BENTONE SD-2 rheological additive is an organic derivative of a bentonite clay. It is designed for use in moderate to high polarity systems containing solvents such a ketones, esters, glycol ethers and alcohols, including polar systems with some aromatic solvents.
BENTONE SD-2 is easy to incorporate and can be added dry to the pigment grinding process without requiring the use of a chemical activator or the preparation of a pregel. It may be used for post correction.
CHEMICAL & PHYSICAL PROPERTIES
Composition
organic derivative of a bentonite clay
Color / Form
very light cream, finely divided powder
Density
1.62 g/cm3
Particle size(dispersed)
less than 1 micron
These are typical properties not to be used for specification purposes. Application
Acid-curing systems
Adhesives
Anti-corrosion paints
Automotive finishes/primers
Epoxy systems
Foundry paints
Gravure printing inks
Industrial finishes
Inorganic zinc-rich coatings
Maintenance coatings
NC lacquers/inks
Paint removers
Polyester repair putties
PU two-pack systems
Sealants
Vinyl paints (high-build)
KEY PROPERTIES
Is a cost-effective replacement for conventional organoclay additives
Disperses very easily, even under low shear conditions
Provides stable viscosity build, controls sag and pigment settling
Eliminates the need for pregels
Needs no chemical activator
Can be added as a powder to the millbase either before or after the pigment dispersion or during letdown.
INCORPORATION
BENTONE SD-2 is simple and easy to incorporate in moderate to high polarity systems. It may be added dry to the grinding step together with the other dry raw materials such as pigments and fillers. When dispersed in the millbase concentrate it develops its full rheological properties. The addition of a chemical activator is not necessary.
When added to the pigment grind, BENTONE SD-2 is not sensitive to high temperatures and does not require a minimum temperature for activation.
The wet ability and dispersibility of BENTONE SD-2 additive decreases as the proportions of aromatics and low-polarity solvents in the system increase.
BENTONE SD-2 may be used for post-correction after letdown. Pre-tests are recommended to determine whether BENTONE SD-2 will sufficiently disperse under normal stirring conditions or whether a pre-dispersion in solvent/binder is advisable.
Post correction is best achieved by pumping a portion of the main batch into a tank fitted with a high speed disperser. Add BENTONE SD-2 and grind to an acceptable Hegman F.O.G. Return this dispersed and activated portion containing the BENTONE SD-2 to the main tank and mix until uniform.
LEVELS OF USE
The level of BENTONE SD-2 additive to be used in a specific system depends on the degree of thickening, sag and pigment settling control desired. Use levels are typically 0.2 - 1.0 % by weight of the entire formula. When reformulating with BENTONE SD-2, a good starting point is replacement of the currently used organoclay or fumed silica at an equal weight, followed by optimisation.
In many systems, at higher thickener concentration levels, BENTONE SD-2 is more efficient than BENTONE 27 or fumed silica. It is not efficient in solvents alone nor should it be used in greases or similar binderless systems.
HEALTH AND SAFETY
Before using this product please consult our Safety Data Sheet (SDS) for information on safe handling and storage. The SDS can be found on the company website.
STORAGE RECOMMENDATIONS
Store in a cool, dry location.
SHELF LIFE
BENTONE SD-2 has a shelf life of 4 (four) years from date of manufacture.
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