Preparation method of special 105 DEG C environment-friendly flame retardant PVC (polyvinyl chloride) cable sheath material for indoor flexible optical cable

Abstract

The invention discloses a preparation method of a special 105 DEG C environment-friendly flame retardant PVC (polyvinyl chloride) cable sheath material for an indoor soft optical cable. The preparation method comprises the following steps of: firstly adding PVC (polyvinyl chloride) resin in a high-speed mixer; starting stirring at low speed with the rotation speed of 400 rpm-600 rpm; adding a plasticizing agent and starting stirring at high speed with the rotation speed of 900 rpm-1100 rpm; adding an environment-friendly heat-resisting stabilizing agent, an acrylics copolymer, a fire retarding agent, calcium carbonate, a lubricating agent and an antioxygen when the material temperature rises to 75 DEG C-85 DEG C; continuing to stir till the temperature reaches 105 DEG C-115 DEG C and the material forms the dry power state; opening a dump valve for dumping materials, wherein the sheath material comprises the following components in parts by weight: 100 parts of PVC resin, 25-45 parts of the plasticizing agent, 5-10 parts of the environment-friendly flame retardant stabilizing agent, 2-8 parts of the acrylics copolymer, 4-8 parts of the fire retarding agent, 10-30 parts of calcium carbonate, 0.3-1 part of the lubricating agent, and 0.1-0.5 part of the antioxygen; guiding the dumped materials into a double-screw extruder to be subjected to extrusion milling; and guiding the milled materials into a single-screw extruder to be pelletized; and by adopting a mold face hot-cutting pelletizing process, guiding the pelletized granules into a first-stage cyclone cooling separator, a second-stage cyclone cooling separator, an air-cooling vibrating screen, a third-stage cyclone cooling separator through a fan delivery pipeline, and finally obtaining the finished material. The manufactured sheath material has excellent flame retardant property, low product shrinking percentage and excellent surface hardness.

Description

technical field [0001] The invention relates to a preparation method of a 105°C environment-friendly flame-retardant PVC cable sheath material specially used for indoor flexible 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 shrinkage rate, and insufficient surface we...

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.