Low-temperature-resistant and flexible wire and cable insulating sheath material and preparation process thereof

Abstract

The invention relates to the technical field of wire and cable materials, and provides a low-temperature-resistant and flexible wire and cable insulating sheath material and a preparation process thereof. According to the invention, multiple functional raw materials are compounded, polyethylene, chlorinated polyethylene and ethylene propylene rubber are used as polymer matrixes, the multiple functional raw materials modify a polymer or participate in formation of a cross-linked network structure, and the obtained wire and cable sheath has good electrical performance, flexibility, flame retardance, low temperature resistance, aging resistance and mechanical performance.

Description

Technical Field

[0001] This invention relates to the field of wire and cable materials technology, and in particular to a low-temperature resistant and flexible wire and cable insulation sheath material and its preparation process. Background Technology

[0002] During use, cables require an insulating and flame-retardant sheath, and the quality of the sheath significantly impacts cable performance. To maintain cable flexibility, the sheath must also possess flexible characteristics. Traditional flexible cable sheaths are made from low-smoke halogen-free materials, using polyolefin resin as a base material, with added flame retardants, fillers, antioxidants, and other additives, obtained through screw extrusion and plasticization in appropriate proportions.

[0003] However, with increasingly stringent requirements for cable operating environments in fields such as power, communications, and industrial automation, and with the changing application environments of cables, traditional formulations alone are insufficient to simultaneously meet performance requirements in high and low temperature environments, flame retardancy, and aging resistance. For example, in low-temperature environments (such as cold outdoor regions), conventional cable sheaths are prone to hardening and brittleness. Therefore, higher performance requirements are placed on cable sheath materials. Summary of the Invention

[0004] The present invention aims to solve at least one of the above technical problems and provide a low-temperature resistant and flexible wire and cable insulation sheath material and its preparation process to meet the needs of use in low-temperature environments.

[0005] One objective of this invention is to provide a low-temperature resistant and flexible wire and cable insulation sheath material, comprising the following raw materials in parts by weight:

[0006] The mixture comprises 40-60 parts polyethylene, 30-50 parts chlorinated polyethylene, 10-30 parts ethylene propylene rubber, 10-20 parts modified acrylic resin, 4-10 parts hydroxyl-terminated polybutadiene, 4-10 parts toughening agent, 4-10 parts flame retardant, 2-6 parts dioctyl sebacate, 2-6 parts vulcanizing agent, 0.2-0.7 parts first silane coupling agent, and 0.2-0.7 parts second silane coupling agent; the first silane coupling agent and the second silane coupling agent can undergo a nucleophilic addition reaction.

[0007] Polyethylene (PE) possesses characteristics such as chemical resistance, high temperature resistance, good electrical insulation, flame retardancy, and environmental friendliness. Chlorinated polyethylene (CPE) exhibits good weather resistance, ozone resistance, flame retardancy, chemical and oil resistance, tear resistance, flexural strength, and abrasion resistance. It also boasts excellent processing performance, is easy to mold, and can be used outdoors for extended periods without significant aging. Ethylene propylene rubber (EPR) exhibits outstanding aging resistance, electrical insulation, and ozone resistance, good chemical stability, high temperature resistance, and excellent electrical properties, making it suitable for outdoor use.

[0008] Modified acrylic resin possesses excellent weather resistance and chemical corrosion resistance, along with good physical and mechanical properties such as high toughness, enabling it to withstand external impacts and pressures. It also exhibits good adhesion to various materials, ensuring a tight bond between the cable sheath and the cable, thus improving the overall performance of the cable. Hydroxyl-terminated polybutadiene, with hydroxyl groups at both ends of its molecular chain, can participate in the copolymerization process to form a three-dimensional network structure. This improves the acid and alkali resistance, abrasion resistance, low-temperature resistance, hydrolysis resistance, and insulation properties of wire and cable insulation sheaths. It can also act as a plasticizer for cable sheaths, making the sheath material easier to process and less prone to brittleness at low temperatures, thus improving the plasticity, flexibility, and impact resistance of the cable sheath. Simultaneously, the insulating properties of hydroxyl-terminated polybutadiene make cables safer and more reliable when transmitting electricity.

