Irradiation crosslinking halogen-free flame retardant polyolefin material for locomotive wires and preparation method of irradiation crosslinking halogen-free flame retardant polyolefin material

Abstract

The invention belongs to the field of low-smoke halogen-free flame retardant materials, and particularly relates to an irradiation crosslinking halogen-free flame retardant polyolefin material for locomotive wires and a preparation method of the irradiation crosslinking halogen-free flame retardant polyolefin material. The polyolefin material comprises the following components in parts by mass: 20-30 parts of ethylene-vinyl acetate copolymer, 10-20 parts of polyolefin elastomer, 5-10 parts of a macromolecular compatilizer, 45-65 parts of an inorganic flame retardant subjected to surface modification treatment, 5-10 parts of a flame retardant synergist, 0.8-1.5 parts of an antioxidant, 1.5-2.5 parts of silicone masterbatches, 0.3-0.6 part of a crosslinking sensitizer, 1.5-2 parts of carbon black and 1-2 parts of a processing aid. The preparation method comprises the technological steps of surface treatment of the inorganic flame retardant, proportioning, mixing, melting, extrusion for pelletization, and the like. Compared with the prior art, the polyolefin material has the characteristics of excellent flame retardation (capable of passing the D type group burning test), oil resistance (mineral oil and fuel oil resistant), high temperature resistance (the grade is 150 DEG C), ultraviolet resistance, scratch resistance, low corrosion, low toxicity, environment friendliness, excellent processing performance, extrusion speed capable of reaching 100-150 m / min, and bright surface.

Description

technical field [0001] The invention belongs to the field of low-smoke halogen-free flame-retardant materials, in particular to an irradiation cross-linked halogen-free flame-retardant polyolefin material for locomotive wires and a preparation method thereof. Background technique [0002] Low-smoke, halogen-free, and flame-retardant polyolefin materials obtained by adding a large amount of inorganic flame retardants usually lose their mechanical properties to meet the requirements of flame retardancy, low toxicity, and low smoke. For wire and cable or automobile wire, it cannot meet the requirements of high temperature resistance, oil resistance and rapid thin-wall extrusion, and the environmental stress cracking resistance is poor, the electrical performance is reduced, and the bundled combustion cannot pass through. The reduction of these comprehensive properties limits the application of low-smoke, halogen-free and flame-retardant polyolefin materials in cable materials, ...

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Problems solved by technology

[0002] Low-smoke, halogen-free, and flame-retardant polyolefin materials obtained by adding a large amount of inorganic flame retardants usually lose their mechanical properties to meet the requirements of flame retardancy, low toxicity, and low smoke. For wire and cable or automobile wire, it cannot meet the requirements of high temperature resistance, oil resistance and rapid thin-wall extrusion, and the environmental stress cracking resistance is poor, the electrical performance is reduced, and the bundled combustion cannot pass through, etc.

The reduction of these comprehensive properties limits the application of low-smoke, halogen-free and flame-retardant polyolefin materials in cable materials, especially materials such as wires and cables for rail transit rolling stock or automotive wires.

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