Crosslinkable Coating Composition for Formaldehyde-Free Low-Temp Curing
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Solution Overview
Problem
There is a need for crosslinking chemical processes that are free of isocyanates and formaldehyde, particularly in one-part and two-part coating systems, to address environmental and health concerns associated with these compounds.
Innovation Solution
A crosslinkable coating system comprising a urea component and an aldehyde, optionally with a catalyst and amine, forms a reaction product that is free or substantially free of formaldehyde and isocyanate, allowing for crosslinking at low temperatures without the use of these harmful chemicals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isocyanates or formaldehyde are used for crosslinking in coating systems, then crosslinking reactivity and adhesion properties are improved, but environmental and health hazards increase due to the presence of harmful chemicals
Solution Approach 1:
The patent removes harmful substances (isocyanates and formaldehyde) from the coating system while maintaining crosslinking functionality. This is achieved by substituting the traditional crosslinking chemistry with alternative components that do not rely on these hazardous chemicals, thereby extracting the harmful elements while preserving the essential crosslinking function.
Solution Approach 2:
The patent introduces alternative crosslinking components that act as intermediaries to achieve crosslinking without using harmful chemicals. These alternative components mediate the crosslinking process through different chemical mechanisms that do not involve isocyanates or formaldehyde, thus maintaining reactivity while eliminating health and environmental hazards.
2Strength
If traditional crosslinking chemicals are used, then adhesion properties are maintained, but the coating system requires higher curing temperatures and longer processing times
Solution Approach 1:
The patent changes the chemical parameters of the crosslinking system by using alternative components with different reactivity profiles. This allows the crosslinking reaction to proceed effectively at lower temperatures and shorter times while maintaining adhesion properties, as the alternative chemistry requires less thermal energy to activate and complete the crosslinking process.
3Productivity
If isocyanates or formaldehyde are used for crosslinking, then crosslinking efficiency is improved, but the complexity of handling and safety protocols increases
Solution Approach 1:
The patent extracts harmful substances from the system, which simultaneously removes the need for complex safety protocols and handling procedures associated with these chemicals. By eliminating isocyanates and formaldehyde, the system maintains crosslinking efficiency while significantly simplifying safety requirements and handling complexity.
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 coating system provides a polymeric coating that is free of formaldehyde and isocyanate, offering a safe and effective alternative for coating various materials, including wood, metals, and polymers, while maintaining reactivity and adhesion properties.
Implementation Method 1
The urea component and the aldehyde may form a reaction product represented by Formula (III)... The urea component and the aldehyde may form a further reaction product represented by Formula (IV)
Data Source
AI summary
Crosslinkable coating systems, methods of coating articles with the crosslinkable coating systems, and articles coated with the same are provided. The coating system includes a urea component and an aldehyde comprising two or more carbon atoms. The coating system may include a solvent. The coating system may be free or substantially free of fonnaldehyde and isocyanate. The coating system may include a reaction product of a urea component and an aldehyde comprising two or more carbon atoms. The coating system may be in powder form.