ZINC OCTOATE

Zinc octoate (zinc 2-ethylhexanoate, CAS No. 136-53-8) is a highly versatile metal carboxylate extensively utilized in industrial and scientific applications. 
This comprehensive review examines its synthesis, physicochemical properties, reaction mechanisms, and applications in coatings, polymers, pharmaceuticals, and nanotechnology. 
Recent advancements, environmental considerations, and future research directions are also discussed.
CAS No. 136-53-8
Zinc octoate, zinc 2-ethylhexanoate, CAS 136-53-8, drying agent, PVC stabilizer, antimicrobial agent

Synonyms
Zinc octoate, also known as:,Zinc 2-ethylhexanoate,Zinc(II) ethylhexanoate,Bis(2-ethylhexanoato)zinc,Octoic acid zinc salt

CAS Number: 136-53-8
EC Number: 205-253-3

Historical Background
First synthesized in the early 20th century as a paint drier.
Gained prominence in PVC stabilization in the 1950s.

Industrial Importance
Primary Uses:
Coatings: Accelerates drying in alkyd resins.
Polymers: Prevents thermal degradation of PVC.
Pharmaceuticals: Antimicrobial and antifungal properties.
Procedure:
Reactants: Zinc oxide (ZnO) and 2-ethylhexanoic acid.
Conditions: Heated at 80–100°C with stirring.
Byproduct: Water (removed under vacuum).
Yield: ~95%

Procedure:
Reactants: Zinc chloride (ZnCl₂) and sodium octoate.
Solvent: Water or ethanol.
Precipitation: NaCl is filtered out.
Advantage: Higher purity product.

Alternative Synthesis Routes
Electrochemical synthesis: Zinc anode in 2-ethylhexanoic acid.
Microwave-assisted synthesis: Faster reaction time.

Purification and Characterization
Solvent Extraction: Removes unreacted acid.
Spectroscopic Methods:
FTIR: Peaks at ~1550 cm⁻¹ (carboxylate stretch).
NMR: Characteristic alkyl proton signals.
XRD: Confirms crystalline structure.

Physicochemical Properties
General Properties
Property    Value
CAS No.    136-53-8
Molecular Formula    C₁₆H₃₀O₄Zn
Molecular Weight    351.80 g/mol
Appearance    Colorless to pale yellow liquid/viscous gel
Melting Point    ~120°C (decomposition)
Density    1.05–1.15 g/cm³
Solubility    Soluble in hydrocarbons, alcohols, ethers
Thermal Stability
Decomposes above 200°C to ZnO and organic byproducts.

Spectroscopic Data
FTIR: Strong bands at 1540–1560 cm⁻¹ (COO⁻ asymmetric stretch).
NMR (¹H): δ 0.8–2.5 ppm (alkyl protons).

Mechanisms of Action
As a Drying Agent (Siccative)
Mechanism:
Zn²⁺ promotes free radical oxidation of unsaturated fatty acids.
Accelerates crosslinking in alkyd resins.

As a PVC Stabilizer
Mechanism:
Scavenges HCl released during PVC degradation.
Prevents autocatalytic decomposition.

Antimicrobial Activity
Mechanism:
Zn²⁺ disrupts microbial cell membranes.
Inhibits fungal and bacterial growth.

Industrial Applications
Paints and Coatings
Role: Primary or secondary drier in:
Alkyd resins
Epoxy coatings
Printing inks
Polymer Industry
PVC Stabilization:
Used in rigid PVC pipes, cables, and films.
Rubber Vulcanization: Acts as an activator.

Pharmaceuticals and Cosmetics
Antifungal creams (e.g., athlete’s foot treatments).
Preservative in ointments.

Emerging Applications
Nanotechnology: Nano-ZnO precursor.
Bioactive Coatings: Antimicrobial surfaces.

Recent Advances
Nano-Zinc Octoate
Higher surface area → enhanced catalytic activity.
Bio-based Alternatives
Derived from renewable octoic acid sources.

