Aqueous Composition Shortening Drying Time
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Solution Overview
Problem
Current aqueous compositions using polycarbonate polyol do not effectively shorten the drying step, thin the cured product, or achieve both flexibility and high endurance, as highlighted by existing patent literatures.
Innovation Solution
An aqueous composition comprising a water-dispersible polyol with a specific carbonate structure and an aqueous polyurethane with hydrophilic groups, where the composition includes a water-dispersible polyol with a hydroxy value of 5 to 700 mg-KOH/g and an aqueous polyurethane with a hydrophilic group, optimized in terms of molecular weight and structure to enhance compatibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional polycarbonate polyol is used in aqueous composition, then water dispersibility is achieved, but drying time is extended and cured product thickness cannot be thinned
Solution Approach 1:
The patent changes the molecular structure parameters of the polyol by introducing specific carbonate groups (Formula I) with controlled hydroxy values (5-700 mg-KOH/g) and molecular weights (200-5000), which fundamentally alters the drying kinetics and film formation behavior, enabling both rapid drying and thin film formation while maintaining endurance
Solution Approach 2:
The patent creates a composite aqueous composition combining specifically structured polyol (Formula I) with aqueous polyurethane (Formula II), where the synergistic interaction between the two components achieves both rapid drying and high endurance properties that neither component could provide alone
2Reliability
If polycarbonate polyol with high endurance is used, then chemical resistance and heat resistance are improved, but flexibility is reduced
Solution Approach 1:
The patent introduces hydrophilic groups (carboxyl, sulfonic acid, or phosphate groups) at specific locations within the polyol molecule, creating local regions of different properties: the carbonate backbone provides endurance while the hydrophilic groups provide flexibility and water compatibility, achieving both properties simultaneously
Solution Approach 2:
By precisely controlling the hydroxy value (5-700 mg-KOH/g) and molecular weight (200-5000) of the polyol, the patent optimizes the balance between chain flexibility and crosslinking density, enabling the material to be both flexible and highly resistant to chemicals and heat
3Quantity of substance
If aqueous polyurethane with hydrophilic groups is used, then water dilutability is improved, but cured product thickness cannot be thinned
Solution Approach 1:
The patent optimizes the molecular weight parameters of both polyol (200-5000) and aqueous polyurethane (10000-300000), which controls the crosslinking density and film formation characteristics, enabling thin film formation while maintaining high endurance properties through optimized network structure
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 composition significantly shortens the drying step, thins the cured product, and achieves both flexibility and high endurance, addressing the limitations of existing technologies.
Implementation Method 1
a water-dispersible polyol having a carbonate structure represented by formula (I), having a hydroxy value of 5 to 700 mg-KOH/g, and having a hydrophilic structure
Implementation Method 2
an aqueous polyurethane having a hydrophilic group: wherein R represents a linear aliphatic hydrocarbon group optionally having a heteroatom, a branched aliphatic hydrocarbon group optionally having a heteroatom, a cyclic aliphatic hydrocarbon group optionally having a heteroatom, an aromatic hydrocarbon group optionally having a heteroatom, or a combination thereof
Data Source
AI summary
Provided is an aqueous composition capable of shortening of a drying step, thinning of a cured product, and achievement of both flexibility and high endurance. The present invention provides an aqueous composition comprising the following component (A) and the following component (B): component (A): a water-dispersible polyol having a carbonate structure represented by the following formula (I), having a hydroxy value of 5 to 700 mg-KOH/g, and having a hydrophilic structure; and component (B): an aqueous polyurethane having a hydrophilic group: wherein R represents a linear aliphatic hydrocarbon group optionally having a heteroatom, a branched aliphatic hydrocarbon group optionally having a heteroatom, a cyclic aliphatic hydrocarbon group optionally having a heteroatom, an aromatic hydrocarbon group optionally having a heteroatom, or a combination thereof.