Organoclay plays a crucial role in automotive coatings, contributing to enhanced performance and quality of these coatings.
In China, the annual output of bentonite reaches approximately 4 million tons, with its consumption spanning various industries. While the foundry industry accounts for the largest share at around 44%, and drilling mud at 28%, organoclay derived from bentonite is gaining attention in automotive coatings.
However, the development of organoclay faces challenges: factors like production processes, unstable equipment, and quality issues, along with the impact of organic covering agent prices, lead to high production costs, resulting in slow growth.
Currently, high – quality organoclay for demanding applications such as automotive coatings still relies heavily on imports.
Automotive coatings demand precise sag control during spray application and storage stability over the product lifetime; organoclay meets both requirements, as detailed on organoclay for automotive coatings — anti-sag performance. The relevant product grades and activation protocols are at organoclay grade for automotive coating formulation. The general coatings application context is at organoclay for coatings — automotive application. For anti-sag mechanism details, see anti-sag agent for automotive primer and topcoat. Automotive-specific technical data are available in organoclay for automotive 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 automotive 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 of Organoclay for automotive coatings
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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