摘要
为了解决传统含磷阻垢剂对水体产生污染的问题,以马来酸酐(MA)、烯丙基磺酸钠(SAS)、甲基丙烯酸羟乙酯(HEMA)为合成单体,通过水溶液自由基聚合法制备了不含磷的MA-SAS-HEMA共聚物阻垢剂,并对其结构及热稳定性进行红外光谱、凝胶渗透色谱及热重分析表征。采用静态阻垢法探讨共聚物的阻垢性能,并利用X射线衍射仪(XRD)、扫描电镜(SEM)对投加MA-SAS-HEMA共聚物前后产生的碳酸钙、硫酸钙晶体进行分析,探究MA-SAS-HEMA共聚物阻垢机理。静态阻垢结果表明:低质量浓度MA-SAS-HEMA共聚物的阻垢效果良好,且对温度有较高的适应性,在高碱度、高硬度水中阻垢性能稳定。XRD与SEM结果表明:加入MA-SAS-HEMA共聚物后垢样结构明显疏松,阻垢效果良好;碳酸钙晶型发生改变,方解石特征峰显著降低,出现亚稳态球霰石和文石特征峰,硫酸钙晶型未发生改变但结晶度大幅度降低。MA-SAS-HEMA共聚物中羧酸基团对钙垢晶体具有晶格畸变和吸附分散作用,磺酸基和酯基与羧酸基团协同增效,进一步提高了阻垢性能。
In order to solve the problem of water pollution caused by traditional phosphorus-containing scale inhibitors,a phosphorus-free MA-SAS-HEMA copolymer scale inhibitor was prepared by aqueous solution free radical polymerization using maleic anhydride(MA),sodium allylsulfonate(SAS)and hydroxyethyl methacrylate(HEMA)as synthetic monomers.The microstructure of the copolymer and the thermal stability were characterized by infrared spectroscopy,gel permeation chromatography and thermogravimetric analysis.The scale inhibition performance of the copolymer was explored by static scale inhibition method.X-ray diffraction(XRD)and scanning electron microscopy(SEM)were used to analyze the calcium carbonate and calcium sulfate crystals produced before and after the addition of MA-SAS-HEMA copolymer to explore the scale inhibition mechanism of the copolymer.The results of static scale inhibition show that the copolymer can achieve good scale inhibition effect at low concentration,and are highly temperature resistant.The scale inhibition performance is stable in high alkalinity and high hardness water.The results of XRD and SEM showed that the scale structure was obviously loose and the scale inhibition effect was good after adding the copolymer.The crystal form of calcium carbonate changed,the characteristic peak of calcite decreased significantly,and the characteristic peaks of metastable vaterite and aragonite appeared.The crystal form of calcium sulfate did not change but the crystallinity was greatly reduced.The carboxylic acid group in the MA-SAS-HEMA copolymer.
作者
余嵘
段妍文
王媛
许杨
张弛
YU Rong;DUAN Yanwen;WANG Yuan;XU Yang;ZHANG Chi(School of Urban Planning and Municipal Engineering,Xi’an Polytechnic University,Xi’an 710048,China)
出处
《西安工程大学学报》
CAS
2023年第4期74-81,共8页
Journal of Xi’an Polytechnic University
基金
陕西省重点研发计划项目(2021NY-188)。
关键词
马来酸酐
共聚物阻垢剂
静态阻垢
碳酸钙
阻垢机理
maleic anhydride
copolymer scale inhibitor
static scale inhibition
calcium carbonate
scale inhibition mechanism
