Wetting Dispersing Agent Light Coloration
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Solution Overview
Problem
Conventional wetting and dispersing agents used in coating compositions and paints often struggle with reproducibility, particularly in producing light-colored products, and have limitations in broad-spectrum usefulness due to viscosity issues, coloration, and specific pigment compatibility.
Innovation Solution
A new wetting and dispersing agent is developed by reacting an amino-group-containing organic polymer with a branched polyhydroxymonocarboxylic acid and an organic monoisocyanate, forming amide and urethane bonds to create a product with improved dispersing and wetting properties, neutral coloration, and broad-spectrum applicability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dendritic dispersants are used to achieve dispersing effect in pigment concentrates, then dispersing performance is improved, but the product exhibits very dark or jet black coloration which limits usefulness in light-colored products
Solution Approach 1:
The invention changes the chemical composition parameters of the dispersing agent by using linear polyester backbone with specific monomer ratios (at least 50 mol% of first monomer units, at most 50 mol% of second monomer units) and controlled chain lengths. This parameter optimization allows the dispersing agent to achieve effective dispersing while maintaining a light color, resolving the contradiction between dispersing performance and coloration.
Solution Approach 2:
The dispersing agent is designed as a composite structure combining polyamine or polyimine functional groups with linear polyester chains containing specific acrylic functionality monomers. This composite material approach allows the molecule to exhibit both strong dispersing capabilities through the polyamine/polyimine core and light color through the linear polyester shell, simultaneously achieving both required properties.
2Reliability
If dispersant fraction is increased to achieve sufficient dispersing effect in products with strong color or high color accuracy requirements, then dispersing performance is improved, but the dark coloration influence becomes particularly marked
Solution Approach 1:
The invention optimizes the molecular weight parameters and functional group ratios of the dispersing agent to achieve high dispersing efficiency at lower concentrations. By controlling the polyester chain length and the ratio of polyamine to polyester components, the agent provides sufficient dispersing effect with minimal color influence, allowing use in light-colored and high-color-accuracy products without requiring high dispersant fractions.
3Reliability
If conventional dispersants are tailored to specific products to achieve good performance in one system, then dispersing performance is improved for that specific pigment type, but broad-spectrum usefulness is limited
Solution Approach 1:
The dispersing agent is designed with universal applicability through its balanced composition of polyamine/polyimine core and linear polyester shell containing diverse monomer units. The linear polyester backbone with controlled composition (50-50 mol% range of different monomers) provides compatibility with multiple pigment types, while the polyamine functional groups provide universal dispersing capability. This multi-functional design allows the single dispersing agent to perform effectively across broad-spectrum applications including light-colored, strong-color, and high-color-accuracy products.
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 new agent achieves enhanced storage stability, high gloss, low haze, and improved dispersing efficiency across various pigment-containing products, including paints and coatings, with a significantly lighter color compared to conventional agents, thus overcoming the limitations of existing technologies.
Implementation Method 1
reacting (a) an amino-group-containing organic polymer and (b) at least one branched polyhydroxymonocarboxylic acid by condensation reactions with formation of amide bonds
Implementation Method 2
condensation reactions with formation of amide bonds
Implementation Method 3
reacting at least some of the hydroxyl groups of the reaction product obtained in step (1) with at least one organic monoisocyanate to form urethane bonds
Data Source
AI summary
The invention relates to a wetting and dispersing agent that can be produced by carrying out step (1): wherein a) an organic polymer containing primary and/or secondary amino groups and b) at least one branched polyhydroxymonocarboxylic acid comprising, in addition to a carboxyl group, at least two hydroxy groups, one of which is not bound to the main chain of the molecule, are reacted by condensation reactions, forming amide linkages; and step (2): wherein at least some of the hydroxy groups of the hydroxy-functional reaction product obtained in step (1) are reacted with at least one organic monoisocyanate, forming urethane linkages.