A cable sheathing compound, its preparation method and application

Abstract

This invention provides a cable sheathing compound, its preparation method, and its application. The cable sheathing compound includes a polyurethane elastomer, ethylene-vinyl acetate copolymer, hydrogenated nitrile rubber, styrene-butadiene rubber, modified hydrogenated styrene-butadiene block copolymer, heat-resistant filler, compatibilizer, crosslinking agent, flame retardant modifier, anti-aging agent, antioxidant, and lubricant. The cable sheathing compound of this invention has the characteristics of good mechanical properties, good high-temperature and low-temperature resistance, high flexibility, halogen-free flame retardancy, and good weather resistance.

Description

Technical Field

[0001] This invention belongs to the field of cable material technology, specifically relating to a cable sheathing compound, its preparation method, and its application. Background Technology

[0002] Energy storage cables generally refer to the connecting cables between batteries, between battery packs, and between battery packs and combiner boxes or converters in battery energy storage systems. These cables are used in DC systems with rated voltages of DC 600V, DC 1000V, and DC 1500V, and have a maximum temperature resistance of 150℃. Due to the special operating environment of energy storage cables, strict requirements are placed on their thermal life, high temperature resistance, low temperature resistance, acid and alkali resistance, salt spray resistance, flexibility, mechanical properties, low smoke and halogen-free properties, and combustion performance.

[0003] CN109401080A discloses a cable material, its preparation method, and its application. The cable material comprises the following raw material components in parts by weight: 10-30 parts of EPDM rubber, 5-10 parts of polyethylene, 2-5 parts of polyurethane elastomer, 50-60 parts of filler, 0.1-2 parts of compatibilizer, 0.1-2 parts of crosslinking agent, and 0.1-0.5 parts of gamma ray protectant. The cable material provided by this technical solution has high elongation, tear resistance, good flexibility, insulation, heat aging resistance, and cold resistance, but low tensile strength.

[0004] CN106543514A discloses a low-cost crack-resistant and flame-retardant polyethylene cable material and its preparation method. The low-cost crack-resistant and flame-retardant polyethylene cable material comprises the following components in parts by weight: 15-30 parts of polyethylene resin, 10-30 parts of compatibilizer, 2-10 parts of carbon black masterbatch, 20-50 parts of flame retardant, 2-15 parts of silicone masterbatch flame retardant, 0.2-2.0 parts of antioxidant, and 0.2-2.0 parts of lubricant. The low-cost crack-resistant and flame-retardant polyethylene cable material provided by this technical solution has the characteristics of low cost, no halogen, lead and other heavy metals, and good mechanical properties, processing properties, crack resistance and flame retardant properties, but the flexibility, high temperature resistance and low temperature resistance need to be further improved.

[0005] CN108250632A discloses a high-hardness flame-retardant cable material and its preparation method. The high-hardness flame-retardant cable material comprises the following raw materials in parts by weight: 20-30 parts of polyvinyl chloride resin, 17-28 parts of low-density polyethylene, 10-20 parts of polycarbonate, 5-12 parts of ethylene propylene diene monomer (EPDM) rubber, 6-11 parts of ethylene-vinyl acetate copolymer, 4-9 parts of maleic anhydride graft, 3-7 parts of aluminum hydroxide, 2-5 parts of zinc borate, 2-4 parts of antimony trioxide, 5-10 parts of modified kaolin, 3-8 parts of hydroxymethyl starch, 2-4 parts of plasticizer, 1-3 parts of lubricant, 2-4 parts of ultraviolet absorber, 1-4 parts of crosslinking agent, and 2-3 parts of calcium-zinc composite heat stabilizer. The high-hardness flame-retardant cable material provided by this technical solution has excellent flame retardant, insulation, and mechanical properties, but it has high hardness and poor flexibility.

[0006] Existing materials such as polyvinyl chloride, cross-linked polyolefin, and cross-linked elastomers used as cable sheathing materials are difficult to fully meet the requirements of various aspects such as halogen-free flame retardancy, aging resistance, high temperature resistance, low temperature resistance, long thermal life, weather resistance, flexibility, and mechanical properties.

