A ceramifiable silicone rubber, its preparation method and use

Abstract

This invention discloses a ceramicized silicone rubber, its preparation method, and its applications. The ceramicized silicone rubber comprises the following components in parts by weight: 100 parts silicone rubber, 90-180 parts composite filler, 10-40 parts silica, 5-20 parts zinc borate, 0.5-2 parts crosslinking agent, and 2-5 parts hydroxyl silicone oil. The ceramicized silicone rubber includes silane coupling agent-modified aluminum nitride, aluminum hydroxide, glass powder, and manganese dioxide in a weight ratio of 1:(1.2-3.0):(0.6-2.0):(0.10-0.27). The ceramicized silicone rubber of this invention exhibits high thermal conductivity and flame retardant properties.

Description

Technical Field

[0001] This invention relates to the field of materials technology, and more specifically, to a ceramicized silicone rubber, its preparation method, and its application. Background Technology

[0002] With the rapid development of the power industry and the continuous expansion of power transmission and distribution networks, the demand for cables has increased dramatically. Cable joints, as key components connecting cables and forming circuits, are among the weakest links in the entire power supply system due to their complex structure and demanding installation requirements. The contact resistance at cable joints generates significant Joule heat during long-term operation, causing the joint temperature to be significantly higher than that of the cable itself. If this heat cannot be dissipated in time, a vicious cycle will occur: increased temperature → further increased contact resistance → a sharp rise in temperature, accelerating the thermal aging of the cable insulation material, ultimately leading to cable failures such as insulation breakdown, short circuits, and even arcing fires, causing enormous economic losses and social impact.

[0003] To address this challenge, fire-resistant tape (or fire-resistant wrapping tape) is widely used for wrapping and protecting cable joints. Ceramicized silicone rubber is a new type of fire-resistant material. At room temperature, it possesses the flexibility of rubber, but when exposed to flame, it transforms into a hard ceramic protective layer, effectively isolating the flame. It is commonly used in the manufacture of fire-resistant tape (or fire-resistant wrapping tape). However, traditional ceramicized silicone rubber typically has poor thermal conductivity and cannot effectively dissipate the heat generated at cable joints during normal operation, thus providing "passive fire protection" rather than "active prevention." Furthermore, with the development of the power industry, higher requirements are being placed on the flame-retardant properties of ceramicized silicone rubber.

[0004] Therefore, developing a ceramicized silicone rubber with high thermal conductivity and flame retardant properties is of great significance. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a ceramicized silicone rubber, its preparation method, and its application.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a ceramicized silicone rubber comprising the following components in parts by weight: 100 parts silicone rubber, 90-180 parts composite filler, 10-40 parts silica, 5-20 parts zinc borate, 0.5-2 parts crosslinking agent, 2-5 parts hydroxyl silicone oil; The ceramicized silicone rubber comprises silane coupling agent modified aluminum nitride, aluminum hydroxide, glass powder, and manganese dioxide in a weight ratio of 1:(1.2-3.0):(0.6-2.0):(0.10-0.27).

[0007] In the composite filler of this invention, the silane coupling agent-modified aluminum nitride exhibits excellent compatibility with components such as silicone rubber, reducing thermal resistance, preventing agglomeration, and forming a continuous thermal conduction path with aluminum hydroxide and glass powder, which is beneficial for improving the thermal conductivity of ceramicized silicone rubber. Aluminum hydroxide, at high temperatures, endothermicly decomposes to release water of crystallization, cooling and generating Al2O3 to form a flame-retardant barrier. Simultaneously, Al2O3 fills the gaps between the silane coupling agent-modified aluminum nitride particles, optimizing the continuity of thermal conductivity and improving both the thermal conductivity and flame-retardant properties of the ceramicized silicone rubber. Glass powder melts at high temperatures to form a glassy substance, which can fill the gaps between the silane coupling agent-modified aluminum nitride, aluminum hydroxide, and other components, simultaneously improving both thermal conductivity and flame-retardant properties. Manganese dioxide not only catalyzes the decomposition of aluminum hydroxide and the melting of glass powder, and promotes Al2O3 crystallization, but also improves the dispersibility of the silane coupling agent-modified aluminum nitride and the interfacial bonding force between components, which is beneficial for improving the thermal conductivity and flame-retardant properties of the ceramicized silicone rubber. By modifying aluminum nitride, aluminum hydroxide, glass powder, and manganese dioxide with silane coupling agents in specific weight ratios, the individual effects of these components can be fully utilized, thereby improving the thermal conductivity and flame retardant properties of ceramicized silicone rubber.

[0008] Preferably, the ceramicized silicone rubber comprises silane coupling agent modified aluminum nitride, aluminum hydroxide, glass powder, and manganese dioxide in a weight ratio of 1:(1.3-2.9):(0.7-1.9):(0.11-0.26).

[0009] Preferably, the ceramicized silicone rubber comprises silane coupling agent modified aluminum nitride, aluminum hydroxide, glass powder, and manganese dioxide in a weight ratio of 1:(1.4-2.8):(0.8-1.8):(0.12-0.25).

[0010] Preferably, the weight ratio of the silane coupling agent modified aluminum nitride, aluminum hydroxide, glass powder and manganese dioxide is one or any two of the following: 1:1.4:1.3:0.19, 1:2:0.8:0.19, 1:2:1.3:0.12, 1:2:1.3:0.19, 1:2:1.3:0.25, 1:2:1.8:0.19, 1:2.8:1.3:0.19.

[0011] Preferably, the weight ratio of the silane coupling agent modified aluminum nitride, aluminum hydroxide, glass powder and manganese dioxide is 1:(2-2.8):(1.3-1.8):(0.19-0.25).

[0012] Preferably, the method for preparing the silane coupling agent modified aluminum nitride is as follows: aluminum nitride and silane coupling agent are added to a solvent and subjected to heat treatment to obtain silane coupling agent modified aluminum nitride.

[0013] More preferably, the solvent includes at least one of water, ethanol, methanol, isopropanol, propylene glycol, ethylene glycol, acetone, ethyl acetate, and N,N-dimethylformamide (DMF).

[0014] More preferably, the volume ratio of the solvent to the mass of aluminum nitride is 100 mL:(8-25) g.

