Study On The Synthesis Of Pinene Resin Catalyzed By Solid Acid From β-Pinrne

The polymerization of P-pinene respectively catalyzed by immobilization Y-zeolite and solid superacid SO₄^2-/TiO₂ had been studied and the main contents and results were as follows.Firstly, cationic polymerization reaction activity ofβ-pinene was studied, which was catalyzed by the different kinds of carrier supported AlCl₃ made-up solid acid catalyst such as TiO₂,732-macropore sulphonic acid resin, Y zeolite, bentonite as well as actived carbon. The results showed that the catalyst of zeolite-Y supported AlCl₃ had very high-activity. The yield ofβ-pinene resin was 78.0%.Secondly, the effects of the amount of zeolite-Y supported AlCl₃,the select of the carriers and solvent on polymerization reaction was studied. That is, the result showed that the best preparation condition of catalyst was when Y- zeolite supported 3 mmol g-1 AlCl3 and using CCl₄ as solvent the, the yield ofβ-pinene resin was 87.8%, which was best activity for the polymerization reactionThirdly, the relationship of the preparation condition of solid superacid SO₄^2-/TiO₂ catalyst and the polymerization reaction was studied. That is, the effects of the roasting temperature and the sample impregnated with H₂SO₄ solution on the polymerization reaction were discussed. The result showed that the best preparation conditions of catalyst were when roasting temperature was 500℃and the sample was impregnated with 1mol L^-1 H₂SO₄ solution, the yield ofβ-pinene resin was 6.8%Fourthly, the reaction conditions, such as amount of catalyst, reaction temperature and reaction time were optimized respectively.The results were as follows: When the ratio of solid superacid SO₄^2-/TiO₂ catalyst to raw material was 30%( mass percent) and the reaction was maintained to 20℃for 4h, the effect of polymerization ofβ-pinene was better, the yield of P-pinene resin was 24.6%. When the ratio of AlCl₃/Y-zeolite catalyst to raw material was 4 %(mass percent) and the reaction was maintained to 0℃for 4h, the effect of polymerization ofβ-pinene was better, the yield ofβ-pinene resin was 86.7%.Fifthly, the effect of reuse of solid superacid SO₄^2-/TiO₂ catalyst and AlCl₃/Y- zeolite catalyst on polymerization reaction was studied. The results were as follows: when the solid superacid SO₄^2-/TiO₂ catalyst was used for many times continuously, it was incapable of reuse. Although the AlCl₃/Y- zeolite catalyst was used for many times continuously, the yield ofβ-pinene resin dropped down markedly.