Power cable ethylene propylene rubber insulation rubber material

Abstract

The invention discloses a power cable ethylene propylene rubber insulating rubber material, and relates to a power cable insulating rubber material. The problem that an existing ethylene propylene rubber insulating material is low in modulus and tensile strength is solved. The power cable ethylene propylene rubber insulation sizing material comprises the following components in parts by weight: ethylene propylene rubber 2470, ethylene-vinyl acetate copolymer, ethylene propylene rubber 4044, dicumyl peroxide, high-density paraffin oil, low-density paraffin oil, microcrystalline wax, white carbon black, superfine talcum powder, modified calcined clay, vinyl trimethoxy silane, 2-thiol benzimidazole, 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, a coupling agent, a coupling agent and an antioxidant. The catalyst is prepared from the following raw materials: a 1, 2, 4-trimethyl-1, 2-dihydroquinoline polymer, dicumyl peroxide and zinc oxide. The power cable ethylene propylene rubber insulation rubber material is simple in formula, improves the flame retardant property of the insulation material, reduces the cost of the insulation material, has the characteristics of excellent electrical performance, good processing technology and the like, also has good mechanical and physical properties, and promotes the popularization and application of ethylene propylene rubber insulation middle and high voltage power cables.

Description

Technical Field

[0001] The invention relates to an insulating rubber compound for a power cable. Background Art

[0002] The application of EPDM insulation materials in medium and high voltage cables has been quite extensive, but the low temperature flexibility, water tree resistance, electrical tree resistance and corona resistance are still insufficient. Compared with XLPE, PE and oil-paper insulation, EPDM insulation has high operating reliability and other advantages, such as high moisture resistance, almost no decrease in electrical and mechanical properties after immersion in water, high water tree formation resistance, good corona resistance and heat resistance, small thermal expansion rate and good structural stability. With the development of rubber production, processing and mixing and vulcanization technology, the reliability of EPDM (EPR) for medium and high voltage cables has been continuously improved, and its use in cable production has also been increasing.

[0003] In recent years, with the rapid development of China's economy, the contradiction of tight energy supply has become increasingly prominent and will continue for a long time. Power infrastructure has begun to be vigorously developed across the country, and wind, thermal power plants and nuclear power plants have begun to be built in large quantities. According to the design requirements of the power plant, a large number of cables need to be used as busbars, and the designed cable model specifications are 8.7 / 15kV1x500 mm. In addition, at present, more and more EPDM insulated cables are used in domestic shield cables, 8.7 / 10kV medium-voltage cables for coal mine mobile substations, and medium-voltage 3.6 / 6kV~12 / 20kV marine cables for oil platforms.

[0004] In domestic cable manufacturers, most of the ethylene propylene insulation materials used for this type of cable are imported, with a small amount provided by domestic professional material suppliers in small quantities. Given that imported materials have a long production cycle and high prices.

[0005] Selection of EPDM rubber insulation material base material Commonly used EPDM materials include EPDM and EPDM. The essential differences between different types of EPDM rubber are molecular weight, crystallinity, diene content and viscosity, which will affect the rubber's process performance, extrusion performance, cold and hot strength and physical properties. According to specific applications, it can be simply divided into amorphous and semi-crystalline, and can be further distinguished by viscosity and diene content. Generally speaking, semi-crystalline rubber has high hardness, high modulus and high tensile strength, and has excellent electrical and physical properties, but the mechanical and physical properties of semi-crystalline rubber are poor, and the modulus and tensile strength are relatively low. Summary of the invention

[0006] In order to solve the problem that the modulus and tensile strength of the existing ethylene propylene rubber insulation material are both relatively low, the present invention provides an ethylene propylene rubber insulation compound for power cables.

[0007] The ethylene-propylene rubber insulation rubber material for the power cable of the present invention comprises the following components by weight: 16-22 parts of ethylene-propylene rubber 2470; 100-121 parts of ethylene-vinyl acetate copolymer; 17-28 parts of ethylene-propylene rubber 4044; 12-15 parts of diisopropylbenzene peroxide; 1.5-1.2 parts of high-density paraffin oil; 7-10 parts of low-density paraffin oil; 2.0-3.5 parts of microcrystalline wax; 5-8 parts of white carbon black; 12-21 parts of ultrafine talc; 12-16 parts of modified calcined clay; 0.2-0.5 parts of vinyl trimethoxysilane; 0.4-0.86 parts of 2-thiol benzimidazole; 0.1-0.5 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer; 0.8-2.4 parts of diisopropylbenzene peroxide; and 8-20 parts of zinc oxide.

