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What are the Anionic Surfactants?

Feb. 28, 2020

Anionic Surfactant, as the name implies, that is, the hydrophilic group is an anion. In medium to alkaline media, anionic surfactants have better application effects. The ionized part may be carboxylate, sulfonate, sulfate, and phosphoric acid. salt. Anionic surfactants are the products with the longest history of development, the largest output, the most varieties, and the most widely used surfactants. It is the main active ingredient of personal cleaning products such as shampoo, bath liquid, hand sanitizer, and household cleaning products such as dishwashing liquid and liquid detergent. It is also widely used in industry. In recent years, China's surfactant industry has developed rapidly. So what are the specific anionic surfactants? The following Anionic Surfactant Supplier will tell you.


Anionic Surfactant

Anionic Surfactant


Common anionic surfactants include carboxylic acid derivatives, sulfonates, sulfates, phosphates, and N-acylamino carboxylates.


(1) carboxylic acid derivatives

Representative raw materials: carboxylic acid salts (commonly known as fatty acid soaps), carboxylic acid esters and salts, fatty alcohol polyether-n carboxylic acid ester salts. Use in cosmetics: emulsifiers, detergents, etc.

Carboxylate, as an important skin cleansing product, can be used alone or as an additive in combination with synthetic detergents. The actual production and application of fatty acid soaps are made of mixed fatty acids with different carbon chain lengths to obtain better detergency and emulsification properties. However, the disadvantages of fatty acid soaps are that they are not resistant to hard water, acid, and alkaline solutions . Moreover, in the formula system, fatty acid soap will freely precipitate when it encounters inorganic acid, which makes the emulsification of the soap weaken or even disappear completely.

Carboxylic acid esters and salts, including mono-, di-, and tri-esters of di- or tri-carboxylic acids. The structural feature of this kind of surface activity is that the carboxylic acid group forms a hydrophilic anion, and the linking part with the ester is a lipophilic group. Can be used as wetting agent, foaming agent, cleaning agent, thickener. Fatty alcohol polyether-n carboxylic acid ester salt is a product formed by the reaction of sodium chloroacetate and fatty alcohol polyether. It is more soluble in water than soaps, is not affected by electrolytes and hard water, and has good wetting effect. Used as hair conditioner and thickener.


(2) Sulfonate

Representative raw materials: alkyl sulfonate, alkyl benzene sulfonate, alkyl naphthalene sulfonate, succinate sulfonate, etc. The general formula is RSO3M, where R may be a straight-chain alkane or alkene, branched alkane or alkene, etc .; M-position K +, Na +, N + H (CH2CH2OH) 3, etc., the most practical application is sodium sulfonate. This kind of raw material has better resistance to acid and alkali and hard water than soap, and its emulsifying ability is much better than soap. The main purpose of use is: emulsifier, cleaner, foaming agent.

For example: Dodecylbenzene Sulfonates, white or slightly yellow powder, has decontamination, wetting, foaming, emulsifying and dispersing properties. It is soluble in water to form a translucent solution, and is stable to alkali, dilute acid and hard water.


(3) sulfate salt

The difference between the sulfate ester surfactant and the sulfonate surfactant is that the hydrophilic group of the sulfate salt is connected through an oxygen atom, ie, a C-O-S bond, and the sulfonate salt is directly connected through a C-S bond. C-O-S bonds are more easily hydrolyzed than C-S bonds. Representative raw materials: fatty alcohol sulfate, castor oil sulfate, sulfated butyl ricinate. The most practical application is the fatty alcohol sulfate salt, which is prepared by sulphating a higher alcohol and then neutralizing it with a base. The hydrophilic group of this kind of raw material is a sulfuric acid group, which has a negative charge, and the part having surface activity when dissolved in water is an anion. Has good wetting power, emulsifying power and detergency.


(4) phosphate ester salt

Representative raw materials: higher alcohol phosphate monoester salt, higher alcohol phosphate diester salt. Monoesters are easily soluble in water, while diesters are more difficult to dissolve in water and become emulsified. The general product is a mixture of the two.


(5) N-acylaminocarboxylate

N-acyl amino acid is prepared by acylating the amino group of a-amino acid. The acyl group can be introduced by a single fatty acid or natural fatty acid. Since the amino group in the amino acid is electrically neutralized, the acylated amino acid is different from the general amino acid and belongs to anion. Surfactant. Because it contains carboxylate, it has strong hydrophilicity and contains 3-6 amino acids. It has protein-like properties. It is easy to bind proteins and remove stains. It has strong emulsification ability, good heat resistance, alkali resistance and hard water resistance.


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