Main Functions Of Surfactant
（1）Emulsification: the oil has big surface tension in the water, so when water is dripped into the oil and stirred with efforts, the oil will be turned into fine beads and emulsion will appear due to the mixup but the layering will come out when the stirring stops. If surfactant is added and it is stirred forcibly, it is not easy for layering show up for a long time when the stirring is cut off, which is emulsification. The reason is that the hydrophobicity of oil is surrounded by hydrophilic group of active agent, leading to directional attraction so that the work needed for oil to disperse in the water is emusified by oil.
（2）Wetting: a wax, grease or scarly substances that are hydrophocibity will cover on the surfaces of components. Because of the pollution from these substances, it makes it difficult for the surfaces of components to be wet. When surfactant is put into aqueous solution is put into, the beads on the components find it easy to disperse, lowering the surface tension of them and achieving the goal of wetting.
（3）Solubilization: the grease can be “dissolved” only if surfactant is added. However, this kind of dissolution will occur only when the concentration of surfactant reaches the critical concentration of colloid. How the solubility is depends on the objects and properties for solubilization. As for solubilicity, its long hydrocarbon chain of hydrophobic gene is stronger than the short one and the saturated hydrocarbon chain is better than unsaturated one. The solubilization of non-ion surface active agent is rather significant.
（4）Dispersing: solid particles like dust and dirt will flock together easily, they will have settlement in the water without any difficulty. The molecules of surfactant can break the aggregate of solid particles into tiny ones, making it suspend and disperse in the solution, which plays a role in pushing solid particles to scatter evenly.
（5）Foaming effect: why bubbles form is because the oriented absorption of active agent and also is because the reduction of surface tension between gas and liquid. In general, the active agent with low molecule is easy to be foaming while the high one is not. Myristic acid yellow has the highest foaming property but sodium stearate has the worst. Anionic active agent has better foaminess and foam stability than non-ion type such as sodium alkylbenzene sulfonate. The foam stabilizer used commonly contains fat aliphatic alcohol and carboxymethyl cellulose and foaming inhibitor includes delspray, aliphatic ester, polyether and other non-ion surfactant.
- December 17, 2018Surfactant can be applied to citizen’s daily life and industries. It is said from some information that 2/3 of those for civil use are applied in personal care products; the composite detergent is on...view
- January 25, 2019Commonly used such active agents are fatty alcohol polyoxyethylene ether sulfate and sodium lauryl sulfate. The fatty alcohol polyoxyethylene ether sulfate is aliased to AES, sodium alcohol ether sulf...view
- January 25, 2019Suspension dispersionThe process by which insoluble solids are dispersed into a solution to form a suspension with very small particles is called dispersion. The surfactant which acts to promote solid...view
- January 25, 2019Based on different functions, the surfactant used in coating industry can be classified as following:Emulsifier,surface treatment agent, wetting dispersant of pigment, defoamer, flatting agent, mould ...view
- January 25, 2019SterilizationThe quaternary ammonium salt bactericide has the property of an ionic compound, which is highly soluble in water and is insoluble in a non-polar solvent, with stable Chemical properties. ...view
- January 25, 2019Such active sodium linear alkylbenzene sulfonate and sodium α-alkenyl sulfonate are common. Sodium linear alkylbenzene sulfonate, LAS or ABS, is a white or light yellow powder or flake solid, soluble...view