Halogen-free low-smoke flame-retardant anti-seismic anticorrosive cable for railway vehicle

Abstract

The application discloses a kind of halogen-free low smoke flame-retardant anti-seismic anticorrosive oil-resistant railway vehicle cable, low smoke halogen-free flame-retardant polyolefin insulation layer and copper band spiral winding layer are successively coated outside conductor, two conductors are twisted with fine steel wire, and multiple layers of polyester tape winding layer is coated, three conductor cores are placed in central symmetry, elastic strip is placed between every two adjacent conductor cores to form cable core, low smoke halogen-free flame-retardant flexible glass cloth tape winding layer, polyurethane elastic sleeve, tinned soft copper wire braided shielding layer and low smoke halogen-free flame-retardant polyolefin sheath are successively coated outside cable core, and flame-retardant smoke-suppressing particles are filled between low smoke halogen-free flame-retardant flexible glass cloth tape winding layer and polyurethane elastic sleeve.The application is provided with low smoke halogen-free flame-retardant polyolefin insulation layer outside conductor, which can directly play the effect of conductor flame-retardant;Two conductors are twisted together with fine steel wire, the tensile property of conductor core is increased, and the service life of cable is increased.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and in particular to a halogen-free, low-smoke, flame-retardant, shock-resistant, corrosion-resistant, and oil-resistant cable for railway vehicles. Background Technology

[0002] In existing technologies, cables are indispensable for railway locomotives and rolling stock. With the increase in population, the number of railway lines and train services is also constantly increasing. Therefore, the requirements for the power systems on railway locomotives and rolling stock are becoming increasingly stringent. Cables are an essential element of the power system, and countless cables are required on railway locomotives and rolling stock. If a cable breaks due to aging or other reasons, emergency power cannot be supplied in time, which can paralyze the entire railway locomotive and rolling stock, making it impossible to operate normally. In addition, if the cable catches fire, it will release a large amount of dense smoke and halogenated acid gases. At this time, rescuers need to wear gas masks to extinguish the fire, which makes the rescue troublesome, time-consuming and laborious. At the same time, the large amount of dense smoke and halogenated acid gases released when the cable burns also threatens the lives of people on the railway locomotives and rolling stock. Summary of the Invention

[0003] Based on the technical problems existing in the background technology, the present invention proposes a halogen-free, low-smoke, flame-retardant, shock-resistant, corrosion-resistant, and oil-resistant cable for railway vehicles.

[0004] The technical solution adopted in this invention is:

[0005] A halogen-free, low-smoke, flame-retardant, shock-resistant, corrosion-resistant, and oil-resistant railway vehicle cable includes a conductor core. The conductor core includes a conductor, and a low-smoke, halogen-free, flame-retardant polyolefin insulation layer and a copper tape spiral wrapping layer are sequentially wrapped around the outside of the conductor. Two conductors are twisted together with fine steel wire and then wrapped with multiple layers of polyester tape to form the conductor core. Three conductor cores are placed symmetrically in a central position. An elastic strip is placed between every two adjacent conductor cores to form the cable core. The cable core is sequentially wrapped with a low-smoke, halogen-free, flame-retardant flexible glass cloth tape wrapping layer, a polyurethane elastic sleeve, a tinned soft copper wire braided shielding layer, and a low-smoke, halogen-free, flame-retardant polyolefin sheath. Flame-retardant and smoke-suppressing particles are filled between the low-smoke, halogen-free, flame-retardant flexible glass cloth tape wrapping layer and the polyurethane elastic sleeve.

[0006] The elastic strip is made of halogen-free flame-retardant TPE material.

[0007] The flame-retardant and smoke-suppressing particles are polyetheretherketone (PEEK) flame-retardant and smoke-suppressing particles.

[0008] The modified polyetheretherketone flame retardant and smoke-suppressing particles are composed of the following raw materials in parts by weight:

[0009] Polyetheretherketone 110-130, vinyltriethoxysilane 3-4, trifluoroethyl methacrylate 10-12, dicumyl peroxide 2-4, expanded perlite 10-20, carboxymethyl cellulose 10-13, polyisocyanate 3-6.

