Dioxazine Pigment Surface Modification for Ink Fluidity
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Solution Overview
Problem
Dioxazine pigments, such as C.I. Pigment Violet 23, tend to exhibit poor fluidity and aggregation issues when used in printing inks and coatings, leading to problems with viscosity and storage stability.
Innovation Solution
Modifying the surface of dioxazine pigment particles to achieve specific contact angles with water and organic solvents, specifically between 30° to 75°, and incorporating hydroxy and carbonyl groups to enhance wettability and dispersion stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dioxazine pigment is used for coloring applications, then coloring function is achieved, but fluidity deteriorates due to particle aggregation
Solution Approach 1:
The patent applies parameter changes by modifying the contact angle parameter of the pigment particle surface. By controlling the contact angle with water to be 30°-75° and with 1-bromonaphthalene to be 30°-75° through surface modification, the pigment achieves optimal wettability and dispersion characteristics, resolving the contradiction between maintaining coloring function and improving fluidity.
2Manufacturing precision
If pigment particles are aggregated to enhance color strength, then coloring intensity improves, but viscosity increases and fluidity decreases
Solution Approach 1:
The patent changes the surface energy parameters of the pigment particles by controlling contact angles. This modification allows pigment particles to disperse uniformly without excessive aggregation, achieving adequate color strength while maintaining low viscosity and good fluidity in the printing ink composition.
3Ease of operation
If derivative treatment is applied to improve fluidity, then flow characteristics improve, but migration and reduced retort resistance occur
Solution Approach 1:
The patent applies local quality modification by treating only the surface of the pigment particles rather than chemically modifying the entire pigment structure. The surface is modified to achieve specific contact angles (30°-75° with water, 30°-75° with 1-bromonaphthalene) through methods such as adsorbing surfactants or performing plasma treatment, while the core pigment structure remains intact. This localized approach improves fluidity without causing migration or reducing retort resistance.
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 modified dioxazine pigments demonstrate improved fluidity, initial viscosity, and storage stability in printing inks, while avoiding the drawbacks of derivative treatments, such as migration and reduced retort resistance.
Implementation Method 1
modifying the surface of the pigment particles to have specific contact angles with respect to water and an organic solvent, respectively, by modifying the surface of the pigment particles
Data Source
AI summary
An object of the present invention is to provide a dioxazine pigment having excellent fluidity. More specifically, an object of the present invention is to provide a dioxazine pigment in which practically sufficient fluidity is attained in both (1) initial viscosity and (2) storage stability when the dioxazine pigment is used in a printing ink application. The object is attained by providing a dioxazine pigment having a contact angle with respect to water according to an infiltration rate method in a range of 30° to 75°, and a contact angle with respect to 1-bromonaphthalene according to an infiltration rate method in a range of 30° to 75°.