Abstract: 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 co-monomers, 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).
1 Munir T, Yasemin S. The properties of polymer composites filled with Mg(OH)2 powder[J]. J Polym Mater, 2012,29(2):189. 2 Ma H, Chen Z X, Mao Z P. Controlled growth of magnesium hydroxide crystals and its effect on the high-temperature properties of cotton/magnesium hydroxide composites[J]. Vacuum, 2013,95:1. 3 Sung G, Kim J W, Kim J H. Fabrication of polyurethane composite foams with magnesium hydroxide filler for improved sound absorption[J]. J Ind Eng Chem, 2016,44:99. 4 Wang Z Z, Qu B J, Fan W C, et al. Combustion characteristics of halogen-free flame-retarded polyethylene containing magnesium hydroxide and some synergists[J]. J Appl Polym Sci, 2001,81(1):206. 5 Song G L, Ma S D, Tang G Y, et al. Preparation and characterization of flame retardant form-stable phase change materials composed by EPDM, paraffin and nano magnesium hydroxide[J]. Energy, 2010,35:2179. 6 Lan S J, Li L J, Xu D F, et al. Surface modification of magnesium hydroxide using vinyltriethoxysilane by dry process [J]. Appl Surf Sci, 2016,382:56. 7 Zhang F Z, Zhang H, Su Z X. Surface treatment of magnesium hydroxide to improve its dispersion in organic phase by the ultrasonic technique[J]. Appl Surf Sci, 2007,253(18):7393. 8 Zhang W, Hu Z S, Zhang Y A, et al. Gel-spun fibers from magnesium hydroxide nanoparticles and UHMWPE nanocomposite: The physical and flammability properties[J]. Composites Part B, 2013,51:276. 9 Guo X J, Zhao L H, Zhang L, et al. Surface modification of magnesium aluminum hydroxide nanoparticles with poly(methyl methacrylate) via one-pot in situ polymerization[J]. Appl Surf Sci, 2012,258(7):2404. 10王娟, 李志伟, 李小红, 等. 聚苯乙烯表面包覆氢氧化镁纳米微粒的制备[C] //中国化学会第27届学术年会第04分会场摘要集. 开封, 2010:279. 11Li C Y. Preparation and performance studies of water-based extra-thin fire-retardant coating for steel structure[D]. Guangzhou: South China University of Technology, 2011(in Chinese). 李崇裔. 水性超薄型钢结构防火涂料的制备与性能研究[D]. 广州: 华南理工大学, 2011. 12Yan H, Zhang X H, Wei L Q, et al. Hydrophobic magnesium hydroxide nanoparticles via oleic acid and poly(methyl methacrylate)-grafting surface modification[J]. Powder Technol, 2009,193(2):125. 13Zhang X J. Study on synthesis and application of the waterborne silicone-acrylic emulsion[D]. Guangzhou: South China University of Technology, 2012(in Chinese). 张杏娟. 水性硅丙乳液的合成及应用研究[D]. 广州: 华南理工大学, 2012. 14Yang Z. Preparation and performance research on alkylsilan modified polycrylate emulsion with high alkylsilane content[D]. Jiangmen: Wuyi University, 2012(in Chinese). 杨震. 高硅含量硅丙乳液的制备与性能研究[D]. 江门: 五邑大学, 2012. 15Sierra-fernandez A, Gomez-villalbal S, Milosevio O, et al. Synthesis and morpho-structural characterization of nanostructured magnesium hydroxide obtained by a hydrothermal method[J]. Ceram Int, 2014,40:12285. 16Tan W Q, Li F. Study on the use of nano-aluminum hydroxide in intumescent fire-retardant coatings for steel structure [J]. China Coa-tings, 2008,23(3):30(in Chinese). 覃文清,李风. 纳米氢氧化铝在膨胀型钢结构防火涂料中的应用研究[J].中国涂料, 2008,23(3):30.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2017, Vol. 31 
