Abstract: Aluminum hydroxide was modified with hydrogen silicone oil, and the influence of the loading of hydrogen silicone oil, time and temperature on the thermal stability and structure of aluminum hydroxide was characterized through thermogravimetry and Fourier transform infrared spectroscopy. The modified aluminum hydroxide was introduced polypropylene forming a composite, the mechanical properties and morphology of the fractured surface of which were studied. It was found the optical modification conditions were: the amount of modifier was 1.0 ％ of aluminum hydroxide, the modification time was 30 min, and the modification temperature was 80 ℃. The presence of hydrogen silicone oil not only improved the thermal stability of aluminum hydroxide, but also enhanced the mechanical properties of the composites.

Key words: aluminum hydroxide, hydrogen silicone oil, surface modification, mechanical property, flame retardancy, polypropylene