In the production of cosmetics, especially in the scientific research of cosmetics, emulsions are often a very important topic for technicians to study. What are the classifications of emulsions dispersed by high-shear emulsifiers? Now let's learn this together.
Nowadays, emulsions are often divided into three categories according to the size of the dispersed phase droplets of the high-shear emulsifier: microemulsions (micro emulsions) are translucent or transparent liquids whose diameter is less than 100nm (011^m); The droplet diameter of the emulsion (mini iemulsions) is between the above two types (100nm~400nm, 011^m~014^m), and it is a blue-white liquid. Coarse emulsions (macro emulsions), the diameter of the droplets is greater than 400nm (014^m), the shape and size of the droplets can be observed under an optical microscope, and they are blue-white to milky white, usually called emulsions or emulsions; common in the cosmetics industry Creams, lotions, hair creams and conditioners are fine emulsions; some transparent gel-type products, transparent shampoos and body washes are microemulsions.
Strictly speaking, the phase separation contained in the emulsion of many cosmetics is fine, soft waxy semi-solid particles; these particles are heated to high temperature (above 70 degrees Celsius) to melt in the medium of a high-shear emulsifier, and are emulsified into fine liquid After cooling, it forms semi-solid particles, which are processed by a high-shear emulsifier and dispersed evenly in the medium. In addition, some cosmetic emulsions often add some solid powders (such as titanium dioxide, talcum powder and coloring agents, etc.), and these products are actually suspensions formed by dispersing solid powders in emulsions. The presence of fine powder can increase the stability of the system.