[0010] The preparation method of the modified polyetheretherketone flame retardant and smoke-suppressing particles includes the following steps:

[0011] (1) Take dicumyl peroxide and add it to anhydrous ethanol at 20-30 times its weight, stir well to obtain an initiator solution;

[0012] (2) Mix expanded perlite and vinyltriethoxysilane, add to 30-40 times the weight of the mixture in deionized water, and sonicate for 1-2 hours to obtain an aqueous dispersion;

[0013] (3) Take trifluoroethyl methacrylate and polyisocyanate, mix them, add them to anhydrous ethanol at 6-10 times the weight of the mixture, stir evenly, add them to the above aqueous dispersion, stir evenly, send them to the reactor, introduce nitrogen gas, adjust the reactor temperature to 110-120℃, add the above initiator solution, keep warm and stir for 3-5 hours, discharge the material, add carboxymethyl cellulose, stir evenly, filter, wash the filter cake with water, vacuum dry, mix it with polyether ether ketone, stir evenly, send it to the extruder, melt extrude, cool, granulate, and obtain the product.

[0014] The advantages of this invention are: The invention features a low-smoke, halogen-free, flame-retardant polyolefin insulation layer on the outside of the conductor, directly achieving a flame-retardant effect on the conductor; the two conductors are twisted together with fine steel wire, increasing the tensile strength of the conductor core, making it less prone to breakage and extending the cable's service life; the polyurethane elastic sheath enhances the cable's heat insulation, sound insulation, shock resistance, and pressure resistance; the polyetheretherketone (PEEK) flame-retardant and smoke-suppressing particles further improve the cable's flame retardancy and fire resistance, making it less likely to produce toxic and harmful halogen gases. The modified PEEK flame-retardant and smoke-suppressing particles added in this invention use expanded perlite as a flame-retardant additive, blended with acrylate. Through polymerization, the polyacrylate is dispersed into the interlayer of the perlite, forming a stable carbon layer upon combustion, resulting in excellent smoke suppression and fire prevention effects. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Example 1

[0017] A halogen-free, low-smoke, flame-retardant, shock-resistant, corrosion-resistant, and oil-resistant railway vehicle cable includes a conductor core. The conductor core includes a conductor 1. The conductor 1 is sequentially covered with a low-smoke, halogen-free, flame-retardant polyolefin insulation layer 2 and a copper tape spiral wrapping layer 3. Two conductors 1 are twisted together with a thin steel wire 4 and then covered with a multi-layer polyester tape wrapping layer 5 to form a conductor core. The three conductor cores are placed symmetrically at the center. An elastic strip 6 is placed between every two adjacent conductor cores to form a cable core. The cable core is sequentially covered with a low-smoke, halogen-free, flame-retardant flexible glass cloth tape wrapping layer 7, a polyurethane elastic sleeve 8, a tinned soft copper wire braided shielding layer 9, and a low-smoke, halogen-free, flame-retardant polyolefin sheath 10. Flame-retardant and smoke-suppressing particles 11 are filled between the low-smoke, halogen-free, flame-retardant flexible glass cloth tape wrapping layer 7 and the polyurethane elastic sleeve 8.

[0018] The elastic strip 6 is made of halogen-free flame-retardant TPE material. The elastic sleeve is placed between adjacent conductors to increase the cable's resistance to torsion.

[0019] Flame-retardant and smoke-suppressing particles 11 are polyetheretherketone (PEEK) flame-retardant and smoke-suppressing particles.

[0020] Modified polyetheretherketone (PEEK) flame retardant and smoke-suppressing granules are composed of the following raw materials in parts by weight:

[0021] Polyetheretherketone 110, vinyltriethoxysilane 3, trifluoroethyl methacrylate 10, dicumyl peroxide 2, expanded perlite 10, carboxymethyl cellulose 10, polyisocyanate 3.

