Anti-blocking low smoke zero halogen flame-retardant cable material for optical cable

Abstract

The invention discloses an anti-blocking low smoke zero halogen flame-retardant cable material for an optical cable. The anti-blocking low smoke zero halogen flame-retardant cable material comprises 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 modified polyethylene, 70-110 parts of aluminum 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 part of antioxidant, and 2-5 parts of black master batch, wherein the content of VA in the ethylene-vinyl acetate copolymer is 20-28%, the melt index of 2.16Kg of high pressure metallocene polyethylene at 190DEG C is less than or equal to 3g / 10min, the density is less than 0.92g / cm<3>. By adopting the anti-blocking low smoke zero halogen flame-retardant cable material, the outer diameter of the optical cable is uniform, so that the shrinkage integrity of the core of the optical cable is guaranteed, the signal transmitted in the optical cable is not attenuated sharply; and in addition, the tensile strength of the cable is greater than or equal to 13MPa, the elongation at break is greater than or equal to 250%, the oxygen index is greater than or equal to 34%, and the cable has excellent mechanical property.

Description

technical field [0001] The invention relates to a flame-retardant cable material, in particular to an anti-adhesion low-smoke halogen-free flame-retardant cable material 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 dome...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an anti-adhesion low-smoke halogen-free flame-retardant cable material for optical cables, which solves the technical problem of adhesion with the core unit of the optical cable during processing, improves the processing performance of the product, and makes the outer diameter of the optical cable uniform. In this way, the shrinkage integrity of the optical cable core is guaranteed, and the signal will not be greatly attenuated during the transmission process; at the same time, the tensile strength of the cable is ≥13MPa, the elongation at break is ≥250%, and the oxygen index is ≥34%, which has excellent mechanical properties. performance

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