Coating Composition Synergistic Silver Ruthenium Preservatives
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Solution Overview
Problem
Conventional coating compositions face challenges with storage stability against microbial infestation, as chemical preservatives have toxicity and regulatory issues, while alternative methods like increasing pH or using silver compounds result in effectiveness failures, color changes, and high active ingredient requirements.
Innovation Solution
A pasty coating composition combining low concentrations of classic chemical in-can preservatives (TKM) with a silver/ruthenium active ingredient, achieving synergistic microbiocidal effects at significantly lower concentrations than previous methods, without the drawbacks of color changes or regulatory concerns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chemical in-can preservatives (TKM) are used to prevent microbial infestation, then storage stability is improved, but toxicity and sensitizing properties increase causing health and environmental hazards
Solution Approach 1:
The patent changes the chemical parameters by using silver and ruthenium compounds at extremely low concentrations (0.001-0.5 wt% and 0.001-0.1 wt% respectively) instead of conventional TKM preservatives. This parameter change maintains microbiocidal effectiveness while eliminating the toxic and sensitizing properties associated with traditional chemical preservatives.
Solution Approach 2:
The patent replaces expensive, hazardous TKM preservatives with cheaper, safer metal compounds (silver and ruthenium) that provide equivalent or superior preservation效果. The metal compounds act as effective preservatives without the harmful side effects, making them a superior replacement despite the noble metal status of silver and ruthenium.
2Object-affected harmful factors
If pH is increased to prevent microbial infestation without conventional preservatives, then preservative effectiveness is reduced, but chemical preservative usage is eliminated
Solution Approach 1:
The patent creates a composite preservation system combining silver compounds (0.001-0.5 wt%) and ruthenium compounds (0.001-0.1 wt%) that work synergistically to provide reliable microbiocidal protection. This composite approach eliminates the need for high pH adjustment while maintaining superior preservative effectiveness compared to pH-based methods alone.
3Reliability
If silver compounds are used for preservation, then microbiocidal effect is achieved, but gray color changes occur and high concentrations are required
Solution Approach 1:
The patent dramatically reduces the silver compound concentration to 0.001-0.5 wt%, which is sufficiently low to prevent gray coloration while maintaining effective microbiocidal protection. This parameter reduction resolves the color issue while preserving the preservative function.
Solution Approach 2:
The patent combines silver compounds with ruthenium compounds in a synergistic formulation. This combination allows for reduced concentrations of both metals while enhancing the microbiocidal effect, thereby preventing color changes even more effectively while maintaining superior preservation.
4Reliability
If conventional TKM preservatives are used, then wide range of microbiocidal effects is achieved, but active ingredient content must be reduced due to regulations
Solution Approach 1:
The patent changes the preservative system from conventional TKM chemicals to metal compounds (silver and ruthenium) that provide equivalent or superior microbiocidal protection at lower concentrations. This parameter change allows compliance with decreasing active ingredient regulations while maintaining effective 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 composition provides reliable long-term biocidal effectiveness, reduced allergenic potential, and no emissions, maintaining stability and color integrity, with lower active ingredient usage compared to traditional methods.
Implementation Method 1
a preservative against microbial infestation which contains at least two antimicrobial active ingredients, wherein at least one of these active ingredients is a TKM
Data Source
AI summary
A storage-stable composition for the formation of coatings on buildings and the like, comprising at least one organic binder, at least one filler and/or pigment, at least one preservative against microbial attack, which contains at least two different active ingredients, one of which is a chemical in-can preservative (TCP) and the other of which is a particulate-carried active ingredient with elements of silver and ruthenium; water to achieve a pasty consistency of the composition and, if necessary, customary additives.