125 DEG C high-performance low-smoke low-halogen cable for locomotive and manufacturing process thereof

Abstract

The invention discloses a 125 DEG C high-performance locomotive low-smoke low-halogen cable and a manufacturing process thereof, the 125 DEG C high-performance locomotive low-smoke low-halogen cable comprises three copper conductors formed by twisting a plurality of copper conductors, the surface of each copper conductor is coated with a low-smoke low-halogen insulating layer, and the outer surfaces of the three copper conductors are coated with a low-smoke low-halogen sheath layer; each of the low-smoke low-halogen insulating layer and the low-smoke low-halogen sheath layer is prepared from the following components in parts by weight: 100 parts of ethylene-vinyl acetate copolymer, 40-60 parts of polyolefin elastomer, 30-50 parts of compatilizer, 1.5-2.5 parts of lubricant, 200-300 parts of inorganic flame retardant, 0.5-1 part of antioxidant, 1-2 parts of smoke suppressant, 2-4 parts of erucyl amide and 1-3 parts of didodecanol ester. According to the 125 DEG C high-performance low-smoke low-halogen cable for the locomotive, the low-temperature resistance of the cable is improved, and the cable passes a low-temperature impact embrittlement test at minus 60 DEG C and can be suitable for cold weather.

Description

Technical Field

[0001] The invention relates to a locomotive cable, in particular to a 125°C high-performance low-smoke and low-halogen cable for locomotives. Background Art

[0002] China Railway Enterprise Standard Q / CRRC J 142.1-2023 "Cables for Diesel Locomotives in Rail Transit Equipment Part 1: Cables with Standard Wall Thickness" is a new standard for cables for diesel locomotives. This standard does not make specific standard requirements for the smoke density and halogen content of cables, so low-halogen materials can be used as cable insulation materials. Low-halogen insulation materials can greatly improve the oil resistance, high and low temperature resistance, moisture resistance and high flame retardancy of cables, which are greatly improved compared to the low-smoke halogen-free cables for locomotives specified in the European standard EN 50264-2008 and the national standard GB / T 12528-2008.

[0003] However, the current standard requires a high temperature resistance level of 90°C or a false mark of 125°C, and a low temperature resistance level of -40°C, which makes it difficult to cope with the harsh conditions when locomotives are running in high temperature and cold areas. Summary of the invention

[0004] The present invention provides a 125°C high-performance low-smoke, low-halogen cable for locomotives. The 125°C high-performance low-smoke, low-halogen cable for locomotives improves the low-temperature resistance of the cable, passes the low-temperature impact embrittlement test at -60°C, and is suitable for cold climates. At the same time, a manufacturing process of the 125°C high-performance low-smoke, low-halogen cable for locomotives is provided.

[0005] To achieve the above object, the cable technical solution adopted by the present invention is: a 125℃ high-performance low-smoke and low-halogen cable for locomotives, comprising three copper conductors formed by twisting a plurality of copper wires, the surface of the copper conductors being coated with a low-smoke and low-halogen insulation layer, and a low-smoke and low-halogen sheath layer being coated on the outer surface of the three copper conductors; The low-smoke and low-halogen insulation layer and the low-smoke and low-halogen sheath layer are composed of the following components in parts by weight: 100 parts of ethylene-vinyl acetate copolymer, 40~60 parts of polyolefin elastomer, Compatibilizer 30~50 parts, 1.5~2.5 parts of lubricant, 200~300 parts of inorganic flame retardant, Antioxidant 0.5~1 part, 1~2 parts of smoke suppressant, 2-4 parts of erucamide, 1-3 parts of didodecyl alcohol ester.

[0006] The relevant contents in the above technical solution are explained as follows: 1. In the above scheme, the antioxidant is at least one of antioxidant 1010 and antioxidant 168.

[0007] 2. In the above scheme, the lubricant is at least one of barium stearate, magnesium stearate, zinc stearate and calcium stearate.

[0008] 3. In the above scheme, the compatibilizer is maleic anhydride grafted styrene copolymer.

