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Compositions and methods for preparing crosslinked polyolefins using peroxide initiators

A composition, interpolymer technology, applied in bendable conductors, bendable cables, plastic/resin/wax insulators, etc., which can solve problems such as slow curing rate and scorch

Active Publication Date: 2021-06-11
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, achieving a suitable balance of cure rate at the disclosed cure temperature of 175°C to 260°C and scorch retardation at 140°C has been problematic, with either the cure rate being significantly faster than existing peroxide initiated systems. slower or significantly more prone to scorching

Method used

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  • Compositions and methods for preparing crosslinked polyolefins using peroxide initiators
  • Compositions and methods for preparing crosslinked polyolefins using peroxide initiators
  • Compositions and methods for preparing crosslinked polyolefins using peroxide initiators

Examples

Experimental program
Comparison scheme
Effect test

example

[0102] Material

[0103] In the examples detailed below, the following materials were used:

[0104] Table 1: Materials

[0105]

[0106] study 1

[0107] The following study was performed to evaluate the curing of samples using a conventional peroxide-initiated crosslinking reaction versus a hybrid curing system via peroxide and epoxy / anhydride-initiated crosslinking reactions according to the present invention.

[0108] Sample Preparation

[0109] Use DSM Twin-screw microcompounder Polymer blends were prepared according to the formulations provided in Table 2 below. The microcompounder was started with a rotor speed of 30 rpm at a set point of 220°C. A pre-weighed amount of component "A" anhydride-functionalized PE terpolymer (LOTADER TM 3210) in N 2 Add under purge to the rotating mixing rotor of the microcompounder. After heating at 220°C for 30 minutes, the Component "A" terpolymer material was cooled to 115°C. Subsequently, component "B" epoxy-function...

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PUM

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Abstract

Crosslinkable interpolymer blends comprising vinyl monomer residues, residues of comonomers having carboxylic acid and / or carboxylic anhydride functionality, and residues of comonomers having epoxy functionality, peroxide initiated agent and optionally a crosslinking catalyst, in an embodiment, the crosslinkable interpolymer blend cures to a gel content greater than (>) 50 wt% in less than 1.5 minutes at 200°C, and at Little or no degassing is required after crosslinking.

Description

technical field [0001] Embodiments of the present invention relate to interpolymer blends that are crosslinked using a hybrid cure system comprising peroxide and epoxy / anhydride initiated crosslinking reactions and are suitable for use in wire and cable Applied insulating material. Background technique [0002] Medium voltage ("MV"), high voltage ("HV") and extra high voltage ("EHV") cables typically contain oxide cross-linked polyethylene material as insulation. The current process for cable manufacture involves treating peroxide-imbibed low-density polyethylene ( LDPE) onto a suitable conductor. Subsequently, the cable core is conveyed through a vulcanization unit at a high temperature of about 200°C on average, causing cross-linking of the LDPE insulation within a few minutes. After cooling, the cable core is wound up on a spool for subsequent processing. [0003] Although crosslinking provides valuable improvements in the thermomechanical properties of the material, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08K5/14H01B7/04
CPCH01B3/40H01B3/441H01B3/447C08L23/0869C08L2203/202C08L2312/00C08F299/00C08L23/0884C08K5/14C08L51/06C08G81/021C08F210/02C08F220/06C08F222/06
Inventor 任大凯K·M·高T·H·彼得森T·N·辛格-拉什福德M·A·里卡德J·M·柯吉恩孙亚斌
Owner DOW GLOBAL TECH LLC