Hydrolysis-resistant low-halogen flame-retardant insulation material for energy storage cable and preparation method thereof

Abstract

This invention provides an irradiated crosslinked, hydrolysis-resistant, low-halogen flame-retardant insulating material for energy storage cables and its preparation method, comprising the following raw material components in parts by weight: 43-51 parts of resin composition, 43-49 parts of flame-retardant composition, and 6.7-8 parts of auxiliary composition. The resin composition comprises the following components in parts by weight: 18-20 parts of ethylene-vinyl acetate copolymer; 10-12 parts of metallocene linear polyethylene; 7-9 parts of polyethylene elastomer; and 8-10 parts of POE graft compatibilizer. The flame-retardant composition comprises the following components in parts by weight: 12-14 parts of magnesium hydroxide; 21-23 parts of decabromodiphenyl ethane; and 10-12 parts of antimony trioxide. This results in a product exhibiting excellent mechanical properties, flame-retardant properties, hydrolysis resistance, long-term aging performance, and processing performance, with overall performance significantly superior to existing ordinary polyolefin insulating materials.

Description

Technical Field

[0001] This invention belongs to the field of polymer composite materials and relates to a flame-retardant insulating material, specifically to an irradiated cross-linked hydrolysis-resistant low-halogen flame-retardant insulating material for energy storage cables and its preparation method. Background Technology

[0002] With the transformation of the global energy structure and the rapid development of the power storage industry, the performance requirements for supporting cables in energy storage systems are increasing. Energy storage cables not only need to have excellent electrical insulation properties, but also need to maintain stable mechanical and physical properties and electrical safety performance under harsh environments such as high temperature, humidity, and long-term load. Especially in application scenarios such as energy storage battery pack connection and inverter output, insulation cable materials face multiple challenges such as long-term high-temperature aging, wet hydrolysis, and flame retardant safety.

[0003] Currently, commonly used insulation materials for energy storage cables are mainly polyvinyl chloride (PVC), ordinary polyolefins, or rubber. However, PVC easily releases large amounts of toxic fumes during combustion, resulting in poor environmental performance; ordinary polyolefins have low temperature resistance and insufficient long-term aging resistance, making it difficult to meet temperature requirements of 150℃ and above; while rubber materials have good flexibility, they are complex to process, costly, and generally have poor hydrolysis resistance. Furthermore, while existing materials meet the UL1581 VW-1 flame retardant rating, they often struggle to simultaneously achieve excellent hydrolysis resistance and long-term thermal aging stability.

[0004] In terms of flame retardant technology, traditional halogenated flame retardants, while highly efficient, are environmentally unfriendly; halogen-free flame retardant systems, though environmentally friendly, struggle to meet VW-1 flame retardant requirements at low addition levels and can negatively impact the material's mechanical and processing properties. Regarding hydrolysis resistance, most polyolefin materials are prone to hydrolytic degradation, electrical breakdown, or cracking in long-term humid and hot environments with water temperatures exceeding 90°C, failing to meet the long-term hydrolysis resistance requirements of energy storage cables.

[0005] Therefore, developing an insulation material for energy storage cables that combines good flame retardancy, long-term hydrolysis resistance, high-temperature aging resistance, and excellent processing performance has become a pressing technical problem to be solved in this field. Summary of the Invention

[0006] To address the aforementioned technical problems, the present invention aims to provide an irradiated cross-linked, hydrolysis-resistant, low-halogen flame-retardant insulating material for energy storage cables.

[0007] The first objective of this invention is to provide an irradiated cross-linked, hydrolysis-resistant, low-halogen flame-retardant insulating material for energy storage cables, comprising the following raw material components in parts by weight: 43-51 parts of resin composition, 43-49 parts of flame retardant composition, 6.7-8 parts of auxiliary composition, The resin composition comprises the following components in parts by weight: 18-20 parts of ethylene-vinyl acetate copolymer; 10-12 parts of metallocene linear polyethylene; 7-9 parts of polyethylene elastomer; 8-10 parts of POE graft compatibilizer; The flame retardant composition comprises the following components in parts by weight: 12-14 parts magnesium hydroxide; 21-23 parts of decabromodiphenyl ethane; 10-12 parts of antimony trioxide.

