Fluoropolymer Coating Composition With Side Chains for Antifouling
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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, including units like —CHR—, 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 (containing fluorinated alkyl groups and hydrocarbon chains) at particular positions on the polymer backbone. This creates regions with different surface energies and chemical compositions, where the fluorinated segments provide weather resistance while the hydrocarbon segments contribute to antifouling properties, thus resolving the contradiction between these two requirements.
Solution Approach 2:
The patent employs composite material principles by combining fluorine-containing polymer chains with specific side chain structures (formula 1 and formula 2) into a modified polymer system. The composite structure integrates the weather resistance of fluorinated backbones with the antifouling characteristics of hydrocarbon side chains, achieving both properties simultaneously in a single material system.
2Reliability
If conventional fluorine-containing polymers are used, then chemical resistance is maintained, but antifouling performance is lacking
Solution Approach 1:
The patent introduces side chains with specific fluorinated alkyl groups (Rf in formula 1) and hydrocarbon chains (R1-R6 in formulas 1 and 2) at localized positions on the polymer backbone. This creates surface regions with tailored chemical properties where fluorinated segments maintain chemical resistance while hydrocarbon segments provide antifouling performance through their hydrophobic characteristics.
Solution Approach 2:
The patent modifies the chemical parameters of the fluorine-containing polymer by controlling the side chain structure, including the fluorinated alkyl group length (C1-C20), hydrocarbon chain length (n=3-200), and substituent types (X, Y, Z, Rb1, Rb2). These parameter changes optimize the balance between chemical resistance and antifouling performance by adjusting surface energy and molecular packing.
Data Source
AI summary
A modified polymer including a main chain containing (a) a fluorine-containing polymer, containing a unit represented by —CHR—, where R is H or a monovalent organic group, and containing a polymerized unit based on tetrafluoroethylene or chlorotrifluoroethylene; and a side chain based on (b) a monomer represented by formula (bl) and/or a monomer represented by formula (b2), the modified polymer obtainable by reacting the fluorine-containing polymer and the monomer(s) in an organic solvent in the presence of a radical polymerization initiator; where (b1) is CH2═C(—X)—C(═O)—Y—Z—Rf (where X is H, methyl group, or halogen; Y is —O— or —NH—; Z is direct bond or divalent organic group; and Rf is a C1-C20 fluoroalkyl group), and where (b) is CH2═C(—R1)—C(═O)—O—Si(—CH3)2—[O—Si(—CH3)2]n—O—Si(—CH3)2—R2 (where R1 is H or methyl group; R2 is H or methyl group; and n is 3 to 200).