Civil Works Asymmetric Solid-liquid Separation Membrane's Structure And Properties

This project researches hot plate Civil Works Asymmetric Solid-liquid SeparationMembrane's (CASSM) structure and properties, and explores the new method for preparationseparation membrane. By means of changing hot-pressing temperature and time of the platewhich presses the polypropylene (PP) needled nonwoven base fabrics can get CASSM which hasa good penetration. The new method is that laminates the PP microporous membrane on the PPneedled nonwoven base fabrics to get CASSM, and uses polyacrylic ester class glue andpolythene(PE) powder as the binder. The paper gets the best hot-pressing temperature and timein hot plate method and broads the idea in new methods.The main research contents: Prepares sample which are including the hot plate membranesand laminated membranes, tests the samples' main performance and researches the influence ofhot pressing conditions on membrane's properties. The three methods are useful that the processis simple and the operation is convenient. Along with the increase of temperature and theextension of time, thickness, aperture and permeability decreases and hydraulic conductivityincreases. The hot plate membrane has a good penetration, but the laminated membranes'penetration is poor. The hot plate membrane can get a good tensile properties whentemperature/time is165℃/2s or170℃/2s, the glue membrane can get a good tensile propertieswhen temperature/time is110℃/2s and the powder membrane is130℃/2s.The result shows that when temperature/time is165℃/2s or170℃/2s the hot platemembrane has the best properties which is suitable for concrete works. The glue membrane andthe powder membrane in this paper just apply to gas-liquid separation or Gas-solid separation forgood water seepage control performance.