[0015] More preferably, the volume ratio of the solvent to the mass of aluminum nitride is one or any two of the following: 100mL:8g, 100mL:9g, 100mL:10g, 100mL:11g, 100mL:12g, 100mL:13g, 100mL:14g, 100mL:15g, 100mL:16g, 100mL:17g, 100mL:18g, 100mL:19g, 100mL:20g, 100mL:21g, 100mL:22g, 100mL:23g, 100mL:24g, and 100mL:25g.

[0016] More preferably, the silane coupling agent comprises at least one of 3-aminopropyltriethoxysilane (KH-550, CAS No.: 919-30-2), γ-glycidoxypropyltrimethoxysilane (KH-560, CAS No.: 2530-83-8), γ-methacryloyloxypropyltrimethoxysilane (KH-570, CAS No.: 2530-85-0), 3-mercaptopropyltriethoxysilane (KH-580, CAS No.: 14814-09-6), and 3-ureapropyltriethoxysilane (KH-590, CAS No.: 23843-64-3).

[0017] More preferably, the weight ratio of the aluminum nitride to the silane coupling agent is 100:(0.7-1.8), specifically 100:(1-1.5).

[0018] More preferably, the weight ratio of the aluminum nitride and the silane coupling agent is one of or between any two of the following: 100:0.7, 100:1, 100:1.2, 100:1.3, 100:1.4, 100:1.5, 100:1.6, 100:1.7, and 100:1.8.

[0019] More preferably, the heat treatment temperature is 60-80℃, specifically 75℃.

[0020] More preferably, the temperature of the heat treatment is a range of one or any two of the following: 60°C, 61°C, 62°C, 63°C, 64°C, 65°C, 66°C, 67°C, 68°C, 69°C, 70°C, 71°C, 72°C, 73°C, 74°C, 75°C, 76°C, 77°C, 78°C, 79°C, and 80°C.

[0021] Preferably, the silane coupling agent modified aluminum nitride comprises silane coupling agent modified aluminum nitride A and silane coupling agent modified aluminum nitride B in a weight ratio of 1:(0.5-2), wherein the average particle size of silane coupling agent modified aluminum nitride A is 0.5-7 μm, and the average particle size of silane coupling agent modified aluminum nitride B is 15-55 μm.

[0022] More preferably, the weight ratio of the silane coupling agent modified aluminum nitride A and the silane coupling agent modified aluminum nitride B is one of or between any two of the following: 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9, and 1:2.

[0023] More preferably, the weight ratio of the silane coupling agent modified aluminum nitride A and the silane coupling agent modified aluminum nitride B is 1:(1-1.5).

[0024] More preferably, the average particle size of the silane coupling agent modified aluminum nitride A is a range of one or any two of the following: 0.5 μm, 0.8 μm, 1 μm, 1.3 μm, 1.5 μm, 1.8 μm, 2 μm, 2.3 μm, 2.5 μm, 2.8 μm, 3 μm, 3.3 μm, 3.5 μm, 3.8 μm, 4 μm, 4.3 μm, 4.5 μm, 5 μm, 5.5 μm, 6 μm, 6.5 μm, and 7 μm.

[0025] More preferably, the average particle size of the silane coupling agent modified aluminum nitride A is (2-4) μm.

[0026] More preferably, the average particle size of the silane coupling agent modified aluminum nitride B is a range of one or any two of the following: 15μm, 18μm, 20μm, 23μm, 25μm, 27μm, 28μm, 30μm, 33μm, 35μm, 37μm, 38μm, 40μm, 43μm, 45μm, 47μm, 48μm, 50μm, 53μm, and 55μm.

[0027] More preferably, the average particle size of the silane coupling agent modified aluminum nitride B is (25-45) μm.

[0028] In this invention, the average particle size of the silane coupling agent modified aluminum nitride A and / or silane coupling agent modified aluminum nitride B is measured by using a laser particle size analyzer (Mastersizer 3000) to perform particle size distribution analysis on the silane coupling agent modified aluminum nitride A and / or silane coupling agent modified aluminum nitride B, and using the Dv50 size as the average particle size of the silane coupling agent modified aluminum nitride A and / or silane coupling agent modified aluminum nitride B.

[0029] Preferably, the aluminum hydroxide has an average particle size of 1-20 μm.

[0030] Preferably, the average particle size of the aluminum hydroxide is a range of one or any two of the following: 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, and 20 μm.

[0031] More preferably, the aluminum hydroxide has an average particle size of 1-15 μm.

[0032] More preferably, the aluminum hydroxide has an average particle size of 8-15 μm.

[0033] Preferably, the average particle size of the glass powder is ≤20μm, specifically (1-20)μm.

[0034] Preferably, the average particle size of the glass powder is a range of one or any two of the following: 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, 19μm, and 20μm.

[0035] More preferably, the average particle size of the glass powder is (3-12) μm.

[0036] Preferably, the average particle size of the manganese dioxide is (0.1-4) μm.

[0037] Preferably, the average particle size of the manganese dioxide is one or any two of the following: 0.1 μm, 0.2 μm, 0.3 μm, 0.5 μm, 0.8 μm, 1 μm, 1.3 μm, 1.5 μm, 1.8 μm, 2 μm, 2.3 μm, 2.5 μm, 2.8 μm, 3 μm, 3.3 μm, 3.5 μm, 3.8 μm, and 4 μm.

[0038] More preferably, the average particle size of the manganese dioxide is (0.5-3) μm.

[0039] In this invention, the average particle size of aluminum hydroxide, glass powder, or manganese dioxide is measured by using a laser particle size analyzer (Mastersizer 3000) to analyze the particle size distribution of aluminum hydroxide, glass powder, or manganese dioxide, and using the Dv50 size as the average particle size of aluminum hydroxide, glass powder, or manganese dioxide.

[0040] Preferably, the silica is fumed silica and / or precipitated silica.

[0041] Preferably, the silica has a mesh size of 1000-5000 mesh.

[0042] Preferably, the mesh size of the silica is one of 1000 mesh, 1250 mesh, 1500 mesh, 2000 mesh, 2500 mesh, 3000 mesh, 3500 mesh, 4000 mesh, 4500 mesh, 5000 mesh, or any value between two of them.

[0043] Preferably, the crosslinking agent is a peroxide vulcanizing agent.

[0044] Commonly used peroxide vulcanizing agents in this field can be used in this invention. For example, the peroxide vulcanizing agent includes at least one of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane and dicumyl peroxide (DCP).

