Water- and Oil-Repellent Coating Film with Composite Particles
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Solution Overview
Problem
Existing water- and oil-repellent coating technologies do not reliably achieve satisfactory water repellency and oil repellency, particularly in practical applications involving packaging materials and other surfaces.
Innovation Solution
A water- and oil-repellent coating film containing metal oxide-containing composite particles with a polyfluoroalkyl methacrylate resin covering layer, which provides a synergistic effect with the uneven surface structure formed by these particles for enhanced repellency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluorinated coating methods are used, then water repellency and oil repellency are imparted to the surface, but the repellency is not reliable and satisfactory in practical applications
Solution Approach 1:
The patent uses composite particles consisting of inorganic fine particles (such as silica) coated with an organic fluorinated polymer layer. This composite structure combines the advantages of both materials: the inorganic particles provide surface roughness and structural stability, while the fluorinated polymer provides low surface energy for repellency. The synergistic effect achieves reliable and satisfactory water and oil repellency that conventional single-material coatings cannot achieve.
2Reliability
If a coating is applied to impart water and oil repellency, then the surface gains protective properties, but the coating may affect heat sealability and other functional properties
Solution Approach 1:
The patent applies the coating only to specific regions where water and oil repellency is needed, rather than uniformly across the entire surface. The coating amount and thickness are controlled to provide sufficient repellency while leaving other areas unaffected. This localized application maintains heat sealability and other functional properties in regions where they are required.
Solution Approach 2:
The patent carefully controls key parameters including particle size (0.1-10 μm), coating amount (1-10 mg/cm²), and fluorinated polymer content to optimize the balance between repellency and functional properties. By adjusting these parameters, the coating provides reliable water and oil repellency while minimizing negative effects on heat sealability and other functions.
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 coating film exhibits excellent water repellency and oil repellency, effectively preventing the adherence of aqueous and oily liquids, making it suitable for various packaging materials and surfaces.
Implementation Method 1
a water- and oil-repellent coating film... containing metal oxide-containing composite particles with a polyfluoroalkyl methacrylate resin covering layer, which provides a synergistic effect with the uneven surface structure formed by these particles for enhanced repellency
Implementation Method 2
the uneven surface structure formed by these particles for enhanced repellency
Data Source
AI summary
Provided is a coating film that can more reliably exhibit an excellent water repellency and an excellent oil repellency. This water- and oil-repellent coating film is a coating film formed on a surface of a material in order to impart water repellency and oil repellency, wherein (1) the coating film contains a metal oxide-containing composite particle; (2) the composite particle contains a) a metal oxide particle and b) a covering layer that contains a polyfluoroalkyl methacrylate resin and is formed on the surface of the metal oxide particle; and (3) a value obtained by dividing the fluorine content (weight %) of the composite particle by a surface area (m2/g) of the metal oxide particle is 0.025 to 0.180.