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Preparation of Petroleum Resin by Catalytic Polymerization

author£ºadmin Date£º2017/2/6 17:17:07
At present, a high-grade C5 petroleum resin or a petroleum resin of the meta-pentadiene is subjected to catalytic polymerization using a catalyst, and the polymerization reaction.
The softening point of the obtained petroleum resin is moderate and the hue is light. The polymerization process of the resin is mainly the addition polymerization of the polymerization monomer under the action of the catalyst cation. As the monomer of the pentadiene and isoprene in the role of the catalyst to form cationic active center, and then lead to chain reaction to form petroleum resin. There are two types of catalysts for protonic acid, Lewis acids and protonic acids. However, because of the low softening point and deep hue of the resin, the synthetic resin is often used as a catalyst. Polymerization of petroleum resin usually uses aluminum trichloride or boron trifluoride, while the polymerization of C5 petroleum resin or piperylene petroleum resin uses solid aluminum trichloride as the catalyst, and the resin has the highest softening point. By Brnsted acid, Lewis acid or halide, etc. initiated by cationic polymerization process, the catalyst used sulfuric acid, hydrochloric acid, phosphoric acid, aluminum trichloride, boron trifluoride, zinc chloride and so on. The advantage of this method is that the polymerization temperature is low (usually 10-60 degrees Celsius). The shortcomings of the act is the high cost of the equipment, severe corrosion, resulting in complex wastewater treatment, petroleum products, such as deep-colored resin. At present, most of the domestic industrial production equipment is used in the improved process line, and the traditional catalytic polymerization method is the same with A1Cl3, BF3O (C2H5) 2 (boron trifluoride ether compound) as the catalyst, the difference is the traditional catalytic polymerization method using alkali washing and washing to terminate the reaction and the removal of the catalyst, washing not only the existence of serious emulsification problems, but also the existence of the catalyst is difficult to remove and wastewater pollution problems, if the catalyst removal is not clean, will lead to resin performance is poor, and affect the entire post-processing process. Although phosphite ester such as trimethyl phosphite, triethyl phosphite and triphenyl phosphite are used as reaction terminating agents after completion of the polymerization and a new and improved method such as a filtration method and a water washing method are used to solve the problem Pollution of the environment and can improve product quality. But has few real examples of industrial applications.