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Ethylene polymer, composition containing the ethylene polymer, application thereof, and a pipeline

A technology of ethylene polymer and composition, which is applied in the direction of pipes, rigid pipes, pipes/pipe joints/pipe fittings, etc. It can solve the problems of uneven welding wall thickness, low melt viscosity, and fusion welding is not suitable for pipes, and achieve high Effect of hydrostatic stress cracking resistance and high productivity

Active Publication Date: 2016-08-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] During the actual application, it was found that the ethylene polymer prepared by single active site catalyst had a low melt viscosity when extruded into a pipe with a large diameter, and it was prone to sagging during the extrusion process, and was hot melted during or after molding. During welding, sagging will cause uneven welding wall thickness
Therefore, ethylene polymers prepared by single-site catalysts (such as metallocene catalysts) can only be used to form small-diameter pipes (such as pipes with a diameter below 32mm), and the pipes are not suitable for fusion welding.

Method used

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  • Ethylene polymer, composition containing the ethylene polymer, application thereof, and a pipeline
  • Ethylene polymer, composition containing the ethylene polymer, application thereof, and a pipeline
  • Ethylene polymer, composition containing the ethylene polymer, application thereof, and a pipeline

Examples

Experimental program
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Effect test

Embodiment 1

[0088] (1) Polymerize in two polymerization stirred tanks connected in series to prepare ethylene polymer, the specific steps are as follows.

[0089] Continuously add ethylene, n-hexane, Ziegler-Natta catalyst (the catalyst is prepared by the method described in Example 1 of CN1523044A), triethylaluminum and hydrogen into the first polymerization stirred tank of 500 liters, listed in Table 1 Polymerization was carried out for 2 hours under the above conditions.

[0090] The slurry from the first polymerization stirred tank is continuously transferred to the flash tank to remove unreacted hydrogen, unreacted ethylene and part of hexane, and the remaining polymer slurry is continuously transferred to the second polymerization stirred tank. At the same time, ethylene, 1-butene, n-hexane and hydrogen were added to the second polymerization stirred tank, and polymerization was carried out under the conditions given in Table 1.

[0091] The polymer slurry output from the second po...

Embodiment 2

[0095] (1) The ethylene polymer was prepared by the same method as in Example 1, except that 1-butene was added to both the first polymerization stirred tank and the second polymerization stirred tank, so as to obtain the ethylene polymer according to the present invention. The properties of the ethylene polymers are listed in Table 2.

[0096] (2) The composition was prepared by the same method as in Example 1, except that the ethylene polymer was the ethylene polymer prepared in step (1) of Example 2.

[0097] (3) Extrude the composition obtained in step (2) under the conditions listed in Table 2, so as to obtain the pipe according to the present invention. The hydrostatic stress failure times of the pipes are listed in Table 2.

Embodiment 3

[0099] (1) The ethylene polymer was prepared by the same method as in Example 1, except that the polymerization conditions were as shown in Table 1, so as to obtain the ethylene polymer according to the present invention. The properties of the ethylene polymers are listed in Table 2.

[0100] (2) The composition was prepared by the same method as in Example 1, except that the ethylene polymer was the ethylene polymer prepared in step (1) of Example 3.

[0101] (3) Extrude the composition obtained in step (2) under the conditions listed in Table 2, so as to obtain the pipe according to the present invention. The hydrostatic stress failure times of the pipes are listed in Table 2.

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Abstract

The invention provides an ethene polymer and applications thereof. Total weight of the ethene polymer is taken as a base, the ethene polymer contains monomeric units formed from ethene, and monomeric units formed form alpha-alkenes containing 4 to 10 carbon atoms. Molecular weight bimodal distribution of the ethene polymer is shown by results of gel permeation chromatography testing; weight average molecular weight of low molecular weight ingredients ranges from 5000 to 50000Da, weight average molecular weight of high molecular weight ingredients ranges from 50000 to 3000000; and separation degree DOS of the low molecular weight ingredients to the high molecular weight ingredients ranges from 0.28 to 0.52. The invention also provides a composition containing the ethene polymer, and applications thereof. The invention provides a pipeline prepared from the composition. The pipeline is prepared via extrusion of the ethene polymer, extrusion can be carried out at a relatively high speed, and the pipeline possesses relatively high hydrostatic stress rupture resistance.

Description

technical field [0001] The invention relates to an ethylene polymer. The invention also relates to a composition containing the ethylene polymer and its application. The invention further relates to a pipe prepared from the composition. Background technique [0002] The ethylene polymer mainly composed of ethylene monomer units obtained by the copolymerization of ethylene and α-olefin has the characteristics of light weight, corrosion resistance, good rigidity and toughness balance, easy molding and economical, etc., and is an ideal material for pipes and pipes. Pipes made of ethylene polymers are widely used in pressure or non-pressure pipe fields such as industry, agriculture, and daily life due to their excellent comprehensive performance and economy. At present, typical products of pipes made of ethylene polymers include PE63, PE80 and PE100 grades of non-pressure or pressure pipes and the like. However, the service temperature of the above-mentioned pipes or pipes is g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/16C08L23/08F16L9/12B29C47/92B29C48/92
CPCB29C48/92B29C2948/92266B29C2948/926
Inventor 赵丽梅王力刚景政红陈钶王彦荣谷凤来何震海李大伟万小侠
Owner CHINA PETROLEUM & CHEM CORP
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