[0007] Therefore, it is necessary to develop an energy storage cable sheath compound with good mechanical properties, good high and low temperature resistance, high flexibility, halogen-free flame retardancy, and long service life. Summary of the Invention

[0008] To address the shortcomings of existing technologies, the present invention aims to provide a cable sheathing compound, its preparation method, and its application. The cable sheathing compound has the characteristics of good mechanical properties, good high and low temperature resistance, high flexibility, halogen-free flame retardancy, and good weather resistance.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] In a first aspect, the present invention provides a cable sheathing compound, the cable sheathing compound comprising a polyurethane elastomer, an ethylene-vinyl acetate copolymer, hydrogenated nitrile rubber, styrene-butadiene rubber, modified hydrogenated styrene-butadiene block copolymer, a heat-resistant filler, a compatibilizer, a crosslinking agent, a flame retardant modifier, an anti-aging agent, an antioxidant, and a lubricant.

[0011] In this invention, the heat resistance, strength, and tear resistance of the cable sheath compound are improved by adding hydrogenated nitrile butadiene rubber; the oxidation resistance, strength, and tear resistance of the cable sheath compound are improved by adding modified hydrogenated styrene-butadiene block copolymer. The cable sheath compound prepared by the compounding of the polyurethane elastomer, ethylene-vinyl acetate copolymer, hydrogenated nitrile butadiene rubber, styrene-butadiene rubber, modified hydrogenated styrene-butadiene block copolymer, heat-resistant filler, and compatibilizer exhibits high flexibility, good mechanical properties, good high and low temperature resistance, halogen-free flame retardancy, and good weather resistance.

[0012] In this invention, the high temperature refers to 120℃~150℃, and the low temperature refers to -40℃~-20℃.

[0013] Preferably, the modified hydrogenated styrene-butadiene block copolymer is prepared by mixing and granulating inorganic fillers and hydrogenated styrene-butadiene block copolymer.

[0014] Preferably, the inorganic filler comprises montmorillonite and / or graphene.

[0015] Preferably, the inorganic filler includes montmorillonite and graphene.

[0016] In this invention, a modified hydrogenated styrene-butadiene block copolymer is prepared by compounding an inorganic filler with a hydrogenated styrene-butadiene block copolymer. This copolymer is then compounded with other components, which increases the dispersion uniformity of the inorganic filler. By using montmorillonite and graphene as inorganic fillers, the resulting cable sheathing compound exhibits higher tensile and tear strength.

[0017] Preferably, the mass ratio of montmorillonite to graphene is 0.5-2:1, such as 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, 1.1:1, 1.2:1, 1.3:1, 1.5:1, 1.7:1 or 1.9:1.

[0018] In this invention, the mass ratio of montmorillonite to graphene is 0.5-2:1. If the mass ratio of montmorillonite to graphene is too low or too high, the mechanical properties will decrease.

[0019] Preferably, the inorganic filler has a mass percentage of 30%-40%, such as 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, or 39%, based on the total mass of the inorganic filler and the hydrogenated styrene-butadiene block copolymer as 100%.

[0020] Preferably, the heat-resistant filler comprises any one or a combination of at least two of hydrotalcite, silicon nitride, or kaolin.

[0021] Preferably, the compatibilizer comprises an ethylene-acrylate-maleic anhydride terpolymer and maleic anhydride-grafted polyethylene.

[0022] In this invention, a compatibilizer is used by compounding ethylene-acrylate-maleic anhydride terpolymer and maleic anhydride-grafted polyethylene, which has a good compatibilizing effect and results in a cable sheath compound with higher mechanical properties.

[0023] Preferably, the mass ratio of the ethylene-acrylate-maleic anhydride terpolymer to the maleic anhydride-grafted polyethylene is 0.4-0.8:2, for example, 0.45:2, 0.5:2, 0.55:2, 0.6:2, 0.65:2, 0.7:2 or 0.75:2, etc.

[0024] In this invention, the mass ratio of the ethylene-acrylate-maleic anhydride terpolymer to maleic anhydride-grafted polyethylene is 0.4-0.8:2. If the mass ratio of the ethylene-acrylate-maleic anhydride terpolymer to maleic anhydride-grafted polyethylene is too low or too high, the compatibility and mechanical properties will decrease.

