Patch for rapidly repairing damages of external insulating layers of thermal shrinkage wires and cables
A technology of external insulation and repair sheet, applied in the direction of insulators, insulators, circuits, etc., can solve the problems of complex operation process, difficult control of adhesive layer thickness, and reduced adhesion performance, and achieve the effect of simple process
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[0019] The present invention will be further explained below in conjunction with specific embodiments.
[0020] Such as figure 1 As shown, a quick repair sheet for external insulation damage of heat-shrinkable wires and cables is composed of an outer layer and an inner layer. The outer layer is an insulating layer 1 and the inner layer is a hot melt adhesive layer 2. The preparation method is:
[0021] 1) Blending and modifying the raw materials of the insulating layer, blending in a 600-900 rpm mixer for 20-30 minutes, and then granulating and extruding on a two-stage parallel twin screw extruder.
[0022] 2) Extruded into a tube through an extruder, the length of the straight section of the die and mandrel in the extrusion molding is 25-40mm, and the temperature during extrusion is controlled at 140-170℃. The extrusion specifications of several products are:
[0023]
[0024] 3) Then cross-linking, using electron beam radiation cross-linking, the degree of cross-linking is 55-65%...
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