Preparation Of Nano-pigment In Latex

The preparation of nano-pigrnents and their application in emulsion coatings were studiedin this paper, nanocrystaUine iron oxide were prepared by colloidal chemical methodcombining with ultrasonic technology. XRD and TEM were used to identity theproducts. the optimum conditions such as the temperature of reaction, pH value of solution,the best kind of surfactant and extractant as well as their optimum content were obtainedby single factor experiment.α-FeOOH with good dispersing property and small diameterwere prepared. Its average diameter was about 12nm. Theα-FeOOH is changed intoα-Fe₂O₃ with the average major axial diameter of 50nm and the minor of 10nm bycalciming at 450℃. nanosized silica dioxide was prepared by the Sol-Gel method withtetraethoxysilane(TEOS). Effects of the pH value of solution and the concentration oftetraethoxysilane(TEOS) etc. on the gelation appearance and gelation time as well as theinfluence of pH value on the diameter of nano-SiO₂ were investigated in this paper, bothXRD and TEM were applied to identity the products, the results show that monodispersedspherical silicon dioxide particles with the average diameter of 80nm were prepared, whenthe pH value of solution is increased, the size of particles increase to some extent, theinfluence on the property of antirust emulsion coating by nano-Fe₂O₃ were also discussedin this paper. The optimum dispersing technology was determined by comparing thecomprehensive property of nano-composite coatings prepared by different dispersingtechnology. The cohesion, hardness, wear property and resistance to NaCl, acid, alkali,water of nano-composite coatings were estimated by relevant assessment methods, theResults show that the property of nano-composite coating changed with different contentof nano-particles, when the content of nano-Fe₂O₃ is about 3%, the comprehensiveproperties of nano-composite is optimum, the nano-SiO₂ and nano-TiO₂ were also appliedto the antirust emulsion coating. The results show that the property of coatings wereimproved by the proper content of nano-partieles.. The preferred filling ratio ofnano-particle were also obtained.