Modified Organic Pigments with Interface-Active Compounds
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Solution Overview
Problem
Existing methods for producing organic pigments require additional grinding steps and struggle to achieve high color intensity without the use of additional wetting agents and dispersants.
Innovation Solution
The production of modified organic pigments involves reacting pigments with interface-active compounds during synthesis, selecting those within a specific three-dimensional Hansen space defined by Hansen solubility parameters, to enhance dispersion and color intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional grinding steps are used to improve pigment dispersion, then dispersion quality improves, but manufacturing complexity and time increase
Solution Approach 1:
The pigment particles are pre-modified during the synthesis process itself, before any grinding or dispersion steps are performed. The interface-active compounds are incorporated into the pigment structure during formation, creating pre-modified pigments that inherently possess improved dispersion properties without requiring subsequent grinding operations.
Solution Approach 2:
The pigment synthesis process automatically incorporates interface-active compounds through the reaction conditions, eliminating the need for separate modification steps. The pigment modifies itself during formation by reacting with the interface-active compounds present in the synthesis medium, thereby self-equipping with dispersion-enhancing properties.
2Manufacturing precision
If wetting agents and dispersants are added to improve pigment dispersion, then dispersion quality improves, but color intensity decreases
Solution Approach 1:
The functions of the pigment (color provision) and the dispersant (dispersion enhancement) are merged into a single integrated component. The interface-active compounds are chemically bonded to the pigment particles, creating a hybrid structure where the pigment core provides color while the attached interface-active layer provides dispersion properties, eliminating the need for separate dispersant additives.
Solution Approach 2:
The pigment particles are transformed into composite structures with a core-shell architecture. The core consists of the original pigment providing color intensity, while the shell consists of interface-active compounds covalently bonded to the surface, providing dispersion stability. This composite structure combines the beneficial properties of both components without the negative effects of separate additive systems.
3Manufacturing precision
If pigment particles are reduced to small diameter to improve dispersion, then dispersion quality improves, but agglomeration tendency increases
Solution Approach 1:
The surface properties of the pigment particles are fundamentally changed by incorporating interface-active compounds during synthesis. This chemical modification alters the surface energy, polarity, and interfacial characteristics of the particles, creating steric and electrostatic barriers that prevent agglomeration even at small particle diameters where surface area-to-volume ratio is high.
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
This approach allows for the production of pigments with improved dispersion properties and high color intensity, eliminating the need for additional grinding and optimizing pigment distribution in coating systems.
Implementation Method 1
The present invention relates to modified organic pigments, and to the production and use thereof... obtainable by reacting the pigments during the pigment synthesis with at least one interface-active compound
Implementation Method 2
the interface-active compounds are selected such that they are within a three-dimensional Hansen space... Being surface-active materials, the dispersants wet and cover the surface of the particles to be dispersed, and stabilize them against unwanted reagglomeration
Implementation Method 3
the interface-active compounds are selected such that they are within a three-dimensional Hansen space, where the Hansen space is determined by three coordinates, called the Hansen solubility parameters (HSPs)
Data Source
AI summary
A modified organic pigment can be used to make a coating composition, such as a paint, a varnish, or a printing ink. The modified organic pigment is obtained by reacting the pigments during the pigment synthesis with one interface-active compound, where the interface-active compound is a compound within a three-dimensional Hansen space determined by three coordinates, Hansen solubility parameters (HSPs), D=18.21, P=8.44, H=13.16 with a radius of 6.7 units about a center of the three-dimensional Hansen space, determined with the aid of the HSPiP software, version 5.0.0.4.