Crosslinking agent for aqueous resin, liquid containing crosslinking agent for aqueous resin, and aqueous-resin composition
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Solution Overview
Problem
Polycarbodiimide-based waterborne resin compositions face issues with short pot life and storage stability due to hydrophilic groups reacting with water, and existing methods using organic solvents like amyl acetate compromise environmental safety and stability.
Innovation Solution
Incorporating a hydrophobic polycarbodiimide compound with a water-soluble organic compound, such as alkylene glycol-based compounds or surfactants, to improve dispersibility and stability in waterborne resin compositions, enhancing storage stability and solvent resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a polycarbodiimide compound with a hydrophilic group at the terminal is used to disperse in water, then dispersibility is improved, but storage stability deteriorates due to carbodiimide group reaction with water
Solution Approach 1:
The patent uses an amine compound as an intermediary substance that reacts with the carbodiimide group to form a stable intermediate complex. This intermediary prevents direct reaction between the carbodiimide group and water, thereby extending pot life while maintaining dispersibility in aqueous resin compositions.
Solution Approach 2:
The patent modifies the chemical parameters of the polycarbodiimide compound by introducing specific structural features (aromatic rings, heteroatoms, and controlled hydrophilic groups) that alter its reactivity and stability characteristics, achieving both good dispersibility and extended storage stability.
2Stability of the object's composition
If a large amount of organic solvent like amyl acetate is used to disperse the polycarbodiimide compound, then dispersibility is improved, but environmental safety and storage stability deteriorate
Solution Approach 1:
The patent changes the dispersion mechanism from organic solvent-based to water-based by modifying the polycarbodiimide compound structure to include hydrophilic groups, thereby eliminating the need for harmful organic solvents while maintaining good dispersibility and storage stability.
Solution Approach 2:
The patent replaces expensive and environmentally harmful organic solvents with water, which is environmentally friendly and safer, achieving the same dispersibility function without the negative environmental impacts.
3Strength
If a polycarbodiimide compound is used to improve water resistance and durability, then crosslinking performance is improved, but storage stability deteriorates due to reaction with water
Solution Approach 1:
The patent introduces an amine compound as an intermediary that temporarily stabilizes the carbodiimide group during storage, preventing premature reaction with water. Upon application and heating, the intermediary decomposes, allowing the carbodiimide group to function for crosslinking and achieve water resistance.
Solution Approach 2:
The patent performs preliminary stabilization of the polycarbodiimide compound by forming a complex with the amine compound before application. This preliminary action prevents unwanted reactions during storage while preserving the crosslinking functionality for later use.
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 approach significantly improves the storage stability and solvent resistance of waterborne resin compositions, making them suitable for applications like paints, adhesives, and coatings while maintaining environmental safety.
Implementation Method 1
a waterborne resin crosslinking agent comprising a polycarbodiimide compound and a water-soluble organic compound as blending components, wherein the polycarbodiimide compound is a hydrophobic polycarbodiimide compound
Implementation Method 2
a carbodiimide group is present at the interface between the water and the waterborne resin and thus provides easy reaction with water
Data Source
AI summary
Provided is a carbodiimide-based, waterborne resin crosslinking agent that can improve the storage stability of a waterborne resin composition including a waterborne resin together with the crosslinking agent and further also improve the water resistance and the solvent resistance of a cured product of the waterborne resin. A waterborne resin crosslinking agent-containing liquid and a waterborne resin composition are prepared using a waterborne resin crosslinking agent comprising a hydrophobic polycarbodiimide compound and a water-soluble organic compound as blending components, wherein the water-soluble organic compound is one or more selected from the group consisting of an alkylene glycol-based compound, a water-soluble polymer other than the alkylene glycol-based compound, and a surfactant other than the alkylene glycol-based compound or the water-soluble polymer.