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在室温条件下,通过偏高岭石与磷酸水溶液中低聚[PO4]3nn-四面体基团的缩合,制备了脱水铝硅酸盐磷酸基矿物键合材料,该反应产物具有三维Si—O—Al—O—P结构。采用X射线衍射分析(X-ray diffraction,XRD)、Fourier红外吸收光谱2、9Si和27Al魔角旋转核磁共振(nuclear magnetic resonance,NMR)对反应产物进行了结构和反应机理分析。结果表明:反应产物中的Al3+具有3种化学环境特征。29SiNMR的化学位移只在-110处出现,预示着[SiO4]四面体以层状结构方式存在。反应产物的红外光谱中偏高岭石的表征Al—O层结构特征的800 cm-1共振吸收峰消失。反应产物的XRD谱具有非晶结构特征。据此,对键合反应机理模型进行了推测。
At room temperature, a dehydrated alumino-silicate phosphate-based mineral bonded material was prepared by the condensation of meta-kaolinite with an oligomeric [PO4] 3nn-tetrahedral group in an aqueous solution of phosphoric acid, the reaction product having a three-dimensional Si- -Al-O-P structure. The structure and reaction mechanism of the reaction products were analyzed by X-ray diffraction (XRD), Fourier infrared absorption spectroscopy (2,9Si) and 27Al magic angle nuclear magnetic resonance (NMR). The results show that Al3 + in the reaction product has three kinds of chemical environment characteristics. 29SiNMR chemical shifts occur only at -110, indicating that the [SiO4] tetrahedra exists as a layered structure. IR spectra of the reaction product metakaolinite characterization Al-O layer structure characteristics of the 800 cm-1 resonance absorption disappears. The XRD spectrum of the reaction product has amorphous structure. Accordingly, the bonding reaction mechanism model was speculated.