After-absorbing technique for electric cable material

Abstract

The invention relates to a production process of medium-pressure and high-pressure power cable insulation material. The invention aims at solving the technical problem that the process has the characteristics of the effective filtration of impurities in the material, the good compounding uniformity of finished products and the good performances of the finished products. The invention has a technical proposal of post absorption process of the cable material, orderly comprising the following steps: 1) filtration and purification: polyethylene, antioxidant and additive are mixed, extruded out ofa twin-screw extruder and treated through filtration and purification; the temperature for extrusion and filtration is 160 DEG C to 200 DEG C; then a pelletizer is used for preparing granules; 2) homogenizing and absorption: the prepared granules are put into an absorption kettle; cross-linker is added according to the proportion for homogenizing and absorption; the homogenizing temperature is 50DEG C to 90 DEG C; the homogenizing time is 10 hours to 30 hours; then the products are cooled and packaged. The item number of meshes of the used filter screen for filtration is 200 items to 800 items. The underwater cutting material is used in the pelletizer when preparing the granules.

Description

technical field [0001] The invention relates to a production process of polymer materials, in particular to a production process of medium and high voltage power cable insulation materials. Background technique [0002] At present, the production of chemical cross-linked cable materials for medium and high voltage power cables (medium voltage power cables refer to cables with a working voltage in the range of 1kV to 35kV, and high voltage power cables refer to cables with a working voltage above 66kV) mainly uses low temperature mixing. Refining process; the process includes: batching→mixing→granulation→centrifugal dehydration→boiling drying→cooling→inspection. Its main defect is: the cross-linking agent is injected online before mixing, so there will be pre-cross-linking phenomenon in the process of processing, and its product quality is affected to a certain extent, which is not suitable for producing high-grade products; and due to cross-linking Due to the presence of ad...

AI Technical Summary

Problems solved by technology

Its main defect is: the cross-linking agent is injected online before mixing, so there will be pre-cross-linking phenomenon in the process of processing, and its product quality is affected to a certain extent, which is not suitable for producing high-grade products; and due to cross-linking Due to the presence of additives, the mixing of raw materials can only be carried out at a temperature lower than the safe temperature at which the crosslinking agent decomposes. There are problems such as the impurity in the raw materials cannot be filtered, and the additives with high melting points cannot be effectively and uniformly dispersed, which affects the Performance and quality of cable materials

If a filter is installed, the low-temperature and high-viscosity melt cannot pass through the filter at all