Organic Fine Particle Dispersion Stability via Controlled Heating
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Solution Overview
Problem
Current methods for producing fine organic pigment particles face challenges in achieving stable dispersions with uniform particle sizes, as existing techniques often result in low productivity, high energy consumption, and instability due to factors like overdispersion and variations in yield and molecular weight, particularly in the context of ink-jet inks and color filters.
Innovation Solution
A method involving heating an organic fine particle dispersion liquid containing a high molecular compound under controlled conditions through a channel, where the heating treatment is conducted at temperatures between 40°C to 100°C, promoting thermodynamic stability and cross-linking of the high molecular compound with functional groups, which enhances dispersion stability and maintains particle diameter consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pigment particles are fined down to nanometer size to improve transparency and coloring power, then dispersion stability deteriorates due to increased specific surface area
Solution Approach 1:
A high molecular compound acts as an intermediary substance between the nanometer-sized pigment particles and the dispersion medium. This compound adsorbs onto the particle surfaces, providing steric stabilization that prevents aggregation despite the high specific surface area, thereby maintaining both transparency and dispersion stability simultaneously
Solution Approach 2:
The invention changes the molecular weight parameter of the stabilizing compound to high molecular weight range. This parameter change provides sufficient steric barrier to prevent aggregation of ultrafine particles while maintaining the desired nanometer size distribution for transparency and coloring power
2Length of moving object
If crushing method is used to reduce pigment particle size to nanometer level, then productivity decreases and energy consumption increases
Solution Approach 1:
Instead of using the conventional approach of breaking down large particles into small ones (crushing method), the invention inverts the process by building up small particles from molecular precursors through polymerization reactions. This build-up method achieves nanometer-sized particles with high productivity and low energy consumption, avoiding the time-consuming and energy-intensive crushing process
3Length of moving object
If high energy is applied in crushing method to reduce particle size, then overdispersion occurs causing thickening phenomenon
Solution Approach 1:
The invention replaces the mechanical crushing system with a chemical polymerization system. By substituting mechanical energy input with controlled chemical reactions, the process achieves particle size reduction without applying excessive energy that would cause overdispersion and thickening, maintaining stable dispersion characteristics
4Ease of manufacture
If batch method in flask is used for polymerization, then temperature control becomes difficult causing quality variations
Solution Approach 1:
The invention segments the polymerization process into controlled stages within a continuous flow reactor system. By dividing the reaction into manageable segments with controlled residence times and temperature zones, the process achieves both ease of operation and consistent quality uniformity, avoiding the temperature control difficulties of batch methods
Solution Approach 2:
The invention implements continuous polymerization reaction instead of batch processing. The continuous flow through the reactor ensures constant temperature control and steady-state reaction conditions, eliminating the temperature fluctuations and quality variations inherent in batch flask methods while maintaining operational simplicity
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 stable organic fine particle dispersions with particle diameters between 10 nm to 100 nm, improving dispersion stability, preventing viscosity increases, and enhancing the discharge capability of ink-jet inks while maintaining transparency and particle size consistency over time.
Implementation Method 1
cross-linking of the high molecular compound with functional groups, which enhances dispersion stability
Implementation Method 2
heating treatment under flowing through a channel, wherein the heating treatment is carried out at a temperature of 40°C to 100°C
Data Source
Figure 1-1~1-2
Figure 2-1~2-2
Figure 2-3~3-1
AI summary
A method of producing a dispersion of organic fine particles having a volume average particle diameter (Mv) of 10 nm to 100 nm, which has the step of: subjecting an organic fine particle dispersion liquid containing a high molecular compound to heating treatment under flowing through a channel.