Fluorinated Copolymer Soil Release Coating With Wash Durability
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Solution Overview
Problem
Existing fluorine-containing copolymers used for treating textiles lack sufficient washing durability and soil releasability, especially when the perfluoroalkyl group has less than 8 carbon atoms, leading to compromised oil repellency and soil release performance.
Innovation Solution
A fluorine-containing copolymer comprising repeating units from a fluorine-containing monomer, polyalkyleneglycol (meth)acrylate, a monomer with an acetoacetyl group, and a cation-donating monomer, combined with a crosslinking agent, which enhances oil repellency, stain resistance, and soil releasability while maintaining durability even with shorter perfluoroalkyl groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorine-containing copolymers with perfluoroalkyl groups having 8 or more carbon atoms are used to ensure sufficient oil repellency and soil releasability, then oil repellency and soil releasability are improved, but washing durability deteriorates
Solution Approach 1:
The invention changes the chemical structure parameters of the fluorine-containing copolymer by specifying particular monomer compositions and ratios, including the use of specific hydrophilic groups and fluorinated monomers, to achieve both high oil repellency and improved washing durability simultaneously
Solution Approach 2:
The invention creates a composite fluorine-containing copolymer system that combines multiple functional monomers (fluorinated monomers, hydrophilic monomers, and crosslinkable monomers) to achieve synergistic effects that resolve the contradiction between initial performance and washing durability
2Object-affected harmful factors
If the perfluoroalkyl group chain length is reduced to less than 8 carbon atoms to improve environmental compatibility, then environmental safety is improved, but oil repellency and soil releasability deteriorate
Solution Approach 1:
The invention changes the chemical parameters by using shorter perfluoroalkyl groups (less than 8 carbon atoms) while compensating for reduced oil repellency through optimized copolymer composition, including specific ratios of hydrophilic and fluorinated monomers, to maintain sufficient soil releasability
Solution Approach 2:
The invention develops a composite copolymer system that integrates shorter fluorinated chains with enhanced hydrophilic components and crosslinking structures to achieve environmental compatibility while maintaining functional performance
3Reliability
If conventional fluorine-containing copolymers are used to provide stain-proofing properties, then initial oil repellency is improved, but washing durability of stain-proofing properties deteriorates
Solution Approach 1:
The invention applies preliminary crosslinking structures within the copolymer chain that activate during washing processes, providing progressive enhancement of stain-proofing properties through repeated washing cycles rather than relying solely on initial coating
Solution Approach 2:
The invention uses a composite copolymer structure combining fluorinated monomers with crosslinkable functional groups that create a durable network, ensuring both initial oil repellency and long-term washing durability of stain-proofing properties
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 solution provides excellent oil repellency, soil resistance, and soil releasability, particularly for natural fibers like cotton, with improved washing durability and flip-flop properties, even when the perfluoroalkyl group has fewer than 8 carbon atoms, outperforming previous technologies.
Implementation Method 1
Flip-flop properties are properties that a surface molecular structure varies depending on the environment in air and water
Implementation Method 2
In air, perfluoroalkyl groups (hereinafter abbreviated as Rf groups) are oriented on the surface so that high oil repellency is exhibited
Implementation Method 3
In contrast, in water, Rf groups retract and hydrophilic groups are oriented on the surface, and thus soils are easily released
Data Source
AI summary
Disclosed is a soil release agent composition essentially containing a fluorine-containing copolymer, which is essentially composed of (a) a fluorine-containing monomer having a fluoroalkyl group, (b) a polyalkyleneglycol (meth)aorylate, (c) a monomer having an acetoacetyl group and (d) a monomer having a cation-donating group, and a crosslinking agent. This soil release agent composition imparts a base material such as a fiber fabric with excellent oil repellency, antifouling property and soil releasing property, while maintaining washing resistance of the base material. The monomer (a) is preferably represented by the following formula (1). CH2=C(-X)-C(=O)-Y-Z-Rf (1) (In the formula, X represents a hydrogen atom, a linear or branched alkyl group having 1-21 carbon atoms, a fluorine atom, a chlorine atom or the like; Y represents -O or -NH-; Z represents an aliphatic group having 1-10 carbon atoms, an aromatic group having 6-18 carbon atoms, an alicyclic group or the like; and Rf represents a linear or branched fluoroalkyl group having 1-21 carbon atoms.)