High-flowability insulating silicone rubber as well as preparation method and application thereof

Abstract

The invention provides high-flowability insulating silicone rubber as well as a preparation method and application thereof, and relates to the technical field of rubber composite materials. The high-flowability insulating silicon rubber is prepared from 100 parts of methyl vinyl silicone rubber, 90 to 120 parts of aluminum hydroxide, 25 to 35 parts of organic modified white carbon black, 30 to 40 parts of anisole, 4 to 6 parts of hydroxyl silicone oil, 1.5 to 2.5 parts of vulcanizing agent, 8 to 12 parts of nano filler and 0.5 to 2 parts of lubricating agent, the weight ratio of enol to hexamethylphosphoric triamide to white carbon black is (1.5-2): (4-4.5): 1. According to the invention, the white carbon black is modified by using enol and hexamethylphosphoramide, and the enol and hexamethylphosphoramide act together with anisole, so that the fluidity of the silicone rubber can be further improved on the basis of keeping high insulativity of the silicone rubber.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber composite materials, in particular to a high-flow insulating silicone rubber and a preparation method and application thereof. Background Art

[0002] Insulators are components used in power transmission lines, providing electrical insulation and mechanical connection between high-voltage conductors and towers. Based on the insulating material used, they can be categorized as porcelain, glass, and composite insulators. Porcelain insulators have the disadvantage of a zero-value problem: they appear to be in good condition but are internally conductive and ineffective. Furthermore, zero-value measurement is labor-intensive, resulting in high line operation and maintenance costs. Glass insulators are manufactured from fiberglass reinforced plastics (FRP), resulting in significantly lower line operation and maintenance costs than porcelain insulators. However, their disadvantages are their heavy weight and the tendency for surface contamination to accumulate, leading to higher tower construction costs and the risk of contamination flashover.

[0003] Composite insulators, a new type of insulator developed in recent decades, feature a compact structure, small size, and light weight (1 / 7 to 1 / 10 of a similar-grade porcelain insulator string). They also exhibit excellent elasticity, high wet and pollution flashover voltages, and require no regular cleaning. These advantages greatly facilitate transportation and installation, significantly reduce maintenance costs, and ease worker labor. They also offer excellent conditions for accident repairs and the implementation of compact lines.

[0004] Currently, the outer insulation sheath material of composite insulators for transmission lines is made of high-temperature vulcanized silicone rubber (hereinafter referred to as silicone rubber). Due to its special application area, it must have excellent mechanical properties, outstanding electrical properties, and good resistance to leakage tracking. It is an elastomer vulcanized under high temperature and high pressure using methyl vinyl rubber as the base rubber, white carbon black as the reinforcing filler, a large amount of functional powder as filler, and hydroxyl silicone oil as a structural control agent, combined with a peroxide vulcanizer. However, the addition of a large number of functional fillers places higher demands on the fluidity and processability of silicone rubber, especially when injection molding is used. When silicone rubber has poor fluidity, the rubber compound is relatively hard and easily slags off during re-refining, and the finished product is prone to problems such as rubber deficiency.

[0005] Silica is an essential reinforcing filler for silicone rubber. However, it forms a silica network within the polymer matrix, restricting the system's fluidity and acting as a thickener. As the silica loading increases, the silica network becomes more complete, inevitably decreasing fluidity. While organic modification of silica can significantly improve the fluidity of silicone rubber, its application requires careful consideration of its comprehensive properties, including fluidity, strength, and electrical insulation. While silicone rubber's excellent fluidity facilitates mold filling and mixing with other materials during processing, its molecular chains exhibit greater mobility, making them more prone to random alignment during processing and use. This results in a less dense microstructure and the presence of numerous defects and voids. These defects and voids provide pathways for charge migration, reducing volume resistivity and impairing insulation performance.