[0008] Ideally, the VA content of the ethylene-vinyl acetate copolymer is 28%, and the melt index is 3-6 g / 10min.

[0009] Furthermore, the metallocene linear polyethylene has a melt index of 3-5 g / 10min; the polyethylene elastomer is a 4C high tensile strength material with a melt index of 0.5-1.5 g / 10min.

[0010] Furthermore, the compatibilizer is a compatibilizer grafted with maleic anhydride and POE.

[0011] Ideally, the magnesium hydroxide is surface-treated magnesium hydroxide; The decabromodiphenyl ethane is a self-extinguishing type of decabromodiphenyl ethane; The content of antimony trioxide is at least 99.8%.

[0012] Optimally, the auxiliary composition comprises the following components: 1.5-2 parts lubricant; Anti-aging, antioxidant, and copper-resistant agent: 4-4.5 parts; Crosslinking agent 1.2-1.5 parts.

[0013] Furthermore, the lubricant comprises EVA wax and silicone masterbatch, in parts by weight of 0.2-0.4 parts and 1.3-1.6 parts, respectively; The anti-aging, antioxidant, and copper-resistant agent includes antioxidant 405, antioxidant 1035, antioxidant 1010, antioxidant DSTP, and copper-resistant agent 1024, with their respective mass fractions of 1.3-1.4 parts, 0.9-1 part, 0.8-0.9 parts, 0.5-0.6 parts, and 0.5-0.6 parts. The crosslinking agent is a mixture of TAIC and TMATMP, with mass fractions of 0.5-0.8 parts and 0.7 parts, respectively.

[0014] Another object of the present invention is to provide a method for preparing the above-mentioned radiation cross-linked hydrolysis-resistant low-halogen flame-retardant insulating material for energy storage cables, comprising the following steps: (a) The resin composition, the flame retardant composition and the auxiliary composition in the prescribed amounts are added to a closed internal mixer and heated and internally mixed; (b) The product after internal mixing is successively fed through a double-stage cone feeder, a twin-screw shear dischargeer, a single-screw mixing extruder, and pelletized by a pelletizer, and then collected and cooled; (c) Repeat step (b) and vacuum pack.

[0015] Ideally, in step (a), the mixing temperature is 150-160°C.

[0016] Optimally, in step (b), the double-stage cone is preheated to 120°C~140°C before feeding, the set temperature of the twin screw is 110~125°C, the set temperature of the single screw is 130~140°C, and the die head temperature is 150~160°C.

[0017] This invention relates to an irradiated cross-linked hydrolysis-resistant low-halogen flame-retardant insulation material for energy storage cables. By selecting specific components and precise proportions in the resin composition, flame-retardant composition, and auxiliary composition, the product exhibits excellent performance in mechanical properties (tensile strength after irradiation ≥13.8MPa, elongation at break ≥300%), flame-retardant properties (passes UL94 V-0 test, test thickness 1.0mm), hydrolysis resistance (>90℃×1000h), long-term aging performance (150℃×3000h), and processing performance. Its comprehensive performance is significantly superior to existing ordinary polyolefin insulation materials, meeting the high safety, high reliability, and long service life requirements of energy storage cables. Detailed Implementation

