Water- and Oil-Repellent Agent with Composite Polymer Blend
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Solution Overview
Problem
Conventional water- and oil-repellent agents using fluorine-containing compounds face adhesion issues on rollers during textile processing and have poor performance when fluoroalkyl chains have fewer than 8 carbon atoms, requiring additional monomers like vinyl chloride or vinylidene chloride, which increases environmental impact.
Innovation Solution
A water- and oil-repellent agent is developed by blending a fluorine-containing polymer, polymerized with a fluorine-containing monomer, non-fluorinated branched monomer, non-fluorinated crosslinking monomer, and olefin monomer, with a fluorine-free polymer polymerized using non-fluorinated non-crosslinking and crosslinking monomers and olefin monomers, optimizing the composition to reduce adhesion problems and fluorine usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fluorine-containing compounds with 4-6 carbon atoms in fluoroalkyl are used, then the environmental impact is reduced and fluorine usage is minimized, but the waterproofing and oil-proofing effect becomes poorer
Solution Approach 1:
The patent combines fluorine-containing polymer and fluorine-free polymer in a specific ratio (30-70% fluorine-free polymer by weight) to create a composite water- and oil-repellent agent. This composite structure allows the system to achieve good water- and oil-repellent effects while using reduced fluorine content (4-6 carbon atoms in fluoroalkyl), thereby reducing environmental impact without sacrificing performance
Solution Approach 2:
The patent optimizes the composition parameters by controlling the weight ratio of fluorine-free polymer to fluorine-containing polymer within 30-70%, and by specifying the fluoroalkyl chain length (4-6 carbon atoms). These parameter optimizations enable the agent to achieve effective water-repellency while minimizing fluorine usage and environmental impact
2Reliability
If vinyl chloride or vinylidene chloride is added to enhance waterproofing effect, then the water tolerance effect is improved, but adhesion problems occur on rollers during processing
Solution Approach 1:
The patent modifies the chemical composition parameters by replacing vinyl chloride or vinylidene chloride with specific non-fluorinated monomers (acrylic acid, methacrylic acid, acrylonitrile, or their derivatives) in controlled amounts (0.1-10% by weight). This parameter change maintains water tolerance effect while eliminating adhesion problems on rollers during textile processing
Solution Approach 2:
The patent uses readily available non-fluorinated monomers that can be easily polymerized and applied, replacing the problematic vinyl chloride/vinylidene chloride system. These alternative monomers provide the necessary water tolerance without the adhesion issues, making the processing easier and more reliable
3Reliability
If perfluoroalkyl ethyl acrylate with 8 carbon atoms in fluoroalkyl is used, then good waterproofing and oil-proofing effect is achieved, but fluorine usage increases and environmental impact worsens
Solution Approach 1:
The patent changes the fluoroalkyl chain length parameter from 8 carbon atoms to 4-6 carbon atoms, and optimizes the overall formulation by incorporating fluorine-free polymer (30-70% by weight). This parameter optimization maintains effective water- and oil-repellent properties while reducing fluorine content, thereby decreasing environmental impact
Solution Approach 2:
The patent creates a composite system combining fluorine-containing polymer with reduced fluoroalkyl chains (4-6 carbon atoms) and fluorine-free polymer. This composite approach allows the system to achieve the necessary performance level without requiring high fluorine content, thus reducing environmental burden while maintaining effectiveness
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 a good water- and oil-repellent effect while minimizing adhesion issues on rollers and reducing environmental impact by optimizing the polymer composition, achieving effective water-repellency on textiles with reduced fluorine content.
Implementation Method 1
This type of surface treatment agents have better waterproofing and oil-proofing effect on surfaces of textiles
Implementation Method 2
This type of surface treatment agents have better waterproofing and oil-proofing effect on surfaces of textiles
Data Source
AI summary
A water- and oil-repellent agent is produced by blending a fluorine-containing polymer and a fluorine-free polymer, wherein the fluorine-free polymer is 30-70% by weight of the total of the water- and oil-repellent agent, the fluorine-containing polymer is polymerized by a fluorine-containing monomer, a non-fluorinated branched monomer, a non-fluorinated crosslinking monomer, and an olefin monomer, and wherein the fluorine-containing monomer, the non-fluorinated branched monomer, the non-fluorinated crosslinking monomer, and the olefin monomer are 45-80%, 1-30%, 1-10%, and 10-50% by weight of the total of the fluorine-containing polymer respectively- and the fluorine-free polymer is polymerized by a non-fluorinated non-crosslinking monomer, a non-fluorinated crosslinking monomer, and an olefin monomer, wherein the non-fluorinated non-crosslinking monomer, the non-fluorinated crosslinking monomer, and the olefin monomer are 45-80%, 1-30%, and 10-50% by weight of the total of the fluorine-free polymer respectively whereby, the agent reduces adhesion on a roller, and reduces environmental impact due to reduced fluorine usage.