Associative Neutralizing Agents for Paint Stability
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Solution Overview
Problem
Aqueous and solvent-based paints face instability issues during storage and sensitivity to humid atmospheres due to the use of conventional neutralizing agents like 2-amino-2-methyl-1-propanol, which are volatile organic compounds (VOCs), leading to phase separation and blistering in paint films, and existing non-VOC alternatives fail to provide adequate stability and rheological properties.
Innovation Solution
The use of associative neutralizing agents comprising a neutralizing group, a spacer group, and a nitrogen-containing associative group, which are non-VOC and provide pH adjustment while enhancing storage stability and rheological properties, such as viscosity, and can act as co-thickeners and co-dispersants in paint formulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional neutralizing agents like 2-amino-2-methyl-1-propanol (AMP) are used, then good neutralizing action is achieved, but storage stability deteriorates with phase separation and syneresis
Solution Approach 1:
The patent changes the chemical parameters of the neutralizing agent by selecting compounds with specific molecular structures (associative groups capable of hydrogen bonding) and physical properties (higher boiling points, lower volatility) to eliminate phase separation and syneresis while maintaining neutralizing effectiveness
Solution Approach 2:
The invention uses composite molecular structures combining neutralizing groups (for pH adjustment) with associative groups (for stability enhancement through hydrogen bonding), creating a multi-functional neutralizing agent that simultaneously provides neutralization and prevents phase separation
2Reliability
If AMP is used as neutralizer, then adequate pH adjustment is obtained, but film sensitivity to humid atmospheres increases causing blistering
Solution Approach 1:
The patent modifies the physical and chemical parameters of the neutralizing agent by selecting compounds with higher molecular weight and different hydrophobicity characteristics, which alter the film's interaction with moisture and prevent blistering while maintaining pH control
3Object-generated harmful factors
If non-VOC neutralizers are used to meet regulations, then VOC content is reduced, but paint stability and rheological properties deteriorate
Solution Approach 1:
The patent identifies and utilizes specific molecular parameters (associative group presence, hydrogen bonding capability, molecular structure) that allow non-VOC compounds to achieve both regulatory compliance and optimal paint performance, reversing the traditional trade-off
Solution Approach 2:
The invention employs composite molecular structures that integrate neutralizing functionality with associative properties, creating non-VOC agents that simultaneously provide stability, rheological control, and film formation without the drawbacks of conventional non-VOC alternatives
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 associative neutralizing agents, particularly UDETA, offer improved storage stability, reduced sensitivity to water, increased viscosity, and better applicability on various surfaces, while avoiding plasticization and maintaining film hardness, outperforming conventional neutralizers like AMP®, and demonstrating co-dispersant properties when used with amphiphilic polymers.
Implementation Method 1
a pH adjustment is generally necessary in order to stabilize the latex. This adjustment is called neutralization.
Implementation Method 2
at least one nitrogen-containing associative group A, connected to one another by at least, and preferably, one spacer group Sp
Data Source
AI summary
The invention relates to a method of neutralizing paints, that includes adding at least one associative neutralizing agent to a formulation such as a pigment concentrate, a white paint base or paint. The associative neutralizing agent includes at least one neutralizing group N and at least one nitrogenous associative group A bonded together by at least one “spacer” group Sp. The invention also relates to pigment concentrates and to paints containing at least one such associative neutralizing agent.