[0018] This invention relates to an irradiated crosslinked, hydrolysis-resistant, low-halogen flame-retardant insulating material for energy storage cables, comprising the following raw material components in parts by weight: 43-51 parts of resin composition, 43-49 parts of flame-retardant composition, and 6.7-8 parts of auxiliary composition. The resin composition comprises the following components in parts by weight: 18-20 parts of ethylene-vinyl acetate copolymer; 10-12 parts of metallocene linear polyethylene; 7-9 parts of polyethylene elastomer; and 8-10 parts of POE graft compatibilizer. The flame-retardant composition comprises the following components in parts by weight: 12-14 parts of magnesium hydroxide; 21-23 parts of decabromodiphenyl ethane; and 10-12 parts of antimony trioxide. By selecting specific components and precise proportions for the resin composition, flame retardant composition, and auxiliary composition, the product exhibits excellent performance in mechanical properties (tensile strength after irradiation ≥13.8MPa, elongation at break ≥300%), flame retardancy (passing UL94 V-0 test, test thickness 1.0mm), hydrolysis resistance (>90℃×1000h), long-term aging performance (150℃×3000h), and processing performance. Its overall performance is significantly superior to existing ordinary polyolefin insulation materials, meeting the high safety, high reliability, and long service life requirements of energy storage cables.

[0019] The ethylene-vinyl acetate copolymer (EVA) has a VA content of 28% and a melt index of 3-6 g / 10min (190℃×2.16kg) (preferably Formosa Plastics 7470M, Sirbon 6110M, Exxon 00328, etc., which have good mechanical and physical properties and good flowability, and excellent processing performance in wire and cable materials); the metallocene linear polyethylene (MLLDPE) has a melt index of 3-5 g / 10min (190℃×2.16kg), preferably Exxon CB3518, which has excellent mechanical and physical properties, temperature resistance, and excellent water molecule isolation properties, and good flowability, without affecting the extrusion processing performance of the material; the polyethylene elastomer is a 4C high tensile strength material with a melt index of 0.5-1.5 g / 10min (190℃×2.16kg), preferably Mitsui DF810, DOW7270, etc., which have good mechanical and physical properties and moderate flowability, without affecting the processing and use of the material. The compatibilizer is a POE and maleic anhydride grafted compatibilizer, preferably Mitsui MD715. This type of material has excellent compatibility and mechanical and physical properties, which can increase the tensile strength and filling dispersion of the material, as well as good extrusion processing performance and mechanical and physical properties.

[0020] The magnesium hydroxide is surface-treated magnesium hydroxide, such as Shendao S-6; the decabromodiphenyl ethane is a self-extinguishing type decabromodiphenyl ethane (Tianyi); the antimony trioxide content is at least 99.8% (Xiangmeng); by selecting the above components to form a flame retardant composition, the self-extinguishing performance of decabromodiphenyl ethane can be enhanced through smoke suppression, and the crusting property of the material during combustion can be increased to prevent the material from falling during combustion.

[0021] The auxiliary composition comprises the following components: 1.5-2 parts lubricant; 4-4.5 parts anti-aging, antioxidant, and copper-resistant agent; and 1.2-1.5 parts crosslinking agent. The lubricant comprises EVA wax (Jundong) and silicone masterbatch (silicone masterbatch with 50% effective content using polyethylene as a carrier), with mass fractions of 0.2-0.4 parts and 1.3-1.6 parts, respectively; the anti-aging, antioxidant, and copper-resistant agent comprises antioxidant 405, antioxidant 1035, antioxidant 1010, antioxidant DSTP, and copper-resistant agent 1024, with mass fractions of 1.3-1.4 parts, 0.9-1 part, 0.8-0.9 parts, 0.5-0.6 parts, and 0.5-0.6 parts, respectively; and the crosslinking agent is a mixture of TAIC and TMATMP, with mass fractions of 0.5-0.8 parts and 0.7 parts, respectively.

[0022] The preparation method of the above-mentioned irradiated crosslinked hydrolysis-resistant low-halogen flame-retardant insulation material for energy storage cables includes the following steps: (a) adding the resin composition, the flame-retardant composition and the auxiliary composition in the prescribed amounts to a closed internal mixer for heating and internal mixing; (b) sequentially passing the product after internal mixing through a double-stage cone feeder, a twin-screw shear discharger, a single-screw mixing extruder, and a pelletizer, followed by collection and cooling; (c) repeating step (b) and vacuum packaging.

