Solid Solution Pigment Nanoparticles via Thin Film Mixing
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Solution Overview
Problem
Existing methods struggle to produce solid solution pigment nanoparticles with uniform and controlled solid solution ratios, which is essential for achieving stable dispersion and optimal color characteristics in applications like inkjet inks and paints, as they often result in non-uniform particle sizes and chemical properties that affect dispersibility and interaction with solvents.
Innovation Solution
A method involving the use of a thin film fluid processing technique where two or more pigment solutions are mixed between rotating processing surfaces, allowing for precise control of the solid solution ratio of pigment nanoparticles by adjusting the ratio of pigments in the solutions, achieving a precision of up to 5% variation in the final nanoparticle composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods (crushing treatment, heat treatment, or simple mixing) are used to produce solid solution pigment nanoparticles, then the production process is simple, but the solid solution ratio and particle size uniformity cannot be controlled
Solution Approach 1:
The invention changes the physical parameters of the processing system by introducing a thin film fluid state between processing surfaces and controlling the distance between surfaces to be 10 μm or less. This parameter change enables precise control of solid solution ratio and particle size while maintaining a relatively simple processing system without complex equipment
Solution Approach 2:
The invention transitions from conventional bulk mixing to thin film fluid processing, effectively moving the processing to a different dimensional regime (nanometer to micrometer scale gap between surfaces). This dimensional change allows for precise control of pigment nanoparticle formation and solid solution ratio that cannot be achieved in bulk processing
2Stability of the object's composition
If multiple pigments with different chemical properties are mixed using conventional methods, then various color tones can be achieved, but stable dispersion state is difficult to obtain
Solution Approach 1:
By changing the processing parameters to include thin film fluid state and surface distance control of 10 μm or less, the invention achieves stable dispersion of multiple pigments with different chemical properties. The controlled processing conditions prevent aggregation and ensure uniform distribution, making the dispersion process easier and more reliable
3Manufacturing precision
If pigment particles are separated in a thin film fluid as disclosed in Patent Document 4, then particle separation is achieved, but specific control of solid solution ratio in nanoparticles is not disclosed
Solution Approach 1:
The invention builds upon the thin film fluid concept from Patent Document 4 by adding specific parameter control: surface distance of 10 μm or less and controlled mixing of multiple pigment solutions. This enables precise solid solution ratio control while efficiently using pigment solutions through the thin film processing mechanism
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 enables the production of solid solution pigment nanoparticles with uniform solid solution ratios, enhancing color tone consistency and dispersibility, while minimizing chemical property variations that could impact performance in applications like inkjet inks and paints.
Implementation Method 1
two or more pigment solutions are mixed between rotating processing surfaces
Implementation Method 2
separating the solid solution pigment nanoparticle having a controlled solid solution ratio
Data Source
Figure 1
Figure 2(A)~2(B)
Figure 3(A)~3(B)
AI summary
The problem addressed by the present invention is to provide; solid solution pigment nanoparticles having a homogeneous solid solution ratio; a method for producing solid solution pigment nanoparticles having a homogeneous solid solution ratio in each primary particle; and a method for controlling the solid solution ratio of solid solution pigment nanoparticles. The solid solution pigment nanoparticles are prepared by precipitating at least two types of pigment by mixing a pigment precipitation solvent and; at least one type of pigment solution characterized in that at least two types of pigment are dissolved in a solvent: or at least two types of pigment solution characterized in that at least one type of pigment is dissolved in a solvent. The solid solution pigment nanoparticles are characterized in that the solid solution ratio of the at least two types of pigment in the primary particles of the precipitated solid solution pigment nanoparticles with respect to the ratio of the at least two types of pigment in the pigment solution mixed with the pigment precipitation solvent having a precision within 25%.