Synthesis and properties of sodium nonylcyclohexanol ethoxylates sulfate
Substitute for sodium nonylphenol ethoxylate sulfate is in urgent need due to its aquatic toxicity.Nonyl cyclohexanol ethoxylates,with a higher safety profile and similar physicochemical properties to nonylphenol ethoxylates,have been considered as potential alternatives.Herein,sodium nonylcyclohexanol ethoxylates sulfate were synthesized using nonylcyclohexanol ethoxylates as raw materials and chlorosulfonic acid as sulfation reagent,in which the esterification rates toward sodium nonylcyclohexanol ethoxylate(5)sulfate and sodium nonyl cyclohexanol ethoxylate(9)sulfate(5 and 9 represent the number of ethylene oxide addition)could reach 90.91%and 91.06%,respectively.The results indicated that the aqueous solution of sodium nonylcyclohexanol ethoxylate(5)sulfate exhibited similar interfacial activity as that of sodium alkyl ethoxylate(3)sulfate(AES).Sodium nonylcyclohexanol ethoxylates sulfate presented comparable wetting and foaming properties as nonylcyclohexanol ethoxylates,and better wetting,foaming as well as emulsifying performance than AES.
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