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Identification & Functionality
- Chemical Family
- CASE Ingredients Functions
- Industrial Additives Functions
- Product Families
- Chemical Structure
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Dynasylan® SIVO 160
Features & Benefits
- CASE Ingredients Features
- Product Highlights
- Dynasylan® SIVO 160 is a water-borne sol-gel system which does not contain organic solvents.
- It does not release alcohols upon hydrolysis, contrary to standard functional alkoxysilanes.
- Dynasylan® SIVO 160 has a highly branched structure and contains a high concentration of active silanol groups.
- Therefore it can chemically bond to surfaces of suitable substrates and achieves a high degree of crosslinking by formation of 2- and 3- dimensional siloxane networks.
- Due to the high crosslinking density, an exceptional hardness can be achieved.
- On smooth surfaces, a layer thickness of more than 1 μm results in a brittle coating and should be avoided.
- On rough substrates thicker layers are possible without brittleness. If a higher layer thickness is necessary, formulations of Dynasylan® SIVO 160 with other sol-gel systems such as Dynasylan® SIVO 110, polymers, or polymer dispersions can be made.
- Suitable substrates: stainless steel, HDG steel, Zn-galvanized steel, aluminum, magnesium, glass, ceramics.
- The final curing temperature of Dynasylan® SIVO 160 depends on substrate and possibly the top-coat if the product is used as primer. In some cases Dynasylan® SIVO 160 based formulations can be dried at room temperature.
- In combination with a top- coat, a curing temperature of 60 to 80 °C is recommended for the final cure.
- Dynasylan® SIVO 160 is the latest addition to the range of silanes for corrosion protection. Designed as a corrosion protection primer specifically for zinc, aluminum, and magnesium, Dynasylan® SIVO 160 sets new performance standards with a low curing temperature for efficient coupling to the metal surface.
- Furthermore, a lower concentration is required in order to achieve effective corrosion protection.
- Dynasylan® SIVO 160 is a water-borne silane system based on sol-gel technology designed for metal surface finishing.
- This storage stable system is ideal for the addition to already existing or the creation of new environmentally friendly metal protection formulations.
- Besides offering all the advantages of condensed reactive silanes, it contains neither heavy metals nor fluorides and reacts easily with metal surfaces.
- In addition, its condensed nature ensures superior wetting of the metal surface and less need to formulate wetting agents into the system.
- Such wetting agents often reduce the effectivity of the corrosion protection system.
- Its high reactivity, demonstrated by a remarkably low curing temperature of 60 °C, represents a major breakthrough for water-borne sol-gel systems.
- The system has been especially developed for aluminum and magnesium substrates, and can be formulated into acidic corro- sion protection systems to achieve a marked improvement in corrosion protection performance.
- More importantly, the performance of the Dynasylan® SIVO 160 system on aluminum is on a par with chromium systems.
Applications & Uses
- Markets
- Application Method
- Application Characteristics
- Dynasylan® SIVO 160 can be used to formulate new conversion coatings for metal surfaces.
- Formulations of the product can advantageously used on glass, ceramics, stainless steel, HDG steel, zinc, aluminum, and magnesium.
- Because of its bi-functional nature Dynasylan® SIVO 160 finds its use as an additive to formulate primers and wash-coats as conversion layers, sealers or adhesion promotion primers on metal, glass, or ceramic surfaces.
- The product binds strongly to the metal through the reactive silanol groups of the molecule while being able to interact with a great variety of organic resins with its organofunctional groups.
- The performance of Dynasylan® 160 can be optimized by special formulations with other water-borne sol-gel systems or additives.
- The molecular weight of the molecule has been especially tailored for optimized wetting properties, thus a homogeneous surface layer is formed on the substrate.
- Dynasylan® SIVO 160 is a base resin/primer and often needs to be formulated for optimized performance in different applications methods and large scale processes.
- Dynasylan® SIVO 160 containing formulations can be sprayed, dipped, or applied with a doctor blade.
- The layer thickness depends on the formulation, the application and has to be evaluated.
- The following examples show the potential of Dynasylan® SIVO 160 which was used without further optimization.
- A typical adhesion promotion formulation for Dynasylan® SIVO 160 contains 10 % Dynasylan® SIVO 160 and 90 % water.
- This is applied onto the surface of alkaline cleaned and acid treated aluminum. Thereafter a polyester powder coating 60μ is applied.
- Dynasylan® SIVO 160 is predominantly suited as a binder or additive for low temperature curing (20 to 80 °C) sol-gel and sol-gel-based hybrid coatings.
- Dynasylan® SIVO 160 is a polymeric silane with reactive groups.
- Due to its high degree of polymerization and its high reactivity it has the following advantages:
- Water-borne
- Low VOC (volatile organic content)
- Heavy-metal and fluoride free
- Forms very thin, highly crosslinked layers (< 1 μm)
- Resistant against boiling water and alkaline aqueous solutions
- Thermally stable up to 220 °C
- Processing
- Dynasylan® SIVO 160 can be mixed with deionized water in any proportion. '
- Dilution in common organic solvents such as ethanol, iso-propanol, butyl glycol, or methoxypropanol is possible.
