Preparation method of high density polyethylene communication cable insulating material

A high-density polyethylene and communication cable technology, applied in the direction of organic insulators, plastic/resin/wax insulators, etc., can solve the problems of high catalyst costs, product performance limitations, and difficult development, etc., to improve processing performance and processing fluidity The effect of improvement, uniformity and overall performance improvement

Inactive Publication Date: 2007-01-31
SINOPEC YANGZI PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The single reactor method can reduce the investment cost, but the catalyst cost is high, the development is difficult, and the product performance will be limited to a certain extent

Method used

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  • Preparation method of high density polyethylene communication cable insulating material
  • Preparation method of high density polyethylene communication cable insulating material
  • Preparation method of high density polyethylene communication cable insulating material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0040] According to the manufacturing method of bimodal high-density polyethylene communication cable insulating material involved in the present invention, on the high-density polyethylene device of Mitsui process, under the action of Ziegler-Natta catalyst (titanium trichloride and aluminum alkyl), bimodal The slurry polymerization tanks are connected in series to carry out the polymerization reaction. Add catalyst in the first reactor, and only add ethylene hydrogen without adding comonomer butene-1, react for 2 hours, the polymer produced is low molecular weight polyethylene homopolymer; no catalyst is added in the second reactor , and adding ethylene, hydrogen and comonomer butene-1, so that the comonomer butene-1 is polymerized to the high molecular weight polyethylene molecular chain in the product, and reacted for 2 hours, and the polymer produced is a high molecular weight polyethylene copolymer. The specific production process control parameters of the two reactors a...

Embodiment 2

[0050] According to the present invention, changing the hydrogen addition amount of the first reactor and the second reactor, that is, changing the hydrogen / ethylene ratio of the first reactor and the second reactor, can control the polymerization of the first reactor and the second reactor The molecular weight of the product can be used to produce bimodal polyethylene products with different molecular weights and distributions. By changing the amount of butene added in the second reactor, that is, by changing the comonomer content in the second reactor, bimodal high-density polyethylene products with different environmental stress cracking resistance can be produced.

[0051] In Example 2, by changing the process control parameters in Example 1, especially the hydrogen / ethylene ratio and the flow rate of butene-1, bimodal high-density polymers with different molecular weights and their distributions and different environmental stress cracking resistance properties can be obtai...

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Abstract

The present invention relates to a preparation method of double-peak high-density polyethylene communication cable insulating material. It is characterized by that on the Mitsui chemical high-density polyethylene technological equipment a double-slurry polymerization reactors series-connected reaction process can be adopted. Said invention is an improvement of existent technological process, namely, the catalyst only is added into the first reactor, and in the first reactor the comonomer butylene-1 is not added, the added quantity of hydrogen is controlled, the molecular weight distribution and density of polymer produced by two reactors can be regulated so as to make first reactor polymer be low molecular weight high-density polyethylene, the second reactor polymer be high molecular weight high-density polyethylene so as to obtain polymer-grade polyethylene whose molecular weight is formed into double-peak distribution. After the adjuvant is added into the above-mentioned material and granulated, the communication cable insulating material product can be made up by utilizing large equipment.

Description

[0001] The invention relates to a preparation method of a high-density polyethylene communication cable insulation material, in particular to a production method of a bimodal high-density polyethylene communication cable insulation material. Background technique [0002] As a high-density polyethylene communication cable insulation material, it is not only required to have good electrical properties, mechanical properties, heat resistance, wear resistance, and environmental resistance, but also to meet the requirements of demanding high-speed processing performance. There are two main methods of manufacturing high-density polyethylene communication cable insulating materials: one is to directly polymerize resin production equipment to produce special materials, and the other is to mix several kinds of resins. At present, the products supporting the domestic high-grade insulating material market are the blended high-density polyethylene communication cable insulating material DG...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02H01B3/44
Inventor 陆小义黎地殷大斌徐振明张勇柏基业朱柯周正亚
Owner SINOPEC YANGZI PETROCHEM
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