Coating composition, method for producing same, coating film, exhaust fan and air conditioner
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Solution Overview
Problem
Existing coating compositions fail to achieve adequate super water repellency due to surfactant retention, rapid drying of organic solvents, and poor coating properties on water-repellent surfaces, leading to cracks and defects.
Innovation Solution
A coating composition comprising water, a water-soluble organic solvent with a flash point of 80° C to 200° C, fluorine resin, hydrophilic silica particles, and hydrophobic silica particles, which forms a cohesive layer providing adhesion and relief structures for enhanced water repellency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If organic solvents with rapid drying speed are used, then productivity is improved, but cracks and defects occur in the coating film
Solution Approach 1:
The patent changes the physical and chemical parameters of the solvent system by using a water-based formulation with specific water-soluble organic solvents having controlled boiling points (70-150°C). This parameter adjustment allows for controlled evaporation rates that prevent crack formation while maintaining reasonable drying speed, resolving the contradiction between productivity and coating quality.
2Reliability
If coating is applied on water-repellent surfaces, then existing water repellency is preserved, but coating adhesion deteriorates
Solution Approach 1:
The patent applies local quality differentiation by using hydrophilic silica particles specifically for adhesion promotion and hydrophobic silica particles for water repellency. This spatial and functional separation allows the coating to simultaneously achieve strong adhesion on water-repellent surfaces and maintain super water repellency properties.
Solution Approach 2:
The hydrophilic silica particles act as an intermediary between the substrate and the hydrophobic components. They provide anchoring points for coating adhesion while the hydrophobic silica particles and fluorine resin maintain the water-repellent surface properties, thus mediating between adhesion requirements and water repellency preservation.
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 coating composition effectively forms a crack-free, durable film with excellent super water repellency and anti-fouling properties, suitable for various applications including exhaust fans and air conditioners, even in high-humidity environments.
Implementation Method 1
hydrophobic silica particles which form a relief structure on the surface of the coating film
Implementation Method 2
hydrophilic silica particles; The coating film is composed of lipophilic silica particles, hydrophobic silica particles and a fluorine resin
Data Source
AI summary
Provided is a coating composition containing: water; a water-soluble organic solvent that has a flash pint of at least 80° C. and not more than 200° C. and dissolves a fluorine resin; a fluorine resin; hydrophilic silica particles; and hydrophobic silica particles. The hydrophilic silica particles are preferably contained in the coating composition in an amount of at least 0.001 mass % and not more than 1 mass %. The average particle diameter of the hydrophilic silica particles is preferably at least 5 nm and not more than 30 nm.