[0009] Dioctyl sebacate can be used as a plasticizer to improve the processing properties of polymers, making them easier to shape and mold during processing. It can improve the flexibility, cold resistance, and durability of wire and cable sheaths, maintaining flexibility at low temperatures and exhibiting good thermal stability. Furthermore, compared to traditional plasticizers (such as phthalates), dioctyl sebacate is more environmentally friendly. Silane coupling agents act as lubricants, reducing the melt viscosity of the polyethylene matrix, improving its fluidity and processing stability, stabilizing extrusion molding, and can also be grafted onto the polymer backbone to modify the polymer. The first and second silane coupling agents can undergo nucleophilic addition reactions, forming a more complex cross-linked network in the polymer, increasing structural strength, and thus improving the electrical and mechanical properties of wire and cable sheaths.

[0010] This invention utilizes a variety of functional raw materials to create a composite, resulting wire and cable sheath with excellent electrical properties, flexibility, flame retardancy, low-temperature resistance, aging resistance, and mechanical properties.

[0011] Preferably, the ethylene propylene rubber includes at least one of binary ethylene propylene rubber, modified binary ethylene propylene rubber, and ternary ethylene propylene rubber.

[0012] Preferably, the mixture comprises 50-60 parts of soft acrylate monomer, 10-20 parts of hard acrylate monomer, 5-10 parts of modified hydroxyethyl acrylate, 3-6 parts of acrylic acid, 5-10 parts of vinyl silicone oil, 0.2-1 parts of initiator, 0.05-0.1 parts of platinum catalyst, and 50-70 parts of solvent.

[0013] Preferably, the modified hydroxyethyl acrylate is prepared by a nucleophilic addition reaction between 3-isocyanate-methylene-3,5,5-trimethylcyclohexyl isocyanate as a bridging agent and hydroxyethyl hexahydrotriazine and hydroxyethyl acrylate.

[0014] This invention utilizes soft acrylate monomers, hard acrylate monomers, modified hydroxyethyl acrylate, and acrylic acid as comonomers to prepare a modified acrylic resin via free radical polymerization under the action of an initiator. This modified hydroxyethyl acrylate incorporates a triazine ring structure with good thermal stability and flame retardant properties, while also possessing a benzene ring structure, exhibiting good hydrophobicity. This imparts excellent thermal stability, water resistance, high-temperature aging resistance, and flame retardant properties to the sheathing of wires and cables.

[0015] Preferably, the toughening agent includes at least one of chlorinated polyethylene elastomer, polyethylene octene co-elastomer, cellulose, and chlorinated paraffin oil.

[0016] Preferably, the vulcanizing agent includes at least one of benzamide peroxide, dicumyl peroxide, dicumyl hydrogen peroxide, and 2,4-di-tert-butyl peroxide.

[0017] Preferably, the flame retardant includes at least one of magnesium hydroxide, aluminum hydroxide, antimony trioxide, silicon dioxide, montmorillonite, and talc.

[0018] Preferably, the first silane coupling agent includes at least one of KH570 and KH560;

[0019] The second silane coupling agent includes at least one of MPTES and KH590.

[0020] Another objective of this invention is to provide a manufacturing process for a low-temperature resistant and flexible wire and cable insulation sheath material, comprising the following steps:

[0021] S1. Preparation of modified acrylic resin:

[0022] 1) Weigh the soft acrylate monomer, hard acrylate monomer, modified hydroxyethyl acrylate, acrylic acid and part of the solvent according to the weight parts and put them into the reaction vessel, and stir and preheat at 55~65℃ for 2~4h.

[0023] 2) Heat the reactor to 65~75℃, add a portion of the initiator, and maintain the temperature for 0.5~2 hours;

[0024] 3) Then add platinum catalyst and vinyl silicone oil, complete the addition within 1 hour, keep warm for 0.5~2 hours, then add initiator and solvent, complete the addition within 0.5 hours, keep warm for 1~2 hours, cool down, and discharge to prepare modified acrylic resin;

[0025] S2. Mix polyethylene, chlorinated polyethylene, ethylene propylene rubber, modified acrylic resin, toughening agent, flame retardant, vulcanizing agent, first silane coupling agent, and second silane coupling agent for one mixing process.

[0026] S3. Then add hydroxyl-terminated polybutadiene and dioctyl sebacate, and perform secondary mixing. After mixing, the low-temperature resistant and flexible wire and cable insulation sheath material is obtained.

[0027] This invention utilizes soft acrylate monomers, hard acrylate monomers, modified hydroxyethyl acrylate, and acrylic acid as comonomers to prepare modified acrylic resin through free radical polymerization under the action of an initiator. The modified acrylic resin exhibits excellent weather resistance, chemical corrosion resistance, and good physical and mechanical properties, such as high toughness, enabling it to withstand external impacts and pressures. It also demonstrates good adhesion to various materials, ensuring a tight bond between the cable sheath and the cable, thus improving the overall performance of the cable. The modified acrylic resin is further modified by mixing it with various functional raw materials, including polyethylene, chlorinated polyethylene, ethylene propylene rubber, modified acrylic resin, hydroxyl-terminated polybutadiene, dioctyl sebacate, toughening agents, flame retardants, vulcanizing agents, a first silane coupling agent, and a second silane coupling agent. During the mixing process, the polymer is modified, resulting in a wire and cable sheath with excellent electrical properties, flexibility, flame retardancy, low-temperature resistance, aging resistance, and mechanical properties.

[0028] Preferably, in step S1, the modified hydroxyethyl acrylate is prepared as follows: hydroxyethyl hexahydrotriazine and 3-isocyanate-methylene-3,5,5-trimethylcyclohexyl isocyanate are added to a reactor, mixed and stirred, and then dibutyltin dilaurate is added. The mixture is stirred and reacted at 35-45°C for 1-2 hours. Subsequently, hydroxyethyl acrylate is added, and the mixture is stirred and reacted at 45-55°C for another 1-2 hours. After the reaction is completed, the mixture is filtered, rotary evaporated, and dried to obtain the modified hydroxyethyl acrylate. This modified hydroxyethyl acrylate introduces a triazine ring structure with good thermal stability and flame retardant effect, while also possessing a benzene ring structure, exhibiting good hydrophobic properties. This imparts good thermal stability, water resistance, high-temperature aging resistance, and flame retardant effect to the sheathing of wires and cables.

[0029] Preferably, in step S2, the temperature of the first mixing is 150-180℃ and the time is 10-30 minutes.

[0030] Preferably, in step S3, the temperature of the secondary mixing is 120-150℃ and the time is 10-30 minutes.

[0031] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0032] 1. This invention utilizes a blend of various functional raw materials, with polyethylene, chlorinated polyethylene, and ethylene propylene rubber as the polymer matrix. These functional raw materials modify the polymer or participate in the formation of a cross-linked network structure. The resulting wire and cable sheath exhibits excellent electrical properties, flexibility, flame retardancy, low-temperature resistance, aging resistance, and mechanical properties. Modified acrylic resin possesses excellent weather resistance, chemical corrosion resistance, mechanical properties, and good adhesion to various materials, ensuring a tight bond between the cable sheath and the cable and improving the overall performance of the cable. Hydroxyl-terminated polybutadiene can participate in the copolymerization process to form a three-dimensional network structure, improving the acid and alkali resistance, abrasion resistance, low-temperature resistance, hydrolysis resistance, and insulation properties of the wire and cable insulation sheath. It can also act as a plasticizer, making the sheath material easier to process and less prone to brittleness at low temperatures, thus improving the plasticity, flexibility, and impact resistance of the cable sheath. Dioctyl sebacate can be used as a plasticizer to improve the processing performance of polymers, making them easier to shape and mold during processing. It can also improve the flexibility, cold resistance, and durability of wire and cable sheaths, maintaining flexibility even at low temperatures. Silane coupling agents can act as lubricants, reducing the melt viscosity of the polyethylene matrix, improving its fluidity and processing stability, stabilizing extrusion molding, and can also be grafted onto the polymer backbone to modify the polymer. The first silane coupling agent and the second silane coupling agent can undergo a nucleophilic addition reaction, causing the polymer to form a more complex cross-linked network, improving structural strength, and thus enhancing the electrical and mechanical properties of wire and cable sheaths.

[0033] 2. This invention utilizes soft acrylate monomers, hard acrylate monomers, modified hydroxyethyl acrylate, and acrylic acid as comonomers to prepare modified acrylic resin through free radical polymerization under the action of an initiator. The modified hydroxyethyl acrylate incorporates a triazine ring structure with good thermal stability and flame retardant properties, while also possessing a benzene ring structure, exhibiting good hydrophobicity. This imparts excellent thermal stability, water resistance, high-temperature aging resistance, and flame retardant properties to the wire and cable sheath. The modified acrylic resin, when compounded with a polymer matrix and other functional raw materials, undergoes polymer modification during the compounding process. The resulting wire and cable sheath exhibits excellent electrical properties, flexibility, flame retardancy, low-temperature resistance, aging resistance, and mechanical properties.

[0034] 3. The preparation method of the present invention is simple and convenient, and is suitable for large-scale promotion and application. Detailed Implementation

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0036] The reagents, raw materials, instruments, and equipment used in the preferred embodiments of this invention are all commercially available. Example 1

[0037] A low-temperature resistant and flexible wire and cable insulation sheath material, comprising the following raw materials in parts by weight:

[0038] The composition includes 40 parts polyethylene, 50 parts chlorinated polyethylene, 10 parts ethylene propylene diene monomer (EPDM) rubber, 10 parts modified acrylic resin, 4 parts hydroxyl-terminated polybutadiene, 4 parts chlorinated polyethylene elastomer, 4 parts magnesium hydroxide, 2 parts dioctyl sebacate, 2 parts benzamide peroxide, 0.2 parts KH570, and 0.2 parts MPTES. The first and second silane coupling agents can undergo a nucleophilic addition reaction. The modified acrylic resin is prepared by using 3-isocyanate-methylene-3,5,5-trimethylcyclohexyl isocyanate as a bridging agent, which undergoes a nucleophilic addition reaction with hydroxyethyl hexahydrotriazine and hydroxyethyl acrylate.

[0039] The preparation process of the low-temperature resistant and flexible wire and cable insulation sheath material in this embodiment includes the following steps:

[0040] S1. Preparation of modified acrylic resin:

[0041] 1) Add 16 parts of hydroxyethyl hexahydrotriazine and 5 parts of 3-isocyanate-methylene-3,5,5-trimethylcyclohexyl isocyanate to a reactor, stir and mix, then add 0.025 parts of dibutyltin dilaurate, and stir and react at 40°C for 1.5 h. Then add 2.5 parts of hydroxyethyl acrylate, and stir and react at 50°C for another 1.5 h. After the reaction is completed, filter, rotary evaporate and dry to prepare modified hydroxyethyl acrylate.

[0042] 2) Weigh 55 parts by weight of soft acrylate monomer, 15 parts by weight of hard acrylate monomer, 7 parts by weight of modified hydroxyethyl acrylate, 4.5 parts by weight of acrylic acid and 50 parts by weight into a reaction vessel, and place it at 60°C for stirring and preheating for 3 hours.

[0043] 3) Heat the reactor to 70°C, add 0.35 parts of azobisisobutyronitrile initiator, and keep it at this temperature for 1 hour;

[0044] 4) Then add 0.075 parts of platinum catalyst and 7.5 parts of vinyl silicone oil, and complete the addition dropwise within 1 hour. Keep warm for 1 hour, then add initiator and solvent, and complete the addition dropwise within 0.5 hours. Keep warm for 1.5 hours, then cool down and discharge the material to obtain modified acrylic resin.

[0045] S2. Mix polyethylene, chlorinated polyethylene, ethylene propylene rubber, modified acrylic resin, toughening agent, flame retardant, vulcanizing agent, first silane coupling agent and second silane coupling agent according to the weight parts and carry out a one-time mixing. The temperature of the one-time mixing is 180℃ and the time is 10min.

[0046] S3. Then, add hydroxyl-terminated polybutadiene and dioctyl sebacate according to the weight parts, and carry out secondary mixing. The temperature of the secondary mixing is 140℃ and the time is 18min. After the mixing is completed, a wire and cable insulation sheath material with low temperature resistance and flexibility is obtained. Example 2

[0047] A low-temperature resistant and flexible wire and cable insulation sheath material, comprising the following raw materials in parts by weight:

[0048] The composition includes 60 parts polyethylene, 30 parts chlorinated polyethylene, 30 parts EPDM rubber, 20 parts modified acrylic resin, 10 parts hydroxyl-terminated polybutadiene, 10 parts polyethylene octene elastomer, 5 parts aluminum hydroxide, 5 parts antimony trioxide, 6 parts dioctyl sebacate, 6 parts dicumyl peroxide, 0.7 parts KH560, and 0.7 parts KH590. The first and second silane coupling agents can undergo a nucleophilic addition reaction. The modified acrylic resin is prepared by using 3-isocyanate-methylene-3,5,5-trimethylcyclohexyl isocyanate as a bridging agent, which undergoes a nucleophilic addition reaction with hydroxyethyl hexahydrotriazine and hydroxyethyl acrylate.

