High-strength low-temperature-resistant three-core flexible cable and preparation process thereof

Abstract

The application relates to the cable field and particularly discloses a high-strength low-temperature-resistant three-core flexible cable and a preparation process thereof; the preparation process comprises the following steps: S1, taking copper wires, performing wire drawing, annealing and twisting to form a conductor, spraying insulating paint, twisting after drying, and obtaining a core material; S2, covering an insulating layer material on the core material through an extrusion molding process to obtain an insulating wire core; S3, wrapping a sheath material on the three twisted insulating wire core layers, spraying an initiator solution on the sheath material, coating anti-freezing adhesive paint, obtaining an anti-freezing adhesive coating, heating and solidifying, and obtaining the high-strength low-temperature-resistant three-core flexible cable; the preparation of the sheath material comprises the following steps: taking a ternary ethylene-propylene rubber and a methyl vinyl silicone rubber, mixing, adding silicon dioxide, modified zinc oxide, stearic acid and an antioxidant, mixing, adding a modifier A, sulfur and di-tert-butyl peroxide isopropyl benzene, cutting and thinning, and obtaining the sheath material.

Description

Technical Field

[0001] This invention relates to the field of cables, and specifically discloses a high-strength, low-temperature resistant three-core flexible cable and its manufacturing process. Background Technology

[0002] Cables have a wide range of applications, and the requirements for cables vary depending on the region, climate, and application field. In cold regions, the outer sheath of ordinary cables is prone to cracking. Therefore, cables are required to have high strength and low temperature resistance.

[0003] Ethylene propylene diene monomer (EPDM) rubber has a glass transition temperature below -50℃ and good low-temperature resistance, making it commonly used in the production of cold-resistant materials. However, it is often difficult to balance strength, elasticity, and low-temperature resistance simultaneously. Therefore, researching a high-strength, low-temperature resistant three-core flexible cable and its manufacturing process is of great significance. Summary of the Invention

[0004] The purpose of this invention is to provide a high-strength, low-temperature resistant three-core flexible cable and its manufacturing process, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A manufacturing process for a high-strength, low-temperature resistant three-core flexible cable includes the following steps: S1: Take copper wire, draw it, anneal it, strand it into a conductor, spray it with insulating varnish, dry it, and then strand it to obtain the core material;

[0007] S2: The insulating layer material is coated onto the core material through an extrusion molding process to obtain the insulated wire core; the three insulated wire cores are twisted together to obtain the core layer;

[0008] S3: Wrap the core layer with the sheath material by extrusion to obtain a sheath layer with a thickness of 1-2 mm; spray an initiator solution on the outside of the sheath layer, coat it with an antifreeze adhesive coating to obtain an antifreeze adhesive coating; heat and cure to obtain a high-strength, low-temperature resistant three-core flexible cable;

[0009] The preparation of the sheath material includes the following steps:

[0010] (i) Modified zinc oxide is obtained by modifying zinc oxide with a silane coupling agent;

[0011] (ii) Take 5-neoceneresorcinol, 4,5-difluorophthalic acid, hydroxyl-terminated methyl vinyl silicone oil, and sulfuric acid, and heat and stir to react to obtain modifier A;

[0012] (III) Take EPDM rubber and methyl vinyl silicone rubber, mix them, add silica, modified zinc oxide, stearic acid and antioxidant, mix them, add modifier A, sulfur and di-tert-butyl peroxide isopropylbenzene, cut and pass through to obtain sheath material.

[0013] Preferably, the modifier A comprises the following raw materials in parts by weight: 2-3 parts 5-cosylresorcinol, 1-2 parts 4,5-difluorophthalic acid, 5-10 parts hydroxyl-terminated methyl vinyl silicone oil, and 0.02-0.03 parts sulfuric acid; the sheath material comprises the following raw materials in parts by weight: 30 parts methyl vinyl silicone rubber, 60-70 parts ethylene propylene diene monomer (EPDM) rubber, 3-8 parts silica, 20-30 parts modified zinc oxide, 1-2 parts stearic acid, 2-5 parts antioxidant, 1-2 parts sulfur, 1-2 parts di-tert-butyl peroxide isopropylbenzene, and 8-15 parts modifier A.

