CAS 557-05-1 Zinc Stearate - Materials / Alfa Chemistry

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Zinc Stearate

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Catalog Number

ACM557051

CAS Number

557-05-1

Product Name

Zinc Stearate

Structure

Category

Ceramic Materials; Glass Additives; Polymers

Synonyms

Stearic acid, zinc salt

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.

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

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;

Complexity

196

Covalently-Bonded Unit Count

EC Number

209-151-9

Exact Mass

630.457g/mol

Heavy Atom Count

ICSC Number

0987

Log P

9.99310

Monoisotopic Mass

630.457g/mol

Odor

Faint odor;Slight, characteristic odor;

Other Experimental

Decomp by dilute acids;Hydrophobic;

Neutral to moistened litmus paper;

Rotatable Bond Count

RTECS Number

ZH5200000

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

UNII

H92E6QA4FV

UN Number

3077

Vapor Pressure

0 mm Hg (approx) (NIOSH, 2016);0 mmHg (approx);0 mmHg (approx);

MSDS

Download MSDS

COA

Download COA

Spec Sheet

Download Spec Sheet

Case Study

Zinc Stearate as A Precursor for The Synthesis of Zinc Selenide Semiconductor Nanocrystals

Banski, Mateusz, et al. Chemistry of Materials, 2015, 27(11), 3797-3800.

A simple synthetic method can be used to synthesize luminescent zinc selenide (ZnSe) nanocrystals (NCs). This reaction enables the robust synthesis of luminescent ZnSe NCs by heating zinc stearate (ZnSt2), 1-octadecene (ODE), and selenium (Se) in a single flask. During the synthesis process, the role of ZnSt2 is to provide zinc ions and a limited number of surface passivating ligands to the NC surface.
Synthesis of ZnSe NCs from zinc stearate
· ZnSt2 (0.4 mmol), Se (0.4 mmol) and 26 ml of ODE were loaded in a 100 mL three-necked flask and degassed at room temperature.
· The temperature of solution was raised to 295 °C under N2. After 1 hr, the reaction was rapidly cooled down by blowing air onto the flask and an excess of acetone was added to precipitate the NCs.
· For purification, the NCs were dispersed in toluene and centrifuged to remove any insoluble residue. To clean the surface of NCs, the residue was washed three times with methanol and redispersed in toluene for further characterization.

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