The water-based electromagnetic shielding coating is an inevitable trend in the development of conductive coatings, because solvent based coatings will volatilize a large number of harmful substances (such as VOC) in the process of use, which will have a harmful impact on the environment and people's physical and mental health. Researchers in some developed countries have found that building coatings, as decorative and protective materials for buildings, contain aromatic, halide, formaldehyde and various toxic volatile organic compounds VOC, which have a great impact on human health. Long term absorption of VOC will lead to fatigue, loss of memory and coordination functions and nervous system diseases.
VOC will decompose into highly active molecules under the solar ultraviolet radiation, and it is easy to react with no and so in industrial gas emissions, generate photochemical oxidants harmful to human body, generate smoke and acid rain, and worsen the atmospheric environment. With the development of society, people's awareness of environmental protection is more and more strong. Now some large buildings or important places have required the use of water-soluble coatings, most of the existing coatings are difficult to meet this requirement. Water soluble conductive coatings not only have good electromagnetic shielding function, but also have certain environmental protection performance, and its cost is greatly reduced compared with solvent based coatings, so the development and research of water soluble conductive coatings is imperative.
Water soluble coating is a kind of coating which introduces hydrophilic or water soluble groups into the film-forming polymer and makes it a water-soluble medium. It is a new type of low pollution, energy saving and resource saving coating developed in 1960s. Due to its obvious advantages, the research and application of water solubility of coatings have attracted extensive attention and made important progress.