Process development for metal soaps

摘要: Zinc stearate (ZnSt2) is an important compound among the metallic soaps. It has many applications e.g., in resins, paints, cosmetics, textile, lubricants and LangmuirBlodgett films. Double decomposition (precipitation) fusion processes are widely used techniques ZnSt2 production. The product purity been a major concern most of such as PVC stabilization, coating textile goods, additive cosmetic products. In this study, production using precipitation, modified was investigated based on purity. Raw materials were characterized by various techniques. precipitation process, order to maximize solubility sodium minimize water evaporation, reaction carried out at 70°C. 2.5% (w) NaSt temperature. equivalent, excess Zn deficient cases studied determine raw ratio Equivalent produced highest From washing experiment, it seen that Na2SO4 adsorption did not take place wet ZnSt2. zinc found be 40 dm/kg for effective removal products unreacted room Any further increase amount bring any significant results. drying 100°C, determined 85% water. IR spectra, characteristic peak observed 1540 cm. obtained process contain free Na SO4 ions indicated ICP, EDX elemental analysis Only two peaks 2 values 6.40 19.58 XRD pattern dried due low crystallinity. SEM micrographs, lamellar structure particle size changes between 2-4 m. Melting point about 122°C optic microscopy with temperature controlled hot stage. 140°C equivalent amounts different stirring rates 400, 600 750 rpm. mixing rate decreased delay time occurring beginning reaction. conversion 80% developed method from spectra. comparison experimental data shrinking core model no relation established. cm 1700 which belong COO stretching stearic acid C=O vibrations, respectively. All product, means crystallinity high. form layered lamella change 4-6 melting samples slightly lower than temperature-controlled hotstage. 80°C 1 h. oxide presence H2O. Sodium 1.5% added into mixture surfactant its effect examined. At end spectra does significantly reactants dispersion. spectras patterns. This result confirmed micrographs too. TGA analysis, thermal 250°C. use n-paraffin wax shifted 10°C. Increasing nparaffin increased wax. According results pure should preferred spite high wash consumption. needs decrease time.