Preparation Of Diatomite Coatings For Making New-style Wallpaper

Diatomite is a non-metallic minerals, its chemical composition is SiO2, its advantage is that it has large porosity、strong absorbent stability chemical、wea、heat etc. Using diatomite as coating, because of the porous properties of the diatomite, it can adjust the ambient humidity, it also has bactericidal, deodorant, in addition to formaldehyde, reducing the role of toxic substances.This thesis is to find a recipe to prepare a new-style of diatomite wallpaper.At first, this paper discuss moisture absorption and desorption detection methods of the wallpaper. Reference the method of construction materials, identified two test methods, one is a supersaturation of environmental law, This method can measure the absorption efficiency of the wallpaper unit time in the saturated environment. but it can’t reproduce the real life environment humidity The other is a saturated solution method. this method is able to moisture absorption and desorption of various humidity, but with a certain error. Through the comparison of the two methods, saturated solution method is better for wallpaper.Diatomite is added into the pulp, the experiment is that diatomite is added into pulp without retention aid. Found that30%add will have a good retention rate, which is about55%. and in the supersaturation environment wallpaper has the maximum moisture absorption. Water absorption capacity can reach twice the wallpaper quality.In the process of makir the coating. Using sodium tripolypHospHate、sodium hexametapHospHate、sodiun、(?)yacrylate as dispersant, CN-154as defoamers, CMC as aquasorb,2011-glue as the adhesive, glyoxal as crosslinking agen, DOP as plasticizer, NaOH as pH regulator, sodium alginate as thickener. There are a detailed study of diatomite dispersant selection and dispersion conditions, the selection and optimization of adhesive, and the coating methods. Ultimately determine the coating formulations of the diatomite original soil and calcined soil. Disperse concentration30%, the amount of sodium tripolypHospHate0.6%、sodium hexametapHospHate0.6%、sodium polyacrylate0.8%, regular pH to10. scattered15min, the dispersion speed1500r/min. For the original soil, the amount of2011-glue for50%, CMC0.01%, glyoxal0.08%, sodium alginate1.2%, DOP0.08%. For calcined soil, the amount of2011-glue for45%, CMC0.01%, glyoxal0.08%, sodium alginate1%, DOP0.08%. Due to the relatively low solid content in the paint preparation, choose roller coating for paint to coating, obtained wallpaper after drying.the flexibility of the wallpaper is better, and better moisture absorption and desorption properties compared with the Japanese diatomite wallpaper.