Phosphine-Phenol Metal Complexes for High-Temperature Olefin Catalysis
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Solution Overview
Problem
Existing ethylene polymerization catalysts face challenges in maintaining high polymerization activity at higher temperatures, leading to broad molecular weight distribution in polyolefin resins.
Innovation Solution
A phosphine-phenol late transition metal complex with specific structural formulas, capable of operating at higher temperatures and maintaining high polymerization activity, is developed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing ethylene polymerization catalysts are used at higher temperatures, then polymerization activity is maintained, but molecular weight distribution becomes broader
Solution Approach 1:
The patent modifies the ligand structure by introducing specific substituents (R1-R6 groups) at defined positions on the phenolic rings, changing the electronic and steric parameters of the catalyst complex. This structural parameter change enables the catalyst to maintain high polymerization activity at elevated temperatures while producing polymers with narrower molecular weight distributions, directly resolving the technical contradiction between productivity and manufacturing precision.
2Temperature
If polymerization temperature is increased to 80°C or higher, then process requirements are met, but catalyst activity decreases
Solution Approach 1:
The patent creates a composite ligand structure combining phenolic moieties with specific aromatic substituents (R1-R6 groups) that work synergistically. The phenolic oxygen coordinates with the metal center while the aromatic groups provide steric protection and electronic modulation, creating a composite catalyst system that remains highly active at temperatures of 80°C and above, thus resolving the contradiction between operating temperature and catalyst activity.
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 complex achieves higher ethylene polymerization activity and narrower molecular weight distribution, enhancing the performance of polyolefin resins in various industrial applications.
Implementation Method 1
a phosphine-phenol late transition metal complex and preparation method therefor and use thereof... the phosphine-phenol late transition metal complex has good thermal stability, particularly, the metal complex can still maintain a higher ethylene polymerization activity at a higher temperature
Data Source
AI summary
The present invention relates to the technical field of olefin polymerization catalysts, and discloses a phosphine-phenol late transition metal complex and preparation method therefor and use thereof. The structural formula of the phosphine-phenol late transition metal complex is shown in formula (I), wherein, R1 is selected from substituted or unsubstituted C1-C20 hydrocarbyl, R3 and R4 are each independently selected from halogen, C1-C10 hydrocarbyl, -P(R5)3, -NR6R7 and -OR8R9, wherein R5 is substituted or unsubstituted C1-C10 alkyl or aryl, R6, R7, R8 and R9 are each independently selected from C1-C10 hydrocarbyl, and R6 and R7, as well as R8 and R9, are optionally interconnected to form a five- or six-membered ring. Under similar polymerization conditions, by using the metal complex of the present invention as a catalyst for olefin polymerization, a higher homopolymerization/copolymerization activity can be achieved, and the obtained polymer has an obviously higher molecular weight and a narrower molecular weight distribution.