Abstract: The effects of additives, such as salts, alcohol, carboxylic acid and ionic surfactant on the cloud ponit of nonionic surfactant dodecylpolyoxyethylene polyoxypropylene ether were studied in the paper. It was found that the change of CPvalue coursed by salts followed the Schott additivity regulation and was determined by the characteristic of salts(such as charge of ions) and surfactants(such as group numbers of oxyethylene and oxypropylene); the effects of organic substances on the CPvalue of nonionic surfactant varied if the additives have a different kind of hydrophilic head or carbon chain length; the formation of mixmicell could be the reason why ionic surfactants greatly increased the CPvalue of nonionic surfactant, but more detail studies were needed to find the regulation.

Key words: Dodecylpolyoxyethylene polyoxypropylene ether, Cloud point, Additives