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The Preparation and Study of a Novel Photo Catalytic Aqueous Polyurethane Material

Author: WeiYang
Tutor: ZhongYinPing
School: Sichuan University
Course: Biomedical Engineering
Keywords: Waterborne Polyurethane Titanium dioxide Dispersion properties Composite photocatalyst Antibacterial
CLC: R318.08
Type: Master's thesis
Year: 2005
Downloads: 177
Quote: 1
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Abstract


Waterborne polyurethane material because of its safe , non-toxic , energy-saving , easy processing , good flexibility , low temperature resistance , fatigue resistance and chemical resistance excellent performance , and is widely used in various fields of national life , and nano titanium dioxide is the Photocatalytic materials Research more excellent bactericidal effect can break down many harmful organisms , but also because of the characteristics of long-lasting, broad-spectrum , economic , convenient , and therefore generally favored by the world . This thesis, waterborne polyurethane material with nano titanium dioxide combining the preparation of a new green photocatalytic water-based polyurethane material . Nano- titania surface energy , waterborne polyurethane material easy reunion to hinder its photocatalytic performance of the play ; another nano titanium dioxide optical response is only limited to ultraviolet light , and to limit the use of sunlight and indoor lighting . Therefore, improving the titanium dioxide nanoparticles in aqueous polyurethane dispersion capabilities and to expand the range of its optical response is key to producing high-performance photocatalytic water-based polyurethane material technology . In this thesis, using the sol-gel method SiO 2 / TiO 2 composite photocatalyst prepared on this basis the doped Fe 3 the the fe 3 < / sup > / SiO ╱ the TiO 2 < / sub> composite photocatalyst and dispersed into a water-based polyurethane system the SiO 2 < / sub > ╱ TiO 2 - PU and Fe 3 / SiO 2 / TiO 2 < / sub >- PU two new water polyurethane composite material . Fourier transform infrared spectroscopy ( FTIR ) , X - ray diffraction (XRD) and transmission electron microscopy (TEM) test showed that TiO 2 surface successfully coated on SiO 2 composite photocatalyst average the particle size of up to about 90nm ; Fe 3 completely infiltrated TiO 2 lattice internal ; composite particles smaller grains help to improve its photocatalytic activity . The spectrophotometric tests show that the surface coating of SiO 2 , the use of sodium silicate , PEG -800 and SDS three surface -active agent surface modification methods can improve the SiO 2 < / sub> ╱ TiO 2 Fe 3 / SiO ╱ TiO 2 in the dispersion properties of waterborne polyurethane emulsion . When TiO 2 the quality percentage content of 20% , and 1.0% SDS

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CLC: > Medicine, health > Basic Medical > Medical science in general > Biomedical Engineering > General issues > Biomaterial
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