, The coupling agent is selected from silane coupling agents and titanate coupling agents.

7. The high CTI polynaphthalene ester composite of claim 1, wherein, The mass ratio of the hydroxyl acrylic ester resin, the polyester resin, the isocyanate prepolymer and the diluent is 20:10-12:6-9:60-75.

8. The high CTI polynaphthalene ester composite of claim 1, wherein, The bonding process is as follows: (1) one side of the intermediate polynaphthalene ester film is coated to obtain a P layer, the P layer is combined with a Y layer of the paper layer with a thick coating on the surface to obtain YP, and the combination drying process is 55-65-80-95 ℃; (2) the other side of the polynaphthalene ester film in step (1) is coated again, and after drying in an oven, the other side is combined with the paper layer with a thick coating on the surface to obtain a YPY layer, and then the YPY layer is cured in a curing room.

9. The high CTI polynaphthalene ester composite according to claim 8, wherein, The curing process is 90-100 ℃ / 72-120 H.

10. The high CTI polynaphthalene ester composite of claim 8, wherein, The curing process is 95 ℃ for 96 H.

11. The high CTI polynaphthalene ester composite of claim 1, wherein, The coating process of the adhesive is a dry combination process, the dry combination process is that the adhesive is diluted by a diluent to a suitable coating concentration and viscosity, transferred to the front and back surfaces of the polynaphthalene ester film substrate by a coating device, heated in an oven to remove the solvent, combined with the paper layer after surface treatment by hot pressing, and finally put into a curing room for reaction to obtain a combined structure of the insulating material.

12. Use of the high CTI polynaphthalene ester composite according to any one of claims 1 to 11, characterized in that, The application is that the high-CTI polynaphthalene ester composite material is used on a new energy motor.

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