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包覆型Fe2O3/SiO2复合颜料的制备及其性能
作者:陈缘1 杜高翔1 高华2 翁传欣1 
单位:1.中国地质大学北京材料科学与工程学院 北京 100083  2.中国地质大学北京数理学院 北京 100083 
关键词:铁红 二氧化硅 包膜 耐酸性 色度值 
分类号:TQ622.1+5;TD985
出版年,卷(期):页码:2014,42(3):0384-0389
DOI:10.7521/j.issn.0454-5648.2014.03.20
摘要:

采用溶胶­­凝胶法制备了均匀分散于醇/水体系中的Fe2O3/SiO2微纳米复合粒子。通过色差分析、扫描电子显微镜、红外光谱分析、酸溶率测试等研究了反应温度、催化剂浓度、硅/铁质量比等工艺因素对包膜效果和色度的影响。结果表明,得到的最优工艺条件是:反应温度为30,催化剂氨水的浓度为0.75mol/L,硅铁质量比为0.2651,反应时间为6h。在最优工艺条件下,可以得到SiO2膜均匀致密包覆的氧化铁红颗粒,其色度值均得到提升;Fe2O3/SiO2复合粒子置于稀盐酸56h后,Fe3+析出量仅为0.08%。并分析了包覆过程中静电作用和化学键作用机理,证实包覆形态的决定性作用。

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The micro-sized/nano-sized particles of Fe2O3/SiO2 composite evenly in alcohol/water system were prepared by a sol-gel method. The effects of parameters (i.e., reaction temperature, catalyst concentration and silica/hematite (SiO2/Fe2O3) mass ratio) on the surface modification and chromaticity of the Fe2O3/SiO2 composite particles were investigated by chromatic difference analysis, scanning electron microscopy, infrared spectroscopy and acid resistance test, respectively. The results show that the optimal conditions are reaction temperature of 30℃, catalyst concentration of ammonia solution of 0.75mol/L, silica/hematite ratio of 0.265∶1 and reaction time of 6h. Under the optimal condition, hematite particles can be coated with homogeneous and compact silica, and the chromaticity values of the coated composite particles can be improved. The quantity of dissolved Fe3+ is 0.08% after Fe2O3/SiO2 composite particles are in diluted hydrochloric acid for 56h. In addition, the electrostatic effect and the chemical bonding mechanism of the coating process were also analyzed.
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基金项目:
中央高校基本科研业务费专项资金(2652013037) 资助。
作者简介:
第一作者:陈 缘(1988—),女,硕士研究生。 通信作者:杜高翔(1976—),男,博士,副教授。 ———————————— Received date:2013-06-26.  Revised date: 2013-10-15. First author: CHEN Yuan(1988-), female, Mastercandidate E-mail: cyxx1uxiang@sina.com Corresponding author: DU Gaoxiang (1976-), male, Ph.D., Associate Professor. E-mail: dgx@cugb.edu.cn
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