Aqueous Ink Composition Using Mixed Carbon Blacks for Stable Jetting
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Solution Overview
Problem
Ink jet recording methods using environmentally friendly carbon blacks, such as plant oil-derived and recycled raw material-derived carbon blacks, face challenges in color developing properties, storage stability, continuous ejection stability, and recovery from clogging due to irregular particle structures and varying wettability.
Innovation Solution
An ink composition combining plant oil-derived and petroleum-derived carbon blacks with specific BET surface areas and surfactants with tailored HLB values to enhance stability and wettability, improving color developing properties and ejection stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If plant oil-derived carbon black is used as an environmentally friendly coloration material, then environmental friendliness is improved, but color developing properties deteriorate
Solution Approach 1:
The patent combines plant oil-derived carbon black (environmentally friendly) with petroleum-derived carbon black (high color developing properties) in specific ratios to achieve both environmental friendliness and excellent color developing properties. This merging of two different carbon black types resolves the contradiction between environmental benefits and color performance.
Solution Approach 2:
The invention creates a composite pigment system using multiple types of carbon black with different characteristics. By formulating a composite material that includes plant oil-derived carbon black, petroleum-derived carbon black, and specific dispersants, the patent achieves both environmental sustainability and high-quality color development.
2Object-affected harmful factors
If plant oil-derived carbon black is used, then environmental friendliness is improved, but storage stability deteriorates
Solution Approach 1:
The patent introduces specific dispersants and surfactants as intermediary substances that mediate between the plant oil-derived carbon black particles and the aqueous ink medium. These intermediaries improve wetting and dispersion, thereby enhancing storage stability while maintaining the environmental benefits of plant oil-derived carbon black.
Solution Approach 2:
The invention modifies the surface properties and dispersion characteristics of plant oil-derived carbon black by adjusting parameters such as particle size distribution, surface treatment, and dispersant concentration. These parameter changes improve storage stability without compromising environmental friendliness.
3Object-affected harmful factors
If plant oil-derived carbon black is used, then environmental friendliness is improved, but continuous ejection stability deteriorates
Solution Approach 1:
The patent optimizes parameters including particle size distribution, viscosity control through polyol selection, and surfactant concentration to ensure stable ink ejection. By carefully adjusting these parameters, the invention achieves reliable continuous ejection performance while maintaining environmental sustainability.
Solution Approach 2:
The invention replicates the successful formulation approach used in conventional petroleum-based inks by creating an analogous aqueous system with plant oil-derived carbon black. By copying the functional requirements and adjusting for environmental constraints, the patent achieves continuous ejection stability in an environmentally friendly formulation.
4Object-affected harmful factors
If plant oil-derived carbon black is used, then environmental friendliness is improved, but recovery from clogging deteriorates
Solution Approach 1:
The patent employs specific surfactants and dispersants as intermediary substances that prevent carbon black aggregation and nozzle clogging. These intermediaries maintain particle stability and facilitate easy recovery from clogging events while preserving the environmental benefits of plant oil-derived carbon black.
Solution Approach 2:
The invention incorporates preventive measures through careful formulation with anti-aggregation agents and viscosity modifiers that cushion against clogging events before they occur. This prior cushioning approach ensures that even if clogging occurs, the system can easily recover, maintaining both environmental friendliness and operational reliability.
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 combination achieves improved storage stability, color developing properties, and continuous ejection stability by leveraging the advantages of both carbon blacks and surfactants, addressing the limitations of using single carbon blacks.
Implementation Method 1
the surfactant includes a surfactant A having an HLB value of 10 or more and less than 15 and a surfactant B which is an acetylene glycol-based surfactant having an HLB value of 3 or more and less than 10
Implementation Method 2
the pigment includes a plant oil-derived carbon black and/or a recycled raw material-derived carbon black, and a petroleum-derived carbon black
Data Source
AI summary
An ink composition for ink jet containing a pigment, in which the pigment includes a plant oil-derived carbon black and/or a recycled raw material-derived carbon black, and a petroleum-derived carbon black, a BET specific surface area of the plant oil-derived carbon black and/or the recycled raw material-derived carbon black is 50 m2/g or more and 120 m2/g or less, a BET specific surface area of the petroleum-derived carbon black is 160 m2/g or more and 280 m2/g or less, and the ink composition for ink jet is an aqueous ink.