Silane crosslinked polyethylene insulating material for heating cable and preparation method and application thereof

Abstract

The invention discloses a silane crosslinked polyethylene insulating material for a heating cable and a preparation method and application thereof. The insulating material is formed by mixing a silanegrafting material and crosslinking catalyst masterbatch, the silane grafting material comprises a crosslinking catalyst, a second lubricant and a second oxidant, polyolefin resin is composed of firsthigh-density polyethylene, double-peak polyethylene and polyethylene, and the crosslinking catalyst masterbatch comprises second high-density polyethylene and linear low-density polyethylene. The preparation method includes: respectively preparing the silane grafting material and the crosslinking catalyst masterbatch, and proportionally packaging to obtain the insulating material. The applicationrefers to application of the insulating material in producing the heating cable. The insulating material can be used for a long time at 125 DEG C while maintaining excellent physical and mechanical performance and is safe, environment-friendly and low in cost.

Description

technical field [0001] The invention belongs to the field of heating cables, and in particular relates to a silane crosslinked polyethylene insulating material for heating cables and a preparation method and application thereof. Background technique [0002] Heating cables are made of cable structures, use electricity as energy, and use resistance wires to generate heat, so as to achieve heating and heat preservation effects, and are widely used in floor heating, snow melting and ice melting. The low-end products of the existing heating cable insulation layer are mainly non-crosslinked ordinary polyethylene and polyvinyl chloride, but the high temperature resistance is relatively poor, and polyvinyl chloride is still lacking in environmental protection; the high-end is now mainly using Although polytetrafluoroethylene and silicone rubber have good heat resistance, they are expensive and unfavorable for large-scale application. [0003] Therefore, the current market needs an...

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Problems solved by technology

Cross-linking modification is an important means to improve the heat resistance and weather resistance of polyethylene. Among them, silane cross-linking is one of the cross-linking methods of polyethylene. Some heating cable manufacturers are trying to use silane cross-linking polyethylene. Insulating materials are used in the manufacture of heating cables. However, the current temperature resistance of silane cross-linked polyethylene insulating materials for cables is only about 90°C, which is only suitable for power cables and cannot meet the needs of heating cables. Chinese utility model patent CN204145784U, which discloses A single-conductor heating cable with a silane cross-linked polyethylene insulating layer is provided, which has an alloy heating wire, the alloy heating wire is wrapped with a silane cross-linked polyethylene insulating layer, and the silane cross-linked polyethylene insulating layer is wrapped with a filling layer. A number of metal grounding wires are evenly distributed in the filling layer, and the filling layer is wrapped with a metal electromagnetic shielding layer, and the metal electromagnetic shielding layer is wrapped with a PVC sheath. This patent mentions that it can work at 100-120°C for a long time, but the actual production The silane cross-linked polyethylene commonly used in the process cannot achieve this effect, and the temperature resistance level is only about 90°C

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