High-temperature-resistant power cable and preparation method thereof

Abstract

According to the high-temperature-resistant power cable and the preparation method thereof, the high-temperature-resistant power cable comprises at least one conductor core and an insulating layer wrapping the surface of the conductor core, the insulating layer comprises silicone rubber and a carbon-ceramic composite material, and the weight ratio of the silicone rubber to the carbon-ceramic composite material is (10-60): 1. According to the technical scheme, through reasonable compatibility of the silicone rubber and the carbon-ceramic composite material in the insulating layer, and the weight ratio of the silicone rubber to the carbon-ceramic composite material is set within the range of (10-60): 1, the high temperature resistance of the power cable can be greatly improved.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to a high temperature resistant power cable and a preparation method thereof. Background Art

[0002] Power cable is a cable used to transmit and distribute electrical energy. It is usually used in underground power grids, power station lead-out lines, internal power supply for industrial and mining enterprises, and underwater transmission lines across rivers and seas. With the rapid development of power systems, the performance requirements for cables are getting higher and higher.

[0003] However, in the related art, the high temperature resistance of the power cable is far from meeting the requirements. Therefore, it is urgent to develop a high temperature resistant power cable and a preparation method thereof. Summary of the invention

[0004] The present application provides a high temperature resistant power cable and a preparation method thereof. The high temperature resistant power cable has good high temperature resistance.

[0005] In a first aspect, the present application provides a high temperature resistant power cable, comprising at least one conductor core and an insulating layer coated on the surface of the conductor core, wherein the insulating layer comprises silicone rubber and a carbon-ceramic composite material, wherein the weight ratio of the silicone rubber to the carbon-ceramic composite material is (10~60):1.

[0006] According to any of the foregoing embodiments of the first aspect of the present application, the insulating layer comprises the following components in parts by weight: Silicone rubber, 100 parts by weight; The carbon-ceramic composite material has a content of 2 to 10 parts by weight of the carbon-ceramic composite material in the insulating layer based on 100 parts by weight of the silicone rubber.

[0007] According to any of the aforementioned embodiments of the first aspect of the present application, the insulating layer further comprises the following components in parts by weight: The carbon-ceramic composite material has a content of 4 to 8 parts by weight in the insulating layer based on 100 parts by weight of the silicone rubber.

[0008] According to any of the aforementioned embodiments of the first aspect of the present application, the carbon-ceramic composite material includes carbon fibers and a metal oxide ceramic material loaded on the carbon fibers, and the mass content A of the metal oxide ceramic material in the carbon-ceramic composite material and the mass content B of the carbon fibers in the carbon-ceramic composite material satisfy 9≤A / B.

[0009] According to any of the aforementioned embodiments of the first aspect of the present application, the mass content A of the metal oxide ceramic material in the carbon-ceramic composite material is 90%≤A≤98%.

[0010] According to any of the aforementioned embodiments of the first aspect of the present application, the metal oxide ceramic material includes at least one of zinc oxide nanoparticles, titanium oxide nanoparticles and magnesium oxide nanoparticles.

[0011] According to any of the aforementioned embodiments of the first aspect of the present application, the aspect ratio of the carbon fiber is (50-200):1.

[0012] According to any of the aforementioned embodiments of the first aspect of the present application, the weight average molecular weight of the silicone rubber is 300,000 to 600,000.

[0013] According to any of the aforementioned embodiments of the first aspect of the present application, the insulating layer further comprises the following components in parts by weight: The toughening elastomer has a content of 10 to 20 parts by weight in the insulating layer based on 100 parts by weight of the silicone rubber.

[0014] According to any of the aforementioned embodiments of the first aspect of the present application, the high temperature resistant power cable further includes: A first shielding layer, disposed between the conductor core and the insulating layer; A second shielding layer, covering a surface of the insulating layer away from the first shielding layer; The protective layer covers the surface of the second shielding layer away from the second shielding layer.

[0015] In a second aspect, the present application provides a method for preparing a high temperature resistant power cable as described in any embodiment of the first aspect of the present application, comprising: Mixing raw materials including silicone rubber and carbon-ceramic composite material to obtain an insulating layer material; The insulating layer material is wrapped on the outside of the conductor core by co-extrusion, and an insulating layer is formed on the surface of the conductor core after cooling and crystallization, thereby obtaining a high-temperature resistant power cable.