[0045] In this field, hydroxyl-terminated silicone oil refers to hydroxyl-terminated polydimethylsiloxane.

[0046] Preferably, the silicone rubber comprises methyl vinyl silicone rubber and / or methyl phenyl vinyl silicone rubber.

[0047] Preferably, the Mooney viscosity of the silicone rubber is 30-65 ML(1+4)100℃.

[0048] Preferably, the Mooney viscosity of the silicone rubber is a range of one or any two of the following: 30ML(1+4)100℃, 33ML(1+4)100℃, 35ML(1+4)100℃, 37ML(1+4)100℃, 38ML(1+4)100℃, 40ML(1+4)100℃, 43ML(1+4)100℃, 45ML(1+4)100℃, 48ML(1+4)100℃, 50ML(1+4)100℃, 53ML(1+4)100℃, 55ML(1+4)100℃, 58ML(1+4)100℃, 60ML(1+4)100℃, 63ML(1+4)100℃, and 65ML(1+4)100℃.

[0049] More preferably, the Mooney viscosity of the silicone rubber is 35-60 ML(1+4)100℃.

[0050] In this invention, the Mooney viscosity of the silicone rubber is tested with reference to the GB / T 1232.1-2016 standard.

[0051] Preferably, in the ceramicized silicone rubber, the weight percentage of silicone rubber is 100 parts, and the weight percentage of ceramicized silicone rubber is within the range of one or any two of 90, 100, 110, 120, 130, 135, 140, 150, 160, 170, and 180 parts; the weight percentage of silica is within the range of one or any two of 10, 15, 20, 25, 30, 35, and 40 parts; and the weight percentage of zinc borate is... The weight percentages are 5 parts, 8 parts, 10 parts, 13 parts, 15 parts, 18 parts, 20 parts, or any combination thereof; the weight percentages of the crosslinking agent are 0.5 parts, 0.7 parts, 0.8 parts, 1 part, 1.2 parts, 1.3 parts, 1.5 parts, 1.7 parts, 1.8 parts, 2 parts, or any combination thereof; and the weight percentages of the hydroxyl silicone oil are 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, or any combination thereof.

[0052] Secondly, the present invention provides a method for preparing ceramicized silicone rubber, comprising the following steps: Mix the components, melt and extrude to obtain ceramicized silicone rubber.

[0053] Preferably, a twin-screw extruder is used for the melt extrusion.

[0054] More preferably, the length-to-diameter ratio of the twin-screw extruder is (36-48):1.

[0055] More preferably, the temperature of the twin-screw extruder is 110-130℃ in zone one, 130-150℃ in zone two, 150-170℃ in zone three, 160-180℃ in zone four, and 150-170℃ in zone five.

[0056] Thirdly, the present invention provides an application of ceramicized silicone rubber in fire-retardant materials.

[0057] Fourthly, the present invention provides a fireproof belt comprising ceramicized silicone rubber.

[0058] Fifthly, the present invention provides a method for preparing a fireproof belt, comprising the following steps: The fireproof belt is obtained by extruding ceramicized silicone rubber into a strip and then vulcanizing it.

[0059] Preferably, the extrusion temperature is 140-160°C.

[0060] Preferably, the extrusion temperature is one or any two of the following: 140°C, 141°C, 142°C, 143°C, 144°C, 145°C, 146°C, 147°C, 148°C, 149°C, 150°C, 151°C, 152°C, 153°C, 154°C, 155°C, 156°C, 157°C, 158°C, 159°C, and 160°C.

[0061] Preferably, the vulcanization temperature is 160-200℃.

[0062] Preferably, the temperature of the vulcanization treatment is a range of one or any two of the following: 160℃, 161℃, 162℃, 163℃, 164℃, 165℃, 166℃, 167℃, 168℃, 169℃, 170℃, 171℃, 172℃, 173℃, 174℃, 175℃, 176℃, 177℃, 178℃, 179℃, 180℃, 181℃, 182℃, 183℃, 184℃, 185℃, 186℃, 187℃, 188℃, 189℃, 190℃, 191℃, 192℃, 193℃, 194℃, 195℃, 196℃, 197℃, 198℃, 199℃, and 200℃.

[0063] Preferably, the vulcanization treatment time is 1-20 minutes, specifically 1-10 minutes.

[0064] Preferably, the vulcanization time is one or any two of the following: 1 min, 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, 11 min, 12 min, 13 min, 14 min, 15 min, 16 min, 17 min, 18 min, 19 min, and 20 min.

[0065] Compared with the prior art, the beneficial effects of the present invention are as follows: In the composite filler of this invention, the silane coupling agent-modified aluminum nitride exhibits excellent compatibility with components such as silicone rubber, reducing thermal resistance, preventing agglomeration, and forming a continuous thermal conduction path with aluminum hydroxide and glass powder, which is beneficial for improving the thermal conductivity of ceramicized silicone rubber. Aluminum hydroxide, at high temperatures, endothermicly decomposes to release water of crystallization, cooling and generating Al2O3 to form a flame-retardant barrier. Simultaneously, Al2O3 fills the gaps between the silane coupling agent-modified aluminum nitride particles, optimizing the continuity of thermal conductivity and improving both the thermal conductivity and flame-retardant properties of the ceramicized silicone rubber. Glass powder melts at high temperatures to form a glassy substance, which can fill the gaps between the silane coupling agent-modified aluminum nitride, aluminum hydroxide, and other components, simultaneously improving both thermal conductivity and flame-retardant properties. Manganese dioxide not only catalyzes the decomposition of aluminum hydroxide and the melting of glass powder, and promotes Al2O3 crystallization, but also improves the dispersibility of the silane coupling agent-modified aluminum nitride and the interfacial bonding force between components, which is beneficial for improving the thermal conductivity and flame-retardant properties of the ceramicized silicone rubber. By modifying aluminum nitride, aluminum hydroxide, glass powder, and manganese dioxide with silane coupling agents in specific weight ratios, the individual effects of these components can be fully utilized, thereby improving the thermal conductivity and flame retardant properties of ceramicized silicone rubber. Detailed Implementation

[0066] In a first aspect, the present invention provides a ceramicized silicone rubber comprising the following components in parts by weight: 100 parts silicone rubber, 90-180 parts composite filler, 10-40 parts silica, 5-20 parts zinc borate, 0.5-2 parts crosslinking agent, 2-5 parts hydroxyl silicone oil; The ceramicized silicone rubber comprises silane coupling agent modified aluminum nitride, aluminum hydroxide, glass powder, and manganese dioxide in a weight ratio of 1:(1.2-3.0):(0.6-2.0):(0.10-0.27).

