By decreasing surface tension, improvement in wetting, penetration, and leveling properties of various substrates can be realized.
Typically, a leveling property of floor wax of the aqueous emulsion type is improved by adding several ten to one hundred ppm of it.
Similarly, by adding to an aqueous emulsion,
a penetration property to fibers and so forth can be expressed. In the non-aqueous system, for example, a leveling property is given by adding to a resist having PGMEA (propylene glycol monomethyl ether acetate) as a main solvent.
The most widely used application of the fluorinated surfactant is in the field wherein this function to improve leveling and wetting properties is utilized.
The floor wax mentioned above is the most representative example; other widely used applications include cleaners in the same cleaning field, and in the fields of coating, pigment, and ink.
Floor finish Cleaner Remover Resist Aqueous film forming foam(AFFF) Paint·Ink Photographic emulsion etc.
●Example Aqueous film forming foam(AFFF)
If the sum of the surface tension of an aqueous solution and the interfacial surface tension between water and oil is smaller than the surface tension of an oil, a droplet of the aqueous solution can spread on an oil layer thereby forming an aqueous film on the oil; and as a result, supply of oxygen to the oil layer is blocked so that a fire can be extinguished by choking.
To cause the phenomenon of water floating on oil, surface tension of the aqueous solution side needs to be drastically lowered (γw needs to be lowered); and this can be done only by a fluorinated surfactant.
For example, a fluorinated surfactant expresses its effect in dispersion of a fluorinated resin such as PTFE (polytetrafluoroethylene).
Firstly, wettability to a fluorinated resin is increased by decreasing surface tension of water or a solvent by a fluorinated surfactant.
Then, the fluorinated surfactant is adsorbed onto the fluorinated resin surface, whereby orientating the perfluoroalkyl group to the fluorinated resin side and the medium-affinity group to the dispersing medium side; and as a result, dispersion stability can be given.
PTFE Pigments etc.
By utilizing a surface migration property of the perfluoroalkyl group, surface modification can be made by internally adding a fluorinated surfactant into a resin.
There are two patterns in expression of the functions: one is to express the function of water repellence and oil repellence by virtue of the surface-migrated fluorine atoms, while the other is to express the function of the non-fluorinated group on the surface by surface-migration of the perfluoroalkyl group of a fluorinated surfactant.
Anti-fogging agent for agricultural film Ski-wax Release film etc.
●Example Fluorosurfactant additive in the resin
In the case that a fluorinated surfactant is mixed inside a resin or the like, migration to the resin surface (bleed-out) also occurs by virtue of Rf (perfluoroalkyl group) thereby expressing the function such as water-repellence and oil repellence.
Alternatively, the perfluoroalkyl group is used only to utilize its migration property to surface, whereby application is also possible such that a property of another group that is bonded thereto may be expressed on the surface.
Water and Oil repellent
It is also possible to add a fluorinated surfactant to a composition which is in the state of liquid of an aqueous or a solvent system so that water repellence and oil repellence may be given during the time of its use.
Fluoroprotein Foam Anti-fogging of glasses etc.
●Example Fluoroprotein foam
This illustrates an application to the chemical with which fire extinction is aimed by choking due to foams generated by using a strongly foamable protein.
An alcohol has a strong foam-breaking property; and thus, the protein foams thereby formed are broken by direct contact with it so that the surface cannot be covered by those foams.
Therefore, a fluorinated surfactant is adsorbed to the protein so that all the foams may be provided with oil-repellent and alcohol-repellent properties. By so doing, foams are not easily broken even if the foams are contacted with an alcohol so that the entire surface can be covered with foams to effect fire extinction by choking.
This is the technology to extinguish an alcoholic fire.
In addition to the above-mentioned, a fluorinated surfactant is applied for various uses such as an emulsifier, a foam stabilizer, and a foaming agent.
Please contact us if you wish to have the sample.