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Polyethylene having high degree of cross-linking, and cross-linked polyethylene pipe comprising same

A polyethylene, density technology, applied in the direction of pipes, rigid pipes, pipes/pipe joints/pipe fittings, etc., can solve the problem of reduced cross-linking degree

Active Publication Date: 2021-09-07
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the degree of crosslinking decreases

Method used

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  • Polyethylene having high degree of cross-linking, and cross-linked polyethylene pipe comprising same
  • Polyethylene having high degree of cross-linking, and cross-linked polyethylene pipe comprising same
  • Polyethylene having high degree of cross-linking, and cross-linked polyethylene pipe comprising same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0157] 1-1 Preparation of Ligand Compounds

[0158] Dissolve 2.9 g (7.4 mmol) of 8-methyl-5-(2-(trifluoromethyl)benzyl)-5,10-dihydroindeno[1,2-b]indole in 100 mL of hexane Alkanes and 2 mL (16.8 mmol) of MTBE (methyl tert-butyl ether), and in a dry ice / acetone bath, 3.2 mL (8.1 mmol) of 2.5 M n-BuLi hexane solution was added dropwise, and then the mixture was stirred at room temperature overnight. In another 250 mL Schlenk flask, 2 g (7.4 mmol) of (6-tert-butoxyhexyl)dichloro(methyl)silane was dissolved in 50 mL of hexane, which was then added dropwise in a dry ice / acetone bath, and A lithiated slurry of 8-methyl-5-(2-(trifluoromethyl)benzyl)-5,10-dihydroindeno[1,2-b]indole was added dropwise via cannula. After the injection was complete, the mixture was slowly warmed to room temperature and then stirred overnight at room temperature. Meanwhile, 1.2 g (7.4 mmol) of fluorene was also dissolved in 100 mL of THF, and in a dry ice / acetone bath, 3.2 mL (8.1 mmol) of 2.5 M n-Bu...

preparation Embodiment 1

[0176] 5.0 kg of toluene solution was added into a 20 L autoclave, and the temperature of the reactor was kept at 40 °C. 1000 g of silica (manufactured by Grace Davison, SP 948) was dehydrated by applying a vacuum at a temperature of 600° C. for 12 hours, and then added to the reactor to sufficiently disperse the silica. Then 495 g of the first metallocene compound of Synthesis Example 1 was dissolved in toluene, and then added thereto. The mixture was reacted at 40° C. for 2 hours while stirring at 200 rpm. Stirring was then stopped, and the reaction solution was left to stand for 30 minutes and decanted.

[0177] 2.5 kg of toluene was charged into the reactor, 9.4 kg of a 10% by weight methylaluminoxane (MAO) / toluene solution was added thereto, and the mixture was stirred at 200 rpm at 40° C. for 12 hours. After the reaction, stirring was stopped, and the reaction solution was left to stand for 30 minutes and decanted. 3.0 kg of toluene was added thereto and stirred for 1...

preparation Embodiment 2

[0182] A hybrid supported catalyst was prepared in the same manner as in Preparation Example 1, except that 476 g of the first metallocene compound of Synthesis Example 1 was added, and 34 g of the second metallocene compound of Synthesis Example 2 was added. In the prepared hybrid supported catalyst, the molar ratio between the first metallocene compound and the second metallocene compound was 8:1.

[0183]

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Abstract

The present invention relates to polyethylene having a high degree of cross-linking, and a cross-linked polyethylene pipe comprising the same. The polyethylene according to the present invention has an ultra-high molecular weight so as to have increased cross-linking speed, thereby exhibiting a sufficient degree of cross-linking even when cross-linking time is short, and thus exhibiting the excellent strength and pressure resistance.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2019-0020025 filed on February 20, 2019 and Korean Patent Application No. 10-2020-0020644 filed on February 19, 2020 with the Korean Intellectual Property Office, which The disclosure of the application is incorporated herein by reference in its entirety. [0003] The present disclosure relates to polyethylene with a high degree of crosslinking and a crosslinked polyethylene pipe comprising the polyethylene. Background technique [0004] Cross-linked polyethylene was developed by electric wire companies in 1960 to improve temperature characteristics due to heat generation of electric wires, and Thomas Engel of Germany produced pipes with excellent durability using this polyethylene in 1967. [0005] Cross-linked polyethylene is modified into polyethylene with a three-dimensional network structure by cross-linking high-density poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F2/38C08F4/6592C08F4/659C08F4/646C08L23/06C08K5/14C08K5/00F16L9/12
CPCC08K5/14F16L9/12C08F110/02C08F4/65916C08F2420/07C08F2420/06C08F4/65904C08F4/65925C08F2/14C08F2500/04C08F2500/12C08L23/06C08F10/02C08F2/38C08F4/65927C08F4/6465C08K5/0025C08L2203/18
Inventor 曹柗李玹燮金善美崔二永李明汉金娟洙
Owner LG CHEM LTD
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