耐高温阴离子交换树脂的制备及性能  

Preparation and properties of high temperature resistant anion exchange resin

作　　者：姬定西 李俊菀[1] 胡振华[1] 杨裕民 付刚 JI Dingxi;LI Junwan;HU Zhenhua;Yang Yumin;Fu Gang(Xi'an Thermal Power Research Institute Co.,Ltd.,Xi'an 710054,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054

出　　处：《电力科技与环保》2022年第5期393-399,431,共8页Electric Power Technology and Environmental Protection

基　　金：中国华能集团有限公司科技项目(HNKJ21-HF172)。

摘　　要：在高温环境下,燃煤机组凝结水精处理系统中阴离子交换树脂的性能会发生衰减,为了提高树脂的热稳定性和结构强度,采用悬浮聚合法,以自制含纳米SiO_(2)的氯甲基化苯乙烯-乙烯基苯-二乙烯基苯聚合物(CSC)为原料,与游离胍进行胍基化反应,合成了一种强碱交换容量为4.05 mmol/g的胍基阴离子交换树脂(SBR)。采用红外(FTIR)、元素分析和形貌测试对合成的SBR树脂进行了结构表征,分别考察了n (游离胍):n (CSC)的摩尔比、溶剂的选择、反应温度和反应时间对SBR树脂合成的影响。通过对照实验,比较了商业化的D201树脂与SBR树脂的热稳定性和结构强度。FTIR、元素分析和形貌测试结果表明合成了能够保持完好树脂形态和粒度的SBR树脂。SBR树脂最优的合成工艺参数为:控制n (游离胍):n (CSC)的摩尔比为4:1,以N,N-二甲基甲酰胺(DMF)为溶剂,反应温度为80℃、反应时间为12 h。树脂性能检测包括热稳定性和结构强度两方面。热稳定性对比结果表明,SBR树脂在95℃去离子水中保持100 h强碱交换容量的下降率仅为7.28%,优于D201树脂的下降率14.46%,SBR树脂功能基团的分解温度要比D201树脂分解温度高约90℃。结构强度对比结果表明,SBR树脂在18.0 MPa保持100 h渗磨圆球率的下降率仅为3.13%,为D201树脂下降率的35.85%。综合来看,SBR树脂较D201树脂具有更好的热稳定性和结构强度,在火力发电空冷机机组凝结水精处理方面有着潜在的应用前景。In high temperature environment, the performance of anion exchange resin in the fine treatment system of coal-fired units will decline. In order to improve the thermal stability and structural strength of the resin, a guanidine anion exchange resin(SBR) with strong alkali exchange capacity of 4.05 mmol/g was synthesized by suspension polymerization with self-made chloromethylated styrene vinyl benzene divinylbenzene polymer(CSC) containing nano SiO_(2), as raw material and guanidine. The structure of SBR resin was characterized by FTIR, elemental analysis and morphology test. The effects of molar ratio of n(free guanidine):n(CSC), solvent selection, reaction temperature and reaction time on the synthesis of SBR resin were investigated. Through comparative experiments, the thermal stability and structural strength of commercial D201 resin and SBR resin were compared. FTIR, elemental analysis and morphology test results show that SBR resin with intact resin morphology and particle size was synthesized. The optimum synthesis parameters of SBR resin were as follows. The molar ratio of n(free guanidine):n(CSC) was 4:1, DMF was used as solvent, the reaction temperature was 80℃ and the reaction time was 12 h. The resin performance test includes two aspects: thermal stability and structural strength. The thermal stability comparison results show that the decrease rate of strong alkali exchange capacity of SBR resin maintained in deionized water at 95℃ for 100 h was only 7. 28%, which was better than that of D201 resin by 14.46%. The decomposition temperature of functional groups of SBR resin was about 90℃ higher than that of D201 resin. The structural strength comparison results show that the decrease rate of ball penetration rate of SBR resin maintained at 18.0 MPa for 100 hours was only 3.13%, which was about 35.85% of that of D201 resin. Overall,SBR resin has better thermal stability and structural strength than D201 resin, and has potential application prospects in condensate polishing of direct air cooler unit

关 键 词：纳米SiO_(2) 阴离子交换树脂 热稳定性 结构强度 胍基 

分 类 号：TQ425.21[化学工程] TM621[电气工程—电力系统及自动化]