Titanium Oxide Aqueous Ink Dispersion for Stable Inkjet Ejection
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Solution Overview
Problem
Existing aqueous inks containing titanium oxide particles face challenges in maintaining stable dispersion and ejection stability under varying environmental conditions, particularly due to the interaction between the dispersant and the titanium oxide particles, which affects the ink's performance.
Innovation Solution
Aqueous inks are formulated with titanium oxide particles coated with specific proportions of alumina and silica, using a dispersant represented by general formula (1) to balance dispersion stability and ejection stability, where the titanium oxide particle surface is covered with alumina and silica in a specific mass ratio, and the dispersant forms hydrogen and covalent bonds with the surface hydroxy groups to maintain stable dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a dispersant is used to disperse titanium oxide particles in aqueous ink, then dispersion stability is improved, but ejection stability deteriorates due to excessive adsorption and energy consumption during ejection
Solution Approach 1:
The patent changes the chemical composition parameters of the dispersant by specifying particular compounds (polyacrylic acid, polyacrylamide, or their copolymers) with controlled molecular weights and concentrations. This optimization allows the dispersant to provide sufficient dispersion stability while minimizing excessive adsorption that would consume energy during ejection, thereby resolving the contradiction between dispersion stability and ejection stability.
Solution Approach 2:
The patent creates a composite system combining titanium oxide particles, aqueous medium, and specifically selected dispersants. This composite formulation achieves a balanced interaction where the dispersant adequately stabilizes the titanium oxide suspension without creating excessive adsorption forces that would hinder ejection performance, thus resolving the stability contradiction.
2Stability of the object's composition
If the dispersant is strongly adsorbed on titanium oxide particles, then dispersion stability is improved, but energy consumption during ejection increases
Solution Approach 1:
The patent optimizes the adsorption parameter by selecting dispersants with specific chemical characteristics (polyacrylic acid, polyacrylamide, or copolymers) and controlling their concentration. This parameter optimization ensures adequate adsorption for dispersion stability while preventing excessive adsorption that would require additional energy during the ejection process, thereby resolving the contradiction between dispersion stability and energy consumption.
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 formulation achieves improved ejection stability of the ink by controlling the dispersant's presence around the titanium oxide particles, preventing excessive adsorption and energy consumption during ejection, thereby maintaining consistent ink performance.
Implementation Method 1
the dispersant forms hydrogen and covalent bonds with the surface hydroxy groups to maintain stable dispersion
Implementation Method 2
The dispersant is present while repeating adsorption on and desorption from titanium oxide
Implementation Method 3
titanium oxide particles coated with specific proportions of alumina and silica, where the titanium oxide particle surface is covered with alumina and silica in a specific mass ratio
Data Source
Figure 1
Figure 2A~2B
AI summary
An aqueous ink for ink jet recording contains a titanium oxide particle containing titanium oxide, at least part of the surface of the titanium oxide being covered with alumina and silica in specific proportions, and a compound serving as a dispersant for the titanium oxide particle, the compound being represented by the following general formula (1): where in general formula (1), R1, R2 and R3 are each independently a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, each R4 is independently an alkylene group having 2 to 4 carbon atoms, X is a single bond or an alkylene group having 1 to 6 carbon atoms, n is 6 to 24, a is 1 to 3, b is 0 to 2 and a + b = 3.