Calciumdistearat Chemische Eigenschaften,Einsatz,Produktion Methoden
ERSCHEINUNGSBILD
WEISSES PULVER.
PHYSIKALISCHE GEFAHREN
Staubexplosion der pulverisierten oder granulierten Substanz in Gemischen mit Luft m?glich.
CHEMISCHE GEFAHREN
Zersetzung beim Verbrennen unter Bildung reizender Rauche.
ARBEITSPLATZGRENZWERTE
TLV:(als Stearat) (Einatembare Fraktion) 10 mg/m?(als TWA); Krebskategorie A4 (nicht klassifizierbar als krebserzeugend für den Menschen); (ACGIH 2005).
MAK nicht festgelegt (DFG 2005).
AUFNAHMEWEGE
Aufnahme in den K?rper durch Inhalation.
INHALATIONSGEFAHREN
Eine bel?stigende Partikelkonzentration in der Luft kann beim Dispergieren schnell erreicht werden.
WIRKUNGEN BEI KURZZEITEXPOSITION
WIRKUNGEN BEI KURZZEITEXPOSITION: Reizt m?glicherweise mechanisch.
LECKAGE
Verschüttetes Material aufsaugen. Pers?nliche Schutzausrüstung: Atemschutzger?t, P1-Filter für inerte Partikel.
R-S?tze Betriebsanweisung:
R20/21/22:Gesundheitssch?dlich beim Einatmen,Verschlucken und Berührung mit der Haut.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-S?tze Betriebsanweisung:
S22:Staub nicht einatmen.
S24/25:Berührung mit den Augen und der Haut vermeiden.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
Chemische Eigenschaften
Calcium stearate occurs as a fine, white to yellowish-white, bulky powder having a slight, characteristic odor. It is unctuous and free from grittiness. It is found in some lubricants and surfactants.
synthetische
Calcium stearate is produced by heating stearic acid, a fatty acid, and calcium oxide:
2C
17H
35COOH + CaO→(C
17H
35COO)
2Ca + H
2O
It is also the main component of soap scum, a white solid that forms when soap is mixed with hard water. Unlike soaps containing sodium and potassium, calcium stearate is insoluble in water and does not lather well . Commercially it is sold as a 50 % dispersion in water or as a spray dried powder. As a food additive it is known by the generic E number E470. .
Application
Calcium stearate is used as a flow agent in powders including some foods (such as Smarties), a surface conditioner in hard candies such as Sprees, a waterproofing agent for fabrics, a lubricant in pencils and crayons.
The concrete industry uses calcium stearate for efflorescence control of cementitious products used in the production of concrete masonry units i.e. paver and block, as well as waterproofing.
In paper production, calcium stearate is used as a lubricant to provide good gloss, preventing dusting and fold cracking in paper and paperboard making.
In plastics, it can act as an acid scavenger or neutralizer at concentrations up to 1000ppm, a lubricant and a release agent. It may be used in plastic colorant concentrates to improve pigment wetting. In rigid PVC, it can accelerate fusion, improve flow, and reduce die swell.
Applications in the personal care and pharmaceutical industry include tablet mold release, anti-tack agent, and gelling agent.
Calcium stearate is a component in some types of defoamers.
Vorbereitung Methode
Calcium stearate is prepared by the reaction of calcium chloride
with a mixture of the sodium salts of stearic and palmitic acids. The
calcium stearate formed is collected and washed with water to
remove any sodium chloride.
Hazard
A nuisance dust.
Pharmazeutische Anwendungen
Calcium stearate is primarily used in pharmaceutical formulations
as a lubricant in tablet and capsule manufacture at concentrations
up to 1.0% w/w. Although it has good antiadherent and lubricant
properties, calcium stearate has poor glidant properties.
Calcium stearate is also employed as an emulsifier, stabilizing
agent, and suspending agent, and is also used in cosmetics and food
products.
Sicherheitsprofil
A nuisance dust. When
heated to decomposition it emits acrid
smoke and irritating fumes.
Sicherheit(Safety)
Calcium stearate is used in oral pharmaceutical formulations and is
generally regarded as a relatively nontoxic and nonirritant material.
Lager
Calcium stearate is stable and should be stored in a well-closed
container in a cool, dry place.
Regulatory Status
GRAS listed. Included in the FDA Inactive Ingredients Database
(oral capsules and tablets). Included in nonparenteral medicines
licensed in the UK. Included in the Canadian List of Acceptable
Non-medicinal Ingredients.
Calciumdistearat Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
