以MgCl2/2-乙基己醇/TiCl4 体系合成用于乙烯聚合的球形Ziegler-Natta催化剂，在合成催化剂过程中加入复合内给电子体:乙酸正己酯/邻酞酸二异丁酯，与分别加入四乙氧基硅烷、乙酸乙酯和邻酞酸二异丁酯内给电子体的催化剂进行对比。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和差示扫描量热仪(DSC)等手段对含不同内给电子体的催化剂和聚合物进行分析，并通过乙烯聚合对催化剂催化性能进行评价。结果表明，在温度为80℃，压力0。5 MPa，时间2h的条件下，含复合内给电子体乙酸正己酯/邻酞酸二异丁酯的催化剂催化乙烯聚合活性比其它单一内给电子体的催化剂催化活性要高，催化活性为1。24×105 g PE/(molTi·h)。
Effect of compound internal electron donor ID on the catalytic performance of ethylene polymerization in MgCl2/2-ethylhexanol/TiCl4 catalytic system
MgCl2/2-Ethylhexanol/TiCl4 system was used to synthesize spherical Ziegler-Natta catalyst for ethylene polymerization,and the composite internal electron donor was added in the synthesis process:n-hexyl acetate/diisobutyl phthalate was compared with tetraethoxysilane,ethyl acetate and diisobutyl phthalate as electron donors,respectively.The catalysts and polymers containing different internal electron donors were analyzed by means of X-ray diffraction(XRD),scanning electron microscopy(SEM)and dif-ferential scanning calorimetry(DSC),and the catalytic performance of the catalysts was evaluated by eth-ylene polymerization.The results showed that under the conditions of temperature 80℃,pressure 0.5 MPa and time 2 h,the catalytic activity of the catalyst containing complex internal electron donor n-hexyl acetate/diisobutyl phthalate was higher than that of other single internal electron donor catalysts,and the catalytic activity was 1.24×105 g PE/(molTi·h).
compound internal electron donorpolymerization reactionpolyethyleneZiegler-Natta cata-lyst
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