H-Form Inorganic Nano-Platelets Dispersion in Organic Solvents
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for forming organic dispersions of silica platelets are limited by the need for additives like quaternary ammonium salts and hydrophilic polymers, which reduce the inorganic content, stability, and processability, and result in opaque and water-limited dispersions.
Innovation Solution
An ion-exchange process is used to convert metal cations of inorganic nano-platelets to hydrogen ions, allowing for direct dispersion in organic solvents without additives, maintaining platelet shape and size, and achieving high solid content and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional methods using quaternary ammonium salts and hydrophilic polymers are used to disperse silica platelets in organic solvents, then the silica platelets can be dispersed, but the inorganic content is reduced and the stability and processability deteriorate
Solution Approach 1:
The patent removes harmful additives (quaternary ammonium salts and hydrophilic polymers) from the dispersion system through ion-exchange processing. The metal cations on silica platelet surfaces are exchanged with hydrogen ions, eliminating the need for stabilizing additives and achieving pure inorganic content while maintaining colloidal stability in organic solvents.
Solution Approach 2:
The patent changes the surface charge parameter of silica platelets by converting metal cations to hydrogen ions through ion-exchange. This parameter change transforms the surface properties, enabling direct dispersion in organic solvents without requiring hydrophilic polymers or quaternary ammonium salts, thus maintaining high inorganic content and improved stability.
2Adaptability or versatility
If conventional methods are used to form silica platelet dispersions, then dispersion is achieved, but the dispersion becomes opaque and limited to water-based systems
Solution Approach 1:
The patent inverts the conventional approach by making silica platelets hydrophobic through hydrogen ion exchange, enabling them to disperse in organic solvents rather than water. This inversion transforms the dispersion system from water-based to organic-solvent-based, achieving both transparency and broad solvent compatibility including toluene, xylene, and other organic polymers.
3Shape
If NaOH is added repeatedly to form silica platelets, then platelet formation is achieved, but the process stability is reduced
Solution Approach 1:
The patent performs preliminary ion-exchange processing to convert metal cations to hydrogen ions before dispersion. This preliminary action stabilizes the platelet structure and surface charge, eliminating the need for repeated NaOH addition during subsequent processing steps, thereby improving overall process stability and repeatability.
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 process results in a stable, transparent organic dispersion of inorganic nano-platelets with high thermal resistance and solubility in organic polymers, enhancing the applicability and storage stability of the material.
Implementation Method 1
performing an ion-exchange procedure to the inorganic nano-platelets by adding an ion-exchange resin thereto, for forming an aqueous dispersion of an H-form inorganic nano-platelets
Implementation Method 2
adding the aqueous dispersion of an H-form inorganic nano-platelets into a mixture of a first organic solvent and a second organic solvent
Data Source
AI summary
Disclosed is an organic dispersion of inorganic platelets, which includes an organic solvent and H-form inorganic platelets dispersed therein. The H-form inorganic platelets have a particle size of between about 20 and 80 nm and the organic dispersion has a sold content of between about 1 and 20 wt %. A method for forming the organic dispersion is also provided.