[0023] In step (a), the mixing temperature is 150-160℃. In step (b), the double-stage cone is preheated to 120℃~140℃ before feeding, the set temperature of the twin screw is 110~125℃, the set temperature of the single screw is 130~140℃, and the die head temperature is 150~160℃.

[0024] This invention relates to an irradiated cross-linked hydrolysis-resistant low-halogen flame-retardant insulation material for energy storage cables. By selecting specific components and precise proportions in the resin composition, flame-retardant composition, and auxiliary composition, the product exhibits excellent performance in mechanical properties (tensile strength after irradiation ≥13.8MPa, elongation at break ≥300%), flame-retardant properties (passes UL94 V-0 test, test thickness 1.0mm), hydrolysis resistance (>90℃×1000h), long-term aging performance (150℃×3000h), and processing performance. Its comprehensive performance is significantly superior to existing ordinary polyolefin insulation materials, meeting the high safety, high reliability, and long service life requirements of energy storage cables.

[0025] The present invention will be further described below with reference to the embodiments shown.

[0026] Examples 1-3, Comparative Examples 1-21 Examples 1-3 and Comparative Examples 1-21 each provide an irradiated cross-linked hydrolysis-resistant low-halogen flame-retardant insulating material for energy storage cables, the specific composition of which is shown in Table 1.

[0027] Table 1. Composition of Irradiation Crosslinking-Resistant Hydrolysis-Resistant Low-Halogen Flame-Retardant Insulating Materials for Energy Storage Cables in Examples 1-3 and Comparative Examples 1-21

[0028]

[0029]

[0030] Note: In Examples 1, 2, and 3, the EVA used was Formosa Plastics 7470M, the MLLDPE used was Exxon 3518CB, the POE used was Mitsui DF810, the compatibilizer used was Mitsui MD715, the magnesium hydroxide used was Shinjima S-6, the decabromodiphenyl ethane used was Tianyi decabromodiphenyl ethane, the antimony trioxide used was Xiangmeng 99.8% antimony trioxide, the lubricant used was Maitai PE carrier 50% silicone masterbatch and Jundong EVA wax, the anti-aging agents used were Shanghai Dirui 405 and 1035, the antioxidants used were Jiyi antioxidant 1010 and DSTP, the copper inhibitor used was Jiyi copper inhibitor 1024, the crosslinking agent TAIC used was Fangruida TAIC, and the crosslinking agent TMATMP used was Dunmei M1010. The only differences in material selection between the comparative examples and the embodiments are: the EVA used in comparative example 3 is 18J3 18VA, linear low-density polyethylene (LLDPE, FB2230) is used instead of MLLDPE in comparative example 6, POE is 8C POE8150 in comparative example 9, the compatibilizer in comparative example 12 is LDPE graft compatibilizer with brand name YS-201, and the magnesium hydroxide in comparative example 15 is ordinary physical magnesium with brand name Ruilong physical magnesium LD35Z.

[0031] The preparation method of the above-mentioned radiation cross-linked hydrolysis-resistant low-halogen flame-retardant insulation material for energy storage cables is as follows: (a) Add the raw materials in the formula amount to a closed internal mixer and heat and mix them at a temperature of 150-160℃ (this temperature range has little impact on the performance of the product, the same below). (b) The product after internal mixing is fed sequentially through a double-stage cone feeder (preheating temperature 130℃), a twin-screw shear dischargeer (set temperature 110-125℃, L-shaped elbow added to the discharge port), a single-screw mixing extrusioner (set temperature 135℃, die head temperature 155℃, 150 mesh filter screen used for baffles), and pelletized by a pelletizer (particle size 3×3mm). Then the material is collected (collected by a blower and a collection hopper) and cooled (vibrating screen length 5.5m, blower power 2.5 kW). (c) Repeat step (b) and vacuum pack.