[0008] The preparation method of the ethylene-propylene rubber insulation compound for power cables of the present invention is as follows:

[0009] 1. Weigh the raw materials according to the weight of EPDM rubber insulation compound for power cables:

[0010] The ethylene-propylene rubber insulation rubber material for the power cable comprises the following components by weight: 16-22 parts of ethylene-propylene rubber 2470; 100-121 parts of ethylene-vinyl acetate copolymer; 17-28 parts of ethylene-propylene rubber 4044; 12-15 parts of diisopropylbenzene peroxide; 1.5-1.2 parts of high-density paraffin oil; 7-10 parts of low-density paraffin oil; 2.0-3.5 parts of microcrystalline wax; 5-8 parts of white carbon black; 12-21 parts of ultrafine talc; 12-16 parts of modified calcined clay; 0.2-0.5 parts of vinyl trimethoxysilane; 0.4-0.86 parts of 2-thiol benzimidazole; 0.1-0.5 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer; 0.8-2.4 parts of diisopropylbenzene peroxide; and 8-20 parts of zinc oxide.

[0011] 2. Mix the raw materials weighed in step 1 evenly, with the mixing temperature at 50-70°C and the debonding temperature at 160-180°C, and then prepare the pellets.

[0012] The principles and beneficial effects of the present invention are:

[0013] The ethylene-propylene rubber insulation compound for power cables of the present invention has a simple formula, and the use of the compound can not only greatly improve the flame retardant performance of the insulation material, but also reduce the cost of the insulation material, thereby reducing the cost of the cable. The cable prepared by the ethylene-propylene rubber insulation compound for power cables of the present invention has high strength, good heat resistance, high flame retardancy, low smoke emission, and is non-toxic and non-corrosive.

[0014] The ethylene-propylene rubber insulating compound for power cables of the present invention has the characteristics of excellent electrical properties, good processing technology, etc., and also has very good mechanical and physical properties. The performance of cable products produced by using the insulating material meets the requirements of IEC60502.

[0015] The ethylene propylene rubber insulation compound for power cables of the present invention reduces the cost and promotes the popularization and application of ethylene propylene rubber insulated medium and high voltage power cables. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is not limited to the specific implementation modes listed below, but also includes any reasonable combination of the specific implementation modes.

[0017] Specific implementation method 1: In this implementation method, the ethylene-propylene rubber insulation rubber material of the power cable includes the following components by weight: ethylene-propylene rubber 2470: 16-22 parts; ethylene-vinyl acetate copolymer: 100-121 parts, ethylene-propylene rubber 4044: 17-28 parts; diisopropylbenzene peroxide: 12-15 parts; high-density paraffin oil: 1.5-1.2 parts; low-density paraffin oil: 7-10 parts; microcrystalline paraffin: 2. 0-3.5 parts; white carbon black: 5-8 parts; ultrafine talc: 12-21 parts; modified calcined clay: 12-16 parts; vinyl trimethoxysilane: 0.2-0.5 parts; 2-mercaptobenzimidazole: 0.4-0.86 parts; 2,2,4-trimethyl-1,2-dihydroquinoline polymer: 0.1-0.5 parts; diisopropylbenzene peroxide: 0.8-2.4 parts; zinc oxide: 8-20 parts.

[0018] This embodiment has the following beneficial effects:

[0019] The ethylene propylene rubber insulation compound for power cables of the present embodiment has a simple formula, and the use of the compound can not only greatly improve the flame retardant performance of the insulation material, but also reduce the cost of the insulation material, thereby reducing the cost of the cable. The cable prepared by the ethylene propylene rubber insulation compound for power cables of the present invention has high strength, good heat resistance, high flame retardancy, low smoke emission, and is non-toxic and non-corrosive.

[0020] The ethylene propylene rubber insulation material of the power cable in this embodiment has the characteristics of excellent electrical properties, good processing technology, etc., and also has good mechanical and physical properties. The performance of the cable product produced using this insulation material meets the requirements of IEC60502.

[0021] The EPDM rubber insulation compound for power cables in this embodiment reduces the cost and promotes the popularization and application of EPDM rubber insulated medium and high voltage power cables.

[0022] Specific embodiment 2: This embodiment is different from specific embodiment 1 in that the EPDM insulating rubber material for power cable includes the following components by weight: EPDM 2470: 22 parts; ethylene-vinyl acetate copolymer: 121 parts, EPDM 4044: 17 parts; diisopropylbenzene peroxide: 13 parts; high-density paraffin oil: 1.3 parts; low-density paraffin oil: 9 parts; microcrystalline paraffin: 2.0 parts; white carbon black: 5 parts; ultrafine talc: 21 parts; modified calcined clay: 12 parts; vinyl trimethoxysilane: 0.2 parts; 2-thiol benzimidazole: 0.4 parts; 2,2,4-trimethyl-1,2-dihydroquinoline polymer: 0.1 parts; diisopropylbenzene peroxide: 2 parts; zinc oxide: 10 parts.

[0023] Specific implementation method three: This implementation method is different from specific implementation method one or two in that: the ethylene-propylene rubber insulation rubber material for power cable includes the following components by weight: ethylene-propylene rubber 2470: 22 parts; ethylene-vinyl acetate copolymer: 121 parts, ethylene-propylene rubber 4044: 17 parts; diisopropylbenzene peroxide: 13 parts; high-density paraffin oil: 1.3 parts; low-density paraffin oil: 9 parts; microcrystalline paraffin: 2.0 parts; white carbon black: 5 parts; ultrafine talc: 21 parts; modified calcined clay: 12 parts; vinyl trimethoxysilane: 0.2 parts; 2-thiol benzimidazole: 0.4 parts; 2,2,4-trimethyl-1,2-dihydroquinoline polymer: 0.1 parts; diisopropylbenzene peroxide: 2 parts; zinc oxide: 10 parts.

[0024] Specific implementation method 4: This implementation method is different from any one of specific implementation methods 1 to 3 in that: the density of the high-density paraffin oil is 0.827-0.890 g / mL.

[0025] Specific implementation method 5: This implementation method is different from any one of specific implementation methods 1 to 4 in that the particle size of the ultrafine talc powder is 2000 mesh.

[0026] Specific implementation method 6: This implementation method is different from any one of specific implementation methods 1 to 5 in that: the modified calcined clay is 500 mesh.

[0027] Specific implementation method 7: This implementation method is different from any one of specific implementation methods 1 to 6 in that: the average molecular weight of the ethylene-vinyl acetate copolymer is 8,000.

[0028] Specific implementation eight: This implementation differs from any one of specific implementations one to seven in that: the white carbon black is 800 mesh.

[0029] Specific embodiment 9: This embodiment is different from any one of specific embodiments 1 to 8 in that the ethylene WT of the ethylene-propylene rubber 4044 is 61, and the monomer ENB is 4.

[0030] Specific embodiment 10: This embodiment differs from the specific embodiments 1 to 9 in that the density of the 2,2,4-trimethyl-1,2-dihydroquinoline polymer is 0.952 g / cm 3 .

[0031] Example 1

[0032] The ethylene-propylene rubber insulation material of the power cable of this embodiment includes the following components in parts by weight: ethylene-propylene rubber 2470: 22 parts; ethylene-vinyl acetate copolymer: 121 parts, ethylene-propylene rubber 4044: 17 parts; diisopropylbenzene peroxide: 13 parts; high-density paraffin oil: 1.3 parts; low-density paraffin oil: 9 parts; microcrystalline paraffin: 2.0 parts; white carbon black: 5 parts; ultrafine talc: 21 parts; modified calcined clay: 12 parts; vinyl trimethoxysilane: 0.2 parts; 2-thiol benzimidazole: 0.4 parts; 2,2,4-trimethyl-1,2-dihydroquinoline polymer: 0.1 parts; diisopropylbenzene peroxide: 2 parts; zinc oxide: 10 parts.

