CN114213850B - High-heat-conductivity silicone rubber cable material and preparation method and application thereof - Google Patents
High-heat-conductivity silicone rubber cable material and preparation method and application thereof Download PDFInfo
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Abstract
The invention provides a high-heat-conductivity silicone rubber cable material and a preparation method and application thereof, wherein the high-heat-conductivity silicone rubber cable material comprises the combination of specific parts of silicone rubber, a flame retardant, polydopamine modified graphene, boron nitride, silicone master batch and a silane coupling agent, and the high-heat-conductivity silicone rubber cable material is prepared by selecting the combination of the specific parts of boron nitride and polydopamine modified graphene as a heat-conducting filler, and the combination of the specific parts of boron nitride and polydopamine modified graphene is matched in a silicone rubber matrix to form a complete heat-conducting network, so that the obtained cable material has excellent heat-conducting property; meanwhile, a specific part of flame retardant and silane coupling agent are added, so that the flame retardant property and mechanical property of the cable material are effectively improved, and finally the high-heat-conductivity silicone rubber cable material meeting the dual standards of IEC62930 and UL4703 is obtained.
Description
Technical Field
The invention belongs to the technical field of cable materials, and particularly relates to a high-heat-conductivity silicone rubber cable material, and a preparation method and application thereof.
Background
In recent years, with the development of society, the application fields of wires and cables are gradually widened, and meanwhile, the requirements on flame retardance, mechanical property, electrical property and environmental protection of the wires and cables are gradually improved. As a substitute for halogen-containing flame-retardant cable materials, the low-smoke halogen-free cable materials have wider application and are more environment-friendly, but the flame-retardant performance and the mechanical performance of the low-smoke halogen-free cable materials face greater challenges. In the use of a general low-smoke halogen-free polyolefin cable material, the wire and the cable cannot be used at a higher temperature due to the lower melting point of polyolefin, so that potential safety hazards are easily caused.
CN106519398A discloses a formula of an ultraviolet-resistant and radiation-resistant polyethylene cable material, which comprises the following raw materials in parts by weight: 40-50 parts of polyethylene, 8-15 parts of polypropylene, 5-10 parts of DOP material, 2-3 parts of sodium stearate, 5-6 parts of zeolite, 4-8 parts of fumed silica, 2-5 parts of chlorinated paraffin, 1-5 parts of ultraviolet absorbent, 1-4 parts of conductive fiber, 2-6 parts of coupling agent, 2-4 parts of carbon fiber, 1-3 parts of nano barium sulfate, 3-8 parts of POE elastomer toughening agent, 3-6 parts of antioxidant, 2-4 parts of gamma ray absorbent, 5-8 parts of flame retardant and 8-15 parts of filler. The cable material takes polyethylene as a main material and is matched with other auxiliary materials and filling materials, the components do not contain lead, the cable material is safe and environment-friendly, and the magnetic resistance, the waterproof performance, the high temperature resistance and the chemical corrosion resistance are obviously improved compared with the common cable material; meanwhile, the cable material has excellent ultraviolet resistance, radiation resistance, flame retardance and antistatic property, is not easy to generate halogen-containing toxic substances and smoke dust during combustion, but the halogen-containing cable material has poor stability, is easy to age and change in performance under external conditions, and affects the insulation resistance of a system; the polyolefin has good chemical stability and acid and alkali corrosion resistance.
