Tin Catalysts for Polyurethane Coatings Pot Life
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Solution Overview
Problem
Existing catalysts for producing polyisocyanate polyaddition products, such as polyurethane coatings, have limitations including short pot life, high catalyst loading, and stability issues like yellowing and increased viscosity, particularly with polyisocyanates containing iminooxadiazinedione groups.
Innovation Solution
A compound with the general formula (I) or (II) is used as a catalyst, characterized by specific radical substitutions and reactions with tin-containing compounds, which provides improved pot life, hardness, and reactivity while minimizing yellowing and viscosity issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If thermolatent catalysis systems are used to extend pot life, then pot life is improved, but catalyst requirement increases and stability deteriorates
Solution Approach 1:
The patent modifies the chemical structure of tin compounds by introducing specific organic radicals (R1-R11) with varying steric and electronic properties. This structural parameter change creates a balance between catalytic activity and stability, allowing extended pot life without excessive catalyst loading or degradation.
Solution Approach 2:
The invention combines tin compounds with specific organic radical structures to create composite catalyst systems. These composite structures integrate the reactivity of tin with the stability of organic moieties, achieving both extended pot life and maintained stability simultaneously.
2Productivity
If higher reactivity is achieved with same catalyst loading, then productivity is improved, but stability deteriorates due to increased yellowing and NCO drop
Solution Approach 1:
The patent introduces specific local structural features (R1-R11 radicals) at different positions around the tin center. These local structural variations create distinct electronic and steric environments that modulate catalytic activity locally while maintaining overall molecular stability.
Solution Approach 2:
The invention uses readily available industrial reactants to synthesize the catalyst compounds, making the approach economically viable. The catalysts are designed to be effective at low loadings, reducing the need for large amounts of expensive stabilizing additives.
3Speed
If organotin compounds are used as catalysts to accelerate reaction, then reaction speed is improved, but ecological profile deteriorates
Solution Approach 1:
The patent modifies the ecological profile by changing the organic substituents (R1-R11) on the tin compound. By selecting specific radical structures, the catalyst maintains effectiveness while reducing ecological harm, enabling use in environmentally sensitive applications like marine paints.
Solution Approach 2:
The invention extracts the essential catalytic function from traditional organotin compounds and separates it from their harmful ecological properties. By using tin compounds with specific organic radicals, the patent retains catalytic activity while removing or reducing the harmful aspects associated with conventional organotin catalysts.
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 proposed catalyst system offers a longer pot life, improved product hardness, and reduced catalyst loading, while maintaining or improving the stability of polyisocyanate polyaddition products, thus addressing the limitations of existing systems.
Implementation Method 1
a compound having the general formula (I) or (II) for use as catalyst in the production of polyisocyanate polyaddition products
Data Source
AI summary
The present invention relates to a compound for use as catalyst in the production of polyisocyanate polyaddition products, to the production thereof and to the use thereof as catalyst, preferably as thermolatent catalyst, for production of polyisocyanate polyaddition products. The invention further relates to a formulation and to a process for producing polyisocyanate polyaddition products, each using the compound of the invention, and to a polyisocyanate polyaddition product obtained or obtainable by said process. The invention finally relates to a coating composition for coating a substrate, comprising or consisting of the polyisocyanate polyaddition product of the invention.