Polyolefine sheathing compound for coaxial cable and preparation method thereof

Abstract

The invention discloses a polyolefine sheathing compound for a coaxial cable and a preparation method thereof. The sheathing compound consists of the following components in parts by weight: 60-90 parts of ethylene-propylene-diene rubber, 5-25 parts of high-density polyethylene, 5-15 parts of functional polyolefin resin, 180-200 parts of flame retardant, 1-3 parts of surface modifier, 0.01-0.05 part of crosslinking agent, 0.5-2 parts of antioxidant and 1.5-9 parts of processing aid. The preparation method comprises the following steps of: putting the flame retardant into a high-speed stirrer for stirring at a high speed at the temperature of not lower than 80 DEG C; adding organosilane and stirring for 3-5 minutes; putting the remaining materials into the high-speed stirrer for continually stirring for 3-5 minutes; adding into a double-screw mixing extruder set by using a feeder for pelletizing; and drying. The sheathing compound has the advantages of flame retardance, low smoke, freeness from halogen, low toxicity, freeness from harmful heavy metals such as lead, cadmium and the like, freeness from phosphorus, difficulty in burning and small smog harm in case of fire, environmental friendliness, high temperature resistance level of 105 DEG C, high extruding performance, excellent electric performance, no need of subsequent crosslinking after stranding, saving in a large amount of manpower and materials and great reduction in the manufacturing period of the cable.

Description

technical field [0001] The invention relates to a polyolefin plastic for coaxial cables, in particular to a thermoplastic 105°C low-smoke, halogen-free, flame-retardant polyolefin sheath material. The invention also provides a preparation method for a polyolefin sheath material for coaxial cables . Background technique [0002] Due to its special structural characteristics, coaxial cables have the characteristics of low radiation loss and little influence from external interference, and are widely used in the transmission of digital and analog signals. Due to its strict requirements on performance, the requirements for plastic sheaths are also high, such as high temperature resistance, long service life, excellent electrical and physical properties, cables used indoors also need to have flame retardant grades, currently It tends to meet the requirements of halogen-free and low-smoke. Although the conventional polyvinyl chloride sheath has excellent physical properties, its...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the existing thermosetting low-smoke halogen-free flame-retardant polyolefin sheath, and provide a radiation-free cross-linking, that is, a thermoplastic sheath that meets the requirements of long-term work at 105°C, long service life, Thermoplastic 105°C low-smoke, halogen-free, flame-retardant polyolefin sheath compound for coaxial cables with halogen-free, low-smoke, flame-retardant, excellent electrical and physical properties