[0067] In the composite filler of this invention, the silane coupling agent-modified aluminum nitride exhibits excellent compatibility with components such as silicone rubber, reducing thermal resistance, preventing agglomeration, and forming a continuous thermal conduction path with aluminum hydroxide and glass powder, which is beneficial for improving the thermal conductivity of ceramicized silicone rubber. Aluminum hydroxide, at high temperatures, endothermicly decomposes to release water of crystallization, cooling and generating Al2O3 to form a flame-retardant barrier. Simultaneously, Al2O3 fills the gaps between the silane coupling agent-modified aluminum nitride particles, optimizing the continuity of thermal conductivity and improving both the thermal conductivity and flame-retardant properties of the ceramicized silicone rubber. Glass powder melts at high temperatures to form a glassy substance, which can fill the gaps between the silane coupling agent-modified aluminum nitride, aluminum hydroxide, and other components, simultaneously improving both thermal conductivity and flame-retardant properties. Manganese dioxide not only catalyzes the decomposition of aluminum hydroxide and the melting of glass powder, and promotes Al2O3 crystallization, but also improves the dispersibility of the silane coupling agent-modified aluminum nitride and the interfacial bonding force between components, which is beneficial for improving the thermal conductivity and flame-retardant properties of the ceramicized silicone rubber. By modifying aluminum nitride, aluminum hydroxide, glass powder, and manganese dioxide with silane coupling agents in specific weight ratios, the individual effects of these components can be fully utilized, thereby improving the thermal conductivity and flame retardant properties of ceramicized silicone rubber.

[0068] Preferably, the ceramicized silicone rubber comprises silane coupling agent modified aluminum nitride, aluminum hydroxide, glass powder, and manganese dioxide in a weight ratio of 1:(1.3-2.9):(0.7-1.9):(0.11-0.26).

[0069] Preferably, the ceramicized silicone rubber comprises silane coupling agent modified aluminum nitride, aluminum hydroxide, glass powder, and manganese dioxide in a weight ratio of 1:(1.4-2.8):(0.8-1.8):(0.12-0.25).

[0070] Preferably, the weight ratio of the silane coupling agent modified aluminum nitride, aluminum hydroxide, glass powder and manganese dioxide is one or any two of the following: 1:1.4:1.3:0.19, 1:2:0.8:0.19, 1:2:1.3:0.12, 1:2:1.3:0.19, 1:2:1.3:0.25, 1:2:1.8:0.19, 1:2.8:1.3:0.19.

[0071] Preferably, the weight ratio of the silane coupling agent modified aluminum nitride, aluminum hydroxide, glass powder and manganese dioxide is 1:(2-2.8):(1.3-1.8):(0.19-0.25).

[0072] Preferably, the method for preparing the silane coupling agent modified aluminum nitride is as follows: aluminum nitride and silane coupling agent are added to a solvent and subjected to heat treatment to obtain silane coupling agent modified aluminum nitride.

[0073] More preferably, the solvent includes at least one of water, ethanol, methanol, isopropanol, propylene glycol, ethylene glycol, acetone, ethyl acetate, and N,N-dimethylformamide (DMF).

[0074] More preferably, the volume ratio of the solvent to the mass of aluminum nitride is 100 mL:(8-25) g.

[0075] More preferably, the volume ratio of the solvent to the mass of aluminum nitride is one or any two of the following: 100mL:8g, 100mL:9g, 100mL:10g, 100mL:11g, 100mL:12g, 100mL:13g, 100mL:14g, 100mL:15g, 100mL:16g, 100mL:17g, 100mL:18g, 100mL:19g, 100mL:20g, 100mL:21g, 100mL:22g, 100mL:23g, 100mL:24g, and 100mL:25g.

[0076] More preferably, the silane coupling agent comprises at least one of 3-aminopropyltriethoxysilane (KH-550, CAS No.: 919-30-2), γ-glycidoxypropyltrimethoxysilane (KH-560, CAS No.: 2530-83-8), γ-methacryloyloxypropyltrimethoxysilane (KH-570, CAS No.: 2530-85-0), 3-mercaptopropyltriethoxysilane (KH-580, CAS No.: 14814-09-6), and 3-ureapropyltriethoxysilane (KH-590, CAS No.: 23843-64-3).

[0077] More preferably, the weight ratio of the aluminum nitride to the silane coupling agent is 100:(0.7-1.8), specifically 100:(1-1.5).

[0078] More preferably, the weight ratio of the aluminum nitride and the silane coupling agent is one of or between any two of the following: 100:0.7, 100:1, 100:1.2, 100:1.3, 100:1.4, 100:1.5, 100:1.6, 100:1.7, and 100:1.8.

[0079] More preferably, the heat treatment temperature is 60-80°C, specifically 75°C.

[0080] More preferably, the temperature of the heat treatment is a range of one or any two of the following: 60°C, 61°C, 62°C, 63°C, 64°C, 65°C, 66°C, 67°C, 68°C, 69°C, 70°C, 71°C, 72°C, 73°C, 74°C, 75°C, 76°C, 77°C, 78°C, 79°C, and 80°C.

[0081] Preferably, the silane coupling agent modified aluminum nitride comprises silane coupling agent modified aluminum nitride A and silane coupling agent modified aluminum nitride B in a weight ratio of 1:(0.5-2), wherein the average particle size of silane coupling agent modified aluminum nitride A is 0.5-7 μm, and the average particle size of silane coupling agent modified aluminum nitride B is 15-55 μm.

[0082] More preferably, the weight ratio of the silane coupling agent modified aluminum nitride A and the silane coupling agent modified aluminum nitride B is one of or between any two of the following: 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9, and 1:2.

[0083] More preferably, the weight ratio of the silane coupling agent modified aluminum nitride A and the silane coupling agent modified aluminum nitride B is 1:(1-1.5).

[0084] More preferably, the average particle size of the silane coupling agent modified aluminum nitride A is a range of one or any two of the following: 0.5 μm, 0.8 μm, 1 μm, 1.3 μm, 1.5 μm, 1.8 μm, 2 μm, 2.3 μm, 2.5 μm, 2.8 μm, 3 μm, 3.3 μm, 3.5 μm, 3.8 μm, 4 μm, 4.3 μm, 4.5 μm, 5 μm, 5.5 μm, 6 μm, 6.5 μm, and 7 μm.

