We conducted accelerated aging experiments on two types of polypropylene (PP) nonwoven geotextiles (filament geotextile and staple fiber geotextile), immersing them in five different simulated liquids at temperatures of 25 °C, 55 °C, and 85 °C for 200 days. At 85 °C and a pH of 1, the tensile strength and elongation at break of PP filament materials decreased by 95% and 86%, respectively. The presence of heavy metals(arsenic and cadmium), speeds up the aging process in both types of PP geotextiles. Under identical conditions, these heavy metals can increase the loss of tensile strength in geotextiles by more than 7% in 200 days. Increases in temperature, acidic environment, and heavy metal concentration all contribute to faster aging of these geotextiles. Although filament geotextiles exhibit higher tensile strength and elongation at break, staple fiber geotextiles show a lower rate of tensile strength loss during aging and better maintain their tensile strength in high-temperature acidic conditions. During the aging process, cross-linking and recrystallization occur, both of which control the aging rate and the formation of microplastics.

中文翻译：

---

模拟重金属老化场景下聚丙烯非织造土工布老化机理研究


我们对两种类型的聚丙烯（PP）非织造土工布（长丝土工布和短纤维土工布）进行了加速老化实验，将它们在25℃、55℃和85℃的五种不同的模拟液体中浸泡200天。在85℃、pH为1时，PP长丝材料的拉伸强度和断裂伸长率分别下降95%和86%。重金属（砷和镉）的存在会加速两种聚丙烯土工布的老化过程。在相同条件下，这些重金属可使土工布的拉伸强度损失在200天内增加7%以上。温度、酸性环境和重金属浓度的升高都会导致这些土工织物更快老化。虽然长丝土工布表现出较高的拉伸强度和断裂伸长率，但短纤维土工布在老化过程中表现出较低的拉伸强度损失率，并且在高温酸性条件下更好地保持其拉伸强度。在老化过程中，发生交联和再结晶，两者控制老化速率和微塑料的形成。