Thermal insulation silicone glass fiber sleeve and preparation method thereof

Abstract

The present application relates to fluorosilicon material technical field, especially to a kind of heat insulation silicone glass fiber sleeve and preparation method thereof.The above-mentioned heat insulation silicone glass fiber sleeve, comprising:glass fiber sleeve and fluorosilicon composite coating coated on the outside of glass fiber sleeve;Fluorosilicon composite coating is obtained by heat treatment from fluorosilicon composite emulsion;The raw material of fluorosilicon composite emulsion includes by mass fraction:fluorosilicone rubber emulsion 150-200 parts, silica aerogel 10-20 parts, 3,3,3-trifluoropropyl methyl dimethoxysilane 1-2 parts, boron nitride nanowire 1-3 parts, alumina aerogel 1-5 parts, mica powder 5-15 parts, octa (trimethylsiloxy) cubic siloxane 10-30 parts, cerium oxide nanoparticles 0.5-1 part.The present application inhibits high temperature creep while maintaining softness, and has excellent mechanical properties under the premise of ensuring low density of product.

Description

Technical Field

[0001] This invention relates to the field of fluorosilicone materials technology, and in particular to a heat-insulating silicone resin glass fiber sleeve and its preparation method. Background Technology

[0002] Fiberglass tubing, as an electrical insulating material, is widely used in household appliances, electric heating equipment, and circuit boards due to its excellent electrical insulation, corrosion resistance, aging resistance, and heat dissipation performance, as well as its ability to remain flexible and resistant to bending even at low temperatures. However, the problem of fiberglass loosening in traditional manufacturing processes leads to insufficient high-temperature and voltage resistance in the finished tubing, posing safety hazards.

[0003] Existing bushings have poor overall high-temperature insulation performance, which leads to safety hazards inside the circuit during use and may also pose certain risks to electronic components in normal operation. Resin-based composite materials are widely used due to their advantages such as low density and corrosion resistance. Resin-based composite materials with high-efficiency heat insulation have been widely developed and successfully applied.

[0004] Fluorosilicone resin fiberglass tubing is made by weaving alkali-free glass fibers into a tubular shape, impregnating it with silicone resin, and then heating and curing it. It has strong dielectric properties, good self-extinguishing properties, and flexibility, and is widely used for insulation protection of household appliances, lighting fixtures, electric heating products, electrical equipment, and heat-resistant electrical appliances.

[0005] Traditional fluorosilicone resin fiberglass sleeves use a single fluorosilicone rubber matrix, which has a dense molecular chain structure and generally high material density. This high density leads to an increased thermal conductivity, making it prone to heat accumulation under sustained high-temperature conditions, potentially causing thermal damage to electrical components. Furthermore, high-density materials are more susceptible to partial discharge under an electric field, and existing materials lack effective charge dissipation pathways, further exacerbating the degradation of insulation performance. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a heat-insulating silicone resin glass fiber sleeve and its preparation method.

[0007] A heat-insulating silicone resin glass fiber sleeve includes: a glass fiber sleeve and a fluorosilicone composite coating covering the outside of the glass fiber sleeve; the fluorosilicone composite coating is obtained by heat treatment of a fluorosilicone composite emulsion; the raw materials of the fluorosilicone composite emulsion include, by mass, 150-200 parts of fluorosilicone rubber emulsion, 10-20 parts of silica aerogel, 1-2 parts of 3,3,3-trifluoropropylmethyldimethoxysilane, 1-3 parts of boron nitride nanowires, 1-5 parts of alumina aerogel, 5-15 parts of mica powder, 10-30 parts of octa(trimethylsiloxy)cubic siloxane, and 0.5-1 parts of cerium oxide nanoparticles.

[0008] Preferably, the solid content of the fluorosilicone rubber emulsion is 30-50%.

[0009] Preferably, the silica aerogel has a particle size of 50-100 nm and a specific surface area of ​​600-700 m². 2 / g.

[0010] Preferably, the aspect ratio of the boron nitride nanowires is 50-100:1.

[0011] Preferably, the alumina aerogel has a pore size of 1-5 nm and a specific surface area of ​​300-400 m². 2 / g.

[0012] Preferably, the mica powder has a particle size of 10-50 μm.

[0013] Preferably, the cerium oxide nanoparticles have a particle size of 10-50 nm.