[0085] More preferably, the average particle size of the silane coupling agent modified aluminum nitride A is (2-4) μm.

[0086] More preferably, the average particle size of the silane coupling agent modified aluminum nitride B is a range of one or any two of the following: 15μm, 18μm, 20μm, 23μm, 25μm, 27μm, 28μm, 30μm, 33μm, 35μm, 37μm, 38μm, 40μm, 43μm, 45μm, 47μm, 48μm, 50μm, 53μm, and 55μm.

[0087] More preferably, the average particle size of the silane coupling agent modified aluminum nitride B is (25-45) μm.

[0088] In this invention, the average particle size of the silane coupling agent modified aluminum nitride A and / or silane coupling agent modified aluminum nitride B is measured by using a laser particle size analyzer (Mastersizer 3000) to perform particle size distribution analysis on the silane coupling agent modified aluminum nitride A and / or silane coupling agent modified aluminum nitride B, and using the Dv50 size as the average particle size of the silane coupling agent modified aluminum nitride A and / or silane coupling agent modified aluminum nitride B.

[0089] Preferably, the aluminum hydroxide has an average particle size of 1-20 μm.

[0090] Preferably, the average particle size of the aluminum hydroxide is a range of one or any two of the following: 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, and 20 μm.

[0091] More preferably, the aluminum hydroxide has an average particle size of 1-15 μm.

[0092] More preferably, the aluminum hydroxide has an average particle size of 8-15 μm.

[0093] Preferably, the average particle size of the glass powder is ≤20μm, specifically (1-20)μm.

[0094] Preferably, the average particle size of the glass powder is a range of one or any two of the following: 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, 19μm, and 20μm.

[0095] More preferably, the average particle size of the glass powder is (3-12) μm.

[0096] Preferably, the average particle size of the manganese dioxide is (0.1-4) μm.

[0097] Preferably, the average particle size of the manganese dioxide is one or any two of the following: 0.1 μm, 0.2 μm, 0.3 μm, 0.5 μm, 0.8 μm, 1 μm, 1.3 μm, 1.5 μm, 1.8 μm, 2 μm, 2.3 μm, 2.5 μm, 2.8 μm, 3 μm, 3.3 μm, 3.5 μm, 3.8 μm, and 4 μm.

[0098] More preferably, the average particle size of the manganese dioxide is (0.5-3) μm.

[0099] In this invention, the average particle size of aluminum hydroxide, glass powder, or manganese dioxide is measured by using a laser particle size analyzer (Mastersizer 3000) to analyze the particle size distribution of aluminum hydroxide, glass powder, or manganese dioxide, and using the Dv50 size as the average particle size of aluminum hydroxide, glass powder, or manganese dioxide.

[0100] Preferably, the silica is fumed silica and / or precipitated silica.

[0101] Preferably, the silica has a mesh size of 1000-5000 mesh.

[0102] Preferably, the mesh size of the silica is one of 1000 mesh, 1250 mesh, 1500 mesh, 2000 mesh, 2500 mesh, 3000 mesh, 3500 mesh, 4000 mesh, 4500 mesh, 5000 mesh, or any value between two of them.

[0103] Preferably, the crosslinking agent is a peroxide vulcanizing agent.

[0104] Commonly used peroxide vulcanizing agents in this field can be used in this invention. For example, the peroxide vulcanizing agent includes at least one of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane and dicumyl peroxide (DCP).

[0105] In this field, hydroxyl-terminated silicone oil refers to hydroxyl-terminated polydimethylsiloxane.

[0106] Preferably, the silicone rubber comprises methyl vinyl silicone rubber and / or methyl phenyl vinyl silicone rubber.

[0107] Preferably, the Mooney viscosity of the silicone rubber is 30-65 ML(1+4)100℃.

[0108] Preferably, the Mooney viscosity of the silicone rubber is a range of one or any two of the following: 30ML(1+4)100℃, 33ML(1+4)100℃, 35ML(1+4)100℃, 37ML(1+4)100℃, 38ML(1+4)100℃, 40ML(1+4)100℃, 43ML(1+4)100℃, 45ML(1+4)100℃, 48ML(1+4)100℃, 50ML(1+4)100℃, 53ML(1+4)100℃, 55ML(1+4)100℃, 58ML(1+4)100℃, 60ML(1+4)100℃, 63ML(1+4)100℃, and 65ML(1+4)100℃.

[0109] More preferably, the Mooney viscosity of the silicone rubber is 35-60 ML(1+4)100℃.

[0110] In this invention, the Mooney viscosity of the silicone rubber is tested with reference to the GB / T 1232.1-2016 standard.

[0111] Preferably, in the ceramicized silicone rubber, the weight percentage of silicone rubber is 100 parts, and the weight percentage of ceramicized silicone rubber is within the range of one or any two of 90, 100, 110, 120, 130, 135, 140, 150, 160, 170, and 180 parts; the weight percentage of silica is within the range of one or any two of 10, 15, 20, 25, 30, 35, and 40 parts; and the weight percentage of zinc borate is... The weight percentages are 5 parts, 8 parts, 10 parts, 13 parts, 15 parts, 18 parts, 20 parts, or any combination thereof; the weight percentages of the crosslinking agent are 0.5 parts, 0.7 parts, 0.8 parts, 1 part, 1.2 parts, 1.3 parts, 1.5 parts, 1.7 parts, 1.8 parts, 2 parts, or any combination thereof; and the weight percentages of the hydroxyl silicone oil are 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, or any combination thereof.

[0112] Secondly, the present invention provides a method for preparing ceramicized silicone rubber, comprising the following steps: Mix the components, melt and extrude to obtain ceramicized silicone rubber.

[0113] Preferably, a twin-screw extruder is used for the melt extrusion.

[0114] More preferably, the length-to-diameter ratio of the twin-screw extruder is (36-48):1.

[0115] More preferably, the temperature of the twin-screw extruder is 110-130℃ in zone one, 130-150℃ in zone two, 150-170℃ in zone three, 160-180℃ in zone four, and 150-170℃ in zone five.

[0116] Thirdly, the present invention provides an application of ceramicized silicone rubber in fire-retardant materials.

