Insulation type composite material, preparation method and application

Abstract

The invention discloses an insulating composite material, a preparation method and application, and relates to the technical field of engineering materials, the method comprises the following steps: (1) mica treatment; (2) primary surface modification of mica; (3) carrying out deep surface modification and bonding treatment on mica; and (4) cooling and granulating. Natural mica or modified mica is used as a raw material, a binder, a filling agent and a reinforcing agent in a specific proportion are matched, and the insulation type mica synthetic material is obtained through molding under the conditions of high temperature and high pressure. According to the material, the electrical insulation property and the mechanical property of the material are remarkably improved through optimization design of a mica structure and improvement of a synthesis process. The material disclosed by the invention shows excellent performance in the aspects of insulating property and compressive strength, is suitable for the fields of electronic components, building materials, high-performance composite materials and the like, and overcomes the problems of insufficient mechanical property, high brittle rupture tendency and the like of the traditional mica material at the same time. The preparation method is simple in process and low in cost, and the product is easy to produce on a large scale and has a wide application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering materials, and in particular to an insulating composite material, a preparation method and application thereof. Background Art

[0002] As the cornerstone of modern industry, the performance of engineering materials directly affects the reliability of various equipment and projects. Especially in the fields of aerospace, electronics and electrical, construction and transportation, the performance requirements of materials are becoming increasingly diversified, requiring materials to not only have high strength, but also to remain stable under extreme conditions such as high temperature, corrosion and impact. Engineering plastic materials represented by engineering plastic alloy ABS are widely used in industrial production due to their good comprehensive performance and easy processing. However, existing engineering plastics have exposed many defects in practical applications. On the one hand, their mechanical properties are difficult to meet the needs of high-intensity loads, and the materials are prone to deformation, cracking and other failure problems during use; on the other hand, the high temperature resistance of engineering plastics is relatively limited, and the heat deformation temperature is usually not more than 100°C, which makes them unable to work stably in high temperature environments. In addition, the electrical insulation performance of engineering plastics will significantly decrease under complex conditions such as humidity and heat, limiting their use scenarios in high-performance electronic devices. At the same time, many high-performance plastics rely on complex chemical synthesis, have high production costs, and are difficult to achieve green environmental protection goals, which puts pressure on environmental sustainable development.

[0003] In response to the above problems, researchers have gradually turned their attention to natural mineral materials, hoping to achieve comprehensive performance improvements by introducing them into the field of engineering materials (SZADKOWSKI B, MARZEC A, RYBIŃSKI P, et al. Characterization of ethylene–propylene composites filled with perlite andvermiculite minerals: mechanical, barrier, and flammability properties[J]. Materials, Multidisciplinary Digital Publishing Institute, 2020, 13(3):585.). Natural mica has great potential in the field of materials science due to its unique layered structure and excellent physical and chemical properties. Mica not only has the characteristics of high strength and high rigidity, but its lamellar structure can also form a reinforced network in the composite material, thereby significantly improving the mechanical properties of the material.

[0004] In addition, mica's natural high temperature resistance enables it to work stably for a long time in an environment above 600°C, making it suitable for applications in extreme working conditions such as aerospace and automotive engines. Mica's excellent electrical insulation remains stable and reliable under high voltage and high humidity conditions, which makes it possible to be used in electronic components and high-voltage power equipment. More importantly, as a natural mineral, the mining and processing of mica has little impact on the environment, and the waste generated during its processing is easy to recycle and treat, which meets the environmental protection needs of modern material development.

