The "cosmetics" can be roughly divided into three categories: first cleaning, such as facial cleanser, body wash, laundry detergent, etc. Second skin care, such as moisturizing lotion, moisturizing cream, essence, etc. The second color makeup class, such as foundation liquid, mascara, lip color etc. I think you should use at least one or two of these three products. Life care or skin care in the process of using native will also look at the composition of the labeling on the package, check out these things we use at ordinary times what exactly is made (the cosmetics is composed of which a few part). Despite a certain difference between different cosmetic ingredients, but in addition to the water, but the main is moisturizing agent, thickening agent, preservative, spice, pigment, etc. Several kinds of effective components and surfactant. What is the effect of surfactant, except that some of the other types of surfactants can literally understand their effects? Don't underestimate the surfactant, because they are an integral part of cosmetics.
Surfactant refers to a class of compounds that can reduce the surface tension of liquids, or the interfacial tension of liquid-liquid, liquid-solid phase. This concept is not easy to understand, and we use a typical surfactant used in daily life: laundry detergent. Why is the oil stain on the clothes not easy to wash out and use laundry detergent can remove? This is due to the "bisexuality" of surfactants. The main ingredient of laundry detergent is the fatty acid metal salt (a surfactant), which is easily soluble in water and is called hydrophilic group. The other one is easily soluble in oil, which we call the "oil-friendly group". It is precisely because of this special structure that it can plunge into the water and plunge into the oil, and rub it down from the clothes with the rubbing of the outside force.
Surfactant in cosmetics.
Common skin care cosmetics is generally a lotion or cream shape, the emulsion cream consists of scattered very uniform water oil each other (but not all cosmetics containing fat, such as gels), water and oil originally incompatible, how to make them very uniform stability of peaceful coexistence? The surfactant plays an important role in Emulsification. In aqueous environment, surfactant micelle formation, the oil of the small particles wrapped in the center of the micelle, equivalent to set on the outside of the oil particles on a hydrophilic coat, that they can safely and evenly dispersed in the water, forming stable emulsion cream. When the emulsion cream was applied to the skin, the micelles will break (emulsion), and release the parcel, grease particles, these grease particles on the surface of the skin form a thin layer of oil film to protect the moisture in the skin from loss, of course one of the active ingredients will be absorbed by skin.
There are many kinds of surfactants. The surface active agent in cleaning cosmetics is its main component, the main function is to remove dirt and scale. Of course, these surface activities are more exciting and should be cleaned in the process so as not to cause damage to the skin. However, skin care cosmetics can choose the surface active agent which is not stimulating and can not cause allergic reaction.
Thus it can be seen that surfactants play a variety of roles in cosmetics, such as cleaning and emulsification, and cosmetics cannot be separated from them. Moreover, the new surfactant, liposome, which has been used in cosmetics in recent decades, makes cosmetics more effective.