CN111560144a discloses a low-smoke halogen-free polyolefin cable material and a preparation method thereof, wherein the low-smoke halogen-free polyolefin cable material comprises the following formula components in parts by weight: 40-65 parts of polyethylene butyl acrylate, 8-15 parts of maleic anhydride grafted polyethylene, 160-200 parts of flame retardant, 8-10 parts of silicone rubber, 5-10 parts of nano zirconium dioxide, 5-15 parts of zinc borate, 2-5 parts of silicone master batch, 2-5 parts of silane coupling agent, 1-3 parts of 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 10-20 parts of metallocene polyethylene, 5-15 parts of ethylene-octene copolymer and 1-3 parts of antioxidant. CN102408623a discloses a low smoke halogen-free polyolefin cable material and a preparation method thereof, which mainly comprises the steps of mixing ethylene-vinyl acetate copolymer EVA, high density polyethylene HDPE, PE flame retardant, zinc borate, calcined zeolite powder, nano calcium carbonate powder, silane coupling agent, attapulgite, titanate, antioxidant, lubricant and cross-linking agent according to a certain weight portion ratio to prepare the low smoke halogen-free polyolefin cable material. The preparation method is simple, the operation is convenient, the formula of the composition raw materials is reasonable, and the prepared cable material has the advantages of high mechanical property, high temperature resistance, high flame retardant property, low smoke and no toxicity during combustion.
Although the cable materials with excellent performance are obtained by the materials, the cable materials still can not meet the dual standard IEC standard conforming to IEC62930 and UL4703, and the heat conduction performance of the prepared cable materials still needs to be improved.
Therefore, developing a high thermal conductivity silicone rubber cable material with excellent thermal stability and higher heat resistance grade is a technical problem that needs to be solved in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a high-heat-conductivity silicon rubber cable material, a preparation method and application thereof, wherein the high-heat-conductivity silicon rubber cable material is prepared by selecting silicon rubber as a matrix and matching with a specific part of boron nitride and polydopamine modified graphene, so that the obtained cable material is excellent in heat stability and higher in heat resistance grade.
To achieve the purpose, the invention adopts the following technical scheme:
the invention provides a high-heat-conductivity silicon rubber cable material, which is characterized by comprising the following components in parts by weight:
wherein the silicone rubber may be 12 parts by weight, 14 parts by weight, 16 parts by weight, 18 parts by weight, 20 parts by weight, 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight, or the like.
The flame retardant may be 42 parts by weight, 44 parts by weight, 46 parts by weight, 48 parts by weight, 50 parts by weight, 52 parts by weight, 54 parts by weight, 56 parts by weight, 58 parts by weight, or the like.
The polydopamine modified graphene may be 1.2 parts by weight, 1.4 parts by weight, 1.6 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.2 parts by weight, 2.4 parts by weight, 2.6 parts by weight, 2.8 parts by weight, or the like.
The boron nitride may be 1.2 parts by weight, 1.4 parts by weight, 1.6 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.2 parts by weight, 2.4 parts by weight, 2.6 parts by weight, 2.8 parts by weight, or the like.
The silicone masterbatch may be 1.2 parts by weight, 1.4 parts by weight, 1.6 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.2 parts by weight, 2.4 parts by weight, 2.6 parts by weight, 2.8 parts by weight, or the like.
The high-heat-conductivity silicone rubber cable material provided by the invention comprises the combination of silicone rubber, flame retardant, polydopamine modified graphene, boron nitride, silicone master batch and silane coupling agent in a specific part; firstly, silicon rubber is used as a main base material, the silicon rubber has good high and low temperature resistance, can work at a temperature of between 40 ℃ below zero and 200 ℃, has excellent electrical insulation performance and strong hydrophobicity, can be used under high pressure conditions, and can resist ozone and ultraviolet rays; meanwhile, in order to enhance the heat conductivity, a specific part of polydopamine modified graphene is adopted to be matched with boron nitride as a filler, and the graphene and the boron nitride have good heat conductivity, so that the heat dissipation function of the polydopamine modified graphene can be greatly enhanced by filling the polydopamine modified graphene in the silicon rubber, the damage of high heat to the cable is reduced, the dispersion and the compatibility of the polydopamine modified graphene in the silicon rubber are facilitated, a heat conduction network can be better formed by matching with the boron nitride, and the heat conduction performance of the cable material is further improved; and finally, adding a specific part of flame retardant, silicone master batch and silane coupling agent, further perfecting the flame retardant property and mechanical property of the cable material, and obtaining the high-heat-conductivity silicone rubber cable material with excellent comprehensive performance.
