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Polypropylene-based high-voltage direct-current cable material and preparation method thereof

A high-voltage DC, polypropylene-based technology, used in circuits, electrical components, plastic/resin/wax insulators, etc., can solve the problems of limited use, high brittleness, poor low-temperature impact performance, etc., to improve impact performance, easy recycling, Good electrical performance

Active Publication Date: 2019-11-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, isotactic polypropylene is very brittle and has poor low-temperature impact properties, which limit its use in high-voltage DC cables.

Method used

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  • Polypropylene-based high-voltage direct-current cable material and preparation method thereof
  • Polypropylene-based high-voltage direct-current cable material and preparation method thereof
  • Polypropylene-based high-voltage direct-current cable material and preparation method thereof

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preparation example Construction

[0031] The preparation method of the polypropylene-based high-voltage DC cable material of the present invention, in order to ensure that the nucleating agent is uniformly and stably dispersed in the polypropylene, adopts the masterbatch method and the step-by-step formula to prepare the finished material, specifically comprising the following steps:

[0032] 1) Preparation of polypropylene masterbatch containing β-nucleating agent: add isotactic polypropylene (iPP) and nucleating agent in proportion to the micro-twin-screw mixer for melt blending, and set the temperature of each zone of the screw to (195 ~ between 200°C), feed port speed (8-12rpm), screw speed (150-200rpm), after twin-screw mixing and extrusion to obtain a polypropylene masterbatch containing 5% 10% beta nucleating agent.

[0033] 2) Preparation of semi-finished materials: Add polypropylene masterbatch and polypropylene containing 5% to 10% β-nucleating agent in proportion to melt blending in a micro-twin-scre...

Embodiment 1

[0042] Example 1: In terms of parts by mass, 70 parts of ethylene-propylene block copolymerized polypropylene, 30 parts of isotactic polypropylene, and 300 parts of antioxidant were added.

Embodiment 2

[0043] Embodiment 2: In terms of parts by mass, 60 parts of ethylene-propylene block copolymerized polypropylenes, 40 parts of isotactic polypropylenes, 0.12 parts of rare earth nucleating agents, and addition of antioxidant 1010 (tetra[beta-(3,5 -di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester), antioxidant 168 (tris(2.4-di-tert-butylphenyl) phosphite), antioxidant 300 (4,4'- Thiobis(6-tert-butyl-3-methylphenol)) were 0.1, 0.2, 0.1 parts respectively.

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Abstract

The invention relates to a polypropylene-based high-voltage direct-current cable material and a preparation method thereof. The polypropylene-based high-voltage direct-current cable material comprisesthe following components in parts by mass: 10-50 parts of beta nucleating agent-containing isotactic polypropylene, 50-90 parts of ethylene propylene block co-polypropylene and 0.1-0.5 part of an antioxidant, wherein the sum of the mass parts of the beta nucleating agent-containing isotactic polypropylene and the ethylene propylene block co-polypropylene is 100 parts, and the mass percentage of the beta nucleating agent in the beta nucleating agent-containing isotactic polypropylene is 0.3-1%. According to the invention, the method of adding the beta nucleating agent and the isotactic polypropylene for carrying out mixing with the block polypropylene to prepare the beta crystal-containing blended polypropylene material, and the problems of large brittleness and poor low-temperature impactof isotactic polypropylene, and low dielectric breakdown strength of ethylene propylene block co-polypropylene (EPC) are solved by blending of the EPC and the beta nucleating agent-containing isotactic polypropylene (beta-iPP). The invention provides the polypropylene-based direct-current high-voltage cable material which is green and recyclable, has excellent mechanical and electrical properties, and can replace cross-linked polyethylene (XLPE).

Description

technical field [0001] The invention relates to the field of thermoplastic DC cable materials, in particular to a polypropylene-based high-voltage DC cable material and a preparation method thereof. Background technique [0002] XLPE has excellent mechanical and electrical properties and is the main insulating material for extruded plastic cables. However, due to the by-products of the cross-linking process, it has a greater impact on the space charge accumulation of the DC cable. The accumulation of space charges will cause distortion of the electric field inside the cable insulation, which will lead to partial discharge and breakdown of the cable insulation, and reduce the insulation performance of the material. In addition, cross-linked polyethylene is a thermosetting material. After the cable is decommissioned, it cannot be degraded and recycled. It can only be disposed of by incineration and landfill, which causes great pollution to the environment. Therefore, there i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L53/00C08L23/12C08K5/00C08K5/20C08K5/375C08K5/134C08K5/526H01B3/44
CPCC08K2201/014C08L53/00C08L2203/202C08L2205/242H01B3/441C08L23/12C08K5/00C08K5/0083C08K5/20C08K5/1345C08K5/526C08K5/375
Inventor 黄凯文徐曼薛志刚张伟谢大荣
Owner XI AN JIAOTONG UNIV
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