Study On Self-cleaning Covering Materials Applied On Wood Based Panels

Environment and energy are two key problems being confronted with people in 21st century. Photocatalytic oxidation technique has become an ideal approach to solving these problems because it is capable of degrading pollutants promoting by solar energy at room temperature. With reference of current wood composites manufacture technology, this dissertation develops three ways to immobilize nanometer TiO2 photocatalyst on decorative paper to manufacture self-cleaning wood-based panels. Meanwhile, melamine- -formaldehyde (MF) resin—TiO2 system, liquid phase and gas phase photocatalytic degrading effects of self-cleaning papers with related environmental factors have been investigatedThe researches on melamine-formaldehyde (MF) resin—TiO2 system with IR spectrum and XRD implied that adding some proportional TiO2 into MF resin has not significant effect on MF resin itself. Applying ESR and SEM to test surface property of self-cleaning papers, the results showed that high active free radicals had some negative effects on the surface property of papers.It chooses three ways(technique one: mixing, technique two: spreading, technique three: making membrane) to manufacturing self-cleaning papers with 1%, 3%, 5% proportion respectively. The results show that all modified papers have good photocatalytic capability to degrading methyl orange solution and formaldehyde gaseous, and after analysis technique one or two with 3% TiO₂ proportion is more applicable and effective than technique three. Meanwhile, the photocatalytic capability of papers would decline in a long term.After taking detailed study on environmental factors such as different formaldehyde gaseous concentration, temperature and relative moisture content on photocatalytic capability of paper manufactured under technique one, it is found that there exists the most suitable temperature and moisture content for photocatalysis. At the same time, the photocatalysis complies with first order kinetic model and papers demonstrate good recycling capability.Finally, this dissertation demonstrates that such self-cleaning papers would have a promising perspective after making analysis from the points of technique modification, utilization quality and market competition.