822-16-2
Sodium Stearate
CAS: 822-16-2
Molecular Formula: C18H35NaO2
822-16-2 - Names and Identifiers
| Name | Sodium Stearate |
| Synonyms | flexichemb prodhygine bonderlube235 Natriumstearat Sodium Stearate stearatedesodium Sodium Octadecanoate stearicacid,sodiumsalt,mixtureofstearicandpalmiticfattychain Octadecanoic acid sodium salt, Stearic acid sodium salt |
| CAS | 822-16-2 |
| EINECS | 212-490-5 |
| InChI | InChI=1/C18H36O2.Na/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20;/h2-17H2,1H3,(H,19,20);/q;+1/p-1 |
| InChIKey | RYYKJJJTJZKILX-UHFFFAOYSA-M |
822-16-2 - Physico-chemical Properties
| Molecular Formula | C18H35NaO2 |
| Molar Mass | 306.45907 |
| Density | 1.07 g/cm3 |
| Melting Point | 270 °C |
| Boling Point | 359.4°C at 760 mmHg |
| Flash Point | 162.4°C |
| Water Solubility | SOLUBLE IN COLD AND HOT WATER |
| Solubility | Slowly soluble in cold water. Solubility increases with temperature |
| Vapor Presure | 8.58E-06mmHg at 25°C |
| Appearance | Powder |
| Color | white |
| Exposure Limit | ACGIH: TWA 10 mg/m3; TWA 3 mg/m3 |
| Merck | 14,8678 |
| BRN | 3576813 |
| Storage Condition | 2-8°C |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| MDL | MFCD00036404 |
| Physical and Chemical Properties | Appearance of white powder, with fat odor, a smooth feeling, soluble in hot water and ethanol, acid decomposition into stearic acid and the corresponding sodium salt. |
| Use | Used in the manufacture of toothpaste, also used as a water repellent, plastic stabilizer. Widely used in food, medicine, cosmetics, plastics, metal processing, metal cutting, etc., also used in acrylate rubber soap/sulfur and vulcanization system. It is mainly used as emulsifier, dispersant, lubricant, surface treatment agent, corrosion inhibitor, etc. |
822-16-2 - Risk and Safety
| Safety Description | 24/25 - Avoid contact with skin and eyes. |
| UN IDs | 3077 |
| WGK Germany | 1 |
| RTECS | WI4725000 |
| TSCA | Yes |
| HS Code | 29157090 |
| Hazard Class | 9 |
| Packing Group | III |
822-16-2 - Upstream Downstream Industry
| Raw Materials | Sodium hydroxide Stearic acid |
822-16-2 - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Overview | sodium stearate is a white oily powder with a smooth feel and fatty odor. Soluble in hot water or hot alcohol. The aqueous solution is alkaline due to hydrolysis, and the alcoholic solution is neutral. It is prepared by the interaction of decanoic acid and sodium hydroxide. Used in the manufacture of toothpaste, also used as a water repellent and plastic stabilizer. |
| properties | sodium stearate is a white powder, slightly soluble in cold water, can quickly dissolve in hot water, the concentrated hot soap solution did not crystallize after cooling. With excellent emulsification, penetration and detergency, there is a smooth feeling, fat odor. Soluble in hot water or alcohol water, the solution is alkaline due to hydrolysis. |
| uses | The main uses of sodium stearate: thickener; Emulsifier; Dispersant; Binder; Corrosion inhibitor 1, detergent: for the control of foam during rinsing. 2, emulsifier or dispersant: For the emulsification of polymer and antioxidant medium. 3. Corrosion inhibitor: cluster packaging film to make it have protective properties. 4. Cosmetics: shaving gel, transparent viscose, etc. 5. Adhesive: used as a natural glue to paste paper pieces. It is used in the manufacture of soap detergents and as an emulsifier in cosmetics. used as metal heat treatment and plastic stabilizer used in the manufacture of toothpaste, also used as waterproof agent, plastic stabilizer used as PVC heat stabilizer, and cosmetics flour, emollient ointment and pharmaceutical tablet raw materials (excipients, lubricants); Used in the school Wood powder to make the lubrication bright and transparent; Paint industry as a transparent flat light agent. The metal soaps used as the polyvinyl chloride stabilizer are mostly higher fatty acid salts of cadmium, barium, calcium, zinc and magnesium, and the base is a salt of stearic acid which is lauric acid. The performance of the metal soap stabilizer varies with the type of metal and the acid radical, and the general rules are as follows: heat resistance: cadmium, zinc soap early heat resistance; Barium, calcium, magnesium, strontium soap long-term heat resistance is good, lead soap in the middle. Weather Resistance: cadmium, zinc, lead, barium, tin soap better. Processability: lead and cadmium soap have good lubricity, but acid radicals also have great influence on lubricity. Widely used in food, medicine, coatings, plastics, rubber, textile, etc. |
| sodium stearate | sodium stearate is the sodium salt of stearic acid, also known as sodium octanoate, which is the main component of commonly used anionic surfactants and soaps. The hydrocarbyl moiety in the sodium stearate molecule is a hydrophobic group and the carboxyl moiety is a hydrophilic group. In the soap water, the sodium stearate exists as micelles, the micelles are spherical, composed of many molecules, the hydrophobic groups of which are inward, combined with each other by van der Waals force, and the hydrophilic groups are distributed on the surface of the micelles. The micelles are dispersed in water, and the oil is insoluble in water, and the oil can be dispersed into fine oil beads. The hydrophobic base of sodium stearate is dissolved into the oil, while the hydrophilic base is left on the surface of the oil beads, the oil droplets can be suspended in water to play a role in decontamination. In hard water, stearate ions combine with calcium and magnesium ions to form water-insoluble calcium and magnesium salts, which reduce the detergency. In addition to sodium stearate, soap also contains sodium palmitate CH3(CH2)14COONa and sodium salts of other fatty acids (c12-c20). Saponification reaction of natural oil, such as tallow, with aqueous sodium hydroxide solution to obtain soap and glycerin: Figure 1 is the saponification reaction of natural oil to prepare sodium stearate. most vegetable oils contain unsaturated fatty acids with 18 carbon atoms. After catalytic hydrogenation, saturated fatty acid glycerides are obtained, and then saponified to obtain soap with sodium stearate as the main component. |
| production method | add stearic acid to the reaction kettle, heat to melt, and add aqueous NaOH solution with stirring, heating at 65 C for 2H, the pH value is controlled at 8.0~8.5. The product was obtained by spray-drying. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 21:01:54
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Raw Materials for 822-16-2