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首页> 外文期刊>Journal of Applied Polymer Science >Polymerization of propylene using the high-activity Ziegler-Natta catalyst system SiO2/MgCl2 (ethoxide type)TiCl4/Di-n-butyl phthalate/triethylaluminum/dimethoxy methyl cyclohexyl silane
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Polymerization of propylene using the high-activity Ziegler-Natta catalyst system SiO2/MgCl2 (ethoxide type)TiCl4/Di-n-butyl phthalate/triethylaluminum/dimethoxy methyl cyclohexyl silane

机译：使用高活性Ziegler-Natta催化剂体系SiO2 / MgCl2（乙醇型）TiCl4 /邻苯二甲酸二正丁酯/三乙基铝/二甲氧基甲基环己基硅烷进行丙烯聚合

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The bisupported Ziegler-Natta catalyst system SiO2/MgCl2 (ethoxide type) /TiCl4/di-n-butyl phthalate/ triethylaluminum (TEA)/dimethoxy methyl cyclohexyl silane (DMMCHS) was prepared. TEA and di-n-butyl phthalate were used as a cocatalyst and an internal donor, respectively. DMMCHS was used as an external donor. The slurry polymerization of propylene was studied with the catalyst system in n-heptane from 45 to 70degreesC. The effects of the TEA and H, concentrations, temperature, and monomer pressure on the polymerization were investigated. The optimum productivity was obtained at [Al] / [DMMCHS] / [Ti] = 61.7:6.2:1 (mol/mol/mol). The highest activity of the catalyst was obtained at 60degreesC. Increasing the H-2 concentration to 100 mL/L increased the productivity of the catalyst, but a further increase in H-2 reduced the activity of the catalyst. Increasing the propylene pressure from I to 7 bar significantly increased the polymer yield. The isotacticity index (II) decreased with increasing TEA, but the H-2 concentration, temperature, and monomer pressure did not have a significant effect on the II value. The viscosity-average molecular weight decreased with increasing temperature and with the addition of H-2. Three catalysts with different Mg/Si molar ratios were studied under the optimum conditions. The catalyst with a Mg/Si molar ratio of approximately 0.93 showed the highest activity. (C) 2003 Wiley Periodicals, Inc. [References: 34]
机译：制备了双载体齐格勒-纳塔催化剂体系SiO2 / MgCl2（乙醇型）/ TiCl4 /邻苯二甲酸二正丁酯/三乙基铝（TEA）/二甲氧基甲基环己基硅烷（DMMCHS）。 TEA和邻苯二甲酸二正丁酯分别用作助催化剂和内部给体。 DMMCHS被用作外部供体。用催化剂体系在正庚烷中于45至70℃下研究丙烯的淤浆聚合。研究了TEA和H，浓度，温度和单体压力对聚合反应的影响。在[Al] / [DMMCHS] / [Ti] = 61.7：6.2：1（mol / mol / mol）时获得了最佳生产率。在60℃下获得催化剂的最高活性。将H-2浓度增加到100 mL / L可以提高催化剂的生产率，但是H-2的进一步增加会降低催化剂的活性。将丙烯压力从1巴增加到7巴显着提高了聚合物产率。全同立构规整度指数（II）随TEA的增加而降低，但是H-2的浓度，温度和单体压力对II值没有显着影响。粘均分子量随温度升高和加入H-2而降低。在最佳条件下研究了三种具有不同Mg / Si摩尔比的催化剂。 Mg / Si摩尔比约为0.93的催化剂显示出最高的活性。 （C）2003 Wiley Periodicals，Inc. [参考：34]

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