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Classification, type and application of stearic acid

Published:

2021-07-29

Chinese Name: Stearic Acid Alternative Name: Octadecylic Acid
Chemical formula: C18H3602 Molecular weight: 284.48
Production mode: oil hydrolysis production
The industrial products are white or yellowish particles or blocks, which are a mixture of 45% stearic acid and 55% palmitic acid, and contain a small amount of oleic acid with a slight fatty smell.
gradation
Domestic executive standard: GB9103-88

Industrial products can be divided into first class (formerly called three presses, after three presses), second class (formerly called two presses, after two presses) and third class (formerly called one press, after one press or without press). It is a mixed acid mainly composed of stearic acid and palmitic acid. The primary and secondary stearic acids are white waxy solids with luster or crystals. The tertiary stearic acid is a yellowish waxy solid. The tertiary acid is also called cosmetic stearic acid. The tertiary acid is rubber stearic acid, and the secondary acid is between the two. The products used by customers with low quality requirements, such as mid-range hard salt, are not very high. The primary stearic acid can be used in the food industry. The primary acid mainly uses plant raw materials, also known as plant acid. Tertiary acid is animal raw material, generally animal acid.
At present, the common models on the market are 1801, 1803, 1805, 1806, 1809, 1810, 1835, 1836, 1837, 1838, 1839, 1840, 1841, 1842, 1845, 1850, 1855, 1865, 1870, 1818, 1895, 1896. The front 18 indicates C18, and the price is high if the content of C18 is high.
Among the domestic models, Model 200 is the first grade, Model 400 is the second grade, and Model 800 is the third grade; Among the imported models, 1865 is a special product, 1801 is a first class product, 1820 and 1825 are second class products, and 1810 is a third class product.
application
Industry
Stearic acid is widely used in making cosmetics, plastic cold resistant plasticizers, release agents, stabilizers, surfactants, rubber vulcanization accelerators, waterproof agents, polishing agents, metal soaps, metal mineral flotation agents, softeners, pharmaceuticals and other organic chemicals.
In addition, it can also be used as solvent of oil soluble pigment, crayon toner, wax paper polish, emulsifier of stearic acid glyceride, etc.
The product is used in the food industry as a lubricant, defoamer and raw material for food additives such as glyceride stearate, sorbitol stearate and sucrose ester. Stearic acid, the raw material used as auxiliary agent and the raw material of daily chemical products, is widely used in the manufacture of Pv ℃ plastic pipes, plates, profiles and films. It is a PVC heat stabilizer with good lubricity and good light and heat stability. In plastic PVC pipes, stearic acid helps to prevent "coking" during processing. Adding stearic acid in PVC film processing is an effective heat stabilizer, and can also prevent discoloration of finished film caused by exposure to sulfide. Industrial stearic acid plays an important role in rubber synthesis and processing. Stearic acid is a vulcanizing active agent widely used in natural rubber, synthetic rubber and latex, and can also be used as plasticizer and softener. Stearic acid needs to be added as emulsifier in the production of synthetic rubber. In the production of foam rubber, stearic acid can be used as foaming agent and release agent of rubber products.
Cosmetic industry
Stearic acid is used in two types of skin care products: cream and cold cream to emulsify, so that it can become a stable and white cream. Stearic acid is also the main raw material for almond honey and milk. Stearic acid soap esters are more widely used in cosmetics industry