异质包覆氧化铁黄颜料的结构表征及耐热性  

Structural characterization and heat resistance of heterogeneous coated iron oxide yellow pigments

作　　者：徐敏虹 郭玉华 潘国祥 王玲玲 XU Min-hong;GUO Yu-hua;PAN Guo-xiang;WANG Ling-ling(Department of Materials Engineering,Huzhou University,Huzhou,313000,China)

机构地区：[1]湖州师范学院材料工程系,浙江湖州313000

出　　处：《化学研究与应用》2021年第12期2427-2432,共6页Chemical Research and Application

基　　金：浙江省自然科学基金(LQ19E040001)资助;浙江省领军型创新创业团队项目(2018R01008)资助。

摘　　要：以乙酸乙酯作为潜伏性酸促进硅酸钠水解,湿法包覆磷酸钙/氧化铁黄颜料(FeOOH/Ca),在氧化铁黄颜料表面形成异质包覆层,以提高FeOOH/Ca的耐热性能。采用透射电子显微镜(TEM)、X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)分别对包覆前后样品的表面形貌、晶相组成、元素化学态进行了表征分析。结果表明:硅酸钠水解产物SiO_(2)能有效包覆FeOOH/Ca,且没有改变其晶体结构,FeOOH/Ca和其表面无定型的SiO_(2)包覆层通过化学键结合。在250℃烘烤30 min后,包覆FeOOH/Ca的色差ΔE为0.96,耐热性达到250℃。Ethyl acetate was used as latent acid to promote the hydrolysis of sodium silicate, and wet coating of calcium phosphate/iron oxide yellow pigments(FeOOH/Ca).After that heterogeneous coating layers were formed on the surface of FeOOH/Ca to improve the heat resistance.The surface morphology, crystal phase composition, chemical states of elements of FeOOH/Ca before and after coating were characterized by transmission electron microscopy(TEM),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS).The results show that FeOOH/Ca is effectively coated with SiO_(2),which is the hydrolysis product of sodium silicate, and the crystal structure of FeOOH/Ca is not changed.The FeOOH/Ca and amorphous SiO_(2)are bonded by chemical bonds.After baking at 250 ℃ for 30 min, the color difference ΔE of coated FeOOH/Ca is 0.96,and the heat resistance reaches 250 ℃.

关 键 词：氧化铁黄颜料 包覆 硅酸钠 耐热性 

分 类 号：TQ620[化学工程—精细化工]