Fluorinated Organopolysiloxane Coating for Substrate Adhesion and Scrub Resistance
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Solution Overview
Problem
Existing surface treatment compositions with fluorinated moieties lack strong bonding to substrates and are not resistant to scrubbing, water, and oil, making them unsuitable for applications requiring durability and easy cleaning.
Innovation Solution
An organopolysiloxane with a fluorine-containing moiety and hydrolyzable groups integrated into its backbone, forming a coating layer that provides strong bonding to substrates and enhanced resistance to scrubbing, water, and oil through a specific molecular structure and reaction method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorinated compounds are used for water and oil repellency, then water and oil repellent properties are improved, but bonding strength to substrate deteriorates
Solution Approach 1:
The molecule is divided into distinct functional segments: a fluorinated alkyl group (for water and oil repellency), a polyether chain (for flexibility and bonding), and a silane coupling agent (for substrate bonding). This segmentation allows each part to perform its specific function optimally without compromising the others.
Solution Approach 2:
The invention creates a composite molecular structure combining fluorinated compounds, polyether chains, and silane coupling agents into a single integrated molecule. This composite structure simultaneously provides water and oil repellency (from the fluorinated group), substrate bonding capability (from the silane group), and improved durability (from the polyether chain).
2Reliability
If fluorinated compounds are applied to substrate, then water and oil repellency is achieved, but resistance to scrubbing deteriorates
Solution Approach 1:
The molecule is divided into distinct functional segments: a fluorinated alkyl group (for water and oil repellency), a polyether chain (for flexibility and bonding), and a silane coupling agent (for substrate bonding). This segmentation allows each part to perform its specific function optimally without compromising the others.
Solution Approach 2:
The invention creates a composite molecular structure combining fluorinated compounds, polyether chains, and silane coupling agents into a single integrated molecule. This composite structure simultaneously provides water and oil repellency (from the fluorinated group), substrate bonding capability (from the silane group), and improved durability (from the polyether chain).
3Strength
If silane coupling agent is used for bonding, then bonding strength to substrate is improved, but water and oil repellency deteriorates
Solution Approach 1:
Different parts of the molecule have different local properties: the fluorinated alkyl group provides hydrophobicity and oleophobicity, the polyether chain provides flexibility and bonding, and the silane coupling agent provides substrate adhesion. Each local region performs its specific function to achieve overall performance.
Solution Approach 2:
The invention creates a composite molecular structure combining fluorinated compounds, polyether chains, and silane coupling agents into a single integrated molecule. This composite structure simultaneously provides water and oil repellency (from the fluorinated group), substrate bonding capability (from the silane group), and improved durability (from the polyether chain).
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 organopolysiloxane coating exhibits improved scrub resistance and uniform water and oil repellency, ensuring durability and ease of cleaning, addressing the limitations of previous compounds.
Implementation Method 1
The alkoxy silyl groups are autocondensed in the presence of moisture to form a siloxane film
Implementation Method 2
The alkoxy silyl groups are autocondensed in the presence of moisture to form a siloxane film
Implementation Method 3
Compounds containing perfluoropolyether moieties generally have very small surface free energy to have water and oil repellency
Data Source
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AI summary
An organopolysiloxane represented by the following general formula (A), (B) or (C) SinR12n+2On-1 (A) SinR12nOn (B) SinR12n+2R2kOn-k (C) wherein R1 may be the same with or different from each other and is a hydrogen atom or a monovalent organic group, R2 is an alkylene group having 2 to 6 carbon atoms, n is an integer of from 2 to 40 and k is an integer of 1 to 3, characterized in that at least two R1 's are represented by the following formula (i): wherein X is a hydrolyzable group, R3 is an alkyl group having 1 to 4 carbon atoms or a phenyl group, y is an integer of from 1 to 5 and a is 2 or 3; and one SiR1 bond is represented by the following formula (ii) or one SiOSi bond is replaced with a bond represented by the following formula (iii): SiQRf1 (ii) SiQRf2QSi (iii) wherein Rfl is a monovalent group containing a perfluoroether residue, Rf□ is a divalent group containing a perfluoroether residue, and Q is a divalent organic group.