The high heat conduction in the high heat conduction silicone rubber cable material provided by the invention means that the heat conduction coefficient of the silicone rubber cable material is not lower than 1.8W/(m.K).
Preferably, the flame retardant comprises a combination of aluminum hydroxide and magnesium hydroxide.
As a preferred technical scheme of the invention, the combination of aluminum hydroxide and magnesium hydroxide is used as a flame retardant to help further improve the flame retardant property of the high-heat-conductivity silicone rubber cable material.
Preferably, the mass ratio of the aluminum hydroxide to the magnesium hydroxide is 1 (0.5-1), such as 1:0.55, 1:0.6, 1:0.65, 1:0.7, 1:0.75, 1:0.8, 1:0.85, 1:0.9 or 1:0.95, etc.
Preferably, the particle size of the aluminum hydroxide is 0.6 to 1. Mu.m, for example, 0.65. Mu.m, 0.7. Mu.m, 0.75. Mu.m, 0.8. Mu.m, 0.85. Mu.m, 0.9. Mu.m, 0.95. Mu.m, etc.
Preferably, the magnesium hydroxide has a particle size of 1.2 to 1.6 μm, for example 1.25 μm, 1.3 μm, 1.35 μm, 1.4 μm, 1.45 μm, 1.5 μm or 1.55 μm, etc.
Preferably, the silicone rubber is methyl vinyl silicone rubber.
Preferably, the polydopamine modified graphene is prepared by mixing graphene and dopamine.
Preferably, the mixing time is 1 to 4 hours, such as 1.5 hours, 2 hours, 2.5 hours, 3 hours, 3.5 hours, 4 hours, etc.
Preferably, the high heat conduction silicone rubber cable material further comprises a compatilizer and/or a stabilizer.
Preferably, the compatibilizer comprises any one or a combination of at least two of a maleic anhydride grafted ethylene-octene copolymer, a maleic anhydride grafted ethylene-vinyl acetate copolymer, or a maleic anhydride grafted metallocene linear low density polyethylene.
Preferably, the content of the compatibilizer in the high thermal conductive silicone rubber cable material is 1 to 3 parts by weight, for example, 1.2 parts by weight, 1.4 parts by weight, 1.6 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.2 parts by weight, 2.4 parts by weight, 2.6 parts by weight, or 2.8 parts by weight, etc.
Preferably, the stabilizer comprises any one or a combination of at least two of calcium stearate, zinc stearate or tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] pentaerythritol ester.
Preferably, the content of the stabilizer in the high thermal conductive silicone rubber cable material is 1 to 3 parts by weight, for example, 1.2 parts by weight, 1.4 parts by weight, 1.6 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.2 parts by weight, 2.4 parts by weight, 2.6 parts by weight, or 2.8 parts by weight, etc.
Preferably, the high-heat-conductivity silicone rubber cable material further comprises an antioxidant.
Preferably, the content of the antioxidant in the high thermal conductivity silicone rubber cable material is 1 to 3 parts by weight, for example, 1.2 parts by weight, 1.4 parts by weight, 1.6 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.2 parts by weight, 2.4 parts by weight, 2.6 parts by weight, or 2.8 parts by weight, etc.
In a second aspect, the present invention provides a method for preparing the high thermal conductivity silicone rubber cable material according to the first aspect, the method comprising the following steps:
(1) Mixing and extruding silicone rubber, a flame retardant, polydopamine modified graphene, a compatilizer, a stabilizer, silicone master batch, a silane coupling agent and optionally an antioxidant to obtain blended particles;
(2) And (3) preparing the blended particles obtained in the step (1) into wires, and then carrying out irradiation crosslinking on the wires to obtain the high-heat-conductivity silicone rubber cable material.
Preferably, the method of mixing in step (1) is banburying.
