Bending-resistant flexible new energy cable material and preparation method thereof

Abstract

The application discloses a flexible new energy cable material resistant to bending and a preparation method thereof, and belongs to the technical field of cable material preparation, and is used for solving the technical problem that the flexibility and aging resistance of the cable material in the prior art need to be further improved; the flexible new energy cable material is prepared by the following steps: cooperatively compounding a flexible siloxane polyurethane elastomer, a compatible elastomer and modified silica gel particles to obtain an outer sheath preparation material, and extruding and coating the outer sheath preparation material on the surface of a core body to form an outer sheath layer, so that the flexible new energy cable material is obtained; the scheme is favorable for improving the compatibility and stress transmission continuity of the outer sheath layer system, enhancing the structure maintaining capacity under the action of heat, and improving the comprehensive use stability of the obtained flexible new energy cable under complex deformation conditions.

Description

Technical Field

[0001] This invention relates to the field of cable material preparation technology, specifically to a flexible new energy cable material with bend resistance and its preparation method. Background Technology

[0002] With the continuous development of new energy vehicles, battery systems, energy storage devices, and supporting wiring harnesses, flexible new energy cables are widely used in high-voltage cable sheaths, insulation layers, and flexible connection parts. The outer sheath or insulation layer of conventional cables usually includes polyvinyl chloride, cross-linked polyethylene, thermoplastic polyurethane, ethylene-vinyl acetate copolymer, and their blended modified systems. There are also technical routes that use inorganic fillers, flame retardant components, toughening components, and compatibilizers to meet the application requirements of flexible new energy cables in terms of flexibility, heat resistance, processing adaptability, and long-term service stability. Different systems have differences in structural composition, phase characteristics, and interface states, which lead to their respective performance characteristics and applicable scenarios.

[0003] Currently, in practical applications, flexible new energy cables often face the challenge of balancing flexibility and structural stability. While some cable outer sheaths can achieve good initial flexibility and processing fluidity, under continuous bending, torsion, or complex stress conditions, insufficient coordination of internal chain segments within the outer sheath can easily lead to localized stress concentrations, resulting in discontinuous force transmission. This, in turn, affects the deformation retention and structural integrity of flexible new energy cables during long-term use. In particular, for composite outer sheath systems containing multiple polymer or filler components, insufficient interfacial bonding and limited compatibility between different phase regions can easily lead to uneven dispersion and loosening of interfaces, thus limiting the overall stability of flexible new energy cables under dynamic usage conditions.

[0004] Furthermore, some flexible new energy cables suffer from insufficient structural retention under thermal conditions. The organic matrix, fillers, and functional additives in some outer sheath systems lack stable and effective interfacial interactions, leading to increased chain segment relaxation, phase region changes, or weakened interfacial bonding after heating. This affects the overall reliability of the cable. Simultaneously, conventional inorganic fillers, if lacking sufficient surface activity or exhibiting significant polarity differences with the organic matrix, are prone to agglomeration within the system, hindering their ability to fully stabilize and support the outer sheath matrix and potentially exacerbating the formation of localized defect areas. Therefore, improving the compatibility, interfacial stability, and structural coordination under thermal conditions of the flexible new energy cable outer sheath system has become a crucial technical challenge in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a flexible new energy cable material that is resistant to bending and a method for preparing the same, in order to solve the technical problem that the flexibility and aging resistance of existing cable materials need to be further improved.

[0006] The objective of this invention can be achieved through the following technical solution: a flexible new energy cable material resistant to bending, comprising a core and an outer sheath layer, wherein the outer sheath layer is obtained by melting and extruding an outer sheath pre-material onto the surface of the core;

[0007] The outer sheath preparation material is a composite material containing a sheath matrix premix and modified silicone particles;

[0008] The sheath matrix premix is ​​a premix composed of flexible siloxane polyurethane elastomer, compatible elastomer, antioxidant 1010, antioxidant 168 and ethylene bis-stearamide.

[0009] The modified silica particles are silicon-oxygen network particles with a polydopamine layer and a boron-containing linkage structure on their surface.

[0010] The flexible siloxane polyurethane elastomer is a siloxane-containing polyurethane elastomer constructed from siloxane polyols.

[0011] The compatible elastomer is a composite elastomer containing ethylene-vinyl acetate copolymer segments, ion-associative structures, and inter-chain linkage structures.

[0012] Furthermore, the preparation method of the sheath matrix premix is ​​as follows: Weigh 50-60 parts of flexible siloxane polyurethane elastomer by weight and add it to a mixer for heating and plasticizing. Then, add 8-10 parts of compatible elastomer, 0.2-0.3 parts of antioxidant 1010, 0.2-0.3 parts of antioxidant 168 and 0.2-0.3 parts of ethylene bis-stearamide in sequence. After mixing evenly, mix at 125-135℃ for 6-8 minutes. After post-treatment, the sheath matrix premix is ​​obtained.

[0013] Further post-processing includes: after the mixing is completed, the material is compressed into tablets and cooled, and then crushed into 3-5mm particles to obtain a sheath matrix premix.

[0014] Furthermore, the preparation method of the outer sheath premix is ​​as follows: weigh 50-60 parts by weight of sheath matrix premix and add it to a twin-screw extruder for melting. After the melt stabilizes, add 2-3 parts of modified silicone particles, control the temperature of each zone to 135-150℃, keep it at the temperature for 2-4 minutes, and then extrude. After post-processing, the outer sheath premix is ​​obtained.

[0015] Further post-processing includes: the extruder strip is cooled in a cooling water tank and then granulated to a particle size of 3-5 mm. The granules are then placed in a drying oven at 50-55℃ and dried with hot air for 2-3 hours to obtain the outer sheath preparation material.

[0016] Furthermore, the modified silica gel particles are prepared by adding anhydrous ethanol, deionized water and 25-28 wt% ammonia water into a reaction vessel and stirring. After mixing evenly, dopamine hydrochloride and boric acid are added and stirred evenly. Then, tetraethyl orthosilicate is added dropwise. After the addition is complete, the reaction vessel is heated to 30-35°C and kept at this temperature for 5-7 hours. The modified silica gel particles are then obtained through post-treatment.

