Plastic Pipes Conference Association # 2023 Lake Buena Vista
Yunyan Li, Qianshi Ma, Haihua Yu
Effect of sunlight and high temperature on PE-Xa pipe’s performance was investigated in this work. Pipes with different formulations, including formulations without and only with antioxidant, and formulation with both antioxidant and light stabilizer were employed to study the relationship of cross-linking density, tensile strength, Vi-cat softening temperature, hydrostatic strength with exposure time.
perature, hydrostatic strength with exposure time. The results showed that the cross-linking density for all formulations decreased with exposure time and especially, the most severely for pipes without antioxidants or light stabilizer. The cross-linking density of pipe without and with only antioxidant is much lower than 70% after exposure for 90 days and 140 days respectively. However, for pipes with both antioxidant and light stabilizer, the cross-linking density is still higher than 70%, even after being exposed for 500 days. Further, for pipes without and with only antioxidant, the tensile strength increases at the initial stage and decreases later. Specifically, for pipe without antioxidant, the tensile strength approach to a maximum of 23.2MPa after being exposed for 98 days and decreased to nearly 0 MPa after 370 days. For pipe with only antioxidant, the tensile strength increases to 23.5MPa after being exposed for 140 days and decreased to 0 MPa after 427 days. However, for pipes with both antioxidant and light stabilizer, the tensile strength is just fluctuating within a small range and keeps to be 18.2 MPa after 500 days. And also, the results showed, exposure may lead to a poor tough and hydrostatic strength, that is, pipe without and with only antioxidants and pipe with both antioxidant and light stabilizer, all failed to pass the 95/22hours hydrostatic sustained pressure testing, after being exposed for 35,112 and 370 days respectively
Performance of pipes with antioxidant and pipe with both antioxidant and light stabilizer that have been properly stored for 500 days is not much different with that before the exposure. Proper protection can ensure the performance and service life of pipes with reasonable and high-quality formulations. However, the performance of pipes without antioxidants is still slightly degraded after 500 days of storage, indicating that the poor or unqualified formulations cannot stand the test of time even if they are properly stored.
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