Formula of insulating material low in loss and high in phase stability, and method for preparing insulating conductor core thereof

Abstract

The invention discloses the formula of an insulating material low in loss and high in phase stability, and a method for preparing an insulating conductor core thereof. According to the formula, the material comprises the following raw materials in percentage: 66-67% of dispersion polymerized polytetrafluoroethylene resin, 15-16% of aromatic solvent, 1.0-1.5% of white polytetrafluoroethylene color paste, and 16.5-17.0% of silicon dioxide powders. The method for preparing the insulating conductor core comprises the steps of mixing the above raw materials, sieving the obtained mixture through a sieve to obtain particles, putting obtained particles in a plastic and sealed wild-mouth bottle, shaking up the particles, placing the particles in an aging room for 48-72 hours at the environment temperature of 25-40 DEG C, pouring the particles in precast rod molding equipment to form hollow and cylindrical embryonal rods of 1.2-1.3 mm in length, 15.8-16.2 mm in internal diameter and 76.0-76.2 mm in external diameter, inserting the embryonal rods in a polytetrafluoroethylene extruding production line, driving an internal conductor to pass through a host and an internal mold of 1.50-1.55 mm, installing an outer film of 4.2-4.3 mm, starting the host and a traction part, tightly coating the cylindrical embryonal rods onto the surface of the conductor, adjusting the traction and extrusion speed, controlling the external diameter of the conductor to be 4.40-4.45 mm before the sintering process, and completing the preparation of the conductor core through a sintering region.

Description

technical field [0001] The invention relates to a formula of a low-loss high-phase-stable insulating material and a preparation method for an insulating wire core. Background technique [0002] The current preparation method for insulating cores of cables with low loss and high phase stability is to achieve low loss and high phase stability through the wrapping process of microporous polytetrafluoroethylene film, but this method is difficult to process, and the cost of raw materials is high. Since it has been monopolized by foreign countries, it is currently in its infancy in China. The processing technology of ordinary PTFE materials and silicon dioxide is simple, but each has its own shortcomings. Although ordinary PTFE materials meet the requirements of low loss, the temperature phase is at 1800PPM , which is much higher than the 750PPM requirements of foreign low-loss high-phase stability cables; although the temperature phase of silicon dioxide is 300PPM, the loss is 2-...

AI Technical Summary

Problems solved by technology

[0002] The current preparation method for insulating cores of cables with low loss and high phase stability is to achieve low loss and high phase stability through the wrapping process of microporous polytetrafluoroethylene film, but this method is difficult to process, and the cost of raw materials is high. Since it has been monopolized by foreign countries, it is currently in its infancy in China. The processing technology of ordinary PTFE materials and silicon dioxide is simple, but each has its own shortcomings. Although ordinary PTFE materials meet the requirements of low loss, the temperature phase is at 1800PPM , which is much higher than the 750PPM requirements of foreign low-loss high-phase stability cables; although the temperature phase of silicon dioxide is 300PPM, the loss is 2-3 times that of polytetrafluoroethylene