目的 以化学键合法替代传统物理包覆法改性纳米氢氧化铝(Nano-ATH)阻燃剂,改善其在有机高聚物中的分散稳定性和相容性.方法 以钛酸酯偶联剂UP-311湿法表面改性Nano-ATH,运用正交实验的方法,研究改性剂用量、改性温度、改性时间对Nano-ATH粒径的影响,并通过红外光谱、粒度及Zeta电位等分析手段对最佳改性条件下制备的Nano-ATH的改性效果进行评价.结果 最佳改性条件为:改性剂用量3%(占Nano-ATH质量的百分比),改性温度75℃,改性时间30 min,钛酸酯偶联剂与Nano-ATH以化学键结合.结论 Nano-ATH的表面性能由亲水疏油变为亲油疏水,达到了对Nano-ATH阻燃剂改性修饰的目的.
The work aims to improve the dispersivity and compatibility of nano-sized aluminum trihydroxide (Nano-ATH) flame retardant modified in chemical grafting method instead of traditional physical adsorption method. Wet surface modifica-tion of Nano-ATH was carried out with titanate coupling agent UP-311. Effects of coupling agent usage, modification tempera-ture and modification time on particle size of Nano-ATH were studied in orthogonal experiment method. The modification ef-fect on Nano-ATH prepared under optimal modification conditions was evaluated by such analytical means as infrared spec-troscopy, particle size and Zeta potential, respectively. The optimal modification conditions were: m (modifier):m (Nano-ATH) as 0.03:1, modification temperature as 75℃, and modification time as 30 min. Nano-ATH could be bonded with titanate coupl-ing agent UP-311 by virtue of chemical bond. Surface property of the Nano-ATH powder is changed obviously after modifica-tion, the hydrophile-oleophobic Nano-ATH turns into lipophilic-hydrophobic Nano-ATH, and the purpose of surface modifica- tion is achieved.
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