Magnesium-aluminum alloy wire hemming type semi-conductive buffer water-blocking tape special for 110KV or above ultrahigh-voltage cable, semi-conductive water-blocking glue and method

Abstract

The invention provides a magnesium-aluminum alloy wire hemming type semi-conductive buffer water-blocking tape special for an ultrahigh-voltage cable of 110 KV or above, a semi-conductive water-blocking colloid and a method. The semi-conductive water-resistant colloid comprises ethylene glycol, butyl acrylate, methyl acrylate, conductive carbon black, a dispersing agent and water-absorbent resin. The water-blocking tape comprises fluffy body buffer cotton, coated tin-plated magnesium-aluminum alloy wires and water-blocking layers, the coated tin-plated magnesium-aluminum alloy wires are sewn on the fluffy body buffer cotton, and the water-blocking layers are arranged on the two sides of the fluffy body buffer cotton. According to the invention, the coated tin-plated magnesium-aluminum alloy wires are adopted, so that the semi-conductivity is obviously improved, and the volume resistance is obviously reduced. Besides, the longitudinal tensile strength is improved and reaches more than 110N / cm, which is more than 2.2 times of the tensile strength of the current like products, and the high-speed wrapping production efficiency is improved by more than 50%. The conductive adhesive prepared from ethylene glycol does not contain water, so that the surface of a conductor is not oxidized and corroded; under the same condition, the volatilization speed of alcohol is higher than that of water, so that the energy is saved and the consumption is reduced by more than 40%.

Description

technical field [0001] The invention relates to a magnesium-aluminum alloy wire seamed semiconductive buffer water-blocking belt, a semiconductive resistor hydrocolloid and a preparation method thereof; more specifically, a magnesium-aluminum alloy wire seamed semiconductive buffer water-blocking tape The water belt is specially used for the internal wrapping of ultra-high voltage cables with voltage levels of 110KV, 220KV and above (outside the insulating shielding layer, and the inner layer of the corrugated aluminum sheath), to insulate between the semi-conductive shielding layer and the metal shielding layer, and maintain good electrical contact , has the function of cushioning and longitudinal water resistance. Background technique [0002] For extra-high voltage cables with voltage levels of 110KV, 220KV and above, the internal structure includes a buffer water-blocking tape. In the general structure, the outer layer of the buffer water blocking tape is an insulating ...

AI Technical Summary

Problems solved by technology

First of all, it is prone to corrosion problems. This is because the water-based colloid is coated and dried, and the water content is high; in addition, the domestic water-absorbent resin is corrosive to Al and Cu.

Furthermore, its semi-conductivity is poor. This is because the surface of the fiber is coated with a conductive "C", and there are colloid and insulating grade polyester fibers between the conductive "C" and "C", resulting in a large resistance value.

In addition, its water resistance is poor. Since there is only one water blocking layer, it is limited by the material and quantity of the water-absorbing powder; since the water-based component colloid is used as the binder, it has slightly swelled and adsorbed on the water-absorbing powder.

Decrease the water absorption performance of the water-absorbent powder

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