[0049] The preparation process of the low-temperature resistant and flexible wire and cable insulation sheath material in this embodiment includes the following steps:

[0050] S1. Preparation of modified acrylic resin: Same as in Example 1;

[0051] S2. Mix polyethylene, chlorinated polyethylene, ethylene propylene rubber, modified acrylic resin, toughening agent, flame retardant, vulcanizing agent, first silane coupling agent and second silane coupling agent according to the weight parts and carry out a one-time mixing. The temperature of the one-time mixing is 150℃ and the time is 30min.

[0052] S3. Then, add hydroxyl-terminated polybutadiene and dioctyl sebacate according to the weight parts, and carry out secondary mixing. The temperature of the secondary mixing is 120℃ and the time is 25min. After the mixing is completed, a wire and cable insulation sheath material with low temperature resistance and flexibility is obtained. Example 3

[0053] A low-temperature resistant and flexible wire and cable insulation sheath material, comprising the following raw materials in parts by weight:

[0054] The composition includes 50 parts polyethylene, 40 parts chlorinated polyethylene, 20 parts ethylene propylene diene monomer (EPDM) rubber, 15 parts modified acrylic resin, 7 parts hydroxyl-terminated polybutadiene, 8 parts polyethylene octene co-elastomer, 4 parts antimony trioxide, 4 parts montmorillonite, 4 parts dioctyl sebacate, 4 parts 2,4-di-tert-butyl peroxide, 0.5 parts KH560, and 0.5 parts MPTES. The modified acrylic resin is prepared by a nucleophilic addition reaction between 3-isocyanate-methylene-3,5,5-trimethylcyclohexyl isocyanate as a bridging agent and hydroxyethyl hexahydrotriazine and hydroxyethyl acrylate.

[0055] The preparation process of the low-temperature resistant and flexible wire and cable insulation sheath material in this embodiment includes the following steps:

[0056] S1. Preparation of modified acrylic resin: Same as in Example 1;

[0057] S2. Mix polyethylene, chlorinated polyethylene, ethylene propylene rubber, modified acrylic resin, toughening agent, flame retardant, vulcanizing agent, first silane coupling agent, and second silane coupling agent according to the weight parts and carry out a one-time mixing. The temperature of the one-time mixing is 165℃ and the time is 15min.

[0058] S3. Then, add hydroxyl-terminated polybutadiene and dioctyl sebacate according to the weight parts, and carry out secondary mixing. The temperature of the secondary mixing is 130℃ and the time is 20min. After the mixing is completed, a wire and cable insulation sheath material with low temperature resistance and flexibility is obtained. Example 4

[0059] A low-temperature resistant and flexible wire and cable insulation sheath material, comprising the following raw materials in parts by weight:

[0060] The composition includes 55 parts polyethylene, 45 parts chlorinated polyethylene, 15 parts ethylene propylene diene monomer (EPDM) rubber, 17 parts modified acrylic resin, 8 parts hydroxyl-terminated polybutadiene, 5.5 parts chlorinated paraffin oil, 3 parts aluminum hydroxide, 3 parts antimony trioxide, 3 parts dioctyl sebacate, 3 parts benzamide peroxide, 0.4 parts KH570, and 0.4 parts MPTES. The first and second silane coupling agents can undergo a nucleophilic addition reaction. The modified acrylic resin is prepared by using 3-isocyanate-methylene-3,5,5-trimethylcyclohexyl isocyanate as a bridging agent, which undergoes a nucleophilic addition reaction with hydroxyethyl hexahydrotriazine and hydroxyethyl acrylate.

[0061] The preparation process of the low-temperature resistant and flexible wire and cable insulation sheath material in this embodiment includes the following steps:

[0062] S1. Preparation of modified acrylic resin: Same as in Example 1;

[0063] S2. Mix polyethylene, chlorinated polyethylene, ethylene propylene rubber, modified acrylic resin, toughening agent, flame retardant, vulcanizing agent, first silane coupling agent, and second silane coupling agent according to the weight parts and carry out a one-time mixing. The temperature of the one-time mixing is 160℃ and the time is 20min.

