不同粘土与聚丙烯酰胺复合导水涂层的自调节导水性能及机理

Self-Adjusting Water Conductivity Property and Mechanism of Water-Release Coatings Prepared with Polyacrylamide and Differernt Clays

用聚丙烯酰胺(PAM)分别与普通粘土、高岭土、蒙脱土(MMT)复合制备导水涂层材料,然后涂覆在纤维表面制备导水涂层纤维。利用水分快速测定仪、热分析仪、扫描电镜分析比较其导水效果并研究其导水机理。结果表明,蒙脱土-PAM复合涂层导水效果最好,蒙脱土颗粒粘附在PAM网络结构中,通过PAM的溶胀和脱水,使蒙脱土发生断桥和桥接,从而根据土壤湿度自动调节导水速率。现场植树试验表明其能明显提高苗木成活率。

Common clay,kaolin and montmorillonite(MMT)were respectively compounded with polyacrylamide(PAM)to prepare coating materials,which were coated on the fibers to prepare water-release coated fiber.The water-transmitting capacity and mechanism of coated fiber were studied by Perkin Elmer Diamond SⅡ thermal multi-analyzer,SEM and instrument for quick measurement moisture.The results show that the water-transmitting performance of PAM-MMT composite coating is the best.MMT particles are adhered in staggered network structure of PAM and they can fracture bridge and bridge together through swelling and dewatering of PAM.So the coated fiber can transmit water with a self-adjustable speed according to the soil moisture.Tree-planting experiments demonstrate that it can significantly raise the seedling survival rate.