Alkoxy Magnesium Supported Olefin Polymerization Catalyst Component
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Solution Overview
Problem
Current olefin polymerization catalysts face challenges in achieving high isotacticity and wide molecular weight distribution without using external electron donors, particularly when using 1,3-diether compounds as internal electron donors, which often result in narrow molecular mass distribution and require additional silane donors for improved polymer properties.
Innovation Solution
An alkoxymagnesium supported olefin polymerization catalyst component is developed, comprising specific alkoxymagnesium, titanium, and ortho-phenylene diester and diether compounds, which eliminates the need for external electron donors by optimizing the molar ratio and using high-pressure treated magnesium alkoxide carriers to enhance catalyst activity and polymer properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 1,3-diether compounds are used as internal electron donors, then catalyst activity is improved, but molecular weight distribution becomes narrow
Solution Approach 1:
The patent combines ortho-phenylene diester and 1,3-diether compounds as a dual electron donor system within the catalyst component. This merging of two different electron donor types allows the catalyst to achieve both high activity (from the 1,3-diether) and wide molecular weight distribution (from the ortho-phenylene diester), resolving the contradiction between these two properties.
Solution Approach 2:
The catalyst component uses a composite structure combining magnesium alkoxide carrier with both ortho-phenylene diester and 1,3-diether compounds. This composite electron donor system leverages the complementary effects of different donor types to simultaneously improve catalyst activity and broaden molecular weight distribution without requiring external electron donors.
2Reliability
If traditional catalysts are used, then external electron donors are required, but device complexity increases
Solution Approach 1:
The catalyst component is designed to be self-sufficient by incorporating both ortho-phenylene diester and 1,3-diether compounds as internal electron donors within the catalyst structure itself. This eliminates the need for separate external electron donor additions during polymerization, simplifying the overall process while maintaining high polymer isotacticity through the optimized internal donor system.
3Productivity
If magnesium dialkoxide is used as carrier, then catalyst activity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes specific parameters in the preparation of magnesium dialkoxide carrier, including using high-pressure treatment and controlling the molar ratios of reactants. By optimizing these parameters, the manufacturing process achieves better control over carrier properties (particle size, morphology, surface area) which enhances catalyst activity while maintaining reasonable manufacturing complexity through systematic parameter control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The catalyst achieves ultrahigh polymerization activity with high isotacticity and wide molecular weight distribution, maintaining activity over extended polymerization times and reducing ash content in polyolefins, outperforming traditional catalysts and methods.
Implementation Method 1
an alkoxymagnesium supported olefin polymerization catalyst component, which comprises reaction products of: 1) an alkoxymagnesium compound... 2) at least one titanium compound... 3) at least one electron donor a compound and at least one electron donor b compound
Data Source
AI summary
Provided is an alkoxy magnesium supported olefin polymerization catalyst component, comprising the reaction products of the following components: at least one alkoxy magnesium compound of Mg(OR1′)N(OR2′)2-N, at least one titanium compound of general formula Ti(OR)nX4-n, at least one ortho-phenylene diester electron donor compound a, and at least one diether electron donor compound b, wherein the molar ratio of a to b is 0.05 to 20. The catalyst component has an ultrahigh polymerization activity when used for olefin polymerization, and does not require the use of an external electron donor, but can also obtain a polymer with a high isotacticity, and the resulting polymer has a relatively wide molecular weight distribution and a relatively low ash content.