Silica Sol Production via Multi-Liquid Segmentation
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Solution Overview
Problem
Conventional methods for producing silica sols face challenges in achieving consistent particle size uniformity and high concentration, leading to variability in silica particle sizes and reduced productivity.
Innovation Solution
A method involving a multi-liquid reaction process, where liquid (A) containing an alkaline catalyst, water, and a first organic solvent is mixed with liquid (B) containing an alkoxysilane or its condensate and a second organic solvent, and liquid (C) with a pH of 5.0 to 8.0 or without an alkaline catalyst, to regulate the reaction conditions and achieve uniform particle sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a 3 liquid reaction type method is used to highly concentrate silica particles, then productivity is improved, but particle size uniformity deteriorates
Solution Approach 1:
The reaction system is segmented into multiple distinct liquid phases (aqueous phase containing catalyst, organic phase containing alkoxysilane, and additional aqueous phase for pH control) that are mixed in specific sequences. This segmentation allows independent optimization of each phase's function while maintaining overall reaction control, enabling both high concentration and uniform particle size.
Solution Approach 2:
The invention controls particle size uniformity by precisely adjusting pH parameters (maintaining pH 5.0-8.0 in one embodiment) and catalyst concentration parameters. By changing these physical-chemical parameters within specific ranges, the reaction proceeds uniformly throughout the concentrated silica particle suspension, achieving both high concentration and size uniformity.
2Manufacturing precision
If ion exchange purification is applied to increase starting material purity, then silica sol purity is improved, but process complexity increases
Solution Approach 1:
The invention extracts and eliminates the need for complex ion exchange purification by selecting high-purity alkoxysilane starting materials and conducting the hydrolysis reaction in a controlled multi-phase system. The organic solvent phase separates from the aqueous phase, naturally extracting and removing impurities, thereby achieving high purity silica sol without requiring ion exchange resins or additional purification equipment.
3Device complexity
If 2 liquid reaction type method is used, then process simplicity is maintained, but silica sol concentration is limited
Solution Approach 1:
The invention merges the advantages of multiple reaction approaches by combining the simplicity of 2-liquid mixing with the concentration benefits of 3-liquid systems. Specifically, it merges the organic phase containing alkoxysilane with two separate aqueous phases (one providing catalyst, one providing pH control), creating a unified reaction system that achieves high silica sol concentration while maintaining operational simplicity through a single mixing step.
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
This approach consistently produces silica sols with uniform particle sizes and high concentration, enhancing productivity and allowing for the regulation of particle size distribution.
Implementation Method 1
addition of a liquid containing an alkoxysilane and an organic solvent to a liquid containing an alkaline catalyst, water, and an organic solvent
Implementation Method 2
liquid (A) containing an alkaline catalyst, water, and a first organic solvent
Data Source
AI summary
[Problem] Provided is a method for producing a silica sol capable of providing consistent production of the silica sol having a uniform particle size of silica particles in any particle size of the silica particles.[Solution] A method for producing a silica sol is a method including a step of mixing liquid (A) containing an alkaline catalyst, water, and a first organic solvent with liquid (B) containing an alkoxysilane or its condensate and a second organic solvent, and liquid (C1) having a pH of 5.0 or higher and lower than 8.0 and containing water or liquid (C2) containing water and being free of an alkaline catalyst to make a reaction liquid.