Research And Preparation Of Inorganic Coatings For Building Interior Walls

ndoor air pollution,especially volatile organic compounds such as formaldehyde produced by indoor decoration,seriously threaten people's lives and health,and has become an issue of increasing concern to the people.Therefore,it is of great significance to develop environmentally friendly,effective,easy to construct and cost-effective indoor air purification coatings.Shell powder as a kind of waste which has high adsorption performance with extremely low cost,and titanium dioxide as a modern emerging photocatalyst,can be used as a safe and green means to decompose indoor organic pollutants.The application of shell powder in air purification coatings is currently rare,and titanium dioxide photocatalysts have problems such as low photocatalytic efficiency and low light utilization efficiency,which limit its application in the field of indoor air purification.In response to the above problems,this thesis carried out research work from the preparation of shell powder interior wall inorganic coatings and the modification of titanium dioxide photocatalyst to produce photocatalytic interior wall inorganic coatings that effectively remove formaldehyde.The main research contents of the thesis are:The most suitable ratio of shell powder inorganic filler was studied,and the interior wall paint was prepared with the silicate base material.The mixture of potassium silicate and lithium silicate is used as the film-forming material,and the shell powder is dispersed and mixed with inorganic ingredients such as quartz powder,ceramic powder,titanium dioxide,barium sulfate and other inorganic fillers as inorganic fillers.The best matching ratio of different types of fillers,and the use of sodium carboxymethyl cellulose solution and organic emulsion modified silicate base to improve the mechanical properties of the coating.The results show that the best ratio of inorganic fillers is shell powder:quartz powder:ceramic powder:titanium dioxide:barium sulfate=12:2:4:1:3,and 10 g base material corresponds to the carboxymethyl cellulose solution bonding The best addition amount is 2 g.(2)The adsorption properties of formaldehyde to the coatings prepared by calcining and modifying shell powder at different temperatures were studied.SEM characterization,formaldehyde test box adsorption test and acetylacetone spectrophotometric analysis were used to investigate the influence of the temperature of the calcined shell powder on the adsorption performance of the coating.The results showed that the coating made of shell powder,which was heated from room temperature to 400? at a heating rate of 10?/min,and calcined at 400? for 60 min,had better saturated adsorption performance for formaldehyde.In the formaldehyde test box,the coating made of calcined modified shell powder can reduce the formaldehyde content in the air by about 1 1.6%.(3)The preparation process of nano titanium dioxide photocatalyst was studied,and the titanium dioxide photocatalyst was modified by ion doping,and its photocatalytic decomposition ability of formaldehyde was studied.Using butyl titanate as raw material,the sol-gel method was used to explore the method of ion doping modification of nanometer TiO2,such as N,Cu,Fe,etc.,and the preparation of the nano-TiO2 The photocatalyst was characterized.The formaldehyde degradation performance of the coating prepared by adding doped nano-TiO2 photocatalyst to the shell powder inorganic coating was investigated in the formaldehyde test box.The results show that doping can effectively reduce the particle size of the prepared nano-TiO2 powder,and has good photocatalytic degradation performance of formaldehyde.The prepared coating can reduce the formaldehyde content in the air by about 22.82%.