烷基铝对球形MgCl_2负载的茂金属催化剂催化乙烯聚合的影响

THE EFFECT OF ALKYLALUMINUM ON SPHERICAL MgCl_2 SUPPORTED METALLOCENE CATALYST FOR ETHYLENE POLYMERIZATION

Spherical MgCl 2 supported metallocene catalyst was prepared by supporting MAO on carrier which was prepared from MgCl 2 ·n EtOH.Ethylene polymerization was carried out by addition of MAO/MgCl 2,different metallocenes and alkylaluminum,in the absence of soluble MAO.It shows high activity for ethylene polymerization at lower Al/Zr(Al/Zr=45).The effect of concentration of Al( i Bu) 3 on polymerization activities and activation of Et(Ind) 2ZrCl 2 were studied.Kinetic behavior of ethylene polymerization on spherical MgCl 2 supported metallocene catalyst was investigated,which indicated the polymers obtained by reaction could affect the diffusion of ethylene in hexane under the experiment condidtion.Different aluminium alkyls have great impact on the whole polymerization behavior,and the relative reactivity decreases in the following order:Al( i Bu) 3>AlEt 3>AlMe 3>AlEt 2Cl,in which Al( i Bu) 3 shows the highest catalytic activity (5 78×10 7 g PE/mol\|Zr·h).

Spherical MgCl2 supported metallocene catalyst was prepared by supporting MAO on carrier which was prepared from MgCl2 . n EtOH. Ethylene polymerization was carried out by addition of MAO/MgCl2, different metallocenes and alkylaluminum, in the absence of soluble MAO. It shows high activity for ethylene polymerization at lower AI/Zr(AI/Zr = 45). The effect of concentration of Al (i-Bu), on polymerization activities and activation of Et(Ind)(2)ZrCl2 were studied. Kinetic behavior of ethylene polymerization on spherical MgCl2 supported metallocene catalyst was investigated, which indicated the polymers obtained by reaction could affect the diffusion of ethylene in hexane under the experiment condidtion. Different aluminium alkyls have great impact on the whole polymerization behavior, and the relative reactivity decreases in the following order: Al(i-Bu), > AlEt3 > AlMe3 > AlEt2 Cl, in which Al( i-Bu)(3) shows the highest catalytic activity (5.78 x 10(7) g PE/mol-Zr .h).