Organometallic Catalyst for Polyurethane Foam Polymerization

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Solution Overview

Problem

There is a need for a safe and rapid-reacting catalyst for polyurethane polymerization that replaces toxic tin-based materials, as existing polymerization catalysts can be hazardous and slow-reacting.

Innovation Solution

A catalyst compound combining an organic compound and an organometallic compound, where the organometallic compound makes up at least 51% of the mixture, is used, which includes a metal atom with organic ligands and is soluble in the organic compound, allowing for rapid and tunable polymerization of aliphatic isocyanates at room temperature.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If tin-based catalysts are used for polyurethane polymerization, then catalytic activity is achieved, but toxicity increases and safety decreases

Engineering Contradiction:

Improvecatalytic activityVSAvoidtoxicity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts the harmful tin-based catalyst from the system and replaces it with a combination of organic initiators and organometallic compounds with terminal free radicals, eliminating toxicity while maintaining catalytic function

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention uses organic initiators and organometallic compounds that are safer and can be used in controlled amounts, replacing persistent toxic tin catalysts with shorter-lived, less harmful alternatives

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If conventional polymerization catalysts are used, then polymerization occurs, but reaction speed is slow

Engineering Contradiction:

Improvepolymerization capabilityVSAvoidreaction speed

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The patent combines organic initiators with organometallic compounds containing terminal free radicals to create a composite catalyst system that achieves both rapid polymerization and safety, overcoming the slow reaction speed of conventional catalysts

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention changes the chemical parameters of the catalyst system by using organometallic compounds with terminal free radicals, which significantly increases the polymerization reaction speed compared to traditional catalysts

Inventive Principle:

Principle #35Parameter changes

3Speed

If organometallic compound concentration is increased to speed up polymerization, then reaction speed increases, but catalyst complexity increases

Engineering Contradiction:

Improvepolymerization speedVSAvoidcatalyst composition complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The patent segments the catalyst system into distinct components (organic initiator and organometallic compound with terminal free radical), allowing independent optimization of each component while maintaining overall system simplicity and effectiveness

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20240253024A1Catalyst system for polyurethane foams

Publication Date: 2024.08.01 JOHNS HOPKINS UNIVERSITY

AI summary

Disclosed herein is a safe and rapid reacting catalyst for polyurethane polymerization. Also disclosed herein is a method of producing the catalyst and polymerizing polyurethane. The combination of an organic polymerization initiator and an organometallic polymerization initiator leads to a safer alternative to tin-based materials.