Polyamideimide Coating Composition with High Solid Content
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Solution Overview
Problem
Existing aqueous polyamideimide solutions for coating applications typically have low solid content, requiring significant solvent removal during drying/curing, and face toxicological issues associated with traditional solvents like N-methylpyrrolidone.
Innovation Solution
An aqueous solution is developed with a polyamideimide polymer prepared in N-n-butyl pyrrolidone, achieving a solid content greater than 20 wt.%, using specific reaction conditions and additives to form a polyamic acid-amine salt, which is then dissolved in water, along with N-n-butylpyrrolidone, to create a coating composition with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional solvents like N-methylpyrrolidone are used to achieve high solid content, then coating performance is improved, but toxicological issues arise
Solution Approach 1:
The patent changes the solvent parameter from traditional N-methylpyrrolidone to water as the continuous phase, fundamentally altering the solvent type while maintaining high solid content (20-40 wt%). This parameter change eliminates toxicological issues associated with NMP while preserving coating performance through controlled evaporation and curing processes.
Solution Approach 2:
The patent introduces N-n-butylpyrrolidone as an intermediary solvent that facilitates the dissolution of polyamideimide polymer in water. This intermediary substance enables the formation of stable aqueous solutions with high solid content, acting as a bridge between the hydrophobic polymer and hydrophilic water medium.
2Quantity of substance
If aqueous solutions with high solid content are prepared, then solvent removal requirements increase, but coating efficiency decreases
Solution Approach 1:
The patent optimizes the solid content parameter to fall within 20-40 wt%, which represents a balanced range that avoids excessive solvent removal requirements while maintaining adequate coating performance. This parameter optimization prevents energy-intensive drying processes while ensuring proper film formation.
Solution Approach 2:
The patent creates a simplified coating system that copies the effectiveness of traditional high-performance coatings but with reduced complexity in the drying/curing process. By using water as the continuous phase with controlled solid content, the system achieves similar protective functions with fewer energy consumption and simpler processing steps.
3Object-affected harmful factors
If polyamideimide is dissolved in water to achieve aqueous composition, then environmental friendliness improves, but solubility difficulties arise
Solution Approach 1:
The patent employs N-n-butylpyrrolidone as an intermediary substance that mediates between the hydrophobic polyamideimide polymer and hydrophilic water. This intermediary facilitates uniform dissolution and stable solution formation, enabling environmentally friendly aqueous compositions while overcoming inherent solubility barriers.
Solution Approach 2:
The patent creates a composite solvent system combining water and N-n-butylpyrrolidone in specific proportions (water: 50-90 wt%, N-n-butylpyrrolidone: 10-50 wt%). This composite approach leverages the environmental benefits of water while incorporating N-n-butylpyrrolidone to ensure adequate polymer solubility and solution stability.
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 solution achieves a higher solid content and improved coating properties, such as non-stick and reduced friction, while minimizing solvent usage and toxicological risks, with a viscosity range suitable for coating applications.
Implementation Method 1
a reaction product obtained by reacting b1. a polyamideimide polymer... with b2. an amine compound
Implementation Method 2
N-n-butylpyrrolidone... to create a coating composition
Data Source
AI summary
The present invention relates to an aqueous composition comprising: ⋅Water; ⋅A reaction product obtained by reacting ⋅a polyamideimide polymer obtainable by reacting suitable starting materials in N-n-butyl pyrrolidone at a temperature in the range from 80-120° C. until a polymer is formed with an Mw of between 10000 to 40000 g/mol (Dalton) and a Mw/Mn ratio between 1.1 and 2, with ⋅an amine compound; ⋅Optionally an amine compound, and ⋅N-n-butylpyrrolidone. and the use thereof in coating compositions.