等离子体处理改性及分子接枝增强防水卷材与混凝土界面粘接力

Plasma treatment modification and molecular grafting enhancement of adhesive force between waterproofing membrane and concrete interface

针对沥青基防水卷材在混凝土表面粘接效果的改进问题,系统研究了表面氧气、氮气、空气等离子体处理改性及分子接枝防水卷材后的表面基团变化情况。通过等离子体处理建立起的表面基团,进而进行硅烷试剂、多巴胺以及木质素等多羟基或硅基功能分子后修饰,达到分子枝接以及混凝土粘接性能的优化。通过接触角、红外光谱、XPS等分析发现,等离子体处理改性后的沥青基防水卷材表面表现出了明显的亲疏水性变化以及相应的化学官能团吸收峰,证明了等离子体处理改性表面基团的实现以及枝接分子的成功,能够增强防水卷材与混凝土的粘接性能。

For the improvement of asphalt-based waterproofing membrane bonding effect on the concrete surface,this paper systematically studied the changes in surface functional groups after surface oxygen,nitrogen and air plasma treatment and molecular grafting of waterproofing membranes.The surface functional groups established through plasma treatment are further modified with polyhydroxy or silyl functional molecules,such as silane reagents,dopamineand lignin,to optimize molecular branching and concrete bonding capacity.Through the contact angle measurement,infrared spectroscopy,XPS and other means,it found that the plasma treatment of modified asphalt-based waterproofing membrane surface shows obvious hydrophilicity changes and the corresponding chemical functional group absorption peaks,proving the realization of the plasma treatment of modified surface groups and the success of the branching molecules.It can enhance the bonding effect between waterproof membrane and concrete.