Polyurethane Polyurea Resin Composition Storage Stability
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Solution Overview
Problem
Polyurethane polyurea resin compositions with alcohol and ester solvents exhibit low storage stability due to viscosity decrease over time, leading to turbidity and coloration issues in printing inks.
Innovation Solution
Incorporating a polyhydroxymonocarboxylic acid with specific acid and hydroxyl values into the resin composition to inhibit amino group reactions with water, maintaining viscosity and preventing turbidity and coloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If polyurethane polyurea resin is used with alcohol and ester solvents, then work environment safety is improved by replacing toxic solvents, but storage stability deteriorates due to viscosity decrease over time
Solution Approach 1:
The patent introduces a polyhydroxymonocarboxylic acid as an intermediary substance that mediates between the amino groups of the polyurethane polyurea resin and water. This acid reacts with water to form carboxylic acid groups that interact with amino groups, preventing direct reaction between water and the resin's ester bonds, thus maintaining storage stability while using safer alcohol and ester solvents
Solution Approach 2:
The patent changes the chemical parameter of the resin composition by adding polyhydroxymonocarboxylic acid, which has specific acid value (340-500 mg KOH/g) and hydroxyl value (680-1,300 mg KOH/g). This parameter change modifies the chemical environment to prevent hydrolysis reactions, allowing the use of alcohol and ester solvents without sacrificing storage stability
2Reliability
If malic acid is added to inhibit amino group activity, then viscosity decrease is reduced, but turbidity and odor occur over time
Solution Approach 1:
The patent changes the chemical parameters by selecting polyhydroxymonocarboxylic acid with specific acid value (340-500 mg KOH/g) and hydroxyl value (680-1,300 mg KOH/g), which are optimized to provide sufficient protection against hydrolysis without causing turbidity or odor, unlike malic acid
Solution Approach 2:
The patent creates a composite chemical system by combining polyurethane polyurea resin with polyhydroxymonocarboxylic acid in specific ratios (0.03 to 5 parts by mass of acid per 100 parts by mass of nonvolatile matter in resin). This composite approach provides both viscosity stability and clarity without the harmful side effects of using malic acid
3Reliability
If polyhydroxymonocarboxylic acid is added to resin composition, then storage stability is improved without viscosity decrease or turbidity, but formulation complexity increases
Solution Approach 1:
The patent defines specific parameter ranges for polyhydroxymonocarboxylic acid (acid value: 340-500 mg KOH/g, hydroxyl value: 680-1,300 mg KOH/g, amount: 0.03-5 parts by mass per 100 parts nonvolatile resin) that simplify formulation by providing clear guidelines, reducing the complexity of achieving optimal storage 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 addition of polyhydroxymonocarboxylic acid ensures high storage stability of polyurethane polyurea resin compositions and printing inks without viscosity decrease, turbidity, or coloration over time, enhancing their usability and performance.
Implementation Method 1
water contained in the ester and alcohol solvents reacts with amino groups in the polyurethane polyurea resins to produce hydroxide ions, which cleave ester bonds in the polyurethane polyurea resins
Implementation Method 2
the addition of a polyhydroxymonocarboxylic acid having an acid value of 340 to 500 mg KOH/g and a hydroxyl value of 680 to 1,300 mg KOH/g to a resin composition containing a polyurethane polyurea resin and ester and alcohol solvents provides a resin composition that has high storage stability
Data Source
AI summary
Provided are a polyurethane polyurea resin composition that has high storage stability without a decrease in viscosity or turbidity over time and a printing ink that has high storage stability without a decrease in viscosity or coloration over time. The resin composition contains, as essential components, a polyurethane polyurea resin (A), a polyhydroxymonocarboxylic acid (B) having an acid value of 340 to 500 mg KOH/g and a hydroxyl value of 680 to 1,300 mg KOH/g, and at least one solvent selected from the group consisting of an ester solvent (C1) and an alcohol solvent (C2).