[0005] In recent years, the research and development of mica-based composite materials has made important progress. Existing research and patent results have shown that the comprehensive performance of the material can be significantly improved by surface modification of mica powder and optimized compounding with different substrates. For example, by compounding epoxy resin with modified mica powder, not only the mechanical strength of the material is improved, but also its heat resistance is significantly improved, meeting the engineering needs under high temperature conditions. Luo Shunjie (Luo Shunjie, Chen Yang, Li Zhaoheng, et al. Study on the wear resistance and enhancement mechanism of sericite / epoxy resin composite coating [J]. Guangdong Water Resources and Hydropower, 2023, (8): 58–62.) et al. prepared a sericite / epoxy resin composite coating. The results showed that the addition of sericite will enhance the waterproof performance and wear resistance of the epoxy coating and reduce its thermal conductivity. Its effect on epoxy resin is physical. When the sericite content is 9%, the contact angle of the composite coating is 82.1°, and the maximum water absorption after polishing is 1.03%. The waterproof and wear-resistant properties of the sericite / epoxy resin composite coating are the best. In addition, insulating mica synthetic materials have shown good application prospects in fireproof panels in the construction field, high-temperature seals in aerospace, and electrical insulation films in the electronics industry. Ma Wenting (Ma Wenting, Zhao Min, Sun Junli. Study on the effect of sericite filler on the performance of boron phenolic fire retardant coatings [J]. Fire Science and Technology, 2020, 39(11):1577–1580.) et al. prepared a fire retardant coating with boron phenolic resin and epoxy resin as the base resin, melamine and hexamethylenetetramine as fire retardant additives, and sericite filler. The results show that the addition of sericite increases the initial decomposition temperature of boron phenolic fire retardant coatings, and as the amount of sericite added increases, the initial decomposition temperature of the coating increases. When the amount of sericite added is 20.0%, the initial decomposition temperature rises significantly to 128.3°C. These studies further demonstrate the potential of mica composites in breaking through the performance bottleneck of traditional engineering plastics.

[0006] Under this background, the present invention proposes an insulating mica synthetic material based on natural mica.

[0007] The invention specifically relates to a method for preparing an insulating composite material. Summary of the invention

[0008] The present invention provides an insulating composite material, a preparation method and an application thereof, which exhibit excellent performance in terms of insulation performance and compressive strength, and is suitable for the fields of electronic components, building materials and high-performance composite materials, while overcoming the problems of insufficient mechanical properties and easy brittle cracking of traditional mica materials.

[0009] According to one aspect of the present disclosure, a method for preparing an insulating composite material is provided, the method comprising the following steps: (1) Mica treatment: Treating mica powder with a fineness of 200 to 2000 mesh with acid, wherein the acid used in the acid treatment is one or more of nitric acid, hydrochloric acid or sulfuric acid, the acid concentration is 5% to 30%, the treatment time is 0.5 to 5 hours, and after the treatment, washing with deionized water for 3 to 7 times, each washing time is 10 to 30 minutes, and drying at 60° C. to 120° C. for 3 to 12 hours for use; (2) Initial surface modification of mica: Heat the high-speed mixer to 40 to 120°C, add 8 to 53% by weight of mica powder, 0.5 to 15% by weight of additives, 0.1 to 11% by weight of plasticizers, and 1 to 15% by weight of grease, and mix at high speed for 3 to 60 minutes to perform preliminary dispersion and surface modification treatment; (3) Mica deep surface modification and bonding treatment: Add 15% to 70% of a binder, 0.1% to 8% of an additive, 0.5% to 5% of a reinforcing agent, and 1% to 5% of a crosslinking agent to the modified mica obtained in step (2), raise the temperature to 70° C. to 140° C., and mix at a high speed for 6 minutes to 55 minutes to complete the deep surface modification treatment and bonding; (4) Cooling and granulation: The material obtained in step (3) is taken out and cooled and stirred for 10 to 30 minutes. After the material temperature drops to 30° C., it is granulated by a granulator to obtain insulating mica synthetic material particles.

[0010] In a possible implementation, the binder includes one or more of polypropylene, nylon, polyoxymethylene, polyvinyl acetate, polyurethane, phenolic resin, polyethylene terephthalate, and polycarbonate.

[0011] In a possible implementation, the additive includes one or more of a coupling agent, a compatibilizer, an antioxidant, a plasticizer, a catalyst, a cross-linking agent, a flame retardant, a UV absorber, an antistatic agent, and a light stabilizer.

[0012] In a possible implementation, the coupling agent includes one or more of a silane coupling agent, a titanate coupling agent, a zirconate coupling agent, an aluminate coupling agent, and a rare earth coupling agent.

