Preparation process of environmentally friendly flame-retardant PVC cable sheath material for flexible optical cable

Abstract

The invention discloses a preparation process of an environmentally friendly flame-retardant PVC cable sheath material for flexible optical cables, comprising the following steps: adding SG3 type PVC resin to a high-speed mixer, and adding an environmentally friendly calcium-zinc composite stabilizer when the temperature of the material rises to 75°C , acrylate copolymer, flame retardant, calcium carbonate, lubricant, antioxidant, continue to stir until the temperature is 105°C, the components in the sheath material and the content by weight are PVC resin 100, plasticizer Agent 25-45, environmental calcium zinc composite stabilizer 5-10, acrylate copolymer 2-8, flame retardant 4-8, calcium carbonate 10-30, lubricant 0.3-1, antioxidant 0.1-0.5; The released material then enters the twin-screw extruder for extrusion and mixing, and then enters the single-screw extruder for granulation. Using the mold surface eager cutting granulation process, the produced particles enter the first-stage cyclone cooling and separation through the fan conveying pipeline. Finished materials are obtained from the separator, the second-stage cyclone cooling separator, the air-cooled vibrating screen, and the third-stage cyclone cooling separator. The preparation process of the invention has small shrinkage rate, high surface hardness and good flame retardancy.

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.