[0117] Fourthly, the present invention provides a fireproof belt comprising ceramicized silicone rubber.

[0118] Fifthly, the present invention provides a method for preparing a fireproof belt, comprising the following steps: The fireproof belt is obtained by extruding ceramicized silicone rubber into a strip and then vulcanizing it.

[0119] Preferably, the extrusion temperature is 140-160°C.

[0120] Preferably, the extrusion temperature is one or any two of the following: 140°C, 141°C, 142°C, 143°C, 144°C, 145°C, 146°C, 147°C, 148°C, 149°C, 150°C, 151°C, 152°C, 153°C, 154°C, 155°C, 156°C, 157°C, 158°C, 159°C, and 160°C.

[0121] Preferably, the vulcanization temperature is 160-200℃.

[0122] Preferably, the temperature of the vulcanization treatment is a range of one or any two of the following: 160℃, 161℃, 162℃, 163℃, 164℃, 165℃, 166℃, 167℃, 168℃, 169℃, 170℃, 171℃, 172℃, 173℃, 174℃, 175℃, 176℃, 177℃, 178℃, 179℃, 180℃, 181℃, 182℃, 183℃, 184℃, 185℃, 186℃, 187℃, 188℃, 189℃, 190℃, 191℃, 192℃, 193℃, 194℃, 195℃, 196℃, 197℃, 198℃, 199℃, and 200℃.

[0123] Preferably, the vulcanization treatment time is 1-20 minutes, specifically 1-10 minutes.

[0124] Preferably, the vulcanization time is one or any two of the following: 1 min, 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, 11 min, 12 min, 13 min, 14 min, 15 min, 16 min, 17 min, 18 min, 19 min, and 20 min.

[0125] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0126] In the following examples, experimental methods without specific conditions are generally performed under conventional conditions in the art or as recommended by the manufacturer. Unless otherwise specified, all raw materials and reagents used are commercially available from the general market. Furthermore, unless otherwise specified, "parts" and "%" refer to mass measurements.

[0127] The reagents used in the various embodiments and comparative examples of this invention are as follows: Silicone Rubber-1, Methylphenyl Vinyl Silicone Rubber, Mooney Viscosity 48 ML (1+4) 100℃, IOTA-120, Anhui Aiyota Silicone Oil Co., Ltd.; Silicone Rubber-2, Methylphenyl Vinyl Silicone Rubber, Mooney Viscosity 58 ML (1+4) 100℃, MYR33, Anhui Mingyi Silicon Industry Co., Ltd.; Silicone rubber-3, methyl vinyl silicone rubber, Mooney viscosity 37 ML (1+4) 100℃, 110-3, Nanjing Dongjue Organosilicon Group; Silicone rubber-4, methyl vinyl silicone rubber, Mooney viscosity 65 ML (1+4) 100℃, 110-4, Nanjing Dongjue Organosilicon Group; Silicone rubber-5, methyl vinyl silicone rubber, Mooney viscosity 30 ML (1+4) 100℃, 110-5, Nanjing Dongjue Organosilicon Group; The preparation method of silane coupling agent modified aluminum nitride R is as follows: aluminum nitride (average particle size 10μm, A432362, Aladdin) and silane coupling agent (3-aminopropyltriethoxysilane, KH-550, CAS No.: 919-30-2) are added to a solvent (ethanol and water in a volume ratio of 1:1), heat-treated at 75℃ for 2h, filtered, and dried at 100℃ to constant weight to obtain silane coupling agent modified aluminum nitride R. The volume ratio of the solvent to the mass of aluminum nitride is 100mL:15g, and the weight ratio of aluminum nitride to silane coupling agent is 100:1.2. The preparation method of silane coupling agent modified aluminum nitride S is as follows: aluminum nitride (CAS: 24304-00-5, high-purity aluminum nitride with a particle size of 60 micrometers purchased from Hebei Tuweifa Metal Materials Co., Ltd., with product number TWF) and silane coupling agent (3-aminopropyltriethoxysilane, KH-550, CAS No.: 919-30-2) are added to a solvent (ethanol and water in a volume ratio of 1:1). The mixture is then heat-treated at 75°C for 2 hours, filtered, and dried at 100°C to constant weight to obtain silane coupling agent modified aluminum nitride S. The volume ratio of the solvent to the mass of aluminum nitride is 100mL:15g, and the weight ratio of aluminum nitride to silane coupling agent is 100:1.2. Silane coupling agent modified aluminum nitride A1, with an average particle size of 4 μm, was obtained by screening silane coupling agent modified aluminum nitride R. Silane coupling agent modified aluminum nitride A2, with an average particle size of 2μm, was obtained by screening silane coupling agent modified aluminum nitride R. Silane coupling agent modified aluminum nitride A3, with an average particle size of 7 μm, was obtained by screening silane coupling agent modified aluminum nitride R. Silane coupling agent modified aluminum nitride A4, with an average particle size of 0.5 μm, was obtained by screening silane coupling agent modified aluminum nitride R. Silane coupling agent modified aluminum nitride B1, with an average particle size of 35 μm, was obtained by screening silane coupling agent modified aluminum nitride S. Silane coupling agent modified aluminum nitride B2, with an average particle size of 45 μm, was obtained by screening silane coupling agent modified aluminum nitride S. Silane coupling agent modified aluminum nitride B3, with an average particle size of 25 μm, was obtained by screening silane coupling agent modified aluminum nitride S. Silane coupling agent modified aluminum nitride B4, with an average particle size of 55 μm, was obtained by screening silane coupling agent modified aluminum nitride S. Silane coupling agent modified aluminum nitride B5, with an average particle size of 15 μm, was obtained by screening silane coupling agent modified aluminum nitride S. Aluminum hydroxide-1, with an average particle size of 8 μm, was obtained by crushing 25 μm aluminum hydroxide (A800856, Maclean) and then screening it. Aluminum hydroxide-2, with an average particle size of 15 μm, is obtained by crushing 25 μm aluminum hydroxide (A800856, Maclean) and screening it. Aluminum hydroxide-3, with an average particle size of 1 μm, is obtained by crushing 25 μm aluminum hydroxide (A800856, Maclean) and then screening it. Aluminum hydroxide-4, with an average particle size of 20 μm, is obtained by crushing 25 μm aluminum hydroxide (A800856, Maclean) and then screening it. Glass powder-1, with an average particle size of 12μm, was obtained by crushing and screening 600-mesh glass powder purchased from Lingshou County Dongyan Mineral Products Co., Ltd. Glass powder-2, with an average particle size of 3μm, was obtained by crushing and screening 600-mesh glass powder purchased from Lingshou County Dongyan Mineral Products Co., Ltd. Glass powder-3, with an average particle size of 20μm, was obtained by crushing and screening 600-mesh glass powder purchased from Lingshou County Dongyan Mineral Products Co., Ltd. Manganese dioxide-1, with an average particle size of 1.8 μm, was obtained by crushing 200-mesh manganese dioxide (M689942, Maclean) and then screening it. Manganese dioxide-2, with an average particle size of 3μm, was obtained by crushing 200-mesh manganese dioxide (M689942, Maclean) and then screening it. Manganese dioxide-3, with an average particle size of 0.5 μm, was obtained by crushing 200-mesh manganese dioxide (M689942, Maclean) and then screening it. Manganese dioxide-4, with an average particle size of 4 μm, was obtained by crushing 200-mesh manganese dioxide (M689942, Maclean) and then screening it. Manganese dioxide-5, with an average particle size of 0.1 μm, was obtained by crushing 200-mesh manganese dioxide (M689942, Maclean) and then screening it. Silica, Precipitated silica, 1250 mesh, S915311, Maclean; Zinc borate, A668396, McLean; Crosslinking agent, peroxide vulcanizing agent, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, CAS No.: 78-63-7, commercially available; Hydroxyl silicone oil, hydroxyl-terminated polydimethylsiloxane, 768543, McLean; In this invention, the Mooney viscosity of the silicone rubber is tested with reference to the GB / T 1232.1-2016 standard; In this invention, the average particle size of the silane coupling agent modified aluminum nitride A or silane coupling agent modified aluminum nitride B is measured by using a laser particle size analyzer (Mastersizer 3000) to perform particle size distribution analysis on the silane coupling agent modified aluminum nitride A or silane coupling agent modified aluminum nitride B, and using the Dv50 size as the average particle size of the silane coupling agent modified aluminum nitride A or silane coupling agent modified aluminum nitride B. In this invention, the average particle size of aluminum hydroxide, glass powder, or manganese dioxide is measured by using a laser particle size analyzer (Mastersizer 3000) to analyze the particle size distribution of aluminum hydroxide, glass powder, or manganese dioxide, and using the Dv50 size as the average particle size of aluminum hydroxide, glass powder, or manganese dioxide.

