Synthesis and Characterization of Diethanolamine-based Lignin Nonionic Surfactant
Alkaline lignin was classificated according to the method of acid precipitation. The classified lignin at pH value 4 - 6 was treated with epichlorohydrin and diethanolamine to prepare diethanolamine-based lignin nonionic surfactant. The structure of the product was characterized by FT-IR and determination of nitrogen content. The surface-active property and solubility were investigated by surface tension experiment and turbidity test. The results showed that solid content of the surfactant is 32.6%, nitrogen content is 1.99%, FT-IR spectrum showed the introduction of diethanolamine into lignin. Surface tension of aqueous solution decreased to 53.27mN/m, indicating the favorable surface activity in aqueous solution. The turbidity determination of blended solution of diethanolamine-based lignin nonionic surfactant(DLNS) with dodecyl sodium sulfate(SDS) showed low turbidity and superior effect in quite a wide range of V(SDS): V(DLNS)20: 3 - 20: 20.
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维普
