复合型内给电子体ID对MgCl_(2)/2-乙基己醇/TiCl_(4)催化体系催化乙烯聚合性能的影响

Effect of compound internal electron donor ID on the catalytic performance of ethylene polymerization in MgCl_(2)/2-ethylhexanol/TiCl_(4)catalytic system

以MgCl_(2)/2-乙基己醇/TiCl_(4)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2 h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1.24×10^(5)g PE/(mol_(Ti)·h)。

MgCl_(2)/2-Ethylhexanol/TiCl_(4system)was used to synthesize spherical Ziegler-Natta catalyst for ethylene polymerization,and the composite internal electron donor was added in the synthesis process:nhexyl 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 differential scanning calorimetry(DSC),and the catalytic performance of the catalysts was evaluated by ethylene polymerization.The results showed that under the conditions of temperature 80℃,pressure0.5 MPa and time 2 h,the catalytic activity of the catalyst containing complex internal electron donornhexyl acetate/diisobutyl phthalate was higher than that of other single internal electron donor catalysts,and the catalytic activity was 1.24×10^(5)g PE/(mol_(Ti)·h).