Coating Composition with Core-Shell Particles for Stain Resistance
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Solution Overview
Problem
Coating compositions for outdoor substrates like wood and concrete often suffer from stain resistance issues, as they easily absorb dirt and materials from their surroundings, leading to difficulty in stain removal without damaging the coating.
Innovation Solution
A coating composition featuring an aqueous dispersion of self-crosslinkable core-shell particles with a polymeric core encapsulated by a shell containing urethane linkages, keto, and hydrazide functional groups, combined with a hydrophobic additive such as wax or a silicon-containing compound, which is applied to the substrate to enhance stain resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional coating compositions are used on outdoor substrates, then the coating provides basic protection, but the coating easily absorbs dirt and materials from surroundings, leading to staining and difficulty in stain removal
Solution Approach 1:
The patent changes the chemical parameters of the coating by incorporating core-shell particles with specific functional groups (carboxyl, hydroxyl, amine) and controlling their surface properties to create a water-repellent surface that resists staining while allowing easy removal of stains without damaging the coating
Solution Approach 2:
The patent uses composite materials by combining conventional coating components with self-crosslinkable core-shell particles that have hydrophobic properties, creating a multi-component system that provides both protection and stain resistance
2Object-affected harmful factors
If the coating forms a water-repellent film to resist staining, then stain resistance improves, but the coating may become more complex in composition
Solution Approach 1:
The core-shell particles are designed to be self-crosslinking, meaning they automatically form the water-repellent network structure without requiring additional crosslinking agents or complex formulation processes, thus achieving stain resistance while maintaining relatively simple composition
Solution Approach 2:
The core-shell particles serve multiple functions simultaneously: they provide water-repellency, form a crosslinked network structure, and maintain coating integrity, reducing the need for separate additives for each function and simplifying the overall composition
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 solution significantly improves stain resistance by forming a durable, water-repellent film that resists staining and facilitates easy stain removal, maintaining the integrity of the substrate.
Implementation Method 1
a hydrophobic additive including a wax and/or a silicon-containing compound, where the hydrophobic additive is non-reactive with the polymeric core and the polymeric shell
Implementation Method 2
where the polymeric core is covalently bonded to at least a portion of the polymeric shell
Data Source
AI summary
A coating composition includes: an aqueous dispersion of self-crosslinkable core-shell particles, where the corm-shell particles include (1) a polymeric core at least partially encapsulated by (2) a polymeric shell having urethane linkages, keto and/or aldo functional groups, and hydrazide functional groups, where the polymeric core is covalently bonded to at least a portion of the polymeric shell, and a hydrophobic additive including a wax and/or a silicon-containing compound, where the hydrophobic additive is non-reactive with the polymeric core and the polymeric shell. A substrate coated with a coating formed from the coating composition and a method for improving stain resistance of a substrate are also disclosed.