[0006] Therefore, it is necessary to provide a silicone rubber having both high insulation and high fluidity. Summary of the Invention

[0007] The present invention aims to address the above-mentioned drawbacks of existing materials by providing a highly fluid insulating silicone rubber. By modifying the reinforcing filler silica in the silicone rubber and combining it with anisole, the present invention can further enhance the fluidity of the silicone rubber while maintaining its high insulating properties.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

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

[0010]

[0011] The organic modifier in the organically modified silica includes enol and hexamethylphosphoric triamide, and the weight ratio is enol: hexamethylphosphoric triamide: 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 propenol, preferably isopentenol.

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

[0014] According to the weight ratio, enol, hexamethylphosphoric triamide, and white carbon black are mixed and dispersed in water, a dispersant is added, and the mixture is evenly mixed to obtain a reaction liquid. The mixture is reacted for 2 to 4 hours under an inert atmosphere at 60 to 70° C. and a pH of 7.5 to 9.5. The organically modified white carbon black is obtained after washing and drying.

[0015] As an embodiment of the present invention, 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%.

[0016] As an embodiment of the present invention, the D of the organically modified silica is 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, it satisfies: D V 50”: D V 50'=(0.03~0.7):1.

[0019] As an embodiment of the present invention, the nano filler 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 a peroxide vulcanizing agent, a platinum vulcanizing agent, a 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] The second aspect of the present invention provides a method for preparing the high-flow insulating silicone rubber of the rubber according to the first aspect of the present invention, comprising the following steps:

[0023] The high-flow insulating silicone rubber is obtained by uniformly mixing methyl vinyl silicone rubber, aluminum hydroxide, organically modified silica, anisole, hydroxy silicone oil, a vulcanizing agent, a nanofiller, and a lubricant according to the weight parts, and then kneading at 100-160° C. under vacuum conditions for 0.5-1 hour.

[0024] The third aspect of the present invention provides a use 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 present invention has the following beneficial effects:

[0026] The present invention uses enol and hexamethylphosphoric triamide to modify white carbon black, and acts together with anisole to further improve the fluidity of silicone rubber while maintaining the high insulation of silicone rubber.

[0027] The viscosity of the silicone rubber prepared by the present invention at 40°C is 10.7×10 3 Pa·s or less, and the volume resistivity is 1.62×10 13 Ω·m and above, indicating that silicone rubber has both good fluidity and insulation resistance. DETAILED DESCRIPTION

[0028] For better explanation of the purpose, technical scheme and advantage of the present invention, the present invention will be further described below in conjunction with specific embodiment, but embodiment does not limit the present invention in any form.Unless otherwise stated, the reagent, method and equipment adopted in the present invention are conventional reagents, methods and equipment in the art.Unless otherwise stated, the reagents and materials used in the present invention are commercially available.

[0029] In the present invention, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0030] In the present invention, when referring to numerical ranges, 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 such minimum and maximum values. Furthermore, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges subsumed therein.

[0031] The reagents and instruments used in the present invention without indicating the manufacturer are all conventional products that can be purchased from the market.

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

[0033]

[0034] The organic modifier in the organically modified silica includes enol and hexamethylphosphoric triamide, and the weight ratio is enol: hexamethylphosphoric triamide: silica = (1.5-2): (4-4.5): 1.

[0035] Silica is a type of amorphous silicon dioxide with a small particle size and a large specific surface area. It has a large number of silanol (Si-OH) groups on its surface. These silanol groups are highly reactive and can form hydrogen bonds with oxygen atoms in the silicone rubber molecular chain, thereby affecting the performance of the silicone rubber. The present invention modifies silica with enol and hexamethylphosphoric triamide, and works with anisole to further improve the fluidity of the silicone rubber while maintaining its high insulation properties. Specifically:

[0036] On the one hand, both enol and hexamethylphosphoramide can react with the hydroxyl groups on the surface of silica, reducing the content of active hydroxyl groups on the silica surface: (a) Enol can react with the silanol groups on the silica surface to form chemical bonds, thereby reducing the number of hydroxyl groups on the silica surface; (b) Hexamethylphosphoramide is a compound containing phosphorus. The phosphorus atoms in its molecules have high electronegativity and can interact with the silanol groups on the silica surface to form coordination bonds or hydrogen bonds. This helps to improve the dispersion of silica in silicone rubber, reduce its tendency to agglomerate, and thus improve the fluidity 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. It can not only interact with the 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 the silicone rubber; it can also interact with hexamethylphosphoric triamide with high electronegativity to improve the spacing between the silicone rubber molecular chains and the polarity of the molecular chains, further optimizing the structure and charge transfer performance of the silicone rubber molecular chains and improving the insulation properties of the silicone rubber.

[0038] Furthermore, while enol can react with the hydroxyl groups on the surface of silica, the silicone rubber of the present invention also contains a large amount of aluminum hydroxide, an amphoteric hydroxide that exhibits acidic or alkaline properties during processing. This converts the enol into a ketone under acidic or alkaline conditions, reducing the dispersibility of silica in the silicone rubber matrix. Furthermore, the charge of hexamethylphosphoric triamide further improves the reactivity of the enol and enhances its chemical stability, facilitating the subsequent vulcanization of the silicone rubber to prepare insulating materials and improving its processing stability.

[0039] In the present invention, the silicone rubber matrix is ​​not limited, and any methyl vinyl silicone rubber commonly used in the art can be used in the present invention.

[0040] In some embodiments of the present invention, the enol comprises at least one of prenol and propenol, with prenol being further preferred. Enols can both chemically react with silica and interact with the silicone rubber matrix, forming good compatibility. In prenol, the methyl group pushes the electron cloud toward the double-bonded carbon atom of the enol through an inductive effect. This electron-pushing effect increases the electron cloud density on the double-bonded carbon atom, thereby affecting the charge distribution throughout the enol molecule. This, in conjunction with hexamethylphosphoric triamide and anisole, further enhances the insulating properties of the silicone rubber.

[0041] In some embodiments of the present invention, the organically modified silica is prepared according to a method comprising the following steps: dispersing enol, hexamethylphosphoric triamide, and silica in water according to the weight ratio, adding a dispersant, and mixing evenly to obtain a reaction solution, reacting for 2 to 4 hours under an inert atmosphere, 60 to 70° C., and a pH of 7.5 to 9.5, and then washing and drying to obtain the organically modified silica.

[0042] In some embodiments of the present invention, the dispersant includes but is not limited to sodium lauryl sulfate. The amount of the dispersant used is 2-5 wt% of the white carbon black.

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

[0044] In some embodiments of the present invention, 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%. When aluminum hydroxide decomposes upon heating to produce water of crystallization, it can more evenly absorb heat from the silicone rubber. When an arc burns the silicone rubber surface, it prevents electrical breakdown due to excessively high temperatures at a specific point in the insulating material, thereby significantly improving the silicone rubber's arc resistance. Aluminum hydroxide within this suitable particle size range is not prone to agglomeration and has a certain degree of surface roughness, which facilitates forming a tight interfacial bond with the silicone rubber matrix. This tight bond helps reduce defects and voids within the material, reducing the mobility of electrons or ions within the silicone rubber, thereby improving the silicone rubber's resistivity and electrical insulation properties.

[0045] In some embodiments of the present invention, the D of the organically modified silica is V 50' is 80~400nm, D V50' represents the particle size corresponding to when the cumulative volume of the organically modified silica reaches 50%. As a reinforcing filler in silicone rubber, silica's dispersion within the matrix significantly impacts the mechanical properties of the silicone rubber. Within the aforementioned suitable particle size range, the modified silica can be evenly dispersed within the silicone rubber matrix, avoiding silica agglomeration that can lead to porosity in the vulcanized silicone rubber elastomer, which in turn can reduce the mechanical strength and electrical insulation properties of the silicone rubber product.

