Fluorinated Hard Coat Composition Defoaming and Compatibility
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Solution Overview
Problem
The existing fluorinated compound-containing compositions used for hard coat layers suffer from foaming issues during solvent distillation, leading to reduced productivity, and have insufficient compatibility with alternative solvents, resulting in cloudy compositions and inadequate antifouling properties.
Innovation Solution
Incorporating a compound with a polymerizable carbon-carbon double bond and an active hydrogen-containing group in specific concentrations into the fluorinated compound-containing composition to enhance compatibility and suppress foaming, while adjusting solvent content and reaction conditions to optimize the formation of a fluorinated compound with antifouling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the fluorinated compound-containing composition is distilled to replace the reaction solvent, then the solvent is replaced with a suitable coating solvent, but the composition foams during distillation, increasing distillation time and reducing productivity
Solution Approach 1:
A defoaming agent is introduced as an intermediary substance to suppress foaming during distillation. The defoaming agent breaks down the foam structure and prevents stable foam formation, allowing the distillation process to proceed smoothly without productivity loss.
Solution Approach 2:
The composition is modified by adjusting parameters such as adding defoaming agents or modifying surfactant content to change the foam stability characteristics. This parameter change suppresses excessive foaming during distillation while maintaining the antifouling properties of the fluorinated compound.
2Ease of manufacture
If the fluorinated compound-containing composition is filled into a container, then the composition is prepared for shipment, but the composition foams during filling, requiring slower filling rates and reducing productivity
Solution Approach 1:
A defoaming agent serves as an intermediary that prevents foam formation during the filling process. This allows the composition to be filled at normal rates without overflow risks, maintaining productivity while ensuring proper packaging.
3Reliability
If a fluorinated compound is used to impart antifouling properties, then oily ink repellency and fingerprint removability are improved, but compatibility with coating solvents is insufficient, resulting in cloudy composition
Solution Approach 1:
The composition is formulated as a composite system combining the fluorinated compound with specifically selected coating solvents and auxiliary agents. This composite approach ensures mutual compatibility between components while maintaining the antifouling properties of the fluorinated compound, preventing cloudiness.
Solution Approach 2:
The solvent system parameters are optimized by selecting specific solvent types and ratios that are compatible with the fluorinated compound. This parameter optimization ensures complete miscibility and prevents precipitation or cloudiness while preserving antifouling performance.
4Strength
If the fluorinated compound-containing composition is used for hard coat layer formation, then scratch prevention is achieved, but antifouling properties are insufficient without proper composition modification
Solution Approach 1:
The invention merges two functional components: a hard coat-forming component providing scratch resistance and a fluorinated compound providing antifouling properties. By combining these components in a single composition system, the resulting hard coat layer simultaneously achieves both hardness and antifouling performance.
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 composition effectively imparts excellent antifouling properties, improves compatibility, and prevents foaming, resulting in a hard coat layer with enhanced oily ink repellency and fingerprint removability, and maintains storage stability.
Implementation Method 1
a compound having a polymerizable carbon-carbon double bond and an active hydrogen-containing group
Implementation Method 2
reacting triisocyanate, a perfluoropolyether having one active hydrogen, and a monomer having active hydrogen and a polymerizable carbon-carbon double bond
Data Source
AI summary
A composition including a fluorinated compound (A), a compound (B) and a solvent (S1), wherein the content of the fluorinated compound (A) in the composition is from 5 to 30 mass % to the composition, and the content of the compound (B) is from 0.1 to 2 mass % to the composition, wherein the fluorinated compound (A) has no isocyanate group and has a portion derived from a compound (a) having a poly(oxyperfluoroalkylene) chain and an active hydrogen-containing group, a portion derived from a compound (b) having a polymerizable carbon-carbon double bond and an active hydrogen-containing group, and a portion derived from a polyisocyanate (c), and wherein the compound (B) has a polymerizable carbon-carbon double bond and an active hydrogen-containing group.