Aminosilane Catalyst for Olefin Polymerization
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Solution Overview
Problem
Current methods for producing olefin polymers with high melt flow rates and stereoregularity are limited by the need for large amounts of hydrogen, which increases costs and reduces reactor productivity, and existing catalysts do not adequately address the challenge of achieving high yield and stereoregularity in direct polymerization processes.
Innovation Solution
A novel alkylaminosilane compound without Si—OR bonds is used as a catalyst component, combined with a solid catalyst component containing magnesium, titanium, a halogen, and an electron donor, to enhance the polymerization process, allowing for higher stereoregularity and yield with reduced hydrogen usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If large amounts of hydrogen are added to increase melt flow rate, then fluidity is improved, but cost increases and reactor productivity decreases
Solution Approach 1:
The invention changes the chemical parameters of the catalyst system by introducing a specific organosilicon compound with Si-OR bonds and controlling the ratio of hydrogen to silane compound. This allows achieving high melt flow rate (MFR) with reduced hydrogen consumption, thereby maintaining reactor productivity while improving fluidity.
Solution Approach 2:
The organosilicon compound acts as an intermediary substance that mediates between the catalyst system and hydrogen. It facilitates the polymerization process and enables high MFR to be achieved with lower hydrogen levels, resolving the contradiction between fluidity improvement and productivity maintenance.
2Manufacturing precision
If conventional catalysts are used to achieve high stereoregularity, then polymer quality is improved, but yield and productivity are insufficient
Solution Approach 1:
The invention uses a composite catalyst system combining magnesium compound, titanium compound, and a specific organosilicon compound with Si-OR bonds. This composite approach enables simultaneous achievement of high stereoregularity and high polymer yield, overcoming the limitations of conventional single-component catalyst systems.
Solution Approach 2:
By changing the chemical composition parameters of the catalyst system and optimizing the ratio of hydrogen to silane compound, the invention achieves both high stereoregularity and high productivity. The specific organosilicon compound modifies the catalytic activity and selectivity to produce high-quality polymer with improved yield.
3Reliability
If existing catalyst methods are used, then certain results are achieved, but continuous improvement is still demanded for high yield and stereoregularity
Solution Approach 1:
The invention introduces a specific organosilicon compound with Si-OR bonds and optimizes the hydrogen-to-silane compound ratio as key parameters. This enables the catalyst system to maintain high stereoregularity and yield over extended periods, improving both reliability and manufacturing precision simultaneously.
Solution Approach 2:
The organosilicon compound serves as a mediating agent that enhances the catalyst system's ability to maintain stereoregularity and yield. It facilitates sustained catalytic activity and improves the production of high-quality polymer, addressing the need for continuous improvement in both reliability and precision.
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 new catalyst system achieves higher stereoregularity and yield while reducing the amount of hydrogen required, leading to cost-effective production of olefin polymers with improved properties for applications such as vehicle materials and thermoplastic elastomers.
Implementation Method 1
a catalyst component and a catalyst for polymerization of olefins in which the aminosilane compound is used
Implementation Method 2
A solid catalyst component containing magnesium, titanium, an electron donor compound, and a halogen as essential components used for polymerization of olefins
Data Source
AI summary
A catalyst for polymerization of olefins formed from (A) a solid catalyst component containing magnesium, titanium, halogen, and an electron donor compound, (B) an organoaluminum compound shown by the formula, R6pAlQ3-p, and (C) an aminosilane compound shown by the formula, R3nSi(NR4R5)4-n; and a process for producing a catalyst for polymerization of olefins in the presence of the catalyst are provided. A novel aminosilane compound, a catalyst component for polymerization of olefins having a high catalytic activity, capable of producing polymers with high stereoregularity in a high yield, and exhibiting an excellent hydrogen response, a catalyst, and a process for producing olefin polymers using the catalyst are provided.