[0017] Furthermore, the ratio of anhydrous ethanol, deionized water, 25-28wt% ammonia, dopamine hydrochloride, boric acid, and tetraethyl orthosilicate is 120mL:20-24mL:6-8mL:4-5g:2-3g:20mL, and the addition time of tetraethyl orthosilicate is 30-40min. The post-treatment includes: after the reaction is completed, filtering and collecting the solid, washing the solid with anhydrous ethanol and deionized water 2-3 times each, then placing it in a drying oven at 60℃ for vacuum drying for 8-10h, and then keeping it at 75-85℃ for 1-2h to obtain modified silica gel particles.

[0018] Furthermore, the flexible siloxane polyurethane elastomer is prepared by the following method:

[0019] A1. Toluene and polymethylhydrosiloxane were added to a reaction vessel and stirred until homogeneous. Chloroplatinic acid hexahydrate was then added, followed by the dropwise addition of allyl glycidyl ether over 25-35 minutes. After the addition was complete, the reaction vessel was heated to 75-85°C and stirred for 2-4 hours. Then, 2,5-furandiethanol and tetrabutylammonium bromide were added, and the temperature was further increased to 95-105°C and stirred for 4-6 hours. After the reaction was completed, the pressure was reduced and the mixture was distilled until no liquid was collected to obtain siloxane polyol.

[0020] A2. Add siloxane polyol and polytetrahydrofuran ether diol to a reaction vessel and stir. After mixing evenly, evacuate and heat to 90-100℃ for dehydration for 1-2 hours. Then, introduce nitrogen gas and cool to 70-75℃. Add isophorone diisocyanate and dibutyltin dilaurate. Heat the reaction vessel to 75-85℃ and stir for 1.5-2.5 hours. Then, add 1,4-butanediol and continue to heat to 85-90℃ and stir for 1-2 hours. After the reaction is complete, reduce the pressure and distill until no liquid is collected to obtain flexible siloxane polyurethane elastomer.

[0021] Furthermore, in step A1, the ratio of toluene, polymethylhydrosiloxane, chloroplatinic acid hexahydrate, allyl glycidyl ether, 2,5-furandiethanol and tetrabutylammonium bromide is 15mL:20-25mL:0.01g:5-6mL:3-4g:0.1g;

[0022] Furthermore, in step A2, the ratio of the amount of siloxane polyol, polytetrahydrofuran ether diol, isophorone diisocyanate, dibutyltin dilaurate, and 1,4-butanediol is 10-15g:36-42g:6-8mL:0.03mL:1-2mL.

[0023] Furthermore, the method for preparing the compatible elastomer is as follows: after adding ethylene-vinyl acetate copolymer to a reactive extruder for melt plasticization, zinc methacrylate, triallyl isocyanurate and dicumyl peroxide are added sequentially, and after mixing evenly, the temperature of each zone is controlled at 150-160℃, and after holding at the temperature for 2-4 minutes, it is extruded, and the compatible elastomer is obtained after post-treatment.

[0024] Further, the post-processing includes: the ratio of the ethylene-vinyl acetate copolymer, zinc methacrylate, triallyl isocyanurate, and dicumyl peroxide is 50-60g:3-4g:0.4-0.6mL:0.2-0.3g, the pellet size is 3-5mm, and the post-processing includes: the extruder is cooled in a cooling water tank and then pelletized, and the pellets are placed in a drying oven at 50-55℃ for hot air drying for 2-3h to obtain a compatible elastomer.

[0025] The present invention also discloses a method for preparing a flexible new energy cable material that is resistant to bending, comprising the following steps: drying the outer sheath material in a 50°C hot air drying oven for 2 hours, then extruding it in a single screw extruder to coat the core surface, and finally processing it to obtain the flexible new energy cable material.

[0026] Furthermore, the core is formed by two insulated wire cores arranged side by side. The conductor of each insulated wire core is formed by twisting together several annealed copper monofilaments with a diameter of 0.25 mm, and the cross-sectional area of ​​a single conductor is 1.47 mm². 2 Each insulated wire core has an outer diameter of 3.4mm;

[0027] Furthermore, the coating thickness is 1.0 mm;

[0028] Furthermore, the single-screw extruder has a screw diameter of 25mm, a length-to-diameter ratio of 25:1, and a screw speed of 18r / min; the extruder zone 1 temperature is 125℃, zone 2 temperature is 130℃, zone 3 temperature is 135℃, and the die head temperature is 135℃.

[0029] Further post-processing includes: cooling with 25°C cooling water, pulling, and winding the cable, then placing it in an environment of 23°C and 50% relative humidity for 24 hours to obtain flexible new energy cable material.

[0030] The present invention has the following beneficial effects:

[0031] 1. The compatible elastomer prepared by this invention is disposed between the flexible siloxane polyurethane elastomer and the modified silicone particles, so that the outer sheath layer system forms a relatively continuous stress structure after molding. When the flexible new energy cable is subjected to tensile load, the connection area corresponding to the compatible elastomer can maintain the coordinated deformation between different organic phases and avoid premature discontinuous response at the interface. The flexible siloxane polyurethane elastomer reserves the necessary space for chain segment orientation and deformation transmission, so that the outer sheath layer maintains a relatively gentle deformation rhythm during continuous stress. After the modified silicone particles are dispersed in the matrix, they constrain the local stress area and reduce the amplification tendency of small defects during the tensile process. As a result, the outer sheath layer system exhibits a relatively coordinated response characteristic in both load-bearing and extension directions, and maintains good continuity between the stress path, interface state and overall deformation.

[0032] 2. When the flexible siloxane polyurethane elastomer prepared in this invention is introduced as a continuous flexible phase, the outer sheath of the flexible new energy cable has low deformation resistance in the initial state. When external bending displacement is applied, the outer sheath can move smoothly and is not prone to forming prominent local reaction forces under small curvature. After entering the repeated bending condition, the compatible elastomer keeps the relative movement between the components within a coordinated range, and the cyclic load is not prone to rapidly evolve into phase separation or local slip accumulation. The modified silicone particles are distributed in the continuous bending area, which plays a role in dispersing and slowing down the stress concentration under high-frequency repeated action. Therefore, while the flexible new energy cable compliantly follows the external displacement, the internal structure of its outer sheath does not show obvious loosening tendency associated with softening. The state transition during bending is relatively stable, and it can still maintain complete deformation response during continuous operation.