[0014] The preparation method of the above-mentioned heat-insulating silicone resin glass fiber sleeve includes the following steps:

[0015] S1. Mix 3,3,3-trifluoropropylmethyldimethoxysilane, boron nitride nanowires, and silica aerogel, and stir at 100-110℃ for 1-2 hours; then add to the fluorosilicone rubber emulsion and ultrasonically disperse for 30-60 minutes to obtain the reinforced fluorosilicone emulsion.

[0016] S2. Add cerium oxide nanoparticles, mica powder, octa(trimethylsiloxy) cubic siloxane, and alumina aerogel to the reinforced fluorosilicone emulsion and mix evenly to obtain a composite emulsion; coat the composite emulsion onto a glass fiber sleeve, heat treat at 50-60℃ for 10-20 min, dry at 120-140℃ for 5-15 min, and heat treat at 160-180℃ for 5-15 min.

[0017] Preferably, in S1, the ultrasonic frequency is 70-90kHz.

[0018] Preferably, in S2, the composite emulsion coating thickness is 50-100 μm.

[0019] Beneficial effects:

[0020] This invention uses 3,3,3-trifluoropropylmethyldimethoxysilane to graft silica aerogel. After grafting, the silica structure is similar to the molecular chain structure of fluorosilicone, which can not only significantly improve the compatibility of silica aerogel with fluorosilicone rubber particles and provide good dispersion performance in emulsion, but also form a three-dimensional porous framework with alumina aerogel. This can effectively restrict the movement of air molecules and provide excellent thermal insulation performance. In addition, it can complement the rigid structure of octa(trimethylsiloxy)cubic siloxane to improve the stability of the aerogel network under the premise of low density and provide excellent mechanical properties.

[0021] This invention involves doping and combining boron nitride nanowires and cerium oxide nanoparticles into fluorosilicone rubber particles. This reduces interfacial thermal resistance within the fluorosilicone polymer matrix, while the cerium oxide nanoparticles undergo Ce2 oxidation at high temperatures. 3+ / Ce 4+ The valence state can be reversibly converted, which can repair microscopic defects caused by partial discharge and maintain dielectric integrity.

[0022] In this invention, the fluorosilicone molecular chain forms a chemical bond with the aerogel through 3,3,3-trifluoropropylmethyldimethoxysilane. Combined with the rigid nodes of cubic siloxane and the flexible segments of the fluorosilicone molecular chain, it maintains flexibility while inhibiting high-temperature creep and ensures excellent mechanical properties while maintaining low product density. Attached Figure Description

[0023] Figure 1 The tensile strength comparison diagram shows the samples prepared using the composite emulsions obtained in Example 5 and Comparative Examples 1-2.

[0024] Figure 2 This is a comparison chart showing the time required to heat the glass fiber sleeves obtained in Example 5 and Comparative Examples 1-2 to 150°C.

[0025] Figure 3 This is a comparison diagram of the breakdown voltage of the glass fiber sleevings obtained in Example 5 and Comparative Examples 1-2. Detailed Implementation

[0026] The present invention will be further explained below with reference to specific embodiments.

[0027] The fluorosilicone rubber emulsion used below was purchased from Beijing Bohengtong Technology Co., Ltd., with a solid content of 47±1% and a viscosity of 1000±200 cps. The silica aerogel used below was purchased from Miao Environmental Protection Technology (Tianjin) Co., Ltd., with a particle size of 75±10 nm and a specific surface area of ​​650±25 m². 2 / g. The alumina aerogel used below was purchased from Xi'an Mouyue Biotechnology Co., Ltd., with a pore size of 1-5nm and a specific surface area of ​​320±10m². 2 / g. The boron nitride nanowires used below were purchased from Keleming (Beijing) Technology Co., Ltd., with an aspect ratio of 50-100:1. The mica powder used below was purchased from Baohaotong Stone Processing Plant in Hongqiao District, Tianjin, with a particle size of 30±10μm. The cerium oxide nanoparticles used below were purchased from Yanligao Biomedical Co., Ltd. in Hubei, with a particle size of 30±10nm. Example 1

[0028] A heat-insulating silicone resin glass fiber sleeve includes: a glass fiber sleeve and a fluorosilicone composite coating covering the outside of the glass fiber sleeve; the fluorosilicone composite coating is obtained by heat treatment of a fluorosilicone composite emulsion.