[0013] In a possible implementation, the compatibilizer includes one or more of maleic anhydride grafted polymer, epoxide, acrylic polymer, and styrene-maleic anhydride copolymer.

[0014] In a possible implementation, the plasticizer includes one or more of polyether, modified rubber, dibutyl phthalate, and dioctyl adipate.

[0015] In a possible implementation, the lubricating grease includes one or more of polyethylene wax, liquid paraffin, stearate, polytetrafluoroethylene powder, and complex calcium-based lubricating grease; The flame retardant includes one or more of nitrogen flame retardant, phosphorus flame retardant, flame retardant 101, halogen-free flame retardant, magnesium hydroxide, and intumescent flame retardant; Among them, nitrogen-based flame retardants include melamine derivatives; phosphorus-based flame retardants include ammonium polyphosphate and phosphate esters.

[0016] In a possible implementation, the reinforcing agent is one or more of glass fiber, protein clay, carbon black, montmorillonite, glass microbeads, and silicon carbide fiber; The cross-linking agent is one or more of boron trifluoride, hexamethylenetetramine, benzoyl peroxide, and divinylbenzene; The granulation temperature is 100°C to 300°C.

[0017] An insulating composite material is prepared according to the preparation method to obtain an insulating mica composite material.

[0018] An application of an insulating composite material, wherein the insulating mica synthetic material is used in the preparation of electrical insulation, building fireproof materials, electronic packaging materials or high-performance composite materials.

[0019] Compared with the prior art, the present invention has the following beneficial effects: The insulating composite material, preparation method and application of the disclosed embodiments, by scientifically designing the ratio of mica powder to reinforcing agent and binder, and optimizing the hot pressing molding process, the material of the present invention significantly improves the electrical insulation and mechanical properties, while having the characteristics of low cost and environmental friendliness. This material not only overcomes the shortcomings of traditional engineering plastics, but also provides new ideas for the research and development of high-performance engineering materials. In the future, this material is expected to play an important role in electronic components, high-performance building components and new energy fields.

[0020] The electrical insulation and mechanical properties of this material are significantly improved by optimizing the design of the mica structure and improving the synthesis process. The preparation method includes: using natural mica or modified mica as raw materials, mixing a specific proportion of a binder, a filler and a reinforcing agent, and molding under high temperature and high pressure conditions to obtain an insulating mica synthetic material. The material of the present invention exhibits excellent performance in terms of insulation performance and compressive strength, and is suitable for the fields of electronic components, building materials and high-performance composite materials. At the same time, it overcomes the problems of insufficient mechanical properties and easy brittle cracking of traditional mica materials. The preparation method of the present invention has a simple process and low cost, and the product is easy to mass produce, and has broad application prospects.

[0021] The preparation method of the insulating mica synthetic material in the disclosed embodiment significantly improves the electrical insulation performance of the mica material by optimizing the preparation process and raw material ratio, and can meet the application requirements of high-demand engineering fields. The modified mica material has good dispersibility and bonding force in the composite material, can improve the overall performance of the composite material, and is suitable for the manufacture of more high-performance materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A flowchart of a method for preparing an insulating composite material according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0023] The present invention is not limited by the following embodiments, and the specific implementation method can be determined according to the technical scheme of the present invention and the actual situation. Unless otherwise specified, the various chemical reagents and chemicals mentioned in the present invention are all chemical reagents and chemicals known and used in the prior art; unless otherwise specified, the percentages in the present invention are all mass percentages; unless otherwise specified, the solutions in the present invention are all aqueous solutions with water as the solvent, for example, hydrochloric acid solution is a hydrochloric acid aqueous solution; the normal temperature and room temperature in the present invention generally refer to a temperature of 15°C to 25°C, and are generally defined as 25°C.

