高强聚丙烯纺粘针刺土工布的耐久性能

为研究高强聚丙烯纺粘针刺土工布（HPP）的耐老化性能和耐化学腐蚀性能，采用热氧老化、酸与碱腐蚀液和纯水浸泡等实验，研究了不同温度和不同化学环境对其耐久性的影响，将其与普通聚丙烯土工布（PP）耐久性进行对比。结果表明：当样品在热氧化温度为110、120、130 ℃条件下处理25d 时，HPP 土工布质量保留率分别为 99.06%、98.85% 和 98.10%； PP 土工布质量保留率分别为98.89%、98.78% 和 97.78%；HPP 土工布纵向断裂强度保留率分别为75.00%、67.25% 和 64.71%，PP 土工布纵向断裂强度保留率分别为 72.15%、65.56% 和 54.00%。在 3 种不同液体处理下HPP 土工布的强度损失率均未超过5.00%，表明 HPP 土工布具有良好的耐腐蚀和耐水浸泡性。通过Arrhenius 定理拟合出 HPP 土工布热氧反应速率表达式，预测出 HPP 土工布使用 50a 后的强度保留率为27.30%。

Durability of high strength polypropylene spunbonded needle punctured geotextile

In order to strdy the aging resistance and chemical crrosion resistance of high strength coarse denier polypropylene apunbonded needle punctured geotextile (HPP), samples were measured by theumo-oxidative aging, acid and alkali solution and pure water immersion. The effects of different temperatures and different chemical environments on their durability were studied and compared with the durability of ordinary polypropylene geotextiles (PP). The results show that the mass retention rates of HPP geotextiles after treating for 25 d are 99.06%, 98.85%and 98.10%, respectively, at 110?C, 120?C and 130?C. The retention rate of PP geotextiles after treating for 25 d is 98.89%, 98.78% and 97.78%, respectively. The retentionrate of longitudinal fracture strength of HPP geotextiles after treating for 25 d is 75.00%, 67.25% and 64.71%, respectively at110?C, 120?C and 130?C. At the same temperature circumstance the retention rate of longitudinal fracture strength of PP geotextiles is 72.15%, 65.56% and 54.00%, respectively. The strength loss rate of HPP geotextiles treated by three kinds of olpuids is less than 5%, indicating HPP has good corrosion resistance. The expression of the thermal reaction rate of HPP geotextiles is fitted by Arrhenius theory, and the retention rate of HPP geotextiles predicted is 27.30% after 50 a.