[0033] The preparation method of the ethylene-propylene rubber insulation compound for power cables in this embodiment is as follows:

[0034] 1. Weigh the raw materials according to the weight of EPDM rubber insulation compound for power cables:

[0035] The ethylene-propylene rubber insulation rubber material for the power cable comprises the following components in parts by weight: 22 parts of ethylene-propylene rubber 2470; 121 parts of ethylene-vinyl acetate copolymer; 17 parts of ethylene-propylene rubber 4044; 13 parts of diisopropylbenzene peroxide; 1.3 parts of high-density paraffin oil; 9 parts of low-density paraffin oil; 2.0 parts of microcrystalline wax; 5 parts of white carbon black; 21 parts of ultrafine talc; 12 parts of modified calcined clay; 0.2 parts of vinyl trimethoxysilane; 0.4 parts of 2-thiol benzimidazole; 0.1 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer; 2 parts of diisopropylbenzene peroxide; and 10 parts of zinc oxide.

[0036] 2. Mix the raw materials weighed in step 1 evenly, with the mixing temperature at 60°C and the debonding temperature at 170°C, and then prepare the pellets.

[0037] The EPDM rubber insulation compound for power cables prepared in this embodiment has excellent weather resistance, ozone resistance, heat resistance, acid and alkali resistance, water vapor resistance, color stability, electrical properties, oil filling and fluidity at room temperature. The prepared EPDM rubber products can be used for a long time at 120°C, and can be used briefly or intermittently at 150-200°C. The EPDM rubber can last for more than 150 hours without cracking under the conditions of ozone concentration of 50pphm and stretching of 30%. After being immersed in superheated water at 125°C for 15 months, the mechanical properties change very little, and the volume expansion rate is only 0.3%.

[0038] Example 2

[0039] The ethylene-propylene rubber insulation material of the power cable of this embodiment includes the following components in parts by weight: ethylene-propylene rubber 2470: 22 parts; ethylene-vinyl acetate copolymer: 121 parts, ethylene-propylene rubber 4044: 17 parts; diisopropylbenzene peroxide: 13 parts; high-density paraffin oil: 1.5 parts; low-density paraffin oil: 7 parts; microcrystalline paraffin: 2.0 parts; white carbon black: 5 parts; ultrafine talc: 21 parts; modified calcined clay: 12 parts; vinyl trimethoxysilane: 0.2 parts; 2-thiol benzimidazole: 0.4 parts; 2,2,4-trimethyl-1,2-dihydroquinoline polymer: 0.1 parts; diisopropylbenzene peroxide: 2 parts; zinc oxide: 10 parts.

[0040] The preparation method of the ethylene-propylene rubber insulation compound for power cables in this embodiment is as follows:

[0041] 1. Weigh the raw materials according to the weight of EPDM rubber insulation compound for power cables:

[0042] The ethylene-propylene rubber insulation rubber material for the power cable comprises the following components in parts by weight: 22 parts of ethylene-propylene rubber 2470; 121 parts of ethylene-vinyl acetate copolymer; 17 parts of ethylene-propylene rubber 4044; 13 parts of diisopropylbenzene peroxide; 1.5 parts of high-density paraffin oil; 7 parts of low-density paraffin oil; 2.0 parts of microcrystalline wax; 5 parts of white carbon black; 21 parts of ultrafine talc; 12 parts of modified calcined clay; 0.2 parts of vinyl trimethoxysilane; 0.4 parts of 2-thiol benzimidazole; 0.1 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer; 2 parts of diisopropylbenzene peroxide; and 10 parts of zinc oxide.

[0043] 2. Mix the raw materials weighed in step 1 evenly, with the opening temperature of the mixing process being 62°C and the debonding temperature being 165°C, and then prepare the pellets.

