Graphene-doped polypropylene-based thermoplastic cable shielding material and preparation method thereof

Abstract

The invention relates to a graphene-doped polypropylene-based thermoplastic cable shielding material and a preparation method thereof, and the preparation method comprises the following steps: adding a polyethylene octylene co-elastomer into a first solvent to obtain a POE solution; adding graphene into a second solvent to obtain graphene slurry after ultrasonic dispersion; adding the graphene slurry into the POE solution, and carrying out suction filtration to obtain a flocculent mixture, so as to obtain a POE/graphene master batch; adding the polypropylene, the conductive carbon black, the POE/graphene master batch, the antioxidant and the coupling agent into an extruder, carrying out melt blending, carrying out water-cooling pelletizing, drying and dehydrating. According to the invention, graphene is added to form a synergistic effect with carbon black and improve the conductivity, and the graphene master batch is prepared by ultrasonic dispersion and a solution method, so that the problems of serious stacking and agglomeration of graphene layers are solved, better electrical properties and mechanical properties are obtained, and the conductivity of the graphene master batch is improved under the condition of meeting the conductivity. And a relatively low resistivity positive temperature effect is achieved.

Description

technical field [0001] The invention belongs to the field of cable semi-conductive shielding materials, in particular to a graphene-doped thermoplastic cable semi-conductive shielding material and a preparation method. Background technique [0002] Cross-linked polyethylene (XLPE) cables are currently the main medium and high voltage cables used in the power industry. Cross-linking enables polyethylene to obtain excellent thermal stability and mechanical properties, effectively improving the use of voltage levels and current carrying capacity, but after cross-linking The product changes from thermoplastic to thermosetting, which cannot be recycled after the cable life is exhausted, and it is difficult to dispose of, so it can only be buried or incinerated, causing serious environmental pollution and waste of resources, which does not meet the green development strategy proposed by the country; The cross-linking process in the three-layer co-extrusion production will produce ...

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Problems solved by technology

[0002] Cross-linked polyethylene (XLPE) cables are currently the main medium and high voltage cables used in the power industry. Cross-linking enables polyethylene to obtain excellent thermal stability and mechanical properties, effectively improving the use of voltage levels and current carrying capacity, but after cross-linking The product changes from thermoplastic to thermosetting, which cannot be recycled after the cable life is exhausted, and it is difficult to dispose of, so it can only be buried or incinerated, causing serious environmental pollution and waste of resources, which does not meet the green development strategy proposed by the country; The cross-linking process in the three-layer co-extrusion production will produce harmful cross-linking by-products such as methane and cumyl alcohol, which will form defects when the by-products accumulate in the cable, causing electric field distortion during operation, causing breakdown of the cable and eventually making the insulation failure , the control of by-products requires strict and precise temperature control, which increases the difficulty and cost of cable production

The development of thermoplastic cables has attracted more and more attention. At present, the main direction of thermoplastic cable research is polypropylene materials. Many scholars have carried out the development of polypropylene cable insulation materials, but there are few studies on the production of thermoplastic shielding materials. , the cable shielding material requires a

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