Polyisocyanate Synthesis Stabilizing Catalysts with High Permittivity Additives
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Solution Overview
Problem
Existing processes for producing polyisocyanates with high iminooxadiazinedione groups face issues due to catalyst decomposition, leading to the formation of disruptive by-products and requiring additional purification steps, which increases effort and costs.
Innovation Solution
The process involves using a catalyst in conjunction with an additive having a relative permittivity of at least 4.0 at 18°C to 30°C, such as nitriles or cyclic lactones, to stabilize the catalyst and prevent decomposition, allowing for the production of polyisocyanates with high iminooxadiazinedione groups without additional purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If catalysts such as (hydrogenpoly)fluorides are used for isocyanate modification, then high iminooxadiazinedione groups are formed, but catalyst decomposition occurs leading to disruptive by-products and requiring additional purification
Solution Approach 1:
A base catalyst is introduced as an intermediary substance that mediates between the isocyanate monomer and the acid catalyst. The base catalyst forms a complex with the acid catalyst, creating a stable catalytic system that promotes iminooxadiazinedione formation without the decomposition issues of traditional acid catalysts alone. This intermediary base catalyst stabilizes the reaction system and eliminates harmful by-products.
Solution Approach 2:
The invention changes the chemical parameters of the catalyst system by combining base and acid catalysts in specific ratios. By adjusting the catalyst composition parameters (base to acid ratio) and reaction conditions (temperature, catalyst concentration), the system achieves high iminooxadiazinedione formation while maintaining catalyst stability and preventing decomposition into disruptive by-products.
2Manufacturing precision
If additional purification steps are implemented to remove by-products, then product purity is improved, but process complexity and effort increase
Solution Approach 1:
The invention converts the potentially harmful effect of catalyst decomposition into a beneficial outcome by using a base catalyst that prevents decomposition rather than causes it. The base catalyst stabilizes the acid catalyst and eliminates the formation of disruptive by-products, thereby removing the need for additional purification steps while maintaining high product purity.
Solution Approach 2:
The catalytic system is designed to be self-stabilizing through the base catalyst that automatically prevents decomposition of the acid catalyst. The system serves itself by maintaining its own stability and preventing by-product formation, eliminating the need for external purification interventions and simplifying the overall process.
3Reliability
If catalyst decomposition is prevented, then by-product formation is reduced, but catalyst effectiveness may be diminished
Solution Approach 1:
The invention creates a composite catalytic system combining base and acid catalysts that work synergistically. The base catalyst stabilizes the acid catalyst while both together provide enhanced catalytic activity for iminooxadiazinedione formation. This composite approach maintains high effectiveness while preventing decomposition, achieving both stability and productivity.
Solution Approach 2:
The base catalyst and acid catalyst are merged into a single integrated catalytic system that functions together. The combination creates a stable complex that maintains catalytic activity while preventing decomposition, achieving both reliability and productivity simultaneously through the synergistic effect of the merged catalyst system.
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
This approach significantly improves catalyst stability, reduces phosphorus content in recyclates, and eliminates the need for additional purification, resulting in more efficient and cost-effective production of polyisocyanates with improved properties.
Implementation Method 1
at least one additive (A) having a relative permittivity at 18° C. to 30° C. of at least 4.0
Data Source
AI summary
The invention relates to a method for producing polyisocyanates-containing iminooxadiazinedione groups, wherein at least one monomeric di- and/or triisocyanate is oligomerized in the presence of a) at least one catalyst, b) at least one additive (A) having a relative permittivity at 18 °C to 30 °C of at least 4.0, and c) optionally additional additives different from A. The invention further relates to a reaction system for producing polyisocyanates containing iminooxadiazinedione groups and the use of an additive (A) having a relative permittivity at 18 °C to 30 °C of at least 4.0 to produce polyisocyanates containing iminooxadiazinedione groups by means of the catalyzed modification of monomeric di- and/or triisocyanates.