The Synthesis of Dehydroabietyl Lignin Amine and Its Surface Activity
The N-(2-aminoethyl) dehydroabietic acid amide (ADRA)was prepared from dehydroabietic acid and 1,2-ethylenediamine. The mediator ADRA-F-KL was synthesized from Kraft lignin( KL), ADRA and formaldehyde (ADRA-F-KL) by mannich reaction. The effects of reaction temperature,reaction time,the molar ratio of reactants on nitrogen contents of ADRA-F-KL were investigated. Cationic composite emulsifier(ADRA-DETA-F-KL) was prepared from ADRA-F-KL, formaldehyde and diethylenetriamine(DETA). The experiments showed that the optimum reaction conditions of ADRA-F-KL were 3h of reaction time, n(KL)∶n(ADRA) = 1∶0.25, 90℃ of reaction temperature. The IR, elemental analysis and surface tension of the target product showed that the corresponding amine-methyl groups were introduced into KL by the Mannich reaction. The minimum surface tension value of ADRA-DETA-F-KL was 48.5 mN/m in dilute hydrochloric acid solution with 2 of pH value. Compared to the lignin modified by diethylenetriamine/formaldehyde whose minimum surface tension is 57.80 mN/m, the surface activity of ADRA-DETA-F-KL is improved greatly.
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