Core-Shell Coating Composition for Washable Stain Resistance
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Solution Overview
Problem
Aqueous architectural paints and coatings are prone to staining due to everyday traffic, lacking effective stain resistance, adhesion, and ease of stain removal without damaging the coating.
Innovation Solution
A coating composition comprising an aqueous dispersion of self-crosslinkable core-shell particles with a polymeric core encapsulated by a polymeric shell containing urethane linkages, keto and/or aldo functional groups, and hydrazide functional groups, combined with an acrylic polymer non-reactive to the core and shell, enhances stain resistance by forming a durable and washable film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional aqueous architectural paints are used, then the coating provides basic coverage and aesthetic appearance, but the coating lacks effective stain resistance and becomes stained by everyday traffic
Solution Approach 1:
The patent uses core-shell particles with a polymeric core encapsulated by a polymeric shell containing keto and/or aldo functional groups. This composite structure combines the properties of both core and shell materials to achieve enhanced stain resistance while maintaining coating integrity and washability.
Solution Approach 2:
The patent modifies the chemical composition parameters of the coating by incorporating specific functional groups (keto and/or aldo) in the polymeric shell and using crosslinkers with complementary functionality. These parameter changes enable the coating to resist staining and facilitate easy stain removal.
2Reliability
If the coating is made more resistant to staining, then stain resistance improves, but the ease of stain removal without damage to the coating may be compromised
Solution Approach 1:
The patent carefully selects and balances the functional groups in the polymeric shell (keto and/or aldo) with complementary crosslinkers to achieve optimal crosslinking density. This parameter optimization ensures the coating is sufficiently resistant to staining while remaining washable and allowing easy stain removal without damage.
Solution Approach 2:
The polymeric shell with specific functional groups provides localized stain resistance at the coating surface, while the underlying structure maintains flexibility and washability. This local quality differentiation allows the coating to resist staining where needed while remaining easy to clean.
3Strength
If crosslinking is increased to improve durability and washability, then coating integrity improves, but the coating may become less flexible and more prone to cracking
Solution Approach 1:
The patent optimizes the crosslinking parameters by selecting crosslinkers with specific functionality that match the keto and/or aldo groups in the polymeric shell. This controlled crosslinking approach achieves sufficient durability and washability while maintaining coating flexibility through careful parameter selection.
Solution Approach 2:
The core-shell particle structure with polymeric core and functionalized polymeric shell creates a composite material that balances crosslinking density. The core provides structural support for durability while the shell with flexible polymeric chains maintains coating flexibility despite crosslinking.
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 composition improves stain resistance by providing a durable, washable coating that resists staining and facilitates easy stain removal, maintaining the integrity of the substrate.
Implementation Method 1
the polymeric core is covalently bonded to at least a portion of the polymeric shell
Implementation Method 2
self-crosslinkable core-shell particles... polymeric shell having urethane linkages, keto and/or aldo functional groups, and hydrazide functional groups
Data Source
AI summary
A coating composition including: an aqueous dispersion of self-crosslinkable core-shell particles, where the core-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 an acrylic polymer, where the acrylic polymer 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 of improving stain resistance of a substrateare also disclosed.