Environment-friendly flame retardant semiconductive PVC sheathing compound used for ultra-pressure cable sheath

Abstract

The invention relates to a cable sheathing compound and a preparation method thereof, in particular to an environment-friendly flame retardant semiconductive PVC sheathing compound used for an ultra-pressure cable sheath and a preparation method thereof. The semiconductive PVC sheathing compound in the invention comprises PVC resins, plasticizers, an antioxidant, polyethylene wax, ethylene- vinyl acetate resins, a flame retardant a, a compound environment-friendly heat stabilizer, a flame retardant b, conductive carbon black a, a high efficient lubricant, nano calcium carbonate, conductive carbon black b and conductive metal powder. The preparation method of the invention comprises the following steps: firstly, stirring the plasticizer a, conductive carbon black a, nano calcium carbonate, conductive carbon black b, conductive metal powder and antioxidant in a low speed kneading machine; then mixing other constituents and stirring the constituents in a high speed kneading machine. Compared with the existing products, the semiconductive PVC sheathing compound in the invention helps to fully restrain the aging of PVC, improve the intensity and the line extrusion speed of the product, lower the volume resistance rate and has the excellent conduction performance, thus can be widely applied to the outer sheaths needed by the environment-friendly flame retardant ultra-pressure cables.

Description

technical field [0001] The invention relates to a cable sheath material and a preparation method thereof, in particular to an environment-friendly flame-retardant semi-conductive PVC sheath material for an ultra-high voltage cable sheath and a preparation method thereof. Background technique [0002] In the design of cable structure, especially in ultra-high voltage cables, if the outer sheath is made of a material with high insulation resistance, when multiple points cannot be grounded continuously, the sheath will form a dangerous position at a position far away from the site. voltage, can endanger the safe operation of the cable, and can also cause electric shock to the construction personnel, so the ultra-high voltage power cable needs to use a semi-conductive outer sheath, and its function is that the charge induced on the sheath can pass through the semi-conductive layer to the contact body (such as the earth) etc.) discharge, at the same time, the semi-conductive laye...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the semi-conductive layers of ultra-high voltage cables on the market are coated with graphite. The disadvantage of this structure is that the coating is relatively thin, and it is easy to damage and fall off during cable laying, polluting the surrounding environment, and seriously affecting the safety during cable installation. Normal detection, causing a lot of trouble to manufacturers and users

A more reasonable solution is to extrude a semiconductive layer on the outer sheath to replace graphite. Although there have been reports about some manufacturers using extruded semiconductive layer cables, there are few reports on the preparation method and process of semiconductive materials. , and does not have flame retardant properties, the application range is limited to a certain extent, at the same time, the preparation process of semi-conductive materials is unreasonable, the production pollution is large, and the volume resistivity is unstable

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