- To prepare an adhesion promotion primer solution, Dynasylan® SIVO 160 is typically diluted 10 % in deionized water.
- It can also be formulated with water-thinnable binders and other additives such as Tego® Wet 280 (wetting agent).
- The compatibility of formulations depends also on the pH value as Dynasylan® SIVO 160 is only stable in an acidic pH area.
- As part of the SIVO® SOL Technology, Dynasylan® SIVO 160 can be formulated other components of this technology.
- For instance, the addition of Dynasylan® SIVO 160 to the inorganic binder Dynasylan® SIVO 110 results in mixed inorganic binder formulations allows for the formulation of thicker coatings that cure at lower temperatures than Dynasylan® SIVO 110 alone.
- As another example, Dynasylan® SIVO 112 can be added in amounts of 2-50 % to Dynasylan® SIVO 160 to achieve very thin easy-to-clean coatings.
- Dynasylan® SIVO 160 is not stable in formulations which contain fluoride. Dynasylan® SIVO 160 must be protected against freezing temperatures.
- Due to the high reactivity of Dynasylan® SIVO 160 droplets of the product at the top of the packaging (PE pails or steel drums with PE-inliner) can react when the water of the droplet evaporates and small gel particles are formed.
- Therefore, a simple filtration before the application or formulation of Dynasylan® SIVO 160 is recommended.
- Substrate Recommendations
Recommended for :
- Steel: cold rolled steel (CRS). abraded surface 0.3 –0.6% Mn / 0.08 – 0.13% C / 0.05% S / 0.04% P
- Aluminum: alloy (3105 H 24) 96.8 – 97.4% Al / 1.0– 1.5% Mn / 0.6% Si / 0.05 –0.2% Cu
- Glass
Properties
- Appearance
- Clear to slightly opaque. colorless to slightly yellow. low viscous liquid.
- Technical Data
| Value | Units | Test Method / Conditions | |
| Density (at 20°C) | approx. 1.025 | g/cm³ | DIN 51757 |
| Viscosity (at 20°C) | approx. 9 | mPa.s | DIN 53015 |
| Flash Point | min. 95 | °C | DIN EN 22719 |
| Solid Content | 8.5 - 9.5 | Mass % | 3g/2h 105°C |
| pH (at 20°C, 1:1 in H₂O) | approx. 4.0 - 4.6 | — | DIN 19268 |
Regulatory & Compliance
- Chemical Inventories
Technical Details & Test Data
- Coating Applications
2-Pack epoxy coating
- Epoxy coatings are especially important as primers.
- The pre-treatment system can markedly increase the service life of the final product.
- Thus Dynasylan® SIVO 160 can optimize pre-treatment formulations for complex layer compositions.
- Shown below are panels that were cleaned with an alkaline industrial cleaner.
- Dynasylan® SIVO 160 was applied in a concentration of 0.3 % solid content and dried at 60 °C for 10 minutes.
- The panels were then coated with a 50 μm (wet coating thick-ness) of a standard 2-pack epoxy primer.
Reference
500 hours of acetic acid salt spray testing. Especially adhesion and corrosion at the scribe are improved in comparison to traditional corrosion protection systems.
Polyester powder coating
Due to environmental factors powder coatings need to cure at ever lower tem- peratures.
Dynasylan® SIVO 160 is an excellent starting point for such new low-temperature curing coatings.
Further example, the aluminum substrates were treated with Dynasylan® SIVO 160 and a polyester powder coating was applied.
The system was cured at 180 °C, and then exposed to 240 hours of copper accelerated salt spray test.
Furthermore, Dynasyan® SIVO 160 is excellent for the pre-treatment of metals before a low-temperature before a low-temperature (120 to 140 °C) curing reactive powder coating.
Salt spray test
240 hours copper accelerated salt spray test
- Corrosion Protection
- Dynasylan® SIVO 160 for Blank Corrosion Protection on Aluminum 5005
Neutral Salt Spray Test acc. DIN ISO 9227 - 1000 hours.
- Dynasylan® SIVO 160 for Blank Corrosion Protection on HDG Steel
Neutral Salt Spray Test acc. DIN ISO 9227 - 200 hours.
- Dynasylan® SIVO 160 for Corrosion Protection on Mg and Al Metal Alloys
CASS-Test acc. DIN ISO 9227 - 1000 hours.
- Improvement of Corrosion Protection with Dynasylan® SIVO 160 and Dynasylan® HYDROSIL 2909
Neutral Salt Spray Test acc. DIN ISO 9227 - 200 hours
Conclusion: Dynasylan® HYDROSIL 2909 can often replace Cr3+ in corrosion protection system based on Dynsasylan ® SIVO 160.
Packaging & Availability
- Packaging Type
- Packaging Information
Dynasylan® SIVO 160 is supplied in 25 kg PE drums, 200 kg PE-inlined steel drums, and 1.000 kg containers (IBC).
Storage & Handling
- Shelf Life
- 12 months
- Storage Conditions
- Due to its water content Dynasylan® SIVO 160 must be stored above freezing.
- Storage temperature must not exceed 40 °C.
- In sealed containers Dynasylan® SIVO 160 has a shelf life of min. 12 months from delivery.