疏水硼酸锌与氢氧化镁协同阻燃EVA的性能研究

Study on Properties of Hydrophobic Zinc Borate and Magnesium Hydroxide Synergistically Flame-retarded EVA

使用硫酸锌、硼砂为原料,油酸为改性剂,采用一步法制备疏水硼酸锌(Zn2B6O11.3H2O)。用X射线衍射仪、傅里叶变换红外光谱仪、扫描电子显微镜、接触角测定仪等设备对样品的物相、形貌、疏水性进行了分析。结果表明,所制备的硼酸锌直径为1～2μm,片层厚度为0.1μm,接触角为105.1°;将硼酸锌与氢氧化镁[Mg(OH)2]复配用于乙烯-醋酸乙烯共聚物(EVA)阻燃时具有很好的协同阻燃作用,极限氧指数达到了38.5%;在EVA配方中加入疏水硼酸锌,复合材料的力学性能下降较慢,且优于加入相同量市售硼酸锌的复合材料。

Hydrophohic zinc borate （Zn2g6O11·3H2O） was prepared via a one-step wet synthesis from zinc sulfate and sodium borate, with oleic acid as the surfactant. The morphology and hydrophobic property of the products were analyzed by means of X-ray diffraction, Fourier transform infrated spectroscopy, contact angle analyzer, and scanning electron microscope. It indicated that the diameter and thickness of the products were 1-2μm and 0. 1 μm, respectively; the water contact angle was 105.1°. The prepared hydrophobic zinc borate was introduced into EVA/ Mg（OH）2 composites as a flame retardant. A synergetic effect was observed, the value of limited oxygen index reached 38. 5%, and the mechanical properties were only moderately decreased.