[0014] Preferably, the preparation of the modified zinc oxide includes the following steps: taking zinc oxide, water, ethanol, and silane coupling agent, stirring, filtering to obtain the solid, and drying to obtain modified zinc oxide;

[0015] The modified zinc oxide comprises the following raw materials, by mass parts: 10 parts zinc oxide, 50-60 parts water, 50-60 parts ethanol, and 2-3 parts silane coupling agent; the silane coupling agent is obtained by combining sulfur-containing silane coupling agent and vinyl silane coupling agent in a mass ratio of (1-3):1.

[0016] Preferably, the preparation of the antifreeze adhesive coating includes the following steps: S1: Take 5-neoceneresorcinol, hydroxyl-terminated methyl vinyl silicone oil, and sulfuric acid, heat and stir to react, and obtain modifier B;

[0017] S3: Take hydrophobic fumed silica and xylene, stir, add EPDM rubber, stir, add modifier B and modifier A, stir, and obtain antifreeze adhesive coating.

[0018] Preferably, the modifier B comprises the following raw materials, by weight: 1-2 parts 5-cosylresorcinol, 30-50 parts hydroxyl-terminated methyl vinyl silicone oil, and 0.03-0.05 parts sulfuric acid; the antifreeze coating comprises the following raw materials, by weight: 1-2 parts hydrophobic fumed silica, 50-100 parts xylene, 10-15 parts ethylene propylene diene monomer (EPDM) rubber, 15-20 parts modifier B, and 1-2 parts modifier A.

[0019] Preferably, the initiator solution is a methanol solution of azobisisobutyronitrile, with the amount of azobisisobutyronitrile added being 15 wt%; the spraying amount of the initiator solution is 10-15 g / m². 2 The thickness of the antifreeze coating is 0.2 to 0.5 mm.

[0020] Preferably, in step S3, the heating curing conditions are: heating and curing at 65-70°C for 1-2 hours.

[0021] Preferably, in step S3, the heating curing conditions are: heating and curing at 70°C for 2 hours.

[0022] Preferably, the extrusion process of the sheath material is as follows: temperature 300-350℃, pressure 0.5-0.8MPa.

[0023] Preferably, the extrusion process of the sheath material is as follows: temperature 340℃, pressure 0.7MPa.

[0024] Preferably, the insulating layer material comprises the following raw materials in parts by weight: 15-20 parts butyl rubber, 15-20 parts ethylene propylene diene monomer (EPDM) rubber, 3-5 parts calcium carbonate, 3-5 parts silicon dioxide, 20-30 parts polyvinyl chloride, 5-10 parts plasticizer, 10-15 parts iron oxide, and 2-3 parts paraffin oil.

[0025] Preferably, the insulating layer material comprises the following raw materials in parts by weight: 20 parts butyl rubber, 20 parts EPDM rubber, 5 parts calcium carbonate, 5 parts silicon dioxide, 20 parts polyvinyl chloride, 8 parts plasticizer, 15 parts iron oxide, and 2 parts paraffin oil.

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The sheath material of the cable of this application includes methyl vinyl silicone rubber, ethylene propylene diene monomer (EPDM) rubber, modified zinc oxide, and modifier A; EPDM rubber has good elasticity and excellent low-temperature resistance, weather resistance, chemical corrosion resistance, and electrical insulation; the addition of methyl vinyl silicone rubber can further improve the low-temperature resistance of EPDM rubber; the modified zinc oxide prepared in this application is modified by sulfur-containing silane coupling agent and vinyl silane coupling agent, wherein sulfur and vinyl participate in rubber vulcanization, improve the dispersibility of zinc oxide in rubber, increase the degree of rubber crosslinking, and enhance the compatibility between methyl vinyl silicone rubber and EPDM rubber;

[0027] Modifier A was prepared using 5-cuicoalkylresorcinol, 4,5-difluorophthalic acid, and hydroxyl-terminated methyl vinyl silicone oil. The long alkyl chain in 5-cuicoalkylresorcinol helps improve tensile properties and cold resistance; the fluorine in 4,5-difluorophthalic acid also helps improve cold resistance; the addition of hydroxyl-terminated methyl vinyl silicone oil can improve weather resistance and flexibility, but too much should not be introduced, otherwise it will lead to performance degradation and processing difficulties; the long alkyl chain in modifier A has good compatibility with EPDM rubber, and the hydroxyl-terminated methyl vinyl silicone oil has good compatibility with methyl vinyl silicone rubber. Therefore, the addition of modifier A also improves the compatibility between the two rubbers.