[0009] 4. In the above scheme, the smoke suppressant is at least two of antimony trioxide, neoborax, ferrocene and molybdenum trioxide.

[0010] The manufacturing process technology scheme adopted by the present invention is: a manufacturing process for the above-mentioned 125°C high-performance locomotive low-smoke and low-halogen cable, comprising the following steps: Step 1, 100 parts of ethylene-vinyl acetate copolymer, 40-60 parts of polyolefin elastomer, 30-50 parts of compatibilizer, 1.5-2.5 parts of lubricant, 200-300 parts of inorganic flame retardant, 0.5-1 part of antioxidant, 1-2 parts of smoke suppressant, 2-4 parts of erucamide and 1-3 parts of didodecanol ester are mixed uniformly in a high-speed mixer and then put into a twin-screw extruder for extrusion granulation; Step 2: The granulated cable materials after twin-screw extrusion at a temperature controlled at 120-130° C. are respectively coated on the surface of the copper conductor and the outer surface of the shielding layer, and irradiated at a dose of 5-15 Mrad, and air-cooled and dried to obtain the cable.

[0011] The relevant contents in the above technical solution are explained as follows: 1. In the above scheme, the temperature of the twin-screw extruder is set as follows: 150±2°C in zone 1, 160±2°C in zone 2, 175±2°C in zone 3, 180±2°C in zone 4, and 190±2°C in zone 5.

[0012] 2. In the above scheme, the head and mold of the twin-screw extruder are both set to 200±2℃.

[0013] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The invention discloses a 125°C high-performance low-smoke and low-halogen cable for locomotives and a manufacturing process thereof. The low-smoke and low-halogen insulation layer and the low-smoke and low-halogen sheath layer are based on 100 parts of ethylene-vinyl acetate copolymer and 40-60 parts of polyolefin elastomer, and further added with 2-4 parts of erucamide and 1-3 parts of didodecanol ester, thereby improving the low-temperature resistance of the cable, passing the low-temperature impact embrittlement test at -60°C, and being suitable for cold climates. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1This is a schematic structural diagram of the 125°C high performance low-smoke and low-halogen cable for locomotives of the present invention.

[0015] In the above figures: 1. copper conductor; 2. low smoke and low halogen insulation layer; 3. low smoke and low halogen sheath layer; 4. copper wire. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with embodiments: Embodiments 1 to 4: A 125°C high-performance low-smoke, low-halogen cable for locomotives, comprising three copper conductors 1 formed by twisting a plurality of copper wires 4, the surface of the copper conductor 1 being coated with a low-smoke, low-halogen insulation layer 2, and a low-smoke, low-halogen sheath layer 3 being coated on the outer surface of the three copper conductors 1; The low smoke and low halogen insulation layer 2 and the low smoke and low halogen sheath layer 3 are composed of the following components in parts by weight, as shown in Table 1: Table 1 Example 1 Example 2 Example 3 Example 4 Ethylene-vinyl acetate copolymer 100 copies 100 copies 100 copies 100 copies Polyolefin elastomer 50 servings 45 servings 50 servings 55 servings Compatibilizer 40 servings 35 servings 40 servings 45 servings Lubricants 2 servings 1.8 servings 2 servings 1.8 servings Inorganic flame retardants 250 copies 280 copies 255 copies 280 copies Antioxidants 0.6 parts 1 serving 0.8 parts 0.6 parts Smoke suppressants 1.2 servings 2 servings 1.2 servings 1.5 servings Erucamide 3.5 servings 3 servings 2 servings 3 servings Didodecyl alcohol ester 1.5 servings 2 servings 1.8 servings 2 servings

[0017] The antioxidant in Example 1 is antioxidant 1010, the lubricant is magnesium stearate and zinc stearate mixed in a weight ratio of 1:2, the compatibilizer is maleic anhydride grafted styrene copolymer, and the smoke suppressant is antimony trioxide and new boric acid mixed in a weight ratio of 1:1.