[0024] The present invention will be further described below in conjunction with embodiments: Embodiment 1: A method for preparing an insulating mica synthetic material, comprising the following steps: (1) S01, mica treatment: The mica powder with a fineness of 200 mesh to 2000 mesh is treated with acid, wherein the acid is one or more of nitric acid, hydrochloric acid or sulfuric acid, the acid concentration is 5% to 30%, and the treatment time is 0.5h to 5h. After the treatment, it is washed with deionized water for 3 to 7 times, each washing time is 10min to 30min, and after washing, it is dried at 60℃ to 120℃ for 3h to 12h for use.

[0025] (2) S02, initial surface modification of mica: Heat the high-speed mixer to 40 to 120°C, add 8% to 53% mica powder, 0.5% to 15% additives, 0.1% to 11% plasticizer and 1% to 15% grease, and mix at high speed for 3 to 60 minutes for preliminary dispersion and surface modification.

[0026] (3) S03, mica deep surface modification and bonding treatment: Add 15% to 70% of a binder, 0.1% to 8% of an additive, and 1% to 5% of a crosslinking agent to the modified mica obtained in step (2), raise the temperature to 70°C to 140°C, and mix at a high speed for 6 min to 55 min to complete the deep surface modification treatment and bonding.

[0027] (4) S04, cooling and granulation: The material obtained in step (3) is taken out and cooled and stirred for 10 to 30 minutes. After the material temperature drops to 30° C., granulation is performed by a granulator in a conventional manner to obtain insulating mica synthetic material particles.

[0028] Embodiment 2: As an optimization of the above embodiment, the binder is one or more of nylon, polyoxymethylene, polyvinyl acetate, polyurethane, phenolic resin, polyethylene terephthalate, and polycarbonate.

[0029] Embodiment 3: As an optimization of the above embodiment, the additive is one or more of a coupling agent, a compatibilizer, an antioxidant, a plasticizer, a catalyst, a cross-linking agent, a flame retardant, a UV absorber, an antistatic agent, and a light stabilizer.

[0030] Embodiment 4: As an optimization of the above embodiment, the coupling agent is one or more of a silane coupling agent, a titanate coupling agent, a zirconate coupling agent, an aluminate coupling agent, and a rare earth coupling agent.

[0031] Embodiment 5: As an optimization of the above embodiment, the compatibilizer is one or more of maleic anhydride grafted polymer, epoxide, acrylic polymer, and styrene-maleic anhydride copolymer.

[0032] Embodiment 6: As an optimization of the above embodiment, the plasticizer is one or more of polyether, modified rubber, dibutyl phthalate, and dioctyl adipate.

[0033] Embodiment 7: As an optimization of the above embodiment, the lubricating grease is one or more of polyethylene wax, liquid paraffin, stearate, polytetrafluoroethylene powder, and complex calcium-based lubricating grease.

[0034] Embodiment 8: As an optimization of the above embodiment, the flame retardant is one or more of nitrogen-based flame retardants (such as melamine derivatives), phosphorus-based flame retardants (such as ammonium polyphosphate, phosphates), flame retardant 101, halogen-free flame retardants, magnesium hydroxide, and intumescent flame retardants.

[0035] Embodiment 9: As an optimization of the above embodiment, the reinforcing agent is one or more of glass fiber, protein clay, carbon black, montmorillonite, glass microbeads, and silicon carbide fiber.

[0036] Example 10: As an optimization of the above example, the cross-linking agent is one or more of boron trifluoride, hexamethylenetetramine, benzoyl peroxide, and divinylbenzene.

[0037] Embodiment 11: As an optimization of the above embodiment, the granulation temperature is 100°C to 300°C.

[0038] The electrical insulation properties and other effects of the insulating mica synthetic material of the present invention are illustrated by the following examples.