Preferably, the temperature of the banburying is 20 to 40 ℃, for example, 22 ℃, 24 ℃, 26 ℃, 28 ℃, 30 ℃, 32 ℃, 34 ℃, 36 ℃, 38 ℃, or the like.
Preferably, the mixing time in step (1) is 15 to 25 minutes, for example 16 minutes, 17 minutes, 18 minutes, 19 minutes, 20 minutes, 21 minutes, 22 minutes, 23 minutes or 24 minutes, etc.
Preferably, the extrusion method in step (1) is single screw extruder extrusion.
Preferably, the single screw extruder comprises a first zone, a second zone, a third zone, a fourth zone, a fifth zone, a sixth zone and a seventh zone which are connected in sequence;
preferably, the temperature of the first zone is 110 to 115 ℃ (e.g., 110.5 ℃, 111 ℃, 111.5 ℃, 112 ℃, 112.5 ℃, 113 ℃, 113.5 ℃, 114 ℃, 114.5 ℃, or 114.5 ℃, etc.), the temperature of the second zone is 115 to 120 ℃ (e.g., 115.5 ℃, 116 ℃, 116.5 ℃, 117 ℃, 117.5 ℃, 118 ℃, 118.5 ℃, 119 ℃, 119.5 ℃, or 119.5 ℃, etc.), the temperature of the third zone is 115 to 120 ℃ (e.g., 115.5 ℃, 116.5 ℃, 117 ℃, 117.5 ℃, 118 ℃, 118.5 ℃, 119 ℃, 119.5 ℃, etc.),etc.), the fourth zone has a temperature of 120 to 125 ℃ (e.g., 120.5 ℃, 121 ℃, 121.5 ℃, 122 ℃, 122.5 ℃, 123 ℃, 123.5 ℃, 124 ℃, 124.5 ℃, etc.), the fifth zone has a temperature of 120 to 125 ℃ (120.5 ℃, 121 ℃, 121.5 ℃, 122 ℃, 122.5 ℃, 123.5 ℃, 124 ℃, 124.5 ℃, etc.), the sixth zone has a temperature of 120 to 130 ℃ (e.g., 121 ℃, 122 ℃, 123 ℃, 124 ℃, 125 ℃, 126 ℃, 127 ℃, 128 ℃, 129 ℃, etc.), and the seventh zone has a temperature of 125 to 130 ℃ (e.g., 125.5 ℃, 126 ℃, 126.5 ℃, 127.5 ℃, 128 ℃, 128.5 ℃, 129 ℃, etc.).
Preferably, the forming of the wire in step (2) is performed by a wire extruder.
Preferably, the wire extruder comprises a zone A, a zone B, a zone C and a zone D which are connected in sequence.
Preferably, the temperature of the A region is 110 to 120 ℃ (e.g., 111 ℃, 112 ℃, 113 ℃, 114 ℃, 115 ℃, 116 ℃, 117 ℃, 118 ℃, 119 ℃ or the like), the temperature of the B region is 135 to 145 ℃ (e.g., 136 ℃, 137 ℃, 138 ℃, 139 ℃, 140 ℃, 141 ℃, 142 ℃, 143 ℃, 144 ℃, or the like), the temperature of the C region is 145 to 155 ℃ (e.g., 146 ℃, 147 ℃, 148 ℃, 149 ℃, 150 ℃, 151 ℃, 152 ℃, 153 ℃, 154 ℃, or the like), and the temperature of the D region is 150 to 160 ℃ (e.g., 151 ℃, 152 ℃, 153 ℃, 154 ℃, 155 ℃, 156 ℃, 157 ℃, 158 ℃, 159 ℃, or the like).
