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根据鸟粪层磷灰石的矿化机理,借鉴溶胶-凝胶法选用高化学活性物质的做法,开展了在常温常压条件下制备羟基磷灰石(HA)新方法的研究.结合鸟粪层磷灰石含硅的特点,引入少量的正硅酸乙酯,得到了一种新的抗风化表面保护材料.制备工艺以CaO的乙二醇溶液和P2O5的乙醇溶液为前驱体,反应过程常温常压条件下进行,无需调节pH值,操作简单,适合于大面积操作.在汉白玉石材表面使用后,场发射扫描电镜(SEM)、X射线能量色散谱仪(SEM-EDAX)等仪器分析表明所得含硅钙磷酸盐保护膜层与石材结合牢固、结构有序而致密.电导分析表明该保护薄膜能耐受pH=3～4的盐酸的侵蚀,耐酸性良好;对疏松岩石的仿制样品进行加固的结果表明,其抗压强度比空白仿制样品提高了8.5倍;亲水-憎水性检测结果表明,经表面保护的白玉石材与未保护前相比,对水的接触角基本保持不变.为开拓新的石质文物、建筑材料以及山石岩体的保护材料提供了思路.
According to the mineralization mechanism of guano apatite, the new method of preparing hydroxyapatite (HA) under the condition of normal temperature and pressure was studied based on the selection of highly chemically active sol-gel method. Apatite silicon-containing characteristics, the introduction of a small amount of tetraethyl orthosilicate, obtained a new anti-weathering surface protection material preparation process CaO ethylene glycol solution and P2O5 ethanol solution as a precursor, the reaction process Under the conditions of normal temperature and pressure, no need to adjust the pH value, the operation is simple and suitable for large-scale operation. After the surface of white marble stone is used, the field emission scanning electron microscope (SEM), X-ray energy dispersive spectroscopy (SEM- EDAX) The results show that the protective layer containing calcium silicate phosphate has a strong bond with the stone, the structure is orderly and compact, and the conductivity analysis shows that the protective film can withstand the corrosion of hydrochloric acid with pH = 3 ~ 4 and the acid resistance is good. The results of the reinforcement show that the compressive strength is 8.5 times higher than that of the blank imitation sample. The results of hydrophilicity and hydrophobicity show that the surface contact angle of white jade stone is almost unchanged compared with that of unprotected white jade stone To open up new ones Quality of cultural relics, construction materials and material protection rock rocks provides a guideline.