Preparation Of Environmental Protection Blackboard Paint For Children

Graffiti is the beginning of the idea that children express themselves.Experts believe that graffiti can make children visual,brain,finger muscle coordination of the results of movement,reflects the physical and mental development of children,with the promotion of the formation of an integrated personality plays an important role.Children often like to pick up their own pen to free wall painting,free graffiti is the origin of children's innate creativity.Domestic and foreign researchers after a long time to track and observe,the experiment proved that if you want to improve children's IQ by 35%,you can let the children during the child to graffiti to improve IQ.Painting for children's healthy growth and quality of training are very important.Chalk is widely used tools in daily life,teachers spread knowledge,children's creative inspiration tool,generally used to write on the blackboard,if the chalk painting in the general paint brushing the wall can not be wiped clean,but most of the Parents in order to keep the walls clean and white,the idea of a child fleeting.This experiment focused on the development of a green,safe,stain-resistant performance is excellent,specifically for chalk painting interior paint,so that children enjoy the graffiti on the wall,just wipe gently with a damp cloth to be able to restore clean Walls.In this study,emulsion,fillers,additives and other aspects of analysis to get excellent stain resistance performance formula,according to a reasonable formula design ideas with a variety of raw materials to achieve environmental protection and stain-resistant combination.All-round study of the factors,the system design of environmentally friendly blackboard paint formulations and roller coating application process,focusing on performance.First,through a large number of basic experiments,the ratio of emulsion and pigments to determine the basis of formula,and then compare the different types of emulsion,different pigments and fillers on the stain resistance,film hardness,different surfactants or functional Polymer on the impact of stain resistance,the various factors are summarized comb.Second,the emulsion,pigments and fillers,functional additives for the handsome election,in the formula to add the appropriate amount of feldspar powder can improve the hardness of the film,but also improve the chalk writing comfort,the last need only water or detergent can wipe clean.Preparation of environmentally friendly blackboard paint,VOC content <20g / L,stain-resistant fraction of 70 points,pencil hardness of H.Third,children's environmental protection blackboard paint in accordance with GB / T9756-2009 standard detection ratio of 0.959(superior product is 0.95),wash-resistant times> 20000 times(excellent product is 5000),in addition to meet the standards of excellence Other performance improvements are needed,including post-construction paint odor,freeze-thaw stability,storage stability,and the like.To establish the evaluation method of the odor of paint film,the stability and compatibility of the diester high boiling point film-forming auxiliary agent are good and the isobutyric acid is not easy to be hydrolyzed,and the dry smell of the film is very low after the construction.Freeze-thaw stability,through a large number of freeze-thaw stability test,the formula of screening the appropriate dispersant and surface active anti-freeze-thaw additives can be significantly improved,and can reduce the amount of propylene glycol to reduce VOC content,to explore the factors affecting the stability of freeze-.Through a large number of experiments,cellulose with alkali swelling and associative polyurethane(HEC + ASE60 + TT935 + RM2020)can significantly improve product storage stability,after a long storage without stratification anti-rough phenomenon.Fourth,roller coating application process,focusing on the problem from the oil shrinkage,roller color coated latex paint color uneven color problem.High-grade latex paint(PVC <45%)Roller coating process,the surface of the film produced a large number of oil from the shrinkage and found that the stage of high-speed dispersing machine dispersion,very easy to bring in or produce small bubbles,often need to suppress foam properties Better defoamers,such as mineral oil type;then the high-speed dispersion stage in the paint mixing stage in the state of mixing,paint late often need to defoamer better defoamer specifically to eliminate the larger volume of large bubbles,such as organic Silicon modified polyether type,the above two defoamer feeding order can not be reversed,and the amount must be in order to achieve balance,paint film from the oil shrinkage and blistering phenomenon in general,13 seconds completely eliminated.It is found that the proper wetting agent can improve the color unevenness of the color blackboard.