Zhang, Guoqiang; Zong, Xianqing; Sun, Meiling; Sun, Jie; Li, Xuebo published the artcile< Research and development of synthetic process of brominated SBS>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is synthetic process brominated SBS.
Styrene butadiene rubber SBS-4303 was selected as the reaction raw material, and the volume ratio of dichloromethane and methanol was 3.5% in the reactor In a mixed solvent of 5:1; Tetra-Et ammonium tribromide solid was prepared by adding bromine and tetra-Et ammonium bromide with a mass ratio of bromine: tetra-Et ammonium bromide: styrene butadiene rubber of 8:6:3 into water. Dissolve tetra-Et ammonium tribromide into a mixed solvent prepared by dichloromethane and methanol in proportion; The temperature of the reactor is controlled at 10°C, and the above mixed solution of tetra-Et ammonium tribromide is added to the reactor to slowly react with SBS-4303. After dropping, the heat preservation reaction is completed for 3 h, then tin tetrachloride with 2% mass of styrene butadiene rubber is added for catalytic reaction, and the temperature is slowly raised to 39°C, and the heat preservation reaction is continued for 10 h. After the reaction, add sufficient water into the distillation kettle, add TXP-10 dispersed emulsifier according to 3% of the water mass to completely dissolve it, and raise the temperature of the kettle to 90°C. Slowly add the solution after the reaction to the extraction kettle under stirring. While the product is precipitated during the dropping process, the reaction solvent is evaporated from the kettle at the same time, cooled and recycled. After centrifugation, drying and laboratory test, the precipitated products shall be tested according to 1 Dibutyltin maleate was added in the proportion of 5% to improve the thermal stability of the product. Finally, the product was packaged. Circulation and application of centrifugal liquid
Shandong Huagong published new progress about Bromination. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics