China Plastics ›› 2022, Vol. 36 ›› Issue (12): 24-30.DOI: 10.19491/j.issn.1001-9278.2022.12.004

• Materials and Properties • Previous Articles     Next Articles

Structure and properties of temperature⁃resistant PE⁃HD pipe material

ZHU Jingyun1(), GU Fenglai2, YAN Wei1, YI Huijun1   

  1. 1.Beijing Yanshan Petrochemical High?Tech Company Limited,Beijing 102500,China
    2.Beijing Yanshan Petrochemical Synthetic Resin Plant,Beijing 102500,China
  • Received:2022-08-26 Online:2022-12-26 Published:2022-12-20

Abstract:

The microstructures of the domestic PE⁃HD product (8100M) and some imported PE⁃HD products were comparatively analyzed using infrared spectrum, differential scanning calorimeter, gel permeation chromatography, and nuclear magnetic resonance. The performance of cross⁃linked PE⁃HD samples was further investigated. The results indicated the cross⁃linking degree of PE⁃HD could be improved by reducing MFR, enlarging molecular weight distribution, and adding co⁃monomer. The design for the MFR of PE⁃HD 8100M was considered to be reasonable, together with a high average molecular weight and narrow molecular weight distribution. The PE⁃HD 8100M powders exhibited a concentrated particle size distribution and a larger average particle size. This facilitates the uniform dispersion of additives in the matrix. The cross⁃linking reaction of PE⁃HD first occurs between macromolecules, resulting in a decrease in the tensile properties of PE⁃HD decreased after cross⁃linking. The extruded pipe based on PE⁃HD 8100M passed the classification certification and was assessed to be the PE80 grade pipe material.

Key words: peroxide, high density polyethylene, pipe, average particle size

CLC Number: