Organoclay for solvent – based coatings is produced through specific processing methods to meet the demands of these coating systems.
One common method is the wet process: bentonite powder is dispersed into a slurry, then purified and modified. Long carbon chains are used to replace the interlayer cations, expanding the interlayer spacing (d001 value: 1.7 – 3.0 nm) to form hydrophobic organoclay. The product is obtained after filtration, dehydration, drying, grinding, and sieving.
Another method is the dry process, which directly involves mixing selected moist sodium – based bentonite (with 20% – 30% water content, and calcium – based bentonite can also be used) with organic surfactants, followed by heating, extrusion, then drying, grinding, and packaging.
Alternatively, the extruded water – containing organoclay can be directly mixed with organic solvents, making it suitable for solvent – based coating applications.
In solvent-borne coating formulations, organoclay delivers shear-thinning thickening without water sensitivity; see organoclay thickener for solvent-based coatings for the complete application guide. Full grade specifications and polar activator requirements are listed on organoclay grades for solvent-borne coating systems. The broader coatings context is covered in organoclay for coatings — solvent-based applications. For anti-settling performance in high-pigment solvent paints, see anti-settling organoclay for solvent-based paint. Formulation-level technical data appear in organoclay for solvent paints — technical data.
The CP series of organic bentonite is mainly used in solvent-based and water-based paints, coatings, inks, lubricants, cosmetics, and oilfield drilling fluids.
Rheology modifiers are an organo clay (modified bentonite), designed especially for use in solvent based system. Organic Clay can be used widely in solvents from low polarity to medium-high polarity.
Properties
Composition Organic derivative of a montmorillonite clay
Appearance Fine powder, light yellow
Moisture content (105℃,2hr) ≤3.5%
Loss on ignition (1000℃) 28%-31%
Bulk density 0.53g/cm3
Fineness (<74μm, %) ≥98%
Organoclay for solvent-based coatings
- High gelling efficiency,high viscosity
- Wide application range, it can be applied in all low, middle and high polarity range
- Produce reproducible thixotropic consistency over a wide temperature range
- Imparts particle suspension, preventing hard settling of pigment and fillers
- Exerts strong film reinforcing action in organic binder systems
Application of Organo clay
Organo clay is used in the following applications:
- Marine paint, Industrial paint, heavy-duty, anticorrosion paint such as bituminous coatings, epoxy paints, chlorinated rubber paints
- Grease
- Inks
Sealant
Using
Organo Bentonite disperses under high shear and requires a polar activator for best efficiency. Heat is not required to obtain good dispersion. Addition levels are typically in 0.2%~2.0%. Polar activator (95% Ethanol or 95% Methanol) is needed. Normally addition level of polar activator is recommended to be 45%~60% of CP-40 in weight. If in xylene system, addition level of polar activator is about 30%-40% of CP-40 in weight.
Pre-gel is made as below procedure.
- Charge solvent to mill
- Slowly add CP-40 (6-10% by weight of total pre-gel) to mill under agitation.
- Mix at high speed for 5 minutes.
- Add polar activator.
- Mix at high speed for 5 minutes.
Package
Kraft bag or kraft complex interior with PE or customized
Storage
Organic bentonite clay has a shelf life of 2 years, and should be stored in a ventilated, cool and dry place.
Safety
All safety information is provided in the Material Safety Data Sheets for Zhejiang Camp-Shinning New Material Co.,Ltd..
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