[0033] 3. The modified silica particles prepared in this invention, when incorporated into the organic matrix of the outer sheath, enable the flexible new energy cable to possess relatively stable local skeleton units under thermal exposure conditions. When the outer sheath system undergoes continuous heating, significant interfacial loosening does not easily occur in the area surrounding the particles, and structural changes are more gradual rather than abrupt. The siloxane segments in the flexible siloxane polyurethane elastomer maintain the necessary compliance background of the matrix during this process, preventing the heated outer sheath from transitioning to a brittle response too quickly. The compatible elastomer maintains good coordination in the arrangement of each phase after thermal history, reducing secondary effects caused by phase imbalance. Based on the above configuration, the flexible new energy cable exhibits a relatively continuous structural relationship before and after thermal aging, and the heating process does not significantly change its overall stress mode. The performance characteristics after aging remain within a relatively stable system trajectory. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a SEM image of the compatible elastomer prepared in Example 6 of the present invention. Detailed Implementation

[0036] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In this application, antioxidant 1010 was purchased from Shanghai Maclean Biochemical Technology Co., Ltd., with item number P750268; antioxidant 168 was purchased from Shanghai Maclean Biochemical Technology Co., Ltd., with item number T822863; polymethylhydrosiloxane was purchased from Shanghai Maclean Biochemical Technology Co., Ltd., with item number P750098; and ethylene-vinyl acetate copolymer was purchased from Shanghai Maclean Biochemical Technology Co., Ltd., with item number P815474.

[0038] Example 1

[0039] This embodiment provides a method for preparing a flexible siloxane polyurethane elastomer, including the following steps:

[0040] Step I: Preparation of siloxane polyols

[0041] Weigh out 15.0 mL of toluene and 20.0 mL of polymethylhydrosiloxane and add them to the reaction vessel. Stir and mix thoroughly. Then add 0.01 g of chloroplatinic acid hexahydrate, followed by 5.0 mL of allyl glycidyl ether. The addition time is 25 min. After the addition is completed, heat the reaction vessel to 75 °C and stir for 2 h. Then add 3.0 g of 2,5-furandiethanol and 0.1 g of tetrabutylammonium bromide. Continue to heat to 95 °C and stir for 4 h. After the reaction is completed, reduce the pressure and distill until no liquid is collected to obtain siloxane polyol.

[0042] Step II: Preparation of flexible siloxane polyurethane elastomer

[0043] Weigh 10.0g of siloxane polyol and polytetrahydrofuran ether diol and add them to the reaction vessel. Stir and mix evenly. Then, evacuate and heat to 90℃ for 1 hour to dehydrate. Then, introduce nitrogen and cool to 70℃. Then, add 6.0mL of isophorone diisocyanate and 0.03mL of dibutyltin dilaurate. Then, heat the reaction vessel to 75℃ and stir for 1.5 hours. Then, add 1.0mL of 1,4-butanediol and continue to heat to 85℃ and stir for 1 hour. After the reaction is completed, reduce the pressure and distill until no liquid is collected to obtain flexible siloxane polyurethane elastomer.

[0044] The reaction principle for preparing flexible siloxane polyurethane elastomers is as follows:

[0045] The isocyanate group in the isophorone diisocyanate molecule undergoes nucleophilic addition with the hydroxyl groups in the siloxane polyol, polytetrahydrofuran ether diol, and 1,4-butanediol molecules to form urethane bonds, thereby constructing the polyurethane molecular backbone. The siloxane polyol, as a dihydroxyl component containing Si-O-Si linkages, is introduced into the polymerization system, allowing the siloxane structural units to be covalently embedded into the polyurethane backbone. Subsequently, polytetrahydrofuran ether diol, as a linear polyether diol, participates in the chain segment composition; 1,4-butanediol, as a small molecule diol, participates in the molecular chain connection; and dibutyltin dilaurate catalyzes the addition reaction between the isocyanate group and the hydroxyl group, enabling the system to form a polyurethane elastomer structure containing siloxane segments according to a stepwise polyaddition mechanism.

[0046] The mechanism of action of flexible siloxane polyurethane elastomers in flexible new energy cable materials is as follows:

[0047] In this process, the siloxane polyol obtained in step I provides the system with a structure containing Si-O-Si segments and hydroxyl reaction sites. It is not simply incorporated into the system as a free siloxane, but is embedded in the polyurethane backbone as a reactive flexible segment. This introduces high segmental flexibility, conformational regulation capability and structural stability under thermal effects into the material matrix. The oxygen-containing heterocyclic structure contained therein also regulates the polarity level and interchain interaction relationship of the silicon-containing segments to a certain extent, so that the flexible component can form a relatively coordinated interaction with other polar structures in the system while maintaining its mobility.

[0048] The flexible siloxane polyurethane elastomer obtained in step II further integrates the flexible segments, continuous soft segments, load-bearing hard segments, and chain extension structures corresponding to siloxane polyol, polytetrahydrofuran ether diol, isophorone diisocyanate, and 1,4-butanediol into the same elastomer system. Among them, polytetrahydrofuran ether diol helps to form a continuous flexible phase, while the urethane hard segments formed by isophorone diisocyanate and 1,4-butanediol provide the system with necessary cohesion, stress support, and structural constraints, enabling the material to maintain a relatively continuous stress transmission path under large deformation conditions. Although dibutyltin dilaurate does not constitute the final main structure, it helps to improve the integrity and consistency of the chain segment connection.

[0049] Based on the above structural configuration, the obtained flexible siloxane polyurethane elastomer serves as the basic elastomer phase for subsequent flexible new energy cable materials. It can jointly influence the tensile response, elongation behavior, hardness balance, and structural stability of the final material in terms of matrix continuity, chain segment coordination, and post-thermal structural retention.

[0050] Example 2

[0051] This embodiment provides a method for preparing a flexible siloxane polyurethane elastomer, including the following steps:

[0052] Step I: Preparation of siloxane polyols

[0053] Weigh out 15.0 mL of toluene and 25.0 mL of polymethylhydrosiloxane and add them to the reaction vessel. Stir and mix thoroughly. Then add 0.01 g of chloroplatinic acid hexahydrate, followed by 6.0 mL of allyl glycidyl ether. The addition time is 35 min. After the addition is completed, heat the reaction vessel to 85 °C and keep it at this temperature for 4 h. Then add 4.0 g of 2,5-furandiethanol and 0.1 g of tetrabutylammonium bromide. Continue to heat to 105 °C and keep it at this temperature for 6 h. After the reaction is completed, reduce the pressure and distill until no liquid is collected to obtain siloxane polyol.

