Preparation technology for environment-friendly flame-retardant PVC cable sheath material for flexible optical cable

Abstract

A preparation technology for an environment-friendly flame-retardant PVC cable sheath material for a flexible optical cable comprises the following steps: adding SG3 PVC resin into a high-speed mixer, when the material temperature reaches 75 DEG C, adding an environment-friendly calcium-zinc composite stabilizing agent, an acrylate copolymer, a fire retardant, calcium carbonate, a lubricant and an anti-oxidant, continuing to stir to have the temperature of 105 DEG C, wherein the sheath material comprises the following compositions in parts by weight, 100 parts of PVC resin, 25-45 parts of a plasticizer, 5-10 parts of the environment-friendly calcium-zinc composite stabilizing agent, 2-8 parts of the acrylate copolymer, 4-8 parts of the fire retardant, 10-30 parts of calcium carbonate, 0.3-1 part of the lubricant, and 0.1-0.5 part of the anti-oxidant; enabling the discharged material to enter a double-screw extruder for extrusion mixing, then sending to a single-screw extruder for pelleting by employing a mold-surface thermal-cutting pelleting technology, sending pelleted particles to a first-stage cyclone cooling separator, a second-stage cyclone cooling separator, a wind-cooling vibrating screen and a third-stage cyclone separator through a blower-fan conveying pipeline, so as to obtain the finished product material. The material prepared from the preparation technology is small in shrinkage rate, high in surface hardness and good in flame retardation property.

Description

technical field [0001] The invention relates to a flame-retardant PVC cable sheath material, in particular to a preparation process for an environmentally friendly flame-retardant PVC cable sheath material used for soft optical cables. Background technique [0002] In the fiber optic access project, the indoor wiring close to the user is the most complicated link. The bending performance and tensile performance of conventional indoor optical cables can no longer meet the needs of fiber-to-the-home indoor wiring. As a newly developed product in the past two years, the demand for indoor optical cables has suddenly increased. There is still a lack of special materials for such optical cables in China. . The existing ordinary PVC cable sheath materials generally have a large shrinkage rate, which affects the attenuation of the optical fiber. A large amount of mineral filling achieves the flame retardant effect, but there are also problems such as poor flame retardancy, large s...

AI Technical Summary

Problems solved by technology

The existing ordinary PVC cable sheath materials generally have a large shrinkage rate, which affects the attenuation of the optical fiber. A large number of minerals are filled to achieve the flame retardant effect, but there are also problems such as poor flame retardancy, large shrinkage, and insufficient surface wear resistance.