Moisture-Curable Fluorinated Coatings for Adhesion and Hardness
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Solution Overview
Problem
Conventional protective coatings with high fluorine content for moisture, chemical, and graffiti resistance often compromise on hardness and durability, necessitating the development of new materials for substrates that offer improved adhesion and durability without requiring additional primers.
Innovation Solution
A moisture-curable composition is developed through free-radical copolymerization of specific monomers, incorporating fluorinated segments to create a polymer with low-surface-energy properties, excellent water and oil repellency, and good adhesion to various substrates, eliminating the need for primers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high fluorine content is used in protective coatings, then moisture, chemical, and graffiti resistance is improved, but hardness and durability are worsened
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating silane-functional groups with specific structures (where m=0-5 and R3 contains hydrolyzable groups) to achieve a balance between fluorine content and mechanical properties. This parameter optimization allows the coating to maintain both repellency and hardness without requiring high fluorine concentrations
Solution Approach 2:
The patent creates a composite coating system combining organosilane compounds with fluorinated polymers. The silane component provides mechanical strength and adhesion through crosslinking, while the fluorinated segments provide repellency, achieving a synergistic effect that resolves the contradiction between durability and chemical resistance
2Reliability
If high fluorine content is used in protective coatings, then repellency is improved, but adhesion to substrates is worsened
Solution Approach 1:
The patent applies local quality by creating distinct functional zones within the coating: the silane-functional groups provide strong substrate adhesion at the interface, while the fluorinated segments concentrated in other regions provide repellency. This spatial differentiation of functions allows both adhesion and repellency to excel without compromising either property
3Reliability
If conventional organofluorine-based protective coatings are applied, then repellency is achieved, but additional primers are required for improved adhesion
Solution Approach 1:
The patent merges the functions of adhesion promotion and repellency provision into a single integrated coating composition. The silane-functional groups inherently provide both substrate bonding capability and film formation, eliminating the need for separate primer layers while maintaining excellent adhesion and repellency performance
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 provides durable and adhesive protective coatings with enhanced repellency and mechanical resistance, suitable for a wide range of substrates without the need for additional primers, balancing repellency and durability effectively.
Implementation Method 1
a polymer preparable by free-radical copolymerization of monomers comprising at least one monomer A and at least one monomer B
Implementation Method 2
moisture-curable composition comprising a polymer preparable by free-radical copolymerization
Implementation Method 3
moisture-curable composition comprising a polymer preparable by free-radical copolymerization of monomers comprising at least one monomer A and at least one monomer B
Implementation Method 4
Because of the incorporation of fluorinated segments, the protective coatings have low-surface-energy properties such as excellent water, oil, and stain repellency
Data Source
Figure 1
AI summary
A moisture-curable composition includes a polymer preparable by free-radical copolymerization of monomers comprising at least one monomer A and at least one monomer B. Monomer(s) A comprise free-radically polymerizable hydrolyzable silane. Monomer(s) B include a divalent group selected from the group consisting of -(CF2O)a-, -(CF2CF2O)b-, -(CF2CF2CF2O)c-, -(CF2CF2CF2CF2O)d-, -(CF2CF(CF3)O)e-, and combinations thereof, wherein a, b, c, d, and e represent integers in the range of from 0 to 130, and wherein 1 ≤ < a + b + c + d + e ≤ 130. A composite article includes a layer of a composition on a substrate. The composition comprises a cross- linked reaction product of components including the moisture-curable composition. Methods of making the composite article are also disclosed.