[0054] Step II: Preparation of flexible siloxane polyurethane elastomer

[0055] Weigh 15.0g of siloxane polyol and polytetrahydrofuran ether diol and add them to the reaction vessel. Stir and mix evenly. Then, evacuate and heat to 100℃ for 2 hours to dehydrate. Then, introduce nitrogen and cool to 75℃. Then, add 8.0mL of isophorone diisocyanate and 0.03mL of dibutyltin dilaurate. Then, heat the reaction vessel to 85℃ and stir for 2.5 hours. Then, add 2.0mL of 1,4-butanediol and continue to heat to 90℃ and stir for 2 hours. After the reaction is completed, reduce the pressure and distill until no liquid is collected to obtain flexible siloxane polyurethane elastomer.

[0056] Example 3

[0057] This embodiment provides a method for preparing a flexible siloxane polyurethane elastomer, including the following steps:

[0058] Step I: Preparation of siloxane polyols

[0059] Weigh out 15.0 mL of toluene and 22.5 mL of polymethylhydrosiloxane and add them to the reaction vessel. Stir and mix thoroughly. Then add 0.01 g of chloroplatinic acid hexahydrate, followed by 5.5 mL of allyl glycidyl ether. The addition time is 30 min. After the addition is completed, heat the reaction vessel to 80 °C and stir for 3 h. Then add 3.5 g of 2,5-furandiethanol and 0.1 g of tetrabutylammonium bromide. Continue to heat to 100 °C and stir for 5 h. After the reaction is completed, reduce the pressure and distill until no liquid is collected to obtain siloxane polyol.

[0060] Step II: Preparation of flexible siloxane polyurethane elastomer

[0061] Weigh 12.5g of siloxane polyol and polytetrahydrofuran ether diol and add them to the reaction vessel. Stir and mix evenly. Then, evacuate and heat to 95℃ for 2 hours to dehydrate. Then, introduce nitrogen and cool to 73℃. Then, add 7.0mL of isophorone diisocyanate and 0.03mL of dibutyltin dilaurate. Then, heat the reaction vessel to 80℃ and stir for 2.0 hours. Then, add 1.5mL of 1,4-butanediol and continue to heat to 88℃ and stir for 2 hours. After the reaction is completed, reduce the pressure and distill until no liquid is collected to obtain flexible siloxane polyurethane elastomer.

[0062] Example 4

[0063] This embodiment provides a method for preparing a flexible new energy cable material that is resistant to bending, including the following steps:

[0064] Step 1: Preparation of Compatible Elastomer

[0065] Weigh out 50.0g of ethylene-vinyl acetate copolymer and add it to the reactive extruder for melt plasticization. Then, add 3.0g of zinc methacrylate, 0.4mL of triallyl isocyanurate and 0.2g of dicumyl peroxide in sequence. After mixing evenly, control the temperature of each zone at 150℃ and keep it at that temperature for 4min before extrusion. After cooling the extruded strip in a cooling water tank, cut it into pellets with a particle size of 3mm. Then, place the pellets in a drying oven at 50℃ and dry them with hot air for 2h to obtain a compatible elastomer.

[0066] The reaction principle for preparing compatible elastomers is as follows:

[0067] Dicumyl peroxide decomposes under heating conditions to generate free radicals, which initiate free radical activation of the ethylene-vinyl acetate copolymer molecular chains, forming macromolecular free radical centers. The carbon-carbon double bonds in zinc methacrylate participate in free radical addition, and the zinc carboxylate groups form ion-associative structures in the system. Triallyl isocyanurate, as a polyene co-agent, has its allyl double bonds participating in the free radical reaction, causing connections between different molecular chains. Thus, a covalent bond structure characterized by carbon chain linkage and an ion bond structure characterized by zinc carboxylate association are formed simultaneously in the system, resulting in a compatible elastomer with ion-covalent composite crosslinking characteristics.

[0068] The mechanism of action of compatible elastomers in flexible new energy cable materials is as follows:

[0069] In this process, the compatible elastomer obtained in step one is essentially a composite elastomer with ethylene-vinyl acetate copolymer as the continuous organic matrix and ion association structure and moderate covalent linkage structure introduced into its molecular chain. The ethylene chain segment provides basic flexibility and non-polar containment environment, the vinyl acetate chain segment gives the material a certain polarity and interfacial affinity, the zinc carboxylic acid structure corresponding to zinc methacrylate forms reversible ion interaction nodes in the system, and the inter-chain connection brought by triallyl isocyanurate further makes the elastomer have a relatively stable network constraint. Thus, it is different from both simple linear thermoplastic elastomers and overly rigid permanent cross-linked systems.

[0070] In subsequent flexible new energy cable materials, this compatible elastomer mainly plays the role of interphase transition phase and stress coordination phase. On the one hand, with the compatibility characteristics between its ethylene-vinyl acetate backbone and organic matrix, it is beneficial to improve the interfacial bonding state and dispersion uniformity between different polymer phase regions. On the other hand, it can provide adjustable local constraints and recoverable connection relationships through ion association nodes during stress, heat and repeated deformation, so that the stress transmission between phases is more continuous, the deformation response is more coordinated, and the tendency of local strain accumulation, debonding or structural loosening in the interface region is reduced.

[0071] Therefore, this compatible elastomer not only affects the phase region structure and interface integrity of the final material, but also further affects the tensile load, elongation at break, hardness balance, structural retention after thermal aging, and stable response during dynamic flexural processes of flexible new energy cable materials.

[0072] Step 2: Preparation of modified silica gel particles

[0073] Weigh out 120.0 mL of anhydrous ethanol, 20.0 mL of deionized water, and 6.0 mL of 25 wt% ammonia and add them to the reaction vessel. Stir until the mixture is homogeneous, then add 4.0 g of dopamine hydrochloride and 2.0 g of boric acid. Stir until homogeneous, then add 20.0 mL of tetraethyl orthosilicate dropwise over 30 min. After the addition is complete, heat the reaction vessel to 30 °C and keep it at this temperature for 5 h with stirring. After the reaction is complete, filter and collect the solid. Wash the solid twice with anhydrous ethanol and twice with deionized water, then place it in a drying oven at 60 °C and vacuum dry for 8 h. Finally, keep it at 75 °C for 1 h to obtain modified silica gel particles.

