Zinc stearate

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Zinc stearate
Zinc stearate
Names
IUPAC name
zinc octadecanoate
Other names
zinc distearate
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.008.321 Edit this at Wikidata
EC Number
  • 209-151-9
RTECS number
  • ZH5200000
UNII
UN number 3077
  • 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 checkY
    Key: XOOUIPVCVHRTMJ-UHFFFAOYSA-L checkY
  • InChI=1/2C18H36O2.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
    Key: XOOUIPVCVHRTMJ-NUQVWONBAX
  • [Zn+2].[O-]C(=O)CCCCCCCCCCCCCCCCC.[O-]C(=O)CCCCCCCCCCCCCCCCC
Properties
C36H70O4Zn
Molar mass 632.33 g·mol−1
Appearance soft, white powder
Odor slight, characteristic[1]
Density 1.095 g/cm3, solid
Melting point 120 to 130 °C (248 to 266 °F; 393 to 403 K)
Boiling point decomposes
insoluble
Solubility in Ethanol insoluble
Solubility in ether insoluble
Solubility in benzene slightly soluble
Hazards
GHS labelling:[2]
GHS07: Exclamation markGHS09: Environmental hazard
Warning
H335, H400, H413
P261, P271, P273, P304+P340, P312, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g. diesel fuelInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
2
0
Flash point 277 °C (531 °F; 550 K)
420 °C (788 °F; 693 K)
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)[1]
REL (Recommended)
 TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)[1]
IDLH
(Immediate danger)
 N.D.[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Zinc stearate is a "

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.[3]

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.

Applications

It is widely used as a release agent for the production of many kinds of objects: rubber, polyurethane, polyester processing system, powder metallurgy. These applications exploit its "non-stick" properties.[3] In cosmetics, zinc stearate is a lubricant and thickening agent used to improve texture.[4]

It is an "activator" for accelerated rubber sulfur vulcanization. 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 polyolefins.

Being lipophilic, it functions as a

phase transfer catalyst for the saponification of fats.[3]

Niche uses

It is a component of some paints, imparting gloss. As a chief ingredient in "fanning powder", it is used by magicians performing card manipulation to decrease the friction between playing cards.

References

  1. ^ a b c d NIOSH Pocket Guide to Chemical Hazards. "#0676". National Institute for Occupational Safety and Health (NIOSH).
  2. ^ "ZINC stearate". pubchem.ncbi.nlm.nih.gov.
  3. ^
    doi:10.1002/14356007.a10_245.pub2
  4. ^ "Zinc Stearate | Cosmetics Info". cosmeticsinfo.org. Archived from the original on 2013-09-06.
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