Ultraviolet cross-linked black low-smoke halogen-free cable sheath material and preparation method thereof

Abstract

The invention discloses an ultraviolet crosslinking black low-smoke halogen-free cable sheath material. The cable sheath material comprises the following components in parts by weight: 100 parts of polyolefin resin; 10 to 20 parts of a compatilizer; 115 to 145 parts of a hydroxide flame retardant; 28 to 56 parts of a nano flame retardant; 4-8 parts of a silicon flame-retardant synergist; 5 to 7 parts of a photosensitizer; 2-4 parts of an assistant cross-linking agent; 0.5 to 1.5 parts of an antioxidant; 1-3 parts of a lubricant; and 0.5 to 1.0 part of pigment carbon black, wherein the nano flame retardant is a complex of montmorillonite and ferrocene or montmorillonite. According to the cable sheath material provided by the invention, the nano flame-retardant technology is applied to the material, and the nano synergistic technology and the ultraviolet crosslinking technology are combined; and the interfacial area between the polymer and the nano flame retardant particles is very large, chemical bonding between a base material and an inorganic filler exists between the interfaces, and the cable material has ideal bonding performance, can eliminate the problem of mismatching of thermal expansion coefficients of an inorganic substance and a polymer substrate, has the advantages of flame retardancy and a lower total heat release amount, can be crosslinked by ultraviolet light, andhas a smooth molten line surface and a good extrusion surface.

Description

technical field [0001] The invention relates to a black low-smoke and halogen-free cable sheath material crosslinked by ultraviolet light and a preparation method thereof. Background technique [0002] Taking digital statistics as an example, an average fire occurs every 17 seconds across the country, especially the use of synthetic polymers has greatly aggravated the fire hazard and injury caused by combustion. In fire fatal accidents, about 80% died of suffocation by toxic gas and smoke, and low-smoke and halogen-free materials came into being. The wire and cable industry has particularly prominent requirements for flame retardancy, and relevant departments have clearly stipulated that LSZH cable materials must be used in public places. At the same time, it is promoting the halogenation of internal wires, telephone cables and data cables in buildings. Although low-smoke, halogen-free, flame-retardant polyolefin has good flame-retardant properties and produces little smok...

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Problems solved by technology

[0003] Although radiation cross-linking has high production efficiency and low cost, and does not need to add additional cross-linking aids during the cross-linking process, and maintains the cleanliness of the material and the electrical properties of the material, its disadvantages are that the one-time investment is large and there are problems during operation. security issues

In particular, black pigments have very low transmittance in the ultraviolet-visible band, and there is almost no obvious "transmission window"; in addition, a large amount of fillers in low-smoke, halogen-free, flame-retardant cable materials also affects the crosslinking efficiency of the system to a certain extent

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