硅丙乳液包覆Mg(OH)_2核壳结构纳米粒子的制备与表征  

Preparation and Characterization of Silicone-acrylate/Magnesium Hydroxide Core-shell Structured Hybrid Nanoparticles

作　　者：李延安 董海泉 徐丽娜 李蛟[1] LI Yan＇an DONG Haiquan XU Lina LI Jiao(School of Materials Science and Engineering, Shandong University of Technology, Zibo 25504)

机构地区：[1]山东理工大学材料科学与工程学院,淄博255049

出　　处：《材料导报》2017年第18期97-101,共5页Materials Reports

基　　金：山东省高等学校科技发展计划(J15LA08);山东理工大学青年教师发展支持计划(4072-114019)

摘　　要：为有效提高Mg(OH)_2纳米粒子在硅丙乳液中的相容性与分散稳定性,在油酸修饰Mg(OH)_2纳米粒子的基础上,以甲基丙烯酸甲酯、丙烯酸丁酯、丙烯酸与乙烯基三乙氧基硅烷为共聚单体,通过乳液聚合法制备出具有核壳结构的硅丙乳液包覆Mg(OH)_2复合材料。利用傅里叶变换红外光谱仪(FTIR)、X射线衍射仪(XRD)、透射电子显微镜(TEM)等测试手段对样品结构、形貌进行了表征。通过燃烧实验,研究了硅丙乳液包覆Mg(OH)_2纳米粒子对水性防火涂料阻燃性能的影响。结果表明,油酸通过酯化作用修饰在Mg(OH)_2纳米粒子表面,借助油酸分子中双键结构,丙烯酸类混合单体在纳米Mg(OH)_2表面完成聚合过程,形成以Mg(OH)_2纳米粒子为核、硅丙乳液为壳的复合材料。XRD与热分析表明经硅丙乳液包覆的纳米Mg(OH)_2晶体结构与热稳定性能未受影响。此外,掺杂0.1%(质量分数)的硅丙乳液包覆Mg(OH)_2可使水性防火涂料阻燃时间延长至113 min,较未掺杂水性涂料阻燃时间(91min)提高约23%。To effectively improve the compatibility and dispersion stability of magnesium hydroxide nanoparticles in the silicone-acrylate emulsion,core-shell silicone-acrylate/magnesium hydroxide（SA/MH）hybrid nanoparticles were prepared by means of grafting silicone-acrylate polymer,synthesis with butyl acrylate,methyl methacrylate,acrylic acid and vinyltriethoxysilane as comonomers,onto the surface of nanoparticles after oleic acid modification.The obtained nanocomposites were characterized by Fourier transform infrared spectroscopy（FTIR）,X-ray powder diffraction（XRD）,transmission electron microscopy（TEM）and thermogravimetric analysis（TGA）.The effect of SA/MH composites on the flame retardancy in waterborne flame-retardant coating was also investigated by combustion test.The results showed that the silicone-acrylate polymer could be successfully grafted on the surface of oleic acid-modified MH and the uniformly-dispersed core-shell structure of SA/MH composites with MH-cores and SA-shell was formed.XRD and TGA indicated that the crystal structure and thermal stability of nanocomposites were not destroyed.Moreover,the coating containing 0.1% SA/MH nanocomposites showed the better fire protection performance with the longer-lasting protection time（113 min）,23% higher than that of undoped coating sample（91 min）.

关 键 词：氢氧化镁 油酸 硅丙乳液 核壳结构 水性防火涂料 

分 类 号：O632.52[理学—高分子化学] TQ637.8[理学—化学]