Zinc Octoate (Zinc Octanoate) CAS 557-09-5

Zinc Octoate (Zinc Octanoate) – Polymerization Catalyst and Functional Additive

Basic Information

• CAS Number: 557-09-5

• Molecular Formula: C₁₆H₃₀O₄Zn (Zn(C₈H₁₅O₂)₂)

• Molecular Weight: 351.80 g/mol

• Appearance: White to off-white crystalline powder

• Odor: Practically odorless

• Solubility: Practically insoluble in water; readily soluble in organic solvents (benzene, toluene, xylene, ethers, and esters)

• Stability: Thermally stable under normal storage conditions; may decompose at high temperatures

Overview
Zinc octoate (zinc octanoate) is an organometallic compound belonging to the class of zinc carboxylates. It is formed by the neutralization of octanoic acid (caprylic acid) with zinc oxide or other zinc reagents. The compound features a zinc ion coordinated to two octanoate anions, providing a stable complex with excellent catalytic properties. Its low toxicity and ease of handling make it a preferred catalyst in various industrial applications.

Key Properties

• Molecular structure: The zinc center is coordinated by two octanoate ligands, forming a structure that is stable yet reactive enough to participate in catalytic cycles.

• Solubility: Excellent solubility in nonpolar and moderately polar organic media, enabling homogeneous catalysis in organic-phase reactions.

• Thermal stability: Sufficient stability for typical polymerization processes; avoid excessive heating to prevent decomposition.

• Catalytic activity: Effective as a mild, low-toxicity catalyst for transesterification, ring-opening polymerization, and condensation reactions.

Applications

• Polymer synthesis: Used as a catalyst in the production of polyesters, polyurethanes, polylactic acid (PLA), and other biodegradable polymers via ring-opening polymerization of lactides and lactones.

• Lubricants and greases: Incorporated as an anti-wear and anti-corrosion additive in lubricating oils and greases, forming protective films on metal surfaces.

• Coatings and adhesives: Improves adhesion, stability, and corrosion resistance in protective coatings, paints, and adhesives.

• Industrial catalysis: Employed in transesterification reactions for biodiesel production and other organic syntheses.

• Other uses: As a stabilizer in PVC and other polymer formulations.

Recommended Use
Typical dosage ranges from 0.1–2.0% by weight, depending on the application and desired catalytic or stabilizing effect. Optimize through formulation testing.

Safety and Handling

• Low acute toxicity; however, avoid inhalation of dust and prolonged skin contact.

• Use appropriate personal protective equipment (gloves, safety goggles, dust mask) when handling.

• Store in a cool, dry, well-ventilated area, away from strong oxidizers and moisture.

• Keep containers tightly sealed to prevent contamination and caking.

Packaging
Available in 1 kg, 5 kg, 25 kg, and 50 kg containers (bags, drums). Custom packaging upon request.

Quality Assurance
Each batch is tested for purity, zinc content, and moisture to ensure consistent performance in catalytic and additive applications.