All anionic surfactants have good foaming property

2020-06-30 11:32:52

Surfactants, also known as interfacial active agents, are organic compounds that greatly reduce the interfacial tension of solutions at low concentrations. The molecules contain hydrophilic polar groups (such as hydroxyl, carboxyl, sulfate, amino and ether bonds) and hydrophobic nonpolar groups (such as various C-H chains). According to their structures, they can be divided into four types: anionic, cationic, nonionic and amphoteric.

The surfactants in the solution are aligned by the adsorption of polar and non-polar groups at the interface, forming a boundary film, reducing the surface tension of the solution and exhibiting strong interfacial activity. With the increase of surfactant concentration, the formation of the micelle interfacial film is more compact and the surface tension gradually reaches a small value. The concentration of surfactant is the critical concentration of micelle. The formation of micelles increases the solubility of insoluble substances in solution. In this respect, surfactants also have solubilization.

Due to the interfacial activity, micellization and solubilization of surfactants, surfactants often show wetting, emulsifying, foaming, dispersing and penetrating in solution. It is easy to adsorb on the surface of oxide film and form interface adsorption film, which can effectively prevent or slow down the hydration reaction on the surface of oxide film and prevent the formation of powdery mildew. Secondly, the wettability and permeability of surfactant can promote the permeation of the sealing liquid into the membrane pore, accelerate the hydration reaction in the pore, and enhance the sealing effect. In addition, surfactants also have the functions of fog suppression, flocculation and decontamination. A kind of

Foam plays an important role in washing. Although the foam itself has no decontamination effect, it can carry dirt and can indicate how much detergent is decontamination.         

A variety of detergents are required to be rich in foam and stable, such as high foam carpet cleaner. For hand sanitizer, hand washing utensils and detergent, foam is also required to be delicate and thick.         

Anionic surfactants have good foaming properties and can produce rich foam. LAS, AOS, FAS and AES are good foaming agents. APG also has good foaming ability.         

When alkanolamide or amine oxide is combined with LAS, Fas, AES, etc., it has good foam stabilizing and foam increasing effects. It is widely used as foam stabilizing and foam increasing agent. In addition, many water-soluble polymer compounds can also be used to stabilize and increase foam.