[0032] The performance of the irradiated cross-linked hydrolysis-resistant low-halogen flame-retardant insulation materials for energy storage cables in Examples 1-3 and Comparative Examples 1-21 was tested, and the results are listed in Table 2.

[0033] Table 2 Performance of Irradiated Crosslinked Hydrolysis-Resistant Low-Halogen Flame-Retardant Insulating Materials for Energy Storage Cables in Examples 1-3 and Comparative Examples 1-21 density Tensile strength before irradiation Elongation at break before irradiation Intensity after irradiation Elongation after irradiation Aging test Flame retardant material Threading Cable surface Flame retardant cables Cable hydrolysis resistance Long-term aging test of cables Test Standards GB / T3850 UL758 UL758 UL758 UL758 UL758 (180℃*168h) UL94V-0, sample thickness 1.5mm --- ---- UL758 Water temperature > 90℃ * 1000h ISO 19642, 150℃*3000h Require ≤1.40g / cm3 ≥10.5MPa ≥330% ≥13.79% ≥300% Strength / elongation retention ≥ 80% pass Manufacturing UL4339, 24AWG dual parallel line Smooth surface, free of impurities, and with stable extrusion wire diameter. Meets UL1581, VW-1 flame retardancy test requirements After hydrolysis resistance, the 3kV voltage test was passed. After aging, the winding rod did not crack, and it did not break down under a test voltage of 2kV. Example 1 1.37 11.35 372 14.75 323 qualified qualified qualified qualified qualified qualified qualified Example 2 1.38 11.77 391 15.12 338 qualified qualified qualified qualified qualified qualified qualified Example 3 1.38 11.22 390 14.89 327 qualified qualified qualified qualified qualified qualified qualified Comparative Example 1 1.41 10.33 311 13.06 287 Elongation retention rate: 77% qualified ---- ---- ---- ---- ---- Comparative Example 2 1.33 11.05 434 15.15 335 qualified Long self-extinguishing time qualified qualified There is dripping, which is unacceptable. ---- ---- Comparative Example 3 1.38 12.15 331 15.16 293 Elongation retention rate: 74% qualified qualified qualified qualified qualified cracking Comparative Example 4 1.41 9.85 321 12.15 301 Elongation retention rate: 72% qualified ---- ---- ---- ---- ---- Comparative Example 5 1.34 13.23 377 16.15 327 qualified Long self-extinguishing time qualified qualified There is a dripping ignition ---- ---- Comparative Example 6 1.38 11.75 371 14.35 332 Elongation retention rate: 78% qualified qualified qualified qualified Breakdown occurred at 500h cracking Comparative Example 7 1.40 10.45 287 13.55 256 Elongation retention rate: 75% qualified ---- ---- ---- ---- ---- Comparative Example 8 1.34 12.25 412 15.43 361 Elongation retention rate: 73% Long self-extinguishing time qualified qualified There is a dripping ignition ---- ---- Comparative Example 9 1.38 10.35 432 13.45 403 qualified qualified qualified qualified qualified Breakdown occurred at 400h qualified Comparative Example 10 1.41 9.85 271 11.33 236 Elongation retention rate: 64% There is a phenomenon of not self-extinguishing. ---- ---- ---- ---- ---- Comparative Example 11 1.35 12.11 417 16.60 387 qualified Long self-extinguishing time qualified qualified There is a dripping ignition ---- ---- Comparative Example 12 1.37 12.35 337 15.25 293 Elongation retention rate: 70% qualified qualified qualified qualified Breakdown occurred at 500h cracking Comparative Example 13 1.35 11.25 435 15.50 401 qualified There is dripping qualified qualified There is a dripping ignition ---- ---- Comparative Example 14 1.41 10.35 305 13.55 277 qualified qualified ---- ---- ---- ---- ---- Comparative Example 15 1.40 9.85 403 11.75 381 Elongation retention rate: 62% There is a low-level ignition ---- ---- ---- ---- ---- Comparative Example 16 1.32 12.56 422 15.89 393 qualified Non-self-extinguishing qualified qualified Ignite the flag ---- ---- Comparative Example 17 1.45 10.35 345 13.44 309 qualified qualified qualified qualified qualified Breakdown occurred at 200h cracking Comparative Example 18 1.34 11.35 391 14.77 325 qualified Long self-extinguishing time qualified qualified There is a dripping ignition ---- --- Comparison Example 19 1.44 10.95 348 13.61 312 qualified qualified qualified qualified qualified Breakdown occurred at 200h cracking Comparison Example 20 1.38 11.52 384 15.15 339 Elongation retention rate: 61% qualified qualified qualified qualified 800h showed a breakdown cracking Comparative Example 21 1.37 11.11 369 14.71 320 qualified qualified Large variation in extrusion wire diameter Surface rough ---- --- ---- Note: ---- This is because the previous test failed, so subsequent tests were not conducted.

