Polybutylene terephthalate (PBT) material special for optical cables and band cables and manufacturing method of PBT material

Abstract

The invention relates to a polybutylene terephthalate (PBT) material special for optical cables and band cables. The PBT material is characterized by comprising the following materials in percentage by weight: 90 to 95 percent of PBT, 3 to 8 percent of polycarbonate, 1 to 5 percent of polypropylene, 0.01 to 0.05 percent of fluorescent whitening agent and 0.01 to 0.05 percent of composite catalyst, wherein the composite catalyst is formed by mixing organic tin compound and tetraisopropyl titanate in a ratio of (0.4-1): (0.6-1). The method comprises the following steps of: adding the raw materials into a stainless steel vacuum polymerization pot in a ratio, performing one-pot composition aggregation under the conditions that the vacuum degree is -0.2 to -0.06MPa, the reaction temperature is 150 to 250 DEG C and the reaction time is 6 to 16 hours, and cooling and packing to obtain the PBT material. The PBT material has the advantages of high molecular weight, high strength, high toughness, low shrinkage and good processing technical performance, and meets the requirements of the optical cables and the band cables on the special material.

Description

technical field [0001] The invention relates to a special PBT material for an optical cable ribbon and a manufacturing method thereof. Background technique [0002] The special PBT material for optical cables is modified by PBT resin and polymerized through special processing technology. The chemical name of PBT (polybutyiene terephthalate) is polybutylene terephthalate. [0003] Since ordinary PBT resin material chips are characterized by small molecular weight, low intrinsic viscosity, high melt flow rate, and low mechanical strength, they cannot be directly used as optical cable ribbons. In recent years, some domestic scientific research institutions are also conducting research and technical research. The specific method is to add some chain extenders, antioxidants, whitening agents and other additives to ordinary PBT resin slices to increase the viscosity and viscosity of PBT resin. Strength, improve its performance, used for the secondary coating of quartz optical fib...

AI Technical Summary

Problems solved by technology

[0003] Because the common type of PBT resin material chip is characterized by small molecular weight, low intrinsic viscosity, high melt flow rate and low mechanical strength, it cannot be directly used as an optical fiber cable.

In recent years, some domestic scientific research institutions are also conducting research and technical research. The specific method is to add some chain extenders, antioxidants, whitening agents and other additives to ordinary PBT resin slices to increase the viscosity and viscosity of PBT resin. Strength, improve its performance, used for the secondary coating of quartz optical fiber, but the reaction performance is not stable enough in practical applications, the molecular weight distribution area is relatively large, and at the same time, some additives will be partially decomposed under high temperature conditions, resulting in irritation Odor gas, additives and molecules in PBT resin are difficult to completely react in a short time. At the same time, because the new type of optical cable requires the lateral compressive strength of the material to be greater than 1500Mpa, the elongation at break is greater than 200%, and the shrinkage rate is less than 0.1‰. Existing PBT materials have low strength, poor toughness, large shrinkage, poor process stability, and cannot meet these performance requirements at the same time, so their application prospects are limited to a certain extent

In addition, the traditional organic synthesis is to react step by step, with many steps, long reaction time, low yield, poor selectivity, and complicated operation