水解对SL-g-P(AA-AM)/PVP半互穿高吸水树脂结构与性能的影响  

Effects of hydrolysis on structure and properties of SL-g-P(AA-AM)/PVP semi-interpenetrating superabsorbent resin

作　　者：张帆 徐桂明 朱丽珺[1] 姜姜 ZHANG Fan;XU Guiming;ZHU Lijun;JIANG Jiang(College of Science,Nanjing Forestry University,Nanjing 210037,Jiangsu,China;College of Forestry,Nanjing Forestry University,Nanjing 210037,Jiangsu,China)

机构地区：[1]南京林业大学理学院,江苏南京210037 [2]南京林业大学林学院,江苏南京210037

出　　处：《精细化工》2022年第9期1794-1804,共11页Fine Chemicals

基　　金：国家重点研发计划(2017YFC0505502)。

摘　　要：以木质素磺酸钠(SL)、丙烯酸(AA)、丙烯酰胺(AM)和聚乙烯吡咯烷酮(PVP)为原料,过硫酸钾为引发剂,N,N′-亚甲基双丙烯酰胺(MBA)为交联剂合成了SL-g-P(AA-AM)/PVP半互穿网络高吸水树脂。将SL-g-P(AA-AM)/PVP在NaOH水溶液中进一步水解得到H-SL-g-P(AA-AM)/PVP。考察了水解时间、Na OH溶液浓度、水解温度以及搅拌速率对树脂吸水倍率的影响。利用FTIR、LNMR、XRD、TG和SEM对水解前后样品的结构、热稳定性和表面形貌进行了表征,测试了水解前后样品的溶胀性能、保水性能及重复使用性能。结果表明,在NaOH浓度为0.0125 mol/L,水解温度为75℃,搅拌速率为400 r/min的条件下水解2.0 h得到的树脂吸水倍率可达2011.12 g/g,比未水解树脂提升了68.39%,且水解前后树脂的溶胀行为均符合一阶与二阶溶胀动力学模型。H-SL-g-P(AA-AM)/PVP在质量分数为1.1%的NaCl溶液中的吸盐水倍率(109.55 g/g)高于SL-g-P(AA-AM)/PVP(90.74 g/g),但由于水解后—COO^(–)增多,树脂在MgCl和FeCl溶液中的吸盐水倍率并未提升。此外,水解后树脂的保水性能优于未水解树脂,且具有一定的重复使用性能。A semi-interpenetrating network superabsorbent resin[SL-g-P(AA-AM)/PVP]was synthesized using sodium lignosulfonate(SL),acrylic acid(AA),acrylamide(AM)and polyvinylpyrrolidone(PVP)as raw materials,potassium persulfate as initiator and N,N’-methylene bisacrylamide(MBA)as cross-linking agent,which was further hydrolyzed in NaOH solution to obtain H-SL-g-P(AA-AM)/PVP.The effects of hydrolysis time,NaOH solution concentration,hydrolysis temperature and stirring rate on water absorption capacity of the resin prepared were then investigated.Meanwhile,the structure,thermal stability and surface morphology of samples before and after hydrolysis were characterized and analyzed by FTIR,LNMR,XRD,TG and SEM along with evaluation on the reusability,swelling and water retention properties.The results showed that the resin obtained by hydrolysis under the condition of Na OH concentration of 0.0125 mol/L,hydrolysis temperature of 75℃and stirring rate of 400 r/min for 2.0 h exhibited a water absorption capacity of 2011.12 g/g,68.39%higher than that of the unhydrolyzed resin.The swelling behavior of both resins before and after hydrolysis fitted to the first-and second-order swelling kinetic models.The swelling ability(109.55 g/g)of hydrolyzed sample in Na Cl solution with a mass fraction of 1.1%was higher than that of the unhydrolyzed control(90.74 g/g),while no significant swelling improvement was shown in Mg Cland FeClsolutions due to the increase of—COO^(-)after hydrolysis.Furthermore,the hydrolyzed resin also displayed better water retention performance than the unhydrolyzed resin,and exhibited certain reusability.

关 键 词：高吸水树脂 碱性水解 半互穿网络 木质素磺酸钠 功能材料 

分 类 号：TQ325.7[化学工程—合成树脂塑料工业]