Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Multimodal polyethylene pipe resin composition and preparation method thereof

A technology of resin composition and multimodal polyethylene, applied in the direction of pipes, rigid pipes, mechanical equipment, etc., can solve the problems of cracking or cracking, expensive, etc., and achieve the effect of excellent pressure resistance

Active Publication Date: 2013-09-18
PETROCHINA CO LTD
View PDF15 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pipes are exposed to numerous stresses during service that can cause cracks or ruptures that can be expensive to repair, especially when pipes are buried in buildings or underground

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multimodal polyethylene pipe resin composition and preparation method thereof
  • Multimodal polyethylene pipe resin composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The multimodal polyethylene pipe resin composition is prepared by three slurry reactors in series polymerization process, adding catalyst Z501, accelerator DDS, Si / Ti is 2, cocatalyst TEA in the first reactor, H2 in the first reactor / C2 (molar ratio) is 2; in the second reactor H2 / C2 (molar ratio) is 0.01, 1-hexene / ethylene (molar ratio) is 0.01; in the third reactor H2 / C2 (molar ratio) is 0,1-hexene / ethylene (molar ratio) is 0.1; the ethylene consumption ratio of the three reactors is 40:30:30. The test results are shown in Table 1.

Embodiment 2

[0039] The multimodal polyethylene pipe resin composition is prepared by three slurry reactor series polymerization processes, and catalyst Z501, accelerator DDS are added in the first reactor, Si / Ti is 4, cocatalyst TEA, and H in the first reactor 2 / C 2 (molar ratio) is 2; H in the second reactor 2 / C 2 (molar ratio) is 0.02, and 1-hexene / ethylene (molar ratio) is 0.02; In the third reactor, H 2 / C 2 (molar ratio) is 0.002, 1-hexene / ethylene (molar ratio) is 0.09; the ethylene consumption ratio of the three reactors is 42:31:27. The test results are shown in Table 1.

Embodiment 3

[0041] The multimodal polyethylene pipe resin composition is prepared by three slurry reactor series polymerization processes, and catalyst Z501, accelerator DDS are added in the first reactor, Si / Ti is 6, cocatalyst TIBA, and H in the first reactor 2 / C 2 (molar ratio) is 2; H in the second reactor 2 / C 2 (molar ratio) is 0.03, and 1-hexene / ethylene (molar ratio) is 0.03; In the third reactor, H 2 / C 2 (molar ratio) is 0.003, 1-hexene / ethylene (molar ratio) is 0.08; the ethylene consumption ratio of the three reactors is 44:32:24. The test results are shown in Table 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Densityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a multimodal polyethylene pipe resin composition and a preparation method and application thereof. The composition comprises component A, component B and component C, wherein the component A is an ethylene homopolymer, the component B is an ethylene copolymer formed through copolymerization of ethylene and alpha-alkene and has an average molecular weight greater than that of the component A, and the component C is an ethylene copolymer formed through copolymerization of ethylene and alpha-alkene and has an average molecular weight greater than that of the component B; the composition has density of 0.935 to 0.945 g / cm<3> and MFR5.0 of 0.1 to 0.5 g / 10 min, and the content of comonomers is 0.2 to 0.7% by mol; each component has narrow molecular weight distribution, and Mw / Mn is equal to or less than 5. A pipe prepared from the polyethylene composition has excellent pressure resistance, and time to failure of the pipe is greater than 500 h when the pipe is tested both under the conditions of a temperature of 20 DEG C and circumferential stress of 13.9 MPa and under the conditions of a temperature of 80 DEG C and circumferential stress of 5.6 MPa.

Description

Technical field: [0001] The invention relates to a multimodal polyethylene pipe resin composition, a preparation method thereof, and a prepared pressure-resistant pipe. Background technique [0002] Polyethylene resins can be used in the production of pipes and their fittings. Pipes are exposed to numerous stresses during use which can cause cracks or ruptures which are expensive to repair, especially when the pipes are buried in buildings or underground. Therefore, the pipe resin requires a combination of high rigidity and good toughness to improve its resistance to long-term hydrostatic strength, resistance to fast crack growth and resistance to slow crack opening. [0003] High-density polyethylene pipes are widely used because of their superior long-term hydrostatic strength resistance, especially the third-generation polyethylene pipe resin PE100, which can be used for 50 year. 10MPa is the lower confidence limit (LCL) of the long-term hydrostatic strength. LCL is th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08L23/06C08L23/08C08F110/02C08F210/16C08F4/646F16L9/12
Inventor 邹恩广张丽洋张瑞王斯晗姜进宪宋磊韦德帅王华付义任鹤王立娟何书艳赵增辉马丽张瑀健方宏王文燕张明强梁立伟孙海涛王焱鹏刘丽莹
Owner PETROCHINA CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com