羟丙基甲基纤维素高吸水性树脂制备与性能表征
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摘要
以羟丙基甲基纤维素为骨架材料,丙烯酸为接枝共聚单体,过硫酸铵-亚硫酸氢钠为引发剂,聚乙二醇200二丙烯酸酯为交联剂,在微波辐射的条件下通过接枝聚合反应制备高吸水性树脂,并对高吸水性树脂的吸液倍率、吸液速率、保水性能以及红外光谱、热稳定性、表观形态进行表征。结果表明,羟丙基甲基纤维素与丙烯酸质量比为1/7、中和度为65%、引发剂与丙烯酸质量分数为1%、交联剂与丙烯酸质量分数为0. 4%、反应时间为4. 5 min是较优的制备方法,该条件下制备的羟丙基甲基纤维素高吸水性树脂吸水倍率可达497. 13 g/g,吸盐倍率为61. 70 g/g;35℃条件下,该高吸水性树脂可保水48 h以上;重复使用6次后,该高吸水性树脂仍具有较高的吸液倍率。
Super absorbent resin was prepared by graft copolymerization of hydroxypropyl methylcellulose( HPMC) with acrylic acid as graft copolymer,ammonium persulfate-sodium bisulfite as initiator and polyethylene glycol diacrylate as crosslinker under microwave radiation. The absorbent ratio,absorbent rate and crosslinking rate of super absorbent resin were studied. The water retention properties and IR spectra,thermogravimetric and apparent morphology were characterized. The results showed that the optimum preparation methods were as follows: the mass ratio of HPMC to acrylic acid was 1/7,the neutralization degree was 65%,the mass ratio of initiator to acrylic acid was 1%,the mass ratio of crosslinking agent to acrylic acid was 0. 4%,and the reaction time was 4 min and 30 s. Under the optimum preparation conditions,the water absorption ratio of HPMC super absorbent resin could reach497. 13 g/g and the salt absorption ratio was 61. 70 g/g. This hydroxypropyl methyl cellulose based super absorbent resin could absorb liquid to reach the state of preservation in 30 min quickly. The super absorbent resin could retain water for more than 48 h at 35℃,6 h at 55℃ and 5 h at 75℃. After six times of reuse,the water absorption rate of the super absorbent resin could still reach 69. 7% of the initial water absorption rate,and the salt absorption rate could still reach 44. 2% of the initial salt absorption rate. The super absorbent resin had good reusability. Thermogravimetric analysis showed that the super absorbent resin had good stability at 330℃. The hydroxypropyl methyl cellulose based super absorbent resin had good water absorption,salt resistance,high water retention rate and excellent reusability.
Super absorbent resin was prepared by graft copolymerization of hydroxypropyl methylcellulose( HPMC) with acrylic acid as graft copolymer,ammonium persulfate-sodium bisulfite as initiator and polyethylene glycol diacrylate as crosslinker under microwave radiation. The absorbent ratio,absorbent rate and crosslinking rate of super absorbent resin were studied. The water retention properties and IR spectra,thermogravimetric and apparent morphology were characterized. The results showed that the optimum preparation methods were as follows: the mass ratio of HPMC to acrylic acid was 1/7,the neutralization degree was 65%,the mass ratio of initiator to acrylic acid was 1%,the mass ratio of crosslinking agent to acrylic acid was 0. 4%,and the reaction time was 4 min and 30 s. Under the optimum preparation conditions,the water absorption ratio of HPMC super absorbent resin could reach497. 13 g/g and the salt absorption ratio was 61. 70 g/g. This hydroxypropyl methyl cellulose based super absorbent resin could absorb liquid to reach the state of preservation in 30 min quickly. The super absorbent resin could retain water for more than 48 h at 35℃,6 h at 55℃ and 5 h at 75℃. After six times of reuse,the water absorption rate of the super absorbent resin could still reach 69. 7% of the initial water absorption rate,and the salt absorption rate could still reach 44. 2% of the initial salt absorption rate. The super absorbent resin had good reusability. Thermogravimetric analysis showed that the super absorbent resin had good stability at 330℃. The hydroxypropyl methyl cellulose based super absorbent resin had good water absorption,salt resistance,high water retention rate and excellent reusability.
引文
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[2]李希,刘玉荣,郑袁明,等.保水剂性能及其农用安全性评价研究进展[J].环境科学,2014(1):394-400.LI Xi,LIU Yurong,ZHENG Yuanming,et al. Characterization and soil environmental safety assessment of super absorbentpolymers in agricultural application[J]. Environmental Science,2014(1):394-400.(in Chinese)
[3]杨永辉,武继承,毛永萍,等.利用计算机断层扫描技术研究土壤改良措施下土壤孔隙[J].农业工程学报,2013,29(23):99-108.YANG Yonghui,WU Jicheng,MAO Yongping,et al. Using computed tomography scanning to study soil pores under different soilstructure improvement measures[J]. Transactions of the CSAE,2013,29(23):99-108.(in Chinese)
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[8]谢修银,宛方,张艳,等.保水剂的研发现状与展望[J].化学与生物工程,2013,30(4):8-13.XIE Xiuyin,WAN Fang,ZHANG Yan,et al. Research and development situation and prospect of water retention agent[J].Chemistry and Bioengineering,2013,30(4):8-13.(in Chinese)
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[10]李晓璐,鲍艳,马建中.无机-有机纳米复合高吸水性树脂研究进展[J].化工新型材料,2016,44(2):43-45.LI Xiaolu,BAO Yan,MA Jianzhong. Research advances in inorganic-organic nanocoposite superabsorbent resin[J]. NewChemical Materials,2016,44(2):43-45.(in Chinese)
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[13]张铭,胡达,邓仕英,等.玉米淀粉接枝高吸水树脂的制备研究[J].科学技术与工程,2016,16(16):238-242.ZHANG Ming,HU Da,DENG Shiying,et al. Study on the preparation of corn starch grafted high water absorption resin[J].Science Technology and Engineering,2016,16(16):238-242.(in Chinese)
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[15]虞素飞.一种纤维素改性土壤保水剂的制备及性能研究[D].上海:东华大学,2013.YU Sufei. Preparation and performance of a soil aquasorb modified by cellulose[D]. Shanghai:Donghua University,2013.(inChinese)
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[18]晏凤梅,窦瑶,孙凯,等.改性羽毛蛋白接枝丙烯酸高吸水性树脂的制备及生物降解性能研究[J].广东化工,2011,38(9):13-14.YAN Fengmei,DOU Yao,SUN Kai,et al. Preparation and biodegradation of the modified feather protein grafted acrylic acidsuperabsorbent resin[J]. Guangdong Chemical Industry,2011,38(9):13-14.(in Chinese)
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