Halogen-free flame retardant sheath material for optical fibers

Abstract

The invention discloses a halogen-free flame retardant sheath material for optical fibers. The material is prepared from, by weight, 50-55 parts of low-density polyethylene, 13-15 parts of EVA resin, 9-12 parts of nylon 6, 14-16 parts of magnesium hydrate, 0.6-0.8 part of dispersing agent NNO, 1.3-2 parts of titanate coupling agents 102, 5-8 parts of organic silicon, 3-5 parts of organic montmorillonite, 2-4 parts of vinyl acetate, 3-4 parts of loess powder, 2-3 parts of aluminum borate, 4-5 parts of hydrogenated jojoba oil, 3-4 parts of zinc laurate and a proper amount of deionized water. The halogen-free flame retardant sheath material has the excellent flame retardant environment-friendly function, and is resistant to heat, good in heat insulation performance, high in corrosion resistance, wide in raw material source, simple in preparation technology and worthy of popularization.

Description

technical field [0001] The invention relates to the technical field of optical fiber sheath materials, in particular to a halogen-free flame-retardant sheath material for optical fibers and a preparation method thereof. Background technique [0002] With the rapid development of the data communication industry, optical fiber is being widely used as the carrier of data transmission. The laying forms of optical fiber are buried and overhead, and with the transformation of urban network lines, most of them have been transferred underground. In order to prevent underground optical fibers and optical cables from being bitten or corroded by insects, sheath materials for optical fibers and optical cables have emerged as the times require. At present, polyolefin is mainly used as the sheath material of optical fiber and optical cable, which has the characteristics of light weight, high bending strength, small friction coefficient, good sealing performance, and corrosion res...

AI Technical Summary

Problems solved by technology

[0003] Inorganic halogen-free flame retardants have strong polarity and hydrophilicity, while polyolefins are non-polar materials, the compatibility between the two is poor, and it is difficult to form a good bond and bond at the interface, especially magnesium hydroxide Magnesium hydroxide has excellent flame retardancy, smoke suppression, anti-dripping, anti-acid and other functions, and has been widely used. However, magnesium hydroxide has strong polarity, and its thermal expansion coefficient is different from that of resin. When it is processed and molded, it will expand with heat and contract with cold. The phase interface forms fine cracks, which will lead to the decline of the mechanical performance, waterproof performance and insulation performance of the material. Therefore, the surface modification of magnesium hydroxide must be carried out to make magnesium hydroxide have better comprehensive performance in polyolefin. It has good fluidity at high temperature and high strength and toughness at service temperature, and does not change the impact resistance of polyolefin profiles