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

An environmentally friendly, cable protection technology, applied in the direction of insulated cables, cables, conductors, etc., can solve the problems of few preparation methods and processes of semiconductive materials, unreasonable preparation process of semiconductive materials, affecting the normal detection of cables, etc., to ensure long-term Stability, improved external lubrication, less pollution

Inactive Publication Date: 2012-07-04
SHANGHAI KAIBO SPECIAL CABLE FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Example 1, an environment-friendly flame-retardant semi-conductive PVC sheathing material for an ultra-high voltage cable sheath, based on 100 kilograms of PVC resin, 15 kilograms of ethylene-vinyl acetate resin, 40 kilograms of dioctyl phthalate, and antimony trioxide 2.5 kg, 20 kg of magnesium hydroxide, 5 kg of composite environmental-friendly heat stabilizer (calcium-zinc composite stabilizer), 8 kg of dioctyl terephthalate, 0.2 kg of antioxidant, 0.3 kg of polyethylene wax, high-efficiency lubricant G60 0.5 kg, conductive carbon black 40B2 25 kg, nano calcium carbonate 12 kg, conductive carbon black 350G 10 kg, conductive zinc powder 5 kg.

[0040] The preparation method is: a, with 40 kilograms of dioctyl phthalate, 225 kilograms of conductive carbon black 40B, 5 kilograms of conductive zinc powder, 12 kilograms of nano-calcium carbonate, 10 kilograms of conductive carbon black 350G, and 0.2 kilograms of antioxidant. Stir in the low-speed kneader (the stirring spe...

Embodiment 2

[0041] Embodiment 2, an environment-friendly flame-retardant semi-conductive PVC sheath material for an ultra-high voltage cable sheath, based on 100 kilograms of PVC resin, 18 kilograms of ethylene-vinyl acetate resin, 35 kilograms of dioctyl phthalate, and antimony trioxide 2 kg, 20 kg of aluminum hydroxide, 5 kg of composite environmental-friendly heat stabilizer (organotin stabilizer), 7 kg of dioctyl terephthalate, 0.2 kg of antioxidant, 0.3 kg of polyethylene wax, high-efficiency lubricant G60 0.5 kg, conductive carbon black 40B2 25 kg, nano calcium carbonate 12 kg, conductive carbon black 350G 7 kg, conductive zinc powder 7 kg.

[0042] The preparation method is: a, with dioctyl phthalate, conductive carbon black 40B2, 7 kilograms of conductive zinc powder, nano-calcium carbonate, conductive carbon black 350G, antioxidant, put into low-speed kneader and stir (low-speed The stirring speed of the kneader is 40 rpm; the temperature during kneading is 90°C; the kneading tim...

Embodiment 3

[0043]Embodiment 3, environment-friendly flame-retardant semi-conductive PVC sheathing material for ultra-high voltage cable sheath, based on 100 kg of PVC resin, 10 kg of ethylene-vinyl acetate resin, 30 kg of dioctyl phthalate, antimony trioxide 1 kg, 10 kg of magnesium hydroxide, 2 kg of composite environmental heat stabilizer, 5 kg of dioctyl terephthalate, 0.1 kg of antioxidant, 0.2 kg of polyethylene wax, 0.7 kg of high-efficiency lubricant G60, conductive carbon black 10 kg of 40B2, 10 kg of nano-calcium carbonate, 5 kg of conductive carbon black 350G, and 7.5 kg of conductive zinc powder. The preparation method is the same as in Example 1.

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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- vinylacetate 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/06C08K13/02C08K3/04C08K3/26C08K3/08C08K3/22B29B9/06H01B7/17
Inventor 程健黄志林
Owner SHANGHAI KAIBO SPECIAL CABLE FACTORY