SH固沙机理的微观探讨

Microstudy on mechanism of sand fixation with SH

SH是新型高分子固化材料,可用于广大沙漠区固沙,为环境修复材料。采用红外光谱,扫描电镜结合电子能谱等现代分析方法,初步揭示了SH固沙的本质,从微观上探讨了SH固沙强度形成的机理。研究结果表明,SH与沙子结合以后,SH本身的官能团对沙子没有化学键的结合,只表现出微弱的氢键及范得华力的影响;固沙强度主要是物理化学作用而形成的。氢键作用、吸附作用和絮凝作用等赋予了沙子很好的机械强度和优良的耐水性能而达到固沙的目的。

SH is a new polymer solidified material; it may be used for sand fixation in deserts. It is a repairing material for environment. In this paper, modern analytical methods have been used. These research methods include IR spectrum, scanning electron microscope (SEM) and X-ray energy dispersive spectrometer (EDS) techniques. Microstudy of the mechanism about sand fixation with SH has been made. The results show the importance of physicochemical action. This opens out the essence of sand fixation with polymer such as SH. The result indicates that the mechanism of sand fixation by SH is more complicated. It includes a set of physicochemical processes. After SH and sand being combined, the functional group of SH has no chemical bond to sand, it is only little hydrogen bond and Fan force influence of the strength. The strength of SH-fixated sand is the result of physicochemical action such as absorb, bridge, flocculate and ion exchange, etc. SH-fixated sand is not broken out in water, and resistance to wind erosion.