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首页> 外文期刊>Journal of Applied Polymer Science >Supported SiO2-(BuSnCl3)-Bu-n/MAO/((BuCp)-Bu-n)(2)ZrCl2 catalyzing MAO cocatalyst-free ethylene polymerization: Study of hydrogen responsiveness
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Supported SiO2-(BuSnCl3)-Bu-n/MAO/((BuCp)-Bu-n)(2)ZrCl2 catalyzing MAO cocatalyst-free ethylene polymerization: Study of hydrogen responsiveness

机译：负载的SiO2-（BuSnCl3）-Bu-n / MAO /（（（BuCp）-Bu-n）（2）ZrCl2催化无MAO助催化剂的乙烯聚合：氢响应性的研究

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摘要

A supported metallocene catalyst was synthesized by sequentially loading methylaluminoxane (MAO) (30 wt % in toluene) and ((BuCp)-Bu-n)(2)ZrCl2 on partially dehydroxylated silica ES 70 modified by (BuSnCl3)-Bu-n. Its shock load hydrogen responsiveness was evaluated by polymerizing ethylene for I h at 8.5 bar (g) and 75 degrees C without separately feeding the MAO cocatalyst. The shock load hydrogen feeding increased the ethylene consumption (at a fairly constant rate), catalyst productivity, as well as the resin bulk density and average particle size at Delta P (of hydrogen) >=similar to 3.0 psi. The bulk density increased from 0.25 to 0.31 g/cm(3). This shows a procedure for overcoming the inherent drop in catalyst productivity caused by heterogenization. of metallocenes (that is a method for catalyst activation) and improving the resulting resin bulk density. The volume-weighted
机译：通过依次将甲基铝氧烷（MAO）（在甲苯中占30 wt％）和（（BuCp）-Bu-n）（2）ZrCl2负载在经（BuSnCl3）-Bu-n改性的部分脱羟基二氧化硅ES 70上来合成负载型茂金属催化剂。通过在不单独进料MAO助催化剂的情况下，在8.5 bar（g）和75摄氏度下将乙烯聚合1 h来评估其冲击负荷氢响应性。冲击负荷氢气进料增加了乙烯消耗（以相当恒定的速率），催化剂生产率，以及在ΔP（氢的）≥约3.0psi时的树脂堆积密度和平均粒度。堆积密度从0.25增加到0.31 g / cm（3）。这显示了克服由异质化引起的催化剂生产率的固有下降的方法。茂金属（这是用于催化剂活化的方法）并改善所得树脂的堆积密度。体积加权

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