增效反应中聚合氯化铝红外结构特征的变化

对聚合氯化铝 (PAC)进行增效改性是制备高性能无机高分子絮凝剂的重要手段之一。用多核络合剂络合、聚合硅酸交联和聚丙烯酰胺复合三种增效方法改性PAC ,分别获得了结构有别于PAC的新型絮凝剂CO PAC ,CR PAC和PAM PAC。其傅里叶红外光谱 (FTIR)表明 ,在三种无机高分子结构中均存在Al—OH以外的新化学键 ,且原有基团的特征吸收峰位置因受结构畸变而发生一定的低频红移 ,证实了PAC增效反应并不是单纯的物理混合加成作用 ,而是形成了具有特殊结构的无机高分子的化学反应。这类无机高分子絮凝剂所具有的优良絮凝特性是由增效剂和PAC间以化学作用为主的物理化学因素共同作用的结果。

Structural Characteristics of Infrared Spectra for Polyaluminum Chloride in Enhanced Reactions of Modification

As an important preparation method of Inorganic Polymer Flocculants (IPFs) with all-round performance, the use of enhanced reactions of modification for Polyaluminum Chlorides (PAC) is a trend of application. In this paper, auctorial-made multicore oligomers as a complexing agent, polysilicate as a crosslinking agent and polyacrylamide as a compounding agent are respectively used to enhance PAC and prepared three kinds of IPFs, named CO-PAC, CR-PAC and PAM-PAC. The Fourier Transform Infrared spectra (FTIR) of the three flocculants show that there have been found new chemical bonds beyond Al-OH in their structures, and each characteristic band of primary group in PAC has a band shift to a lower frequency dure to its structural aberration. These evidences suggested that enhanced reactions of modification for PAC are not at all a simple process of physical mix, but a chemical reaction to form other structural characteristics of inorganic polymers. The excellent coagulation behavior of these new flocculants depends mainly on the chemical actions, but there are a little physical effects between the modifiers and PAC.