The Synthsis Of Butyl-Rubber On TiCl₄Catalyst System

This thesis parameters using the TiCl4catalyst system preparation of butyl rubber, the polymerization and the copolymerization of isobutylene and isoprene two aspects are discussed separately. This thesis studied the influence on polymerization method, the catalyst concentration, reaction temperature, reaction time, the catalyst is added to the way affect the synthesis of the butyl rubber, as well as the influence of the structure of the product on the terminating agent, and the activity of catalyst on the initial concentration of the catalyst, and the influence on isoprene content. In addition, the paper also test the performance of the synthesis of butyl rubber and contrast with commercial butyl-rubber.The results showed that:by TiCl4catalyst system, we can effectively synthetic butyl rubber. The slurry polymerization significantly improved than the effect of bulk polymerization, the optimum concentration of the monomers is2.4mol/L. Reducing the temperature and increasing the catalyst concentration can increase its production rate. But if the catalyst concentration was too high, the catalyst efficiency would be reduced; if the temperature was too low, the solvent would be solidified. Time had almost no effect on the reaction yield. The optimum reaction catalyst concentration is [Ti]=1.9×10-2mol/L, the optimal reaction temperature is-85℃, the reaction time is5minutes. At the end of the reaction, it should be terminated by the terminating agent. Otherwise, it would generate a large quantity of double bond because of the chain transfer reaction. This will affect the butyl rubber double bonds observation of hydrogen generated and calculation of the degree of unsaturation. With the catalyst added dropwise, it is possible to effectively increase the area of contact of the catalyst solution and the monomer solution, to improve the yield of the butyl rubber. The initial concentration of the catalyst solution could affect the activity of the catalyst.If the initial concentration is too high, it was easy to make produce coated, and the error is large; if the initial concentration is too tow, the catalyst activity decreases. Therefore, the initial concentration of the catalyst is generally used0.091mol/L.Using the TiCl4catalyst system synthesis of butyl rubber, compared with the traditional method, production process had improvement. The reaction temperature is-85℃to reduce energy consumption. With narrow molecular weight distribution, experimental production of butyl rubber make up for the defects of molecular weight reduction in performance to a certain extent. Seen from the Mooney viscosity, the present experimental production of a butyl rubber is superior to the finished gum. Judging from the processing properties, the production of butyl rubber in the present experiment was slightly lower than the finished rubber, but to a certain extent can be replaced finished butyl rubber.