Fluorine surfactants have high thermal and chemical stability

2020-10-14 15:16:02

A surfactant in which the hydrogen atoms of the hydrocarbon chain in the surfactant molecule are completely or partially replaced by fluorine atoms.

Fluorinated surfactants can be called both fluorocarbon surfactants and fluorocarbon surfactants. Their unique properties can be summarized as "three high" and "two hydrophobic", that is, high surface activity, high thermal stability and high chemical stability. Its fluoroalkyl groups are both hydrophobic and oleophobic. The unique properties of fluorine surfactants are related to the properties of fluorine atoms and carbon fluorine bonds. First of all, because fluorine is a highly electronegative element, the bond energy of C-F bond is very high. Secondly, the radius of covalently bonded fluorine atom is larger than that of hydrogen atom, which can effectively protect perfluorinated C-C bond. Therefore, fluorine surfactants have high thermal and chemical stability.

The surface tension of its aqueous solution is usually lower than 20Mn / m, and it can not only reduce the surface tension of water, but also the surface tension of oil.

This kind of surfactant is stable in chemical property, resistant to acid, alkali and high temperature. It can be used as fire extinguishing agent of oil and water as well as evaporation inhibition of oil and water. The commonly used fluorinated surfactants are sodium perfluorooctanoate and sodium perfluorooctanesulfonate. Due to the high price, the application of these surfactants is limited.

Because FS is a kind of high-performance product, it plays an irreplaceable role in many special fields. At the same time, it can also be used as a special additive to enhance the efficiency of common surfactants. By adding a small amount of FS, the performance of common surfactants can be greatly improved, and sometimes unexpected effects can be achieved. Looking at the relevant literature, it is found that there is not much introduction on the application occasions or specific application fields of all kinds of FS or some fluorine-containing compounds products, especially the reports on the specific examples of social effects and economic benefits produced by their special properties. On the other hand, because the commodity price of FS is relatively higher than that of common surfactants, the commercial price of FS is relatively higher than that of common surfactants In the field where surfactants are often used, a large number of them have not been put into use. Therefore, the popularization and application of FS have some limitations, which makes the development and application of FS slow down. In order to make FS products put into the market as soon as possible and benefit human beings, the relevant scientific research and production personnel are constantly updating the technology and reducing the cost, so that the FS products developed can meet the requirements of users as soon as possible.