Hybrid Catalysts
Combined with rare-earth metals for improved performance.

Regulatory Status
REACH: Registered in the EU.
EPA: Approved for industrial use.

Handling and Storage
Storage: In airtight containers, away from moisture.
PPE: Gloves and goggles recommended.

Conclusion and Future Perspectives
Zinc octoate remains indispensable in coatings, polymers, and medicine.
Future Research Directions:
Green synthesis methods.
Biomedical applications (e.g., wound healing).

SAFETY INFORMATION ABOUT ZINC OCTOATE

First aid measures:
Description of first aid measures:
General advice:
Consult a physician. 
Show this safety data sheet to the doctor in attendance.
Move out of dangerous area:
 
If inhaled:
If breathed in, move person into fresh air. 
If not breathing, give artificial respiration.
Consult a physician.
In case of skin contact:
Take off conSAFETYtaminated clothing and shoes immediately. 
Wash off with soap and plenty of water.
Consult a physician.
 
In case of eye contact:
Rinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Continue rinsing eyes during transport to hospital.
 
If swallowed:
Do NOT induce vomiting. 
Never give anything by mouth to an unconscious person. 
Rinse mouth with water. 
Consult a physician.
 
Firefighting measures:
Extinguishing media:
Suitable extinguishing media:
Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Special hazards arising from the substance or mixture
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas
 
Advice for firefighters:
Wear self-contained breathing apparatus for firefighting if necessary.
Accidental release measures:
Personal precautions, protective equipment and emergency procedures
Use personal protective equipment. 
 
Avoid breathing vapours, mist or gas. 
Evacuate personnel to safe areas.
 
Environmental precautions:
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
 
Methods and materials for containment and cleaning up:
Soak up with inert absorbent material and dispose of as hazardous waste. 
Keep in suitable, closed containers for disposal.
 
Handling and storage:
Precautions for safe handling:
Avoid inhalation of vapour or mist.
 
Conditions for safe storage, including any incompatibilities:
Keep container tightly closed in a dry and well-ventilated place. 
Containers which are opened must be carefully resealed and kept upright to prevent leakage.
Storage class (TRGS 510): 8A: Combustible, corrosive hazardous materials
 
Exposure controls/personal protection:
Control parameters:
Components with workplace control parameters
Contains no substances with occupational exposure limit values.
Exposure controls:
Appropriate engineering controls:
Handle in accordance with good industrial hygiene and safety practice.
Wash hands before breaks and at the end of workday.
 
Personal protective equipment:
Eye/face protection:
Tightly fitting safety goggles. 
Faceshield (8-inch minimum). 
Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
 
Skin protection:
Handle with gloves. 
Gloves must be inspected prior to use. 
Use proper glove
removal technique (without touching glove's outer surface) to avoid skin contact with this product. 
Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices. 
Wash and dry hands.
 
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
Splash contact
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
It should not be construed as offering an approval for any specific use scenario.
 
Body Protection:
Complete suit protecting against chemicals, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.
Respiratory protection:
Where risk assessment shows air-purifying respirators are appropriate use a fullface respirator with multi-purpose combination (US) or type ABEK (EN 14387) respirator cartridges as a backup to engineering controls. 
 
If the respirator is the sole means of protection, use a full-face supplied air respirator. 
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).
Control of environmental exposure
Prevent further leakage or spillage if safe to do so. 
Do not let product enter drains.
Discharge into the environment must be avoided.
 
Stability and reactivity:
Chemical stability:
Stable under recommended storage conditions.
Incompatible materials:
Strong oxidizing agents:
Hazardous decomposition products:
Hazardous decomposition products formed under fire conditions. 
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas.
 
Disposal considerations:
Waste treatment methods:
Product:
Offer surplus and non-recyclable solutions to a licensed disposal company. 
Contact a licensed professional waste disposal service to dispose of this material.
Contaminated packaging:
Dispose of as unused product