Compared with the prior art, the invention has the following beneficial effects:
(1) The high-heat-conductivity silicone rubber cable material provided by the invention comprises the combination of silicone rubber, flame retardant, polydopamine modified graphene, boron nitride, silicone master batch and silane coupling agent in a specific part; firstly, silicon rubber is used as a main base material, the silicon rubber has good high and low temperature resistance, can work at a temperature of between 40 ℃ below zero and 200 ℃, has excellent electrical insulation performance and strong hydrophobicity, can meet high-pressure use, and can resist ozone and ultraviolet rays; meanwhile, in order to enhance the heat conductivity, a specific part of polydopamine modified graphene is adopted to be matched with boron nitride as a filler, the graphene and the boron nitride are good in heat conductivity, the heat dissipation function of the polydopamine modified graphene can be greatly enhanced by being filled in the silicon rubber, the damage of high heat to the cable is reduced, and the polydopamine modified graphene is beneficial to the dispersion of the graphene in the silicon rubber, and a heat conduction network can be better formed by being matched with the boron nitride, so that the heat conductivity of the cable material is further improved; finally, the flame retardant, the silicone master batch and the silane coupling agent with specific parts are matched, so that the flame retardant property and the mechanical property of the cable material are further improved, and the high-heat-conductivity silicone rubber cable material with excellent comprehensive properties is obtained.
(2) Specifically, the high-heat-conductivity silicone rubber cable material provided by the invention has the tensile strength of 9.4-9.8 MPa, the elongation at break of 323-341%, and the heat conductivity coefficient of 1.9-2.5W/(m.K), and single vertical combustion can be realized.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
The reagents or materials used in the following examples were all available from conventional manufacturers, and the specific manufacturers and models are shown in Table 1:
TABLE 1
| Name of the name | Manufacturer(s) | Model number |
| Methyl vinyl silicone rubber | Red leaf | HY-E620 |
| Silane coupling agent | Jinan Ruijntai chemical Co.Ltd | KH550 |
| Compatibilizing agent | New material family of Nanjing FeitengTechnology Co Ltd | / |
| Stabilizer | Hangzhou Jusheng Cable Material Co Ltd | W3105 |
| Silicone master batch | Zhejiang Jiahua Co., ltd | GT500 |
| Antioxidant | Hangzhou Jusheng Cable Material Co Ltd | W3071 |
Example 1
The high-heat-conductivity silicone rubber cable material comprises the following components in parts by weight:
the preparation method comprises the following steps:
(1) Mixing methyl vinyl silicone rubber, magnesium hydroxide, aluminum hydroxide and polydopamine modified graphene (wherein the mass ratio of dopamine to graphene is 1:1 in deionized water at 50 ℃ for 2 hours to obtain polydopamine modified graphene), boron nitride, a compatilizer, a stabilizer, silicone master batch, a silane coupling agent and an antioxidant, mixing at 160 ℃ for 25 minutes, and preparing into particles by a single screw extruder, wherein the single screw extruder comprises a first zone, a second zone, a third zone, a fourth zone, a fifth zone, a sixth zone and a seventh zone which are sequentially connected, the materials sequentially pass through the zones, the working temperature of the first zone is 110 ℃, the working temperature of the second zone is 115 ℃, the working temperature of the third zone is 115 ℃, the working temperature of the fourth zone is 120 ℃, the working temperature of the fifth zone is 120 ℃, the working temperature of the sixth zone is 120 ℃, and the working temperature of the seventh zone is 125 ℃, so as to obtain the blended particles;
(2) Adding the blended particles obtained in the step (1) into a wire extruder, wherein the wire extruder comprises an area A, an area B, an area C and an area D which are sequentially connected, the particles sequentially pass through the areas, the working temperature of the area A is set to be 110 ℃, the working temperature of the area B is set to be 135 ℃, the working temperature of the area C is set to be 145 ℃, the working temperature of the area D is set to be 150 ℃, and after the wires are obtained, the irradiation crosslinking is carried out by using an electron accelerator, and the irradiation dose is 9Mrad, so that the high-heat-conductivity silicone rubber cable material is obtained.