[0029] The raw materials for the fluorosilicone composite emulsion include: 150g of fluorosilicone rubber emulsion, 10g of silica aerogel, 1g of 3,3,3-trifluoropropylmethyldimethoxysilane, 1g of boron nitride nanowires, 1g of alumina aerogel, 5g of mica powder, 10g of octa(trimethylsiloxy)cubic siloxane, and 0.5g of cerium oxide nanoparticles.

[0030] The preparation method of the above-mentioned heat-insulating silicone resin glass fiber sleeve includes the following steps:

[0031] S1. Mix 3,3,3-trifluoropropylmethyldimethoxysilane, boron nitride nanowires and silica aerogel, and stir at 100℃ for 1 hour at a stirring speed of 100 r / min; then add to fluorosilicone rubber emulsion and ultrasonically disperse for 30 minutes at an ultrasonic frequency of 70 kHz to obtain reinforced fluorosilicone emulsion.

[0032] S2. Add cerium oxide nanoparticles, mica powder, octa(trimethylsiloxy) cubic siloxane, and alumina aerogel to the reinforced fluorosilicone emulsion and mix evenly to obtain a composite emulsion.

[0033] The composite emulsion was coated onto the glass fiber sleeve with a coating thickness of 50 μm; it was then heat-treated at 50 °C for 10 min, dried at 100 °C for 5 min, and heat-treated at 140 °C for 5 min. Example 2

[0034] A heat-insulating silicone resin glass fiber sleeve includes: a glass fiber sleeve and a fluorosilicone composite coating covering the outside of the glass fiber sleeve; the fluorosilicone composite coating is obtained by heat treatment of a fluorosilicone composite emulsion.

[0035] The raw materials for the fluorosilicone composite emulsion include: 200g of fluorosilicone rubber emulsion, 20g of silica aerogel, 2g of 3,3,3-trifluoropropylmethyldimethoxysilane, 3g of boron nitride nanowires, 5g of alumina aerogel, 15g of mica powder, 30g of octa(trimethylsiloxy)cubic siloxane, and 1g of cerium oxide nanoparticles.

[0036] The preparation method of the above-mentioned heat-insulating silicone resin glass fiber sleeve includes the following steps:

[0037] S1. Mix 3,3,3-trifluoropropylmethyldimethoxysilane, boron nitride nanowires and silica aerogel, and stir at 110℃ for 2 hours at a stirring speed of 200 r / min; then add to fluorosilicone rubber emulsion and ultrasonically disperse for 60 minutes at an ultrasonic frequency of 90 kHz to obtain reinforced fluorosilicone emulsion.

[0038] S2. Add cerium oxide nanoparticles, mica powder, octa(trimethylsiloxy) cubic siloxane, and alumina aerogel to the reinforced fluorosilicone emulsion and mix evenly to obtain a composite emulsion.

[0039] The composite emulsion was coated onto the glass fiber sleeve with a coating thickness of 100 μm; it was then heat-treated at 60 °C for 20 min, dried at 110 °C for 15 min, and heat-treated at 150 °C for 15 min. Example 3

[0040] A heat-insulating silicone resin glass fiber sleeve includes: a glass fiber sleeve and a fluorosilicone composite coating covering the outside of the glass fiber sleeve; the fluorosilicone composite coating is obtained by heat treatment of a fluorosilicone composite emulsion.

[0041] The raw materials for the fluorosilicone composite emulsion include: 180g of fluorosilicone rubber emulsion, 12g of silica aerogel, 1.7g of 3,3,3-trifluoropropylmethyldimethoxysilane, 1.5g of boron nitride nanowires, 4g of alumina aerogel, 8g of mica powder, 25g of octa(trimethylsiloxy)cubic siloxane, and 0.7g of cerium oxide nanoparticles.

[0042] The preparation method of the above-mentioned heat-insulating silicone resin glass fiber sleeve includes the following steps:

[0043] S1. Mix 3,3,3-trifluoropropylmethyldimethoxysilane, boron nitride nanowires and silica aerogel, and stir at 105℃ for 80 min at a stirring speed of 180 r / min; then add to fluorosilicone rubber emulsion and ultrasonically disperse for 40 min at an ultrasonic frequency of 85 kHz to obtain reinforced fluorosilicone emulsion.

[0044] S2. Add cerium oxide nanoparticles, mica powder, octa(trimethylsiloxy) cubic siloxane, and alumina aerogel to the reinforced fluorosilicone emulsion and mix evenly to obtain a composite emulsion.

