Unique molecular structure of fluorine-containing nonionic surfactants

Unique molecular structure of fluorine-containing nonionic surfactants

With the development of science and technology and the advancement of society, the role of surfactants with “industrial MSG” has become more and more important in the fields of daily life, industrial and agricultural production and national defense technology. In actual use, it has been found that the addition of conventional surfactants often fails to meet certain special requirements or has certain deficiencies. Therefore, researchers at home and abroad have synthesized fluorine, silicon, boron and other elements. Special surfactants, these special surfaces。The active agent has properties that cannot be replaced by conventional surfactants.

Fluorosurfactants are an important class of specialty surfactants and are used in a wide variety of applications including biomedical, fire protection applications, cosmetics, lubricants, paints, polishing and adhesives. The unique C-F bond in its molecular structure gives these surfactants "three high and two bismuth" characteristics: high surface activity, high chemical stability, high heat stability and fluorocarbon chain. Characteristics. Studies have shown that fluorosurfactants are the most surface active of all surfactants to date, and the critical micelle concentration of aqueous solutions and the surface tension at critical micelle concentrations are much lower than those of hydrocarbon surfactants. From the ability to reduce the surface tension, the minimum surface tension of the fluorosurfactant aqueous solution can reach 20 mN/m or less, or even about 15 mN/m. The surface tension of aqueous hydrocarbon surfactant solutions is generally only as low as 30~35 mN/m [9]. In terms of the efficiency of lowering the surface tension, the fluorosurfactant is generally used in the tens of thousands of places, and the surface tension of the aqueous solution can be significantly reduced at a lower concentration, and the amount of use of the hydrocarbon surfactant to achieve the minimum surface tension is required. In the percentile . And in extreme environments such as strong acid, alkali, high temperature and high heat, the fluorosurfactant still has stable surface activity.