Patch for rapidly repairing damages of external insulating layers of thermal shrinkage wires and cables

Abstract

The invention discloses a patch for rapidly repairing damages of external insulating layers of thermal shrinkage wires and cables. The patch comprises an external layer and an internal layer, wherein the external layer is an insulating layer; and the internal layer is a hot melt adhesive layer. A preparation method is characterized by comprising the following steps: carrying out blending modification on the raw materials of the insulating layer, extruding the modified raw materials into a tubular shape by an extruder, then crosslinking, carrying out extension shaping after crosslinking to obtain the insulating layer, then carrying out adhesive application to obtain the hot melt adhesive layer and finally longitudinally cutting the tubular repair material to form a curly sheet. The patch has the following beneficial effects: without a free end, the patch can be used for rapidly repairing the damaged parts after the damaged parts are slightly washed and polished; the patch is suitable for various wire and cable external diameters even in an uninterrupted state, the process is simple and the repair quality of the wires and cables can be ensured; and as a radiation crosslinking technology is adopted, the service life of the patch can be at least more than 25 years, and at the same time the cost of the patch is lower than half the cost of zipper type thermal shrinkage products.

Description

technical field [0001] The invention relates to an insulating material for repairing, in particular to a rapid repair sheet for heat-shrinkable wire and cable outer insulation damage. Background technique [0002] Damage to the outer insulation layer of wires and cables is a common problem encountered by various enterprises. The usual remedy is to use electrical tape to repair the wire, or use a piece of heat shrinkable tube to repair the damaged part; It is repaired with zipper composite heat shrink patch. However, electrical tape is only suitable for insulation repair of low-voltage cables below 380V. At the same time, it will lose its viscosity after about one year of use; the repair of the heat-shrinkable tube needs to have a free end (one end can be inserted into the heat-shrinkable tube); The price (cost) of cable repair sheets is too high, the process is too complicated, and the construction time is long. The so-called zipper heat-shrinkable cable repair sheet is di...

AI Technical Summary

Problems solved by technology

Problems in extrusion molding: first, stretching after extrusion, on the one hand, the shrinkage rate is not enough (cannot fully shrink to the size of the blank), on the other hand, the stretching process will cause uneven thickness of the sheet, and extrusion molding It adopts post-glue method, and the thickness of the glue layer is not easy to control

However, the electrical insulating tape is generally used for one year, and its adhesive performance is greatly reduced, and it often falls off or loosens; the operation process of the zipper type composite insulating covering sheet is very complicated and the cost is high, and the repair of a damaged point often requires 1 It takes more than 1 hour to repair, and the cost often exceeds 100 yuan

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