Low-retraction silicane XLPE (Cross Linked Polyethylene) insulating material of 10 KV and below applicable to extrusion one-step method

Abstract

The invention relates to a low-retraction silicane XLPE (Cross Linked Polyethylene) insulating material of 10 KV and below applicable to an extrusion one-step method. The low-retraction silicane XLPEinsulating material comprises the following components in parts by weight: 100 parts of linear low-density polyethylene, 1-1.5 parts of silicane, 0.04-0.10 part of initiator, 0.05-0.15 part of antioxidant, 0.01-0.05 part of anti-copper agent, 0.02-0.15 part of catalyst and 0.10-0.50 part of lubricant. The insulating material produced according to the invention is applicable to the process that the silicane, the initiator, the catalyst and the like are directly added into a same extruder for granulation by the one-step method, so that the insulating shrinkage test performance of a silicane XLPE insulating cable of 10 KV and below is improved, and meanwhile, insulating shrinkage test of the silicane XLPE insulating cable of 10 KV and below produced by using an extrusion mold can extremely easily reach index requirements.

Description

technical field [0001] The invention relates to an XLPE insulating material for cables, in particular to a 10KV and lower low-retraction silane XLPE insulating material suitable for extrusion-type one-step production. Background technique [0002] Polyethylene is a high-quality chemical raw material. Through the cross-linking reaction, the polyethylene molecule changes from a two-dimensional structure to a three-dimensional network structure. The chemical and physical properties of the material are correspondingly enhanced, and the temperature and pressure resistance performance is improved. The material is cross-linked polyethylene, usually represented by its English abbreviation XLPE. [0003] The cross-linking methods of polyethylene include physical cross-linking, that is, radiation cross-linking and chemical cross-linking. Chemical crosslinking is divided into two types: silane crosslinking and peroxide crosslinking. [0004] At present, the production process of cros...

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Problems solved by technology

[0016] Chinese invention application 200510026418.0 discloses a "silane cross-linked low-shrinkage polyethylene plastic and its preparation method and application", which discloses two-step silane cross-linked polyethylene, not one-step silane cross-linked polyethylene; it discloses The process is suitable for production by extrusion dies, but not by extrusion dies; the base material it discloses is a combination of several resins, not a single resin; it does not disclose the specific grades of base resins, types of additives and The indicated range of dosage is too wide, and the actual reference value is not great

[0017] Chinese invention application 201010160172 discloses a "one-step silane cross-linked polyethylene cable material", which is not a low-retraction type silane cross-linked polyethylene cable material with an insulation shrinkage rate below 4%; the base material it discloses is The two resins are used together, not a single resin; it does not disclose the specific grade of the base resin, and the reference value is not great

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