Example 2
The high-heat-conductivity silicone rubber cable material comprises the following components in parts by weight:
the high-heat-conductivity silicone rubber cable material provided in this embodiment is the same as the preparation method of the high-heat-conductivity silicone rubber cable material provided in embodiment 1.
Example 3
The high-heat-conductivity silicone rubber cable material comprises the following components in parts by weight:
the high-heat-conductivity silicone rubber cable material provided in this embodiment is the same as the preparation method of the high-heat-conductivity silicone rubber cable material provided in embodiment 1.
Example 4
A high heat conduction silicone rubber cable material is different from example 1 in that magnesium hydroxide is not added, the addition amount of aluminum hydroxide is 50 parts by weight, and other components, amounts and preparation methods are the same as in example 1.
Example 5
A high heat conduction silicone rubber cable material is different from example 1 in that no aluminum hydroxide is added, the addition amount of magnesium hydroxide is 50 parts by weight, and other components, amounts and preparation methods are the same as in example 1.
Comparative example 1
The silicone rubber cable material is different from the example 1 in that graphene is adopted to replace polydopamine modified graphene, and other components, the dosage and the preparation method are the same as those of the example 1.
Comparative example 2
The silicone rubber cable material is different from the silicone rubber cable material in that polydopamine modified carbon black (the polydopamine modified graphene is obtained by mixing dopamine and carbon black in a mass ratio of 1:1 in deionized water at 50 ℃ for 2 hours) is adopted to replace polydopamine modified graphene, and other components, the use amounts and the preparation method are the same as those of the silicone rubber cable material in the example 1.
Comparative example 3
A silicone rubber cable material is different from example 1 in that polydopamine modified graphene is not added, the added amount of boron nitride is 4 parts by weight, and other components, the used amount and the preparation method are the same as those of example 1.
Comparative example 4
The silicone rubber cable material is different from example 1 in that boron nitride is not added, the added amount of polydopamine modified graphene is 4 parts by weight, and other components, the used amount and the preparation method are the same as those of example 1.
Comparative example 5
A silicone rubber cable material differs from example 1 in that no silane coupling agent is added, and other components, amounts and preparation methods are the same as in example 1.
Performance test:
(1) Single vertical combustion: testing according to GB/T18380-2008 'combustion test under flame conditions of electric cables and optical cables';
(2) Tensile strength, elongation at break: testing according to the testing method of tensile strength and elongation at break in GB/T2951 general testing method for cable and optical cable insulation and sheath materials;
(3) Thermal conductivity: and testing by adopting a heat conduction tester.
The silicone rubber cable materials provided in examples 1 to 5 and comparative examples 1 to 4 were tested according to the above test methods, and the test results are shown in table 2:
TABLE 2
From the data in table 2, it can be seen that: the high-heat-conductivity silicone rubber cable material provided by the invention has excellent flame retardant property, heat-conducting property and mechanical property; specifically, the high thermal conductivity silicone rubber cable materials obtained in examples 1 to 5 have tensile strength of 9.4 to 9.8MPa, elongation at break of 323 to 341%, and thermal conductivity of 1.9 to 2.5W/(m.K), and the single vertical combustion can pass.
As can be seen from comparative example 1 and comparative example 1, the mechanical properties and the thermal conductivity of the cable material obtained by replacing polydopamine-modified graphene with graphene are reduced, because graphene is not modified and is easily agglomerated, and the compatibility of silicone rubber is poor.
As can be seen from comparative examples 1 and 2, the thermal conductivity of the cable material obtained by replacing the polydopamine modified graphene with polydopamine modified carbon black is also reduced, because polydopamine modified carbon black is difficult to cooperate with boron nitride to form an effective thermal conductive network.
As can be seen from comparative examples 1 and comparative examples 3 to 4, the thermal conductivity of the cable material obtained without adding boron nitride and without adding dopamine-modified graphene is greatly reduced, which indicates that it is difficult to effectively improve the thermal conductivity of the cable material by adding only one thermal conductive filler.
