A high-flow insulating silicone rubber, its preparation method and application

Abstract

This invention provides a high-flow insulating silicone rubber, its preparation method, and its applications, relating to the field of rubber composite materials technology. The high-flow insulating silicone rubber of this invention comprises 100 parts methyl vinyl silicone rubber, 90-120 parts aluminum hydroxide, 25-35 parts organically modified silica, 30-40 parts anisole, 4-6 parts hydroxyl silicone oil, 1.5-2.5 parts vulcanizing agent, 8-12 parts nanofiller, and 0.5-2 parts lubricant. The organic modifier in the organically modified silica includes enol and hexamethylphosphoric triamine, with a weight ratio of enol:hexamethylphosphoric triamine:silica = (1.5-2):(4-4.5):1. This invention, by modifying silica with enol and hexamethylphosphoric triamine and acting in conjunction with anisole, can further improve the flowability of silicone rubber while maintaining its high insulation properties.

Description

Technical Field

[0001] This invention relates to the field of rubber composite materials technology, and in particular to a high-flow insulating silicone rubber, its preparation method, and its application. Background Technology

[0002] An insulator is a component used in power transmission lines, serving to provide electrical insulation and mechanical connection between high-voltage conductors and towers. Based on the insulating material used, they can be classified into porcelain insulators, glass insulators, and composite insulators. The disadvantage of porcelain insulators is the problem of zero-value measurement; that is, they may appear to be working well, but internally they may have failed to conduct. Furthermore, zero-value measurement is extremely labor-intensive, leading to higher line maintenance costs. Glass insulators are made of fiberglass, resulting in significantly lower line maintenance costs than porcelain insulators. However, their disadvantages include heavier weight, a tendency for surface contamination, higher tower costs, and the risk of pollution flashover.

[0003] Composite insulators are a new type of insulator material developed in recent decades. They are compact, small in size, and lightweight (1 / 7 to 1 / 10 the weight of a comparable porcelain insulator string). They possess good elasticity, high wet flashover and pollution flashover voltages, and do not require regular cleaning. Therefore, they not only greatly facilitate transportation and installation but also significantly reduce maintenance workload and costs, alleviate the labor intensity of workers, and provide favorable conditions for accident repair and the implementation of compact power lines.

[0004] Currently, the outer insulating sheath material used in composite insulators for power transmission lines is high-temperature vulcanized silicone rubber (hereinafter referred to as silicone rubber). Due to the special application fields, it must possess excellent mechanical properties, superior electrical properties, and good resistance to tracking. It is an elastomer formed by vulcanizing methyl vinyl raw rubber as a base rubber, silica as a reinforcing filler, a large number of functional powders as fillers, hydroxyl silicone oil as a structure control agent, and peroxide vulcanizing agents under high temperature and pressure. However, the addition of a large number of functional fillers places higher demands on the fluidity and processability of silicone rubber, especially when using injection molding, where the requirements for fluidity and processability are even more stringent. When silicone rubber has poor fluidity and the compound is hard, it is prone to flaking during remelting, and the finished product is prone to problems such as insufficient rubber.

[0005] Silica is an indispensable reinforcing filler for silicone rubber. However, it forms a silica network structure in the polymer matrix, restricting the system's fluidity and acting as a thickener. As the amount of silica increases, the silica network structure becomes more complete, inevitably reducing fluidity. Although organic modification of silica can significantly improve the fluidity of silicone rubber, its application requires consideration of its comprehensive properties, including fluidity, strength, and electrical insulation. While good fluidity helps silicone rubber better fill molds and mix with other materials during processing, its high fluidity also means stronger molecular chain mobility. During processing or use, the molecular chains are more prone to random arrangement, resulting in a less dense microstructure with more defects and voids. These defects and voids provide channels for charge migration, reducing volume resistivity and deteriorating insulation performance.

[0006] Therefore, there is a need to provide a silicone rubber that simultaneously possesses high insulation and high flowability. Summary of the Invention

[0007] The purpose of this invention is to address the aforementioned deficiencies of existing silicone rubbers by providing a high-flow insulating silicone rubber. This invention achieves this by specifically modifying the reinforcing filler silica in the silicone rubber and combining it with anisole, thereby further improving the flowability of the silicone rubber while maintaining its high insulation properties.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a high-flow insulating silicone rubber comprising the following components in parts by weight:

[0010]

[0011] The organic modifiers in the organically modified silica include enol and hexamethylphosphoric triamine, with a weight ratio of enol:hexamethylphosphoric triamine:silica = (1.5~2):(4~4.5):1.

