Silica sol
Product group | Colloidal silicic acid / silica sols | |
Product name |
| BINDZIL® / LEVASIL® |
Manufacturer |
| eka Chemicals AB / Akzo Nobel Chemicals GmbH / Kurt Obermeier GmbH & Co. KG |
Brief description
The silica sols of the Bindzil® and Levasil® product group are aqueous, solvent-free, low-odour, colloidal solutions of amorphous silicon dioxide (SiO2) with particle sizes of 3 approximately 80 nm.
Because of the special manufacturing process the silica comes in the form of free, non-crosslinked, single spherical particles that have a negative charge in anionic sols, which are stabilised by very small amounts of cations (typically sodium). This is in contrast with the cationic silica sols, which consist of cationic-charged silica sol particles through a specific chemical modification.
Typically, these preparations have a narrow particle size distribution, high density, low viscosity and no discernible separation tendency. In contrast to re-dispersed solids, silica sols manage without the use of auxiliaries such as dispersants, emulsifiers or thickening agents.
While the coarse silica sols present milky cloudy liquids, the finely particled silica sols from about 200 m²/g are relatively clear, opalescent liquids.
The product designation consists of one of the following the number combinations:
- Active content (by weight per cent) / active surface
or - Particle size / active content (in weight per cent).
Examples of:
- Bindzil® 30/360 – silica sol with 360 m²/g of active surface (corresponding to an average particle diameter of about 7 nm) and an active content of 30 weight per cent
- Bindzil® 1430 – silica sol with an average particle diameter of about 14 nm (corresponding to about 250 m²/g of active surface) and an active content of 30 weight per cent
The product designation consists of:
Active surface / active content in weight per cent
e. g.
- Levasil® 50/50% – silica sol with 50 m²/g of active surface (corresponding to an average particle diameter of about 55 nm) and an active content of 50 weight per cent
- Rather coarse, relatively inert types with a high active content
- Character of a reactive filler
- Dulling of surfaces, for example in the field of non-slip finishing of packaging materials
- Polishing agent in special polishing processes
Levasil® 50/50% | Bindzil® 50/80 | Levasil® 100/45% | |
Bindzil® 40/130 | Bindzil® 40/170 |
Special type for use as a binder:
- Levasil® 50M8/50%
- Standard types with average particle sizes, reactivities and active contents
- Reactive binding agent components available for silicate and organic systems, particularly low-sodium types
- Component of refractory materials
- Setting accelerators for cementitious systems
- Thickening agents for gel batteries
Bindzil® 2040 | Levasil® 200/40% | Levasil® 200A/40% | |
Bindzil® 1440 | Levasil® 200/30% | Levasil® 200B/30% | |
Bindzil® 1430 | Bindzil® 1430LS | ||
Bindzil® 30/220 | Bindzil® 40/220 |
- Very finely particled sols with pronounced reactivity and low to medium active contents
- Typically, water-white, opalescent preparations
- Distinctly reaction-accelerating binding agent components for inorganic and organic preparations
- Hydrophilic modification of surfaces, e.g. for anti-fogging
- Special types for the paper industry
Levasil® 300/30% | Bindzil® 30/360 | Bindzil® 830 | |
Levasil® 500/15% | Bindzil® 415 | Bindzil® 515 | |
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Special types for the coating and adhesive sectors:
- Levasil® 300/30% ADH 06 and Levasil® 300/30% ADH 16
Foundries and steel sector
- For use as component of binding agents for
- precision casting using the shell process
- precision casting and artistic casting using the lost wax method
- coating of steel plates
- and as component of anti-corrosion coatings
Refractory sector
- Binding agent for ceramic and refractory materials such as ceramic fibres, glass fibres, etc.
- (Co-) Binding agent for ceramic materials and moulding compound
- Component of purely inorganic adhesive systems
Dental sector
- Component of investment materials
- Component of ceramic coatings
Chemical industry
- Modification of alkali silicates
- Component of anti-corrosion coatings
- Binding agent for the production of catalysts and granules
- Coating systems
- Modification of binding agents for improvement of:
- Adhesive strength
- Setting speed
- Scratch resistance and blocking resistance
- Improvement of water resistance and heat resistance
Paper industry
- Non-slip finishing of paper products such as paper bags, cardboard etc.
- Component of anti-wear coatings
Plastics industry
- Component of anti-wear coatings
- Component of scratch-resistant finishing for plastic surfaces
- Modification of binding agent systems, e.g. for cast films
Semiconductor technology / optical components
- Polishing aids for special polishing procedures
Coating systems / adhesives
- Adhesion improvement
- Setting acceleration
- Improvement of film hardness
- Improvement of blocking resistance, including early blocking resistance
- Improvement of film cohesion (e. g. for paving and PSA applications)
Textile sector
- Components of products for non-slip finishing
- Additive for spin preparations
- Component of coating systems and impregnations
Building sector
- Binding agent for fire and heat protection applications
- Component of exterior paints and plasters
- Preparations of stone strengtheners
- Setting accelerators for cement-bonded systems
- Shotcrete
On request, we will gladly send you our current product documentation and samples for laboratory tests.
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