As can be seen from comparative examples 1 and 5, the mechanical properties, heat conductive properties, and flame retardant properties of the cable material obtained without adding the silane coupling agent are all reduced due to the difficulty in effectively dispersing the filler in the silicone rubber matrix.
The applicant states that the present invention is described by way of the above examples as a high thermal conductivity silicone rubber cable material and methods of making and using the same, but the present invention is not limited to, i.e., does not mean that the present invention must be practiced in dependence upon, the above examples. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of raw materials for the product of the present invention, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present invention and the scope of disclosure.
Claims (17)
1. The high-heat-conductivity silicone rubber cable material with the heat conductivity coefficient not lower than 1.8W/(m.K) is characterized by comprising the following components in parts by weight:
the flame retardant comprises aluminum hydroxide and magnesium hydroxide with the mass ratio of (0.5-1);
the polydopamine modified graphene is prepared by mixing graphene and dopamine;
the stabilizer comprises any one or a combination of at least two of calcium stearate, zinc stearate or tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] pentaerythritol ester.
2. The high thermal conductivity silicone rubber cable material according to claim 1, wherein the particle size of the aluminum hydroxide is 0.6-1 μm.
3. The high thermal conductivity silicone rubber cable material of claim 1 wherein the magnesium hydroxide has a particle size of 1.2 to 1.6 μm.
4. The high thermal conductivity silicone rubber cable material of claim 1 wherein the silicone rubber is methyl vinyl silicone rubber.
5. The high thermal conductivity silicone rubber cable material of claim 1 wherein the mixing time is 1 to 4 hours.
6. The high thermal conductivity silicone rubber cable material of claim 1, wherein the compatibilizer comprises any one or a combination of at least two of a maleic anhydride grafted ethylene-octene copolymer, a maleic anhydride grafted ethylene-vinyl acetate copolymer, or a maleic anhydride grafted metallocene linear low density polyethylene.
7. A method for preparing the high thermal conductivity silicone rubber cable material according to any one of claims 1 to 6, comprising the steps of:
(1) Mixing and extruding silicone rubber, a flame retardant, polydopamine modified graphene, boron nitride, a compatilizer, a stabilizer, silicone master batch, a silane coupling agent and an antioxidant to obtain blended particles;
(2) And (3) preparing the blended particles obtained in the step (1) into wires, and then carrying out irradiation crosslinking on the wires to obtain the high-heat-conductivity silicone rubber cable material.
8. The method according to claim 7, wherein the method of kneading in the step (1) is banburying.
9. The method according to claim 8, wherein the internal mixing is carried out at a temperature of 20 to 40 ℃.
10. The method according to claim 7, wherein the kneading time in the step (1) is 15 to 25 minutes.
11. The method of claim 7, wherein the extrusion in step (1) is a single screw extruder.
12. The method of claim 11, wherein the single screw extruder comprises a first zone, a second zone, a third zone, a fourth zone, a fifth zone, a sixth zone, and a seventh zone, connected in sequence.
13. The process of claim 12 wherein the first zone is at a temperature of 110 to 115 ℃, the second zone is at a temperature of 115 to 120 ℃, the third zone is at a temperature of 115 to 120 ℃, the fourth zone is at a temperature of 120 to 125 ℃, the fifth zone is at a temperature of 120 to 125 ℃, the sixth zone is at a temperature of 120 to 130 ℃, and the seventh zone is at a temperature of 125 to 130 ℃.
14. The method of claim 7, wherein the forming of the wire in step (2) is performed by a wire extruder.
15. The method of claim 14, wherein the wire extruder comprises a zone a, a zone B, a zone C, and a zone D connected in sequence.
16. The process of claim 15 wherein the temperature in zone a is 110 to 120 ℃, zone B is 135 to 145 ℃, zone C is 145 to 155 ℃, and zone D is 150 to 160 ℃.
17. Use of the high thermal conductivity silicone rubber cable material according to any one of claims 1-6 in a photovoltaic power generation system.
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