Extra high voltage composite insulator polyurethane glass fiber core rod, and preparation method thereof

Abstract

The invention discloses an extra high voltage composite insulator polyurethane glass fiber core rod, and a preparation method thereof. According to the preparation method, injection pultrusion is adopted for delivering continuous alkali-free glass fiber twistless roving and polyurethane resin around the continuous alkali-free glass fiber twistless roving formed through uniform dipping through a pultrusion mould at a certain heating temperature so as to obtain a extra high voltage composite insulator polyurethane glass fiber core rod of a needed size. Compared with the prior art, the beneficialeffects are that: the manufacturing cost is low, the cost performance is relatively high, the production efficiency is high, excellent mechanical performance, heat performance, and heating aging performance are achieved, and excellent wear resistance, high toughness, and aging resistance are achieved. The preparation method is capable of solving problems in the prior art that because of poor epoxy glass fiber core rod toughness, torsion strength, and shearing resistance, applications of conventional extra high voltage composite insulators in strain insulator-string is impossible to realize, and production efficiency is low.

Description

technical field [0001] The invention relates to a composite mandrel for a composite insulator of an extra-high voltage transmission line. Background technique [0002] Due to the transmission capacity and surface field strength control requirements of UHV transmission lines, wires with larger cross-sections are generally used. Larger cross-sections mean larger weights of wires, that is, UHV composite insulators will also bear greater mechanical loads, and composite insulators mechanically The load is mainly borne by the composite mandrel. At present, the core rods for composite insulators are mainly formed by pultrusion of glass fiber impregnated with epoxy resin. From the material point of view, the epoxy resin matrix is ​​relatively brittle and insufficient in toughness; The axial tensile strength is very high, but the radial bending, torsion, shearing, and impact strength are poor, so it cannot be used for tension strings, and the production efficiency is low. This featur...

AI Technical Summary

Problems solved by technology

At present, the core rods for composite insulators are mainly formed by pultrusion of glass fiber impregnated with epoxy resin. From the material point of view, the epoxy resin matrix is ​​relatively brittle and insufficient in toughness; The axial tensile strength is very high, but the radial bending, torsion, shearing, and impact strength are poor, so it cannot be used for tension strings, and the production efficiency is low. This feature of the existing composite insulator mandrel greatly limits The application field of composite insulators is limited, and it cannot meet the requirements of UHV power grid construction in my country

Poor toughness, torsion, and shear resistance cannot be used for tension strings and their production efficiency is low