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 Weight
632.35
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.)
Flash Point
180 °C
Density
1.095g/ml
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
Storage
Zinc stearate is stable and should be stored in a well-closed
container in a cool, dry place.
container in a cool, dry place.
Color Form
White powder free from gritiness;Fine, soft, bulky powder;
Complexity
196
Covalently-Bonded Unit Count
3
Decomposition
Zinc stearate decomposes on burning producing irritating and toxic fumes including zinc oxide.;
EC Number
209-151-9
Exact Mass
630.457g/mol
H-Bond Acceptor
4
Heavy Atom Count
41
ICSC Number
0987
LogP
9.99310
Monoisotopic Mass
630.457g/mol
Odor
Faint odor;Slight, characteristic odor;
Other Experimental
Decomp by dilute acids;Hydrophobic;
Physical State
Solid
Rotatable Bond Count
30
RTECS Number
ZH5200000
Stability
Stable. Incompatible with strong oxidizing agents.
Topological Polar Surface Area
80.3A^2
UNII
H92E6QA4FV
UN Number
3077
Vapor Pressure
0 mm Hg (approx) (NIOSH, 2016);0 mmHg (approx);0 mmHg (approx);
