纳米Al(OH)_3表面改性及其在EVA中的阻燃应用

Surface modification of nano-aluminium trihydrate(ATH) and its flame-retardant application with ethylene-vinyl acetate(EVA)

研究了硅烷偶联剂G湿法表面改性纳米Al（OH）3（ATH）及其在乙烯-乙酸乙烯酯共聚物（EVA）体系中的阻燃应用,确定了G的最佳质量分数1.5%和最佳改性pH值5～6.通过沉降试验、红外光谱及复合材料力学性能等对改性效果进行了表征：改性后粉体在液体石蜡中沉降速度明显降低,红外光谱图表明改性粉体表面有效键合了有机物质,拉伸测试表明添加改性粉体的复合材料力学性能明显提高.将改性纳米ATH应用于EVA阻燃,当无机填料质量分数为55%时,复合材料力学、阻燃性能即可达到性能要求.

Wet surface modification of nano-Al（OH）3 has been carried out with a silane coupling agent; the optimum results were obtained with a silane coupling agent dosage of 1.5% （by weight） and a pH of the Al（OH）3 slurry of 5--6. The modified composite particles have been studied by means of FTIR spectroscopy, settlement tests and mechanical testing. Settlement tests show that the sedimentation rate of the modified particles in liquid paraffin is markedly below that of the unmodified particles. IR spectroscopy confirms that the organic groups are chemically grafted to the Al（OH）3 surface. The mechanical properties of the composite with the modified ATH were significantly enhanced. When the modified ATH was used as a flame retardant with EVA, the mechanical properties and the flame retardant properties of the composite with 55% inorganic filler （mostly ATH） were shown to meet national standards.