Water-based Coating Composition Gloss Control
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Solution Overview
Problem
Conventional water-based coating compositions used in ink jet coating face issues with unstable injection, poor adhesion, inadequate gloss, and susceptibility to cissing or bleeding, due to compatibility problems with pigments, solvents, resins, and wetting agents, and lack of effective control over gloss and storage stability.
Innovation Solution
A water-based coating composition containing a colorant, water, a wetting agent, an amine compound, a hydroxyl group-containing organic solvent, and a urethane resin with a polycarbonate group, which allows for controlled gloss, improved wetting properties, and continuous discharge stability without nozzle clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional coating composition is used for ink jet coating, then the coating process can be performed, but unstable injection occurs and adhesion to the object to be coated is poor
Solution Approach 1:
The patent changes the chemical parameters of the coating composition by specifying a pH range of 8.0 or more (preferably 8.5 to 10.5) and using particular binder resins with carboxyl groups, which stabilizes the injection process and improves adhesion to the object to be coated
Solution Approach 2:
The patent uses a composite system combining specific binder resins (with carboxyl groups), pigments, and surfactants in controlled proportions to achieve both stable injection and good adhesion properties simultaneously
2Illumination intensity
If the gloss of the coating film is reduced through selection of pigments, solvents, resins and wetting agents, then a matte effect is achieved, but the compatibility of the coating composition deteriorates
Solution Approach 1:
The patent maintains compatibility while controlling gloss by adjusting the pH parameter to 8.0 or more and using specific binder resin types with carboxyl groups, which allows the coating composition to remain stable even when matte effects are achieved through pigment and solvent selection
3Object-generated harmful factors
If a surface conditioner is added to prevent cissing or bleeding, then the surface quality improves, but the complexity of the coating composition increases
Solution Approach 1:
The patent uses surfactants that perform multiple functions: they improve wetting properties, prevent cissing and bleeding, and maintain coating stability, thereby reducing the need for separate surface conditioners and simplifying the overall composition
4Productivity
If conventional aqueous coating composition is used, then water-based coating is achieved, but continuous discharge stability is poor and nozzle clogging occurs
Solution Approach 1:
The patent changes the pH parameter to 8.0 or more and controls the particle size and distribution of pigments and binders, which prevents precipitation and clogging during continuous ink jet discharge, ensuring stable productivity
Solution Approach 2:
The patent optimizes the local properties of the coating composition by controlling the size distribution of pigment particles and their interaction with the binder resin, ensuring that the composition remains stable and does not clog nozzles during continuous discharge
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 composition achieves stable storage, excellent wetting properties, and controlled gloss of the coating film, while preventing nozzle clogging and ensuring continuous discharge stability, thereby addressing the limitations of conventional coatings.
Implementation Method 1
insufficient adjustment of a difference in interfacial tension from an object to be coated
Implementation Method 2
a water-based coating composition containing a colorant, water, a wetting agent
Data Source
AI summary
According to a water-based composition characterized by containing a colorant, water, a wetting agent, an amine compound, a hydroxyl group-containing organic solvent and a urethane resin having a polycarbonate group, there is provided a water-based coating composition being capable of easily controlling the gloss of a coating film applied on an object to be coated, having good storage stability, and being excellent in wetting properties to an object to be coated and continuous discharge stability without causing nozzle clogging.