[0028] The sheath layer of this invention also includes an antifreeze adhesive coating, comprising hydrophobic fumed silica, EPDM rubber, modifier B, and modifier A. Modifier A improves the tensile strength and cold resistance of the coating. Modifier B is prepared from 5-monoalkylresorcinol and hydroxyl-terminated methyl vinyl silicone oil, which has good lubricity and, upon addition, provides the coating with excellent de-icing ability. The hydrophobic fumed silica is waterproof and anti-icing, and its porous structure can adsorb the modifier, providing good storage capacity and greatly enhancing the durability of the coating. Both the sheath layer and the antifreeze adhesive coating contain vinyl groups. The initiator solution is sprayed first, followed by the antifreeze adhesive coating and then heated for curing, which improves the crosslinking degree of the sheath layer and the coating, and also improves the adhesion between the sheath layer and the antifreeze adhesive coating. Detailed Implementation

[0029] The following are preferred embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. For those skilled in the art, all other embodiments obtained by those skilled in the art without creative effort without departing from the principles of the embodiments of the present invention are within the scope of protection of the present invention.

[0030] Unless otherwise specified, all the following quantities are parts by weight.

[0031] S1: Take copper wire, draw it, anneal it, and twist it into a conductor with an outer diameter of 0.2mm. Spray it with insulating varnish and twist it according to the conductor structure of 1+6+12+18, that is, twist it with 7 conductors inside and 30 conductors outside to obtain the core material.

[0032] S2: The insulating layer material is coated onto the core material through an extrusion molding process to obtain the insulated wire core; the three insulated wire cores are twisted together to obtain the core layer;

[0033] S3: Wrap the core layer with the sheath material by extrusion to obtain a 2mm sheath layer. Spray an initiator solution onto the outside of the sheath layer at a rate of 12g / m². 2 Apply an antifreeze adhesive coating to a thickness of 0.3 mm to obtain an antifreeze adhesive coating; heat-cur to obtain a high-strength, low-temperature resistant three-core flexible cable;

[0034] Example 1: Preparation of Modifier A: Take 3 parts of 5-cosylresorcinol, 2 parts of 4,5-difluorophthalic acid, 8 parts of hydroxyl-terminated methyl vinyl silicone oil, and 0.03 parts of sulfuric acid, heat to 120°C, and stir for 6 hours to obtain Modifier A;

[0035] Preparation of modifier B: Take 2 parts of 5-neoceneresorcinol, 450 parts of hydroxyl-terminated methyl vinyl silicone oil, and 0.05 parts of sulfuric acid, heat to 140℃, stir and react for 5 hours to obtain modifier B;

[0036] Preparation of antifreeze adhesive coating: Take 1.5 parts of hydrophobic fumed silica and 100 parts of xylene, stir for 20 min, add 12 parts of EPDM rubber, stir at 90℃ for 1 h, add 15 parts of modifier B and 1.5 parts of modifier A, stir at 70℃ for 3 h to obtain antifreeze adhesive coating.

[0037] Preparation of sheath material: S1: Take 10 parts of zinc oxide, add 60 parts of water, 50 parts of ethanol, and 3 parts of silane coupling agent (sulfur-containing silane coupling agent and vinyl silane coupling agent with a mass ratio of 2:1), stir at 60°C for 5 hours, filter to obtain solid, dry, and obtain modified zinc oxide.

[0038] S2: Add EPDM rubber and methyl vinyl silicone rubber to a two-roll mill, adjust the roll gap to 0.8mm, set the front roll temperature to 35℃ and the rear roll temperature to 25℃, and plasticize until it completely covers the front roll. Mix for 2 minutes, then add silica, modified zinc oxide, stearic acid, antioxidant RD, and antioxidant MB. Mix for 2 minutes, then add modifier A, sulfur, and di-tert-butyl peroxide isopropylbenzene. Cut the material 3 times and pass it through a thin tube 6 times to obtain the sheath material.

[0039] The sheath material comprises the following raw materials, by weight: 30 parts methyl vinyl silicone rubber, 70 parts ethylene propylene diene monomer (EPDM) rubber, 5 parts silica, 25 parts modified zinc oxide, 2 parts stearic acid, 2 parts antioxidant RD, 2 parts antioxidant MB, 2 parts sulfur, 1 part di-tert-butyl peroxide isopropylbenzene, and 10 parts modifier A.