[0046] In some embodiments of the present invention, the D 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 conditions are met: V 50”: D V 50' = (0.03-0.7): 1. Both organically modified silica and nanofillers are functional additives in silicone rubber. When their particle sizes meet the aforementioned ratio, they can further enhance their uniform dispersion within the silicone rubber matrix, further improving the electrical insulation properties of the 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, while nano-cordierite has multiple benefits in silicone rubber, including improving electrical insulation, enhancing mechanical properties, improving thermal and optical properties, and optimizing processing performance.

[0049] In the present invention, hydroxy silicone oil is a common plasticizer in the field of silicone rubber. Its addition can improve the plasticity and fluidity of silicone rubber, and thus can add a higher content of inorganic fillers (such as aluminum hydroxide) to the silicone rubber matrix, thereby improving the insulation performance of silicone rubber. Hydroxy silicone oil can also effectively inhibit the structuring phenomenon of silicone rubber, extend the shelf life of the rubber, and enable it to maintain good processing properties after long-term storage. Any hydroxy silicone oil commonly used in the art can be used in the present invention.

[0050] In the present invention, the type of vulcanizing agent is not particularly limited, and any vulcanizing agent commonly used in the art can be used in the present invention. Exemplarily, the vulcanizing agent includes but is not limited to at least one of a peroxide vulcanizing agent, a platinum vulcanizing agent, a 3M vulcanizing agent, sulfur, and a mercaptan; the peroxide vulcanizing agent includes but is not limited to at least one of a bis(2,5-dimethyl-2,5-di-tert-butylperoxyhexane, DBPMH), a bis(2,4-dichlorobenzoyl peroxide, DCBP), di-tert-butyl peroxide (DTBP), and cumene peroxide (DCP).

[0051] In the present invention, the type of lubricant is not particularly limited, and any vulcanizing agent commonly used in the art can be used in the present invention. Exemplarily, 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] The second aspect of the present invention provides a method for preparing the high-flow insulating silicone rubber of the rubber according to the first aspect of the present invention, comprising the following steps:

[0053] The high-flow insulating silicone rubber is obtained by uniformly mixing methyl vinyl silicone rubber, aluminum hydroxide, organically modified silica, anisole, hydroxy silicone oil, a vulcanizing agent, a nanofiller, and a lubricant according to the weight parts, and then kneading at 100-160° C. under vacuum conditions for 0.5-1 hour.

[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 temperature and pressure to produce various silicone rubber products from a fluid elastomer.

[0055] The third aspect of the present invention provides a use 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 conventional commercial products in the field.

[0058] Methyl vinyl silicone rubber: MVQ110-1, viscosity 4×10 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 at 25±0.1°C, purchased from Jiangsu Zhonghe Silicon-based New Materials Co., Ltd.

[0060] 1# Aluminum hydroxide: Use particle size tester to test D V 50 is 3 μm, commercially available;

[0061] 2# Aluminum hydroxide: Use particle size tester to test D V 50 is 5 μm, commercially available;

[0062] 1# nano filler: ferric oxide (Fe2O3), tested using a particle size tester to obtain D V 50” is 20nm, commercially available;

[0063] 2# nano filler: ferric oxide (Fe2O3), D was obtained by particle size tester. V 50” is 50nm, commercially available;

[0064] 3# nano filler: ferric oxide (Fe2O3), tested using a particle size tester to obtain D V 50” is 100nm, commercially available;

[0065] 4# Nano filler: Nano cordierite, tested using a particle size tester to obtain D V 50” is 50nm, commercially available;

[0066] Curing agent: Dipentadienyl curing agent DBPMH, commercially available;

[0067] Lubricant: zinc stearate, commercially available;

[0068] Fumed silica (WCB): brand GBS-HL-150, particle size 15 nm, 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, 100 g of the pretreated fumed silica was mixed with 500 g of deionized water, and 2.5 g of sodium dodecyl sulfate (SDS) was added. The mixture was stirred at 200 r / min and heated to 65°C. The pH value was adjusted to 8 with ammonia water. The mixture was placed in a sealed container and nitrogen was continuously introduced.

