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A kind of modified polypropylene material for composite insulator

A technology for polypropylene materials and composite insulators, which is applied in the field of composite insulator sheds and sheaths, and modified polypropylene materials for composite insulators. The elongation rate is not large, and the appearance is intact, and the effect of high and low temperature resistance is excellent.

Active Publication Date: 2022-08-02
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing polypropylene modification technology has the following disadvantages: due to the low high-temperature tensile strength of copolymerized polypropylene, the ethylene-octene copolymer toughening agent added is controlled at 20 parts or less, and the fracture at -40°C The elongation rate is not large. If the amount of toughening agent used continues to be increased, the high temperature tensile strength will be further sacrificed; on the other hand, due to the poor compatibility of homopolypropylene with ethylene-octene copolymer toughening Tougheners have poor effect on elongation at break at low temperature
The existing technology of modified polypropylene materials cannot meet the requirements of high temperature tensile strength and low temperature elongation at break for shed and sheath materials of composite insulators

Method used

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  • A kind of modified polypropylene material for composite insulator
  • A kind of modified polypropylene material for composite insulator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A modified polypropylene material resistant to high and low temperature stretching, comprising the following components in parts by weight: 52 parts of a homopolymeric polypropylene resin, 48 parts of a toughening agent, 0.1 part of a nucleating agent, 20 parts of a flame retardant, Antioxidant 0.2 part, light stabilizer 0.3 part. The toughening agent is composed of copolymerized polypropylene resin, ethylene-propylene rubber grafted polypropylene resin and POE in a ratio of 1:0.44:1.56, namely 16 parts of copolymerized polypropylene resin and 7 parts of ethylene-propylene rubber grafted polypropylene resin. and POE25.

[0016] The above materials are fully mixed and stirred at room temperature for 5 minutes, extruded with twin screws (180-200° C.), water-cooled, and dried with hot air for granulation. Injection molding process control: pressure 7.5MPa, injection temperature 220℃, mold temperature 20℃, 110kV rod type composite insulator made of this modified polypropyl...

Embodiment 2

[0018] A modified polypropylene material resistant to high and low temperature stretching, comprising the following components in parts by weight: 60 parts of a homopolymeric polypropylene resin, 40 parts of a toughening agent, 0.1 part of a nucleating agent, 20 parts of a flame retardant, Antioxidant 0.2 part, light stabilizer 0.3 part. The toughening agent is composed of copolymerized polypropylene resin, ethylene-propylene rubber grafted polypropylene resin and POE in a ratio of 1:0.5:2.5, namely 10 parts of copolymerized polypropylene resin and 5 parts of ethylene-propylene rubber grafted polypropylene resin. and POE25.

[0019] The above materials are fully mixed and stirred at room temperature for 5 minutes, extruded with twin screws (180-200° C.), water-cooled, and dried with hot air for granulation. Injection molding process control: pressure 7.5MPa, injection temperature 220℃, mold temperature 20℃, 110kV rod type composite insulator made of this modified polypropylen...

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Abstract

A modified polypropylene material for a composite insulator, comprising the following components in parts by weight: 50-70 parts of a homopolymeric polypropylene resin, 30-50 parts of a toughening agent, 0.05-0.3 parts of a nucleating agent, and a flame retardant 10-30 parts, antioxidant 0.2-0.5 part, light stabilizer 0.2-0.5 part. Further, the toughening agent is composed of copolymerized polypropylene resin, ethylene-propylene rubber grafted polypropylene resin and ethylene-octene copolymer in a weight ratio of 1:0.3-0.6:1.5-3. The modified polypropylene material of the present invention has high tensile strength at high temperature and elongation at low temperature at the same time, thereby making a composite insulator of shed and sheath, and has excellent high and low temperature resistance: hot water at +70°C (placed for 12 hours) and ‑40℃ air (12 hours) high and low temperature cycle test 12 times, the appearance of the insulator shed and sheath is intact, and there is no cracking or detachment.

Description

technical field [0001] The invention relates to a modified polypropylene material for composite insulators, which is used for composite insulator sheds and sheaths, and belongs to the technical field of insulators. Background technique [0002] Composite insulators on transmission lines are composed of epoxy mandrels, polymer sheds and sheaths, and end fittings. They have the advantages of excellent electrical properties, hydrophobicity, mechanical strength, light weight, and convenient transportation and installation. In order to increase the properties such as creepage distance and lightning shock resistance, composite insulators are usually designed as long rods. In addition to basic requirements such as combustion and insulation, the polymer must have high and low temperature tensile properties, that is, high high temperature tensile strength and low temperature elongation at break at the same time, to adapt to various temperature differences such as high altitude, deser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L23/14C08L51/06C08L23/08
Inventor 全一武严姗芝汪开瑞陈强高嵩
Owner NANJING UNIV