Sulfonic Acid-Modified Polyisocyanate With Low Turbidity Stability
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Solution Overview
Problem
Existing methods for preparing sulfonic acid-modified polyisocyanates face issues such as poor compatibility with isocyanate, leading to slow reaction rates, high product turbidity, and deepening of storage color, which affect the performance of water-based coatings and adhesives.
Innovation Solution
A method involving the use of cyclohexylamine to improve compatibility between sulfonic acid and polyisocyanate, catalyzed by tertiary amines, results in a fast reaction rate, low turbidity, and good storage stability, producing a hydrophilic sulfonic acid-modified polyisocyanate suitable for water-dispersible coatings and adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If solid sulfonic acid compounds are used to modify isocyanate curing agents, then the sulfonic acid-modified polyisocyanate can be dispersed evenly in water, but the compatibility is poor and the interface reaction leads to long reaction time and deep product color
Solution Approach 1:
The patent changes the physical state parameter of the sulfonic acid compound from solid to liquid form. This parameter change improves compatibility with isocyanate, accelerates the reaction rate, and prevents the interface reaction problems associated with solid powders, thereby reducing reaction time while maintaining good water dispersibility
Solution Approach 2:
The patent introduces a catalyst as an intermediary substance to mediate the reaction between sulfonic acid and isocyanate. The catalyst facilitates the interface reaction, accelerates the modification process, and prevents deep product coloration by enabling complete and controlled reaction
2Stability of the object's composition
If solid sulfonic acid compounds are used to modify isocyanate curing agents, then the sulfonic acid-modified polyisocyanate can be dispersed evenly in water, but the incomplete reaction of solid powders will cause high turbidity of product and deepen the color with the extension of storage time
Solution Approach 1:
Changing the sulfonic acid compound from solid to liquid form ensures complete mixing and reaction with isocyanate, eliminating incomplete reaction products that cause turbidity. The liquid state allows for homogeneous distribution and complete reaction, producing clear, transparent modified polyisocyanate with stable color properties
Solution Approach 2:
The catalyst acts as an intermediary to ensure complete and thorough reaction between sulfonic acid and isocyanate. By facilitating the reaction process, the catalyst prevents the formation of unreacted solid particles that would cause product turbidity, resulting in a clear and stable final product
3Adaptability or versatility
If polyether-modified isocyanate curing agents are used, then good hydrophilicity is achieved, but low effective isocyanate content and poor resistance are caused by the high polyether content
Solution Approach 1:
The patent changes the hydrophilic group from polyether chains to sulfonic acid groups. This parameter change maintains good hydrophilicity and water dispersibility while avoiding the drawbacks of high polyether content, such as low effective isocyanate content and poor resistance properties, thereby achieving both adaptability and reliability
Solution Approach 2:
The patent extracts the problematic polyether component from the isocyanate structure and replaces it with sulfonic acid groups. This extraction eliminates the negative effects of high polyether content (low NCO content, poor resistance) while retaining the desired hydrophilic properties through the sulfonic acid functional groups
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 method enhances the reaction rate, reduces product turbidity, and maintains excellent storage stability, resulting in a hydrophilic sulfonic acid-modified polyisocyanate with light color and improved dispersibility in water-based systems.
Implementation Method 1
catalyzed by tertiary amines
Implementation Method 2
A method involving the use of cyclohexylamine to improve compatibility between sulfonic acid and polyisocyanate
Data Source
AI summary
Disclosed are a sulfonic acid-modified polyisocyanate and a preparation method thereof. By controlling a content of cyclohexylamine component in the raw material, the reaction rate of sulfamic acid and polyisocyanate is accelerated, so that the prepared product has advantages of light color and low turbidity as well as good storage stability.