Manufacture method of high-level chemical cross-linked polyethylene cable insulation materials

Abstract

The invention relates to a manufacture method of high-level chemical cross-linked polyethylene cable insulation materials, which includes (1) leaching polyethylene, leading the polyethylene to a raw material bin after vibration and purification wind leaching, and obtaining processed polyethylene, (2) adding composite antioxidant and the processed polyethylene in a reciprocating type extruder for sufficient mixing, homogenizing and devolatilizing to manufacture molten mixture, and placing the molten mixture in a melt pump for pressurizing and in a filter for filtering to obtain super clean molten objects, (3) performing spray eccentric grainsized cutting on the super clean molten objects, removing water through a vibration screen, weighing the super clean molten objects, drying the super clean molten objects and removing water through a rocking machine, adding cross-linking agent, and finally hot dipping and packaging the super clean molten objects. The manufacture method of the high-level chemical cross-linked polyethylene cable insulation materials is simple, low in cost, free of new equipment requirement and capable of massive manufacture. The manufacture method of the high-level chemical cross-linked polyethylene cable insulation materials overcomes defects that the traditional filter screen cannot filter impurities with more than 70 mum and pre-cross-linking caused by adding the cross-linking agent in the traditional bolt machine, and is stable in product quality.

Description

technical field [0001] The invention belongs to the field of preparation of cable insulating materials, in particular to a production method of high-grade cross-linked polyethylene cable insulating materials. Background technique [0002] Wire and cable are key components of power transmission, and the insulating material is one of the key factors for cable withstand voltage. Polymer materials have excellent insulation properties and processability, and have become the first choice for cable insulation materials. And cross-linked polyethylene has become an insulating material for high-voltage cables that has developed rapidly in recent years because of its unique insulation properties, excellent mechanical properties, and heat resistance properties, such as high overload temperature, service temperature, and short-circuit temperature. At present, the 110-220kV high-voltage cables in the world basically use cross-linked polyethylene insulation layers, and some AC lines of 50...

AI Technical Summary

Problems solved by technology

Medium-voltage (35kV and below) polymer insulating cable materials are generally not far from the level of advanced countries in the world, but high-grade materials of 110kV and above have not been produced in China so far, and they are all imported from abroad.