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Cobalt Drier
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Cobalt Drier is a metal-based drying agent primarily composed of cobalt salts (commonly cobalt octoate or cobalt naphthenate). It is widely used as a catalyst to accelerate the drying (oxidative curing) of oils, alkyd resins, and varnishes in coatings and paints. This drier promotes polymerization and cross-linking of unsaturated fatty acids in drying oils upon exposure to air, significantly reducing drying times and improving film hardness and durability. Cobalt driers are essential additives in industrial, decorative, and automotive coatings due to their effectiveness at low concentrations and compatibility with various resin systems.
Description
Cobalt Drier Uses
Primary UsesÂ
- Paints, Coatings & Varnishes
- Used as a catalyst (drying agent) in oil-based paints, alkyd resins, enamels, lacquers, and varnishes.
- Accelerates the oxidative polymerization of drying oils like linseed oil, tung oil, and soya oil.
- Enhances drying speed, film hardness, and gloss of coatings.
- Improves overall performance and durability of protective and decorative finishes.
- Printing Inks
- Incorporated in oxidative drying printing inks to speed up drying on paper, metal, and plastic substrates.
- Helps achieve rapid tack-free films and improved adhesion.
- Adhesives & Sealants
- Used in adhesive formulations where drying and curing of unsaturated oils or resins are required.
- Ensures quick set times and strong bonding properties.
Secondary UsesÂ
- Wood Finishing
- Utilized in wood stains, lacquers, and oils to accelerate drying, improve penetration, and enhance surface protection.
- Polymer & Resin Chemistry
- Acts as a catalyst in the cross-linking reactions of certain polymers and resins beyond coatings.
- Artistic & Specialty Applications
- Employed in fine arts for oil painting mediums to reduce drying times without affecting color or finish.
- Metal Treatments
Occasionally used in specialty metal drying formulations to promote quicker cure of protective coatings.
PRODUCT KEY FEATURES
1. Basic Identification Attributes
- Chemical Name (IUPAC): Cobalt(II) 2-ethylhexanoate or Cobalt(II) naphthenate (depending on product)
- Common/Trade Name: Cobalt Drier, Cobalt Octoate, Cobalt Naphthenate
- CAS Number:
- Cobalt(II) 2-ethylhexanoate: 136-52-7
- Cobalt naphthenate: 64742-52-5 (varies with preparation)
- HS Code: 2915.70.00
- Molecular Formula: Variable – complex cobalt salts dissolved in oil solvents
- Synonyms:
- Cobalt drying agent
- Cobalt octoate
- Cobalt naphthenate
2. Physical & Chemical Properties
- Physical State: Viscous oily liquid or solution
- Color & Odor: Dark amber to reddish-brown; characteristic solvent odor
- Melting/Freezing Point: Not applicable (liquid at room temperature)
- Boiling Point: Approx. 230–270°C (solvent dependent)
- Density: ~1.0–1.1 g/cm³
- Solubility:
- Soluble in oils, organic solvents (aromatic hydrocarbons, ketones)
- Insoluble in water
- Stability: Stable under normal conditions; sensitive to strong acids and bases
3. Safety & Hazard Attributes
- Hazard Class (GHS):
- Harmful if swallowed or inhaled
- Skin and respiratory sensitizer
- May cause allergic skin reactions
- Toxic to aquatic life with long-lasting effects
- NFPA Ratings:
- Health: 2
- Flammability: 2
- Reactivity: 0
- Exposure Limits: No specific OSHA PEL; cobalt metal and compounds generally limited to 0.1 mg/m³ (TWA)
- Toxicity: May cause skin and respiratory sensitization; chronic exposure can affect lungs and cause cobalt-related health effects
- Reactivity: Stable; avoid strong oxidizers and acids
4. Storage & Handling Attributes
- Storage Conditions: Store in tightly closed containers in a cool, dry, well-ventilated area away from heat and ignition sources
- Container Type: Metal or plastic drums with secure sealing
- Shelf Life: Typically 1–2 years if stored properly
- Special Handling:
- Use explosion-proof equipment and grounding due to flammable solvents
- Avoid skin and eye contact; use adequate ventilation
5. Regulatory & Compliance Attributes
- FDA Status: Not approved for food or pharmaceutical use
- REACH Status: Registered as a cobalt compound under EU regulations
- Transportation: Classified as flammable liquid (depending on solvent) and hazardous for transport
- Waste Disposal: Dispose of as hazardous waste in accordance with local regulations
6. Environmental & Health Impact
- Ecotoxicity: Toxic to aquatic organisms; avoid release to environment
- Persistence: May persist in soils and sediments due to cobalt content
- Bioaccumulation: Low potential
- Carcinogenicity/Mutagenicity: Cobalt compounds are classified as possible carcinogens (IARC Group 2B)
Biodegradability: Organic carrier solvents may biodegrade; cobalt itself is an element and does not degrade
SAFETY HANDLING PRECAUTIONS
-
Safety Handling Precautions
Personal Protective Equipment (PPE):
- Chemical-resistant gloves
- Safety goggles or face shield
- Respirator (if ventilation is inadequate)
- Protective clothing
Handling Measures:
- Avoid inhalation of vapors and contact with skin or eyes
- Use in well-ventilated areas or fume hoods
- Prevent release into environment
Storage Measures:
- Store away from heat, sparks, and open flames
- Keep container tightly closed
- Use grounding and bonding during transfer to avoid static discharge
Hygiene Practices:
- Wash hands thoroughly after handling
- Do not eat, drink, or smoke in work areas
First Aid Measures
- Inhalation: Move victim to fresh air; if breathing difficulties occur, seek medical attention
- Skin Contact: Wash affected area with soap and water; seek medical advice if irritation or allergic reaction develops
- Eye Contact: Rinse immediately with plenty of water for at least 15 minutes; seek medical attention
- Ingestion: Do not induce vomiting; seek immediate medical assistance
Firefighting Measures
- Fire Hazards: Flammable due to solvent content; cobalt salts themselves are not combustible but may decompose on heating
- Extinguishing Media: Use foam, dry chemical, carbon dioxide (COâ‚‚)
- Special Precautions: Firefighters should wear self-contained breathing apparatus and protective gear
- Decomposition Products: May release cobalt oxides, carbon monoxide, carbon dioxide, and solvent vapors
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