China Plastics ›› 2021, Vol. 35 ›› Issue (6): 33-39.DOI: 10.19491/j.issn.1001-9278.2021.06.006

• Materials and Properties • Previous Articles     Next Articles

Photo⁃oxidation Aging Performance and Life Prediction for High⁃density Polyethylene Pipe

ZHAO Xingmin1, ZHAO Jianping1(), YAN Jizhong2   

  1. 1.School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211816,China
    2.Jiangsu Special Equipment Safety Supervision and Inspection Institute,Nanjing 210036,China
  • Received:2021-01-18 Online:2021-06-26 Published:2021-06-23
  • Contact: ZHAO Jianping E-mail:jpzhao_njtech@163.com

Abstract:

An artificial accelerated aging method was adopted to simulate the photo?oxygen aging process of high?density polyethylene (PE?HD) pipes and butt fusion joints under the natural sunlight. A UVA?340 standard fluorescent ultraviolet lamp was used to simulate the aging process in the two cycle modes of light and condensation at different temperatures of 50 ℃, 60 ℃ and 70 ℃. Infrared spectroscopy was also conducted to analyze the chemical structures of the aged pipe and joint samples. The results indicated that with an increase in aging time, the joint showed higher peak intensity for the olefin and carbonyl absorption in the joint than that in the pipe due to the increase of the photo?oxidation aging degree. Meanwhile, the oxidation induction time of pipes and joints were measured with different aging time at different temperatures. The oxidation induction time and the relationship between natural sunlight and fluorescent ultraviolet lamp irradiation were fitted by means of the kinetic curve linearization method, and a life prediction model for the natural light aging of high?density polyethylene pipes was proposed. The results indicated that the lifespan of PE?HD butt fusion joints exposed to the natural environment was 33.76 % shorter than that of the pipes at room temperature.

Key words: high?density polyethylene, pipe, butt fusion joint, photo?oxygen aging, oxidation induction time, life prediction

CLC Number: