Study On The Synthesis Of Ester-tin Stabilizer

Ester-tin is a kind of organo-tin heat stabilizer which has high effects and low poison. It's used as PVC heat stabilizer, and has a bright future. Its application and development prospects. In order to stimulate its use and development of ester tin heat stabilizer in china, and further more replace or reduce the use of heat stabilizer such as Cadmium salt, lead salt, It's very important to simplify its manufacture process and reduce its manufacture cost. In this article, the industrial process of ester-tin heat stabilizer di(β-butoxy carbonyl-ethyl) tin bis(isooctyl mercaptoacetate) and its intermediates isooctyl mercaptoacetate and bis(β-butoxy carbonyl-ethyl) tin dihalides are studied by means of orthogonal design.In this paper, a new process of isooctyl mercaptoacetate synthesis, which uses 80% sulfuric acid as catalyst, industrial Isooctyl chloroacetate was synthesized from chloroacetic acid and 2-ethylhexanol, via sulfhydrylation, acidolysis and reduction reaction,converted into isooctyl mercaptoacetate. Many factors, which concerned with the reaction such as the molar ratio of raw materials, and the type of catalyst, and the quantity of the catalyst, and the solvents with water, and reaction temperature, and reaction time are studied. The results showed that the optimum technological conditions should be that, and the main factor affecting the reaction is found. The product was characterized by IR and GC.Bis(β-butoxy carbonyl-ethyl) tin dihalides is the other important intermediate for ester-tin synthesis. the process by water solvent, intermediate was synthesized using Sn powder and Butyl acrylate and Hydrochloric acid as raw materials is put forward. Many factors affecting reaction such as the ratio of raw materials, the added speed of Hydrochloric acid, and the reaction temperature and the reaction time are researched. The chief factor is found out and the optimistic process is determined. The product was characterized by IR, elementary analysis and tin content analysis. The process compared with other process has good advantage, such as the synthesis is easy, the raw material is easy to obtain, high purity of the intermediate and the reaction can be carried out at ordinary temperature and pressure.In addition, the intermediate reacted with the isooctyl mercaptoacetate, at last the di(β-butoxy carbonyl-ethyl) tin bis(isooctyl mercaptoacetate) was come into being. Many factors affecting reaction such as the ratio of raw materials, the Concentration of Sodium carbonate, reaction temperature, reaction time are researched, and the optimistic scheme is determined. The product was characterized by IR, elementary analysis and tin content analysis. Then the heat stability is tested according to national standard GB/T 2917.1-2002, and the satisfy result is obtained.