Bumpy Colloidal Silica Composition for Stable Abrasiveness
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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 a quaternary ammonium salt is used as a 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 patent changes the chemical composition parameters of the silica particles by controlling the hydrolysis reaction to retain alkoxy groups (100-10000 ppm) on the particle surface. This compositional modification allows the bumpy surface structure to be maintained under basic conditions while preserving abrasiveness, resolving the contradiction between surface stability and abrasive performance
Solution Approach 2:
The patent creates a composite structure on the silica particle surface by combining silica with organic alkoxy groups. This composite material approach forms a stable surface layer that maintains the bumpy morphology under basic conditions while providing the necessary abrasive characteristics
2Strength
If silica particles are produced with a bumpy surface to enhance abrasiveness, then abrasiveness is improved, but the particles tend to aggregate and lose compactness
Solution Approach 1:
The patent optimizes the specific surface area reduction parameter (10-30%) as an indicator of particle compactness. By controlling this parameter along with alkoxy group content, the patent achieves a balance where particles maintain both bumpy surface for abrasiveness and appropriate compactness to prevent aggregation
Solution Approach 2:
The patent applies local quality by creating bumpy protrusions only on the particle surface while maintaining a compact core structure. This localized bumpy structure provides abrasiveness without causing overall particle aggregation, as the compact interior provides structural stability
3Shape
If the specific surface area reduction is increased to improve compactness, then compactness is improved, but the bumpy surface maintenance under basic conditions deteriorates
Solution Approach 1:
The patent identifies the optimal parameter range for specific surface area reduction (10-30%) that simultaneously achieves both compactness and bumpy surface stability under basic conditions. This parameter optimization resolves the contradiction by finding the balance point where further increases in compactness would compromise surface 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 colloidal silica maintains a bumpy surface and high abrasiveness under basic conditions, enhancing its compactness and effectiveness as an abrasive.
Implementation Method 1
the alkaline catalyst is at least one amine selected from the group consisting of a primary amine, a secondary amine, and a tertiary amine
Implementation Method 2
adding an alkoxysilane to the mother liquor to prepare a seed particle dispersion
Implementation Method 3
adding water, an alkaline catalyst, and an alkoxysilane to the seed particle dispersion
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.