[0022] A method for preparing modified polyetheretherketone (PEEK) flame-retardant and smoke-suppressing particles includes the following steps:

[0023] (1) Take dicumyl peroxide and add it to anhydrous ethanol at 20 times its weight, stir well to obtain an initiator solution;

[0024] (2) Take expanded perlite and vinyltriethoxysilane, mix them, add them to 30 times the weight of the mixture in deionized water, and sonicate for 1 hour to obtain an aqueous dispersion;

[0025] (3) Take trifluoroethyl methacrylate and polyisocyanate, mix them, add them to anhydrous ethanol at 6 times the weight of the mixture, stir evenly, add them to the above aqueous dispersion, stir evenly, send them to the reactor, introduce nitrogen gas, adjust the reactor temperature to 110℃, add the above initiator solution, keep warm and stir for 3 hours, discharge the material, add carboxymethyl cellulose, stir evenly, filter, wash the filter cake with water, vacuum dry it, mix it with polyether ether ketone, stir evenly, send it to the extruder, melt extrude, cool, granulate, and obtain the product. Example 2

[0026] A halogen-free, low-smoke, flame-retardant, shock-resistant, corrosion-resistant, and oil-resistant railway vehicle cable includes a conductor core. The conductor core includes a conductor 1. The conductor 1 is sequentially covered with a low-smoke, halogen-free, flame-retardant polyolefin insulation layer 2 and a copper tape spiral wrapping layer 3. Two conductors 1 are twisted together with a thin steel wire 4 and then covered with a multi-layer polyester tape wrapping layer 5 to form a conductor core. The three conductor cores are placed symmetrically at the center. An elastic strip 6 is placed between every two adjacent conductor cores to form a cable core. The cable core is sequentially covered with a low-smoke, halogen-free, flame-retardant flexible glass cloth tape wrapping layer 7, a polyurethane elastic sleeve 8, a tinned soft copper wire braided shielding layer 9, and a low-smoke, halogen-free, flame-retardant polyolefin sheath 10. Flame-retardant and smoke-suppressing particles 11 are filled between the low-smoke, halogen-free, flame-retardant flexible glass cloth tape wrapping layer 7 and the polyurethane elastic sleeve 8.

[0027] The elastic strip 6 is made of halogen-free flame-retardant TPE material. The elastic sleeve is placed between adjacent conductors to increase the cable's resistance to torsion.

[0028] Flame-retardant and smoke-suppressing particles 11 are polyetheretherketone (PEEK) flame-retardant and smoke-suppressing particles.

[0029] Modified polyetheretherketone (PEEK) flame retardant and smoke-suppressing granules are composed of the following raw materials in parts by weight:

[0030] Polyetheretherketone 130, Vinyltriethoxysilane 4, Trifluoroethyl methacrylate 12, Diisopropylbenzene peroxide 4, Expanded perlite 20, Carboxymethyl cellulose 13, Polyisocyanate 6.

[0031] A method for preparing modified polyetheretherketone (PEEK) flame-retardant and smoke-suppressing particles includes the following steps:

[0032] (1) Take dicumyl peroxide and add it to anhydrous ethanol at 30 times its weight, stir well to obtain an initiator solution;

[0033] (2) Take expanded perlite and vinyltriethoxysilane, mix them, add them to 40 times the weight of the mixture in deionized water, and sonicate for 2 hours to obtain an aqueous dispersion;

[0034] (3) Take trifluoroethyl methacrylate and polyisocyanate, mix them, add them to anhydrous ethanol at 10 times the weight of the mixture, stir evenly, add them to the above aqueous dispersion, stir evenly, send them to the reactor, introduce nitrogen gas, adjust the reactor temperature to 120℃, add the above initiator solution, keep warm and stir for 5 hours, discharge the material, add carboxymethyl cellulose, stir evenly, filter, wash the filter cake with water, vacuum dry, mix it with polyether ether ketone, stir evenly, send it to the extruder, melt extrude, cool, granulate, and obtain the product.

