改性方法对玉米秸秆纤维素-腐植酸基吸水树脂性能的影响

Effects of modification methods on the properties of corn straw cellulose-humic acid-based water-absorbent resin

分别采用等离子体和紫外固化法对玉米秸秆纤维素-腐植酸基吸水树脂(CS-HA-PAA)进行改性,通过傅里叶变换红外光谱仪和扫描电子显微镜对改性吸水树脂的结构和形貌进行表征,考察了改性吸水树脂的耐盐性、耐酸碱性、保水性、反复吸液性等性能。结果表明:改性后CS-HA-PAA亲水基团增多,表面粗糙且产生孔洞结构,有利于提高吸水性能;采用最佳工艺条件制备的等离子体改性CS-HA-PAA和紫外固化改性CS-HA-PAA的吸水率分别可达1053.2g/g、869.44g/g,NaCl质量浓度为9g/L时最高吸盐水率分别为181.03g/g、151.49g/g,等离子体改性CS-HA-PAA的吸水、耐盐性能优于紫外固化法改性CS-HA-PAA。

Corn straw cellulose-humic acid-based water-absorbent resin(CS-HA-PAA)was modified by plasma and ultraviolet curing methods,respectively.The structure and morphology of the modified water-absorbent resin were characterized by Fourier transform infrared spectrometry(FT-IR)and scanning electron microscopy(SEM).The properties of the modified water-absorbent resin,such as salt resistance,acid and alkali resistance,water retention,and repetitive liquid absorption,were investigated.The results showed that the modified CS-HA-PAA had more hydrophilic groups,rough surface and pore structure,which was conducive to the improvement of the water absorption performance.The water absorption rates of the plasma-modified CS-HA-PAA and the ultraviolet-cured modified CS-HA-PAA prepared under the optimal process conditions were up to 1053.2g/g and 869.44g/g,respectively,and the highest salt water absorption rates were 181.03g/g and 151.49g/g,respectively,at the mass concentration of NaCl of 9g/L.The results indicated that the water absorption and salt resistance of the plasma-modified CS-HA-PAA were better than those of the ultraviolet-cured CS-HA-PAA.