Fluorine Polymer Coating for Liquid Repellency and Slippability
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Solution Overview
Problem
Existing methods for imparting liquid repellency and slippability to article surfaces using fluorine-containing polymers, such as those obtained by copolymerizing perfluoro(allyl vinyl ether) and perfluoro(propyl vinyl ether), often fail to achieve satisfactory results in terms of liquid repellency and slippability.
Innovation Solution
A fluorine-containing polymer is developed, comprising Unit A with a fluorine-containing aliphatic ring structure forming the main chain and Unit B based on a fluorine-containing monomer with a hetero atom like oxygen or sulfur, but without a fluorine-containing aliphatic ring structure. The polymer has a residual rate of polymerizable carbon-carbon double bonds not exceeding 0.5 mol %, allowing for enhanced liquid repellency and slippability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If copolymerization of perfluoro(allyl vinyl ether) and perfluoro(propyl vinyl ether) is performed, then liquid repellency can be improved, but satisfactory liquid slippability cannot be achieved
Solution Approach 1:
The patent changes the chemical structure parameters of the polymer by introducing Units A and B with specific molecular configurations. Unit A contains a fluorine-containing aliphatic ring structure while Unit B contains hetero atoms (oxygen or sulfur) without fluorine-containing aliphatic rings. This structural parameter change enables both liquid repellency and slippability to coexist.
Solution Approach 2:
The patent creates a composite polymer structure combining two distinct types of units (Unit A with fluorine-containing aliphatic rings and Unit B with hetero atoms). This composite approach allows the material to exhibit both liquid repellency (from the fluorine-containing structures) and liquid slippability (from the hetero atom-containing structures), resolving the contradiction between these two properties.
2Object-affected harmful factors
If surface energy is lowered to achieve liquid repellency, then liquid slippability cannot be achieved
Solution Approach 1:
The patent changes the surface chemical composition parameters by incorporating specific fluorine-containing cyclic structures (Unit A) and hetero atom-containing structures (Unit B). This creates a surface with unique properties that differ from conventional low-surface-energy coatings, enabling both high liquid repellency and liquid slippability simultaneously.
Solution Approach 2:
The patent creates local structural differences within the polymer coating by distributing Unit A and Unit B throughout the structure. The fluorine-containing aliphatic rings provide local regions for liquid repellency, while the hetero atom-containing regions provide pathways for liquid slippage, allowing both functions to operate locally within the same 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 fluorine-containing polymer effectively forms a coating film with excellent liquid repellency and slippability, as well as superior heat resistance, making it suitable for various applications including surface treatment agents and protective films.
Implementation Method 1
By forming a coating film of the fluorine-containing compound, the surface energy decreases, thus enhancing the liquid repellency
Implementation Method 2
Liquid slippability describes a state in which liquid droplets readily roll across the surface
Data Source
AI summary
The present invention provides a fluorine-containing polymer that is capable of forming a coating film having excellent liquid repellency and liquid slippability. Specifically provided is a fluorine-containing polymer containing a Unit A having a fluorine-containing aliphatic ring structure that constitutes the main chain, and a Unit B based on a fluorine-containing monomer b that has at least one type of hetero atom selected from the group consisting of an oxygen atom and a sulfur atom, and does not have a fluorine-containing aliphatic ring structure constituting the main chain, wherein the residual rate of polymerizable carbon-carbon double bonds is not more than 0.5 mol %.