High-temperature-resistant bending-resistant ethylene propylene rubber insulated cable for rail transit, preparation method thereof and insulating material

Abstract

The invention discloses a high-temperature-resistant bending-resistant ethylene propylene rubber insulated cable for rail transit and a preparation method thereof. The cable comprises a conductor, anda first polyether-ether-ketone film wrapping layer and a second polyether-ether-ketone film wrapping layer are sequentially wrapped outside the conductor. A 150 DEG C low-smoke halogen-free flame-retardant modified irradiation ethylene propylene rubber insulating layer is extruded outside the first polyether-ether-ketone film wrapping layer and the second polyether-ether-ketone film wrapping layer; a Twaron aramid fiber yarn woven reinforcing layer is woven outside the second polyether-ether-ketone film wrapping layer, and then the second polyether-ether-ketone film wrapping layer is wrappedwith a polyimide film wrapping layer; an outer surface of the polyimide film wrapping layer is coated with a ZS-322 transparent high-temperature-resistant heat-insulating coating, a high-temperature-resistant heat-insulating coating layer is formed after drying, and a high-toughness heat-resistant wear-resistant polyvinylidene fluoride outer sheath is extruded outside the high-temperature-resistant heat-insulating coating layer. The cable has excellent mechanical property, electrical property, high temperature resistance and good flame retardant property.

Description

technical field [0001] The invention relates to the field of cables and cable materials, in particular to an ethylene-propylene rubber insulated cable for high-temperature and bending-resistant rail transit, a preparation method for the cable, and an insulating material. Background technique [0002] The 21st century is a period of rapid development of my country's urban rail transit (including subways, ground light rails, and elevated light rails). Compared with other means of transportation, subways have the advantages of fast driving speed, large passenger transport volume, no floor space occupation, environmental protection and no exhaust emissions, etc. It is an effective way to solve the current urban traffic congestion and air pollution caused by exhaust emissions. With the rapid development of cities, the increasingly complex functions and the sharp increase in population, it is urgent to build a fast underground rail transit network. As an important supporting produ...

AI Technical Summary

Problems solved by technology

EPDM rubber is a polymer composed of propylene, ethylene and conjugated diene. Since the carbon atoms on the main chain are in a saturated structure, and only a few unsaturated carbon atoms are on the side chains, it has many excellent processing properties. Performance and use performance, such as low density, weather resistance, heat resistance and ozone resistance, excellent mechanical properties, etc.; but EPDM rubber also has disadvantages such as oil resistance, poor adhesion, and slow vulcanization speed

[0012] However, in the above-mentioned various methods, the peroxide chemical cross-linking method to prepare EPDM cables has the disadvantages of low production efficiency and complicated process flow, and it needs to be carried out for a long time through tens of meters of high-pressure and high-temperature steam vulcanization pipelines. Time cross-linking consumes a lot of energy, and the utilization rate of energy efficiency is very low. The effective utilization rate of heat energy is only about 10%, and it has high requirements for plant design and manufacturing equipment, and the investment is relatively large, especially for manufacturing. The technical level of personnel is extremely high. Since the sulfur pipeline is closed when starting up, the appearance of the cable cannot be observed intuitively, so the product quality is difficult to control, the yield rate is low, the manufacturing waste is great, and the production of small cross-section cables is even more difficult. It is even more difficult, and the temperature resistance level can only reach 90°C, which is not conducive to the production of ethylene-propylene rubber insulated rail transit vehicle cables; the equipment investment of the high-energy radiation cross-linking method is relatively high, the operation and maintenance are more complicated and the protection conditions are harsh, and due to Its process characteristics are only suitable for making wires with smaller wire diameters and not for cables with larger wire diameters; while the silane crosslinking method involves hydrolysis reactions, the stability of the products is poor, and the pressure and temperature resistance grades are also low.

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