新型生物可降解PLA沙袋沙障降解特性及其影响因子探究

Analysis of Degradation Characteristic and Its Effect Factors of New Biodegradable PLA Sand Barrier

为了延长新型生物可降解聚乳酸(PLA)纤维材料在防沙治沙中的使用寿命,通过对野外铺设5a的PLA沙袋沙障材料采样测试,结合室内控制温度、湿度单因子试验分析了PLA沙袋沙障的降解特性及影响因子。结果表明:高温高湿条件能够促使PLA沙障材料在短时间内降解。在沙区迎风坡中部的PLA纤维机械性能损失最大;沙障暴露面PLA纤维的机械性能损失率比贴地面大,相差可达12.29%,沙障障体迎风面机械性能损失率最大。夏季雨后高温及频繁剧烈地风沙活动是影响PLA沙障材料降解的主要因子。

To delay the use time of new biodegradable poly lactic acid fiber in desertification control process, we investigated and determined the PLA sand barrier materials laied on the bare sand dune for 5 years and combined the laboratory experiments of single-factor controlling temperature and soil moisture to analyze degradation characteristic and its effect factors of PLA sand barrier. The results showed that high tempera- ture and high humdity could accelerate degradation process of PLA sand barrier materials. Mechanical per- formance loss of PLA fiber was the largest in mesoslope of upwind and windward side. The mechanical per- mormance loss of sand barrier materials exposing to air was larger 12.29% than that of sand barrier materials facing the ground, The high temperature occurred after rain in summer and fluent and intensive blown-sand activities were the main factors leading to PLA sand barrier material degradation.