[0012] As an embodiment of the present invention, the enol includes at least one of isopentenol and allyl alcohol, preferably isopentenol.

[0013] As an embodiment of the present invention, the organic modified silica is prepared by a method comprising the following steps:

[0014] According to the weight ratio, enol, hexamethylphosphoric triamine, and silica are mixed and dispersed in water, a dispersant is added, and the mixture is mixed evenly to obtain a reaction solution. The reaction is carried out for 2 to 4 hours under an inert atmosphere, at 60 to 70°C and a pH of 7.5 to 9.5. After washing and drying, the organic modified silica is obtained.

[0015] As an embodiment of the present invention, the aluminum hydroxide D V 50 is 1-5 μm, D V 50 represents the particle size corresponding to when the cumulative volume of the aluminum hydroxide powder particles reaches 50%.

[0016] As an embodiment of the present invention, the D of the organic modified silica... V 50' is 80-400nm, D V 50' represents the particle size corresponding to when the cumulative volume of the organic modified silica reaches 50%.

[0017] As an embodiment of the present invention, the D of the nanofiller V 50” is 20-100nm, D V "50" indicates the particle size corresponding to when the cumulative volume of the nanofiller reaches 50%.

[0018] As an embodiment of the present invention, the following condition is satisfied: D V 50”:D V 50' = (0.03 ~ 0.7): 1.

[0019] As an embodiment of the present invention, the nanofiller includes at least one of nano-ferric oxide and nano-cordierite.

[0020] As an embodiment of the present invention, the vulcanizing agent includes at least one of peroxide vulcanizing agent, platinum vulcanizing agent, 3M vulcanizing agent, sulfur, and mercaptan.

[0021] As an embodiment of the present invention, the lubricant includes at least one of zinc stearate, magnesium stearate, calcium stearate, pentaerythritol stearate, and n-butyl stearate.

[0022] A second aspect of the present invention provides a method for preparing the high-flow insulating silicone rubber described in the first aspect of the present invention, comprising the following steps:

[0023] According to the stated weight proportions, methyl vinyl silicone rubber, aluminum hydroxide, organic modified silica, anisole, hydroxyl silicone oil, vulcanizing agent, nanofiller, and lubricant are mixed evenly and then kneaded at 100-160°C under vacuum for 0.5-1 hours to obtain the high-flow insulating silicone rubber.

[0024] A third aspect of the present invention provides the application of the high-flow insulating silicone rubber described in the first aspect of the present invention, wherein the high-flow insulating silicone rubber is used to prepare insulating materials.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] This invention modifies silica with enol and hexamethylphosphoric triamine, and works in conjunction with anisole to further improve the flowability of silicone rubber while maintaining its high insulation properties.

[0027] The silicone rubber prepared by this invention has a viscosity of 10.7 × 10⁻⁶ at 40°C. 3 Below Pa·s, the volume resistivity is all above 1.62 × 10⁻⁶. 13 A value above Ω·m indicates that silicone rubber possesses both good flowability and insulation resistance. Detailed Implementation

[0028] To better illustrate the purpose, technical solution, and advantages of this invention, specific embodiments will be used to further describe the invention below. However, these embodiments do not limit the invention in any way. Unless otherwise specified, the reagents, methods, and equipment used in this invention are conventional reagents, methods, and equipment in this technical field. Unless otherwise specified, all reagents and materials used in this invention are commercially available.

[0029] In this invention, the technical features described in an open-ended manner include both closed-ended technical solutions composed of the listed features and open-ended technical solutions that include the listed features.

[0030] In this invention, numerical ranges are involved. Unless otherwise specified, the numerical ranges are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe features or characteristics, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are included.

[0031] Unless otherwise specified, all reagents or instruments used in this invention are commercially available products.

[0032] This invention provides a high-flow insulating silicone rubber, comprising the following components in parts by weight:

[0033]

[0034] The organic modifiers in the organically modified silica include enol and hexamethylphosphoric triamine, with a weight ratio of enol:hexamethylphosphoric triamine:silica = (1.5~2):(4~4.5):1.

[0035] Silica is an amorphous silica with small particle size and large specific surface area. Its surface contains a large number of silanol groups (Si—OH). These silanol groups are highly reactive and can form hydrogen bonds with oxygen atoms in the silicone rubber molecular chain, thus affecting the properties of silicone rubber. This invention modifies silica with enol and hexamethylphosphoric triamine, and works in conjunction with anisole to further improve the flowability of silicone rubber while maintaining its high insulation properties. Specifically:

[0036] On the one hand, both enols and hexamethylphosphoric triamine can react with the hydroxyl groups on the surface of silica, reducing the content of active hydroxyl groups on the silica surface: (a) enols can react with the silanols on the silica surface to form chemical bonds, thereby reducing the number of hydroxyl groups on the silica surface; (b) hexamethylphosphoric triamine is a compound containing phosphorus, and the phosphorus atoms in its molecule have high electronegativity, which can interact with the silanols on the silica surface to form coordination bonds or hydrogen bonds. This helps to improve the dispersibility of silica in silicone rubber, reduce its agglomeration tendency, and thus improve the flowability of silicone rubber.

[0037] On the other hand, anisole is an organic compound containing ether bonds. The ether bonds in its molecules have a high electron cloud density, which can not only interact with silicon atoms in the silicone rubber molecular chain to form hydrogen bonds or van der Waals forces, thereby improving the insulation resistance and breakdown voltage of silicone rubber; it can also interact with hexamethylphosphoric triamine, which has a high electronegativity, to improve the spacing between silicone rubber molecular chains and the polarity of the molecular chains, further optimizing the structure and charge transfer properties of silicone rubber molecular chains and improving the insulation properties of silicone rubber.

[0038] Furthermore, although enols can react with the hydroxyl groups on the surface of silica, the silicone rubber of this invention also contains a large amount of aluminum hydroxide, which is an amphoteric hydroxide. During processing, it will exhibit acidic or alkaline properties, causing the enols to convert into ketones under acidic or alkaline conditions. This reduces the dispersibility of silica in the silicone rubber matrix. Under the charge effect of hexamethylphosphoric triamine, the reactivity of the enols can be further improved, enhancing their chemical stability and facilitating the subsequent vulcanization processing of the silicone rubber to prepare insulating materials. This improves its processing stability.

[0039] In this invention, no limitation is made to the silicone rubber matrix; any methyl vinyl silicone rubber commonly used in the art can be used in this invention.

[0040] In some embodiments of the present invention, the enol includes at least one of isopentenol and allyl alcohol, with isopentenol being more preferably used. Enols can react chemically with silica and also interact with the silicone rubber matrix, forming good compatibility. In isopentenol, the methyl group pushes the electron cloud towards the double-bonded carbon atom of the enol through an inductive effect. This electron-donating effect increases the electron cloud density on the double-bonded carbon, thereby affecting the charge distribution in the entire enol molecule. Combined with hexamethylphosphoric triamine and anisole, this further enhances the insulating properties of the silicone rubber.

[0041] In some embodiments of the present invention, the organic modified silica is prepared by a method comprising the following steps: according to the weight ratio, enol, hexamethylphosphoric triamine and silica are mixed and dispersed in water, a dispersant is added, and the mixture is mixed evenly to obtain a reaction solution. The reaction solution is then reacted for 2 to 4 hours under an inert atmosphere, at 60 to 70°C and a pH of 7.5 to 9.5. After washing and drying, the organic modified silica is obtained.

[0042] In some embodiments of the present invention, the dispersant includes, but is not limited to, sodium dodecyl sulfonate. The amount of the dispersant used is 2-5 wt% of silica.

[0043] In some embodiments of the present invention, the concentration of silica in the reaction solution is 8-9 wt%.

[0044] In some embodiments of the present invention, the aluminum hydroxide D V 50 is 1-5 μm, D V 50 indicates the particle size corresponding to when the cumulative volume of the aluminum hydroxide powder particles reaches 50%. When aluminum hydroxide decomposes upon heating to produce water of crystallization, it can more uniformly absorb heat from the silicone rubber. When an electric arc burns the surface of the silicone rubber, it will not cause electrical breakdown due to localized excessive temperature at a certain point in the insulating material, thus significantly improving the arc resistance of the silicone rubber. Furthermore, aluminum hydroxide within the aforementioned suitable particle size range is less prone to agglomeration and has a certain degree of surface roughness, which helps to form a tight interfacial bond with the silicone rubber matrix. This tight bond helps to reduce defects and voids within the material, reduce the mobility of electrons or ions within the silicone rubber, and thus improve the resistivity and electrical insulation properties of the silicone rubber.

[0045] In some embodiments of the present invention, the D of the organically modified silica V 50' is 80-400nm, D V50' indicates the particle size corresponding to when the cumulative volume of the organically modified silica reaches 50%. As a reinforcing filler for silicone rubber, the dispersion of silica in the matrix significantly affects the mechanical properties of silicone rubber. The modified silica, within the aforementioned suitable particle size range, can be uniformly dispersed in the silicone rubber matrix, avoiding the formation of pores in the vulcanized silicone rubber elastomer due to silica agglomeration, which in turn leads to a decrease in the mechanical strength and electrical insulation properties of the silicone rubber product.

[0046] In some embodiments of the present invention, the D of the nanofiller V 50” is 20-100nm, D V "50" indicates the particle size corresponding to when the cumulative volume of the nanofiller reaches 50%.

[0047] In some embodiments of the present invention, the following condition is satisfied: D V 50”:D V 50' = (0.03~0.7):1. Both organic modified silica and nanofillers are functional additives in silicone rubber. When their particle sizes meet the above ratio, their dispersion uniformity in the silicone rubber matrix can be further enhanced, thereby further improving the electrical insulation properties of silicone rubber.

[0048] In some embodiments of the present invention, the nanofiller includes at least one of nano-ferric oxide and nano-cordierite. Nano-ferric oxide can improve the heat resistance of silicone rubber; nano-cordierite has multiple functions in silicone rubber, including improving electrical insulation properties, enhancing mechanical properties, improving thermal properties, improving optical properties, and optimizing processing properties.

[0049] In this invention, hydroxyl silicone oil is a common plasticizer in the silicone rubber industry. Its addition can improve the plasticity and flowability of silicone rubber, thereby allowing for the addition of higher content of inorganic fillers (such as aluminum hydroxide) to the silicone rubber matrix, thus improving the insulation properties of silicone rubber. Hydroxyl silicone oil can also effectively inhibit the structuring phenomenon of silicone rubber, extend the shelf life of the compound, and maintain good processing performance even after long-term storage. Commonly used hydroxyl silicone oils in this art can be used in this invention.

[0050] In this invention, no particular limitation is made on the type of vulcanizing agent; commonly used vulcanizing agents in the art can be used in this invention. For example, the vulcanizing agent includes, but is not limited to, at least one of peroxide vulcanizing agents, platinum vulcanizing agents, 3M vulcanizing agents, sulfur, and mercaptans; the peroxide vulcanizing agent includes, but is not limited to, at least one of bis(2,5-dimethyl-2,5-di-tert-butylperoxyhexane, DBPMH), bis(2,4-dichlorobenzoyl peroxide, DCBP), di-tert-butyl peroxide (DTBP), and isopropylbenzene peroxide (DCP).

[0051] In this invention, the type of lubricant is not particularly limited, and commonly used vulcanizing agents in the art can be used in this invention. For example, the lubricant includes, but is not limited to, at least one of zinc stearate, magnesium stearate, calcium stearate, pentaerythritol stearate, and n-butyl stearate.

[0052] A second aspect of the present invention provides a method for preparing the high-flow insulating silicone rubber described in the first aspect of the present invention, comprising the following steps:

[0053] According to the stated weight proportions, methyl vinyl silicone rubber, aluminum hydroxide, organic modified silica, anisole, hydroxyl silicone oil, vulcanizing agent, nanofiller, and lubricant are mixed evenly and then kneaded at 100-160°C under vacuum for 0.5-1 hours to obtain the high-flow insulating silicone rubber.

[0054] It should be noted that the raw silicone rubber obtained by mixing within the above temperature range is only partially cross-linked and needs to be further vulcanized at higher temperatures and pressures from a fluid elastomer to prepare various silicone rubber products.

[0055] A third aspect of the present invention provides the application of the high-flow insulating silicone rubber described in the first aspect of the present invention, wherein the high-flow insulating silicone rubber is used to prepare insulating materials.

[0056] The following are specific embodiments of the present invention.

[0057] The sources of some raw materials used in the embodiments of the present invention are listed below. Raw materials not listed are all commercially available products in the art.

