Tetrahydronaphthol-phosphine pre-transition metal complex, and preparation method therefor and use thereof

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Solution Overview

Problem

Existing olefin polymerization catalysts fail to maintain high catalytic activity and polymerization performance at high temperatures, limiting the development of high-end polyolefins.

Innovation Solution

A tetrahydronaphthol-phosphine pre-transition metal complex is developed, which exhibits good thermal stability and maintains desirable olefin polymerization activity at higher temperatures, producing olefins with high molecular weight and narrow molecular weight distribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If existing olefin polymerization catalysts are used at high temperature, then polymerization speed increases, but catalytic activity and polymerization performance deteriorate

Engineering Contradiction:

Improvepolymerization temperatureVSAvoidcatalytic activity

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent modifies the chemical structure of the catalyst ligand by introducing specific substituents (such as -NR2, -OR, -SR groups) at defined positions on the naphthyl ring. This structural parameter change enhances the catalyst's thermal stability and electronic properties, enabling it to maintain high catalytic activity at elevated temperatures (80-120°C) where conventional catalysts fail

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The catalyst employs a composite ligand structure combining tetrahydronaphthol-phosphine with specific aromatic substituents. This composite molecular architecture synergistically combines thermal stability from the naphthyl core with electronic modulation from the substituent groups, creating a catalyst that performs reliably at high temperatures

Inventive Principle:

Principle #40Composite materials

2Productivity

If polymerization temperature is increased to improve productivity, then polymerization speed increases, but polymer molecular weight decreases

Engineering Contradiction:

Improvepolymerization speedVSAvoidpolymer molecular weight

Core Design Contradiction:

ProductivityVSWeight of moving object

Solution Approach 1:

The patent optimizes the catalyst's ligand structure with specific substituents that create an electronic environment favoring chain growth over chain termination. This parameter change in the catalyst's electronic structure allows the reaction to proceed rapidly at high temperature while maintaining high molecular weight polymers, decoupling the usual trade-off between productivity and molecular weight

Inventive Principle:

Principle #35Parameter changes

3Productivity

If conventional catalysts are used to achieve high polymerization activity, then production efficiency increases, but thermal stability deteriorates

Engineering Contradiction:

Improvepolymerization activityVSAvoidthermal stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent introduces specific substituent groups (-NR2, -OR, -SR) at defined positions on the naphthyl ring, which fundamentally changes the catalyst's thermal stability parameter. These substituents provide steric protection and electronic stabilization to the metal center, preventing catalyst decomposition at high temperatures while preserving or enhancing polymerization activity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a catalyst designed for high-temperature operation where the catalyst structure itself is optimized to withstand thermal stress. Rather than using expensive stabilization additives or operating at low temperatures, the catalyst is inherently designed with thermal resilience through its molecular structure, allowing it to function as a durable active component at elevated temperatures

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 tetrahydronaphthol-phosphine pre-transition metal complex achieves effective olefin polymerization at elevated temperatures, resulting in polymers with high molecular weight and improved properties.

Implementation Method 1

Metal complexes are currently the most commonly used olefin polymerization catalysts

Methodology Applied

Scientific EffectCoordination chemistry:

Implementation Method 2

The tetrahydronaphthol-phosphine pre-transition metal complex has good thermal stability

Methodology Applied

Scientific EffectThermal stability:

Data Source

PatentEP4707283A1Tetrahydronaphthol-phosphine pre-transition metal complex, and preparation method therefor and use thereof

Publication Date: 2026.03.11 CHINA PETROLEUM & CHEMICAL CORP

AI summary

The present invention relates to the technical field of olefin polymerization catalysts. Disclosed are a tetrahydronaphthol-phosphine pre-transition metal complex, and a preparation method therefor and a use thereof. The structural formula of the tetrahydronaphthol-phosphine pre-transition metal complex is shown as formula (I), wherein M is selected from group IVB metals; Ar is selected from substituted or unsubstituted C6-C20 aryl groups; X is selected from halogen or C1-C10 hydrocarbyl groups, and n is 1 or 2. When the tetrahydronaphthol-phosphine pre-transition metal complex of the present invention is used as a main catalyst of an olefin polymerization catalyst, good olefin polymerization activity (homopolymerization/copolymerization activity) is achieved at a relatively high temperature, and the prepared olefin polymer has good performance.