Coated Particle Dispersion via Catechol Copolymer
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Solution Overview
Problem
Particles with low surface free energy face difficulty in dispersion in aqueous solvents due to large differences in surface free energy, and existing solutions using fluorochemical surfactants raise concerns about bioaccumulation and environmental persistence.
Innovation Solution
A coated particle with a copolymer comprising a hydrophilic monomer and a catechol group monomer is used, allowing particles with low surface free energy to be dispersed in an aqueous solvent without fluorochemical surfactants, leveraging the hydrophilic group's affinity with water and the catechol group's adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fluorochemical surfactant is used to disperse PTFE particles in aqueous solvent, then dispersion is achieved, but environmental persistence and bioaccumulation problems occur
Solution Approach 1:
The invention changes the chemical composition parameters of the surfactant from fluorochemical to carboxylic acid-based compounds. Specifically, it uses carboxylic acids with 12 or more carbon atoms (such as lauric acid, myristic acid, palmitic acid, stearic acid) or their salts, which provide effective dispersion of PTFE particles in aqueous solvents without the environmental persistence and bioaccumulation issues associated with fluorochemical surfactants.
Solution Approach 2:
The invention replaces persistent fluorochemical surfactants with biodegradable carboxylic acid-based surfactants. These carboxylic acids and their salts are environmentally friendly, readily biodegradable, and do not accumulate in the environment, effectively solving the environmental persistence problem while maintaining dispersion functionality.
2Object-affected harmful factors
If PTFE particles are dispersed in aqueous solvent without surfactant, then environmental safety is improved, but dispersion stability deteriorates due to aggregation
Solution Approach 1:
The invention introduces carboxylic acid-based compounds as intermediary substances between PTFE particles and aqueous solvent. These carboxylic acids (with 12 or more carbon atoms) or their salts act as mediators that reduce surface tension and improve wetting, enabling stable dispersion of hydrophobic PTFE particles in water without using harmful fluorochemical surfactants.
Solution Approach 2:
The invention creates a composite dispersion system consisting of PTFE particles, carboxylic acid-based surfactant (or its salt), and aqueous solvent. This composite approach combines the hydrophobic PTFE particles with the amphiphilic carboxylic acid surfactant molecules, where the surfactant forms a protective interface layer that prevents particle aggregation and ensures stable dispersion.
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 copolymer effectively coats particles, enabling stable dispersion in aqueous solvents, reducing aggregation, and providing a non-persistent alternative to fluorochemical surfactants for applications like electrode materials and coatings.
Implementation Method 1
a copolymer in which a monomer including a hydrophilic group except for catechol groups and a monomer including at least a catechol group are copolymerized, wherein the particle is coated with the copolymer
Implementation Method 2
a monomer including a hydrophilic group except for catechol groups... the copolymer effectively coats particles, enabling stable dispersion in aqueous solvents
Data Source
AI summary
Provided are a coated particle that enables particles with low surface free energy to be dispersed in an aqueous solvent without using a fluorochemical surfactant, a dispersion solution, a dispersion method of coated particles, a coating film, a manufacturing method of a coating film, and a copolymer. A coated particle has: a particle with surface free energy of 50 mJ/m2 or less; and a copolymer in which a monomer including a hydrophilic group except for catechol groups and a monomer including at least a catechol group are copolymerized, and the particle is coated with the copolymer.