A flexible power cable

Abstract

The present invention relates to the technical field of power cables, and proposes a flexible power cable, including a conductor, an insulating layer, a shielding layer and a sheath layer, wherein the insulating layer is located outside the conductor, the shielding layer is located outside the insulating layer, the sheath layer is located outside the shielding layer, and the insulating layer and the sheath layer are both prepared by a blended rubber; the blended rubber includes the following components in parts by mass: 70 parts of EPDM rubber, 30 parts of methyl vinyl silicone rubber, 40-60 parts of fillers, 4-6 parts of softeners, 5-10 parts of activators, 3-7 parts of expanders, 1-2 parts of antioxidants, 1-3 parts of vulcanizers, and 0.5-1.5 parts of accelerators; the expander includes EPDM-g-MAH and an ester compound containing a carbon-carbon double bond and an epoxy group. Through the above technical scheme, the problems of low strength and poor flexibility of silicone rubber and EPDM rubber blends in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and in particular to a flexible power cable. Background Art

[0002] Power cable is a cable product used to transmit and distribute high-power electrical energy in power systems. It has the advantages of high power supply reliability and is not easily affected by natural weather. It is widely used in transmission and distribution networks.

[0003] The basic structure of power cables consists of three parts: conductor, insulation layer and sheath layer. The insulation layer and sheath layer need to have good flexibility, oil resistance, high and low temperature resistance and flame retardancy. Power cables with good flexibility can withstand extreme temperature changes and are highly flexible. They can be used in situations where they need to withstand mechanical stress, frequent movement and extreme environments.

[0004] Flexible power cables with good comprehensive performance are usually made of silicone rubber and EPDM rubber materials, but due to the poor compatibility of silicone rubber and EPDM rubber, the strength and flexibility of the blended rubber need to be further improved. Summary of the invention

[0005] The present invention provides a flexible power cable, which solves the problem of low strength and poor flexibility of a blend of silicone rubber and EPDM rubber in the related art.

[0006] The technical solution of the present invention is as follows:

[0007] A flexible power cable, comprising a conductor, an insulating layer, a shielding layer and a sheath layer, wherein the insulating layer is located outside the conductor, the shielding layer is located outside the insulating layer, the sheath layer is located outside the shielding layer, and the insulating layer and the sheath layer are both made of a blended rubber;

[0008] The blended rubber includes the following components in parts by mass: 70 parts of ethylene propylene diene monomer rubber, 30 parts of methyl vinyl silicone rubber, 40-60 parts of filler, 4-6 parts of softener, 5-10 parts of activator, 3-7 parts of compatibilizer, 1-2 parts of antioxidant, 1-3 parts of vulcanizer, and 0.5-1.5 parts of accelerator; the compatibilizer includes EPDM-g-MAH and an ester compound containing a carbon-carbon double bond and an epoxy group.

[0009] As a further technical solution, the mass ratio of the EPDM-g-MAH to the ester compound containing a carbon-carbon double bond and an epoxy group is 2:5 to 4:3.

[0010] The present invention limits the mass ratio of EPDM-g-MAH to the ester compound containing carbon-carbon double bonds and epoxy groups to 2:5-4:3, further improving the tensile strength and elongation at break of the blended rubber, thereby further improving the strength and flexibility of the power cable.

[0011] As a further technical solution, the ester compound containing a carbon-carbon double bond and an epoxy group includes one or more of glycidyl linolenate, 2,3-epoxypropyl acrylate octadecenoic acid, 3,4-epoxycyclohexyl methyl methacrylate, and 4-(2-oxiranyl methoxy) butyl acrylate.

[0012] As a further technical solution, the ester compound containing a carbon-carbon double bond and an epoxy group is composed of glycidyl linolenate and 4-(2-oxiranylmethoxy)butyl acrylate in a mass ratio of 3:5 to 5:3.

[0013] The present invention limits the ester compounds containing carbon-carbon double bonds and epoxy groups to glycidyl linolenate and 4-(2-oxiranylmethoxy)butyl acrylate in a mass ratio of 3:5 to 5:3, further improving the tensile strength and elongation at break of the blended rubber, thereby further improving the strength and flexibility of the power cable.

[0014] As a further technical solution, the filler includes one or more of carbon black, white carbon black, magnesium hydroxide, and aluminum hydroxide.

[0015] As a further technical solution, the softener includes one or two of reduced four-line oil and pine tar oil.

[0016] As a further technical solution, the activator includes stearic acid and zinc oxide.

