Study On The Preparation Of Cuprous Thiocyanate Nanoparticles And Application In Nano-compound Paint

After corrosion,fouling is the most important problem to take into account in ship hull's protection .Antifouling paints give protection against fouling attack.Toxicants are leached from the paint and generate alayer high bioactivity by toxicant solubilization in the paint surface/seawater interface .This high toxic concentration in the vicinity of the film prevents larval or propagules settlement.the effectiveness of these paints is highly dependent on the kind of toxicant present in the film .Cuprous thiocyanate is a kind of fine inorganic antibacterial agent, which can prevent the survival and reproduce of bacteria. It is innoxious, not harmful for human and environment. Nanoparticle differs from other normal particles in heat, magnetism, light, sensitivity characteristic and surface stability due to its peculiar characters. According to the basic characters of nanoparticle, it is expected that antibacterial and bactericidal activation of CuSCN can be advanced by adding CuSCN nanoparticles into coating, which can improve the antibacterial and bactericidal function along with antifouling of coating.Preparation, modification and application of cuprous thiocyanate nanoparticles were mostly introduced.Cuprous thiocyanate nanoparticles were prepared by Converse-disproportionation reaction method and Liquid-phase precipitation method as well as direct precipitation method and transformation of precipitation method, The factors that influence the size of particles were investigated. These factors include quantities of dispersant, the concentration of reactants, and pH value. The best conditions in preparation is given. TEM, SEM, IR and XRD were used to characterize the particles. The result suggests that the particles are fine and the size of the particles was 70～90nm.On the foundation of upwards of studies, the modification of nano-cuprous thiocyanate was researched. Before using different modificator, C₆H₁₄O₆ is choosed as the best modificator by testing the height of sedimentation in ethyl acetate and light transmittance in acetone and cycloexane. The best quantities of modificator is 0.4%, which is confirmed by testing the height of sedimentation in ethyl acetate. SEM and IR were used to characterize the particles. The result suggests that there are an chemical band between CuSCN and C₆H₁₄O₆.Nano-compound emulsion was prepared by adding modified nano-CuSCN into acrylic emulsion, and the properties of the compound emulsion were initially researched. The content of particles, conversion of monomers, residues percent and viscosity was measured to educe the best material proportion. The ratio of SDS and OP is 2:1, the quantities is 4%, initiator concentration is 0.6%, and the temperature is 80℃. SEM, IR and DSC were used to characterize the emulsion. Four index-bacteria were choosed to determine the antibacterial capability. The result suggests that the nanoparticles can be dispersed equably in the emulsion, and the nano-compound acrylic emulsion's properties are better than normal emulsion's.