Ultrahigh-molecular-weight polyethylene catalyst as well as preparation method and application thereof

Abstract

The invention relates to an ultrahigh-molecular-weight polyethylene catalyst and a preparation method and application thereof. The catalyst comprises an active component, a carrier and an internal electron donor, wherein the active component is a transition metal catalyst, the carrier is fabric-shaped porous molecular sieve fiber, a molar ratio of the internal electron donor to the active component is (0.01-100): 1, and a weight ratio of the carrier to the active component is (0.01-100): 1. Compared with the prior art, the ultrahigh-molecular-weight polyethylene catalyst has larger specific surface area and higher strength; and ultrahigh-molecular-weight polyethylene catalytically synthesized by adopting the catalyst is wide in molecular weight distribution, low in entanglement degree, fine in particle and high in mechanical property.

Description

technical field [0001] The invention belongs to the technical field of ultra-high molecular weight polyethylene synthesis, and relates to an ultra-high molecular weight polyethylene catalyst and its preparation method and application. Background technique [0002] UHMWPE is a thermoplastic engineering material with multiple advantages, with an average molecular weight of about 1.5 million. Due to its high molecular weight, it has many excellent properties, such as impact resistance, hygiene and non-toxicity, abrasion resistance, tensile resistance, low density, low temperature resistance, non-absorbent, etc., and is widely used in textiles, machinery, and chemical industry. , mining, petroleum, agriculture, medical, sports and refrigeration technology and many other fields. Most of the currently disclosed catalysts for the preparation of ultra-high molecular weight polyethylene are based on molecular sieves, and the active substances are loaded on the carrier. Shedding occ...

AI Technical Summary

Problems solved by technology

Most of the currently disclosed catalysts for the preparation of ultra-high molecular weight polyethylene are based on molecular sieves, and the active substances are loaded on the carrier. Shedding occurs on the surface of the molecular sieve, blocking the pores of the molecular sieve, affecting the polymerization activity, and the obtained polymerization product has a low molecular weight, a large particle size, and a serious degree of entanglement, which is not conducive to subsequent processing and application.

[0003] For example: Chinese patent CN108003261A discloses a catalyst used for ethylene polymerization, which is to directly support magnesium salt / titanium salt on the mesoporous molecular sieve material with a one-dimensional straight-through channel structure and the mesoporous molecular sieve material with a hexagonal channel structure, but The catalytic activity of the obtained catalyst is low and the molecular weight of the product is low, and the preparation process of the molecular sieve carrier is relatively complicated

[0004] Chinese patent CN110407966A discloses an ultra-high molecular weight polyethylene catalyst, in which a titanium-containing compound is supported on spherical graphene oxide treated with a surfactant as the main component of the catalyst, and the prepared polymer has better antistatic performance , but did not improve the mechanical properties and the viscosity average molecular weight is low

[0005] Chinese patent CN107417812A discloses a supported ultra-high molecular weight polyethylene catalyst. During the preparation, molecular sieves of three structures need to be mixed and ball-milled. The preparation process is complicated and the degree of entanglement of the polymerization product is relatively serious, which is not conducive to subsequent processing.

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