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Polyethylene resin for tubular material and preparation method and composition thereof

A technology of polyethylene resin and composition, which is applied in the field of polyethylene resin and its preparation method and its composition, can solve the problems of complex process and high cost, and achieve the effect of high hydrostatic strength and excellent resistance to slow crack growth

Active Publication Date: 2009-05-06
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

EP0881237 discloses the use of metallocene catalysts to produce bimodal polyolefins in two reactors. The above-mentioned several processes can obtain polyethylene resins with bimodal molecular weight distribution, but the cost is high and the process is complicated

Method used

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  • Polyethylene resin for tubular material and preparation method and composition thereof
  • Polyethylene resin for tubular material and preparation method and composition thereof
  • Polyethylene resin for tubular material and preparation method and composition thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Using the Unipol gas-phase polyethylene process, ethylene, hydrogen and comonomers are introduced into the gas-phase fluidized bed reactor, and the polyethylene resin is reacted under the action of a catalyst. The catalyst is bistriphenylsilane chromate supported on silica gel. Aluminum / chromium=6.0:1.

[0043] See Table 1 for production conditions and Table 2 for resin properties.

[0044] After the polyethylene resin is prepared into a ф32×3mm pipe, according to the provisions of ISO / TR 9080, the statistical result σ of the expected hydrostatic strength when extrapolated to 20°C and subjected to water pressure for 50 years LPL The value is 10.261MPa. Extrapolation results are attached figure 1 .

Embodiment 2

[0046] Using the Unipol gas-phase polyethylene process, ethylene, hydrogen and comonomers are introduced into the gas-phase fluidized bed reactor, and the polyethylene resin is reacted under the action of a catalyst. The catalyst is bistriphenylsilane chromate supported on silica gel. Aluminum / chromium=5.0:1.

[0047] See Table 1 for production conditions and Table 2 for resin properties.

[0048] After the polyethylene resin is prepared into a ф32×3mm pipe, according to the provisions of ISO / TR 9080, the statistical result σ of the expected hydrostatic strength when extrapolated to 20°C and subjected to water pressure for 50 years LPL The value is 10.182MPa.

Embodiment 3

[0050] Using the Unipol gas-phase polyethylene process, ethylene, hydrogen and comonomers are introduced into the gas-phase fluidized bed reactor, and the polyethylene resin is reacted under the action of a catalyst. The catalyst is bistriphenylsilane chromate supported on silica gel. Aluminum / chromium=5.5:1.

[0051] See Table 1 for production conditions and Table 2 for resin properties.

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Abstract

The invention discloses a polythene resin for tubing, a preparation method and a composition thereof. The mass flow rate of a polythene resin fusant is between 0.25 and 1.0 g / min; the density of the polythene resin fusant is between 0.930 and 0.955g / cm< 3 >; molecular weight of the polythene resin fusant is in unimodal distribution; the ratio of Mw to Mn is between 20 and 90; a comonomer is butylethylene; the branching degree is between 20 and 80 / 10,000C; and 6 LPL is more than or equal to 10.00MPa. The resin is produced through adopting a Unipol gas phase polythene process. The polythene resin composition for the tubing comprises the following compositions in weight portion: 100 portions of the polythene resin. 0.1 to 0.5 portion of antioxidant and 0 to 5 portions of pigment. The polythene resin and the polythene resin composition have high long-term hydrostatic strength and excellent capability for resisting slow crack expansion and rapid crack expansion.

Description

technical field [0001] The invention relates to a polyethylene resin, a preparation method and a composition thereof. More specifically, the invention relates to a polyethylene resin for pressure pipes, a preparation method and a composition thereof. Background technique [0002] Polyethylene pipes are more and more widely used in gas transportation due to their outstanding chemical corrosion resistance, low temperature resistance, heat resistance, wear resistance and welding performance, no pollution to the transmission medium, low manufacturing and installation costs, and long service life. , water supply, sewage, heat supply, agricultural irrigation and mine fine particle solid transportation and other fields. In addition to the above-mentioned properties, polyethylene resins for pressure pipes are also required to have the following properties: (1) good creep resistance, that is, high long-term hydrostatic strength; (2) resistance to slow crack growth (slow crack growth,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F4/54C08L23/06C08K5/524
Inventor 石志俭唐岩杨宝柱王群涛戚思清谢建玲彭国霖谢侃
Owner CHINA PETROLEUM & CHEM CORP
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