[0025] Preferably, the crosslinking agent comprises any one or a combination of at least two of triallyl isocyanurate, triallyl cyanurate, or trimethylolpropane trimethacrylate.

[0026] Preferably, the flame retardant modifier includes any one or a combination of at least two of the following: hydroxide flame retardants, polyphosphate flame retardants, or ammonium octamolate.

[0027] Preferably, the mass ratio of the hydroxide flame retardant, the polyphosphate flame retardant, and the ammonium octamolate is 5-8:2.5-5:1, for example, 5.5:3:1, 6:3:1, 7:3:1, 7.5:3:1, 5.5:4:1, 6:4:1, 7:4:1, 7.5:4:1, 5.5:4.5:1, 6:4.5:1, 7:4.5:1, or 7.5:4.5:1, etc.

[0028] Preferably, the anti-aging agent includes anti-aging agent 4010NA and / or anti-aging agent RD.

[0029] Preferably, the antioxidant includes any one or a combination of at least two of antioxidants 1010, 2246, 1035, 1024, or 264.

[0030] Preferably, the lubricant comprises any one or a combination of at least two of calcium stearate, zinc stearate, or polyethylene wax.

[0031] Preferably, the cable sheath compound comprises the following components by weight: 20-30 parts of polyurethane elastomer (e.g., 21, 22, 23, 24, 25, 26, 27, 28, or 29 parts, etc.), 40-60 parts of ethylene-vinyl acetate copolymer (e.g., 41, 42, 44, 45, 48, 50, 52, 55, 57, or 59 parts, etc.), and 10-15 parts of hydrogenated nitrile rubber (e.g., 10.5, 11, 1...). 1.5 parts, 12 parts, 12.5 parts, 13 parts, 13.5 parts, 14 parts or 14.5 parts, etc.), 5-10 parts of styrene-butadiene rubber (e.g., 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts or 9.5 parts, etc.), 10-20 parts of modified hydrogenated styrene-butadiene block copolymer (e.g., 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts or 19 parts, etc.), 5-10 parts of heat-resistant filler (e.g., 5.5 parts). 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts or 9.5 parts, etc.), compatibilizer 6-8 parts (e.g. 6.2 parts, 6.5 parts, 6.7 parts, 6.9 parts, 7 parts, 7.2 parts, 7.5 parts or 7.8 parts, etc.), crosslinking agent 3-6 parts (e.g. 3.2 parts, 3.5 parts, 4 parts, 4.2 parts, 4.5 parts, 5 parts, 5.5 parts or 5.8 parts, etc.), flame retardant modifier 32-40 parts (e.g. 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, etc.). 0.5-2 parts of anti-aging agent (e.g., 0.6, 0.8, 1, 1.2, 1.5, 1.7, or 1.9 parts), 0.1-1 part of antioxidant (e.g., 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9 parts), and 0.1-1 part of lubricant (e.g., 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9 parts).

[0032] In a second aspect, the present invention provides a method for preparing cable sheathing compound as described in the first aspect, the method comprising the following steps: mixing polyurethane elastomer, ethylene-vinyl acetate copolymer, hydrogenated nitrile rubber, styrene-butadiene rubber, modified hydrogenated styrene-butadiene block copolymer, heat-resistant filler, compatibilizer, crosslinking agent, flame retardant modifier, anti-aging agent, antioxidant, and lubricant, and granulating to obtain the cable sheathing compound.

[0033] Thirdly, the present invention provides an energy storage cable, the energy storage cable comprising a center conductor, a non-hygroscopic wrapping tape, an insulation layer and a sheath layer, the sheath layer being prepared by irradiation crosslinking of the cable sheath rubber material as described in the first aspect.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] In this invention, the cable sheath compound prepared by compounding polyurethane elastomer, ethylene-vinyl acetate copolymer, hydrogenated nitrile rubber, styrene-butadiene rubber, modified hydrogenated styrene-butadiene block copolymer, heat-resistant filler, compatibilizer, crosslinking agent, flame retardant modifier, anti-aging agent, antioxidant, and lubricant has the characteristics of high flexibility, good mechanical properties, good high and low temperature resistance, halogen-free flame retardancy, and good weather resistance. Detailed Implementation