[0039] Example 12: After the mica is acid-treated, the high-speed mixer is heated to 80°C, 37% mica powder, 0.5% silane coupling agent, and 0.3% styrene-maleic anhydride copolymer are added, and the mica powder surface is treated by high-speed mixing for 10 min. At a temperature of 80°C, 35.0% polycarbonate, 8.4% polyurethane, 1.0% titanate coupling agent, 0.3% aluminate coupling agent, 0.9% acrylic polymer, 3.0% phenolic resin, and 5.8% silicon carbide fiber are added, and the mixture is mixed at high speed for 15 min, and further surface treated, modified, and blended. 1.3% polyethylene wax, 2.0% complex calcium-based grease, and 3.0% ammonium polyphosphate are added and mixed for 15 min. 1.5% benzoyl peroxide is added and the mixture is mixed at high speed for 5 min to blend the materials. The material was taken out, stirred at low temperature for 10 min, and taken out when the material temperature was below 30°C. The material was mixed and plasticized by an internal mixer, drawn by a single screw wire drawing machine, and granulated by a granulator according to the conventional method. Then the volume resistivity, tensile strength, notched impact strength, density, and Rockwell hardness were measured. The results are shown in Table 1.

[0040] Example 13: After the mica is acid-treated, the high-speed mixer is heated to 80°C, 30% mica powder, 0.5% silane coupling agent, and 0.7% styrene-maleic anhydride copolymer are added, and the mica powder surface is treated by high-speed mixing for 10 min. At a temperature of 80°C, 40.0% polycarbonate, 9.0% polyurethane, 1.0% titanate coupling agent, 0.3% aluminate coupling agent, 0.9% acrylic polymer, 3.5% phenolic resin, and 5.8% silicon carbide fiber are added, and the mixture is mixed at high speed for 15 min, and further surface treated, modified, and blended. 1.8% polyethylene wax, 2.0% complex calcium-based grease, and 3.0% ammonium polyphosphate are added and mixed for 15 min. 1.5% benzoyl peroxide is added and the mixture is mixed at high speed for 5 min to blend the materials. The material was taken out, stirred at low temperature for 10 min, and taken out when the material temperature was below 30°C. The material was mixed and plasticized by an internal mixer, drawn by a single screw wire drawing machine, and granulated by a granulator according to the conventional method. Then the volume resistivity, tensile strength, notched impact strength, density, and Rockwell hardness were measured. The results are shown in Table 1.

[0041] Example 14: After the mica is acid-treated, the high-speed mixer is heated to 80°C, 41% mica powder, 0.5% silane coupling agent, and 0.3% styrene-maleic anhydride copolymer are added, and the mica powder surface is treated by high-speed mixing for 10 min. At a temperature of 80°C, 37.0% polycarbonate, 4.4% polyurethane, 1.0% titanate coupling agent, 0.3% aluminate coupling agent, 0.9% acrylic polymer, 2.0% phenolic resin, and 5.8% silicon carbide fiber are added, and the mixture is mixed at high speed for 15 min, and further surface treated, modified, and blended. 1.3% polyethylene wax, 2.0% complex calcium-based grease, and 2.0% ammonium polyphosphate are added and mixed for 15 min. 1.5% benzoyl peroxide is added and the mixture is mixed at high speed for 5 min to blend the materials. The material was taken out, stirred at low temperature for 10 min, and taken out when the material temperature was below 30°C. The material was mixed and plasticized by an internal mixer, drawn by a single screw wire drawing machine, and granulated by a granulator according to the conventional method. Then the volume resistivity, tensile strength, notched impact strength, density, and Rockwell hardness were measured. The results are shown in Table 1.

[0042] Example 15: After the mica is acid-treated, the high-speed mixer is heated to 80°C, 40% mica powder, 0.5% silane coupling agent, and 0.3% styrene-maleic anhydride copolymer are added, and the mica powder surface is treated by high-speed mixing for 10 min. At a temperature of 80°C, 40.0% polycarbonate, 5.4% polyurethane, 1.0% titanate coupling agent, 0.3% aluminate coupling agent, 0.9% acrylic polymer, 3.0% phenolic resin, and 2.8% silicon carbide fiber are added, and the mixture is mixed at high speed for 15 min, and further surface treated, modified, and blended. 1.3% polyethylene wax, 2.0% complex calcium-based grease, and 2.0% ammonium polyphosphate are added and mixed for 15 min. 1.5% benzoyl peroxide is added and the mixture is mixed at high speed for 5 min to blend the materials. The material was taken out, stirred at low temperature for 10 min, and taken out when the material temperature was below 30°C. The material was mixed and plasticized by an internal mixer, drawn by a single screw wire drawing machine, and granulated by a granulator according to the conventional method. Then the volume resistivity, tensile strength, notched impact strength, density, and Rockwell hardness were measured. The results are shown in Table 1.