[0016] The present invention provides a high temperature resistant power cable and a preparation method thereof, wherein the high temperature resistant power cable comprises at least one conductor core and an insulating layer coated on the surface of the conductor core, wherein the insulating layer comprises a silicone rubber and a carbon-ceramic composite material, wherein the weight ratio of the silicone rubber and the carbon-ceramic composite material is (10-60):1. In the above technical solution, the high temperature resistance of the cable can be greatly improved by reasonably matching the silicone rubber and the carbon-ceramic composite material in the insulating layer and setting the weight ratio of the silicone rubber and the carbon-ceramic composite material in the range of (10-60):1.

[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. DETAILED DESCRIPTION

[0018] "Scope" disclosed in the present application is limited in the form of lower limit and upper limit, and a given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a special range. The scope limited in this way can be including end values ​​or not including end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a scope. For example, if the scope of 60-120 and 80-110 is listed for a specific parameter, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following scope can be all expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In the present application, unless otherwise specified, the numerical range "ab" represents the abbreviation of any real number combination between a and b, wherein a and b are real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0019] If not otherwise specified, all embodiments and optional embodiments of the present application may be combined with each other to form new technical solutions, and such technical solutions should be deemed to be included in the disclosure of the present application.

[0020] Unless otherwise specified, all technical features and optional technical features of the present application may be combined with each other to form a new technical solution, and such a technical solution should be deemed to be included in the disclosure of the present application.

[0021] Unless otherwise specified, all steps of the present application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may also include step (c), which means that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0022] If there is no special explanation, the "include" and "comprising" mentioned in this application are open-ended or closed-ended. For example, the "include" and "comprising" may mean that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0023] If not specifically stated, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0024] Unless otherwise specified, the terms used in this application have the commonly understood meanings that are commonly understood by those skilled in the art.

[0025] Unless otherwise specified, the values ​​of the parameters mentioned in the present application can be measured by various test methods commonly used in the art, for example, they can be measured according to the test methods given in the embodiments of the present application.

[0026] In a first aspect, the present application provides a high temperature resistant power cable, which includes a conductor core and an insulating layer coated on the surface of the conductor core, the insulating layer includes silicone rubber and carbon-ceramic composite materials, wherein the weight ratio of silicone rubber to carbon-ceramic composite materials is (10~60):1.

[0027] The present invention provides a high temperature resistant power cable and a preparation method thereof, wherein the high temperature resistant power cable comprises a conductor core and an insulating layer coated on the surface of the conductor core, wherein the insulating layer comprises a silicone rubber and a carbon ceramic composite material, wherein the weight ratio of the silicone rubber and the carbon ceramic composite material is (10-60):1. In the above technical scheme, the high temperature resistance of the cable can be greatly improved by reasonably matching the silicone rubber and the carbon ceramic composite material in the insulating layer and setting the weight ratio of the silicone rubber and the carbon ceramic composite material in the range of (10-60):1.

[0028] In the embodiment of the present application, the conductive core is used for conducting electricity so that the cable transmits signals. The conductive core can be selected from suitable materials and sizes according to actual application requirements. For example, the material of the conductive core can include conductive metal material, and its outer diameter can be 20mm~100mm.

[0029] Exemplarily, when the present application provides a high temperature resistant power cable for use in underwater transmission lines across rivers and seas, the material of the conductive core includes aluminum, and the outer diameter of the cable can be 80 mm.

[0030] In addition, the high temperature resistant power cable provided in the present application can also be provided with corresponding conductive cores according to actual application requirements. In some embodiments, the high temperature resistant power cable can include 2 conductive cores, 3 conductive cores or 4 conductive cores.

[0031] The insulating layer coated on the surface of the conductive core can electrically isolate the conductive core from the earth and different conductive cores from each other to ensure the transmission of electric energy. Moreover, the various properties of the power cable are also closely related to the insulating layer. The present application can improve the high temperature resistance of the cable by reasonably matching the components of the insulating layer and setting the weight ratio of silicone rubber and carbon ceramic composite material in the range of (10~60):1.

[0032] In some embodiments of the present application, the weight ratio of the silicone rubber to the carbon-ceramic composite material is (20-50): 1. When the weight ratio of the silicone rubber to the carbon-ceramic composite material is controlled within the above range, the high temperature resistance of the power cable can be improved, and the tensile strength and elongation at break of the power cable can also be improved.