[0128] Example 1 This embodiment provides a ceramicized silicone rubber, comprising the following components in parts by weight: 100 parts silicone rubber-1, 135 parts composite filler, 25 parts silica, 13 parts zinc borate, 1.3 parts crosslinking agent, 3.5 parts hydroxyl silicone oil; The ceramicized silicone rubber comprises silane coupling agent modified aluminum nitride, aluminum hydroxide-1, glass powder-1 and manganese dioxide-1 in a weight ratio of 1:2:1.3:0.19; The silane coupling agent modified aluminum nitride comprises silane coupling agent modified aluminum nitride A1 and silane coupling agent modified aluminum nitride B1 in a weight ratio of 1:1.5. The average particle size of the silane coupling agent modified aluminum nitride A1 is 4 μm, and the average particle size of the silane coupling agent modified aluminum nitride B1 is 35 μm. The average particle size of the aluminum hydroxide-1 is 8 μm, the average particle size of the glass powder-1 is 12 μm, and the average particle size of the manganese dioxide-1 is 1.8 μm. The preparation method of the above-mentioned ceramicized silicone rubber includes the following steps: All components except the crosslinking agent are put into zone one of the twin-screw extruder (length-to-diameter ratio of 40:1), while the crosslinking agent is put into zone five of the twin-screw extruder (length-to-diameter ratio of 40:1). The components are mixed and melt-extruded to obtain ceramicized silicone rubber. The temperature of the twin-screw extruder is 120°C in zone 1, 140°C in zone 2, 160°C in zone 3, 170°C in zone 4, and 160°C in zone 5. This embodiment also provides a fireproof belt, the preparation method of which includes the following steps: At 150°C, ceramicized silicone rubber is extruded into a strip using a coat hanger-type T-die (die lip width 500mm, gap 1.0mm), and then cast onto a cooling roller with a surface temperature of 25°C for shaping. Finally, it is vulcanized at 180°C for 5 minutes and cooled to obtain a fireproof strip with a thickness of 0.5mm.

[0129] Examples 2-7 and Comparative Examples 1-6 Examples 2-7 and Comparative Examples 1-6 provide different ceramicized silicone rubber and fireproof strips. The difference between them and Example 1 is that the weight ratio of silane coupling agent modified aluminum nitride, aluminum hydroxide-1, glass powder-1 and manganese dioxide-1 is different, as shown in Table 1. All other aspects are the same as in Example 1.

[0130] Table 1 Examples 8-12 Examples 8-12 provide different ceramicized silicone rubbers and fireproof strips. The difference between them and Example 1 is that the weight ratio of silane coupling agent modified aluminum nitride A1 and silane coupling agent modified aluminum nitride B1 is different, as shown in Table 2. All other aspects are the same as in Example 1.

[0131] Table 2 Examples 13-15 Examples 13-15 provide different ceramicized silicone rubbers and fireproof strips, which differ from Example 1 in that the type and average particle size of the silane coupling agent modified aluminum nitride A are different, as shown in Table 3. All other aspects are the same as in Example 1.

[0132] Table 3 Examples 16-19 Examples 16-19 provide different ceramicized silicone rubbers and fireproof strips, which differ from Example 1 in that the type and average particle size of the silane coupling agent modified aluminum nitride B are different, as shown in Table 4. All other aspects are the same as in Example 1.

[0133] Table 4 Examples 20-22 Examples 20-22 provide different ceramicized silicone rubbers and fireproof strips, which differ from Example 1 in the type and average particle size of aluminum hydroxide, as shown in Table 5. All other aspects are the same as in Example 1.

[0134] Table 5 Examples 23-24 Examples 23-24 provide different ceramicized silicone rubber and fireproof strips, which differ from Example 1 in that the type and average particle size of the glass powder are different, as shown in Table 6. All other aspects are the same as in Example 1.

