Abstract The nucleation agent DMDBS was synthesized by aqueous precipitation and the optimization of the process was studied.Sorbitol and 3,4-dimethylbenzaldehyde were condensed in aqueous H2SO4 in presence of the emulsifier OP-10.Factors such as the sulfuric acid concentration，molar ratio of aldehyde to alcohol,reaction temperature and reaction time，were investigated；and the preferred preparation conditions were reaction temperature 15 ℃，reaction time 10 h，the sulfuric acid concentration 45%，molar ratio of aldehyde to alcohol 1.5∶1.0.The crude product was refined with N,N-dimethyl-n-octadecylamine and acetone.Under this condition，the DMDBS was obtained with the yield of 75.56%，purity above 99%，melting point of 252—253 ℃，giving the product with quality of a high level.
DUAN Yuan-Chao, SONG Jian, PANG Xiao-Min, SUN Shu-Juan, FENG Rong-Xiu.Synthesis of Polypropylene Nucleation Agent DMDBS[J] Chemcial Industry and Engineering, 2012,V29(01): 30-33
2012, Vol. 29 
