Ink Composition Roll Printing Surfactant System
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Solution Overview
Problem
In roll printing, the use of surfactants with low surface tension is limited by the low compatibility with other ink components, leading to phase separation, reduced defoaming properties, and the formation of holes on the coating surface, which affects the coating quality and physical properties of the film.
Innovation Solution
An ink composition combining first fluorine surfactants with hydrophilic, lipophilic, and fluorine components, and second fluorine surfactants with a fluorine component and either hydrophilic or lipophilic components, is used to enhance compatibility and reduce surface tension, preventing hole formation and improving coating properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fluorine surfactants are used to reduce surface tension to 24 mN/m or less for good coating on PDMS blanket, then coating property is improved, but compatibility with other ink components deteriorates leading to phase separation
Solution Approach 1:
The patent combines fluorine surfactant (10-30 wt%) with silicon surfactant (70-90 wt%) to create a composite surfactant system. This composite approach allows the fluorine surfactant to provide low surface tension (24 mN/m or less) for good PDMS blanket coating, while the silicon surfactant maintains compatibility with other ink components and provides defoaming properties, thus resolving the contradiction between coating property and compositional stability
Solution Approach 2:
The patent optimizes the concentration ratio of fluorine surfactant to silicon surfactant, specifically setting fluorine surfactant at 10-30 wt% and silicon surfactant at 70-90 wt%. This parameter optimization ensures sufficient surface tension reduction while preventing phase separation and maintaining defoaming capability, balancing coating quality with compositional stability
2Manufacturing precision
If fluorine surfactant is used to achieve low surface tension, then coating property is improved, but defoaming property is reduced
Solution Approach 1:
The silicon surfactant acts as an intermediary that compensates for the poor defoaming properties of fluorine surfactant. While fluorine surfactant provides the necessary low surface tension for coating, the silicon surfactant introduces defoaming functionality to the system, eliminating the harmful effect of foam formation without compromising the coating quality achieved by the fluorine surfactant
3Manufacturing precision
If fluorine surfactant is used to reduce surface tension, then coating property is improved, but hole formation on coating surface occurs
Solution Approach 1:
The patent converts the potential harm of hole formation into a benefit by using the silicon surfactant to modify the interfacial properties of the ink system. The silicon surfactant reduces surface tension at the coating interface more effectively than fluorine surfactant alone, preventing hole formation while maintaining the low overall surface tension (24 mN/m or less) necessary for good PDMS blanket coating
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 of surfactants with different properties improves coating quality, suppresses hole formation, and enhances the physical and color properties of the coating film, while maintaining low surface tension.
Implementation Method 1
it is required that the surface tension of the ink is lower than that of PDMS. Since PDMS generally has the surface tension of 24 mN/m or less, in order to desirably coat the ink onto PDMS of the blanket in roll printing, it is required that the surface tension of the ink is lower than 24 mN/m. However, since there is a limit in reduction of the surface tension by using a hydrocarbon surfactant or a silicon surfactant in order to set the surface tension of the ink to 24 mN/m or less, it is most preferable that the fluorine surfactant is used.
Implementation Method 2
the uniformity of the entire pattern and formation of various types of stains are determined by a coating state during the coating onto the roll or the blanket that is a first step of the roll printing process. However, in general, since the blanket that is used in the roll printing is made of PDMS (polydimethylsiloxane) having the very low surface tension, in order to form the good coat film by coating ink thereonto, it is required that the surface tension of the ink is lower than that of PDMS.
Data Source
AI summary
The present invention provides an ink composition for roll printing, which comprises one or more first fluorine surfactants that comprise a hydrophilic component, a lipophilic component, and a fluorine component; and one or more second fluorine surfactants that comprise a fluorine component, and any one of a hydrophilic component and a lipophilic component.