Preparation method of special anti-bonding low-smoke halogen-free flame-retardant sheath material for GJFJZY type multi-core indoor optical cable

Abstract

The invention discloses a preparation method of a special anti-bonding low-smoke halogen-free flame-retardant sheath material for a GJFJZY type multi-core indoor optical cable, which comprises the following steps: selecting the following components of the sheath material in parts by weight: 5-15 parts of ethylene-vinyl acetate copolymer, 10-20 parts of polyethylene, 5-10 parts of polypropylene, 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; mixing in a kneading machine for 8-12 minutes, and discharging when the mixing temperature is 135-150 DEG C; and feeding into a double-screw extruder, and sequentially performing double-screw plasticization and single-screw granulation, wherein the temperatures of all sections of the screws are as follows: the temperature of a charging section is 90-110 DEG C, the temperature of a conveying section is 120-130 DEG C, the temperature of a plasticization section is 130-140 DEG C, and the temperature of a machine head is 135-145 DEG C; and the granulation procedure adopts an air cooling and hot cutting process. Thus, the prepared sheath layer material is a new material and is greatly different from a core wire material in performance; and under the lubrication action of the ultra-high molecular weight silicone and the high-melting-point polyethylene wax in the sheath layer material, the sheath layer and the core wire can not be bonded, thereby ensuring the quality of a GJFJZY type multi-core indoor optical cable.

Description

technical field [0001] The invention relates to a preparation method of a special sheath material for a GJFJZY type multi-core indoor optical cable. Background technique [0002] In the prior art, the core wire of 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. Protective layer, so that 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 the sheath layer or core wire Damage will affect the 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 existing sheath layer or core wire The low-smoke and halogen-free material...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the core wire of 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. Protective layer, so that 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 the sheath layer or core wire Damaged, affecting fiber signal attenuation or service life