[0040] Example 2: Preparation of Modifier A: Take 2 parts of 5-cosylresorcinol, 1 part of 4,5-difluorophthalic acid, 10 parts of hydroxyl-terminated methyl vinyl silicone oil, and 0.03 parts of sulfuric acid, heat to 120°C, and stir for 6 hours to obtain Modifier A;

[0041] Preparation of modifier B: Take 2 parts of 5-neoceneresorcinol, 30 parts of hydroxyl-terminated methyl vinyl silicone oil, and 0.05 parts of sulfuric acid, heat to 140℃, and stir for 5 hours to obtain modifier B;

[0042] Preparation of antifreeze adhesive coating: Take 2 parts of hydrophobic fumed silica and 100 parts of xylene, stir for 20 min, add 15 parts of EPDM rubber, stir at 90℃ for 1 h, add 20 parts of modifier B and 1 part of modifier A, stir at 70℃ for 3 h to obtain antifreeze adhesive coating.

[0043] Preparation of sheath material: S1: Take 10 parts of zinc oxide, add 60 parts of water, 60 parts of ethanol, and 2 parts of silane coupling agent (sulfur-containing silane coupling agent and vinyl silane coupling agent with a mass ratio of 1:1), stir at 60°C for 5 hours, filter to obtain solid, dry, and obtain modified zinc oxide.

[0044] S2: Add EPDM rubber and methyl vinyl silicone rubber to a two-roll mill, adjust the roll gap to 0.8mm, set the front roll temperature to 35℃ and the rear roll temperature to 25℃, and plasticize until it completely covers the front roll. Mix for 2 minutes, then add silica, modified zinc oxide, stearic acid, antioxidant RD, and antioxidant MB. Mix for 2 minutes, then add modifier A, sulfur, and di-tert-butyl peroxide isopropylbenzene. Cut the material 3 times and pass it through a thin tube 6 times to obtain the sheath material.

[0045] The sheath material comprises the following raw materials, by weight: 30 parts methyl vinyl silicone rubber, 70 parts ethylene propylene diene monomer (EPDM) rubber, 5 parts silica, 25 parts modified zinc oxide, 2 parts stearic acid, 2 parts antioxidant RD, 2 parts antioxidant MB, 1 part sulfur, 2 parts di-tert-butyl peroxide isopropylbenzene, and 10 parts modifier A.

[0046] Example 3: Preparation of Modifier A: Take 2 parts of 5-cosylresorcinol, 1 part of 4,5-difluorophthalic acid, 5 parts of hydroxyl-terminated methyl vinyl silicone oil, and 0.03 parts of sulfuric acid, heat to 120°C, and stir for 6 hours to obtain Modifier A;

[0047] Preparation of modifier B: Take 2 parts of 5-neoceneresorcinol, 50 parts of hydroxyl-terminated methyl vinyl silicone oil, and 0.05 parts of sulfuric acid, heat to 140℃, and stir for 5 hours to obtain modifier B;

[0048] Preparation of antifreeze adhesive coating: Take 1 part of hydrophobic fumed silica and 100 parts of xylene, stir for 20 min, add 10 parts of EPDM rubber, stir at 90℃ for 1 h, add 15 parts of modifier B and 2 parts of modifier A, stir at 70℃ for 3 h to obtain antifreeze adhesive coating.

[0049] Preparation of sheath material: S1: Take 10 parts of zinc oxide, add 50 parts of water, 50 parts of ethanol, and 2 parts of silane coupling agent (sulfur-containing silane coupling agent and vinyl silane coupling agent with a mass ratio of 3:1), stir at 60°C for 5 hours, filter to obtain solid, dry, and obtain modified zinc oxide.

[0050] S2: Add EPDM rubber and methyl vinyl silicone rubber to a two-roll mill, adjust the roll gap to 0.8mm, set the front roll temperature to 35℃ and the rear roll temperature to 25℃, and plasticize until it completely covers the front roll. Mix for 2 minutes, then add silica, modified zinc oxide, stearic acid, antioxidant RD, and antioxidant MB. Mix for 2 minutes, then add modifier A, sulfur, and di-tert-butyl peroxide isopropylbenzene. Cut the material 3 times and pass it through a thin tube 6 times to obtain the sheath material.