[0074] The reaction principle for preparing modified silica gel particles is as follows:

[0075] Tetraethyl orthosilicate undergoes alkaline-catalyzed hydrolysis in an ethanol-water-ammonia system, and further condenses to form an inorganic silicon-oxygen network structure dominated by Si-O-Si bonds. Dopamine hydrochloride undergoes oxidation and self-polymerization under alkaline conditions to generate a polydopamine component containing catechol hydroxyl and amino structural units, which is deposited on the surface of the silicon-oxygen network or forms composite particles together with it. Boric acid coordinates or esterifies with the catechol hydroxyl groups in dopamine or polydopamine molecules, introducing boron-containing connecting structures into the particle surface. Thus, the system simultaneously contains a Si-O-Si condensation structure, a polydopamine organic layer, and a surface chemical bonding structure formed by boric acid, ultimately yielding silica particles with organic / boron-containing components modified on the surface.

[0076] The mechanism of action of modified silicone particles in flexible new energy cable materials is as follows:

[0077] In this process, the modified silica particles obtained in step two are composite fillers that combine an organic interface layer, a boron-containing bonding structure, and an inorganic silicon-oxygen network. In terms of their structure, the Si-O-Si network formed by tetraethyl orthosilicate provides a relatively stable inorganic framework for the particles, enabling them to provide local support, thermal stability, and morphology retention within the material system. The polydopamine layer endows the particle surface with abundant active or polar sites such as catechol hydroxyl and amino groups, giving the originally inorganic and easily agglomerated silica particles better interfacial affinity and dispersion adaptability. The boron-containing bonding structure formed with the participation of boric acid further modulates the interaction mode of the particle surface, preventing it from becoming brittle. Instead of existing merely as an inert filler, it can form relatively stable interfacial connections and multi-point effects with polyurethane elastomers, compatible elastomers, and other polar segments. In subsequent flexible new energy cable materials, the modified silicone particles mainly play the role of interfacial regulation phase and structural stabilizing phase. On the one hand, it improves the material's structural retention ability under thermal action through the inorganic silicon-oxygen network. On the other hand, it mitigates the polarity difference between inorganic particles and organic elastomer matrix through the polydopamine / boron-containing surface layer, reducing the tendency of particle agglomeration, interfacial debonding, and local stress concentration, so that the stress under external force can be more evenly transferred from the matrix to the area around the filler.

[0078] Therefore, its impact on the final material is not simply manifested as filling reinforcement, but rather as a synergistic adjustment of multiple aspects such as particle dispersion, interface integrity, local support, and post-thermal structural maintenance, which in turn relates to the tensile strength, elongation at break, retention rate after thermal aging, and stability of flexible new energy cable materials during repeated bending.

[0079] Step 3: Preparation of sheath matrix premix

[0080] Weigh out 50 parts by weight of the flexible siloxane polyurethane elastomer prepared in Example 1 and add it to a mixer. After heating and plasticizing, add 8 parts of compatible elastomer, 0.2 parts of antioxidant 1010, 0.2 parts of antioxidant 168 and 0.2 parts of ethylene bis-stearamide in sequence. Mix evenly and then knead at 125°C for 6 minutes. After kneading, press the material into sheets, cool it, and then crush it into 3mm particles to obtain the sheath matrix premix.

[0081] Step 4: Prepare the outer sheath material

[0082] Weigh out 50 parts by weight of the sheath matrix premix and add it to the twin-screw extruder to melt. After the melt stabilizes, add 2 parts of modified silicone particles, control the temperature of each zone to 135℃, keep it at the temperature for 2 minutes, and then extrude. After the extruded strip is cooled in a cooling water tank, it is granulated with a particle size of 3mm. Then, place the granules in a drying oven at 50℃ and dry them with hot air for 2 hours to obtain the outer sheath preparation material.

[0083] The reaction principle for preparing the outer sheath preparatory material is as follows:

[0084] Flexible siloxane polyurethane elastomers and compatible elastomers undergo melt plasticization under heating and melting conditions, forming molecular chain entanglements and interphase dispersion structures under shearing action. Specifically, the urethane groups, ether bonds, and siloxane segments in the flexible siloxane polyurethane elastomer, along with the ethylene-vinyl acetate copolymer segments, the ion-association structure formed by zinc methacrylate, and the interchain linkage structure composed of triallyl isocyanurate in the compatible elastomer, are distributed throughout the melt system. Antioxidant 1010, antioxidant 168, and ethylene bis-stearamide exist in a dispersed state within the organic matrix. Subsequently, modified silicone particles are further dispersed into the melt system under thermal processing conditions, maintaining a Si-O-Si network structure internally and retaining a polydopamine layer and boron-containing chemical structure on the surface. These particles interact with the urethane groups, ether oxygen, and other polar groups in the matrix through polar interactions, hydrogen bonding, and interfacial adsorption, thus forming a composite material system where an organic polymer continuous phase and an inorganic particulate dispersed phase coexist.

[0085] Step 5: Preparation of Flexible New Energy Cable Materials

[0086] After drying the outer sheath material in a 50℃ hot air drying oven for 2 hours, it was fed into a single-screw extruder for outer sheath extrusion. The single-screw extruder had a screw diameter of 25mm, a length-to-diameter ratio of 25:1, and a screw speed of 18r / min. The extruder's zone 1 temperature was 125℃, zone 2 temperature was 130℃, zone 3 temperature was 135℃, and the die head temperature was 135℃. After extrusion and coating the core surface, the test cable was obtained. After cooling with 25℃ cooling water, pulling, and winding, it was placed in an environment of 23℃ and 50% relative humidity for 24 hours to obtain a flexible new energy cable.

[0087] The core is formed by two insulated wire cores arranged side by side. The conductor of each insulated wire core is formed by twisting together 30 annealed copper monofilaments with a diameter of 0.25 mm. The cross-sectional area of ​​a single conductor is 1.47 mm². 2 Each insulated wire core has an outer diameter of 3.4mm. The two insulated wire cores are fed into the machine head side by side, and the thickness of the coating layer is controlled to be 1.0mm.