[0034] In Comparative Examples 1-12: 1. The effect of EVA addition ratio and different types of EVA on the materials: Small addition amounts result in poor basic material properties; excessive addition amounts decrease flame retardancy; different types of EVA (such as the petrochemical-grade 18J3 18VA content EVA selected in Comparative Example 3) have a significant impact on the material's temperature resistance. 2. The effect of MLLDPE addition ratio and different types of LLDPE on the materials: Small addition amounts worsen the mechanical properties and temperature resistance of the materials; excessive addition amounts worsen the flame retardancy; different types of LLDPE (such as Nordic Bimodal LLDPE FB2230) lead to poorer temperature resistance and hydrolysis resistance. 3. The effect of POE addition ratio and different types of POE on the materials: Small addition amounts worsen the elongation and temperature resistance of the materials; large addition amounts worsen the flame retardancy; different types of POE (such as Dow PEO selected in the comparative examples) have a significant impact on the material's temperature resistance and hydrolysis resistance. 8150) has a significant impact on the mechanical properties, temperature resistance, and hydrolysis resistance of the material; 4. The effect of compatibilizer addition ratio and different types of compatibilizer on the material: a small addition ratio leads to poor material dispersion, which in turn reduces the overall performance of the material; a large addition ratio leads to poorer flame retardancy of the material; different types of compatibilizer (such as YS-201 from Suyan, which was selected in the comparative experiment) have a significant impact on the temperature resistance and hydrolysis resistance of the material.

[0035] In Comparative Examples 13-19: 1. The effect of the addition ratio of magnesium hydroxide and different types of magnesium hydroxide on the materials: a small addition ratio worsens the flame retardancy of the materials, while a large addition ratio worsens the mechanical properties and temperature resistance of the materials. Different types of magnesium hydroxide (Ruilong's physical magnesium LD35Z was used in the comparative examples) reduce the flame retardancy, temperature resistance, and water resistance of the materials. 2. The effect of the addition ratio of decabromodiphenyl ethane on the materials: a small addition ratio worsens the flame retardancy and self-extinguishing properties of the materials, while a large addition ratio worsens the mechanical properties, temperature resistance, and water resistance of the materials. 3. The effect of the addition ratio of antimony trioxide on the materials: a small addition ratio worsens the flame retardancy and crusting properties of the materials, while a large addition ratio worsens the temperature resistance, mechanical and physical properties, and water resistance of the materials.

[0036] In Comparative Examples 20-21: 1. Effect of lubricant addition ratio on the material: Insufficient lubricant addition leads to poor extrusion processing performance of the material; 2. Effect of anti-aging, anti-oxidation and anti-copper agent addition on the material: Insufficient addition ratio leads to poor temperature resistance of the material.

