动态自调节导水复合涂层的过程行为及应用(英文)

Process Behavior and Application of Dynamic Self-Adjusting Water-Transferring Composite Coat

制备了一种用于荒漠化治理中节水造林的动态导水复合材料。该材料是由不同比例的高吸水性树脂与蒙脱土复合于纤维支撑体表面构成涂层。用SEM分析了涂层材料的显微结构,用热分析研究了材料的吸脱附水特性,用快速水分仪测定了不同土壤湿度条件下材料的导水参数。结果表明:蒙脱土颗粒能够拆解并分散于高吸水树脂的枝状体结构中;通过树脂对蒙脱土的支配作用所产生的蒙脱土颗粒的空间连续性来确定其导水速率,该速率随土壤湿度的降低而增加;使用该材料后云杉树苗成活率得以大幅度提高;涂层材料对土壤湿度的自调节作用为植物生长提供了合理的水分条件。

A kind of water - transferring composite used for water saving and planting in desertifieation controlling was prepared. It was composed of different proportions of polyacrylamide solutions and montmorillonite coated on fibre. The micro - appearance of the coated fibre and the micrestructure of the coat were described by scanning electron microscope. The water desorption characteristics of the coat were detected by thermogravimetry. The water - transferring capabilities of the coated fibre in soil with various moisture were analysed by rapid moisture meter. The results show that montmorillonite grains disperse throughout the branches of polyacrytamide. Water transfer rate is determined by spatial continuity of the grains which is caused by dominant action of polyacrylamide on montmorillonite under different water potentials of the coat. The rate increases with soil moisture decreasing. The survival rate gets higher when the coat is applied to picea asperata mast. Self - adjustment of the composite coat to soil moisture provides appropriate water to plants.