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Method for preparing polyolefin

A polyolefin and polyolefin catalyst technology, applied in the polymer field, can solve the problems of reducing catalyst activity, increasing the types of active sites, etc., and achieve the effects of increasing metal loading, non-toxic and easy to degrade, and shortening impregnation time.

Pending Publication Date: 2021-11-19
SHANGHAI HONGAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the production requirements of industrial gas-phase fluidized beds in the actual use of these catalysts, it is usually necessary to load active metal catalysts on various supports, but the metal catalysts will reduce the activity of the catalyst, and at the same time, the type of active sites will also be changed. increase

Method used

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  • Method for preparing polyolefin
  • Method for preparing polyolefin

Examples

Experimental program
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Embodiment 1

[0024] The steps to prepare alkenes are as follows:

[0025] (1) Preparation of silica gel carrier: 5.0 g of carbon microspheres (10-40 μm in particle size range) are added to 200 ml of hydrochloric acid solution with a molar concentration of 1 mol / L and stirred evenly to obtain a hydrochloric acid solution containing carbon microspheres; under stirring, 1.25 Add 4 g of tetraethyl orthosilicate slowly in the hydrochloric acid solution of carbon-containing microspheres prepared in the preceding steps and continue to stir, then add 25 g of a mass concentration of 40% sodium silicate aqueous solution to obtain a silicon source solution; Add 2.5g template agent F4-PEG600-F4 and stir evenly to prepare hydrated silica gel, then transfer the obtained gel to a microwave reaction tank for thermal aging, microwave reaction at 90°C for 1.5h at a microwave power of 300W ; The resulting product is cooled and filtered, and the resulting solid is washed with ethanol / water to neutrality (test...

Embodiment 2

[0033] The preparation of silica gel carrier and catalyst is the same as in Example 1, and the reference example 1 for the preparation of polyolefin, except that ethylene is replaced by propylene in step (3), and other conditions are the same to obtain ethylene-propylene copolymer; catalyst activity 20.5kgPE / gcat, polymer bulk density 0.39g / cm 3 , the molecular weight distribution Mw / Mn of the polymer is 19, and the polymerization results are shown in Table 1.

Embodiment 3

[0035] The preparation of silica gel carrier and catalyst is the same as in Example 1, and the reference example 1 for the preparation of polyolefin, except that ethylene is replaced by 1-butene in step (3), and other conditions are the same to obtain ethylene-1-butene copolymerization material; catalyst activity 21.3kgPE / gcat, polymer bulk density 0.40g / cm 3 , the molecular weight distribution Mw / Mn of the polymer is 22, and the polymerization results are shown in Table 1.

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Abstract

The invention provides a method for preparing polyolefin. The method comprises the following steps: (1) preparing a silica gel carrier: adding carbon microspheres into an acid solution to prepare an acid solution containing the carbon microspheres, slowly adding organic silicate ester, adding a sodium silicate aqueous solution to prepare a silicon source solution, adding a template agent into the silicon source solution, uniformly stirring, carrying out microwave reaction to prepare silica gel, drying to prepare powder, and removing the template agent; (2) preparing a silica gel loaded polyolefin catalyst: dipping the silica gel carrier into a solution composed of a transition metal salt, an aluminum salt and a boron compound, carrying out ultrasonic oscillation, filtering, and drying to obtain a solid; and (3) preparing polyolefin: activating a catalyst, transferring the activated catalyst into a polymerization reactor, mixing the activated catalyst with a comonomer and a diluent to prepare a premixed solution, and introducing an olefin monomer for reaction. The method for preparing polyolefin provided by the invention not only can improve the production efficiency of polymerization reaction, but also has the advantages of simplicity and convenience in operation, suitability for industrial large-scale production and the like.

Description

technical field [0001] The invention belongs to the technical field of macromolecules, in particular to a method for preparing polyolefins. Background technique [0002] Polyolefin usually refers to a thermoplastic resin prepared by polymerization of olefin monomers. Because of its excellent low temperature resistance, good chemical stability, easy processing, good plasticity, chemical corrosion resistance and low water absorption, etc., The application of polyolefin is very extensive. As the demand for polyolefins increases, the research on catalytic polymerization of olefins has become one of the key core technologies in the polyolefin industry, the most critical of which is the development and utilization of catalysts. Suitable catalysts have a significant impact on realizing the effective conversion of olefin raw materials to products, shortening the polymerization reaction time and technical process, continuously improving the quality and performance of products, and b...

Claims

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Application Information

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IPC IPC(8): C08F210/16C08F210/14C08F4/02C01B33/152C01B33/157C01B33/158
CPCC08F210/16C01B33/152C01B33/157C01B33/158C01B33/1585C08F4/025C08F210/14C08F2500/04C08F2500/18Y02P20/52
Inventor 彭晓琪杜刚丁炎金建耀
Owner SHANGHAI HONGAN CHEM
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