Product Name
Zinc Stearate
Category
Heterocyclic Organic Compound
Description
Zinc stearate is a “zinc soap” that is widely used industrially. In this context, soap is used in its formal sense, a metal “salt” of a fatty acid. It is a White solid that repels water. It is insoluble in polar solvents such as alcohol and ether but soluble in aromatic hydrocarbons (e.g., benzene) and chlorinated hydrocarbons when heated. It is the most powerful mold release agent among all metal soaps. It contains no electrolyte and has a hydrophobic effect. Its main application areas are the plastics and rubber industry, where it is used as a releasing agent and lubricant which can be easily incorporated.Zinc carboxylates, e.g. basic zinc acetate, adopt complex formulas, and are not simply dicarboxylates of zinc. Instead the formula for most zinc carboxylates is Zn4O(O2CR)6, consisting of a Zn4O6+ core with carboxylate ligands spanning the edges.
Synonyms
Stearic acid, zinc salt
IUPAC Name
Zinc;octadecanoate
Molecular Formula
C36H70ZnO4
Canonical SMILES
CCCCCCCCCCCCCCCCCC(=O)[O-].CCCCCCCCCCCCCCCCCC(=O)[O-].[Zn+2]
InChI
XOOUIPVCVHRTMJ-UHFFFAOYSA-L
InChI Key
InChI=1S/2C18H36O2.Zn/c2*1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20;/h2*2-17H2,1H3,(H,19,20);/q;;+2/p-2
Melting Point
128-130 °C(lit.)
Solubility
Insoluble (NIOSH, 2016);Soluble in benzene; insoluble in water, alcohol and ether;Soluble in acids and common solvents when hot;Solubility in water: none;Insoluble;
Appearance
White powder with fatty acid odour
Application
It is widely used as a release agent for the production of many kinds of objects rubber, poly urethane, poly ester processing system, powder metallurgy. These applications exploit its "non-stick" properties . In cosmetics, zinc stearate is a lubricant and thickening to improve texture. It is an "activator" for rubber vulcanization by sulfur and accelerators. As discovered in the early days of vulcanization, zinc has a beneficial effect on the reaction of the sulfur with the polyolefin. The stearate is a form of zinc that is highly soluble in the nonpolar medium of the poly olefins. Being lipophilic, it functions as a phase transfer catalyst for the saponification of fats.zinc stearate is used in cosmetic formulations to increase adhesive properties. It is also used as a coloring agent. This is a mixture of the zinc salts of stearic and palmitic acids.Zinc stearate is primarily used in pharmaceutical formulations as a
lubricant in tablet and capsule manufacture at concentrations up to
1.5% w/w. It has also been used as a thickening and opacifying
agent in cosmetic and pharmaceutical creams, and as a dusting
powder.
Storage
Zinc stearate is stable and should be stored in a well-closed
container in a cool, dry place.
Color/Form
White powder free from gritiness;Fine, soft, bulky powder;
Covalently-Bonded Unit Count
3
Decomposition
Zinc stearate decomposes on burning producing irritating and toxic fumes including zinc oxide.;
Monoisotopic Mass
630.457g/mol
Octanol Water Partition Coefficient
1.2;
Odor
Faint odor;Slight, characteristic odor;
Other Experimental
Decomp by dilute acids;Hydrophobic;
pH
Neutral to moistened litmus paper;
Physical Description
ZINC STEARATE is a white, hydrophobic powder with a slight, characteristic odor. Mp: 130°C. Density: 1.1 g cm-3. Insoluble in water, ethyl alcohol and diethyl ether. Soluble in acids. Non-toxic. In technical grades, the percentage of zinc may vary according to the intended use. Products with less than the theoretical amount of zinc are more acidic.;DryPowder; DryPowder, OtherSolid; DryPowder, PelletsLargeCrystals, WetSolid; Liquid; OtherSolid; PelletsLargeCrystals; PelletsLargeCrystals, OtherSolid; WetSolid;WHITE FINE SOFT POWDER.;Soft, white powder with a slight, characteristic odor.;Soft, white powder with a slight, characteristic odor.;
Stability
Stable. Incompatible with strong oxidizing agents.
Storage Conditions
Keep away from heat and flame. Store in a cool, dry place. Keep containers tightly closed.
Topological Polar Surface Area
80.3A^2
Vapor Pressure
0 mm Hg (approx) (NIOSH, 2016);0 mmHg (approx);0 mmHg (approx);
Download
Banski, Mateusz, et al. Chemistry of Materials, 2015, 27(11), 3797-3800.
