Polyethylene catalyst carrier material with ultrahigh molecular weight and preparation method thereof

Abstract

The invention provides a polyethylene catalyst carrier material with an ultrahigh molecular weight and a preparation method thereof. The preparation method comprises the following steps: mixing a graphene oxide aqueous solution with a silica sol to obtain a mixed dispersion solution; spraying the mixed dispersion solution into liquid nitrogen, performing atomization, then curing instantly, volatizing to remove the liquid nitrogen, and performing vacuum drying to remove water so as to obtain a sample; heating the sample to perform activation reaction, thereby obtaining a graphene oxide/silicon dioxide spherical catalyst carrier material; mixing the graphene oxide/silicon dioxide spherical catalyst carrier material with butyl magnesium chloride in a tetrahydrofuran solution, and stirring for reaction to obtain a reaction product; and cleaning the reaction product, and heating at 600 DEG C for 2 hours to obtain the polyethylene catalyst carrier material with the ultrahigh molecular weight. The catalyst carrier provided by the invention can effectively reduce entanglement of polymer molecular chains, so that a graphene/ultrahigh-molecular-weight polyethylene composite material can be prepared.

Description

technical field [0001] The invention relates to an ultra-high molecular weight polyethylene catalyst carrier material and a preparation method thereof, belonging to the technical field of catalysts. Background technique [0002] Ultra-high molecular weight polyethylene (English name ultra-high molecular weight polyethylene, referred to as UHMWPE) is polyethylene with a molecular weight of more than 1.5 million. Compared with ordinary engineering plastics, UHMWPE has advantages that general materials do not have due to its ultra-high molecular weight (Kwideok Park, Gladius Lewis, Joon B. Park, et al.UHMWPE[J].Encyclopedia of Biomaterials and Biomedical Engineering .2012(4):2925-2934). However, the mechanical properties of polymers are strongly dependent on their molecular characteristics, and while increasing the molecular weight of a polymer, its processability is also adversely affected, mainly due to the reduction in the number of chain terminations that each chain has wi...

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Problems solved by technology

And since graphene is a planar film composed of carbon atoms with sp2 hybrid orbitals to form a hexagonal honeycomb lattice, it is a two-dimensional material with a thickness of only one carbon atom, so it has a thickness of 2630m 2 / g super large theoretical specific surface area (Novoselov KS, Geim AK, Morozov SV, Jiang D, Zhang Y, Dubonos SV, et al.Electric Field Effect in Atomically Thin Carbon Films.Science.2004; 306(5696):666-669 .), and the distribution of functional groups is relatively neat, but because the oxygen-containing functional groups abundant on the surface of graphene oxide sheets are too close to each other, it is easy to cause molecular chain entanglement during the initial growth process of polymerization.

[0007] The literatures that have been reported so far all use graphene sheets without specific morphology and active centers for loading, and then prepare graphene / polyolefin composite materials through polymerization. Although such materials can improve the performance of polyolefin materials, but due to the graphene The distribution between sheets is relatively random, which is easy to cause agglomeration, and the polymer chains grown between different sheets during polymerization cannot prevent the phenomenon of a large number of molecular chains being entangled due to their different growth directions.

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