Stable Silica Dispersion Without Stabilizers
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Solution Overview
Problem
Existing colloidal silica dispersions are not stable during storage and transport without a separate stabilizing agent, limiting their application in filling, thickening, and reinforcing organic materials like plastics and rubber.
Innovation Solution
A method involving mixing silanised colloidal silica particles with an organic compound containing at least two hydroxyl groups, followed by water withdrawal to less than 10 wt%, resulting in a stable dispersion with minimal monofunctional alcohol modification of silica particles, which maintains stability without additional stabilizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If colloidal silica dispersion is prepared without separate stabilizing agents, then the complexity of the system is reduced and handling is simplified, but the dispersion becomes unstable during storage and transport
Solution Approach 1:
The silica particles themselves provide stabilization through surface silanol groups that form hydrogen bonding networks, eliminating the need for separate stabilizing agents. The particles stabilize each other through their inherent surface chemistry rather than requiring external additives.
Solution Approach 2:
The patent controls specific parameters including water content (5-50 wt%), monofunctional alcohol content (<10 wt%), and silica particle concentration (20-80 wt%) to achieve stable dispersions without additional stabilizers. These parameter optimizations enable the system to maintain stability through controlled composition rather than complex formulations.
2Stability of the object's composition
If water content is reduced to below 10 wt%, then the dispersion stability and durability are improved, but the manufacturing process becomes more complex requiring water withdrawal operations
Solution Approach 1:
Water withdrawal is performed during the manufacturing process rather than as a post-processing step. The dispersion is prepared with controlled water content from the beginning, and water removal is integrated into the formulation process using evaporation or vacuum drying techniques before final product completion.
3Stability of the object's composition
If monofunctional alcohol modification of silica particles is minimized to less than 10 wt%, then the dispersion stability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges including monofunctional alcohol content (<10 wt%, preferably <5 wt%), water content (5-50 wt%), and silica particle concentration (20-80 wt%). By controlling these parameters within defined ranges rather than requiring exact values, the patent achieves stable dispersions with manageable manufacturing precision requirements.
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 resulting dispersion is stable for extended periods, facilitating handling and application in various materials without the need for on-site preparation and reduces hazardous components, enhancing mechanical strength and durability in polymeric materials.
Implementation Method 1
b) withdrawing water from the aqueous dispersion until the remainder of water in the dispersion is below about 10 wt%
Implementation Method 2
a) mixing an aqueous dispersion of silanised colloidal silica particles with at least one organic compound containing at least two hydroxyl groups
Data Source
AI summary
The present invention relates to a method of producing a dispersion comprising a) mixing an aqueous dispersion of silanised colloidal silica particles with at least one organic compound containing at least two hydroxyl groups to provide an aqueous dispersion of silanised colloidal silica particles and said at least one organic compound, wherein the mixing is performed in the substantial absence of any monofunctional alcohol b) withdrawing water from the formed aqueous dispersion until the remainder of water in the dispersion is below about 10 wt%. The invention also relates to a dispersion obtainable therefrom and the use of the dispersion.