[0058] Methyl vinyl silicone rubber: MVQ110-1, viscosity measured at 25±0.1℃ is 4×10⁻⁶. 3 Pa·s, purchased from Chongqing Nan'an Chemical Co., Ltd.;

[0059] Hydroxyl silicone oil: JZH-203, with a viscosity of 0.03 Pa·s obtained at 25±0.1℃, purchased from Jiangsu Zhonghe Silicon-based New Materials Co., Ltd.;

[0060] #1 Aluminum hydroxide: D obtained by particle size analysis. V 50 is 3μm, commercially available;

[0061] #2 Aluminum hydroxide: D obtained by particle size analysis using a particle size analyzer V 50 is 5μm, commercially available;

[0062] #1 Nanofiller: Ferric oxide (Fe2O3), with a particle size distribution measured using a particle size analyzer. V 50” is 20nm, commercially available;

[0063] #2 Nanofiller: Ferric oxide (Fe2O3), with a particle size distribution measured using a particle size analyzer. V 50” refers to 50nm, commercially available;

[0064] #3 Nanofiller: Ferric oxide (Fe2O3), with a particle size distribution measured using a particle size analyzer. V 50” represents 100nm, commercially available;

[0065] #4 Nanofiller: Nano cordierite, with a particle size distribution measured using a particle size analyzer. V 50” refers to 50nm, commercially available;

[0066] Vulcanizing agent: DBPMH (diphenyl sulfide), commercially available;

[0067] Lubricant: Zinc stearate, commercially available;

[0068] Fumed silica (WCB): grade GBS-HL-150, particle size 15nm, purchased from Guangzhou Jibisheng Technology Industry Co., Ltd.

[0069] N,N-Dimethylformamide (DMF): Commercially available;

[0070] Dimethyl sulfoxide (DMSO): Commercially available;

[0071] Organic-modified white carbon black (ORGWCB) is prepared by the following steps:

[0072] (1) Fumed silica was pretreated at 120°C for 45 minutes;

[0073] (2) Then mix 100g of pretreated fumed silica with 500g of deionized water, add 2.5g of sodium dodecyl sulfonate (SDS), stir at 200r / min and heat to 65℃, adjust the pH to 8 with ammonia, place in a sealed container and continuously purge with nitrogen.

[0074] (3) Prepare a 600g modified solution by mixing 170g isopentenol and 430g hexamethylphosphoramide (HMPA) and add it to the system in step (2). Stir the reaction at 65°C for 2.5 hours, maintaining the pH between 7.5 and 9.5. After the reaction is complete, wash the solution repeatedly with ethanol and water, and dry it to obtain the organic modified silica, denoted as ORGWCB-1.

[0075] Referring to the preparation method of ORGWCB-1, a series of organic modified silica can be prepared by changing the type and amount of reaction raw materials in step (3). The parameters of organic modified silica are detailed in Table 1.

[0076] Table 1 Organic Modified Silica

[0077]

[0078]

[0079] Examples 1-12, Comparative Examples 1-7

[0080] A series of high-flow insulating silicone rubbers are provided, which are prepared by a method comprising the following steps:

[0081] According to the formulations in Tables 2 and 3, methyl vinyl silicone rubber, aluminum hydroxide, organic modified silica, anisole, hydroxyl silicone oil, vulcanizing agent, nanofiller, and lubricant are mixed evenly and then kneaded evenly at 120°C under vacuum conditions (vacuum degree of 100Pa) for about 0.5 to 1 hour to obtain high-flow insulating silicone rubber.

[0082] Table 2

[0083]

[0084] Table 3

[0085]

[0086]

[0087] Performance Analysis

[0088] The properties of the silicone rubber obtained in the above embodiments and comparative examples were analyzed. The specific test methods and test results are as follows:

[0089] (1) Flowability: The viscosity of the silicone rubber compound prepared in the above examples and comparative examples was tested using a rubber processing analyzer. The dynamic time scanning mode was used, the test temperature was 40℃, the test frequency was 1Hz, the torsion angle was 0.5°, and the test time was 25min. The average value of the complex viscosity over 20 to 25 minutes was taken as the viscosity of the silicone rubber compound. The lower the viscosity, the better the flowability.