[0135] Table 6 Examples 25-28 Examples 25-28 provide different ceramicized silicone rubbers and fireproof strips, which differ from Example 1 in that the type and average particle size of manganese dioxide are different, as shown in Table 7. All other aspects are the same as in Example 1.

[0136] Table 7 Examples 29-32 Examples 29-32 provide different ceramicized silicone rubbers and fireproof strips, which differ from Example 1 in that the type of silicone rubber and Mooney viscosity are different, as shown in Table 8. All other aspects are the same as in Example 1.

[0137] Table 8 Example 33 This embodiment provides a ceramicized silicone rubber and a fireproof strip, which differs from Embodiment 1 in that the type and amount of raw materials used in the ceramicized silicone rubber are different. All other aspects are the same as in Embodiment 1, as detailed below: The ceramicized silicone rubber comprises the following components in parts by weight: 100 parts silicone rubber-2, 180 parts composite filler, 40 parts silica, 20 parts zinc borate, 2 parts crosslinking agent, 5 parts hydroxyl silicone oil.

[0138] Example 34 This embodiment provides a ceramicized silicone rubber and a fireproof strip, which differs from Embodiment 1 in that the type and amount of raw materials used in the ceramicized silicone rubber are different. All other aspects are the same as in Embodiment 1, as detailed below: The ceramicized silicone rubber comprises the following components in parts by weight: 100 parts of silicone rubber - 3, 90 parts of composite filler, 10 parts of silica white, 5 parts of zinc borate, 0.5 parts of crosslinking agent, 2 parts of hydroxyl silicone oil.

[0139] Performance testing The following performance tests were carried out on the fireproof belts of each example and comparative example: 1. Thermal conductivity (thermal conductivity coefficient) test: The test was carried out in accordance with the standard of GB / T 42919.4 - 2023 "Plastics - Determination of thermal conductivity and thermal diffusivity - Part 4: Laser flash method", and the thermal conductivity coefficient of the fireproof belt was calculated by combining the standard specified formula; The qualified standard is that the thermal conductivity coefficient ≥ 1.15 W / m·K; The larger the thermal conductivity coefficient, the better the thermal conductivity performance of the fireproof belt; 2. Flame retardant performance (oxygen index) test: The fireproof belt was cut into strip specimens of 80 mm × 10 mm × 0.5 mm, and the oxygen index test was carried out according to the standard of GB / T2406.2 - 2009 "Plastics - Determination of combustion behavior by oxygen index method - Part 2: Room temperature test"; The qualified standard is that the oxygen index ≥ 32.0%; The larger the oxygen index, the better the flame retardant performance of the fireproof belt; The experimental results are shown in the following table: Table 9 Performance test results of fireproof belts of each example and comparative example As can be seen from Table 9, the ceramizable silicone rubber of the present invention has high thermal conductivity and flame retardant performance.

[0140] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A ceramicized silicone rubber, characterized in that, The components include the following parts by weight: 100 parts silicone rubber, 90-180 parts composite filler, 10-40 parts silica, 5-20 parts zinc borate, 0.5-2 parts crosslinking agent, 2-5 parts hydroxyl silicone oil; The ceramicized silicone rubber comprises silane coupling agent modified aluminum nitride, aluminum hydroxide, glass powder, and manganese dioxide in a weight ratio of 1:(1.2-3.0):(0.6-2.0):(0.10-0.27).

2. The ceramicized silicone rubber as described in claim 1, characterized in that, Includes at least one of the following (1)-(5): (1) The silane coupling agent modified aluminum nitride comprises silane coupling agent modified aluminum nitride A and silane coupling agent modified aluminum nitride B in a weight ratio of 1:(0.5-2), wherein the average particle size of silane coupling agent modified aluminum nitride A is 0.5-7 μm and the average particle size of silane coupling agent modified aluminum nitride B is 15-55 μm; (2) The average particle size of the aluminum hydroxide is 1-20 μm; (3) The average particle size of the glass powder is ≤20μm; (4) The average particle size of the manganese dioxide is (0.1-4) μm; (5) The Mooney viscosity of the silicone rubber is 30-65 ML(1+4)100℃.

3. The ceramicized silicone rubber as described in claim 2, characterized in that, Includes at least one of the following (1)-(7): (1) The weight ratio of the silane coupling agent modified aluminum nitride A and the silane coupling agent modified aluminum nitride B is 1:(1-1.5); (2) The average particle size of the silane coupling agent modified aluminum nitride A is (2-4) μm; (3) The average particle size of the silane coupling agent modified aluminum nitride B is (25-45) μm; (4) The average particle size of the aluminum hydroxide is 8-15 μm; (5) The average particle size of the glass powder is (3-12) μm; (6) The average particle size of the manganese dioxide is (0.5-3) μm; (7) The Mooney viscosity of the silicone rubber is 35-60 ML(1+4)100℃.

4. The ceramicized silicone rubber as described in claim 1, characterized in that, The method for preparing the silane coupling agent modified aluminum nitride is as follows: aluminum nitride and silane coupling agent are added to a solvent and subjected to heat treatment to obtain silane coupling agent modified aluminum nitride.

5. The ceramicized silicone rubber as described in claim 4, characterized in that, Includes at least one of the following (1)-(3): (1) The silane coupling agent includes at least one of 3-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, and 3-ureapropyltriethoxysilane; (2) The weight ratio of the aluminum nitride to the silane coupling agent is 100:(0.7-1.8); (3) The temperature of the heat treatment is 60-80℃.

6. The ceramicized silicone rubber as described in claim 1, characterized in that, Includes at least one of the following (1)-(4): (1) The silica is fumed silica and / or precipitated silica; (2) The mesh size of the silica is 1000-5000 mesh; (3) The crosslinking agent is a peroxide vulcanizing agent; (4) The silicone rubber includes methyl vinyl silicone rubber and / or methyl phenyl vinyl silicone rubber.

7. A method for preparing ceramicized silicone rubber as described in any one of claims 1-6, characterized in that, Includes the following steps: Mix the components, melt and extrude to obtain ceramicized silicone rubber.

8. The application of the ceramicized silicone rubber as described in any one of claims 1-6 in fire-retardant materials.

9. A fireproof belt, characterized in that, Includes the ceramicized silicone rubber as described in any one of claims 1-6.

10. A method for preparing the fireproof belt as described in claim 9, characterized in that, Includes the following steps: The fireproof belt is obtained by extruding ceramicized silicone rubber into a strip and then vulcanizing it.

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