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Preparation method of high density polyethylene pipe material

A high-density polyethylene and polyethylene resin technology, which is applied in the field of preparation of bimodal molecular weight distribution polyethylene, can solve the problems of insufficient processing performance and poor long-term creep resistance, and achieve high mechanical strength and excellent resistance to environmental stress cracking performance effect

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

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to use the slurry polymerization process, adopt ordinary Ziegler-Natta catalyst, double reactors in series, and develop a High-performance high-density polyethylene pipe material, the molecular weight of the resin has a bimodal distribution, which makes the material not only have excellent mechanical properties, but also has good processing performance, which has changed the poor long-term creep resistance of traditional materials and overcomes the single-peak structural pipe Disadvantages of insufficient material processing performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add the catalyst BCH and solvent hexane into the first reactor, the amount of ethylene added is 4000kg / h, the hydrogen / ethylene volume ratio is controlled to 4.0, the reaction temperature is 85°C, the reaction pressure is 0.55MPa, and the polymer melt flow rate is controlled to 500g / 10min; Then enter the second reactor, the amount of ethylene added is 5000kg / h, the hydrogen / ethylene volume ratio is controlled to 0.04, the comonomer butene-1 is added, the added amount is 50kg / h, the reaction temperature is 78°C, the reaction pressure is 0.23MPa, and the polymerization is controlled The melt flow rate of the product reaches 0.03g / 10min, and the polyethylene resin is obtained from the discharge, and the product density is 0.954g / cm 3 .

Embodiment 2

[0015] Example 2: Add catalyst BCH and solvent hexane to the first reactor, add ethylene to 4200kg / h, control hydrogen / ethylene volume ratio to 5.0, react at 85°C, react at 0.55MPa, and control polymer melt flow rate to 600g / 10min; then enter the second reactor, the amount of ethylene added is 5800kg / h, the hydrogen / ethylene volume ratio is controlled to 0.04, the comonomer butene-1 is added, the amount is 70kg / h, the reaction temperature is 78°C, and the reaction pressure is 0.23 MPa, the polymer melt flow rate is controlled to 0.04g / 10min, and polyethylene resin is obtained from the discharge, and the product density is 0.953g / cm 3 .

Embodiment 3

[0016] Example 3: Add catalyst PZ and solvent hexane to the first reactor, add ethylene to 5200kg / h, control hydrogen / ethylene volume ratio to 5.4, react at 85°C, react at 0.55MPa, and control polymer melt flow rate to 700g / 10min; then enter the second reactor, the ethylene addition is 4800kg / h, the hydrogen / ethylene volume ratio is controlled to 0.05, the comonomer butene-1 is added, the addition is 70kg / h, the reaction temperature is 78°C, and the reaction pressure is 0.23 MPa, the polymer melt flow rate is controlled to 0.05g / 10min, and polyethylene resin is obtained from the discharge, and the product density is 0.953g / cm 3 .

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Abstract

The present invention relates to a preparation method of high-density polyethylene pipe material. It is characterized by that two reactors are series-connected, under the condition of polymerization the ethylene is contacted with alpha-olefin copolymer monomer containing at least 3-6 carbon atoms and catalyst. In first reactor the added quantity of ethylene is 40%-60% of total added quantity of ethylene of two reactors, and the volume ratio of hydrogen gas and ethylene is 3.0-15.0; in second reactor the added quantity of ethylene is 40%-60% of total added quantity of ethylene of two reactors, and the volume ratio of hydrogen gas and ethylene is 0.02-0.20, and the added quantity of copolymer monomer is 0.5%-2.5% of total added quantity of ethylene of two reactors.

Description

technical field [0001] The invention relates to a method for preparing bimodal molecular weight distribution polyethylene. Background technique [0002] Bimodal molecular weight distribution polyethylene has both good physical and mechanical properties and good processability, especially good extrudability. Suitable as a material of choice for polyethylene pipes. [0003] Chinese patent CN1035298 realizes the molecular structure of the product as a bimodal distribution by developing a specific catalyst, and uses a mixed catalyst system of two-component or multi-component catalysts in a single reactor to produce bimodal distribution of polyethylene; Chinese patent CN95195179.3 It relates to the production of broad / bimodal molecular weight distribution polyethylene resins by specific catalysts in a single reactor, which is a fluidized bed reactor, and the molecular weight is adjusted by adding a catalyst regulator in the reactor; Chinese Patent No. CN200510078197.1 also rela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/16
Inventor 姚小利徐振明傅勇姚斌鲍光复姜志荣
Owner SINOPEC YANGZI PETROCHEM
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