[0018] The antioxidant in Example 2 is antioxidant 168, the lubricant is zinc stearate, the compatibilizer is maleic anhydride grafted styrene copolymer, and the smoke suppressant is boric acid and molybdenum trioxide mixed in a weight ratio of 2:1.

[0019] The antioxidant in Example 3 is antioxidant 168, the lubricant is zinc stearate, the compatibilizer is maleic anhydride grafted styrene copolymer, and the smoke suppressant is boric acid and ferrocene mixed in a weight ratio of 1:1.

[0020] The antioxidant in Example 4 is antioxidant 1010, the lubricant is calcium stearate, the compatibilizer is maleic anhydride grafted styrene copolymer, and the smoke suppressant is ferrocene and molybdenum trioxide mixed in a weight ratio of 1:3.

[0021] A manufacturing process for the above-mentioned 125°C high-performance low-smoke and low-halogen cable for locomotives comprises the following steps: Step 1, mixing ethylene-vinyl acetate copolymer, polyolefin elastomer, compatibilizer, lubricant, inorganic flame retardant, antioxidant, smoke suppressant, erucic acid amide and didodecyl alcohol ester uniformly in a high-speed mixer and then putting into a twin-screw extruder for extrusion granulation; Step 2: The granulated cable materials after twin-screw extrusion at a temperature controlled at 125° C. are respectively coated on the surface of the copper conductor 1 and the outer surface of the shielding layer 4, and irradiated with an irradiation dose of 10 Mrad, and air-cooled and dried to obtain the cable.

[0022] The temperature of the twin-screw extruder is set as follows: 150±2°C in barrel zone 1, 160±2°C in barrel zone 2, 175±2°C in barrel zone 3, 180±2°C in barrel zone 4, and 190±2°C in barrel zone 5.

[0023] The die head and die of the above twin-screw extruder were both set to 200±2°C.

[0024] Comparative Examples 1-2: A 125°C low-smoke, low-halogen cable for locomotives, comprising three copper conductors 1 formed by twisting a plurality of copper wires 4, the surface of the copper conductor 1 being coated with a low-smoke, low-halogen insulation layer 2, and a low-smoke, low-halogen sheath layer 3 being coated on the outer surface of the three copper conductors 1; The low smoke and low halogen insulation layer 2 and the low smoke and low halogen sheath layer 3 are composed of the following components in parts by weight, as shown in Table 2: Table 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Ethylene-vinyl acetate copolymer 100 copies 100 copies 100 copies Polyolefin elastomer 50 servings 50 servings 50 servings Compatibilizer 40 servings 40 servings 40 servings Lubricants 2 servings 2 servings 2 servings Inorganic flame retardants 250 copies 250 copies 250 copies Antioxidants 0.6 parts 0.6 parts 0.6 parts Smoke suppressants 1.2 servings 1.2 servings 1.2 servings Erucamide - 3.5 servings - Didodecyl alcohol ester 1.5 servings - -

[0025] The antioxidant in Comparative Example 1 is antioxidant 1010, the lubricant is magnesium stearate and zinc stearate mixed in a weight ratio of 1:2, the compatibilizer is maleic anhydride grafted styrene copolymer, and the smoke suppressant is antimony trioxide and new boric acid mixed in a weight ratio of 1:1.

[0026] The antioxidant in Comparative Example 2 is antioxidant 168, the lubricant is zinc stearate, the compatibilizer is maleic anhydride grafted styrene copolymer, and the smoke suppressant is boric acid and molybdenum trioxide mixed in a weight ratio of 2:1.

[0027] The preparation process steps of the comparative example are the same as those of the example.