[0036] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0037] Example 1

[0038] This embodiment provides a cable sheathing compound and its preparation method. The cable sheathing compound comprises the following components by mass parts: 25 parts of polyurethane elastomer (Bayer 9385, Germany), 50 parts of ethylene-vinyl acetate copolymer (Formosa Plastics 7350M), 12 parts of hydrogenated nitrile rubber (NBR Zetpol 1020, NW), 8 parts of styrene-butadiene rubber (Denki Chemical CN08, Japan), 15 parts of modified hydrogenated styrene-butadiene block copolymer, 8 parts of heat-resistant filler (hydrotalcite), 7 parts of compatibilizer, 5 parts of crosslinking agent (trimethylene isocyanate), 35 parts of flame retardant modifier (a mixture of magnesium hydroxide, pentaerythritol ammonium polyphosphate, and ammonium octamolate in a mass ratio of 5:4:1), 1 part of anti-aging agent (anti-aging agent 4010NA), 0.5 parts of antioxidant (antioxidant 1010), and 0.5 parts of lubricant (calcium stearate).

[0039] The compatibilizer is an ethylene-acrylate-maleic anhydride terpolymer (Arkema 3410) and maleic anhydride-grafted polyethylene (Arkema 18300) in a mass ratio of 0.5:2.

[0040] The modified hydrogenated styrene-butadiene block copolymer was prepared by the following method:

[0041] 35 parts by weight of inorganic filler (a mixture of montmorillonite and graphene in a mass ratio of 0.5:1) and 65 parts by weight of hydrogenated styrene-butadiene block copolymer (Yuehua SEBS503) were mixed, fed into a twin-screw extruder, extruded at 190°C, and granulated to obtain the modified hydrogenated styrene-butadiene block copolymer.

[0042] The preparation method of the above-mentioned cable sheath adhesive is as follows:

[0043] Polyurethane elastomer, ethylene-vinyl acetate copolymer, hydrogenated nitrile rubber, styrene-butadiene rubber, modified hydrogenated styrene-butadiene block copolymer, heat-resistant filler, compatibilizer, crosslinking agent, flame retardant modifier, anti-aging agent, antioxidant, and lubricant are mixed, added to a twin-screw extruder, extruded at 190°C, and granulated to obtain the cable sheath compound.

[0044] Example 2

[0045] This embodiment provides a cable sheathing compound and its preparation method. The cable sheathing compound comprises the following components by mass parts: 20 parts of polyurethane elastomer (Bayer 9385, Germany), 40 parts of ethylene-vinyl acetate copolymer (Formosa Plastics 7350M), 10 parts of hydrogenated nitrile rubber (NBR Zetpol 1020, NWYG), 5 parts of styrene-butadiene rubber (Denki Chemical CN08, Japan), 10 parts of modified hydrogenated styrene-butadiene block copolymer, 5 parts of heat-resistant filler (silicon nitride), 6 parts of compatibilizer, 3 parts of co-crosslinking agent (tracene cyanurate or trimethylolpropane trimethacrylate), 32 parts of flame retardant modifier (a mixture of magnesium hydroxide, pentaerythritol ammonium polyphosphate, and ammonium octamolate in a mass ratio of 5:2.5:1), 2 parts of anti-aging agent (anti-aging agent RD), 0.1 parts of antioxidant (antioxidant 2246), and 1 part of lubricant (zinc stearate).

[0046] The compatibilizer is an ethylene-acrylate-maleic anhydride terpolymer (Arkema 3410) and maleic anhydride-grafted polyethylene (Arkema 18300) in a mass ratio of 0.4:2.

[0047] The modified hydrogenated styrene-butadiene block copolymer was prepared by the following method:

[0048] 30 parts by weight of inorganic filler (a mixture of montmorillonite and graphene in a mass ratio of 0.5:1) and 70 parts by weight of hydrogenated styrene-butadiene block copolymer (Yuehua SEBS503) were mixed, fed into a twin-screw extruder, extruded at 190°C, and granulated to obtain the modified hydrogenated styrene-butadiene block copolymer.