[0064] S3. Then, add hydroxyl-terminated polybutadiene and dioctyl sebacate according to the weight parts, and carry out secondary mixing. The temperature of the secondary mixing is 130℃ and the time is 15min. After the mixing is completed, a wire and cable insulation sheath material with low temperature resistance and flexibility is obtained. Example 5

[0065] A low-temperature resistant and flexible wire and cable insulation sheath material, comprising the following raw materials in parts by weight:

[0066] The composition includes 45 parts polyethylene, 35 parts chlorinated polyethylene, 25 parts EPDM rubber, 13 parts modified acrylic resin, 6 parts hydroxyl-terminated polybutadiene, 6 parts polyethylene octene elastomer, 3 parts antimony trioxide, 2 parts montmorillonite, 5 parts dioctyl sebacate, 5 parts 2,4-di-tert-butyl peroxide, 0.5 parts KH560, and 0.5 parts KH590. The first and second silane coupling agents can undergo a nucleophilic addition reaction. The modified acrylic resin is prepared by using 3-isocyanate-methylene-3,5,5-trimethylcyclohexyl isocyanate as a bridging agent, which undergoes a nucleophilic addition reaction with hydroxyethyl hexahydrotriazine and hydroxyethyl acrylate.

[0067] The preparation process of the low-temperature resistant and flexible wire and cable insulation sheath material in this embodiment includes the following steps:

[0068] S1. Preparation of modified acrylic resin: Same as in Example 1;

[0069] S2. Mix polyethylene, chlorinated polyethylene, ethylene propylene rubber, modified acrylic resin, toughening agent, flame retardant, vulcanizing agent, first silane coupling agent, and second silane coupling agent according to the weight parts and carry out a one-time mixing. The temperature of the one-time mixing is 170℃ and the time is 20min.

[0070] S3. Then, add hydroxyl-terminated polybutadiene and dioctyl sebacate according to the weight parts, and carry out secondary mixing. The temperature of the secondary mixing is 140°C and the time is 15 minutes. After the mixing is completed, the low-temperature resistant and flexible wire and cable insulation sheath material is obtained.

[0071] Comparative Example 1

[0072] Without the addition of modified acrylic resin, the rest is the same as in Example 1.

[0073] Comparative Example 2

[0074] Without the first silane coupling agent, the rest is the same as in Example 1.

[0075] Comparative Example 3

[0076] Without the addition of a second silane coupling agent, the rest is the same as in Example 1.

[0077] Comparative Example 4

[0078] Without the addition of hydroxyl-terminated polybutadiene, the rest is the same as in Example 1.

[0079] The performance of the insulating sheaths obtained in Examples 1-5 and Comparative Examples 1-4 was tested, and the results are listed in Table 1.

[0080] 1. Low-temperature bending performance test shall be conducted in accordance with GB / T 2951.14-2008 standard.

[0081] 2. Mechanical property tests shall be conducted in accordance with GB / T2951.11-2008 standard.

[0082] Table 1

[0083]

[0084] As shown in Table 1, compared with Comparative Examples 1-4, the wire and cable sheath provided by this invention exhibits excellent low-temperature performance and flexibility, with a low low-temperature impact embrittlement temperature, high tensile strength, and high elongation at break. Modified acrylic resin has the greatest impact on the flexibility of the wire and cable sheath, followed by hydroxyl-terminated polybutadiene; hydroxyl-terminated polybutadiene has the greatest impact on the low-temperature performance of the wire and cable sheath, followed by modified acrylic resin. This indicates that modified acrylic resin and hydroxyl-terminated polybutadiene have a significant impact on the structure and performance of the wire and cable sheath. Silane coupling agents also affect the low-temperature performance and flexibility of the wire and cable sheath; only by adding both the first and second silane coupling agents simultaneously can a high-performance wire and cable sheath be obtained.

[0085] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-temperature resistant and flexible wire and cable insulation sheath material, characterized in that, Including the following parts by weight of raw materials: Polyethylene 40-60 parts, chlorinated polyethylene 30-50 parts, ethylene propylene rubber 10-30 parts, modified acrylic resin 10-20 parts, hydroxyl-terminated polybutadiene 4-10 parts, toughening agent 4-10 parts, flame retardant 4-10 parts, dioctyl sebacate 2-6 parts, vulcanizing agent 2-6 parts, first silane coupling agent 0.2-0.7 parts, second silane coupling agent 0.2-0.7 parts; The first silane coupling agent and the second silane coupling agent can undergo a nucleophilic addition reaction.