[0037] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An irradiated cross-linked, hydrolysis-resistant, low-halogen flame-retardant insulating material for energy storage cables, characterized in that, The raw material components include the following parts by weight: 43-51 parts of resin composition, 43-49 parts of flame retardant composition, 6.7-8 parts of auxiliary composition, The resin composition comprises the following components in parts by weight: 18-20 parts of ethylene-vinyl acetate copolymer; 10-12 parts of metallocene linear polyethylene; 7-9 parts of polyethylene elastomer; 8-10 parts of POE graft compatibilizer; The flame retardant composition comprises the following components in parts by weight: 12-14 parts magnesium hydroxide; 21-23 parts of decabromodiphenyl ethane; 10-12 parts of antimony trioxide.

2. The irradiated cross-linked hydrolysis-resistant low-halogen flame-retardant insulating material for energy storage cables according to claim 1, characterized in that: The VA content of the ethylene-vinyl acetate copolymer is 28%, and the melt index is 3-6 g / 10min.

3. The irradiated cross-linked hydrolysis-resistant low-halogen flame-retardant insulating material for energy storage cables according to claim 2, characterized in that: The metallocene linear polyethylene has a melt index of 3-5 g / 10min; the polyethylene elastomer is a 4C high tensile strength material with a melt index of 0.5-1.5 g / 10min.

4. The irradiated cross-linked hydrolysis-resistant low-halogen flame-retardant insulating material for energy storage cables according to claim 3, characterized in that: The compatibilizer is a compatibilizer grafted with POE and maleic anhydride.

5. The irradiated cross-linked hydrolysis-resistant low-halogen flame-retardant insulating material for energy storage cables according to claim 1, characterized in that: The magnesium hydroxide is surface-treated magnesium hydroxide; The decabromodiphenyl ethane is a self-extinguishing type of decabromodiphenyl ethane; The content of antimony trioxide is at least 99.8%.

6. The irradiated cross-linked hydrolysis-resistant low-halogen flame-retardant insulating material for energy storage cables according to claim 1, characterized in that, The auxiliary composition comprises the following components: 1.5-2 parts lubricant; Anti-aging, antioxidant, and copper-resistant agent: 4-4.5 parts; Crosslinking agent 1.2-1.5 parts.

7. The irradiated cross-linked hydrolysis-resistant low-halogen flame-retardant insulating material for energy storage cables according to claim 6, characterized in that, The lubricant comprises EVA wax and silicone masterbatch, in parts by weight of 0.2-0.4 parts and 1.3-1.6 parts, respectively; The anti-aging, antioxidant, and copper-resistant agent includes antioxidant 405, antioxidant 1035, antioxidant 1010, antioxidant DSTP, and copper-resistant agent 1024, with their respective mass fractions of 1.3-1.4 parts, 0.9-1 part, 0.8-0.9 parts, 0.5-0.6 parts, and 0.5-0.6 parts. The crosslinking agent is a mixture of TAIC and TMATMP, with mass fractions of 0.5-0.8 parts and 0.7 parts, respectively.

8. A method for preparing the irradiated cross-linked, hydrolysis-resistant, low-halogen flame-retardant insulating material for energy storage cables according to any one of claims 1 to 7, characterized in that, Includes the following steps: (a) The resin composition, the flame retardant composition, and the auxiliary composition in the prescribed amounts are added to a closed internal mixer and heated and internally mixed; (b) The product after internal mixing is successively fed through a double-stage cone feeder, a twin-screw shear discharger, a single-screw mixing extruder, and pelletized by a pelletizer, and then collected and cooled; (c) Repeat step (b) and vacuum pack.

9. The preparation method of the irradiated cross-linked hydrolysis-resistant low-halogen flame-retardant insulating material for energy storage cables according to claim 8, characterized in that: In step (a), the mixing temperature is 150-160℃.

10. The method for preparing the irradiated cross-linked hydrolysis-resistant low-halogen flame-retardant insulating material for energy storage cables according to claim 8, characterized in that: In step (b), the double-stage cone is preheated to 120°C~140°C before feeding, the twin screw is set to 110~125°C, the single screw is set to 130~140°C, and the die head temperature is 150~160°C.

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