Surface-Modified Pyrogenic Silica for Liquid Thickening
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Solution Overview
Problem
Existing surface-modified pyrogenic silicas have unsatisfactory ease of incorporation into liquid systems, which is a critical issue in applications like controlling rheology and adhesives, as they compromise the thickening effect.
Innovation Solution
Surface-modified pyrogenically prepared silica aggregates with specific BET surface area and size characteristics are treated with surface modifiers using various methods, including spraying and thermal treatment under inert gas, to enhance incorporation without affecting thickening properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If surface modification is applied to pyrogenic silica, then ease of incorporation into liquid systems is improved, but thickening effect is compromised
Solution Approach 1:
The patent applies parameter changes by carefully controlling the surface area of pyrogenic silica particles (150-250 m²/g) and selecting specific surface modifiers (organosilanes, haloorganosilanes, silazanes, cyclic polysiloxanes, or polysiloxanes) to achieve optimal balance between ease of incorporation and thickening effect. The surface modification parameters are precisely tuned to resolve the contradiction.
Solution Approach 2:
The patent creates composite materials by combining pyrogenic silica with organic surface modifiers to produce surface-modified pyrogenic silica. This composite structure allows the silica core to maintain thickening properties while the surface coating improves ease of incorporation into liquid systems.
2Ease of operation
If surface modification is applied to pyrogenic silica, then ease of incorporation into liquid systems is improved, but other important properties are compromised
Solution Approach 1:
The patent maintains reliability by controlling key parameters including surface area (150-250 m²/g), particle size distribution, and surface modifier concentration. These parameter controls ensure that essential properties like thermal stability, chemical resistance, and rheological performance are preserved while improving ease of incorporation.
Solution Approach 2:
The patent applies local quality by modifying only the surface region of pyrogenic silica particles while leaving the core structure intact. This selective surface modification approach improves ease of incorporation without compromising the bulk properties and reliability of the silica.
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 modified silica exhibits improved ease of incorporation into liquid systems while maintaining the thickening effect, as demonstrated by faster homogenization and comparable physicochemical data.
Implementation Method 1
Surface modification can be accomplished by spraying the silicas where appropriate with water and subsequently with the surface modifier
Implementation Method 2
The mixture is subsequently treated thermally at a temperature of 20 to 400°C over a period of 0.1 to 6 h
Implementation Method 3
The thermal treatment may take place under inert gas, such as nitrogen, for example
Data Source
AI summary
Surface-modified, pyrogenically prepared silica is prepared by subjecting the pyrogenically prepared silica, which is in the form of aggregates of primary particles and possesses a BET surface area of 200 ± 25 m2/g, the aggregates having an average area of 7000 to 12 000 nm2, an average equivalent circle diameter (ECD) of 80 to 100 nm and an average circumference of 850 to 1050 nm, to surface- modification in a known way. It can be used for thickening liquid systems.