Construction And Properties Research On The Super-hydrophobic Surfaces Of PVC Membrane/Nano-SiO₂Particles

In a variety of large global event held in recent years, membrane structure showing itssuperiority in temporary large venues increasingly, and promoted its usage in a wider area.PVC membrane occupied a larger market share by the advantage of low-cost, but when themembrane structure was used in the permanent construction, hard to clean and easy gettingdirty while the PVC membrane exposed to the atmospheric contamination limits itsdevelopment. The proposition of self-cleaning solved the major problem of cleaning thebuilding’s exterior, along with the development of in-depth study on the "lotus effects",eventually developed a comprehensive study of superhydrophobic self-cleaning surfaces, butthe cumbersome experimental operation and expensive equipment made most of the techniqueremained in the laboratory stage.Considering the characteristics of PVC architectural membrane materials, the study foundbuilding rough structure on the surface of PVC by using nanoparticles is a simple and effectivemethod for the preparation of superhydrophobic surfaces, and preparation and modification ofnano-SiO2has tended to be improved, so in this thesis we study on constructingsuperhydrophobic surfaces in PVC membrane surface by using nano-SiO2.In this research, the FE-SEM, TEM was main used to analyze the shape of final particlesand explore the effects of pH environment on the hydrolysis of TEOS and the forming of SiO2particles, and prepared specified size of the spherical monodisperse SiO2particles, the averagesize was500nm,200nm and80nm respectively, and a film by dip coating on the glass surfaceformed different rough surfaces, the smaller particle size got the higher surface roughness.Prepared PAA/SiO2core-shell particles by adding PAA in the hydrolysis process of TEOS,analyzed the structure of the core-shell particles with FE-SEM, TEM, FTIR, X-ray diffraction,and TG, adjust the structure of particles by changing the amount of PAA and TEOS, coatingwith the core-shell particles in the glass surface got a higher water contact angle than the normal nano-SiO2. Modified the particles with KH570, compared the IR absorption spectradetermine the success of modification, coating on the glass with modified particles got a betterhydrophobic surface than it on the surface of PVC membrane. Coating on the surface of glassand PVC with different particles, observed and analyzed the water contact angle, finally foundthat the single-layer coating of modified core-shell particles in the glass surface got the highestwater contact angle of156°, using the unmodified core-shell particles coating on the surfaceof PVC membrane twice get the highest water contact angle of152°.