Low smoke zero halogen flame retardant sheath layer for optical cable

Abstract

The invention discloses a low smoke zero halogen flame retardant sheath layer for an optical cable, wherein the optical cable comprises an optical cable core and a low smoke zero halogen flame retardant sheath layer covering the outer surface of the optical cable, and the low smoke zero halogen flame retardant sheath layer is composed of the following components in parts by weight: 65-75 parts of ethylene-vinyl acetate copolymer, 20-30 parts of high-pressure metallocene polyethylene, 10-20 parts of special modified polyethylene, 70-110 parts of aluminium hydroxide, 20-30 parts of magnesium hydroxide, 2-5 parts of silicone master batch, 1-3 parts of polyethylene wax, 30-50 parts of flowable agent, 0.15-0.45 parts of antioxidant and 2-5 parts of black master batch. The low smoke zero halogen flame retardant sheath layer for the optical cable enables the outer diameter of the optical cable to be even, thereby guaranteeing the shrinkage integrity of the optical cable core; as a result, signals can not be greatly attenuated in the transmission process in the cable; and simultaneously, the tensile strength of the cable is greater than or equal to 13 MPa, while the elongation at break is greater than or equal to 250% and the oxygen index is greater than or equal to 34%; and the cable has excellent mechanical properties.

Description

technical field [0001] The invention relates to a flame-retardant sheath layer, in particular to a low-smoke halogen-free flame-retardant sheath layer for optical cables. Background technique [0002] With the enhancement of people's awareness of environmental protection and safety, the requirements for cable sheathing materials are getting higher and higher. Not only must they have excellent physical and mechanical properties, but they must also have high flame retardancy. According to relevant literature statistics, In the fire, the vast majority of people did not burn to death, but lost the chance of escape due to suffocation caused by a large amount of smoke and toxic gas, and finally lost their lives. Therefore, low-smoke halogen-free flame-retardant polyolefin cable compound is gradually replacing traditional PVC cable sheath compound as an environmentally friendly product. Since the "first year of China's FTTH" in 2008, China Telecom and other domestic operators have...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a low-smoke, halogen-free, flame-retardant sheath layer for optical cables, which solves the technical problem of adhesion to the core unit of the optical cable during cable forming, improves the processing performance of the product, and makes the outer surface of the optical cable The diameter is uniform, thus ensuring the shrinkage integrity of the optical cable core, and the signal will not be greatly attenuated during transmission; at the same time, the cable tensile strength is ≥13MPa, the elongation at break is ≥250%, and the oxygen index is ≥34%. excellent mechanical properties

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