[0017] As a further technical solution, the antioxidant includes one or more of antioxidant MB, antioxidant RD, and antioxidant 4010NA.

[0018] As a further technical solution, the vulcanizing agent includes sulfur and peroxide.

[0019] As a further technical solution, the peroxide is 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne.

[0020] As a further technical solution, the accelerator includes one or more of N,N-dicyclohexyl-2-benzothiazole sulfenamide, 2-mercaptobenzothiazole, and dipentamethylenethiuram tetrasulfide.

[0021] The working principle and beneficial effects of the present invention are:

[0022] In the present invention, EPDM-g-MAH and ester compounds containing carbon-carbon double bonds and epoxy groups are used as compatibilizers for silicone rubber and EPDM rubber blends to improve the compatibility of the blends. Since the ester compounds containing carbon-carbon double bonds and epoxy groups can react with double bonds in methyl vinyl silicone rubber and hydroxyl groups on the surface of fillers, the dispersibility of fillers and compatibility with the blends are improved, and flexible chains are introduced into the cross-linked structure and the cross-linking degree of the blends is improved, so that the ester compounds are used in combination with EPDM-g-MAH to synergistically improve the overall compatibility of the blends, and the tensile strength and elongation at break of the blends are improved, thereby improving the strength and flexibility of the power cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] In the figure: 1 is the conductor, 2 is the insulating layer, 3 is the shielding layer, and 4 is the sheath layer. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The parameters of the raw materials in the following examples and comparative examples are as follows:

[0028] EPDM 4725P;

[0029] The weight average molecular weight of methyl vinyl silicone rubber is 550,000, and the vinyl content is 3.17%;

[0030] EPDM-g-MAH is DuPont N461 from the United States;

[0031] The carbon black is carbon black N990;

[0032] White carbon black is fumed white carbon black N20;

[0033] The kinematic viscosity of the reduced four-line oil at 100℃ is 20~30cSt, the kinematic viscosity at 40℃ is 600~900cSt, the flash point is not less than 220℃, and the solidification point is not higher than -5℃;

[0034] The content of effective substances in pine tar oil is 90wt%, and pH=4~5.

[0035] The power cable in the following embodiments and comparative examples is prepared by the following method: an insulating layer, a shielding layer and a sheath layer are sequentially coated on the conductor to obtain a power cable, the structural schematic diagram of which is shown in FIG. Figure 1 shown.

[0036] The insulating layer and the sheath layer are both made of blended rubber. The preparation method of the blended rubber is as follows:

[0037] Example 1

[0038] S1. Mix 70 parts of EPDM rubber, 7 parts of zinc oxide and 3 parts of stearic acid at 150°C and 50 rpm for 3 minutes, then add 60 parts of carbon black, 6 parts of four-wire oil, 1 part of EPDM-g-MAH and 2 parts of antioxidant MB and continue mixing for 2 minutes, then add 1 part of sulfur and 1.5 parts of N,N-dicyclohexyl-2-benzothiazole sulfenamide and mix for 2 minutes until uniform, to obtain EPDM rubber compound;

[0039] S2, after mixing 30 parts of methyl vinyl silicone rubber and 6 parts of glycidyl linolenate at 100° C. and 100 rpm for 2 min, 2 parts of 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne were added and mixing continued for 3 min to obtain a methyl vinyl silicone rubber compound;

[0040] S3. The EPDM rubber compound and the methyl vinyl silicone rubber compound were mixed at 80° C. and 50 rpm for 10 min, and then vulcanized at 180° C. and 10 MPa for 15 min to obtain a blended rubber.

[0041] Example 2

[0042] S1. After kneading 70 parts of EPDM rubber, 3 parts of zinc oxide and 2 parts of stearic acid at 150°C and 50 rpm for 3 minutes, 40 parts of white carbon black, 4 parts of pine tar, 0.5 parts of EPDM-g-MAH and 1 part of antioxidant RD were added and kneaded for 2 minutes, 0.5 parts of sulfur and 0.5 parts of dipentamethylenethiuram tetrasulfide were added and kneaded for 2 minutes until uniform, to obtain an EPDM rubber compound;

[0043] S2, after mixing 30 parts of methyl vinyl silicone rubber and 2.5 parts of 2,3-epoxypropyl octadecenoic acid at 100° C. and 100 rpm for 2 minutes, 0.5 parts of 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne were added and mixing continued for 3 minutes to obtain a methyl vinyl silicone rubber compound;

[0044] S3. The EPDM rubber compound and the methyl vinyl silicone rubber compound were mixed at 80° C. and 50 rpm for 10 min, and then vulcanized at 180° C. and 10 MPa for 15 min to obtain a blended rubber.