[0043] Example 16: After the mica is acid-treated, the high-speed mixer is heated to 80°C, 33% mica powder, 0.5% silane coupling agent, and 0.3% styrene-maleic anhydride copolymer are added, and the mica powder surface is treated by high-speed mixing for 10 min. At a temperature of 80°C, 39.0% polycarbonate, 7.4% polyurethane, 2.0% titanate coupling agent, 0.3% aluminate coupling agent, 0.9% acrylic polymer, 5.0% phenolic resin, and 2.8% silicon carbide fiber are added, and the mixture is mixed at high speed for 15 min, and further surface treated, modified, and blended. 1.3% polyethylene wax, 2.0% complex calcium-based grease, and 3.0% ammonium polyphosphate are added and mixed for 15 min. 1.5% benzoyl peroxide is added and the mixture is mixed at high speed for 5 min to blend the materials. The material was taken out, stirred at low temperature for 10 min, and taken out when the material temperature was below 30°C. The material was mixed and plasticized by an internal mixer, drawn by a single screw wire drawing machine, and granulated by a granulator according to the conventional method. Then the volume resistivity, tensile strength, notched impact strength, density, and Rockwell hardness were measured. The results are shown in Table 1.

[0044] Example 17: After the mica is acid-treated, the high-speed mixer is heated to 80°C, and 28% mica powder, 0.5% silane coupling agent, and 0.3% styrene-maleic anhydride copolymer are added, and the mica powder surface is treated by high-speed mixing for 10 min. At a temperature of 80°C, 42.0% polycarbonate, 10.4% polyurethane, 1.0% titanate coupling agent, 0.3% aluminate coupling agent, 0.9% acrylic polymer, 3.0% phenolic resin, and 5.8% silicon carbide fiber are added, and the mixture is mixed at high speed for 15 min, and further surface treated, modified, and blended. 1.3% polyethylene wax, 2.0% complex calcium-based grease, and 3.0% ammonium polyphosphate are added and mixed for 15 min. 1.5% benzoyl peroxide is added and the mixture is mixed at high speed for 5 min to blend the materials. The material was taken out, stirred at low temperature for 10 min, and taken out when the material temperature was below 30°C. The material was mixed and plasticized by an internal mixer, drawn by a single screw wire drawing machine, and granulated by a granulator according to the conventional method. Then the volume resistivity, tensile strength, notched impact strength, density, and Rockwell hardness were measured. The results are shown in Table 1.

[0045] Table 1 Composite material performance test results of Example 12-Example 17 ; In summary, the present invention provides a method for preparing an insulating composite material, wherein the insulating mica composite material obtained by acid treatment, surface modification and blending modification of mica powder has excellent mechanical properties, thermal stability, electrical properties and environmental performance. This material has wide application potential in the fields of electronic components, construction, aviation, etc.

[0046] Compared with traditional metal salt and inorganic material composite materials, the mica-based composite material of the present invention has significant advantages: first, mica has high strength and good thermal stability, and can maintain stable performance in harsh environments; second, the modified mica material has good dispersibility and interface bonding strength, which can effectively enhance the overall performance of the composite material; finally, the present invention does not involve toxic metals or complex chemical additives, meets the requirements of green environmental protection, and has extremely low environmental pollution risks.

[0047] In addition, the present invention not only improves the electrical insulation of the material, but also greatly enhances the mechanical properties of the material by optimizing the mica processing process, providing a new idea for the development of the material. The source of mica powder is abundant and the cost is low, so that the mica-based composite material of the present invention has strong market competitiveness.

[0048] In summary, the insulating mica synthetic material of the present invention successfully solves some problems in the application of mica materials by adopting advanced modification technology, and provides a material solution with excellent performance and environmental protection. Its excellent comprehensive performance and sustainability will promote technological progress in related industries, open up new development paths, and have great application and promotion value.

