PBT (polybutylene terephthalate) material for optical cable and preparation method thereof

Abstract

The invention belongs to the technical field of optical cable materials, and particularly relates to a PBT (polybutylene terephthalate) material for optical cables. The PBT material is characterized by comprising following raw materials in parts by weight: 35-50 parts of PBT, 20-30 parts of polypropylene, 6-20 parts of polyethylene, 2-4 parts of aluminum hydroxide, 4-6 parts of triphenyl phosphate, 3-5 parts of talcum powder, 1-3 parts of mica powder, 3-9 parts of maleic anhydride, 2-6 parts of decabromodiphenylethane, 2-4 parts of white oil, 1-3 parts of zinc oxide, 2-4 parts of titanium dioxide and 2-6 parts of polyethylene wax. The invention also discloses a preparation method of the PBT material. The PBT material has the main beneficial effects of low density, small thermal contraction, high melt index, high lateral pressure resistance, and strong resistance to high and low temperatures; and the preparation method is simple and easy to control.

Description

technical field [0001] The invention belongs to the technical field of optical cable materials, and in particular relates to a PBT material for optical cables and a preparation method. Background technique [0002] PBT is mainly used in the extrusion of loose tubes in optical cables. The PBT material is heated, spirally sheared, compressed, and melted in the extruder, and then stretched and cooled to form a loose tube. At the same time, it is placed in the loose tube Optical fiber or optical fiber tape, if necessary, fill the gap in the tube with water-blocking ointment, water-blocking powder, water-blocking yarn and other water-blocking materials. [0003] In China, the mechanical and physical properties of PBT need to meet the requirements of the Ministry of Posts and Telecommunications industry standard "YD1118.1-2001 Secondary Coating Materials for Optical Fiber Part One: Polybutylene Terephthalate". Manufacturers of PBT materials mainly include: German HOLZ Company, G...

AI Technical Summary

Problems solved by technology

[0003]In China, the mechanical and physical properties of PBT need to meet the industry standard of the Ministry of Posts and Telecommunications "YD1118.1-2001 Secondary coating materials for optical fibers Part I: Polyterephthalic acid Butylene Glycol Ester", the existing manufacturers of PBT materials for optical cables on the market mainly include: German HOLZ Company, German BASF Company, Jiangyin Aikesen Company, Suzhou Yingmao Company, Shanghai Dehong Company, Yangzhou Hongsen Company etc.; although in the production process of the loose tube, there are hot and cold water tanks for cooling, even if the length of the water tank is extended infinitely, the fastest production speed that PBT in the prior art can achieve is only 250m / min; this greatly restricts Improve the production capacity of optical cable manufacturers

On the other hand, in high-speed production, although the loose tube has been sufficiently cooled, the late shrinkage after production is still quite large. The main reason is that the crystallization is not sufficient

On the other hand, the lateral pressure resistance of the loose tube produced by the existing PBT is not ideal, especially after the large-diameter loose tube is produced, the pressure resistance of the loose tube is quite poor