木质素磺酸钙共聚物高吸水树脂合成研究

 木质素磺酸钙接枝高吸水树脂是一种含有亲水基团的新型高分子网状聚合物,具有极强的吸水性能.以木质素磺酸钙接枝高吸水树脂为对象,系统地研究了其制备方法、形态结构特征以及作为土壤保墒剂的应用.研究了合成木质素磺酸钙接枝高吸水树脂的工艺条件,得出木质素磺酸钙用量、引发剂种类及用量、交联剂种类及用量、丙烯酰胺用量、中和度、干燥条件等因素对高吸水树脂洗液性能的影响规律,通过单因素法得出试验体系下最佳工艺参数(质量分数):丙烯酸58.5%,丙烯酰胺19.5%,木质素磺酸钙5.85%,引发剂0.39%,交联剂0.19%,中和液15.59%.在此条件下,得到树脂吸去离子水1010g/g,吸0.9% NaCl溶液量110g/g.用红外谱图和扫描电镜分析了合成高吸水树脂的形态和结构,发现共聚物的组成对高吸水树脂的分解温度和表面形态结构特征都存在较大影响.

Synthesis of Water-absorbent Resin from Calcium Lignosulfonate

Calcium Lignosulfonate(CL), with its good performance and cheap price, is widely used as a water reducer. But CL as a superabsorbent resin additive is not well studied. CL super absorbent resin is a kind of new macromolecular network polymer materials, containing hydrophilic groups, which could absorb a large amount of water. This paper studies its preparation process, morphology and structural characterization, and the application in soil. The synthesis of CL superabsorbents is presented. The influence of several factors on absorbency is discussed: the component of CL, the type and amount of initiator, the type and amount of crosslinker, the amount of acrylamide, the neutralization degree, and the drying conditions. Using the single-factor method, the optimum process parameters in this experiment system are obtained (in wt%): acrylic 58.5%, acrylamide 19.5%, calcium lignosulfonate 5.85%, initiator 0.39%, cross-linker 0.19%, and neutralization 15.59%. The copolymers are characterized by IR spectosocopy, thermal analysis and Scanning Electronic Microcopy(SEM). It is shown to have a good thermal stability, and the components of comonomers influence the resin's decomposition temperature and surface morphological characterization notably.