2. The low-temperature resistant and flexible wire and cable insulation sheath material according to claim 1, characterized in that, The ethylene propylene rubber includes at least one of binary ethylene propylene rubber, modified binary ethylene propylene rubber, and ternary ethylene propylene rubber.

3. The low-temperature resistant and flexible wire and cable insulation sheath material according to claim 1, characterized in that, The modified acrylic resin comprises the following raw materials in parts by weight: 50-60 parts of soft acrylate monomer, 10-20 parts of hard acrylate monomer, 5-10 parts of modified hydroxyethyl acrylate, 3-6 parts of acrylic acid, 5-10 parts of vinyl silicone oil, 0.2-1 parts of initiator, 0.05-0.1 parts of platinum catalyst, and 50-70 parts of solvent. The modified hydroxyethyl acrylate is prepared by a nucleophilic addition reaction between 3-isocyanate-methylene-3,5,5-trimethylcyclohexyl isocyanate as a bridging agent and hydroxyethyl hexahydrotriazine and hydroxyethyl acrylate.

4. The low-temperature resistant and flexible wire and cable insulation sheath material according to claim 1, characterized in that, The toughening agent includes at least one of chlorinated polyethylene elastomer, polyethylene octene co-elastomer, cellulose, and chlorinated paraffin oil; The vulcanizing agent includes at least one of benzamide peroxide, dicumyl peroxide, dicumyl hydrogen peroxide, and 2,4-di-tert-butyl peroxide.

5. The low-temperature resistant and flexible wire and cable insulation sheath material according to claim 1, characterized in that, The flame retardant includes at least one of magnesium hydroxide, aluminum hydroxide, antimony trioxide, silicon dioxide, montmorillonite, and talc.

6. The low-temperature resistant and flexible wire and cable insulation sheath material according to claim 1, characterized in that, The first silane coupling agent includes at least one of KH570 and KH560; The second silane coupling agent includes at least one of MPTES and KH590.

7. The preparation process of a low-temperature resistant and flexible wire and cable insulation sheath material according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Preparation of modified acrylic resin: 1) Weigh the soft acrylate monomer, hard acrylate monomer, modified hydroxyethyl acrylate, acrylic acid and part of the solvent according to the weight parts and put them into the reaction vessel, and stir and preheat at 55~65℃ for 2~4h. 2) Heat the reactor to 65~75℃, add a portion of the initiator, and maintain the temperature for 0.5~2 hours; 3) Then add platinum catalyst and vinyl silicone oil, complete the addition within 1 hour, keep warm for 0.5~2 hours, then add initiator and solvent, complete the addition within 0.5 hours, keep warm for 1~2 hours, cool down, and discharge to prepare modified acrylic resin; S2. Mix polyethylene, chlorinated polyethylene, ethylene propylene rubber, modified acrylic resin, toughening agent, flame retardant, vulcanizing agent, first silane coupling agent, and second silane coupling agent for one mixing process. S3. Then add hydroxyl-terminated polybutadiene and dioctyl sebacate, and perform secondary mixing. After mixing, the low-temperature resistant and flexible wire and cable insulation sheath material is obtained.

8. The preparation process of a low-temperature resistant and flexible wire and cable insulation sheath material according to claim 7, characterized in that, In step S1, the modified hydroxyethyl acrylate is prepared as follows: hydroxyethyl hexahydrotriazine and 3-isocyanate-methylene-3,5,5-trimethylcyclohexyl isocyanate are added to a reactor, and after stirring and mixing, dibutyltin dilaurate is added. The mixture is stirred and reacted at 35-45°C for 1-2 hours. Then, hydroxyethyl acrylate is added, and the mixture is stirred and reacted at 45-55°C for another 1-2 hours. After the reaction is completed, the mixture is filtered, rotary evaporated, and dried to obtain the modified hydroxyethyl acrylate.

9. The preparation process of a low-temperature resistant and flexible wire and cable insulation sheath material according to claim 7, characterized in that, In step S2, the temperature of the first mixing is 150-180℃ and the time is 10-30 minutes.

10. The preparation process of a low-temperature resistant and flexible wire and cable insulation sheath material according to claim 7, characterized in that, In step S3, the temperature of the secondary mixing is 120-150℃ and the time is 10-30 minutes.

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