利用碳化法制备抗紫外线稀土白炭黑复合材料并对其性能加以研究.研究中发现,通过添加一定量的氯化铈与水玻璃自发形成共沉淀内核,继以碳化法形成二氧化硅包覆外壳,制备出一种高效抗紫外线改性白炭黑复合材料.由紫外吸收光谱检测可知,该改性白炭黑可以有效屏蔽200 nm～400 nm波长的紫外线;经过XPS对共沉淀内核测试,确定Ce氧化物为稳定氧化物CeO2,10 nm深度透射未发现Ce4特征峰,证明包覆完全.IR分析表明,特征峰发生了不同程度蓝移.扫描电镜对内核形貌观察,共沉淀形成内核为CeO2纳米颗粒镶嵌在SiO2骨架中,该结构可以发挥纳米稀土材料的小尺寸效应,而不受纳米粉体粒度过小引起团聚失效的限制,达到最佳抗紫外线性能.
This experiment mainly studies on the preparation and the performance of anti-ultraviolet rare earth white carbon black by carbonization.The study found that the efficient UV modified silica composite materials can be prepared in two steps.Firstly the co precipition core formed by adding cerium chloride to water glass,then coated silica shell formed by carbonization method.UV spectrum detection results showed that the modified white carbon black can effectively shield the 200 nm ～400 nm wavelength ultraviolet radiation.After co precipitation core test by XPS,it can be determined that the oxide about Ce is CeO2 in the core.And the characteristic peaks Ce4+ was not found in the coating of the particle by transmission with the depth of 10 nm,it appears that the kernel is coated completely.IR analysis showed that the characteristic peaks of the particles had blue shift in different degrees.With observation on the morphology of the kernel by scanning electron microscopic,it is found that CeO2 nano-particles are embedded in SiO2 matrix in the co precipitation kernel.This structure can play small size effect of nanometer material and avoid the decrease of anti-UV performance caused by nano-particle aggregation.
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