硅疏水改性聚胺阻垢剂的制备及其性能  

Preparation and properties of silicon hydrophobic modified polyamine scale inhibitor

作　　者：孙千惠 沈一丁[1,2] SUN Qianhui;SHEN Yiding(College of Chemistry and Chemical Engineering,Shaanxi University of Science&Technology,Xi'an 710021,Shaanxi,China;Key Laboratory of Auxiliary Chemistry&Technology for Chemical Industry,Ministry of Education,Shaanxi University of Science&Technology,Xi'an 710021,Shaanxi,China)

机构地区：[1]陕西科技大学化学与化工学院,陕西西安710021 [2]教育部轻化工助剂化学与技术重点实验室,陕西西安710021

出　　处：《精细化工》2020年第8期1636-1644,共9页Fine Chemicals

摘　　要：用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)、1-氯辛烷对低相对分子质量聚乙烯亚胺(PEI)进行疏水接枝改性,得到了含硅疏水改性聚胺阻垢剂。通过FTIR、TG、粒径分析、Zeta电位测试等分析改性后聚胺阻垢剂的结构与性能。结果表明,改性后产物热稳定性提高、黏度增大、表面张力降低、溶液粒径增大。将改性聚胺阻垢剂用于分散铝硅酸钠颗粒,对处理前后的颗粒进行红外光谱表征,并通过对悬浮分散液进行稳定性、颗粒沉降等测试,评价聚胺阻垢剂的阻垢分散性能并初步讨论其分散机理。当m(PEI,Mw=10000)∶m(KH560)∶m(1-氯辛烷)=10∶2∶0.5,反应时间6 h,反应温度75℃时,合成的阻垢剂分散性能最佳。当结疤的质量浓度为30 g/L时,悬浮液颗粒沉降速度达到最低值0.047 cm/d,沉降速率减小程度达到94.8%,分散性显著提高。经过改性后的PEI在氧化铝工业生产中具有高效的阻垢作用,可通过在工厂进行条件优化,进一步替代传统的强酸型阻垢剂,减小管道腐蚀程度,降低能耗。Silicon hydrophobic modified polyamine as a scale inhibitor was synthesized by grafting reaction from low molecular weight polyethylenimine(PEI)withγ-glycidyloxypropyltrimethoxysilane(KH560)and 1-chlorooctane.The structure and properties of the modified polyamine scale inhibitor were analyzed by FTIR.The results showed that the thermal stability,viscosity,surface tension and solution particle size of the product were improved after modification.The modified polyamine scale inhibitor was used to disperse sodium aluminosilicate particles,the particles before and after treatment were characterized by FTIR,and the dispersion performance of polyamine scale inhibitor was evaluated and its dispersion mechanism was preliminarily discussed by testing the stability and particle settling of the suspended dispersion solution.Under the conditions of m(PEI,Mw=10000)∶m(KH560)∶m(1-chlorooctane)=10∶2∶0.5,reaction time 6 h,and reaction temperature 75℃,the synthesized scale inhibitor displayed the best dispersion performance.When the mass concentration of scarring particles was 30 g/L,the particle setting velocity of suspension reached the lowest value of 0.047 cm/d,the decrease degree of particle setting velocity was 94.8%,and the dispersion performance significantly improved.The modified polyethylenimine has a highly effective scale inhibition effect in industrial production of alumina.It can further replace the traditional strong acid scale inhibitor by optimizing the conditions in the factory,so as to reduce the corrosion degree of the pipeline and reduce the energy consumption.

关 键 词：聚乙烯亚胺 疏水接枝 改性 铝硅酸钠 阻垢分散性能 机理 表面活性剂 

分 类 号：TQ085.4[化学工程] O633.21[理学—高分子化学]