[0049] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A method for preparing an insulating composite material, characterized in that: The method comprises the following steps: (1) Mica treatment: Treating mica powder with a fineness of 200 to 2000 mesh with acid, wherein the acid used in the acid treatment is one or more of nitric acid, hydrochloric acid or sulfuric acid, the acid concentration is 5% to 30%, the treatment time is 0.5 to 5 hours, and after the treatment, washing with deionized water for 3 to 7 times, each washing time is 10 to 30 minutes, and drying at 60° C. to 120° C. for 3 to 12 hours for use; (2) Initial surface modification of mica: Heat the high-speed mixer to 40 to 120°C, add 8 to 53% by weight of mica powder, 0.5 to 15% by weight of additives, 0.1 to 11% by weight of plasticizers, and 1 to 15% by weight of grease, and mix at high speed for 3 to 60 minutes to perform preliminary dispersion and surface modification treatment; (3) Mica deep surface modification and bonding treatment: Add 15% to 70% of a binder, 0.1% to 8% of an additive, 0.5% to 5% of a reinforcing agent, and 1% to 5% of a crosslinking agent to the modified mica obtained in step (2), raise the temperature to 70° C. to 140° C., and mix at a high speed for 6 minutes to 55 minutes to complete the deep surface modification treatment and bonding; (4) Cooling and granulation: The material obtained in step (3) is taken out and cooled and stirred for 10 to 30 minutes. After the material temperature drops to 30° C., it is granulated by a granulator to obtain insulating mica synthetic material particles.

2. The method for preparing the insulating composite material according to claim 1, characterized in that: The binder includes one or more of polypropylene, nylon, polyoxymethylene, polyvinyl acetate, polyurethane, phenolic resin, polyethylene terephthalate, and polycarbonate.

3. The method for preparing the insulating composite material according to any one of claims 1 to 2, characterized in that: The additives include one or more of coupling agents, compatibilizers, antioxidants, plasticizers, catalysts, crosslinking agents, flame retardants, ultraviolet absorbers, antistatic agents, and light stabilizers.

4. The method for preparing the insulating composite material according to claim 3, characterized in that: The coupling agent includes one or more of a silane coupling agent, a titanate coupling agent, a zirconate coupling agent, an aluminate coupling agent, and a rare earth coupling agent.

5. The method for preparing the insulating composite material according to claim 3, characterized in that: The compatibilizer includes one or more of maleic anhydride grafted polymer, epoxide, acrylic polymer, and styrene-maleic anhydride copolymer.

6. The method for preparing the insulating composite material according to claim 1, characterized in that: The plasticizer includes one or more of polyether, modified rubber, dibutyl phthalate, and dioctyl adipate.

7. The method for preparing the insulating composite material according to claim 3, characterized in that: The lubricating grease includes one or more of polyethylene wax, liquid paraffin, stearate, polytetrafluoroethylene powder, and composite calcium-based lubricating grease; The flame retardant includes one or more of nitrogen flame retardant, phosphorus flame retardant, flame retardant 101, halogen-free flame retardant, magnesium hydroxide, and intumescent flame retardant; Among them, nitrogen-based flame retardants include melamine derivatives; phosphorus-based flame retardants include ammonium polyphosphate and phosphate esters.

8. The method for preparing the insulating composite material according to claim 1, characterized in that: The reinforcing agent is one or more of glass fiber, protein clay, carbon black, montmorillonite, glass microbeads, and silicon carbide fiber; The cross-linking agent is one or more of boron trifluoride, hexamethylenetetramine, benzoyl peroxide, and divinylbenzene; The granulation temperature is 100°C to 300°C.

9. An insulating composite material, characterized in that: The insulating mica synthetic material is prepared according to the preparation method according to any one of claims 1 to 8.

10. An application of an insulating composite material, characterized in that: The insulating mica synthetic material according to claim 9 is used in the preparation of electrical insulation, building fireproof materials, electronic packaging materials or high-performance composite materials.

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