[0051] The sheath material comprises the following raw materials, by weight: 30 parts methyl vinyl silicone rubber, 70 parts ethylene propylene diene monomer (EPDM) rubber, 5 parts silica, 30 parts modified zinc oxide, 2 parts stearic acid, 2 parts antioxidant RD, 2 parts antioxidant MB, 1 part sulfur, 1 part di-tert-butyl peroxide isopropylbenzene, and 8 parts modifier A.

[0052] Comparative Example 1 (the amount of each raw material added to modifier A was changed, and the rest of the methods and steps were the same as in Example 1): Preparation of modifier A: Take 2 parts of 5-cosylresorcinol, 1 part of 4,5-difluorophthalic acid, 15 parts of hydroxyl-terminated methyl vinyl silicone oil, and 0.03 parts of sulfuric acid, heat to 120°C, stir and react for 6 hours to obtain modifier A;

[0053] Preparation of modifier B: Take 2 parts of 5-neoceneresorcinol, 450 parts of hydroxyl-terminated methyl vinyl silicone oil, and 0.05 parts of sulfuric acid, heat to 140℃, stir and react for 5 hours to obtain modifier B;

[0054] Preparation of antifreeze adhesive coating: Take 1.5 parts of hydrophobic fumed silica and 100 parts of xylene, stir for 20 min, add 12 parts of EPDM rubber, stir at 90℃ for 1 h, add 15 parts of modifier B and 1.5 parts of modifier A, stir at 70℃ for 3 h to obtain antifreeze adhesive coating.

[0055] Preparation of sheath material: S1: Take 10 parts of zinc oxide, add 60 parts of water, 50 parts of ethanol, and 3 parts of silane coupling agent (sulfur-containing silane coupling agent and vinyl silane coupling agent with a mass ratio of 2:1), stir at 60°C for 5 hours, filter to obtain solid, dry, and obtain modified zinc oxide.

[0056] S2: Add EPDM rubber and methyl vinyl silicone rubber to a two-roll mill, adjust the roll gap to 0.8mm, set the front roll temperature to 35℃ and the rear roll temperature to 25℃, and plasticize until it completely covers the front roll. Mix for 2 minutes, then add silica, modified zinc oxide, stearic acid, antioxidant RD, and antioxidant MB. Mix for 2 minutes, then add modifier A, sulfur, and di-tert-butyl peroxide isopropylbenzene. Cut the material 3 times and pass it through a thin tube 6 times to obtain the sheath material.

[0057] The sheath material comprises the following raw materials, by weight: 30 parts methyl vinyl silicone rubber, 70 parts ethylene propylene diene monomer (EPDM) rubber, 5 parts silica, 25 parts modified zinc oxide, 2 parts stearic acid, 2 parts antioxidant RD, 2 parts antioxidant MB, 2 parts sulfur, 1 part di-tert-butyl peroxide isopropylbenzene, and 10 parts modifier A.

[0058] Comparative Example 2 (no zinc oxide modification, the rest of the methods and steps are the same as in Example 1): Preparation of Modifier A: Take 3 parts of 5-cosylresorcinol, 2 parts of 4,5-difluorophthalic acid, 8 parts of hydroxyl-terminated methyl vinyl silicone oil, and 0.03 parts of sulfuric acid, heat to 120°C, stir and react for 6 hours to obtain Modifier A;

[0059] Preparation of modifier B: Take 2 parts of 5-neoceneresorcinol, 450 parts of hydroxyl-terminated methyl vinyl silicone oil, and 0.05 parts of sulfuric acid, heat to 140℃, stir and react for 5 hours to obtain modifier B;

[0060] Preparation of antifreeze adhesive coating: Take 1.5 parts of hydrophobic fumed silica and 100 parts of xylene, stir for 20 min, add 12 parts of EPDM rubber, stir at 90℃ for 1 h, add 15 parts of modifier B and 1.5 parts of modifier A, stir at 70℃ for 3 h to obtain antifreeze adhesive coating.

[0061] Preparation of sheath material: Add EPDM rubber and methyl vinyl silicone rubber to a two-roll mill, adjust the roll gap to 0.8 mm, set the front roll temperature to 35°C and the rear roll temperature to 25°C, and plasticize until it completely covers the front roll. Mix for 2 min, add silica, zinc oxide, stearic acid, antioxidant RD, and antioxidant MB, and mix for 2 min. Add modifier A, sulfur, and di-tert-butyl peroxide isopropylbenzene. Cut 3 times and pass through a thin tube 6 times to obtain the sheath material.