[0088] Example 5

[0089] This embodiment provides a method for preparing a flexible new energy cable material that is resistant to bending, including the following steps:

[0090] Step 1: Preparation of Compatible Elastomer

[0091] Weigh out 60.0g of ethylene-vinyl acetate copolymer and add it to the reactive extruder for melt plasticization. Then, add 4.0g of zinc methacrylate, 0.6mL of triallyl isocyanurate and 0.3g of dicumyl peroxide in sequence. After mixing evenly, control the temperature of each zone at 160℃ and keep it at that temperature for 2min before extrusion. After cooling the extruded strip in a cooling water tank, cut it into pellets with a particle size of 5mm. Then, place the pellets in a drying oven at 55℃ and dry them with hot air for 3h to obtain a compatible elastomer.

[0092] Step 2: Preparation of modified silica gel particles

[0093] Weigh out 120.0 mL of anhydrous ethanol, 24.0 mL of deionized water, and 8.0 mL of 28 wt% ammonia and add them to the reaction vessel. Stir until well mixed, then add 5.0 g of dopamine hydrochloride and 3.0 g of boric acid. Stir until well mixed, then add 20.0 mL of tetraethyl orthosilicate dropwise over 40 min. After the addition is complete, heat the reaction vessel to 35 °C and keep it at this temperature for 7 h with stirring. After the reaction is complete, filter and collect the solid. Wash the solid three times each with anhydrous ethanol and deionized water, then place it in a drying oven at 60 °C and vacuum dry for 10 h. Finally, keep it at 85 °C for 2 h to obtain modified silica gel particles.

[0094] Step 3: Preparation of sheath matrix premix

[0095] By weight, 60 parts of the flexible siloxane polyurethane elastomer prepared in Example 2 were weighed and added to a mixer. After heating and plasticizing, 10 parts of the compatible elastomer, 0.3 parts of antioxidant 1010, 0.3 parts of antioxidant 168 and 0.3 parts of ethylene bis-stearamide were added in sequence. After mixing evenly, the mixture was mixed at 135°C for 8 minutes. After the mixing was completed, the material was pressed into sheets and cooled, and then crushed into 5mm particles to obtain the sheath matrix premix.

[0096] Step 4: Prepare the outer sheath material

[0097] Weigh out 60 parts by weight of the sheath matrix premix and add it to the twin-screw extruder to melt. After the melt stabilizes, add 3 parts of modified silicone particles, control the temperature of each zone to 150℃, keep it at the temperature for 4 minutes, and then extrude. After the extruded strip is cooled in a cooling water tank, it is granulated with a particle size of 5mm. The granules are then placed in a drying oven at 55℃ and dried with hot air for 3 hours to obtain the outer sheath preparation material.

[0098] Step 5: Preparation of Flexible New Energy Cable Materials

[0099] After drying the outer sheath material in a 50℃ hot air drying oven for 2 hours, it was fed into a single-screw extruder for outer sheath extrusion. The single-screw extruder had a screw diameter of 25mm, a length-to-diameter ratio of 25:1, and a screw speed of 18r / min. The extruder's zone 1 temperature was 125℃, zone 2 temperature was 130℃, zone 3 temperature was 135℃, and the die head temperature was 135℃. After extrusion and coating the core surface, the test cable was obtained. After cooling with 25℃ cooling water, pulling, and winding, it was placed in an environment of 23℃ and 50% relative humidity for 24 hours to obtain a flexible new energy cable.

[0100] The core is formed by two insulated wire cores arranged side by side. The conductor of each insulated wire core is formed by twisting together 30 annealed copper monofilaments with a diameter of 0.25 mm. The cross-sectional area of ​​a single conductor is 1.47 mm². 2 Each insulated wire core has an outer diameter of 3.4mm. The two insulated wire cores are fed into the machine head side by side, and the thickness of the coating layer is controlled to be 1.0mm.

[0101] Example 6

[0102] This embodiment provides a method for preparing a flexible new energy cable material that is resistant to bending, including the following steps:

[0103] Step 1: Preparation of Compatible Elastomer

[0104] Weigh out 55.0g of ethylene-vinyl acetate copolymer and add it to the reactive extruder for melt plasticization. Then, add 3.5g of zinc methacrylate, 0.5mL of triallyl isocyanurate and 0.3g of dicumyl peroxide in sequence. After mixing evenly, control the temperature of each zone at 155℃ and keep it at that temperature for 3min before extrusion. After cooling the extruded strip in a cooling water tank, cut it into pellets with a particle size of 4mm. Then, place the pellets in a drying oven at 53℃ and dry them with hot air for 3h to obtain a compatible elastomer.

[0105] Step 2: Preparation of modified silica gel particles

[0106] Weigh out 120.0 mL of anhydrous ethanol, 22.0 mL of deionized water, and 7.0 mL of 27 wt% ammonia and add them to the reaction vessel. Stir until well mixed, then add 4.5 g of dopamine hydrochloride and 2.5 g of boric acid. Stir until well mixed, then add 20.0 mL of tetraethyl orthosilicate dropwise over 35 min. After the addition is complete, heat the reaction vessel to 33 °C and keep it at this temperature for 6 h with stirring. After the reaction is complete, filter and collect the solid. Wash the solid three times each with anhydrous ethanol and deionized water, then place it in a drying oven at 60 °C and vacuum dry for 9 h. Finally, keep it at 80 °C for 2 h to obtain modified silica gel particles.

[0107] Step 3: Preparation of sheath matrix premix

[0108] Weigh out 55 parts by weight of the flexible siloxane polyurethane elastomer prepared in Example 3 and add it to a mixer. After heating and plasticizing, add 9 parts of compatible elastomer, 0.3 parts of antioxidant 1010, 0.3 parts of antioxidant 168 and 0.3 parts of ethylene bis-stearamide in sequence. Mix evenly and then knead at 130°C for 7 minutes. After kneading, press the material into sheets, cool it, and then crush it into 4mm particles to obtain the sheath matrix premix.

[0109] Step 4: Prepare the outer sheath material

[0110] Weigh out 55 parts by weight of the sheath matrix premix and add it to the twin-screw extruder to melt. After the melt stabilizes, add 3 parts of modified silicone particles. Control the temperature of each zone to 143℃ and keep it at that temperature for 3 minutes before extruding. After the extruded strip is cooled in a cooling water tank, it is granulated with a particle size of 4mm. The granules are then placed in a drying oven at 53℃ and dried with hot air for 3 hours to obtain the outer sheath preparation material.

