Fluorine-Acrylic Composite Coating for Adhesion and Water Resistance
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Solution Overview
Problem
Current fluorine coating materials exhibit insufficient adhesion to substrates and water resistance, despite advancements in improving adhesion, further enhancements are needed for both properties.
Innovation Solution
An aqueous dispersion containing fluorine-containing composite polymer particles with specific monomer units and an inorganic silicon compound, optimized acid value, and particle size, which are produced through a polymerization process involving vinylidene fluoride and acrylic monomers, to enhance adhesion and water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorine coating materials are used to achieve water resistance and weather resistance, then water resistance and weather resistance are improved, but adhesion to substrate deteriorates
Solution Approach 1:
The patent uses composite polymer particles containing both fluoropolymer and acrylic polymer components. The fluoropolymer provides water and weather resistance, while the acrylic polymer (containing carboxyl groups) provides adhesion to substrate. This composite structure resolves the contradiction by combining materials with complementary properties in a single coating system.
Solution Approach 2:
The patent introduces local quality by incorporating carboxyl groups specifically in the acrylic polymer component of the composite particles. This creates localized adhesive functional groups that interact with the substrate, while the fluoropolymer component maintains its water-resistant properties. The different regions of the coating perform different functions to resolve the adhesion-water resistance contradiction.
2Ease of manufacture
If conventional polymerization methods are used to simplify production, then ease of manufacture is improved, but adhesion and water resistance deteriorate
Solution Approach 1:
The patent uses seed polymerization where pre-formed fluoropolymer particles serve as seeds. The acrylic monomers are then polymerized on these pre-formed seeds, allowing the adhesive acrylic component to be incorporated into the water-resistant fluoropolymer structure in a controlled two-stage process. This preliminary action enables both good adhesion and water resistance while maintaining manufacturing feasibility.
Solution Approach 2:
The patent segments the polymerization process into two distinct stages: first forming fluoropolymer seed particles, then growing acrylic polymer on these seeds. This segmentation allows independent optimization of each polymer component's properties while maintaining a relatively simple overall production process that achieves both adhesion and water resistance.
3Strength
If adhesion is improved through conventional methods, then adhesion to substrate is improved, but water resistance deteriorates
Solution Approach 1:
The composite polymer particle structure allows simultaneous presence of adhesive acrylic polymer and water-resistant fluoropolymer in the same coating film. The acrylic component (with carboxyl groups) provides adhesion, while the fluoropolymer component maintains water resistance, resolving the contradiction between these two properties.
Solution Approach 2:
The patent changes the chemical composition parameters of the composite particles by incorporating carboxyl groups from acrylic monomers. This parameter change (adding polar carboxyl functional groups) enhances adhesion without compromising water resistance because the fluoropolymer component maintains its hydrophobic character. The dual-component composition allows independent optimization of adhesion and water resistance parameters.
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 resulting coating film demonstrates excellent adhesion and water resistance, with improved durability and performance under various environmental conditions.
Implementation Method 1
a polymerization initiator and an acrylic monomer are added to an aqueous dispersion containing particles of a polymer (A) with a repeating unit of vinylidene fluoride; and the acrylic monomer is polymerized
Data Source
AI summary
The present invention aims to provide an aqueous dispersion capable of forming a coating film that has excellent adhesion to a substrate and excellent water resistance. The aqueous dispersion of the present invention includes fluorine-containing composite polymer particles of a polymer (A) with a repeating unit of vinylidene fluoride and a polymer (B) with a repeating unit of at least one acrylic monomer selected from the group consisting of acrylic acid, acrylic acid esters, methacrylic acid, and methacrylic acid esters, the dispersion having an acid value of at least 3 mgKOH/g.