[0062] The sheath material comprises the following raw materials, by weight: 30 parts methyl vinyl silicone rubber, 70 parts ethylene propylene diene monomer (EPDM) rubber, 5 parts silica, 25 parts modified zinc oxide, 2 parts stearic acid, 2 parts antioxidant RD, 2 parts antioxidant MB, 2 parts sulfur, 1 part di-tert-butyl peroxide isopropylbenzene, and 10 parts modifier A.

[0063] Comparative Example 3 (no initiator solution is sprayed on the outside of the sheath layer, and the other methods and steps are the same as in Example 1): S1: Take copper wire, draw it, anneal it, and twist it into a conductor with an outer diameter of 0.2 mm. Spray it with insulating varnish and twist it according to the conductor structure of 1+6+12+18, that is, twist it with 7 conductors inside and 30 conductors outside to obtain the core material.

[0064] S2: The insulating layer material is coated onto the core material through an extrusion molding process to obtain an insulated wire core;

[0065] S3: Wrap the sheath material around the three stranded insulated cores to obtain a 2mm sheath layer, coat it with an antifreeze adhesive coating with a thickness of 0.3mm to obtain an antifreeze adhesive coating; heat and cure to obtain a high-strength, low-temperature resistant three-core flexible cable.

[0066] Comparative Example 4 (the amount of each raw material added to the antifreeze adhesive coating was changed, and the rest of the methods and steps were the same as in Example 1): Preparation of Modifier A: Take 3 parts of 5-cosylresorcinol, 2 parts of 4,5-difluorophthalic acid, 8 parts of hydroxyl-terminated methyl vinyl silicone oil, and 0.03 parts of sulfuric acid, heat to 120°C, stir and react for 6 hours to obtain Modifier A;

[0067] Preparation of modifier B: Take 2 parts of 5-neoceneresorcinol, 450 parts of hydroxyl-terminated methyl vinyl silicone oil, and 0.05 parts of sulfuric acid, heat to 140℃, stir and react for 5 hours to obtain modifier B;

[0068] Preparation of antifreeze adhesive coating: Take 0.5 parts of hydrophobic fumed silica and 100 parts of xylene, stir for 20 min, add 12 parts of EPDM rubber, stir at 90℃ for 1 h, add 10 parts of modifier B and 5.5 parts of modifier A, stir at 70℃ for 3 h to obtain antifreeze adhesive coating.

[0069] Preparation of sheath material: S1: Take 10 parts of zinc oxide, add 60 parts of water, 50 parts of ethanol, and 3 parts of silane coupling agent (sulfur-containing silane coupling agent and vinyl silane coupling agent with a mass ratio of 2:1), stir at 60°C for 5 hours, filter to obtain solid, dry, and obtain modified zinc oxide.

[0070] S2: Add EPDM rubber and methyl vinyl silicone rubber to a two-roll mill, adjust the roll gap to 0.8mm, set the front roll temperature to 35℃ and the rear roll temperature to 25℃, and plasticize until it completely covers the front roll. Mix for 2 minutes, then add silica, modified zinc oxide, stearic acid, antioxidant RD, and antioxidant MB. Mix for 2 minutes, then add modifier A, sulfur, and di-tert-butyl peroxide isopropylbenzene. Cut the material 3 times and pass it through a thin tube 6 times to obtain the sheath material.

[0071] The sheath material comprises the following raw materials, by weight: 30 parts methyl vinyl silicone rubber, 70 parts ethylene propylene diene monomer (EPDM) rubber, 5 parts silica, 25 parts modified zinc oxide, 2 parts stearic acid, 2 parts antioxidant RD, 2 parts antioxidant MB, 2 parts sulfur, 1 part di-tert-butyl peroxide isopropylbenzene, and 10 parts modifier A.