[0045] The composite emulsion was coated onto the glass fiber sleeve with a coating thickness of 70 μm; it was then heat-treated at 58 °C for 12 min, dried at 108 °C for 8 min, and heat-treated at 148 °C for 8 min. Example 4

[0046] A heat-insulating silicone resin glass fiber sleeve includes: a glass fiber sleeve and a fluorosilicone composite coating covering the outside of the glass fiber sleeve; the fluorosilicone composite coating is obtained by heat treatment of a fluorosilicone composite emulsion.

[0047] The raw materials for the fluorosilicone composite emulsion include: 170g of fluorosilicone rubber emulsion, 18g of silica aerogel, 1.3g of 3,3,3-trifluoropropylmethyldimethoxysilane, 2.5g of boron nitride nanowires, 2g of alumina aerogel, 12g of mica powder, 15g of octa(trimethylsiloxy)cubic siloxane, and 0.8g of cerium oxide nanoparticles.

[0048] The preparation method of the above-mentioned heat-insulating silicone resin glass fiber sleeve includes the following steps:

[0049] S1. Mix 3,3,3-trifluoropropylmethyldimethoxysilane, boron nitride nanowires and silica aerogel, and stir at 110℃ for 100 min at a stirring speed of 120 r / min; then add to fluorosilicone rubber emulsion and ultrasonically disperse for 50 min at an ultrasonic frequency of 75 kHz to obtain reinforced fluorosilicone emulsion.

[0050] S2. Add cerium oxide nanoparticles, mica powder, octa(trimethylsiloxy) cubic siloxane, and alumina aerogel to the reinforced fluorosilicone emulsion and mix evenly to obtain a composite emulsion.

[0051] The composite emulsion was coated onto the glass fiber sleeve with a coating thickness of 80 μm; it was then heat-treated at 52 °C for 18 min, dried at 102 °C for 12 min, and heat-treated at 142 °C for 12 min. Example 5

[0052] A heat-insulating silicone resin glass fiber sleeve includes: a glass fiber sleeve and a fluorosilicone composite coating covering the outside of the glass fiber sleeve; the fluorosilicone composite coating is obtained by heat treatment of a fluorosilicone composite emulsion.

[0053] The raw materials for the fluorosilicone composite emulsion include: 175g of fluorosilicone rubber emulsion, 15g of silica aerogel, 1.5g of 3,3,3-trifluoropropylmethyldimethoxysilane, 2g of boron nitride nanowires, 3g of alumina aerogel, 10g of mica powder, 20g of octa(trimethylsiloxy)cubic siloxane, and 0.75g of cerium oxide nanoparticles.

[0054] The preparation method of the above-mentioned heat-insulating silicone resin glass fiber sleeve includes the following steps:

[0055] S1. Mix 3,3,3-trifluoropropylmethyldimethoxysilane, boron nitride nanowires and silica aerogel, and stir at 110℃ for 90 min at a stirring speed of 150 r / min; then add to fluorosilicone rubber emulsion and ultrasonically disperse for 45 min at an ultrasonic frequency of 80 kHz to obtain reinforced fluorosilicone emulsion.

[0056] S2. Add cerium oxide nanoparticles, mica powder, octa(trimethylsiloxy) cubic siloxane, and alumina aerogel to the reinforced fluorosilicone emulsion and mix evenly to obtain a composite emulsion.

[0057] The composite emulsion was coated onto the glass fiber sleeve with a coating thickness of 75 μm; it was then heat-treated at 55 °C for 15 min, dried at 105 °C for 10 min, and heat-treated at 145 °C for 10 min.

[0058] Comparative Example 1

[0059] A heat-insulating silicone resin glass fiber sleeve includes: a glass fiber sleeve and a fluorosilicone composite coating covering the outside of the glass fiber sleeve; the fluorosilicone composite coating is obtained by heat treatment of a fluorosilicone composite emulsion.

[0060] The raw materials for the fluorosilicone composite emulsion include: 175g of fluorosilicone rubber emulsion, 15g of silica aerogel, 1.5g of 3,3,3-trifluoropropylmethyldimethoxysilane, 2g of boron nitride nanowires, 3g of alumina aerogel, 10g of mica powder, 20g of octa(trimethylsiloxy)cubic siloxane, and 0.75g of cerium oxide nanoparticles.

