Surface Modified Metal Colloids via Organosilsesquioxane
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Solution Overview
Problem
Existing methods for forming metal colloids lack the ability to create particles with tailored functionality and well-defined functional groups suitable for direct use in functional wet-coating, powder coating, compounding formulations, and inks, often resulting in unsuitable particle size distributions and surface interactions.
Innovation Solution
A method involving the use of organosilsesquioxanes with specific functional groups affine to metal salts, combined with reducing agents like hydrazine or ascorbic acid, to produce surface-modified metal colloids with controlled particle size and functionalization, allowing for tailored surface modification and potential crosslinking with matrices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional reduction processes are used to form metal colloids, then metal particles are produced, but the particles lack tailored functionality and well-defined surface properties
Solution Approach 1:
The patent applies preliminary action by incorporating the organosilsesquioxane surface modification agent into the colloid formation process before the metal particles are fully formed. The organosilsesquioxane is present during reduction and spontaneously deposits onto the forming metal particles, ensuring that the surface functionality is built-in from the beginning rather than added as a separate post-treatment step. This resolves the contradiction by achieving both tailored functionality and precise surface properties through a unified process.
Solution Approach 2:
The organosilsesquioxane acts as an intermediary substance that mediates between the metal salt precursor and the final metal colloid. During the reduction process, the organosilsesquoxane deposits on the metal particle surface and provides both the functional groups for application-specific performance and the controlled surface properties for stability and dispersibility. This intermediary role simultaneously delivers tailored functionality and precise surface characterization.
2Manufacturing precision
If complex multistep reduction processes are applied to achieve narrow particle size distribution, then particle size control is improved, but the process complexity and cost increase
Solution Approach 1:
The patent merges multiple functions into a single integrated process step. The organosilsesquoxane simultaneously serves as the surface modification agent, the stabilizing agent, and the dispersing agent during the reduction process. By combining these functions into one additive and one process step, the patent achieves narrow particle size distribution and precise surface properties without requiring complex multistep procedures, thus resolving the contradiction between manufacturing precision and process complexity.
Solution Approach 2:
The organosilsesquoxane exhibits multi-functionality by performing multiple roles: it modifies the particle surface to provide tailored functionality, stabilizes the colloidal dispersion to prevent aggregation, and controls particle size distribution during formation. This universal additive eliminates the need for multiple specialized agents and process steps, achieving high manufacturing precision while maintaining process simplicity.
3Stability of the object's composition
If standard stabilizing agents are used for metal colloids, then colloidal stability is achieved, but the particles cannot be directly used in functional wet-coating, powder coating, compounding formulations, and inks
Solution Approach 1:
The patent applies local quality by providing different functional groups on the organosilsesquoxane molecule at different locations. The silsesquioxane core provides colloidal stability, while the organic R groups provide application-specific functionality such as compatibility with wet-coating, powder coating, compounding formulations, and inks. This local differentiation of properties within the same surface modifier resolves the contradiction by achieving both colloidal stability and broad application suitability simultaneously.
Solution Approach 2:
The organosilsesquoxane creates a composite surface structure on the metal colloids, combining the inorganic silsesquioxane framework that provides colloidal stability with organic functional groups that provide application-specific performance. This composite surface chemistry enables the metal colloids to be directly used in various formulations including wet-coating, powder coating, compounding formulations, and inks while maintaining colloidal stability.
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 method enables the production of metal colloids with defined functionality and surface properties, enhancing their applicability in coatings, inks, and other applications by ensuring precise interaction with substrates and matrices, improving dispersibility and stability.
Implementation Method 1
a method for production of surface modified metal-colloids comprising the following steps: a) mixing at least one metal salt, at least one organosilsesquioxane having at least one functional group affine to the metal of said metal salt and at least one further group; at least one reducing agent and at least one solvent; b) thermal and/or photochemical treatment to induce the reducing of the metal of the metal salt
Implementation Method 2
wherein the at least one organosilsesquioxane in a) (first alternative) is produced, by hydrolysis, wherein prior to complete condensation the condensation is quenched with an excess of water
Data Source
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AI summary
The present patent application is related to formation of functional surface modified metal colloids suitable as master batch for direct use in lacquers, paints, coatings and inks. For this the metal colloids are surface modified with orga-nosilsesquioxanes comprising at least one functional group.