Quinacridone Inkjet Ink Sulfur Control for Nozzle Clogging
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Solution Overview
Problem
Conventional inkjet recording liquids with quinacridone pigment suffer from ejection displacement and dispersion stability issues due to electrostatic adhesion of synthetic intermediates and sulfur-containing pigment derivatives to the recording head, leading to aggregation and nozzle clogging.
Innovation Solution
The inkjet ink formulation includes quinacridone pigment, pigment dispersion resin, and an aqueous medium, with a sulfur concentration of 0.4 ppm to 7.0 ppm and a predetermined light absorbance of 0.7 or less, ensuring a 50 weight percent or less unabsorbed resin ratio to minimize electrostatic adhesion and aggregation, thereby stabilizing dispersion and preventing ejection displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional inkjet recording liquids with quinacridone pigment are used, then color performance is achieved, but ejection displacement and dispersion stability deteriorate due to electrostatic adhesion of synthetic intermediates and sulfur-containing pigment derivatives to the recording head
Solution Approach 1:
The patent removes harmful synthetic intermediates and sulfur-containing pigment derivatives from the ink formulation through purification processes, extracting these harmful factors to prevent electrostatic adhesion and ejection displacement while maintaining the desired color performance of quinacridone pigment
Solution Approach 2:
The patent optimizes the sulfur concentration parameter to 0.4-7.0 ppm and controls the unabsorbed resin ratio to 50 wt% or less, changing these chemical parameters to achieve stable dispersion and prevent electrostatic adhesion without compromising color quality
2Stability of the object's composition
If pigment dispersion resin is added to improve dispersion stability, then dispersion stability improves, but unabsorbed resin increases which may cause electrostatic adhesion
Solution Approach 1:
The patent optimizes the unabsorbed resin ratio parameter to 50 wt% or less by adjusting resin concentration and absorption conditions, achieving stable dispersion while minimizing excess unabsorbed resin that could cause electrostatic adhesion to the recording head
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 inkjet ink effectively suppresses ejection displacement and enhances dispersion stability, ensuring reliable inkjet recording by reducing the occurrence of white streaks and improving the solubility of dried ink on the recording head.
Implementation Method 1
The pigment dispersion resin contains absorbed resin that is absorbed by the quinacridone pigment and unabsorbed resin that is not absorbed by the quinacridone pigment
Implementation Method 2
supernatant liquid obtained by centrifuging the inkjet ink at 1,050,000 G for three hours
Data Source
AI summary
An inkjet ink contains quinacridone pigment, pigment dispersion resin, and aqueous medium. The pigment dispersion resin contains absorbed resin that is absorbed by the quinacridone pigment and unabsorbed resin that is not absorbed by the quinacridone pigment. A ratio of the unabsorbed resin to the pigment dispersion resin is 50 weight percent or less. A sulfur concentration in the 10-fold diluent of supernatant liquid obtained by centrifuging the inkjet ink at 1,050,000 G for three hours is 0.4 ppm or more and 7.0 ppm or less. In an ultraviolet and visible ray absorption spectrum of the 25-fold diluent of the supernatant liquid, light absorbance at a predetermined peak is 0.7 or less. The predetermined peak is a maximum peak in a wavelength range of 400 nm or more and 490 nm or less.