Cross-linkable polyolefin insulating composition for extreme-cold resisting wires and cables and preparation method of cross-linkable polyolefin insulating composition

Abstract

The invention relates to an insulating composition, in particular to a cross-linkable polyolefin insulating composition for extreme-cold resisting wires and cables. The cross-linkable polyolefin insulating composition is prepared from the following components in parts by weight: 40 to 60 parts of metallocene polyethylene (MPE), 20 to 40 parts of ethylene-ethyl acrylate copolymer (EEA), 20 to 40 parts of ethylene-octene copolymer (POE), 1.5 to 2.5 parts of dicumyl peroxide (DCP) and 0.2 to 0.4 part of 4,4'-thio-bis (6-tert-butyl-3-methylphenol) antioxidant 300. A preparation method of the composition comprises the following steps: weighing the MPE, the EEA, the POE, TAIC (Triallylisocyanurate) and the antioxidant 300 according to formula proportions, simultaneously adding the materials into a mixer, and uniformly mixing at the temperature of 110 to 120 DEG C to obtain a mixed material; enabling the mixed material to enter a single screw granulator for granulating; cooling obtained aggregates by using water, conveying the cooled aggregates into a centrifugal dehydrator for centrifugally dehydrating, and then carrying out drying treatment; weighing and packaging the dried aggregates to obtain a finished product of the cross-linkable polyolefin insulating composition for the extreme-cold resisting wires and cables. The cross-linkable polyolefin insulating composition disclosed by the invention has the advantages of excellent low-temperature resistance, simple processing technique, good electric properties and moderate price.

Description

technical field [0001] The present invention relates to an insulating composition, in particular to an insulating composition for extremely cold-resistant wires and cables. Background technique [0002] my country will cooperate to build a shore-based observation station in the Arctic and a scientific research station in the Antarctic, build an advanced icebreaker, and improve the aviation capabilities of the Antarctic. Polar research and development has been included in the national plan, and its strategic, economic, environmental and technological significance is of great significance. [0003] Electric energy is an important guarantee for polar research and development, so wires and cables that can adapt to the extreme cold environment are essential for the construction of polar scientific research stations. Considering the climate conditions in the polar regions, wires and cables that can be installed and operated at ‒80°C are needed in the future, but there is currentl...

AI Technical Summary

Problems solved by technology

However, this kind of silicone rubber is very expensive and cannot be produced continuously in large quantities. At present, it can only be synthesized in small batches in reactors, and the product performance uniformity is poor, so it is not suitable for the production of large-scale wire and cable.

[0009] To sum up, the existing plastic materials are difficult to meet the requirements of good processing performance, strong cold resistance, excellent electrical performance and moderate price.