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

摘要:

以低分子量聚乙烯亚胺（PEI）为原料，用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)、1-氯辛烷对其进行疏水接枝改性，得到含硅疏水改性聚胺阻垢分散剂。通过红外光谱等一系列表征方法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 /d，沉降速率减小程度达到94.8%，分散性显著提高。经过改性后的聚乙烯亚胺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。

Abstract:

Low molecular weight polyethylenimine (PEI) was used as raw material, modified polyamines containing silica and hydrophobic were prepared by hydrophobic grafting of diglycidyl ether oxypropyl trimethoxy silane (KH560) 1-chlorooctane. The structure and properties of the modified polyamine scale inhibitor were analyzed by ir spectroscopy, the conclusions were drawn: the thermal stability, viscosity, surface tension and solution particle size of the modified products were improved. The modified polyamine scale inhibitor was used to disperse sodium aluminosilicate particles, the particles before and after treatment were characterized by infrared spectroscopy, 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. When the modified mass ratio was m(PEI(polyethylenimine MW=10000)):m(KH560(with -glycidyl ether oxypropyl trimethoxy silane)):m(1-chlorooctane)= 10:2:0.5, the reaction time was 6 h, and the reaction temperature was 75 ℃, the dispersion performance of the synthesized scale inhibitor was the best. When the mass concentration of scar is 30 g/L, the settlement rate of suspension particles reaches the lowest value of 0.047 /d, the settlement rate decreases to 94.8%, and the dispersion is significantly improved. The modified polyethylenimine has a highly effective effect of scale inhibition in the industrial production of alumina, which can be further replaced by the traditional strong acid scale inhibitor by optimizing the conditions in the factory, so as to reduce the degree of pipeline corrosion and reduce the energy consumption.