Special anti-bonding low-smoke halogen-free flame-retardant sheath material for GJFJZY type multi-core indoor optical cable

Abstract

The invention discloses a special anti-bonding low-smoke halogen-free flame-retardant sheath material for a GJFJZY type multi-core indoor optical cable. The sheath material comprises the following components in parts by weight: 5-15 parts of ethylene-vinyl acetate copolymer (EVA), 10-20 parts of polyethylene (PE), 5-10 parts of polypropylene (PP), 55-65 parts of flame retardant, 5-10 parts of compatilizer, 2-3 parts of ultra-high molecular weight silicone, 0.5-1.5 parts of high-melting-point polyethylene wax and 0.3-0.8 part of antioxidant. The PE and the PP having high melting points are used as base materials; a small amount of EVA is further used; the flame retardant is added to achieve the flame-retardant effect; meanwhile, the ultra-high molecular weight silicone is used as internal and external lubricant to improve the material flowability and the powder dispersion effect, the use amount is increased, and the ultra-high molecular weight ensures that no precipitation exists in resin; the high-melting-point polyethylene wax is further used as external lubricant, and the high melting point ensures that sufficient lubrication action exists at high temperature and no precipitation exists on the surface early at low temperature so as to further avoid inactivation, thus realizing that a thin wax layer is formed between a core wire and a sheath layer in the extruding process at about 160 DEG C and serves as an isolating layer; and the core wire and the sheath layer disclosed by the invention have great difference in material, thereby finally ensuring that the both can not be bonded together. Thus, the normal use of a GJFJZY type multi-core optical cable is ensured.

Description

technical field [0001] The invention relates to a special sheath material for a GJFJZY type multi-core indoor optical cable. Background technique [0002] The core wire of the current GJFJZY multi-core indoor optical cable is low-smoke and halogen-free material, and the sheath layer also uses the same low-smoke and halogen-free material. The core wire has no cabling process, and there is no protective layer between the core wire and the sheath. In this way, during the extrusion process at about 160°C, the core wire is easily bonded to the sheath layer, so that the core wire or the sheath layer is separated during cooling shrinkage or use, resulting in damage to the sheath layer or core wire, affecting Optical fiber signal attenuation or service life. The core wire is easily bonded to the sheath layer. This is mainly due to the fact that the sheath layer and the core wire material are the same or too similar. The two have good compatibility at high temperatures. The current ...

AI Technical Summary

Problems solved by technology

[0002]The core wire of the current GJFJZY multi-core indoor optical cable is made of low-smoke and halogen-free material, and the sheath layer also uses the same low-smoke and halogen-free material. There is no cabling process, and there is no protective layer between the core wire and the sheath,