| abstract |
The invention relates to a FI catalyst for preparing low-entangled high molecular weight polyethylene, a preparation method and application thereof, and a phenol derivative, paraformaldehyde, an inorganic catalyst and triethylamine are added to a reaction bottle, and an organic solvent is added. Heating the reflux reaction to obtain a salicylaldehyde derivative; then adding a salicylaldehyde derivative and a substituted primary amine to the reaction flask, adding an organic solvent, performing an aldehyde amine condensation dehydration reaction, and purifying the reaction to obtain a phenoxy An amine ligand; the phenoxyimine ligand is first reacted with an alkyl lithium, and then complexed with a metal chloride, filtered, concentrated, and crystallized to obtain the FI catalyst. Compared with the prior art, the present invention can obtain a high molecular weight polyethylene having a molecular weight of 200,000-8,800, and a crystallinity of 60% to 70% when used for catalyzing ethylene polymerization. |