[0045] Example 3

[0046] S1. After kneading 70 parts of EPDM rubber, 7 parts of zinc oxide and 3 parts of stearic acid at 150°C and 50 rpm for 3 minutes, 60 parts of carbon black, 6 parts of four-line oil, 2 parts of EPDM-g-MAH and 2 parts of antioxidant MB were added and kneaded for 2 minutes. 1 part of sulfur and 1.5 parts of N,N-dicyclohexyl-2-benzothiazole sulfenamide were added and kneaded for 2 minutes until uniform, to obtain an EPDM rubber compound;

[0047] S2, after mixing 30 parts of methyl vinyl silicone rubber and 5 parts of glycidyl linolenate at 100° C. and 100 rpm for 2 min, 2 parts of 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne were added and mixing continued for 3 min to obtain a methyl vinyl silicone rubber compound;

[0048] S3. The EPDM rubber compound and the methyl vinyl silicone rubber compound were mixed at 80° C. and 50 rpm for 10 min, and then vulcanized at 180° C. and 10 MPa for 15 min to obtain a blended rubber.

[0049] Example 4

[0050] S1. Mix 70 parts of EPDM rubber, 7 parts of zinc oxide and 3 parts of stearic acid at 150°C and 50 rpm for 3 minutes, then add 60 parts of carbon black, 6 parts of four-wire oil, 3 parts of EPDM-g-MAH and 2 parts of antioxidant MB and continue mixing for 2 minutes, then add 1 part of sulfur and 1.5 parts of N,N-dicyclohexyl-2-benzothiazole sulfenamide and mix for 2 minutes until uniform, to obtain EPDM rubber compound;

[0051] S2, after mixing 30 parts of methyl vinyl silicone rubber and 4 parts of glycidyl linolenate at 100° C. and 100 rpm for 2 min, 2 parts of 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne were added and mixing continued for 3 min to obtain a methyl vinyl silicone rubber compound;

[0052] S3. The EPDM rubber compound and the methyl vinyl silicone rubber compound were mixed at 80° C. and 50 rpm for 10 min, and then vulcanized at 180° C. and 10 MPa for 15 min to obtain a blended rubber.

[0053] Example 5

[0054] S1. Mix 70 parts of EPDM rubber, 7 parts of zinc oxide and 3 parts of stearic acid at 150°C and 50 rpm for 3 minutes, then add 60 parts of carbon black, 6 parts of four-wire oil, 4 parts of EPDM-g-MAH and 2 parts of antioxidant MB and continue mixing for 2 minutes, then add 1 part of sulfur and 1.5 parts of N,N-dicyclohexyl-2-benzothiazolesulfonamide and mix for 2 minutes until uniform, to obtain EPDM rubber compound;

[0055] S2, after mixing 30 parts of methyl vinyl silicone rubber and 3 parts of glycidyl linolenate at 100° C. and 100 rpm for 2 min, 2 parts of 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne were added and mixing continued for 3 min to obtain a methyl vinyl silicone rubber compound;

[0056] S3. The EPDM rubber compound and the methyl vinyl silicone rubber compound were mixed at 80° C. and 50 rpm for 10 min, and then vulcanized at 180° C. and 10 MPa for 15 min to obtain a blended rubber.

[0057] Example 6

[0058] S1. Mix 70 parts of EPDM rubber, 7 parts of zinc oxide and 3 parts of stearic acid at 150°C and 50 rpm for 3 minutes, then add 60 parts of carbon black, 6 parts of four-line oil, 5 parts of EPDM-g-MAH and 2 parts of antioxidant MB and continue mixing for 2 minutes, then add 1 part of sulfur and 1.5 parts of N,N-dicyclohexyl-2-benzothiazole sulfenamide and mix for 2 minutes until uniform, to obtain EPDM rubber compound;

[0059] S2, after mixing 30 parts of methyl vinyl silicone rubber and 2 parts of glycidyl linolenate at 100° C. and 100 rpm for 2 minutes, 2 parts of 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne were added and mixing continued for 3 minutes to obtain a methyl vinyl silicone rubber compound;

[0060] S3. The EPDM rubber compound and the methyl vinyl silicone rubber compound were mixed at 80° C. and 50 rpm for 10 min, and then vulcanized at 180° C. and 10 MPa for 15 min to obtain a blended rubber.