[0049] The preparation method of the above-mentioned cable sheath adhesive is as follows:

[0050] Polyurethane elastomer, ethylene-vinyl acetate copolymer, hydrogenated nitrile rubber, styrene-butadiene rubber, modified hydrogenated styrene-butadiene block copolymer, heat-resistant filler, compatibilizer, crosslinking agent, flame retardant modifier, anti-aging agent, antioxidant, and lubricant are mixed, added to a twin-screw extruder, extruded at 190°C, and granulated to obtain the cable sheath compound.

[0051] Example 3

[0052] This embodiment provides a cable sheathing compound and its preparation method. The cable sheathing compound comprises the following components by mass parts: 30 parts of polyurethane elastomer (Bayer 9385, Germany), 60 parts of ethylene-vinyl acetate copolymer (Formosa Plastics 7350M), 15 parts of hydrogenated nitrile rubber (NBR Zetpol 1020, NW), 10 parts of styrene-butadiene rubber (Denki Chemical CN08, Japan), 20 parts of modified hydrogenated styrene-butadiene block copolymer, 10 parts of heat-resistant filler (kaolin), 8 parts of compatibilizer, 6 parts of crosslinking agent (trimethylolpropane trimethacrylate), 40 parts of flame retardant modifier (a mixture of magnesium hydroxide, pentaerythritol ammonium polyphosphate, and ammonium octamolate in a mass ratio of 8:5:1), 2 parts of anti-aging agent (anti-aging agent 4010NA), 0.1 parts of antioxidant (antioxidant 1035), and 0.1 parts of lubricant (polyethylene wax).

[0053] The compatibilizer is an ethylene-acrylate-maleic anhydride terpolymer (Arkema 3410) and maleic anhydride-grafted polyethylene (Arkema 18300) in a mass ratio of 0.8:2.

[0054] The modified hydrogenated styrene-butadiene block copolymer was prepared by the following method:

[0055] 40 parts by weight of inorganic filler (a mixture of montmorillonite and graphene in a mass ratio of 2:1) and 60 parts by weight of hydrogenated styrene-butadiene block copolymer (Yuehua SEBS503) were mixed, fed into a twin-screw extruder, extruded at 190°C, and granulated to obtain the modified hydrogenated styrene-butadiene block copolymer.

[0056] The preparation method of the above-mentioned cable sheath adhesive is as follows:

[0057] Polyurethane elastomer, ethylene-vinyl acetate copolymer, hydrogenated nitrile rubber, styrene-butadiene rubber, modified hydrogenated styrene-butadiene block copolymer, heat-resistant filler, compatibilizer, crosslinking agent, flame retardant modifier, anti-aging agent, antioxidant, and lubricant are mixed, added to a twin-screw extruder, extruded at 190°C, and granulated to obtain the cable sheath compound.

[0058] Example 4

[0059] This embodiment provides a cable sheathing compound and its preparation method. The only difference between this embodiment and Embodiment 1 is that, while keeping the content of inorganic fillers unchanged, the mixture of montmorillonite and graphene in a mass ratio of 0.5:1 is completely replaced with montmorillonite. Otherwise, it is the same as Embodiment 1.

[0060] Example 5

[0061] This embodiment provides a cable sheathing compound and its preparation method. The only difference between this embodiment and Embodiment 1 is that, while keeping the content of inorganic fillers unchanged, the mixture of montmorillonite and graphene in a mass ratio of 0.5:1 is completely replaced with graphene. Otherwise, it is the same as Embodiment 1.

[0062] Example 6

[0063] This embodiment provides a cable sheathing compound and its preparation method. The only difference between this embodiment and Embodiment 1 is that, while keeping the content of inorganic fillers unchanged, the mixture of montmorillonite and graphene with a mass ratio of 0.5:1 is replaced with a mixture of montmorillonite and graphene with a mass ratio of 3:1. The rest is the same as in Embodiment 1.

[0064] Example 7

[0065] This embodiment provides a cable sheathing compound and its preparation method. The only difference between this embodiment and Embodiment 1 is that the mass fraction of the modified hydrogenated styrene-butadiene block copolymer is adjusted to 5 parts, while the rest is the same as Embodiment 1.

