Ultraviolet light deeply crosslinked ethylene-propylene-diene mischpolymere rubber cable material and preparation method of insulation or protective sleeve layer thereof

Abstract

The invention relates to an ultraviolet light deeply crosslinked ethylene-propylene-diene mischpolymere rubber cable material and a preparation method of an insulation and protective sleeve layer thereof. The invention is characterized in that: ethylene-propylene-diene mischpolymere rubber and grafting modified ethylene-propylene-diene mischpolymere rubber are used as a base stock, an inorganic filler, a photoinitiation system consisting of a cation photoinitiator and a radical photoinitiator and the like are added, and the cable material is made by blending and extrusion; and a coated cable insulation or protective sleeve layer is subjected to molten online continuous ultraviolet light radiation in an ultraviolet radiation crosslinking equipment which is provided with a thermoelectron excited medium voltage mercury arc lamp or an H-type, D-type or V-type microwave-excited electrodeless lamp as a special light source to obtain a deeply and uniformly crosslinked ethylene-propylene-diene mischpolymere rubber cable insulation or protective sleeve layer. The cable material and the preparation technique have the advantages that: the needed crosslinking equipment is low in investment; the process is simple; the operation and maintenance are convenient; the production efficiency is high; the product cost is low and product quality is high; and energy conservation and environment protection are realized. Thus, the cable material and the preparation technique can be widely used for manufacturing high-performance special crosslinked rubber wire and cable products and the like.

Description

Technical field [0001] The invention belongs to the field of rubber cross-linked cables, and particularly relates to an insulating or sheathing material for ultraviolet light deep cross-linking EPDM cables and a preparation method of the insulating or sheathing layer. Background technique [0002] EPDM rubber (EPDM) is widely used as wire and cable insulation or sheath material due to its excellent electrical properties, excellent heat resistance and aging resistance, and good low temperature flexibility, especially for mining cables, marine cables and others Special cables. The traditional cross-linking methods for the insulation or sheath of EPDM rubber wire and cable mainly include peroxide chemical cross-linking method, high-energy radiation cross-linking method and silane cross-linking method. European patent EP1453866 discloses that a material system composed of EPDM, calcined kaolin, low-density polyethylene, silane coupling agent and paraffin wax is used to prepare cross...

AI Technical Summary

Problems solved by technology

[0005] The most commonly used type of UV crosslinking of polymers is free radical photoinitiators, such as hydrogen abstraction type photoinitiator benzophenone (BP) and cracking type photoinitiator benzoin dimethyl ether (BDK), etc. They generate free radicals after absorbing ultraviolet light and initiate crosslinking reactions, but due to the weak penetrating power of ultraviolet light, it is difficult to penetrate deep into the material to initiate free radical crosslinking reactions, especially in thicker samples containing a large amount of inorganic fillers , leading to a reduction in the efficiency of photo-induced crosslinking and greatly limiting the application in cables that require thicker insulation or sheath layers