Water-Based Ink Oxalate Control for Corrosion Prevention
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Solution Overview
Problem
Water-based inks using self-dispersible carbon black modified with the carboxylic acid group exhibit unsatisfactory water resistance and risk corrosion of metal components in ink-jet recording apparatuses, particularly due to the presence of oxalate ions which promote corrosion.
Innovation Solution
A water-based ink formulation containing carboxylic acid group-modified self-dispersible carbon black, water, and a water-soluble organic solvent, with oxalate ion concentration limited to no more than 45 ppm, and optionally including 1,2,3-benzotriazole to enhance corrosion prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-dispersible carbon black modified by carboxylic acid group is used, then water resistance is improved, but corrosion of metal members occurs
Solution Approach 1:
The patent converts the harmful effect of oxalate ions (which promote corrosion) into a beneficial outcome by precisely controlling their concentration to not more than 45 ppm. This allows the ink to maintain excellent water resistance through carboxylic acid group modification while preventing corrosion by limiting oxalate content, thus transforming a potentially harmful factor into a controlled parameter that serves both functions.
Solution Approach 2:
The patent applies parameter changes by precisely controlling the oxalate ion concentration to not more than 45 ppm. This quantitative parameter control allows the ink formulation to achieve both water resistance (through carboxylic acid modification) and corrosion prevention (through limited oxalate content), resolving the contradiction by adjusting the concentration parameter of oxalate ions.
2Object-affected harmful factors
If oxalate ion concentration is reduced to prevent corrosion, then corrosion resistance is improved, but water resistance may be compromised
Solution Approach 1:
The patent resolves this contradiction by changing the parameter of oxalate ion concentration to not more than 45 ppm while maintaining carboxylic acid group modification. This specific parameter setting allows the ink to achieve both corrosion resistance (through low oxalate) and water resistance (through carboxylic acid modification), proving that the two requirements are compatible at this concentration level.
Solution Approach 2:
The patent applies local quality by differentiating the functional roles of different components: carboxylic acid group modification provides water resistance, while controlled oxalate content (≤45 ppm) provides corrosion resistance. Each component performs its specific function locally, allowing the ink as a whole to achieve both properties without compromise.
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 ink achieves excellent water resistance and significantly reduces or prevents corrosion of metal components in ink-jet recording apparatuses, maintaining jetting stability and storage stability while minimizing oxalate ion-induced corrosion.
Implementation Method 1
self-dispersible carbon black modified by the carboxylic acid group which has excellent water resistance
Implementation Method 2
oxalate ion is contained in the water-based ink in a amount of not more than 45 ppm by weight... capable of lowering or preventing the corrosion of a metal member
Implementation Method 3
The self-dispersible carbon black modified with the sulfonate group has a satisfactory dispersion stability of the pigment for a long period of time
Data Source
AI summary
There is provided a water-based ink for ink-jet recording including: a self-dispersible carbon black modified by carboxylic acid group; water; and a water-soluble organic solvent, wherein oxalate ion is contained in the water-based ink in a amount of not more than 45 ppm by weight.