[0028] The 125°C locomotive low-smoke and low-halogen cables obtained in Examples 1-2 and Comparative Examples 1-3 were subjected to a low-temperature impact embrittlement test according to the method of GB / T 2951.14-2008. The corresponding properties are shown in Table 3: Table 3 -20℃ -40℃ -65℃ Example 1 pass 1.672 pass Example 2 pass 1.714 pass Comparative Example 1 pass Failed Failed Comparative Example 2 pass pass Failed Comparative Example 3 pass Failed Failed ; As shown in the evaluation results of Table 3, Examples 1 and 2 passed the low-temperature impact embrittlement test at -20°C, -40°C and -65°C; Comparative Example 1 passed the low-temperature impact embrittlement test at 20°C, but failed the low-temperature impact embrittlement test at -40°C and -65°C; Comparative Example 2 passed the low-temperature impact embrittlement test at -20°C and -40°C, but failed the low-temperature impact embrittlement test at -65°C; Comparative Example 3 passed the low-temperature impact embrittlement test at -20°C, but failed the low-temperature impact embrittlement test at -40°C and -65°C.

[0029] When the above-mentioned 125℃ high-performance low-smoke and low-halogen cable for locomotives is used, the low-temperature resistance of the cable is improved, and it has passed the low-temperature impact embrittlement test at minus 60℃, and can be used in cold climates.

[0030] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A 125℃ high performance low smoke and low halogen cable for locomotives, characterized by: It comprises three copper conductors (1) formed by twisting a plurality of copper wires (4), the surface of the copper conductor (1) is coated with a low-smoke, low-halogen insulation layer (2), and a low-smoke, low-halogen sheath layer (3) is coated on the outer surface of the three copper conductors (1); The low-smoke, low-halogen insulation layer (2) and the low-smoke, low-halogen sheath layer (3) are both composed of the following components in parts by weight: 100 parts of ethylene-vinyl acetate copolymer, 40~60 parts of polyolefin elastomer, Compatibilizer 30~50 parts, 1.5~2.5 parts of lubricant, 200~300 parts of inorganic flame retardant, Antioxidant 0.5~1 part, 1~2 parts of smoke suppressant, 2-4 parts of erucamide, 1-3 parts of didodecyl alcohol ester.

2. The 125°C high performance low smoke and low halogen cable for locomotives according to claim 1, characterized in that: The antioxidant is at least one of antioxidant 1010 and antioxidant 168.

3. The 125°C high performance low smoke and low halogen cable for locomotives according to claim 1, characterized in that: The lubricant is at least one of barium stearate, magnesium stearate, zinc stearate and calcium stearate.

4. The 125°C high performance low smoke and low halogen cable for locomotives according to claim 1, characterized in that: The compatibilizer is maleic anhydride grafted styrene copolymer.

5. The 125°C high performance low smoke and low halogen cable for locomotives according to claim 1, characterized in that: The smoke suppressant is at least two of antimony trioxide, neoborax, ferrocene and molybdenum trioxide.

6. A manufacturing process for the 125°C high performance low smoke and low halogen cable for locomotives as claimed in claim 1, characterized in that: The following steps are involved: Step 1, 100 parts of ethylene-vinyl acetate copolymer, 40-60 parts of polyolefin elastomer, 30-50 parts of compatibilizer, 1.5-2.5 parts of lubricant, 200-300 parts of inorganic flame retardant, 0.5-1 part of antioxidant, 1-2 parts of smoke suppressant, 2-4 parts of erucamide and 1-3 parts of didodecanol ester are mixed uniformly in a high-speed mixer and then put into a twin-screw extruder for extrusion granulation; Step 2: The granulated cable materials are extruded by a twin-screw extruder at a temperature controlled at 120-130° C. and coated on the surface of the copper conductor (1) and the outer surface of the shielding layer (4) respectively, and irradiated at a dose of 5-15 Mrad, and then air-cooled and dried to obtain the cable.

7. The manufacturing process of the 125°C high performance low smoke and low halogen cable for locomotives according to claim 6 is characterized by: The temperature of the twin-screw extruder is set as follows: 150±2°C in barrel zone 1, 160±2°C in barrel zone 2, 175±2°C in barrel zone 3, 180±2°C in barrel zone 4, and 190±2°C in barrel zone 5.

8. The manufacturing process of the 125°C high performance low smoke and low halogen cable for locomotives according to claim 6 is characterized by: The head and die of the twin-screw extruder were both set at 200±2°C.

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