分别采用乙烯基三乙氧基硅烷(VTES)、乙基三乙氧基硅烷(ETES)以及3-(氨基丙基)三乙氧基硅烷(APTES)对氢氧化镁(MH)进行表面改性,研究了改性工艺对改性MH粒子表面特性的影响。结果表明,确定的最佳改性条件为:改性剂为VTES、改性剂质量分数为8%、反应温度为80℃、搅拌转速为500 r/min、反应时间为2.0 h。将改性MH共混入硅橡胶,当 VTES-MH质量分数为50%时,与未添加MH的硅橡胶相比,VTES-MH/硅橡胶复合材料的拉伸强度和断裂伸长率仅分别降低了5%和11%,具有良好的力学性能;极限氧指数为40.2%,具有优良的阻燃性能。

The surface of magnesium hydroxide (MH) is modified by using vinyltriethoxysilane (VTES),ethyltriethoxysilane (ETES),and (3-aminopropyl)triethoxysilane (APTES),respectively.The influence of the modification process on the surface properties of the modified MH particles is investigated.The optimal modification conditions are determined through the experimental study as follows:VTES is used as the modifier with a mass fraction of 8%,the reaction temperature is 80℃,the stirring speed is 500 r·min^-1,and the reaction has performed for 2.0 hours.The modified MH is blended into silicone rubber.Compared to silicone rubber without MH,the tensile strength and elongation at break of the silicone rubber containing 50% of VTES-MH decrease by 5% and 11%,respectively.The VTES-MH/silicone rubber composite material with such a composition exhibits good mechanical properties,delivers a limiting oxygen index of 40.2% and shows excellent flame retardant performance.

马树刚(1987-),男,博士,高级工程师,研究方向为无机阻燃剂开发,mashugang@petrochina.com.cn;侯经纬(1974-),男,博士,高级工程师,研究方向为流程模拟和工艺包开发,通讯联系人,houjingwei@petrochina.com.cn。