[0111] Step 5: Preparation of Flexible New Energy Cable Materials

[0112] After drying the outer sheath material in a 50℃ hot air drying oven for 2 hours, it was fed into a single-screw extruder for outer sheath extrusion. The single-screw extruder had a screw diameter of 25mm, a length-to-diameter ratio of 25:1, and a screw speed of 18r / min. The extruder's zone 1 temperature was 125℃, zone 2 temperature was 130℃, zone 3 temperature was 135℃, and the die head temperature was 135℃. After extrusion and coating the core surface, the test cable was obtained. After cooling with 25℃ cooling water, pulling, and winding, it was placed in an environment of 23℃ and 50% relative humidity for 24 hours to obtain a flexible new energy cable.

[0113] The core is formed by two insulated wire cores arranged side by side. The conductor of each insulated wire core is formed by twisting together 30 annealed copper monofilaments with a diameter of 0.25 mm. The cross-sectional area of ​​a single conductor is 1.47 mm². 2 Each insulated wire core has an outer diameter of 3.4mm. The two insulated wire cores are fed into the machine head side by side, and the thickness of the coating layer is controlled to be 1.0mm.

[0114] Comparative Example 1

[0115] The difference between this comparative example and Example 6 is that step I is omitted, and in step II, an equal mass of polytetrahydrofuran ether diol is used instead of siloxane polyol.

[0116] Comparative Example 2

[0117] The difference between this comparative example and Example 6 is that step one is omitted, and the use of a compatible elastomer is omitted in step two.

[0118] Comparative Example 3

[0119] The difference between this comparative example and Example 6 is that dopamine hydrochloride and boric acid are omitted in step two.

[0120] Performance testing:

[0121] The tensile strength and elongation at break of the outer sheath pre-materials prepared using Examples 4-6 and Comparative Examples 1-3 were tested in accordance with the standard GB / T 2951.11-2008 "General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 11: General Test Methods for Thickness and Dimensional Measurement and Mechanical Properties".

[0122] The Shore A hardness of the outer sheath pre-materials prepared using Examples 4-6 and Comparative Examples 1-3 was tested in accordance with the standard GB / T 39693.4-2025 "Determination of hardness of vulcanized rubber or thermoplastic rubber - Part 4: Determination of indentation hardness by Shore hardness tester (Shore hardness)".

[0123] According to standard GB / T 2951.12-2008 "General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 12: General Test Methods - Thermal Aging Test Method", the outer sheath pre-materials prepared using Examples 4-6 and Comparative Examples 1-3 were subjected to thermal aging. The tensile strength of the aged cable materials was then tested according to GB / T 2951.11-2008, and the tensile strength retention rate was calculated.

[0124] The number of flexural cycles of the flexible new energy cable materials prepared using Examples 4-6 and Comparative Examples 1-3 were tested in accordance with the standard JB / T 10696.2-2007 "Mechanical and Physical-Chemical Properties Test Methods for Wires and Cables - Part 2: Flexural Test of Flexible Wires and Cables". The specific data are shown in Table 1.

[0125] Table 1 - Performance Test Data for Each Sample

[0126] Project Group Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Tensile strength / MPa 13.7 13.8 13.8 11.4 10.8 11.9 Elongation at break / % 342 343 345 268 251 287 Hardness / Shore A 87 87 86 91 89 90 Tensile strength retention rate / % 88.9 89.0 89.1 81.2 79.5 83.1 Number of flexions / times 32800 32900 33100 21600 18400 24300

[0127] Data Analysis:

[0128] Comparative analysis of the data in Table 1 reveals that the outer sheath preparatory material prepared in this invention exhibits a tensile strength of 13.8 MPa, an elongation at break of 345%, and a hardness of 86 Shore A. Furthermore, the tensile strength retention rate after heat aging is 89.1%, and the flexible new energy cable material achieves 33,100 single-pass flexural cycles. All these data are superior to the comparative example, indicating that…

[0129] In Comparative Example 1, after adjustments to steps I and II, the original polyurethane structure containing siloxane segments failed to form in the premixed matrix material corresponding to the outer sheath layer. This affected the coordination relationship between the flexible segments, polar groups, and hard segments within the outer sheath layer. During tensile and repeated deformation, there was a lack of smooth transition between segment orientation, recovery, and subsequent transmission. Local areas were more likely to bear higher deformation loads and gradually evolved into unstable parts. At the same time, the coordination effect of the matrix on the modified silicone particles and adjacent phase regions was weakened, the continuity of load transmission in the outer sheath layer decreased, and local structural disturbances were more easily amplified after thermal effects. Therefore, the sample could not maintain the coordination between the performance of the outer sheath layer and the flexural performance of the finished cable.

[0130] In Comparative Example 2, after adjustments to steps one and three, the compatible elastomer originally used to connect different components in the outer sheath system was removed. This resulted in a lack of a stable transition layer within the premixed sheath matrix. Although the outer sheath remained a composite system after molding, the response rhythms of each phase during stress were no longer consistent. Strain accumulation, transmission lag, and asynchronous local deformation were more likely to occur near the interface. Especially under continuous tension or cyclic bending conditions in flexible new energy cables, the relative displacement between adjacent phase regions gradually increased, making the interface area more likely to become the starting point for damage evolution. After further thermal history, this interphase incoordination was more likely to be transmitted to the macroscopic stress performance, affecting the structural stability of the outer sheath and the consistency of the finished cable's response.

[0131] In Comparative Example 3, after adjustments to steps two and four, the modified silica particles did not form an interface layer compatible with the organic matrix of the outer sheath. After the particles were added to the outer sheath preparatory material, they were more likely to exhibit a normal heterogeneous filling state. It was difficult for them to establish a stable and continuous bonding relationship with the surrounding matrix. As a result, the area around the particles was more prone to interface discontinuity or local agglomeration during the outer sheath forming and subsequent stress process. When the load was transferred to such areas, it often manifested as local constraint imbalance and was difficult to share the deformation with the matrix. As the flexible new energy cable underwent stretching, bending and heat exposure, the local disturbance caused by this insufficient interface layer would gradually accumulate and further affect the internal stress continuity, interface integrity and post-thermal structure retention of the outer sheath.

[0132] In conclusion, the proposed solution is not a simple replacement or conventional superposition of a single component, but rather a hierarchical configuration formed by the flexible matrix structure of the outer sheath layer established in steps I and II, the phase transition relationships established in steps I and III, and the particle interface states constructed in steps II and IV. When this configuration is subjected to tension, flexure, and thermal exposure conditions, the components do not act independently, but rather participate in the force transmission, deformation coordination, and local structural maintenance within the outer sheath layer, enabling the flexible new energy cable to maintain a relatively continuous response link during use. If any level is weakened, the force path, interface state, and phase region synergy of the outer sheath layer will change accordingly, ultimately resulting in a decrease in the overall performance of the finished cable.

