Zinc Stearate

CAS

557-05-1

Catalog Number

ACM557051

Category

Other Products

Molecular Weight

632.35

Molecular Formula

C36H70ZnO4

MSDS COA Spec Sheet

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Specification

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

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.

Active Content

95%

Color/Form

White powder free from gritiness;Fine, soft, bulky powder;

Complexity

196

Covalently-Bonded Unit Count

Decomposition

Zinc stearate decomposes on burning producing irritating and toxic fumes including zinc oxide.;

EC Number

209-151-9

Exact Mass

630.457g/mol

Hazard Codes

H-Bond Acceptor

Heavy Atom Count

ICSC Number

0987

LogP

9.99310

Monoisotopic Mass

630.457g/mol

Octanol Water Partition Coefficient

1.2;

Odor

Faint odor;Slight, characteristic odor;

Other Experimental

Decomp by dilute acids;Hydrophobic;

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.;

Physical State

Solid

PSA

8.26

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);

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.

March 7, 2023

Work good in chemical analysis
Zinc Stearate can be used as a reference compound to study the infrared spectrum of zinc oxide (ZnO) catalyst substrate capped by colloidal stearate, which can be used to analyze gas adsorption.

What is the molecular formula of Zinc stearate?

The molecular formula of Zinc stearate is Zn(C18H35O2)2.

What is the molecular weight of Zinc stearate?

The molecular weight of Zinc stearate is 632.3 g/mol.

Is Zinc stearate soluble in water?

No, Zinc stearate is insoluble in water.

In which industries is Zinc stearate mainly used?

Zinc stearate is mainly used as a releasing agent and lubricant in the rubber and plastics industry.

Why is Zinc considered an essential element for life?

Zinc is considered an essential element for life as it is a cofactor for over 300 enzymes and is found in just as many transcription factors.

What is the color and odor of Zinc stearate?

Zinc stearate is a white powder with a slight, characteristic odor.

What is the melting point of Zinc stearate?

The melting point of Zinc stearate is 130 °C.

Is Zinc stearate toxic?

Zinc stearate is non-toxic.

How is the percentage of zinc in Zinc stearate products described in technical grades?

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.

Can you provide a synonym for Zinc stearate?

One of the synonyms for Zinc stearate is Zinc octadecanoate.