摘要
考察了几种典型有机处理剂对钛白粉热稳定性的影响。结果显示有机处理后钛白粉的热稳定顺序为聚硅氧烷>3-氨丙基三乙氧基硅烷>三羟甲基丙烷>辛基三乙氧基硅烷>三乙醇胺。通过热重及红外分析研究了有机处理剂分子结构对钛白粉热稳定性的影响机理,结果表明有机处理剂的分解温度、分解方式均对钛白粉热稳定性有重要影响。硅烷偶联剂在加热条件下可生成二氧化硅,在钛白粉表面形成一层包覆层,在一定程度上提高热稳定性,但偶联剂中长的碳链会降低热稳定性。有机胺在加热下N元素可掺杂到二氧化钛中,严重降低钛白粉热稳定性。聚硅氧烷由于骨架为键能较高的Si-O-Si,分解温度较高,热稳定性在几种常见的有机处理剂中最好,在350℃高温下仍具有较好的耐黄变性。
The influence of several kinds of typical organic treatment agents on the thermal stability of titanium dioxide was investigated.The results exhibited that the thermal stability followed the order:polysiloxane> 3-aminopropyltriethoxysilane>trimethylolpropane>octyltriethoxysilane>triethanolamine.The mechanism about the effect of molecular structure of organic treatment agents on the thermal stability of titanium dioxide was studied through thermal gravimetric(TG) analysis and Fourier transform infrared spectroscopy(FTIR) characterization.The results showed that both the decomposition temperature and decomposition mode exerted great influence on the thermal stability of titanium dioxide.Silane coupling agents could form silicon dioxide under heating condition,and formed a coating layer on the surface of titanium dioxide,which improved the thermal stability to a certain extent.But the long carbon chain in the coupling agent would reduce the thermal stability.Organic amine could be doped into titanium dioxide upon heating,which deteriorated the thermal stability of titanium dioxide.The decomposition temperature of polysiloxanes was high due to the Si-O-Si backbone with high bond energy,thus their thermal stability was the best among the common organic treatment agents.They still showed good yellowing resistance at 350 ℃.
作者
刘勇
侯腾飞
吴小平
Liu Yong;Hou Tengfei;Wu Xiaoping(Pangang Group Research Institute Co,Ltd.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,Sichuan,China)
出处
《钢铁钒钛》
CAS
北大核心
2018年第6期41-47,共7页
Iron Steel Vanadium Titanium
关键词
钛白粉
热稳定性
有机处理剂
影响机理
organic treatment agents
titanium dioxide
thermal stability
mechanism