[0133] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A flexible new energy cable material resistant to bending, comprising a core and an outer sheath, characterized in that, The outer sheath layer is obtained by melting and extruding the outer sheath preparation material and coating it onto the surface of the core. The outer sheath preparation material is a composite material containing a sheath matrix premix and modified silicone particles; The sheath matrix premix is ​​a premix composed of flexible siloxane polyurethane elastomer, compatible elastomer, antioxidant 1010, antioxidant 168 and ethylene bis-stearamide. The modified silica particles are silicon-oxygen network particles with a polydopamine layer and a boron-containing linkage structure on their surface. The flexible siloxane polyurethane elastomer is a siloxane-containing polyurethane elastomer constructed from siloxane polyols. The compatible elastomer is a composite elastomer containing ethylene-vinyl acetate copolymer segments, ion-associative structures, and inter-chain linkage structures.

2. The flexible new energy cable material with bend resistance according to claim 1, characterized in that, The preparation method of the sheath matrix premix is ​​as follows: Weigh 50-60 parts of flexible siloxane polyurethane elastomer by weight and add it to a mixer for heating and plasticizing. Then, add 8-10 parts of compatible elastomer, 0.2-0.3 parts of antioxidant 1010, 0.2-0.3 parts of antioxidant 168 and 0.2-0.3 parts of ethylene bis-stearamide in sequence. After mixing evenly, mix at 125-135℃ for 6-8 minutes. The sheath matrix premix is ​​then obtained after post-treatment.

3. The flexible new energy cable material with bend resistance according to claim 1, characterized in that, The preparation method of the outer sheath premix is ​​as follows: Weigh 50-60 parts by weight of sheath matrix premix and add it to a twin-screw extruder to melt. After the melt stabilizes, add 2-3 parts of modified silicone particles, control the temperature of each zone to 135-150℃, keep it at the temperature for 2-4 minutes, and then extrude. After post-processing, the outer sheath premix is ​​obtained.

4. The flexible new energy cable material with bend resistance according to claim 1, characterized in that, The modified silica gel particles are prepared by adding anhydrous ethanol, deionized water and 25-28 wt% ammonia water into a reaction vessel and stirring. After mixing evenly, dopamine hydrochloride and boric acid are added and stirred evenly. Then, tetraethyl orthosilicate is added dropwise. After the addition is complete, the reaction vessel is heated to 30-35℃ and kept at this temperature for 5-7 hours. The modified silica gel particles are then obtained through post-treatment.

5. The flexible new energy cable material with bend resistance according to claim 4, characterized in that, The ratio of anhydrous ethanol, deionized water, 25-28 wt% ammonia, dopamine hydrochloride, boric acid, and tetraethyl orthosilicate is 120 mL: 20-24 mL: 6-8 mL: 4-5 g: 2-3 g: 20 mL, and the addition time of tetraethyl orthosilicate is 30-40 min.

6. The flexible new energy cable material with bend resistance according to claim 1, characterized in that, The flexible siloxane polyurethane elastomer is prepared by the following method: A1. Toluene and polymethylhydrosiloxane were added to a reaction vessel and stirred until homogeneous. Chloroplatinic acid hexahydrate was then added, followed by the dropwise addition of allyl glycidyl ether over 25-35 minutes. After the addition was complete, the reaction vessel was heated to 75-85°C and stirred for 2-4 hours. Then, 2,5-furandiethanol and tetrabutylammonium bromide were added, and the temperature was further increased to 95-105°C and stirred for 4-6 hours. After the reaction was completed, the pressure was reduced and the mixture was distilled until no liquid was collected to obtain siloxane polyol. A2. Add siloxane polyol and polytetrahydrofuran ether diol to a reaction vessel and stir. After mixing evenly, evacuate and heat to 90-100℃ for dehydration for 1-2 hours. Then, introduce nitrogen gas and cool to 70-75℃. Add isophorone diisocyanate and dibutyltin dilaurate. Heat the reaction vessel to 75-85℃ and stir for 1.5-2.5 hours. Then, add 1,4-butanediol and continue to heat to 85-90℃ and stir for 1-2 hours. After the reaction is complete, reduce the pressure and distill until no liquid is collected to obtain flexible siloxane polyurethane elastomer.

7. The flexible new energy cable material resistant to bending according to claim 6, characterized in that, In step A1, the ratio of toluene, polymethylhydrosiloxane, chloroplatinic acid hexahydrate, allyl glycidyl ether, 2,5-furandiethanol and tetrabutylammonium bromide is 15mL:20-25mL:0.01g:5-6mL:3-4g:0.1g; in step A2, the ratio of siloxane polyol, polytetrahydrofuran ether diol, isophorone diisocyanate, dibutyltin dilaurate and 1,4-butanediol is 10-15g:36-42g:6-8mL:0.03mL:1-2mL.

8. The flexible new energy cable material with bend resistance according to claim 1, characterized in that, The method for preparing the compatible elastomer is as follows: after adding ethylene-vinyl acetate copolymer to a reactive extruder for melt plasticization, zinc methacrylate, triallyl isocyanurate and dicumyl peroxide are added sequentially. After mixing evenly, the temperature of each zone is controlled at 150-160℃, and after holding at this temperature for 2-4 minutes, the mixture is extruded. The extruded strip is cooled in a cooling water tank and then granulated. The granules are then placed in a drying oven at 50-55℃ and dried with hot air for 2-3 hours to obtain the compatible elastomer.

9. The flexible new energy cable material with bend resistance according to claim 8, characterized in that, The ratio of ethylene-vinyl acetate copolymer, zinc methacrylate, triallyl isocyanurate, and dicumyl peroxide is 50-60g:3-4g:0.4-0.6mL:0.2-0.3g, and the particle size is 3-5mm.

10. A method for preparing a bend-resistant flexible new energy cable material as described in any one of claims 1-9, characterized in that, Includes the following steps: After drying the outer sheath material in a 50℃ hot air drying oven for 2 hours, it is added to a single screw extruder for extrusion to coat the core surface. After post-processing, flexible new energy cable material is obtained.

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