[0061] Example 7

[0062] S1. Mix 70 parts of EPDM rubber, 7 parts of zinc oxide and 3 parts of stearic acid at 150°C and 50 rpm for 3 minutes, then add 60 parts of carbon black, 6 parts of four-wire oil, 3 parts of EPDM-g-MAH and 2 parts of antioxidant MB and continue mixing for 2 minutes, then add 1 part of sulfur and 1.5 parts of N,N-dicyclohexyl-2-benzothiazole sulfenamide and mix for 2 minutes until uniform, to obtain EPDM rubber compound;

[0063] S2, 30 parts of methyl vinyl silicone rubber and 4 parts of 4-(2-oxiranylmethoxy)butyl acrylate were mixed at 100° C. and 100 rpm for 2 min, and then 2 parts of 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne were added and mixed for 3 min to obtain a methyl vinyl silicone rubber compound;

[0064] S3. The EPDM rubber compound and the methyl vinyl silicone rubber compound were mixed at 80° C. and 50 rpm for 10 min, and then vulcanized at 180° C. and 10 MPa for 15 min to obtain a blended rubber.

[0065] Example 8

[0066] S1. Mix 70 parts of EPDM rubber, 7 parts of zinc oxide and 3 parts of stearic acid at 150°C and 50 rpm for 3 minutes, then add 60 parts of carbon black, 6 parts of four-wire oil, 3 parts of EPDM-g-MAH and 2 parts of antioxidant MB and continue mixing for 2 minutes, then add 1 part of sulfur and 1.5 parts of N,N-dicyclohexyl-2-benzothiazole sulfenamide and mix for 2 minutes until uniform, to obtain EPDM rubber compound;

[0067] S2, 30 parts of methyl vinyl silicone rubber, 3.5 parts of glycidyl linolenate, and 0.5 parts of 4-(2-oxiranylmethoxy)butyl acrylate were mixed at 100° C. and 100 rpm for 2 min, and then 2 parts of 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne were added and mixed for 3 min to obtain a methyl vinyl silicone rubber compound;

[0068] S3. The EPDM rubber compound and the methyl vinyl silicone rubber compound were mixed at 80° C. and 50 rpm for 10 min, and then vulcanized at 180° C. and 10 MPa for 15 min to obtain a blended rubber.

[0069] Example 9

[0070] S1. Mix 70 parts of EPDM rubber, 7 parts of zinc oxide and 3 parts of stearic acid at 150°C and 50 rpm for 3 minutes, then add 60 parts of carbon black, 6 parts of four-wire oil, 3 parts of EPDM-g-MAH and 2 parts of antioxidant MB and continue mixing for 2 minutes, then add 1 part of sulfur and 1.5 parts of N,N-dicyclohexyl-2-benzothiazole sulfenamide and mix for 2 minutes until uniform, to obtain EPDM rubber compound;

[0071] S2, 30 parts of methyl vinyl silicone rubber, 3.5 parts of linolenic acid glycidyl ester, and 0.5 parts of 3,4-epoxycyclohexyl methyl methacrylate were mixed at 100° C. and 100 rpm for 2 minutes, and then 2 parts of 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne were added and mixed for 3 minutes to obtain a methyl vinyl silicone rubber compound;

[0072] S3. The EPDM rubber compound and the methyl vinyl silicone rubber compound were mixed at 80° C. and 50 rpm for 10 min, and then vulcanized at 180° C. and 10 MPa for 15 min to obtain a blended rubber.

[0073] Example 10

[0074] S1. Mix 70 parts of EPDM rubber, 7 parts of zinc oxide and 3 parts of stearic acid at 150°C and 50 rpm for 3 minutes, then add 60 parts of carbon black, 6 parts of four-wire oil, 3 parts of EPDM-g-MAH and 2 parts of antioxidant MB and continue mixing for 2 minutes, then add 1 part of sulfur and 1.5 parts of N,N-dicyclohexyl-2-benzothiazole sulfenamide and mix for 2 minutes until uniform, to obtain EPDM rubber compound;

[0075] S2, 30 parts of methyl vinyl silicone rubber, 3.5 parts of glycidyl linolenate, and 0.5 parts of 2,3-epoxypropyl octadecenoic acid were mixed at 100° C. and 100 rpm for 2 minutes, and then 2 parts of 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne were added and mixed for 3 minutes to obtain a methyl vinyl silicone rubber compound;

[0076] S3. The EPDM rubber compound and the methyl vinyl silicone rubber compound were mixed at 80° C. and 50 rpm for 10 min, and then vulcanized at 180° C. and 10 MPa for 15 min to obtain a blended rubber.