[0035] This invention features a low-smoke, halogen-free, flame-retardant polyolefin insulation layer 2 on the outside of conductor 1, which directly provides flame retardancy to the conductor. Twisting the two conductors 1 together with fine steel wire 4 increases the tensile strength of the conductor core, making it less prone to breakage and extending the cable's service life.

[0036] Polyurethane elastic sleeve 8 has a thermoplastic linear structure, which has better stability, chemical resistance, resilience and mechanical properties than PVC foam material, and has less compression deformation; it has good heat insulation, sound insulation, shock resistance and anti-toxic properties; it is lightweight, has excellent sound insulation and heat insulation properties, chemical resistance, good electrical properties, is easy to process, has low water absorption, oil resistance, wear resistance, low temperature resistance, aging resistance, high hardness and good elasticity.

[0037] Polyetheretherketone (PEEK) flame retardant and smoke suppressant particles have a good flame retardant and smoke suppressant effect, making the cable more flame retardant and fire resistant, and making it less likely to produce toxic and harmful halogen gases.

[0038] Polypropylene filler layers are used to fill the gaps inside the cable, increasing the roundness and stability of the internal structure of the cable.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A halogen-free, low-smoke, flame-retardant, shock-resistant, corrosion-resistant, and oil-resistant cable for railway vehicles, characterized in that: The cable core includes a conductor, which is covered with a low-smoke halogen-free flame-retardant polyolefin insulation layer and a copper tape spiral wrapping layer. Two conductors are twisted together with a thin steel wire and then covered with multiple layers of polyester tape to form the conductor core. The three conductor cores are placed symmetrically in a central position, and an elastic strip is placed between every two adjacent conductor cores to form the cable core. The cable core is covered with a low-smoke halogen-free flame-retardant flexible glass cloth tape wrapping layer, a polyurethane elastic sleeve, a tinned soft copper wire braided shielding layer, and a low-smoke halogen-free flame-retardant polyolefin sheath. Flame-retardant and smoke-suppressing particles are filled between the low-smoke halogen-free flame-retardant flexible glass cloth tape wrapping layer and the polyurethane elastic sleeve. The flame-retardant and smoke-suppressing particles are modified polyetheretherketone (PEEK) flame-retardant and smoke-suppressing particles. The modified polyetheretherketone flame retardant and smoke-suppressing granules are composed of the following raw materials in parts by weight: Polyetheretherketone 110-130, vinyltriethoxysilane 3-4, trifluoroethyl methacrylate 10-12, dicumyl peroxide 2-4, expanded perlite 10-20, carboxymethyl cellulose 10-13, polyisocyanate 3-6; The preparation method of the modified polyetheretherketone flame retardant and smoke-suppressing particles includes the following steps: (1) Take dicumyl peroxide and add it to anhydrous ethanol at 20-30 times its weight, stir well to obtain an initiator solution; (2) Mix expanded perlite and vinyltriethoxysilane, add to 30-40 times the weight of the mixture in deionized water, and sonicate for 1-2 hours to obtain an aqueous dispersion; (3) Take trifluoroethyl methacrylate and polyisocyanate, mix them, add them to anhydrous ethanol at 6-10 times the weight of the mixture, stir evenly, add them to the above aqueous dispersion, stir evenly, send them to the reactor, introduce nitrogen gas, adjust the reactor temperature to 110-120℃, add the above initiator solution, keep warm and stir for 3-5 hours, discharge the material, add carboxymethyl cellulose, stir evenly, filter, wash the filter cake with water, vacuum dry, mix it with polyether ether ketone, stir evenly, send it to the extruder, melt extrude, cool, granulate, and obtain the product.

2. A halogen-free, low smoke, flame-retardant, anti-vibration, anti-corrosion, and oil-resistant cable for railway vehicle according to claim 1, characterized in that: The elastic strip is made of halogen-free flame-retardant TPE material.

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