[0090] (2) Prepare circular samples with a diameter of 20 mm and a thickness of 1 mm from the compounded rubber, and conduct the following volume resistivity test:

[0091] The sample is placed in a three-electrode volume resistivity testing system at a test temperature of 30°C. When the temperature of the testing system rises to the set test temperature, the temperature is maintained for 10 minutes to allow the sample to be heated evenly. Then, a 1kV DC voltage is applied, and the current value after 20 minutes of voltage application is used to calculate the volume resistivity. The higher the volume resistivity, the better the insulation performance of the silicone rubber.

[0092] For detailed test results, please refer to Table 4.

[0093] Table 4

[0094]

[0095]

[0096] The results above show that:

[0097] Modifying silica with enols and hexamethylphosphoric triamine, and then combining it with anisole, can further improve the flowability of silicone rubber while maintaining its high insulation properties.

[0098] The silicone rubber prepared by this invention has a viscosity of 10.7 × 10⁻⁶ at 40°C. 3 Below Pa·s, the volume resistivity is all above 1.62 × 10⁻⁶. 13 A value above Ω·m indicates that silicone rubber possesses both good flowability and insulation resistance.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A high-flow insulating silicone rubber, characterized in that, The components include the following parts by weight: 100 parts of methyl vinyl silicone rubber; 90-120 parts of aluminum hydroxide; 25-35 parts of organically modified silica; 30-40 parts of anisole; 4-6 parts of hydroxyl silicone oil; 1.5 to 2.5 parts of vulcanizing agent; 8-12 parts of nanofiller; Lubricant 0.5~2 parts; The organic modifiers in the organically modified silica include enol and hexamethylphosphoric triamine, with a weight ratio of enol:hexamethylphosphoric triamine:silica = (1.5~2):(4~4.5):1; The enols include at least one of isopentenol and propenol.

2. The high-flow insulating silicone rubber according to claim 1, characterized in that, The enols include isopentenol.

3. The high-flow insulating silicone rubber according to claim 1, characterized in that, The organic-modified silica was prepared by a method comprising the following steps: According to the weight ratio, enol, hexamethylphosphoric triamine, and silica are mixed and dispersed in water, a dispersant is added, and the mixture is mixed evenly to obtain a reaction solution. The reaction is carried out for 2 to 4 hours under an inert atmosphere, at 60 to 70°C and a pH of 7.5 to 9.

5. After washing and drying, the organic modified silica is obtained.

4. The high-flow insulating silicone rubber according to claim 1, characterized in that, The aluminum hydroxide D V 50 is 1~5μm, D V 50 represents the particle size corresponding to when the cumulative volume of the aluminum hydroxide powder particles reaches 50%.

5. The high-flow insulating silicone rubber according to claim 1, characterized in that, It satisfies at least one of the following characteristics: (1) The D of the organic modified silica V 50' is 80~400nm, D V 50' represents the particle size corresponding to when the cumulative volume of the organic modified silica reaches 50%; (2) The D of the nanofiller V 50'' represents 20~100nm, D V 50'' indicates the particle size corresponding to when the cumulative volume of the nanofiller reaches 50%.

6. The high-flow insulating silicone rubber according to claim 5, characterized in that, Satisfy: D V 50'':D V 50' = (0.03~0.7):

1.

7. The high-flow insulating silicone rubber according to claim 1, characterized in that, It satisfies at least one of the following characteristics: (1) The nanofiller includes at least one of nano-ferric oxide and nano-cordierite; (2) The vulcanizing agent includes at least one of peroxide vulcanizing agent, platinum vulcanizing agent, 3M vulcanizing agent, sulfur, and mercaptan; (3) The lubricant includes at least one of zinc stearate, magnesium stearate, calcium stearate, pentaerythritol stearate, and n-butyl stearate.

8. A method for preparing the high-flow insulating silicone rubber according to any one of claims 1 to 7, characterized in that, Includes the following steps: According to the stated weight proportions, methyl vinyl silicone rubber, aluminum hydroxide, organic modified silica, anisole, hydroxyl silicone oil, vulcanizing agent, nanofiller, and lubricant are mixed evenly and then kneaded at 100~160℃ under vacuum for 0.5~1h to obtain the high-flow insulating silicone rubber.

9. The application of the high-flow insulating silicone rubber according to any one of claims 1 to 7, characterized in that, The high-flow insulating silicone rubber is used to prepare insulating materials.

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