[0077] Embodiment 11

[0078] S1. Mix 70 parts of EPDM rubber, 7 parts of zinc oxide and 3 parts of stearic acid at 150°C and 50 rpm for 3 minutes, then add 60 parts of carbon black, 6 parts of four-wire oil, 3 parts of EPDM-g-MAH and 2 parts of antioxidant MB and continue mixing for 2 minutes, then add 1 part of sulfur and 1.5 parts of N,N-dicyclohexyl-2-benzothiazole sulfenamide and mix for 2 minutes until uniform, to obtain EPDM rubber compound;

[0079] S2, 30 parts of methyl vinyl silicone rubber, 2.5 parts of linolenic acid glycidyl ester, and 1.5 parts of 4-(2-oxiranylmethoxy)butyl acrylate were mixed at 100° C. and 100 rpm for 2 min, and then 2 parts of 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne were added and mixed for 3 min to obtain a methyl vinyl silicone rubber compound;

[0080] S3. The EPDM rubber compound and the methyl vinyl silicone rubber compound were mixed at 80° C. and 50 rpm for 10 min, and then vulcanized at 180° C. and 10 MPa for 15 min to obtain a blended rubber.

[0081] Example 12

[0082] S1. Mix 70 parts of EPDM rubber, 7 parts of zinc oxide and 3 parts of stearic acid at 150°C and 50 rpm for 3 minutes, then add 60 parts of carbon black, 6 parts of four-wire oil, 3 parts of EPDM-g-MAH and 2 parts of antioxidant MB and continue mixing for 2 minutes, then add 1 part of sulfur and 1.5 parts of N,N-dicyclohexyl-2-benzothiazole sulfenamide and mix for 2 minutes until uniform, to obtain EPDM rubber compound;

[0083] S2, 30 parts of methyl vinyl silicone rubber, 1.5 parts of linolenic acid glycidyl ester, and 2.5 parts of 4-(2-oxiranylmethoxy)butyl acrylate were mixed at 100° C. and 100 rpm for 2 min, and then 2 parts of 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne were added and mixed for 3 min to obtain a methyl vinyl silicone rubber compound;

[0084] S3. The EPDM rubber compound and the methyl vinyl silicone rubber compound were mixed at 80° C. and 50 rpm for 10 min, and then vulcanized at 180° C. and 10 MPa for 15 min to obtain a blended rubber.

[0085] Embodiment 13

[0086] S1. Mix 70 parts of EPDM rubber, 7 parts of zinc oxide and 3 parts of stearic acid at 150°C and 50 rpm for 3 minutes, then add 60 parts of carbon black, 6 parts of four-wire oil, 3 parts of EPDM-g-MAH and 2 parts of antioxidant MB and continue mixing for 2 minutes, then add 1 part of sulfur and 1.5 parts of N,N-dicyclohexyl-2-benzothiazole sulfenamide and mix for 2 minutes until uniform, to obtain EPDM rubber compound;

[0087] S2, 30 parts of methyl vinyl silicone rubber, 0.5 parts of linolenic acid glycidyl ester, and 3.5 parts of 4-(2-oxiranylmethoxy)butyl acrylate were mixed at 100° C. and 100 rpm for 2 min, and then 2 parts of 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne were added and mixed for 3 min to obtain a methyl vinyl silicone rubber compound;

[0088] S3. The EPDM rubber compound and the methyl vinyl silicone rubber compound were mixed at 80° C. and 50 rpm for 10 min, and then vulcanized at 180° C. and 10 MPa for 15 min to obtain a blended rubber.

[0089] Comparative Example 1

[0090] S1. Mix 70 parts of EPDM rubber, 7 parts of zinc oxide and 3 parts of stearic acid at 150°C and 50 rpm for 3 minutes, then add 60 parts of carbon black, 6 parts of four-wire oil, 7 parts of EPDM-g-MAH and 2 parts of antioxidant MB and continue mixing for 2 minutes, then add 1 part of sulfur and 1.5 parts of N,N-dicyclohexyl-2-benzothiazole sulfenamide and mix for 2 minutes until uniform, to obtain EPDM rubber compound;

[0091] S2, mixing 30 parts of methyl vinyl silicone rubber and 2 parts of 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne at 100° C. and 100 rpm for 3 min to obtain a methyl vinyl silicone rubber compound;

[0092] S3. The EPDM rubber compound and the methyl vinyl silicone rubber compound were mixed at 80° C. and 50 rpm for 10 min, and then vulcanized at 180° C. and 10 MPa for 15 min to obtain a blended rubber.