[0072] Unless otherwise specified, the experimental methods used in the above embodiments are conventional methods; the raw materials used, unless otherwise specified, are all commercially available, and their sources are as follows: 5-Cephalodecylresorcinol (CAS: 70110-59-7); 4,5-Difluorophthalic acid (CAS: 18959-31-4); hydroxyl-terminated methyl vinyl silicone oil (IOTA). 1203V (Anhui Aiyota Silicone Oil Co., Ltd.); Sulfuric acid (C0680150277, AR, Nanjing Reagent); Xylene (CAS: 1330-20-7); EPDM rubber (Dow 660); Zinc oxide (YM-ZnO-02, Yumu Nano); Ethanol (CAS: 64-17-5); Sulfur-containing silane coupling agent (Si69, Forsmann); Vinyl silane coupling agent (CAS: 2768-02-7); Methyl vinyl silicone rubber (Karnos, 8598479); Silica (ML-SiO2-M501, Zhejiang Manli Nanotechnology Co., Ltd.); Stearic acid (S30473, Shanghai Yuanye); Antioxidant RD (S97687, Shanghai Yuanye), Antioxidant MB (S 48637 (Shanghai Yuanye); Sulfur (CAS: 7704-34-9, AR, Da Mao); Di-tert-butyl peroxide isopropylbenzene (DCP, Jinan Guochen Taifu Chemical Co., Ltd.); Butyl rubber (GA5334, Hubei Guangao Biotechnology Co., Ltd.); Polyvinyl chloride (S51649, Shanghai Yuanye); Plasticizer (Nujol166, Jinan Hongteng Weiye New Material Co., Ltd.); Insulating varnish (AC-43, Feng Luodolf); Iron oxide (S24050, Shanghai Yuanye); Paraffin oil (Sunpar2280, Qingdao Hengtai New Material Technology Co., Ltd.); Calcium carbonate (KL-5, Guangxi Hezhou Kelong Powder Co., Ltd.); Hydrophobic fumed silica (HB-139, Hubei Huifu Nanomaterials).

[0073] Experiment: High-strength, low-temperature resistant three-core flexible cables prepared in Examples 1-3 and Comparative Examples 1-4 were used; (1) Tensile performance was tested according to GB / T1040.1-2018 standard; (2) Low-temperature resistance test was conducted on the sheath materials prepared in Examples 1-3 and Comparative Examples 1-4 according to GB / T7759.2-2014 standard, and the temperature at which the sheath material shrinks by 10% was tested; (3) The method in Section 2.3.2 of the paper "Preparation and Performance Study of Durable Antifreeze Adhesive Composite EPDM Coating_Tang Jian" was used to keep the temperature at -20℃ and test the adhesion strength of ice with an SF-200 force gauge, and the sheath material without antifreeze adhesive coating was used as Comparative Example 5; Adhesion strength = adhesion force / ice area; Specific data are shown in the table below;

[0074]

[0075]

[0076] Conclusions: Comparative Example 1, by changing the amount of each raw material added to modifier A, resulted in a higher amount of hydroxyl-terminated methyl vinyl silicone oil, leading to a decrease in performance and an increase in processing difficulty; Comparative Example 2, without modification of zinc oxide, resulted in a decrease in performance due to changes in crosslinking degree and compatibility; Comparative Example 3, without spraying the initiator solution, had performance inferior to the examples; Comparative Example 4, by changing the amount of each raw material added to the antifreeze adhesive coating, reduced the amount of hydrophobic fumed silica and modifier B, demonstrating the importance of controlling the amount added; In summary, this invention provides a high-strength, low-temperature resistant three-core flexible cable and its preparation method, resulting in a cable with good tensile strength and low-temperature resistance, suitable for use under low-temperature conditions.

