Fluorine Acetophenone Additive for Coating Transparency and Scratch Resistance
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Solution Overview
Problem
Existing surface modifiers, such as silicone and fluorine-containing polymers, fail to provide satisfactory scratch resistance and transparency in coatings due to structural limitations that hinder the full expression of slip and antifouling properties, and the density of fluorine atoms in the coating surface is limited, making it difficult to meet modern performance requirements.
Innovation Solution
A fluorine-containing acetophenone derivative with a poly(perfluoroalkylene ether) chain and a (meth)acryloyl group is introduced using Michael addition reaction, allowing for enhanced surface segregation and bonding of fluorine atoms, thereby improving antifouling, scratch resistance, and slip properties while maintaining coating transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fluorine-containing polymerizable resins with polar groups are used as surface modifiers, then compatibility with fluorine-free curable compounds is ensured, but the density of fluorine atoms in the coating surface is limited and slip properties are reduced
Solution Approach 1:
The patent removes the polar group from the fluorine-containing resin structure, extracting the element that was causing the problem. This allows the fluorine atoms to concentrate at the coating surface without being constrained by polar group interactions, thereby increasing fluorine atom density while maintaining compatibility through the fluorine-free curable compound matrix.
Solution Approach 2:
The patent creates local concentration of fluorine atoms at the coating surface through surface segregation. The fluorine-containing resin migrates to the surface during curing, creating a high-fluorine-density region at the interface while the bulk composition remains controlled. This local accumulation achieves high slip properties without requiring high overall fluorine content throughout the entire coating.
2Reliability
If fluorine-containing surface modifiers with additional monomer structures are used, then antifouling properties are improved to a degree, but the structural complexity increases and manufacturing precision is reduced
Solution Approach 1:
The patent segments the fluorine-containing resin into distinct functional components: a fluorine-rich perfluoroalkyl chain segment that provides antifouling and slip properties, and a fluorine-free curable segment that ensures compatibility and controlled polymerization. This segmentation allows independent optimization of each function while simplifying the overall molecular structure for better manufacturing control.
3Strength
If silicone-containing surface modifiers are used, then scratch resistance is improved, but transparency of the coating is reduced
Solution Approach 1:
The patent changes the chemical composition parameter by replacing silicone-based surface modifiers with fluorine-based surface modifiers. Fluorine-containing compounds provide scratch resistance through surface hardness and chemical inertness while maintaining optical clarity, unlike silicone modifiers that create hazy or opaque surfaces. This parameter change achieves both scratch resistance and transparency simultaneously.
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 fluorine-containing acetophenone derivative significantly enhances antifouling and scratch resistance properties, maintains coating transparency, and ensures long-term performance by segregating fluorine atoms to the surface and bonding strongly with other curable components, addressing the limitations of previous surface modifiers.
Implementation Method 1
a fluorine-containing acetophenone derivative which may be added to a curable composition to impart excellent antifouling properties, slip properties and scratch resistance to the surface of a cured product obtained from the composition
Implementation Method 2
an active energy ray curable composition which includes a silicone compound having a radically polymerizable unsaturated group in the molecule
Data Source
AI summary
The invention provides a fluorine-containing acetophenone derivative which is useful as an additive that can impart excellent antifouling properties and scratch resistance to the surface of a cured coating and that also offers high transparency of the coating; a fluoroadditive and an active energy ray curable composition which each include the above derivative; a cured product of the composition; and an article having a cured coating of the composition. Specifically, this object is achieved by using a fluorine-containing acetophenone derivative, typically represented by the structural formula below, that is obtained by introducing an acryloyl group into a poly(perfluoroalkylene ether) chain and thereafter introducing, using Michael addition reaction, an α-aminoacetophenone-based structural unit capable of generating radical species by photocleavage