Жирные кислоты-хлопковое масло

Description

Cottonseed oil fatty acids are a mixture of natural fatty acids obtained by hydrolysis (saponification) of cottonseed oil. Commodity category, not individual compound: comprises predominantly palmitic, oleic and linoleic acids in proportions characteristic of the triglyceride composition of cottonseed oil. The input dump for the product in the original table contained a minimum of information, so the characteristic was supplemented from general data on the composition of fatty acids of cottonseed oil.

Identification

• CAS number: 68308-51-0
• English name: Fatty acids, cottonseed-oil
• EU number: 269-656-5
• Synonyms: Cottonseed-oil fatty acids, Emery vegetable fatty acid 600, Emery 600, neo-Fat 95, neo-Fat 105, neo-Fat 140
• Related CAS numbers of product forms: 8034-66-0, 8045-94-1, 8045-88-3, 8045-89-4

Chemical composition

A mixture of straight chain fatty acids typical of cottonseed oil: palmitic acid (C16:0), oleic acid (C18:1) and linoleic acid (C18:2) predominate, with minor amounts of stearic and myristic acids. The exact percentage varies depending on the cotton variety, growing region and method of raw material processing and is not given in the source data.

Scope of application

Used in paint and varnish resins (alkyd and other film-forming systems based on vegetable fatty acids), polyamide resins, plasticizers, softeners for the textile industry. Fatty acids from vegetable oils are generally used as feedstock for the synthesis of soaps, emulsifiers, lubricants and surfactants.

Storage and transportation

As a mixture of natural fatty acids, the product is stored in an airtight container in a cool, dry room, away from strong oxidizing agents - unsaturated fatty acids (oleic, linoleic) are susceptible to oxidative rancidity when exposed to air and light.

Receipt

The product is obtained by hydrolysis (saponification or splitting under pressure with steam) of triglycerides of cottonseed oil - vegetable fat isolated from cotton seeds after separation of the fiber. The separation of fatty acids and glycerol phase is carried out in continuous fat digestion plants, after which the fatty acid mixture is, if necessary, partially fractionated according to chain length and degree of saturation to obtain commercial grades (Emery 600, neo-Fat 95/105/140).

Trademarks

Different brands (Emery vegetable fatty acid 600, neo-Fat series) differ in the degree of purity, color and content of unsaturated components, which determines their suitability for a specific technological process - from alkyd resins to textile softeners.

Role in alkyd resins

In the production of alkyd resins, the fatty acids of cottonseed oil work as a modifier, built into the polyester chain through a transesterification reaction with glycerin and phthalic anhydride: the proportion of unsaturated acids determines the ability of the film to oxidative drying in air, and the proportion of saturated acids determines the hardness and gloss of the coating.