Fluoropolymer Surface Treatment for Durable Water and Oil Repellency
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Solution Overview
Problem
Existing water and oil repellent agents fail to provide high water- and oil-repellency with excellent durability, particularly in textile treatments.
Innovation Solution
A water- and oil-repellent composition comprising a fluorine-containing polymer chemically bonded to a blocked isocyanate compound, where the polymer is formed by polymerizing a monomer with a polyfluoroalkyl group-containing (meth)acrylate in the presence of an isocyanate compound blocked with a pyrazole or malonate ester compound and a functional organopolysiloxane, resulting in an aqueous dispersion that imparts excellent water- and oil-repellency to surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluorocarbon polymers are used as water and oil repellent agents, then oil repellency is provided, but very high water- and oil-repellency with excellent durability cannot be achieved
Solution Approach 1:
The invention uses a composite material system consisting of fluorocarbon polymer, organopolysiloxane, and blocked isocyanate compound. This composite approach combines the oil repellency of fluorocarbon with the water repellency and durability of siloxane-isocyanate crosslinked networks, achieving both high water- and oil-repellency with excellent durability that conventional single-component fluorocarbon polymers cannot provide
Solution Approach 2:
The invention changes the chemical state and bonding parameters of the fluorocarbon polymer by forming chemical bonds with blocked isocyanate compounds. This transformation from physical coating to chemical bonding significantly improves the durability of water- and oil-repellency while maintaining high repellency performance
2Duration of action of stationary object
If fluorocarbon polymers are applied to textiles, then oleophobicity is imparted, but the treatment does not provide excellent durability against washing, dry cleaning and abrasion
Solution Approach 1:
The invention transforms the application state of fluorocarbon polymers from simple coating to chemical bonding by introducing blocked isocyanate compounds. This parameter change in bonding strength ensures the treatment withstands washing, dry cleaning and abrasion while maintaining water- and oil-repellency
Solution Approach 2:
The composite system of fluorocarbon polymer, organopolysiloxane, and blocked isocyanate creates a crosslinked network structure on textiles that provides superior durability against mechanical stress and chemical treatment compared to conventional fluorocarbon applications
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 composition effectively imparts excellent water- and oil-repellency and durability to substrates, including textiles, while providing a softer hand or feel compared to conventional treatments.
Implementation Method 1
a fluorine-containing polymer chemically bonded to the blocked isocyanate compound
Implementation Method 2
a fluorine-containing polymer prepared by polymerizing a monomer comprising: (I) a polyfluoroalkyl group-containing (meth)acrylate
Implementation Method 3
the functional organopolysiloxane bonds to the fluorine-containing polymer through the functional organic group
Data Source
AI summary
Disclosed is a fluorine-containing polymer prepared by polymerizing: (I) a polyfluoroalkyl group-containing (meth)acrylate, in the presence of: (II) an isocyanate compound blocked with a pyrazole compound or a malonate ester. A water- and oil-repellent composition containing the fluorine-containing polymer can impart the excellent water- and oil-repellency, and excellent durability thereof to substrates.