Traditional Culture Encyclopedia - Traditional virtues - Classification of surfactants
Classification of surfactants
Surfactant is a kind of chemical substance, which has the characteristics of dispersion, emulsification, wetting and foam stability. According to their different molecular structures and chemical properties, they can be divided into the following four categories:
Anionic surfactant: a negatively charged group in the molecule, such as sodium dodecyl sulfate and sodium dodecyl benzene sulfonate.
Cationic surfactant: a group with positive charge in the molecule, such as cetyltrimethyl ammonium bromide and cetylpyridinium salt.
Non-ionic surfactant: there are no ionic groups in the molecule, such as octanol polyoxyethylene ether and dodecanol polyoxyethylene ether.
Amphoteric surfactant: The molecule contains both anionic and cationic groups, such as cetyl -N-(2- hydroxyethyl) -N- methyl -3- aminopropionic acid (Brij-58).
The above are the four categories of surfactants. Different types of surfactants have their own characteristics and advantages and disadvantages in different application fields.
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