[0044] The EPDM rubber insulation compound for power cables prepared in this embodiment has excellent weather resistance, ozone resistance, heat resistance, acid and alkali resistance, water vapor resistance, color stability, electrical properties, oil filling and fluidity at room temperature. The prepared EPDM rubber products can be used for a long time at 120°C, and can be used briefly or intermittently at 150-200°C. The EPDM rubber can last for more than 150 hours without cracking under the conditions of ozone concentration of 50pphm and stretching of 30%. After being immersed in superheated water at 125°C for 15 months, the mechanical properties change very little, and the volume expansion rate is only 0.25%.

Claims

1. An ethylene-propylene rubber insulation compound for power cables, characterized in that: The EPDM rubber insulation compound for power cables includes the following components by weight: EPDM 2470: 16-22 parts; ethylene-vinyl acetate copolymer: 100-121 parts; EPDM 4044: 17-28 parts; Diisopropylbenzene peroxide: 12-15 parts; high-density paraffin oil: 1.5-1.2 parts; low-density paraffin oil: 7-10 parts; microcrystalline paraffin: 2.0-3.5 parts; white carbon black: 5-8 parts; ultrafine talc: 12-21 parts; modified calcined clay: 12-16 parts; vinyltrimethoxysilane: 0.2-0.5 parts; 2-mercaptobenzimidazole: 0.4-0.86 parts; 2,2,4-trimethyl-1,2-dihydroquinoline polymer: 0.1-0.5 parts; diisopropylbenzene peroxide: 0.8-2.4 parts; zinc oxide: 8-20 parts.

2. The ethylene-propylene rubber insulation compound for power cables according to claim 1, characterized in that: The EPDM rubber insulation compound for power cables includes the following components by weight: EPDM 2470: 22 parts; ethylene-vinyl acetate copolymer: 121 parts; EPDM 4044: 17 parts; Diisopropylbenzene peroxide: 13 parts; high-density paraffin oil: 1.3 parts; low-density paraffin oil: 9 parts; microcrystalline paraffin: 2.0 parts; white carbon black: 5 parts; ultrafine talc: 21 parts; modified calcined clay: 12 parts; vinyl trimethoxysilane: 0.2 parts; 2-mercaptobenzimidazole: 0.4 parts; 2,2,4-trimethyl-1,2-dihydroquinoline polymer: 0.1 parts; diisopropylbenzene peroxide: 2 parts; Zinc oxide: 10 parts.

3. The ethylene-propylene rubber insulation compound for power cables according to claim 1, characterized in that: The EPDM rubber insulation compound for power cables includes the following components by weight: EPDM 2470: 22 parts; ethylene-vinyl acetate copolymer: 121 parts; EPDM 4044: 17 parts; Diisopropylbenzene peroxide: 13 parts; high-density paraffin oil: 1.3 parts; low-density paraffin oil: 9 parts; microcrystalline paraffin: 2.0 parts; white carbon black: 5 parts; ultrafine talc: 21 parts; modified calcined clay: 12 parts; vinyl trimethoxysilane: 0.2 parts; 2-mercaptobenzimidazole: 0.4 parts; 2,2,4-trimethyl-1,2-dihydroquinoline polymer: 0.1 parts; diisopropylbenzene peroxide: 2 parts; Zinc oxide: 10 parts.

4. The ethylene-propylene rubber insulation compound for power cables according to claim 1, characterized in that: The density of the high-density paraffin oil is 0.827-0.890 g / mL.

5. The ethylene-propylene rubber insulation compound for power cables according to claim 1, characterized in that: The particle size of the ultrafine talcum powder is 2000 meshes.

6. The ethylene-propylene rubber insulation compound for power cables according to claim 1, characterized in that: The modified calcined clay is 500 meshes.

7. The ethylene-propylene rubber insulation compound for power cables according to claim 1, characterized in that: The average molecular weight of the ethylene-vinyl acetate copolymer is 8,000.

8. The ethylene-propylene rubber insulation compound for power cables according to claim 1, characterized in that: The white carbon black is 800 mesh.

9. The ethylene-propylene rubber insulation compound for power cables according to claim 1, characterized in that: The ethylene WT of the EPDM rubber 4044 is 61, and the monomer ENB is 4.

10. The ethylene-propylene rubber insulation compound for power cables according to claim 1, characterized in that: The density of the 2,2,4-trimethyl-1,2-dihydroquinoline polymer is 0.952 g / cm 3 .