An organic compound that forms a stable emulsion from a nonsoluble liquid. They are all surface-active substances that reduce the amount of fluid between liquids
The interfacial tension makes the non-soluble liquid easy to emulsify. When emulsified, the dispersed phase is in the form of small droplets (ranging in diameter from 0.1 microns to dozens of microns)
The emulsifier forms a thin film or double layer on the surface of these droplets to prevent them from condensing.
Keep the emulsion stable. Emulsion is a heterogeneous system. The most common is water as a continuous phase and organic liquids that are insoluble in water as dispersions
Phase hydroencapsulated oil emulsion. There are also water-dispersed phase and water-insoluble organic liquid as continuous phase. You have to make it stable
The emulsifying agent of a single component can be added to the emulsifying agent of the emulsion, or several emulsifying agents can be added at the same time.
The emulsifier has two parts, hydrophilic and oil - friendly. According to the characteristics of their hydrophilic parts, they can be classified into the following categories: declared negative ionic emulsifiers.
An emulsifier, such as carboxylate, sulfate, and sulfonate, that disassociates in water to form a negative ion hydrophilic group with an alkyl or an aryl group. This kind of emulsion
The most commonly used agents are soap (c15-17h31-37coona), sodium stearate (C17H35COONa), sodium dodecyl sulfate
Salt (C12H25OSO3Na) and calcium dodecyl benzene sulfonate, etc. Negative ionic emulsifiers are required to be used in alkaline or neutral conditions. In the use of more
The negative ionic emulsifiers can be mixed with each other or with non-ionic emulsifiers when preparing emulsion. Negative ionic sum
Nonionic emulsifiers cannot be used in a single emulsion at the same time. If mixed, the stability of the emulsion will be damaged. Parliamentary vacuum type emulsifier
. It ionizes in water to form a positive ion hydrophilic group with an alkyl group or an aryl group. These emulsifiers are relatively rare and are derivatives of amines such as N-
Dodecyl dimethylamine, used in polymerization. Chemical nonionic emulsifier. It is characterized by no ionization in water. Its hydrophilic part is the various poles
Sexual groups, common polyoxyethylene ether and polyoxypropylene ether. Its oil - loving parts (alkyl or aryl) bind directly to oxyethylene ether bonds. Canon
P octyl phenol polyoxyethylene ether:
The oxygen atoms in the polyether chain of the non-ionic emulsifiers can associate with water to form hydrogen bonds, which can be dissolved in water. It can be acidic
It can also be used in alkaline conditions and has good emulsifying effect. It is widely used in chemical, textile, pesticide, petroleum and latex production.