Colloidal Silica Composition for Stable Bumpy Particle Surfaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing colloidal silica production methods fail to maintain a bumpy surface under basic conditions, leading to reduced abrasiveness and compactness.
Innovation Solution
Colloidal silica with silica particles containing alkoxy groups in a specific range and a reduction in specific surface area under basic conditions, produced using amines as alkaline catalysts with a controlled molar ratio of alkoxysilane to catalyst, maintaining a bumpy surface and high abrasiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If quaternary ammonium salt is used as hydrolysis catalyst to produce silica particles with protrusions, then abrasiveness is improved, but the bumpy surface cannot be maintained under basic conditions
Solution Approach 1:
The invention changes the chemical composition parameters of the silica particles by controlling the hydrolysis and condensation reactions to form alkoxy groups on the particle surface. This compositional modification enables the bumpy surface structure to remain stable under basic conditions while maintaining high abrasiveness, resolving the contradiction between surface stability and abrasive performance
Solution Approach 2:
The invention creates a composite structure on the silica particle surface by incorporating organic alkoxy groups (such as methoxy or ethoxy groups) into the inorganic silica matrix. This composite material approach allows the surface to exhibit both the mechanical properties needed for abrasiveness and the chemical stability required to maintain the bumpy structure under basic conditions
2Manufacturing precision
If silica particles are produced with high compactness, then purity is improved, but the bumpy surface structure becomes difficult to maintain
Solution Approach 1:
The invention applies local quality by creating a differentiated structure where the interior of the silica particles maintains high compactness and purity, while the surface develops a specific bumpy morphology with alkoxy groups. This local differentiation allows the particle core to be dense and pure while the surface exhibits the required bumpy structure that remains stable under basic conditions
Solution Approach 2:
By controlling the hydrolysis and condensation reaction parameters, the invention achieves a specific surface area reduction within the range of 10-30%, which corresponds to the formation of the bumpy surface structure. This parameter control enables simultaneous achievement of high compactness in the particle interior and stable bumpy surface morphology
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 colloidal silica maintains a bumpy surface and high abrasiveness under basic conditions, reducing defects on polished objects and enhancing compactness.
Implementation Method 1
a method for producing a colloidal silica containing silica particles with small protrusions on the surface of the particles by using a quaternary ammonium salt etc. as a hydrolysis catalyst
Implementation Method 2
step 3 of adding water, an alkaline catalyst, and an alkoxysilane to the seed particle dispersion wherein the alkaline catalyst is at least one amine selected from the group consisting of a primary amine, a secondary amine, and a tertiary amine
Data Source
AI summary
The present invention provides colloidal silica containing silica particles excellent in compactness and excellent in maintenance of the bumpy surface under basic conditions, and provides a method for producing the colloidal silica. The present invention provides colloidal silica containing silica particles having a bumpy surface, wherein (1) the silica particles have a content of alkoxy groups of 1000 ppm or more, and (2) the silica particles have a reduction in specific surface area of 15.0% or less when the silica particles are heated under basic conditions.