Silane-Free Copolymer Dispersion for Paint Scrub Resistance
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Solution Overview
Problem
Existing polymer-based aqueous binder systems for interior paints face challenges in achieving good wet scrub resistance without compromising molecular weight, storage stability, and color stability, as functionalized silane compounds can reduce molecular weight, interact with other components, and cause yellowing or pH issues.
Innovation Solution
An aqueous copolymer dispersion comprising main monomers, silicon-containing compounds without additional reactive groups, oxirane functional monomers, and auxiliary monomers, which improves wet scrub resistance without the drawbacks of functionalized silanes, such as mercapto, epoxy, or amino groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If functionalized silane compounds (mercapto, epoxy, amino groups) are used to improve wet scrub resistance, then wet scrub resistance is improved, but molecular weight is reduced, storage stability is compromised, and color stability is affected
Solution Approach 1:
The patent extracts and removes the problematic reactive groups (mercapto, epoxy, amino) from the silane compounds, retaining only the silicon-containing backbone structure. This extraction eliminates the harmful side effects (molecular weight reduction, storage instability, yellowing) while preserving the beneficial wet scrub resistance property through the siloxane functionality alone.
Solution Approach 2:
The patent converts the previously harmful reactive groups into beneficial non-reactive siloxane functionalities. The silicon-containing compounds without reactive groups provide wet scrub resistance through their inherent siloxane structure, transforming a potentially harmful chemical reactivity into a stable, beneficial protective effect.
2Reliability
If functionalized silane compounds are used to improve wet scrub resistance, then wet scrub resistance is improved, but storage stability is reduced due to interactions with other formulation components
Solution Approach 1:
The patent removes the reactive functional groups (epoxy, mercapto, amino) that cause unwanted interactions with formulation components like acrylic thickeners. By retaining only the non-reactive siloxane structure, the compound provides wet scrub resistance without compromising storage stability through harmful chemical interactions.
3Reliability
If functionalized silane compounds are used to improve wet scrub resistance, then wet scrub resistance is improved, but color stability is affected due to yellowing and pH changes
Solution Approach 1:
The patent extracts and eliminates the reactive groups (amino, epoxy) that cause color changes and pH modifications. The remaining siloxane structure provides wet scrub resistance without introducing harmful chemical effects that would cause yellowing or alter the coating composition's pH.
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 provides enhanced wet scrub resistance in paint formulations while maintaining molecular weight and stability, avoiding undesirable side effects like yellowing and pH changes, and achieving a high wet scrub class according to EN 13300 standards.
Implementation Method 1
hydrolyzable silane compounds
Data Source
AI summary
Aqueous copolymer dispersions for a variety of uses, including coating compositions or binders for plasters and paints, are disclosed. The aqueous copolymer dispersions may comprise one or more silicon containing compounds, in particular hydrolyzable silane compounds without any additional reactive group.