碱木质素改性及其产物表面活性的研究

Modification of Alkali Lignin and Surface Activities of the Modified Products

通过将竹材碱水煮烷基化、氧化，提高其余水性能，以达到改善其表面活性的目的。先将碱木素的酚羟基与卤代烷烃反应醚化，带上亲油性的烷烃基，再用氧化剂如硝酸、高锰酸钾、高碘酸钠将其侧链氧化成羧基，加入NaOH中和后得到亲水性孩酸钠盐。考察了反应温度、溶液pH值对本素烷基化反应的影响，不同的氧化剂氧化对氧化产物结构及表面活性的影响。所得产物降低表面张力的能力超过了十二烷基磷酸钠及十二烷基苯磷酸钠，降低界面张力的能力与十二烷基苯磷酸钠接近。

Surface activities of bamboo alkali lignin were improved by alkylation and oxidation. Oil - soluble intermediates were synthesized by reaction of bamboo alkali lignin with alkyl halide.Several high surface activitiy products were obtained by oxidation of these intermediates. The induences of teaction temperature and pH on alkylation, and effects of different oxidizing agents on surface tension and interfacial tension of the products were investigated.