Oil-resistant irradiation-crosslinking low-smoke halogen-free flame-retardant polyolefin material for locomotive wires and cables

Abstract

The invention relates to an oil-resistant irradiation-crosslinking low-smoke halogen-free flame-retardant polyolefin material for locomotive wires and cables, belonging to the technical field of high-polymer materials for wires and cables. The oil-resistant irradiation-crosslinking low-smoke halogen-free flame-retardant polyolefin material for locomotive wires and cables is prepared from the following raw materials in parts by weight: 50-80 parts of ethylene-vinyl acetate copolymer, 15-30 parts of high-polymer compatilizer, 5-25 parts of metallocene linear low density polyethylene, 120-150 parts of inorganic flame retardant, no more than 10 parts of flame-retardant synergist, 5-25 parts of electric property modifier, 2-5 parts of crosslinking assistant, 2-3 parts of antioxidant, no more than 1 part of copper inhibitor and 2-3 parts of lubricant. The polyolefin material has the advantages of low smoke, no halogen, environment friendliness, favorable oil corrosion resistance and favorable thermal aging resistance, is beneficial to ensuring excellent mechanical properties, electric properties and light transmittance, is beneficial to embodying ideal extrudability, and can enable the prepared wire and cable to satisfy the single vertical burning test or bunched cable burning test according to the standard requirements.

Description

technical field [0001] The invention belongs to the technical field of polymer materials for wires and cables, and in particular relates to an oil-resistant radiation cross-linked low-smoke, halogen-free, flame-retardant polyolefin material for locomotive cables. Background technique [0002] With the continuous development of rail transit, cables suitable for electrical devices such as power distribution systems, control systems, and signal systems of rail transit vehicles with an AC rated voltage of 3KV and below have also been developed and widely used. Since locomotive cables are mainly used in places where people are relatively concentrated, such as subway vehicles and rolling stock, and are affected by the use environment, the cables used in these occasions are required to have oil resistance, heat resistance, cold resistance and good electrical properties; In order for personnel to escape in case of fire and ensure the smooth development of rescue work, cable material...

AI Technical Summary

Problems solved by technology

Since polyethylene (PE) is a non-polar material, it is generally not used in oil-resistant system formulations. The comonomer units of ordinary linear low-density polyethylene (LLDPE) are unevenly distributed between molecular bonds and tend to Block distribution, easy to cause phase separation due to thermodynamic reasons, poor oil resistance after adding

[0007] It can be seen from the above description that it is of positive significance to explore polyolefin cable materials with excellent oil resistance, ideal heat aging resistance, good mechanical and electrical properties, good flame retardancy and improved processing performance so as to fully meet the requirements of the GB / T12528 standard. However, there is no corresponding revelation in the Chinese and foreign patents and non-patent literature disclosed so far.

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