Preparation And Properties Of Kaolinite/PVC Membrane Structure Material And Surface Coating Agent

As a kind of new construction material, with low cost, good toughness, easy to shape etc. advantages, PVC membrane structure materials have widely been used in long-span structure such as large stadium, exhibition hall, leisure entertainment, etc. But, in these applications, PVC membrane structure material has weak ultraviolet radiation resistance performance and plasticizer would migrate to the membrane material surface, which make it is easy for dust and pollutants to adhere to the surface, thus affecting the membrane material pervious to light quality, beautiful and service life.Kaolinite is a dioctahedral 1:1 phyllosilicates type clay and has widely been used in the application of polymer matrix composites. Also kaolinite can be used to preparation some functional inorganic material with special structure and surface properties. In this paper, kaolinite as modifying agent has been applied in PVC membrane material and the effect of formulation and process conditions for properties, which provides the theoretical foundation as guidance for practical production.1) Organic calcined kaolinite was used to enhance PVC film, and by applying such methods as FTIR, TG, E-SEM, Torque rheometer, Mechanics performance testing XRD and UV-vis, the modified kaolinite and kaolinite/PVC composites were characterized. Filled with 10 wt% modified kaolinite, the comprehensive mechanical performance of PVC has achieved the best. Namely tensile strength of the composite has increased by 0.7 MPa, break elongation by 79.5%, and tear strength by 9.8 kN/m.2) Basic formula of PVC paste was designed, and by using rotating viscometer, the impacts of formula components content on viscosity and stability of PVC paste. By applying such methods as XRD, TG and E-SEM, the impacts of plasticizing temperature and time on the gelation and fusion processes of PVC paste.3) With natural kaolinite as raw materials, silica nanotubes (SiNT) as a support was obtained by multiplereplacementintercalation, calcination, acid treatment etc. and TiO2 doped silica nanotubes (TiO2-SiNT) catalysts were prepared by sol-gel method. The structural and morphological of kaolinite and its intercalation compounds were investigated by XRD, FTIR, FE-SEM,29Si CP/MAS NMR, FE-TEM and TG UV-vis absorption spectrum (UV-vis) and photocatalytic degradation experiments indicate that compared with pure TiO2, composite catalyst has 20% enhancement in the adsorption capacity, and has increased by 30% on the degradation of methyl orange in aqueous solution, after irradiation for 30min.4) TiO2-SiNT catalyst as modified agent was added to the containing fluorine coating agent for surface treatment process. By 1000 hours UV accelerated aging experiment, the whiteness and glossiness of PVC membrane material treatment with modified coating agent only reduced 1.9 and 5.1 respectively. The ESEM images showed that the membrane material surface was still smooth without precipitation of inorganic fillers. After 6 months outdoor exposure aging experiment, the antifouling of PVC membrane material treatment with modified coating agent was best.