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Overview of fluorosurfactants:

Fluorinated surfactant (FSA) is a kind of surfactant, which can be called either fluorocarbon surfactant or fluorocarbon surfactant. It is a kind of surfactant with fluorocarbon chain as non-polar group, that is to say, the fluorine atom partially or completely replaces the hydrogen atom on the hydrocarbon chain. The unique properties of fluorocarbon surfactants can be summarized as "three high" and "two abominations", that is, high surface activity, high heat resistance stability and high chemical stability. Its fluoroalkyl group is both hydrophobic and oil repellent. It is widely used in fire control, chemical industry, pesticide, mineral processing, papermaking, leather, textile and other fields.


The unique properties of fluorine surfactants are related to the properties of fluorine atom and carbon fluorine bond. First, because fluorine is the most electronegative element, the bond energy of C-F bond is very high. Secondly, the covalently bonded fluorine atom has a larger radius than the hydrogen atom, which can effectively protect the 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 has stable chemical properties and is resistant to acid, alkali and high temperature. It can be used as an oil fire extinguishing agent and to inhibit the evaporation of water and oil. The commonly used fluorine surfactants are sodium perfluorooctanoate, sodium perfluorooctanesulfonate, etc. Because of the high price, the application of these surfactants is limited.


Chinese Name: fluorine surfactant

Foreign name: fluorinated surface (FSA)



Application scope of fluorosurfactant:


Leveling agent, pigment dispersant and emulsifier of water-based and solvent-based coatings. Widely used in coatings, inks, floor waxes, pesticides, electronic cleaning, electroplating agents and other products.


Application of fluorosurfactant in papermaking:


In the paper industry, fluorine surfactants are mainly used as paper coating aids and water and oil repellents.


With the development of China's economy and the improvement of people's living standards, higher requirements are put forward for the quality of paper and paperboard. Through paper coating, many surface properties of paper can be improved, such as printability, rust and corrosion resistance, water and oil resistance, antistatic, high strength, photographic development, recording and molding, conductivity and decoration. Coated paper can be divided into pigment coated paper, resin coated paper and special coated paper, among which pigment coated paper is a kind of processing paper made by coating pigment, adhesive and auxiliary ingredients on the surface of paper by coater. Fluorosurfactant has important application value in the process of paper coating and coating.


Dispersant


In order to prevent flocculation and sedimentation of the coating and keep the viscosity of the coating as low as possible, so as to obtain good fluidity and coating adaptability, surfactant must be used as dispersant. In order to improve the speed and energy saving of the coating locomotive, it is necessary to use the coating with high solid content. As a kind of surfactant with excellent performance, fluorine surfactant is an ideal paint dispersant because of its little dosage and excellent effect.


Defoamer


After the coating is made, foam will be produced in the process of pump, screen and coating. The coating will produce pinholes, spots and "fish eyes" phenomenon, thus reducing the quality of paper. Therefore, surfactant must be added as a defoamer. Fluorine surfactant can reduce the surface tension to a very low level and has excellent defoaming effect.


Lubricant


In the coating process, there is friction between the roller and the paper surface of the coater, which is easy to produce the phenomenon of "paste head". Therefore, surfactants should be added as lubricants. Because the intermolecular force of fluorine surfactant is very small, it is an ideal material for lubricant.


There are three ways to treat the paper with fluorosurfactant: one is the external type, which is to apply the fluorosurfactant on the surface of the paper directly; the other is the internal type, which is to add the fluorosurfactant in the pulping and then process it; the third is to add the fluorosurfactant on the paper coating, which is to add the fluorosurfactant on the paper before the color treatment In the coating, it is applied on the surface of paper together with the coating, and is firmly combined with the paper by the function of adhesive in the coating. This method can form a layer of water repellent and oil repellent oil layer on the surface of the paper, which is oriented outwards by fluoroalkyl, and can keep the original porosity, flexibility, permeability, appearance and wet strength of the paper, which is incomparable with that of the paper covered with plastic polyethylene film.