[0033] For example, the weight ratio of the silicone rubber to the carbon ceramic composite material can be, but is not limited to, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, 21:1, 22:1, 23:1, 24:1, 25:1, 26:1, 27:1, 28:1, 29:1, 30:1, 31:1, 32:1, 33:1, 34:1, 35:1, 36:1, 37:1, 38:1, 39:1, 40:1, 41:1, 42:1, 43:1, 44:1, 45:1, 46:1, 47:1, 48:1, 49:1, 50:1, 51:1, 52:1, 53:1, 54:1, 55:1, 56:1, 57:1, 58:1, 59:1, 60:1, etc.

[0034] Furthermore, the weight percentages of the silicone rubber and carbon-ceramic composite material in the insulating layer are within a suitable range, which can further improve the mechanical properties and high temperature resistance of the power cable.

[0035] In some embodiments of the present application, the insulating layer includes the following components by weight: silicone rubber, 100 parts by weight; carbon-ceramic composite material, based on 100 parts by weight of silicone rubber, the content of the carbon-ceramic composite material in the insulating layer is 2 parts by weight to 10 parts by weight.

[0036] In some embodiments of the present application, the insulating layer further comprises the following components by weight: a carbon-ceramic composite material, wherein the content of the carbon-ceramic composite material in the insulating layer is 4 to 8 parts by weight based on 100 parts by weight of silicone rubber.

[0037] In the above embodiment, the carbon-ceramic composite material includes suitable materials to further improve the high temperature resistance and mechanical properties of the power cable.

[0038] In some embodiments of the present application, the carbon-ceramic composite material includes carbon fibers and a metal oxide ceramic material loaded on the carbon fibers, and the mass content A of the metal oxide ceramic material in the carbon-ceramic composite material and the mass content B of the carbon fibers in the carbon-ceramic composite material satisfy 9≤A / B. In the carbon-ceramic composite material, the mass content A of the metal oxide ceramic material in the carbon-ceramic composite material and the mass content B of the carbon fibers in the carbon-ceramic composite material satisfy the above relationship, which can not only improve the high temperature resistance of the power cable, but also improve the tensile strength and elongation at break of the power cable and the insulation performance of the insulation layer.

[0039] In the above embodiment, the carbon-ceramic composite material can be prepared using methods well known in the art, or can be purchased from the market, for example, from Beijing Tianyi Shangjia New Materials Co., Ltd.

[0040] In some embodiments of the present application, the mass content A of the metal oxide ceramic material in the carbon-ceramic composite material is 90%≤A≤98%.

[0041] In some examples, A may be, but is not limited to, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, etc., and B may be, but is not limited to, 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, etc.

[0042] In some embodiments of the present application, the metal oxide ceramic material includes at least one of zinc oxide nanoparticles, titanium oxide nanoparticles, and magnesium oxide nanoparticles.

[0043] In some embodiments of the present application, the aspect ratio of the carbon fiber is (50-200): 1. When the aspect ratio of the carbon fiber is controlled within the above range, the tensile strength and elongation at break of the power cable can be further improved.

[0044] Exemplarily, the aspect ratio of the carbon fiber can be, but is not limited to, 50:1, 55:1, 60:1, 65:1, 70:1, 75:1, 80:1, 85:1, 90:1, 95:1, 100:1, 105:1, 110:1, 115:1, 120:1, 125:1, 130:1, 135:1, 140:1, 145:1, 150:1, 155:1, 160:1, 165:1, 170:1, 175:1, 180:1, 185:1, 190:1, 195:1, 200:1, etc.

[0045] In some embodiments of the present application, the silicone rubber may include dimethyl silicone rubber and / or methyl vinyl silicone rubber.

[0046] In some embodiments of the present application, the weight average molecular weight of the silicone rubber is 300,000 to 500,000. Controlling the weight average molecular weight of the silicone rubber within the above range can further help improve the high temperature resistance, tensile strength, elongation at break and processing performance of the power cable.

[0047] Exemplarily, the weight average molecular weight of the silicone rubber can be, but is not limited to, 300,000, 310,000, 320,000, 330,000, 340,000, 350,000, 360,000, 370,000, 380,000, 390,000, 400,000, 410,000, 420,000, 430,000, 440,000, 450,000, 460,000, 470,000, 480,000, 490,000, 500,000, or a range consisting of any two values ​​between 300,000 and 500,000.

[0048] In some embodiments of the present application, the insulating layer further comprises the following components by weight: a toughening elastomer, with the content of the toughening elastomer in the insulating layer being 10 to 20 parts by weight based on 100 parts by weight of silicone rubber. The toughening elastomer can further improve the mechanical strength of the power cable.

