【作者】 谢燕；

【导师】 刘玉鑫；

【作者基本信息】 四川大学 ， 应用化学， 2002， 硕士

【摘要】 本文以工业木质素磺酸盐LS为原料，H₂O₂-Fe（Ⅱ）为引发剂，采用自由基共聚反应对LS进行羧基接枝改性，制备得到改性磺化木质素LSA，并用红外光谱对其结构进行了表征。经测定，改性产物中羧基含量明显增大，接枝率达到11.6％。 通过静态阻垢法和鼓泡法测定LSA对碳酸钙垢、磷酸钙垢和锌垢的阻垢性能及其对氧化铁的分散性能。采用三因子二次回归正交试验设计阻垢实验，定量研究了LSA阻垢性能与溶液中阻垢剂LSA用量，Ca²⁺浓度和pH值之间的关系，得到的回归方程能较好拟合实验测定结果，可用于对LSA阻垢性能和确定其适用条件的研究。LSA与目前常用的几种阻垢分散剂作比较，证明改性产物LSA为一种阻垢分散性能较为理想的绿色阻垢剂。 通过阻垢实验和对碳酸钙晶体的电镜扫描表明：LSA对Ca²⁺、Fe³⁺、Zn²⁺等金属阳离子有较强的螯合能力及对结垢物质微粒具有分散作用，能影响垢的形成和粘附强度，使得垢层疏松、附着力差，并能使晶体产生晶格畸变作用，抑制晶体长大，造成结垢物质微粒结晶疏松，从而达到阻垢目的。更多还原

【Abstract】 This paper studied that industrial lignosulfonate LS was modified to graft carboxy by the free radical copolymerization reaction, which was initiated by H2C>2-Fe( II). The structure of modified lignosulfonate LSA was characterized by the infra-red spectrogram. Through measuring, the content of carboxy in LSA obviously improved and the grafting rate of LSA was 11.6%.LSA’s scale inhibition property for calcium carbonate, calcium phosphate and zinc scales and dispersing iron oxide were tested by the static scale inhibition test and the bubble test. Through the experiment of three-factor quadratic regression orthogonality, this paper studied quantitatively the relationship between the antiscale rate and the amount of LSA added, the calcium ion content of the solution and the pH value. The regression equation fairly fitted the result of the experiment and can be used for the study of the scale inhibition property and the applicable condition of LSA. Compared LSA’s scale inhibition and dispersion properties with some common scale inhibitors’, it showed that LSA was a kind of relatively desirable green scale inhibitor.Analysis of the result of scale inhibition test and electron microscope scanning calcium carbonate crystal showed: LSA has strong chelation action for metal ions such as Ca2\ Fe3\ Zn2* and etc. LSA has dispersion action for corpusclesof scale, and it can affect the formation and sticking intensity of scale, resulting in the loosing scale-layer and poor adhesion. LSA leads to crystal’s lattic distortion, which can inhibit crystals growing and make the particles of scale loosing to reach the desire of scale-inhibiting.更多还原