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Polypropylene resin for electric wire insulation

A resin, propylene technology, used in insulators, insulated cables, insulated conductors, etc., can solve the problems of reduced powder production stability, local physical property deterioration, unevenness, etc., to achieve excellent windability, excellent production stability, excellent performance effect

Active Publication Date: 2020-09-04
HANWHA TOTAL ENERGIES PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in order to solve the problem of reduced windability due to the high rigidity of polypropylene, it is necessary to additionally knead rubber (rubber), so there is a possibility that local physical property deterioration due to uneven kneading may occur. In addition, for The addition of organic nucleating agents to reduce the crystal size increases the cost and the resulting defects, so this needs to be improved for the use of polypropylene in the insulation layer of power cables
[0006] In addition, the product usually named RTPO (reactor made thermoplastic olefin) in polypropylene has excellent windability due to the high content of rubber polymerized in the reactor, but with As the rubber content increases, the viscosity of the powder in the polymerization step will lead to a decrease in production stability, making it difficult to achieve stable continuous production, so it needs to be improved

Method used

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  • Polypropylene resin for electric wire insulation
  • Polypropylene resin for electric wire insulation
  • Polypropylene resin for electric wire insulation

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preparation example Construction

[0036] The preparation method of the ethylene-propylene block copolymer of the present invention is not particularly limited, and the preparation method of the ethylene-propylene block copolymer known in the technical field of the present invention can be directly used, or used after being appropriately modified.

[0037] Preferably, the Hypol process of Mitsui Corporation, which enables continuous polymerization by connecting 2 bulk reactors and 2 gas phase reactors in series, can be used to prepare ethylene according to polymerization methods known to those skilled in the art - Propylene block copolymers.

[0038] Specifically, in the first-stage to third-stage reactors, a propylene homopolymer may be prepared by feeding propylene alone, or an ethylene-propylene random copolymer may be prepared by additionally feeding ethylene. In the polymerization reaction of the ethylene-propylene random copolymer, an equal amount of ethylene can be copolymerized in each polymerization re...

Embodiment 1 to Embodiment 4

[0055] In a glass reactor equipped with a 1-liter stirrer fully replaced by nitrogen, add 112 ml of toluene and 15 g of diethoxymagnesium (spherical with an average particle size of 20 μm, a particle size distribution index of 0.86, and an apparent density of 0.35g / ml), and maintained at a temperature of 10°C, dilute 20ml of titanium tetrachloride in 30ml of toluene and add it to the reactor for 1 hour, then raise the temperature of the reactor to 100°C, and add A mixture of 3.6 g diisobutyl phthalate, 1.4 g methyl 4-methoxybutyrate. After keeping at 100° C. for 2 hours, lower the temperature to 90° C., stop stirring, remove the supernatant, and then wash once with 200 ml of toluene. 120 ml of toluene and 20 ml of titanium tetrachloride were added thereto, the temperature was raised to 100° C. and maintained for 2 hours, and this process was repeated once. After the aging process, the slurry mixture was washed twice with 200 ml of toluene each time, and washed five times with...

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Abstract

The present invention relates to an ethylene-propylene block copolymer resin which is suitable for an insulation layer of a power cable because of the excellent properties of flexibility, heat distortion, and brittleness temperature and good dielectric breakdown strength, and which exhibits production stability upon polymerization because of excellent fluidity of polypropylene powder in spite of high content of a rubber polymer. More particularly, the ethylene-propylene block copolymer resin according to an embodiment of the present invention is prepared as a propylene homopolymer or an ethylene-propylene random copolymer is stepwise polymerized, in a reactor, with an ethylene-propylene rubber copolymer in the presence of a Ziegler-Natta catalyst that is obtained using two kinds of internal electron donors, wherein one of the two kinds of internal electron donors is a compound comprising an ester group and an alkoxy group, the ethylene-propylene random copolymer has a melting point of150-160DEG C, and contains 30-50 wt% of a solvent extract extracted with xylene at room temperature, the solvent extract having an intrinsic viscosity of 1.5-3.0 dl / g.

Description

technical field [0001] The present invention relates to a polypropylene resin suitable for insulation of power cables. More specifically, the present invention relates to a non-crosslinked polypropylene resin which has excellent mechanical properties and can be recycled, and relates to a non-crosslinked polypropylene resin which has excellent windability, heat deformation, cold impact resistance, good insulation breakdown strength, Therefore, it is suitable as an ethylene-propylene block copolymer resin for an insulating layer of a power cable. Although the ethylene-propylene block copolymer resin according to the present invention contains a high content of rubber polymer, it has excellent production stability when performing polymerization due to excellent fluidity of polypropylene powder. Background technique [0002] As the insulating layer material of general power cables, polyethylene, ethylene-propylene rubber copolymer (ethylene-propylene rubber; EPR), ethylene-prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F297/08C08F4/654C08F4/645C08F4/649C08F4/646C08F4/659H01B3/44H01B7/02C08L53/00
CPCH01B3/441C08F210/06C08F2/001C08F2/02C08F2/34C08F4/651C08F210/16C08F2500/12C08F2500/17C08F2500/30C08F2500/34C08F4/6541C08F4/6465H01B7/02C08F4/6455C08F4/6494C08F4/6546C08F4/65912C08F297/083C08L53/00C07C69/708
Inventor 金奉奭李泳周崔永旭全龙成
Owner HANWHA TOTAL ENERGIES PETROCHEMICAL CO LTD
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