[0049] In the above embodiment, the toughening elastomer may be an elastomer well known in the art, such as at least one of ethylene-octene copolymer elastomer, polyethylene, ethylene-propylene rubber, and styrene-ethylene-butylene-styrene block copolymer.

[0050] In some embodiments of the present application, the high temperature resistant power cable further comprises a first shielding layer, a second shielding layer, and a protective layer. The first shielding layer is disposed between the conductor core and the insulating layer; the second shielding layer is coated on the surface of the insulating layer away from the first shielding layer; and the protective layer is coated on the surface of the second shielding layer away from the second shielding layer. The first shielding layer and the second shielding layer can reduce interference between adjacent conductive cores, and the protective layer can protect the power cable from being infiltrated by external impurities and moisture.

[0051] In a second aspect, the present application provides a method for preparing a high temperature resistant power cable as described in any embodiment of the first aspect of the present application, comprising: Mixing raw materials including silicone rubber and carbon-ceramic composite material to obtain an insulating layer material; The insulating layer material is wrapped on the outside of the conductor core by co-extrusion, and an insulating layer is formed on the surface of the conductor core after cooling and crystallization, thereby obtaining a high-temperature resistant power cable.

[0052] The following embodiments describe the contents disclosed in the present application in more detail, and these embodiments are only used for illustrative explanations, because it is obvious to those skilled in the art that various modifications and changes are made within the scope of the present application disclosure. Unless otherwise stated, all parts, percentages and ratios reported in the following embodiments are based on mass, and all reagents used in the embodiments are commercially available or synthesized according to conventional methods, and can be used directly without further processing, and the instruments used in the embodiments are commercially available.

[0053] Example 1

[0054] 100 parts by weight of methyl vinyl silicone rubber (model SH-8160 of Suzhou Beiteli Polymer Materials Co., Ltd., with a weight average molecular weight of 300,000) and 2 parts by weight of a raw material of a carbon-ceramic composite material are blended at 200° C. to obtain an insulating layer material, wherein the carbon-ceramic composite material includes carbon fibers and zinc oxide ceramic particles supported on the carbon fibers, the carbon fibers have a length of 10 mm and an outer diameter of 50 μm, the mass content of the carbon fibers in the carbon-ceramic composite material is 10%, and the mass content of the zinc oxide ceramic particles in the carbon-ceramic composite material is 90%; 20 parts by weight of polypropylene, 10 parts by weight of ethylene-octene copolymer elastomer, and 15 parts of conductive carbon black are mixed at 190° C. to obtain a first shielding layer material; 20 parts by weight of polypropylene, 10 parts by weight of ethylene-octene copolymer elastomer, and 15 parts of conductive carbon black are blended at 190° C. to obtain a second shielding layer material; The second shielding layer material, the above-mentioned insulating layer material and the second shielding layer material are wrapped on the outside of the aluminum conductor by four-layer co-extrusion, cooled and crystallized to form the first shielding layer, the insulating layer and the second shielding layer to obtain a high temperature resistant power cable.

[0055] Example 2

[0056] The preparation method is similar to that of Example 1, except that: 4 parts by weight of carbon-ceramic composite material.

[0057] Example 3

[0058] The preparation method is similar to that of Example 1, except that: 6 parts by weight of carbon-ceramic composite material.

[0059] Example 4

[0060] The preparation method is similar to that of Example 1, except that: 8 parts by weight of carbon-ceramic composite material.

[0061] Example 5

[0062] The preparation method is similar to that of Example 1, except that: 10 parts by weight of carbon-ceramic composite material.

[0063] Example 6 The preparation method is similar to that of Example 1, except that: 120 parts by weight of methyl vinyl silicone rubber.

[0064] Example 7

[0065] The preparation method is similar to that of Example 1, except that the weight average molecular weight of the methyl vinyl silicone rubber is 400,000.

[0066] Example 8

[0067] The preparation method is similar to that of Example 1, except that the weight average molecular weight of the methyl vinyl silicone rubber is 500,000.

[0068] Example 9

[0069] The preparation method is similar to that of Example 1, except that the mass content of the carbon fiber in the carbon-ceramic composite material is 5%, and the mass content of the zinc oxide ceramic particles in the carbon-ceramic composite material is 95%.

[0070] Example 10

[0071] The preparation method is similar to that of Example 1, except that the mass content of the carbon fiber in the carbon-ceramic composite material is 2%, and the mass content of the zinc oxide ceramic particles in the carbon-ceramic composite material is 98%.

