Polymer Dispersant for TiO2 Ink Stability
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Solution Overview
Problem
Titanium oxide, used in white ink for concealing backgrounds, tends to settle and aggregate over time, leading to separation and increased viscosity, which affects the ink's dispersibility and concealing ratio, resulting in defective discharging in inkjet printing.
Innovation Solution
A polymer with a specific structural unit, represented by Chemical Formula 1, is used to enhance the storage stability and re-dispersibility of titanium oxide inks, preventing aggregation and maintaining uniform dispersion, thereby improving the ink's performance and the quality of printed images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If titanium oxide is used in white ink for concealing backgrounds, then the concealing ratio is improved, but the ink tends to settle and aggregate over time, leading to separation and increased viscosity
Solution Approach 1:
A polymer dispersant with specific chemical structure (containing phosphonic acid groups and aromatic rings) is introduced as an intermediary substance between titanium oxide particles and the ink medium. This dispersant adsorbs onto the titanium oxide surface, providing steric and electrostatic repulsion that prevents aggregation and settling, thereby maintaining storage stability while preserving the high concealing ratio of titanium oxide
Solution Approach 2:
The ink formulation is transformed into a composite system consisting of titanium oxide particles, polymer dispersant, and ink medium. The polymer dispersant forms a protective interface layer around titanium oxide particles, creating a stable composite structure that prevents settling and aggregation while maintaining the optical properties of titanium oxide for effective background concealment
2Reliability
If titanium oxide is used in white ink, then the concealing performance is improved, but the ink viscosity increases and discharging becomes defective
Solution Approach 1:
The polymer dispersant acts as a mediator that reduces the effective viscosity of the ink by preventing particle aggregation. By adsorbing onto titanium oxide surfaces and providing repulsive forces, the dispersant maintains particle separation, ensuring smooth ink flow and proper discharging from inkjet nozzles while preserving the high concealing performance of titanium oxide
Solution Approach 2:
The chemical parameters of the ink system are modified by introducing a polymer dispersant with specific functional groups (phosphonic acid, aromatic rings). This changes the interfacial properties and rheological behavior of the ink, reducing viscosity and improving discharging performance while maintaining the optical properties of titanium oxide for effective concealment
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 polymer ensures excellent storage stability and re-dispersibility of titanium oxide, maintaining the ink's viscosity and concealing ratio, ensuring consistent and high-quality image formation.
Implementation Method 1
A polymer with a specific structural unit, represented by Chemical Formula 1, is used to enhance the storage stability and re-dispersibility of titanium oxide inks, preventing aggregation and maintaining uniform dispersion
Implementation Method 2
The polymer ensures excellent storage stability and re-dispersibility of titanium oxide, maintaining the ink's viscosity and concealing ratio
Implementation Method 3
A polymer with a specific structural unit, represented by Chemical Formula 1, is used to enhance the storage stability and re-dispersibility of titanium oxide inks
Data Source
AI summary
A polymer having a structural unit represented by the following Chemical Formula 1,where R1 represents hydrogen or a methyl group, L1 represents —COO—, —CONH—, or a single bond, X represents a hydrocarbon group having 2 to 10 carbon atoms or a hydrocarbon group having 2 to 10 carbon atoms and containing oxygen, L2 represents —O— or —NH—, Y represents a hydrocarbon group having 2 to 12 carbon atoms, and L3 represents —NH—C2H4—R2, —O-Ph-CH2CH(R2)2, or —O—Np—CH2CH(R2)2, where Ph represents a phenylene group, Np represents a naphthylene group, and R2 represents a phosphonic acid group.