[0074] (3) 170 g of isopentenol and 430 g of hexamethylphosphoramide (HMPA) were prepared into 600 g of a modified solution, which was added to the system of step (2) and stirred at 65 ° C for 2.5 hours, during which the pH was maintained between 7.5 and 9.5. After the reaction was completed, the modified silica was repeatedly washed with ethanol and water and dried to obtain an organic modified silica, which was recorded 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 the reaction raw materials in step (3). The parameters of the organic modified silica are detailed in Table 1.

[0076] Table 1 Organic modified silica

[0077]

[0078]

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

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

[0081] According to the formulas in Tables 2 and 3, methyl vinyl silicone rubber, aluminum hydroxide, organically modified silica, anisole, hydroxy silicone oil, vulcanizing agent, nanofiller, and lubricant are uniformly mixed, and then kneaded uniformly (about 0.5 to 1 h) at 120°C and vacuum conditions (vacuum degree of 100 Pa) 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 examples and comparative examples were analyzed, and the specific test methods and test results are as follows:

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

[0090] (2) The rubber mix was prepared into a disc sample with a diameter of 20 mm and a thickness of 1 mm, and the following volume resistivity test was carried out:

[0091] The sample is placed in a three-electrode volume resistivity test system at a test temperature of 30°C. When the temperature of the test 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 pressure application is used to calculate the volume resistivity. The larger the volume resistivity, the better the insulation performance of the silicone rubber.

[0092] The specific test results are shown in Table 4.

[0093] Table 4

[0094]

[0095]

[0096] From the above results we can see that:

[0097] By modifying silica with enol and hexamethylphosphoric triamide and working together with anisole, the fluidity of silicone rubber can be further improved while maintaining its high insulation properties.

[0098] The viscosity of the silicone rubber prepared by the present invention at 40°C is 10.7×10 3 Pa·s or less, and the volume resistivity is 1.62×10 13 Ω·m and above, indicating that silicone rubber has both good fluidity 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 the technical solutions of the present invention may be modified or replaced by equivalents 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 composition comprises the following components in parts by weight: The organic modifier in the organically modified silica includes enol and hexamethylphosphoric triamide, and the weight ratio is enol: hexamethylphosphoric triamide: silica = (1.5-2): (4-4.5):

1.

2. The high-flow insulating silicone rubber according to claim 1, characterized in that: The enol includes at least one of isopentenol and propenol.

3. The high-flow insulating silicone rubber according to claim 2, characterized in that: The enol includes prenol.

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

5. The organically modified white carbon black is obtained after washing and drying.

5. 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%.

6. The high-flow insulating silicone rubber according to claim 1, characterized in that: Meet at least one of the following characteristics: (1) 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) 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%.

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

1.

8. The high-flow insulating silicone rubber according to claim 1, characterized in that: Meet 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 a peroxide vulcanizing agent, a platinum vulcanizing agent, a 3M vulcanizing agent, sulfur, and a mercaptan; (3) The lubricant includes at least one of zinc stearate, magnesium stearate, calcium stearate, pentaerythritol stearate, and n-butyl stearate.

9. The method for preparing the high-flow insulating silicone rubber according to any one of claims 1 to 8, characterized in that: The steps include: The high-flow insulating silicone rubber is obtained by uniformly mixing methyl vinyl silicone rubber, aluminum hydroxide, organically modified silica, anisole, hydroxy silicone oil, a vulcanizing agent, a nanofiller, and a lubricant according to the weight parts, and then kneading at 100-160° C. under vacuum conditions for 0.5-1 hour.

10. Use of the high-flow insulating silicone rubber according to any one of claims 1 to 8, characterized in that: The high-flow insulating silicone rubber is used for preparing insulating materials.

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