[0072] Embodiment 11

[0073] The preparation method is similar to that of Example 1, except that the length of the carbon fiber is 5 mm.

[0074] Example 12

[0075] The preparation method is similar to that of Example 1, except that the outer diameter of the carbon fiber is 200 μm.

[0076] Comparative Example 1 The preparation method of this comparative example is similar to that of Example 1, except that polypropylene is used to replace the methyl vinyl silicone rubber.

[0077] Comparative Example 2 The preparation method is similar to that of Example 1, except that silicon nitride is used to replace the carbon-ceramic composite material.

[0078] Performance test section The cables of the embodiments and comparative examples were subjected to the following performance tests.

[0079] (1) Tensile strength and elongation at break test At room temperature, the tensile strength and elongation at break were tested according to GB / T 2951.11-2008. The test results are shown in Table 1.

[0080] (2) High temperature resistance test The test sample was placed at 180°C and aged for 240 hours, and then tested according to GB / T 2951.11-2008 to obtain the tensile strength and elongation at break after aging. The test results are shown in Table 1.

[0081] (3) Electrical insulation performance test According to the test method described in GB / T 1408.1-2016, the insulation layer in the cable was cut into 0.3 mm specimens for testing. The test results are shown in Table 1.

[0082] Table 1 Test results of embodiments and comparative examples

[0083] According to Table 1, by comparing the test results of Examples 1-12 and Comparative Examples 1-2, it can be seen that the present application can greatly improve the high temperature resistance of the power cable by reasonably combining the silicone rubber and the carbon-ceramic composite material in the insulating layer and setting the weight ratio of the silicone rubber and the carbon-ceramic composite material in the range of (10~60):1.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A high temperature resistant power cable, characterized in that: The high temperature resistant power cable comprises at least one conductor core and an insulating layer coated on the surface of the conductor core, wherein the insulating layer comprises silicone rubber and a carbon-ceramic composite material, wherein the weight ratio of the silicone rubber to the carbon-ceramic composite material is (10-60):

1.

2. The high temperature resistant power cable according to claim 1, characterized in that: The insulating layer comprises the following components by weight: Silicone rubber, 100 parts by weight; The carbon-ceramic composite material has a content of 2 to 10 parts by weight of the carbon-ceramic composite material in the insulating layer based on 100 parts by weight of the silicone rubber.

3. The high temperature resistant power cable according to claim 2, characterized in that: The insulating layer further comprises the following components by weight: The carbon-ceramic composite material has a content of 4 to 8 parts by weight in the insulating layer based on 100 parts by weight of the silicone rubber.

4. The high temperature resistant power cable according to any one of claims 1 to 3, characterized in that: The carbon-ceramic composite material includes carbon fibers and a metal oxide ceramic material supported on the carbon fibers, and a mass content A of the metal oxide ceramic material in the carbon-ceramic composite material and a mass content B of the carbon fibers in the carbon-ceramic composite material satisfy 9≤A / B.

5. The high temperature resistant power cable according to claim 4, characterized in that: The mass content A of the metal oxide ceramic material in the carbon-ceramic composite material is 90%≤A≤98%.

6. The high temperature resistant power cable according to claim 4, characterized in that: The metal oxide ceramic material includes at least one of zinc oxide nanoparticles, titanium oxide nanoparticles and magnesium oxide nanoparticles; And / or, the aspect ratio of the carbon fiber is (50~200):

1.

7. The high temperature resistant power cable according to claim 1, characterized in that: The weight average molecular weight of the silicone rubber is 300,000 to 600,000.

8. The high temperature resistant power cable according to claim 1, characterized in that: The insulating layer further comprises the following components by weight: The toughening elastomer has a content of 10 to 20 parts by weight in the insulating layer based on 100 parts by weight of the silicone rubber.

9. The high temperature resistant power cable according to claim 1, characterized in that: The high temperature resistant power cable also includes: A first shielding layer, disposed between the conductor core and the insulating layer; A second shielding layer, covering a surface of the insulating layer away from the first shielding layer; The protective layer covers the surface of the second shielding layer away from the second shielding layer.

10. A method for preparing a high temperature resistant power cable according to any one of claims 1 to 9, characterized in that: include: Mixing raw materials including silicone rubber and carbon-ceramic composite material to obtain an insulating layer material; The insulating layer material is wrapped on the outside of the conductor core by co-extrusion, and an insulating layer is formed on the surface of the conductor core after cooling and crystallization, thereby obtaining a high-temperature resistant power cable.

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