黄原胶改性制备高吸水性树脂的研究

以丙烯酸(AA)和丙烯酰胺(AM)为黄原胶(XG)的接枝改性剂,采用反向悬浮聚合法制备了高吸水性树脂——接枝改性共聚物(XG-g-AA/AM)。采用U*10(104)均匀设计法对XG-g-AA/AM的合成工艺进行了优化。结果表明:XG-g-AA/AM的最佳合成条件为m(AA)=10.0 g、w(引发剂)=0.5%(相对于单体总质量而言)、AA中和度80%和反应温度60℃,此时XG-g-AA/AM的吸水倍率为890.1 g/g、吸盐水倍率为172.2 g/g;热失重分析(TGA)结果显示,XG-g-AA/AM的热稳定性优于XG;扫描电镜(SEM)观测结果显示,XG-g-AA/AM表面形成的多孔网络结构,有利于其对水分子的接触与吸附。

Study on preparing superabsorbent polymer modified by xanthan gum

With acrylic acid(AA) and acrylamide(AM) as graft-modifier of xanthan gum(XG),a superabsorbent polymernamely graft modified copolymer(XG-g-AA/AM)] was prepared by inverse suspension polymerization.The synthesis process of XG-g-AA/AM was optimized by U*10(104)-uniform design experiment.The results showed that the optimal synthesis conditions of XG-g-AA/AM were obtained when AA was 10 g,mass fraction of initiator was 0.5% in total monomers,AA's neutralisation degree was 80%,and reaction temperature was 60 ℃.Here,its water absorbency or salt-water absorbency were 890.1 g/g or 172.2 g/g.TGA(thermal gravimetric analysis) results showed that the thermal stability of XG-g-AA/AM was better than that of XG.SEM(scanning electron microscope) observations showed that the XG-g-AA/AM could better contact and adsorb water molecules because XG-g-AA/AM surface had a porous network structure.