[0093] The tensile strength and elongation at break of the blended rubbers obtained in Examples 1 to 13 and Comparative Example 1 were tested according to the method in GB / T 528-2009 “Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber” (IA type dumbbell specimens), and the test results are recorded in Table 1.

[0094] Table 1 Tensile strength and elongation at break of the blended rubber

[0095]

[0096] It can be seen from Table 1 that the silicone rubber and EPDM rubber blend provided by the present invention has a tensile strength of more than 15.9 MPa and an elongation at break of more than 856%, and has good strength and flexibility.

[0097] Compared with Comparative Example 1, in Examples 1 to 13, EPDM-g-MAH and ester compounds containing carbon-carbon double bonds and epoxy groups are added as compatibilizers for the blended rubber, and EPDM-g-MAH is added as a compatibilizer for the blended rubber in Comparative Example 1. The tensile strength and elongation at break of the blended rubber obtained in Examples 1 to 13 are higher than those in Comparative Example 1, indicating that the combination of EPDM-g-MAH and ester compounds containing carbon-carbon double bonds and epoxy groups can improve the strength and flexibility of the blended rubber, thereby improving the strength and flexibility of the power cable.

[0098] The tensile strength and elongation at break of the blended rubber obtained in Examples 3 to 5 are higher than those in Example 1 and Example 6, indicating that the mass ratio of EPDM-g-MAH to the ester compound containing a carbon-carbon double bond and an epoxy group is 2:5 to 4:3, which can further improve the tensile strength and elongation at break of the blended rubber, thereby further improving the strength and flexibility of the power cable.

[0099] The tensile strength and elongation at break of the blended rubber obtained in Examples 11 to 12 are higher than those in the other examples, indicating that the mass ratio of linolenic acid glycidyl ester and 4-(2-oxiranylmethoxy)butyl acrylate is 3:5 to 5:3, which can further improve the tensile strength and elongation at break of the blended rubber, thereby further improving the strength and flexibility of the power cable.

[0100] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible power cable, characterized in that: It comprises a conductor, an insulating layer, a shielding layer and a sheath layer, wherein the insulating layer is located outside the conductor, the shielding layer is located outside the insulating layer, the sheath layer is located outside the shielding layer, and the insulating layer and the sheath layer are both made of a blended rubber; The blended rubber includes the following components in parts by mass: 70 parts of ethylene propylene rubber, 30 parts of methyl vinyl silicone rubber, 40-60 parts of filler, 4-6 parts of softener, 5-10 parts of activator, 3-7 parts of compatibilizer, 1-2 parts of antioxidant, 1-3 parts of vulcanizer, and 0.5-1.5 parts of accelerator; the compatibilizer includes EPDM-g-MAH and an ester compound containing a carbon-carbon double bond and an epoxy group; the ester compound containing a carbon-carbon double bond and an epoxy group includes one or more of glycidyl linolenate, 2,3-epoxypropyl octadecenoic acid, 3,4-epoxycyclohexyl methyl methacrylate, and 4-(2-epoxyethylene methoxy) butyl acrylate.

2. A flexible power cable according to claim 1, characterized in that: The mass ratio of the EPDM-g-MAH to the ester compound containing a carbon-carbon double bond and an epoxy group is 2:5-4:

3.

3. A flexible power cable according to claim 1, characterized in that: The ester compound containing a carbon-carbon double bond and an epoxy group is composed of glycidyl linolenate and 4-(2-oxiranylmethoxy)butyl acrylate in a mass ratio of 3:5 to 5:

3.

4. A flexible power cable according to claim 1, characterized in that: The filler includes one or more of carbon black, white carbon black, magnesium hydroxide and aluminum hydroxide.

5. The flexible power cable according to claim 1, characterized in that: The softener includes one or two of reduced four-line oil and pine tar oil.

6. A flexible power cable according to claim 1, characterized in that: The activators include stearic acid and zinc oxide.

7. A flexible power cable according to claim 1, characterized in that: The antioxidant includes one or more of antioxidant MB, antioxidant RD, and antioxidant 4010NA.

8. The flexible power cable according to claim 1, characterized in that: The vulcanizing agents include sulfur and peroxides.

9. The flexible power cable according to claim 1, characterized in that: The accelerator includes one or more of N,N-dicyclohexyl-2-benzothiazole sulfenamide, 2-mercaptobenzothiazole, and dipentamethylenethiuram tetrasulfide.

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