Study On Preparation And Properties Of Degradable Formaldehyde Environmentally Friendly Materials

Photocatalytic technology is an emerging research field and a new technology for treating indoor air pollution.Solar energy can be widely used to degrade organic materials and has a broad application prospect.At present,the photocatalytic efficiency of commonly used Ti O₂ is not high due to various factors,so the research and development of new visible light catalyst is the focus of current scientific research.At present,total volatile organic compounds（TVOC）released after interior decoration are considered to be an invisible killer of human health,and the harm of formaldehyde is more prominent.In this study,formaldehyde degradation was used as the target pollutant and representative pollutant,and photocatalytic technology was applied to interior wall latex paint.Mainly describes the following four aspects of research:（1）through a simple hydrothermal method in different calcination temperature preparation preparation bismuth tungstate（Bi₂WO₆）,and according to the effect on the degradation of rhodamine B as photocatalytic performance evaluation standard,evaluation of Bi2WO6prepared under different calcination temperature,cycle and degradation of rhodamine B test was the best performance of the stability of the photocatalyst.Bismuth molybdate（Bi₂MoO₆）was prepared from bismuth pentahydrate nitrate and ammonium molybdate as precursors at different calcination times and the degradation effect of rhodamine B was used as the standard for evaluating photocatalytic performance.The experimental results show that Bi2MoO6prepared with calcination time of 24h has the best photocatalytic performance.In the photocatalytic degradation experiment,the degradation rate of rhodamine B at 5mg/L reached80%.The degradation rate of bismuth molybdate prepared under the calcination time of 20h reached 60%.（2）Explore the effect of visible light catalytic degradation of formaldehyde in environmentally friendly latex paints made by adding different photocatalysts,different catalyst addition amounts,and different components of photocatalysts,and determine the best photocatalyst addition scheme based on this.And the stability test of the environmentally friendly latex paint prepared by the best scheme was performed,and the results proved that the stability of the environmentally friendly latex paint prepared was good.（3）To explore the bismuth molybdate and tungstate bismuth two light push agent on the properties of latex paint and practical effects,test results and the interior wall paint,synthetic resin emulsion（GB/T 9756-2009）,the paint viscosity determination:stowe’s viscosity meter law"（GB/T 9269-2009）,"interior decoration decorates material-interior wall coating of harmful material set limit to"（GB/T 18582-2008）,and other national standards.The effects of bismuth molybdate and bismuth tungstate on the practical properties of latex paint were investigated.The comparison standard of the test results is Synthetic resin emulsion interior wall coating（GB/T 9756-2009）,determination of coating viscosity:stormer viscosimeter method（GB/T 9269-2009）,interior decoration materials--limitation of harmful substances in interior wall coating（GB/T 18582-2008）.The experimental results showed that:by the bismuth molybdate and bismuth tungstate mixed in different proportions into the latex paint,at the same time adjust the content,in the total weight of 3%-6%of the environmental latex paint prepared,the evaluation of the environmental latex paint free formaldehyde,washing resistance,alkali resistance,construction,ratio,particle size,drying time,freeze-thaw resistance and other properties have reached the national standard level and better performance.The degradation rate of formaldehyde standard gas was used as the evaluation standard.In the discussion of degradation effect,we also compared nano-scale Ti O₂ with the same mass fraction.The results showed that the degradation rate of latex paint was positively correlated with the content of catalyst.The degradation rates of catalysts with the same mass fraction in latex paint are compared as follows:Bi₂WO₆&Bi₂MoO₆>Bi₂WO₆>Bi₂MoO₆>nanometer Ti O₂.The experiment of formaldehyde degradation of the best environmental protection latex paint was carried out.The results showed that all the indexes were in conformity with the national standards for photocatalytic degradation of formaldehyde latex paint,and the basic properties of environmental protection latex paint were also in conformity with the national standards.