R&D Of Environmental And Healthy Building Paints

In the last 10 years, the quality of paints for architecture have mainly been developed to high performance, environmental protection, bacteria-proof function, in which paints with environmental protection will expand on the large scale. The main emphasis on inner-wall paints should be taken seriously to health, environmental protection and safety ,containing being water-soluable environment protected and bacteria-groof . In japan, an amendment law on construction standards has been implemented,which is stipulated that the products containing formaldehyde should not be used indoors,including urea-formaldehyde resin, melamine resin and resorcinol resin. In our nation the regulation for indoor hygiene will also appear publicly acquiring that paints containing benzene, aromatics, dissociative formaldehyde, dissociativeTDI, DOP, ethylene glycol, ester, heavy metal, and volatile organic substance etc. will be used limitedly, which will drive forward the development of paints for environmental protection. In order to solve the problems of indoor pollution effectively, some developed countries such as japan have put forward some schemes including adding nano-TiO2 in traditional construction materials to increase the ability of light catalysis for air purity performance. These methods can effectively decrease the pollution concentration of air invironment, however, ultraviolet light must join the process,the purity effect is not good at being used indoors. On the contrary, rare-earth activation technique can make it easier to light-catalyse, and at the same time, healthful negative ion can be produced to make the indoor air clear and fresh and improve the living conditions.In this thesis, rare-earth was pulverized by Raymond mill and GS-500 grinding mill, and the new-fangled paints with environmental and healthy protcetion was made by adding the pulverized rare-earth in the traditional production. The effect on the number of negative iorns was studied by adding varied content of rare-earth with the same granularity and the varied granularity with the same content of rare-earth. It was showed that the more content and the finer granularity of rare-earth , the more number of negative irons. At the same time, the perfomance of paints was detested by national standards, including traditional and bacteria-groof performance, radiation and purity . the results showed that the traditional performance did not change by adding 2-3% granularity of rare-eath and the readiation specification was in the safe scale by producing 800-1000 negative irons per cm3, the diameter of anti-bacterial circle to golden staphylococcus is 18 millimeter, the diameter of anti-bacterial circle to colon bacillus is 22 millimeter, the purifying formaldehyde ratio comes to 65.3 percent and the purifying ammonia-gas ratio comes to 52.11 percent. So the coating has effectiveanti-bacteria function and purifying function. In the analog normal house, we painted the indoor coating which can produce negative ion by activating rare-earth. The negative ion concentration is 800-1000 per cm3. The negative ion concentration is just the same as the concentration in a city-park. So it's just as if we built a small park indoors. It's very significative for improving people's living condition.