[0077] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the spirit and principles of the present invention and within the technical scope disclosed in this application should be included within the scope of protection of this application. Where there is no conflict, the embodiments and features described in the embodiments of this application can be combined with each other. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A manufacturing process for a high-strength, low-temperature resistant three-core flexible cable, characterized in that: Includes the following steps: S1: Take copper wire, draw it, anneal it, and strand it into a conductor. Spray it with insulating varnish, dry it, and then strand it together to obtain the core material. S2: The insulating layer material is coated onto the core material through an extrusion molding process to obtain the insulated wire core; the three insulated wire cores are twisted together to obtain the core layer; S3: The sheath material is wrapped around the core layer by extrusion to obtain the sheath layer; an initiator solution is sprayed on the outside of the sheath layer, and an antifreeze adhesive coating is applied to obtain the antifreeze adhesive coating layer; Heating and curing yields a high-strength, low-temperature resistant three-core flexible cable; The preparation of the sheath material includes the following steps: Step 1: Modify zinc oxide with a silane coupling agent to obtain modified zinc oxide; Step 2: Take 5-hexadecylresorcinol, 4,5-difluorophthalic acid, hydroxyl-terminated methyl vinyl silicone oil, and sulfuric acid, heat and stir to react, and obtain modifier A; Step 3: Take EPDM rubber and methyl vinyl silicone rubber, mix them, add silica, modified zinc oxide, stearic acid and antioxidant, mix them, add modifier A, sulfur and di-tert-butyl peroxide isopropylbenzene, cut and pass through to obtain sheath material; Modifier A comprises the following raw materials, by weight: 2-3 parts 5-cosylresorcinol, 1-2 parts 4,5-difluorophthalic acid, 5-10 parts hydroxyl-terminated methyl vinyl silicone oil, and 0.02-0.03 parts sulfuric acid; the sheath material comprises the following raw materials, by weight: 30 parts methyl vinyl silicone rubber, 60-70 parts ethylene propylene diene monomer (EPDM) rubber, 3-8 parts silica, 20-30 parts modified zinc oxide, 1-2 parts stearic acid, 2-5 parts antioxidant, 1-2 parts sulfur, 1-2 parts di-tert-butyl peroxide isopropylbenzene, and 8-15 parts modifier A; The preparation of the antifreeze adhesive coating includes the following steps: S1: Take 5-neoceneresorcinol, hydroxyl-terminated methyl vinyl silicone oil, and sulfuric acid, heat and stir to react, and obtain modifier B; S2: Take hydrophobic fumed silica and xylene, stir, add EPDM rubber, stir, add modifier B and modifier A, stir, and obtain antifreeze adhesive coating. Modifier B comprises the following raw materials, by weight: 1-2 parts 5-co-eicosylresorcinol, 30-50 parts hydroxyl-terminated methyl vinyl silicone oil, and 0.03-0.05 parts sulfuric acid; the antifreeze coating comprises the following raw materials, by weight: 1-2 parts hydrophobic fumed silica, 50-100 parts xylene, 10-15 parts ethylene propylene diene monomer (EPDM) rubber, 15-20 parts modifier B, and 1-2 parts modifier A.

2. The manufacturing process of a high-strength, low-temperature resistant three-core flexible cable according to claim 1, characterized in that: The preparation of the modified zinc oxide includes the following steps: Take zinc oxide, water, ethanol, and silane coupling agent, stir, filter to obtain the solid, and dry to obtain modified zinc oxide; The modified zinc oxide comprises the following raw materials, by mass parts: 10 parts zinc oxide, 50-60 parts water, 50-60 parts ethanol, and 2-3 parts silane coupling agent; the silane coupling agent is obtained by combining sulfur-containing silane coupling agent and vinyl silane coupling agent in a mass ratio of (1-3):

1.

3. The manufacturing process of a high-strength, low-temperature resistant three-core flexible cable according to claim 1, characterized in that: The initiator solution is a methanol solution of azobisisobutyronitrile, with the amount of azobisisobutyronitrile added being 15wt%; the spraying amount of the initiator solution is 10-15g / m2; the thickness of the antifreeze coating layer is 0.2-0.5mm; and the thickness of the sheath layer is 1-2mm.

4. The manufacturing process of a high-strength, low-temperature resistant three-core flexible cable according to claim 1, characterized in that: In step S3, the heating curing conditions are: heating and curing at 65-70℃ for 1-2 hours.

5. The manufacturing process of a high-strength, low-temperature resistant three-core flexible cable according to claim 1, characterized in that: The extrusion process for the sheath material is as follows: temperature 300-350℃, pressure 0.5-0.8MPa.

6. The manufacturing process of a high-strength, low-temperature resistant three-core flexible cable according to claim 1, characterized in that: The insulating layer material comprises the following raw materials, by weight: 15-20 parts butyl rubber, 15-20 parts ethylene propylene diene monomer (EPDM) rubber, 3-5 parts calcium carbonate, 3-5 parts silicon dioxide, 20-30 parts polyvinyl chloride, 5-10 parts plasticizer, 10-15 parts iron oxide, and 2-3 parts paraffin oil.

7. A high-strength, low-temperature resistant three-core flexible cable prepared according to any one of claims 1 to 6.

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