Fluoropolymer Coating Composition With Antifouling Side Chains
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Solution Overview
Problem
Conventional fluorine-containing polymers used in building materials lack sufficient antifouling properties despite their excellent weather resistance and chemical resistance.
Innovation Solution
A modified polymer is developed with a main chain containing a fluorine-containing polymer and specific side chains, such as —CH2—CRb1(—X)—C(═O)—Y—Z—Rf and —CH2—CRb2(—R1)—C(═O)—O—Si(—CH3)2—[O—Si(—CH3)2]n—O—Si(—CH3)2—R2, which enhance antifouling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorine-containing polymers are used in building materials, then weather resistance is improved, but antifouling properties are insufficient
Solution Approach 1:
The patent applies local quality by introducing specific side chains (formula b1 and b2) containing fluoroalkyl groups and siloxane structures at specific positions on the polymer chain. This creates local regions with enhanced antifouling characteristics while preserving the overall weather resistance provided by the fluorine-containing main chain. The side chains are strategically positioned to provide both water repellency and stain resistance without compromising the main chain's durability.
Solution Approach 2:
The patent employs composite material principles by combining fluorine-containing polymer segments with siloxane-containing side chains in a single copolymer structure. This composite approach integrates the weather resistance benefits of fluorinated polymers with the antifouling properties of siloxane groups, achieving both required functionalities within one material system rather than requiring separate coatings or treatments.
2Reliability
If conventional fluorine-containing polymers are used, then chemical resistance is maintained, but antifouling performance is inadequate
Solution Approach 1:
The patent introduces siloxane-containing side chains at specific locations on the polymer backbone to create local regions with enhanced antifouling performance. These side chains contain C—F bonds with high bond energy and low polarizability, providing both chemical resistance and antifouling properties at the molecular level while maintaining the overall chemical stability of the polymer structure.
Solution Approach 2:
The patent modifies the chemical parameters of the fluorine-containing polymer by incorporating side chains with specific fluorine content and siloxane structures. This changes the surface energy and wettability parameters of the polymer, enhancing antifouling performance while maintaining the chemical resistance provided by the stable C—F bonds in the main chain and side chains.
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 modified polymer exhibits improved antifouling properties while maintaining excellent weather resistance and chemical resistance.
Implementation Method 1
Fluorine-containing polymers have high bond energy and low polarizability of C—F bonds in the molecule and are therefore excellent in properties such as weather resistance
Implementation Method 2
Fluorine-containing polymers have high bond energy and low polarizability of C—F bonds in the molecule
Data Source
AI summary
A modified polymer including (a) a main chain containing a fluorine-containing polymer and (b) a side chain represented by the following formula (b1′) and/or a side chain represented by the following formula (b2′). The formula (b1′) is —CH2—CRb1(—X)—C(═O)—Y—Z—Rf, wherein X is a hydrogen atom, a methyl group, or a halogen atom; Y is —O— or —NH—; Z is a direct bond or a divalent organic group; Rf is a C1-C20 fluoroalkyl group; and Rb1 is a hydrogen atom or a monovalent organic group. The formula (b2′) is —CH2—CRb2(—R1)—C(═O)—O—Si(—CH3)2—[O—Si(—CH3)2]n—O—Si(—CH3)2—R2, wherein R1 is a hydrogen atom or a methyl group; R2 is a hydrogen atom or a methyl group; Rb2 is a hydrogen atom or a monovalent organic group; and n is 3 to 200.