Catalyst for production of ultrahigh molecular weight polyolefin as well as preparation method and application of catalyst

Abstract

The invention relates to a catalyst for production of ultrahigh molecular weight polyolefin as well as a preparation method and an application of the catalyst. The catalyst comprises an inorganic carrier supporting a surfactant and a catalytic component supported on the inorganic carrier, and the catalytic component is a catalytic component MR4 formed through a reaction of transition metal halideMX4 and an organic metal reagent M'Rn (n ranges from 1 to 3) containing an R group. Compared with the prior art, the prepared catalyst is a ultrahigh molecular weight polyethylene product with high bulk density, uniform particles and average particle size smaller than 200 mu m, can be applied to preparation and application of high and medium-density ultrahigh molecular weight polyolefin and is particularly suitable for high-performance ultrahigh molecular weight polyethylene fiber and other products.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for producing ultra-high molecular weight polyolefin and its preparation method and application. Background technique [0002] my country's polyolefin industry has developed rapidly, but it still cannot meet the needs of the domestic market, especially high-performance polyolefin materials mainly rely on imports. The high performance of general-purpose polymer materials such as polyethylene has always been a research hotspot. Olefin polymerization catalyst is the core of polyolefin polymerization technology. The catalytic efficiency of traditional Ziegler-Natta catalyst loaded on the carrier is significantly improved, which is called high-efficiency Ziegler-Natta catalyst, which makes the polyolefin industry develop rapidly. Ultrafine particle polyethylene is widely used. Ultrafine ultrahigh molecular weight polyethylene, ultrafine polyethylene wax, ultrafine high density polyethylene a...

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Problems solved by technology

This patent improves the activation efficiency of silica gel by adding Grignard reagent to modify silica gel, but the active component of the catalyst is still titanium tetrachloride, and the shortcomings of silica gel supported titanium tetrachloride are difficult to overcome, such as low bulk density and product molecular weight distribution. The shortcomings of wide, agglomerated growth in the polymerization of polymerization products, large particle size, and uneven distribution increase the difficulty of post-processing of ultra-high molecular weight polyethylene, resulting in limited product application fields, and it is difficult to use in high-end fields such as spinning and diaphragm fields. use

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