[0061] The preparation method of the above-mentioned heat-insulating silicone resin glass fiber sleeve includes the following steps:

[0062] S1. Mix 3,3,3-trifluoropropylmethyldimethoxysilane and silica aerogel, stir at 110℃ for 90 min at a stirring speed of 150 r / min; then add to fluorosilicone rubber emulsion and ultrasonically disperse for 45 min at an ultrasonic frequency of 80 kHz to obtain reinforced fluorosilicone emulsion.

[0063] S2. Add cerium oxide nanoparticles, mica powder, boron nitride nanowires, octa(trimethylsiloxy) cubic siloxane, and alumina aerogel to the reinforced fluorosilicone emulsion and mix evenly to obtain a composite emulsion.

[0064] The composite emulsion was coated onto the glass fiber sleeve with a coating thickness of 75 μm; it was then heat-treated at 55 °C for 15 min, dried at 105 °C for 10 min, and heat-treated at 145 °C for 10 min.

[0065] Comparative Example 2

[0066] A heat-insulating silicone resin glass fiber sleeve includes: a glass fiber sleeve and a fluorosilicone composite coating covering the outside of the glass fiber sleeve; the fluorosilicone composite coating is obtained by heat treatment of a fluorosilicone composite emulsion.

[0067] The raw materials for the fluorosilicone composite emulsion include: 175g of fluorosilicone rubber emulsion, 15g of silica aerogel, 1.5g of 3,3,3-trifluoropropylmethyldimethoxysilane, 2g of boron nitride nanowires, 3g of alumina aerogel, 10.75g of mica powder, and 20g of octa(trimethylsiloxy)cubic siloxane.

[0068] The preparation method of the above-mentioned heat-insulating silicone resin glass fiber sleeve includes the following steps:

[0069] S1. Mix 3,3,3-trifluoropropylmethyldimethoxysilane, boron nitride nanowires and silica aerogel, and stir at 110℃ for 90 min at a stirring speed of 150 r / min; then add to fluorosilicone rubber emulsion and ultrasonically disperse for 45 min at an ultrasonic frequency of 80 kHz to obtain reinforced fluorosilicone emulsion.

[0070] S2. Add mica powder, octa(trimethylsiloxy) cubic siloxane and alumina aerogel to the reinforced fluorosilicone emulsion and mix evenly to obtain a composite emulsion.

[0071] The composite emulsion was coated onto the glass fiber sleeve with a coating thickness of 75 μm; it was then heat-treated at 55 °C for 15 min, dried at 105 °C for 10 min, and heat-treated at 145 °C for 10 min.

[0072] The composite emulsions obtained in Example 5 and Comparative Examples 1-2 were coated onto a glass plate with a coating thickness of 75 μm. The plates were then heat-treated at 55°C for 15 min, dried at 105°C for 10 min, and heat-treated at 145°C for 10 min. The plates were then removed from the glass plate, and the tensile strength of the samples (type 4 dumbbell-shaped) obtained in each group was determined in accordance with GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber".

[0073] like Figure 1 As shown, the sample prepared using the composite emulsion obtained in Example 5 has the highest tensile strength, which is significantly better than that of Comparative Examples 1-2.

[0074] The outer wall of the glass fiber sleeves obtained in Example 5 and Comparative Examples 1-2 was heated using the outer flame of an alcohol torch. A thermometer was placed at the center of the sleeve, and the time required for the center of the sleeve to heat up to 150°C was recorded. The longer the time required, the better the thermal insulation performance of the sleeve.

[0075] like Figure 2 As shown, the glass fiber sleeve obtained in Example 5 required the longest time to heat to 150°C, which was significantly better than that of Comparative Examples 1-2.

[0076] The breakdown voltage of the glass fiber sleevings obtained in Example 5 and Comparative Examples 1-2 was tested using a withstand voltage tester. A bare copper rod with a wire gauge of 3.35mm × 8.5mm and a length of 300mm was used. Each set of glass fiber sleevings was fitted onto the rod, and the samples were covered with aluminum foil before the AC power frequency voltage breakdown test was conducted.

[0077] like Figure 3 As shown, the glass fiber sleeving obtained in Example 5 has the highest breakdown voltage, which is significantly better than that of Comparative Examples 1-2.

