Study on Applicability of Heat⁃resistance Non⁃crosslinked Polyethylene in High Salinity Brine

doi:10.19491/j.issn.1001-9278.2021.10.015

Abstract

Abstract:

To explore the applicability of heat-resistance non-crosslinked polyethylene （PE-RT） in the salt water at three different temperatures of 80， 85 and 90 °C， an immersion experiments was conducted to simulate the real working condition. The water absorption， tensile strength， elongation at break and molecular structure of PE?RT before and after immersion were characterized using a universal tensile testing machine and infrared spectrometer. The result indicated that although PE?RT absorbed water， resulting in an increase in weight after immersion， the maximum water absorption was about 0.65 %. This result is far less than the range specified in the ISO 23962?1 standard. After immersion for 28 days， the PE?RT present a variation rate of tensile strength between -15 % and -9 % and a variation rate of elongation at break between -30 % and -24 %. This meets the requirements of ISO 23962?1. The PE?RT underwent oxidation and chain scission at an immersion temperature of 90 °C. Therefore， the material developed in this study is recommended to use in salt water at a temperature lower than 85 °C.

Key words: heat?resistant non?crosslinked polyethylene, salt water, applicability

CLC Number:

TQ325.1⁺2

CHEN Lijuan, LIU Pu, DONG Lei, LIU Chang, FAN Xuehua, ZHANG Sheng, SUN Jun, WANG Jingbao, ZHAO Jingmao. Study on Applicability of Heat⁃resistance Non⁃crosslinked Polyethylene in High Salinity Brine[J]. China Plastics, 2021, 35(10): 88-91.

Figures/Tables 5

Fig.1. Change of water absorption rate of PE?RT after brine soaking

Fig.2. Tensile strength change rate of PE?RT after brine soaking

Fig.3. Elongation at break change rate of PE?RT after brine soaking

Fig.4. FTIR spectra of PE?RT

Fig.5. FTIR spectra of PE?RT after being soaked in brine at different temperature for 28 d

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