[0066] Example 8

[0067] This embodiment provides a cable sheathing compound and its preparation method. The only difference between this embodiment and Embodiment 1 is that, while keeping the compatibilizer content unchanged, all the ethylene-acrylate-maleic anhydride terpolymer and maleic anhydride-grafted polyethylene in a mass ratio of 0.5:2 are replaced with ethylene-acrylate-maleic anhydride terpolymer. Otherwise, the same as in Embodiment 1 is used.

[0068] Example 9

[0069] This embodiment provides a cable sheathing compound and its preparation method. The only difference between this embodiment and Embodiment 1 is that, while keeping the compatibilizer content unchanged, all the ethylene-acrylate-maleic anhydride terpolymer and maleic anhydride-grafted polyethylene with a mass ratio of 0.5:2 are replaced with maleic anhydride-grafted polyethylene. The rest is the same as in Embodiment 1.

[0070] Comparative Example 1

[0071] This comparative example provides a cable sheathing compound and its preparation method, which differs from Example 1 only in that it does not contain modified hydrogenated styrene-butadiene block copolymer, while the rest is the same as Example 1.

[0072] Comparative Example 2

[0073] This comparative example provides a cable sheathing compound and its preparation method, which differs from Example 1 only in that hydrogenated nitrile rubber is not added, while the rest is the same as Example 1.

[0074] Performance testing

[0075] The cable sheathing materials provided in the examples and comparative examples were used to make cable outer sheaths. After cross-linking by electron beam irradiation (irradiation dose of 40Mrad), the following performance tests were performed.

[0076] (1) Tensile strength and elongation at break: tested in accordance with GB / T 2951.11-2008.

[0077] (2) High temperature resistance test: The retention rate of tensile strength and the retention rate of elongation at break after treatment at 150±2℃ for 168h were tested.

[0078] (3) Tear strength: Tested in accordance with GB / T529-2008.

[0079] (4) Low temperature resistance test: The test shall be conducted in accordance with GB T 2951.14-2008. The test conditions are -40±2℃, 240h. Observe whether there are cracks in the low temperature winding test.

[0080] The test results are shown in Table 1.

[0081] Table 1

[0082]

[0083]

[0084] According to the test results in Table 1 of Examples, the cable sheathing adhesives provided in Examples 1-9 have a tensile strength of 20.9-24.3 MPa, an elongation at break of 319%-374%, a tensile strength retention rate of 95.3%-98.9% after treatment at 150±2℃ for 168 hours, an elongation at break retention rate of 94.8%-97.5%, a tear strength of 9-12 N / mm, and no cracks after low-temperature resistance testing. The performance of the cable sheathing adhesives provided in Examples 1-9 meets the requirements of CQC 1143 & PPP58049A standards.

[0085] Compared with Example 1, if the inorganic filler is only montmorillonite (Example 4), the tensile strength and tear strength decrease; if the inorganic filler is only graphene (Example 5), the tensile strength and tear strength decrease, proving that the cable sheathing compound prepared by modifying hydrogenated styrene-butadiene block copolymer with a combination of montmorillonite and graphene has better performance.

[0086] Compared with Example 1, if the mass ratio of montmorillonite to graphene is too high (Example 6), the tensile strength and tear strength decrease, proving that the cable sheathing compound prepared by modifying hydrogenated styrene-butadiene block copolymer with montmorillonite and graphene in a specific mass ratio range has better performance.

[0087] Compared with Example 1, if the mass fraction of the modified hydrogenated styrene-butadiene block copolymer is too low (Example 7), the tensile strength and tear strength decrease, proving that the cable sheathing compound prepared by using a specific mass fraction of the modified hydrogenated styrene-butadiene block copolymer has better performance.

[0088] Compared with Example 1, if only ethylene-acrylate-maleic anhydride terpolymer is used as a compatibilizer (Example 8), the tensile strength and tear strength decrease; if only maleic anhydride-grafted polyethylene is used as a compatibilizer (Example 9), the tensile strength and tear strength decrease, proving that the cable sheathing compound prepared by using ethylene-acrylate-maleic anhydride terpolymer and maleic anhydride-grafted polyethylene as compatibilizers has better performance.

[0089] Compared with Example 1, it can be seen that without the addition of modified hydrogenated styrene-butadiene block copolymer (Comparative Example 1), the tensile strength and elongation at break decrease, the tear strength decreases, and the low-temperature resistance decreases.

[0090] Compared with Example 1, it can be seen that if hydrogenated nitrile rubber (Comparative Example 2) is not added, the retention rates of tensile strength and elongation at break both decrease after treatment at 150±2℃ for 168h, and the heat resistance and tear resistance also decrease.

[0091] The applicant declares that this invention illustrates a cable sheath adhesive compound, its preparation method, and its application through the above embodiments. However, this invention is not limited to the above embodiments, meaning that this invention does not necessarily rely on the above embodiments for implementation. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection and disclosure scope of this invention.

Claims

1. A cable sheathing compound, characterized in that, The cable sheath compound comprises the following components by weight: 20-30 parts polyurethane elastomer, 40-60 parts ethylene-vinyl acetate copolymer, 10-15 parts hydrogenated nitrile rubber, 5-10 parts styrene-butadiene rubber, 10-20 parts modified hydrogenated styrene-butadiene block copolymer, 5-10 parts heat-resistant filler, 6-8 parts compatibilizer, 3-6 parts co-crosslinking agent, 32-40 parts flame retardant modifier, 0.5-2 parts anti-aging agent, 0.1-1 part antioxidant, and 0.1-1 part lubricant; Based on the total mass of inorganic filler and hydrogenated styrene-butadiene block copolymer as 100%, the modified hydrogenated styrene-butadiene block copolymer is prepared by mixing and granulating inorganic filler and hydrogenated styrene-butadiene block copolymer with a mass percentage of 30%-40%. The inorganic filler comprises montmorillonite and graphene in a mass ratio of (0.5-2):1; The compatibilizer comprises a combination of ethylene-acrylate-maleic anhydride terpolymer and maleic anhydride-grafted polyethylene in a mass ratio of (0.4-0.8):

2. The heat-resistant filler includes any one or a combination of at least two of hydrotalcite, silicon nitride, or kaolin.

2. The cable sheathing compound according to claim 1, characterized in that, The co-crosslinking agent includes any one or a combination of at least two of triallyl isocyanurate, triallyl cyanurate, or trimethylolpropane trimethacrylate.

3. The cable sheathing compound according to claim 1, characterized in that, The flame retardant modifier includes any one or a combination of at least two of the following: hydroxide flame retardants, polyphosphate flame retardants, or ammonium octamolate.

4. The cable sheathing compound according to claim 3, characterized in that, The flame retardant modifier comprises a combination of hydroxide flame retardant, polyphosphate flame retardant and ammonium octamolate, wherein the mass ratio of the hydroxide flame retardant, polyphosphate flame retardant and ammonium octamolate is (5-8):(2.5-5):

1.

5. The cable sheathing compound according to claim 1, characterized in that, The anti-aging agent includes anti-aging agent 4010NA and / or anti-aging agent RD.

6. The cable sheathing compound according to claim 1, characterized in that, The antioxidant includes any one or a combination of at least two of antioxidants 1010, 2246, 1035, 1024, or 264.

7. The cable sheathing compound according to claim 1, characterized in that, The lubricant includes any one or a combination of at least two of calcium stearate, zinc stearate, or polyethylene wax.

8. A method for preparing a cable sheath adhesive compound as described in any one of claims 1-7, characterized in that, The preparation method includes the following steps: mixing polyurethane elastomer, ethylene-vinyl acetate copolymer, hydrogenated nitrile rubber, styrene-butadiene rubber, modified hydrogenated styrene-butadiene block copolymer, heat-resistant filler, compatibilizer, crosslinking agent, flame retardant modifier, anti-aging agent, antioxidant and lubricant, and granulating to obtain the cable sheath material.

9. An energy storage cable, characterized in that, The energy storage cable includes a center conductor, a non-hygroscopic wrapping tape, an insulation layer, and a sheath layer, wherein the sheath layer is prepared by cross-linking the cable sheath rubber material as described in any one of claims 1-7 with electron beam irradiation.

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