ステアリン酸カルシウム

Calcium stearate/ja
Names
	Preferred IUPAC name Calcium di(octadecanoate)
	Other names E470
Identifiers
CAS Number	1592-23-0 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:190296;
ChEMBL	ChEMBL2106092 ;
ChemSpider	14587 ;
PubChem CID	15324;
UNII	776XM7047L ;
	InChI InChI=1S/2C18H36O2.Ca/c21-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20;/h22-17H2,1H3,(H,19,20);/q;;+2/p-2 Key: CJZGTCYPCWQAJB-UHFFFAOYSA-L ; InChI=1/2C18H36O2.Ca/c21-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20;/h22-17H2,1H3,(H,19,20);/q;;+2/p-2 Key: CJZGTCYPCWQAJB-NUQVWONBAL;
	SMILES [Ca+2].[O-]C(=O)CCCCCCCCCCCCCCCCC.[O-]C(=O)CCCCCCCCCCCCCCCCC;
Properties
Chemical formula	C36H70CaO4
Molar mass	607.030 g·mol−1
Appearance	white to yellowish-white powder
Density	1.08 g/cm3
Melting point	155 °C (311 °F; 428 K)
Solubility in water	0.004 g/100 mL (15 °C)
Solubility	soluble in hot pyridine ; slightly soluble in oil ; insoluble in alcohol, ether
Hazards
NFPA 704 (fire diamond)	2 1 0

ステアリン酸カルシウム（Calcium stearate）は、カルシウムのカルボン酸塩で、カルシウム石鹸に分類される。この塩はいくつかの潤滑剤や界面活性剤、また多くの食品の成分である。白い蝋状の粉末である。

生産と発生

ステアリン酸カルシウムはステアリン酸と酸化カルシウムを加熱することによって生成される：

2 C₁₇H₃₅COOH + CaO → (C₁₇H₃₅COO)₂Ca + H₂O

ステアリン酸カルシウムは石鹸カスの主成分でもあり、石鹸を硬水と混ぜたときにできる白い固体である。ナトリウムやカリウムを含む石鹸とは異なり、ステアリン酸カルシウムは水に溶けず、泡立ちが悪い。商業的には水に50％分散させたもの、またはスプレードライの粉末として販売されている。食品添加物としては、一般的なE番号 E470で知られている。

Applications

Calcium stearate is a waxy material with low solubility in water, unlike traditional sodium and potassium soaps. It is also easy and cheap to produce, and exhibits low toxicity. These attributes are the basis of many of its applications. Related applications exist for the magnesium stearate.

Calcium stearate is used as a flow agent and surface conditioner in some candies such as Smarties, jawbreakers and Sprees.
It is a waterproofing agent for fabrics.
A lubricant in pencils and crayons.
A lubricant in the dry drawing method of wire production
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.
Anticaking agent for drugs etc.