Study On The Preparation And Properties Of Nanocomposite Panel

With the rapid development of social economy and the continuous improvement of living conditions,more and more attention has been paid to the living environment and the pollution produced in the interior decoration.Formaldehyde is a common indoor pollution gas,mainly from plate furniture and wood-based panel decoration materials,long-term exposure will pose a great threat to human health.As an environmentally friendly technology,photocatalytic oxidation technology has shown great advantages in dealing with refractory organic pollutants;nano-TiO2 has the advantages of good chemical stability and good photocatalytic performance.In this study,nano-TiO2 photocatalysis technology is combined with the veneer technology,using surface photocatalyst and mineral loading treatment for melamine impregnated paper and decorative veneers,making the formaldehyde capture layer in the veneer material,analyzing the influence of nano-TiO2 and mineral on the formaldehyde capture and degradation performance,including physical and chemical property,discussing the mechanism of formaldehyde degradation in nano materials.(1)TiO2/melamine resin was synthesized by magnetic stirring and ultrasonic dispersing,impregnating finishing materials with physically modified melamine,analyzing the microscopic appearance and characterization of decorative materials combined with scanning electron microscopy(SEM),DSC and FT-IR.,exploring the release of formaldehyde from hot pressed veneer.The results show that,the addition of a small amount of nano titanium dioxide did not affect the thermal curing property of melamine impregnated resin,and with the increase of the amount of nano titanium dioxide,the formaldehyde emission from the wood-based panel is decreasing,in the three kinds of wood-based panels with impregnated materials,the formaldehyde emission in the micro-veneer panels is the most obvious.When the amount of nano titanium dioxide is 2%,the formaldehyde emission of the micro-veneer panels and impregnated paper is the lowest.The addition of nanoparticles has no adverse effect on wettability,finishing performance and wear resistance of finishing materials.(2)Nano-TiO2 was dispersed in deionized water by magnetic stirring and ultrasonic dispersion.Impregnated the micro-veneer with the prepared liquid,exploring the effects of different hot pressing time,hot pressing temperature and nano TiO2 addition on the formaldehyde emission of the veneered panels,and the effects on other physical and chemical properties.The microscopic characteristics of decorative materials were characterized by scanning electron microscopy(SEM)and energy dispersive spectrometry(EDX).To explore the best process conditions for preparing impregnated veneer panels with low formaldehyde emission.The results show that,under the hot-pressing conditions of 160℃ and 90s,when the addition of nano-titania is 2%,the formaldehyde emission of the micro-veneer is lowest.The addition of nano-titanium dioxide had no adverse effect on the wettability of the facing material.After the coating treatment,there is no significant effect on the adhesion of the film,and the hardness of the veneer film is improved.(3)Using natural minerals as carrier,nano-TiO2 was loaded on to montmorillonite and zeolite substrates by high temperature sintering to prepare mineral-based composite photocatalysts.Effects of different loading ratios,mineral substrates,light types,and illumination time on the degradation of formaldehyde by the composite photocatalyst are explored.The microstructure of the composite photocatalyst was characterized by scanning electron microscopy(SEM)and X-ray diffraction(XRD).The composite photocatalyst was adhered to a micro-veneer material by impregnation with a suspension liquid.Test panel formaldehyde emission and other physical and chemical properties.The results show that,in the degradation test of formaldehyde solution,the degradation efficiency of the material to formaldehyde gradually increases with the increase of the load ratio of TiO2 in the TiO2/mineral composite from 50%to 80%;when the loading ratio of TiO2/mineral is 80:20,the concentration of formaldehyde is the lowest after 8 hours of UV irradiation.Using TiO2/mineral material suspension liquid with different load ratios to treat micro-veneer material,formaldehyde emission test of decorated wood-based panels was carried out.The results show that,with the increase of the loading ratio of TiO2 in Ti02/mineral material from 50%to 80%,the formaldehyde emission in the decorative panel gradually decreases.When TiO2/zeolite=80:20,the formaldehyde emission of the wood-based panels with minimal ultraviolet light irradiation of 8 hours is the lowest.The addition of composite photocatalyst reduces the wettability of the decorative panels and improves the hardness of the paint film.