[0078] The reason for the above results is that this invention uses 3,3,3-trifluoropropylmethyldimethoxysilane to graft silica aerogel. After grafting, the silica structure is similar to the molecular chain structure of fluorosilicone, which not only significantly improves the compatibility of silica aerogel with fluorosilicone rubber particles and provides good dispersion performance in emulsions, but also forms a three-dimensional porous framework with alumina aerogel. This effectively restricts the movement of air molecules, resulting in excellent thermal insulation performance. Furthermore, it complements the rigid structure of octa(trimethylsiloxy)cubic siloxane, enhancing the stability of the aerogel network and providing excellent mechanical properties at low density. This invention also dopes and combines boron nitride nanowires and cerium oxide nanoparticles into fluorosilicone rubber particles, reducing interfacial thermal resistance in the fluorosilicone polymer matrix. Simultaneously, the cerium oxide nanoparticles undergo Ce2 oxidation at high temperatures. 3+ / Ce 4+ The valence state can be reversibly converted, which can repair microscopic defects caused by partial discharge and maintain dielectric integrity.

[0079] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A heat-insulating silicone resin fiberglass sleeve, characterized in that, include: Fiberglass sleeve and fluorosilicone composite coating covering the outside of the fiberglass sleeve; Fluorosilicone composite coating is obtained by heat treatment of fluorosilicone composite emulsion; The raw materials for the fluorosilicone composite emulsion include, by weight, 150-200 parts of fluorosilicone rubber emulsion, 10-20 parts of silica aerogel, 1-2 parts of 3,3,3-trifluoropropylmethyldimethoxysilane, 1-3 parts of boron nitride nanowires, 1-5 parts of alumina aerogel, 5-15 parts of mica powder, 10-30 parts of octa(trimethylsiloxy)cubic siloxane, and 0.5-1 parts of cerium oxide nanoparticles. The fluorosilicone composite emulsion is prepared by the following steps: 3,3,3-trifluoropropylmethyldimethoxysilane, boron nitride nanowires, and silica aerogel are mixed; then added to the fluorosilicone rubber emulsion and ultrasonically dispersed to obtain a reinforced fluorosilicone emulsion; cerium oxide nanoparticles, mica powder, octa(trimethylsiloxy)cubic siloxane, and alumina aerogel are added to the reinforced fluorosilicone emulsion and mixed evenly.

2. The heat-insulating silicone resin glass fiber sleeve according to claim 1, characterized in that, The solid content of fluorosilicone rubber emulsion is 30-50%.

3. The heat-insulating silicone resin glass fiber sleeve according to claim 1, characterized in that, The particle size of silica aerogel is 50-100 nm, and the specific surface area is 600-700 m². 2 / g.

4. The heat-insulating silicone resin glass fiber sleeve according to claim 1, characterized in that, The aspect ratio of boron nitride nanowires is 50-100:

1.

5. The heat-insulating silicone resin glass fiber sleeve according to claim 1, characterized in that, The pore size of alumina aerogel is 1-5 nm, and the specific surface area is 300-400 m². 2 / g.

6. The thermally insulating silicone resin fiberglass sleeve according to claim 1, characterized in that, The particle size of mica powder is 10-50μm.

7. The thermally insulating silicone resin fiberglass sleeve according to claim 1, characterized in that, The cerium oxide nanoparticles have a particle size of 10-50 nm.

8. A method for preparing a heat-insulating silicone resin glass fiber sleeve as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Mix 3,3,3-trifluoropropylmethyldimethoxysilane, boron nitride nanowires, and silica aerogel, and stir at 100-110℃ for 1-2 hours; then add to the fluorosilicone rubber emulsion and ultrasonically disperse for 30-60 minutes to obtain the reinforced fluorosilicone emulsion. S2. Add cerium oxide nanoparticles, mica powder, octa(trimethylsiloxy) cubic siloxane, and alumina aerogel to the reinforced fluorosilicone emulsion and mix evenly to obtain a composite emulsion; coat the composite emulsion onto a glass fiber sleeve, heat treat at 50-60℃ for 10-20 min, dry at 120-140℃ for 5-15 min, and heat treat at 160-180℃ for 5-15 min.

9. The method for preparing the heat-insulating silicone resin glass fiber sleeve according to claim 8, characterized in that, In S1, the ultrasonic frequency is 70-90kHz.

10. The method for preparing the heat-insulating silicone resin glass fiber sleeve according to claim 8, characterized in that, In S2, the composite emulsion coating thickness is 50-100μm.

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