Silane cross-linked peelable semi-conductive external shielding material and preparation method thereof

Abstract

The invention discloses a silane cross-linked peelable semi-conductive external shielding material and a preparation method thereof. The silane cross-linked peelable semi-conductive external shieldingmaterial is prepared by mixing a grafted material A and a catalytic material B with a mass ratio of (5 to 9) to 1 and then cross-linking in warm water, wherein the grafted material A comprises the following components in parts by weight: 100 parts of ethylene-vinyl acetate copolymer, 1 to 4 parts of silane, 0.2 to 1 part of an initiator, 0.1 to 1 part of an antioxidant, and 5 to 10 parts of a lubricant; the catalytic material B comprises the following components in parts by weight: 100 parts of ethylene-vinyl acetate copolymer, 100 to 150 parts of conductive filler, 10 to 20 parts of a lubricant, 5 to 10 parts of a stripping agent, 1 to 5 parts of a dispersant, 0.5 to 3 parts of a catalyst, and 0.5 to 2 parts of an antioxidant; the ethylene-vinyl acetate copolymer has a VA content of 25%to 30%, a melt flow rate of 2.3 to 7.5 g / 10min (the test conditions are 190 DEG C and 2.16 kg, the same below). The silane cross-linked peelable semi-conductive external shielding material disclosed by the invention has good electrical conductivity, and in particular, can ensure effective cross-linking of the product.

Description

technical field [0001] The invention relates to a semiconductive modified material for electric wires and cables, in particular to a silane crosslinked peelable semiconductive outer shielding material and a preparation method thereof. Background technique [0002] With the development of society and economy, power consumption continues to increase, and there are more and more high-voltage and ultra-high-voltage power supplies. In high-voltage and ultra-high-voltage power supply cables, semi-conductive shielding materials are indispensable materials. Their main functions are to improve the radial distribution of the electric field inside the cable and to homogenize the electric field, so as to improve the electric strength of the cable and directly or indirectly improve the service life of the cable. . In the shielding material standard, there are many types of shielding materials, but the peroxide cross-linked shielding materials still account for the absolute majority at h...

AI Technical Summary

Problems solved by technology

However, in the mixing ratio of materials A and B, material B accounts for a relatively large proportion, and at the same time, the carbon black content in material A is relatively high, resulting in less cross-linkable parts in the material, making it difficult to form effective cross-linked products, and difficult to guarantee The product has passed the immersion test to verify the effective cross-linking of the product

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