A high-speed, low-shrinkage, low-smoke, halogen-free tight casing for 4g optical cable and its preparation method

Abstract

The invention discloses a high-speed low-shrink low-smoke zero-halogen tight-buffered material used for a 4G optical cable and a preparation method of the high-speed low-shrink low-smoke zero-halogen tight-buffered material. The tight-buffered material is composed of the following raw materials in parts by weight: 30-60 parts of ethylene-vinyl acetate copolymer, 10-20 parts of linear low density polyethylene, 20-30 parts of high density polyethylene, 10-30 parts of compatilizer, 100-150 parts of filler-type flame retardant, 25-60 parts of synergistic flame retardant, 1-2 parts of silane coupling agent, 2-5 parts of ultra-high molecular weight silicone master batch, 0.5-1 part of amides high-performance lubrication dispersant and 0.2-0.5 part of compound antioxygen through stirring, mixing and extruding steps. The tight-buffered material prepared by elaborate formula selection and processing is low in shrinking percentage, strong in rigidity, high in hardness, high in extrusion molding speed, low in rejection rate and good in high / low temperature cycling resistance. When the tight-buffered material is processed, die orifice stacking and salivation are less, the surface of the optical cable is smooth, fine and particle-free, and the tight-buffered material is easy to peel.

Description

technical field [0001] The invention belongs to the field of polymer material processing, and relates to a plastic particle and a preparation method thereof, in particular to a high-speed, low-shrinkage, low-smoke, halogen-free tight sleeve material for 4G optical cables and a preparation method thereof. Background technique [0002] In 1966, Kao first proposed the idea that optical fiber could be used for communication transmission. With the advancement of technology, optical fiber has gradually become practical, and because the transmission loss of light in optical fiber is much lower than that of electricity in electric wire, optical fiber is used as a long-term The transmission of distance information is more beneficial. At present, optical fiber and optical cable have become the best carriers for data transmission. There are generally two designs of optical cables, one is ointment-filled loose-pack type, and the other is tight-buffered optical fiber type. Tight-buffere...

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Problems solved by technology

For example, patent CN103289181A discloses a thermoplastic low-smoke, halogen-free, flame-retardant polyolefin tight casing for optical cables and its preparation method. The low-smoke, halogen-free, and flame-retardant polyolefin tight casing is made of ethylene vinyl acetate resin, linear low-density polyethylene resin, Polyethylene resin, halogen-free flame retardant, flame retardant synergist, compound coupling agent, antioxidant, compound wax system and compound external lubrication system and other raw materials are made by stirring, kneading, extrusion and other steps. This invention changed the previous formula, carefully selected the new formula and processing method, increased the extrusion speed to a certain extent, reduced the shrinkage rate and waste rate, but the matrix resin in this patent is relatively soft, melting point or softening temperature Low, can not guarantee the rigidity of the material, and the terpene resin is extracted from rosin, can not guarantee the uniformity of its microstructure, in the process of high-speed processing, it will cause large fluctuations in the wire diameter and appearance of the product

[0004] During the processing and use of the optical cable, the outer sheath or the optical fiber tight sleeve itself may shrink, and this shrinkage will destroy the optical fiber itself or the polyacrylic coating on the surface, resulting in signal attenuation

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