超细水镁石粉的表面改性及在聚烯烃中的应用

采用4种表面改性剂烷基多磷酸酯、硬脂酸钠、柠檬酸单甘酯、十二烷基磷酸酯对超细水镁石粉进行表面改性，通过吸水率、接触角等表征手段考察了改性剂种类和用量对超细水镁石粉表面改性的影响。2,2,4-三甲基戊烷洗涤后改性水镁石粉的接触角发生了变化，表明改性后的超细水镁石粉由亲水性转变为疏水性，吸附方式既有化学吸附又有物理吸附。将硬脂酸钠改性后的水镁石粉填充到聚烯烃中，结果表明，硬脂酸钠的较佳用量为2 %，硬脂酸钠改性水镁石粉的加入使聚烯烃的氧指数从29.3 %提高到32.9 %，断裂伸长率提高了30 %。

Surface Modification of Super-fine Brucite Powder and Its Application in Polyolefin

Super-fine brucite powder was surface modified using several surfactants as modifier, with the effect of modification characterized through water adsorption and contact angle measurements. After washed with 2,2,4-trimethylpentyl, the surface of brucite powder changed from hydrophilic to hydrophobic. Surface modified super-fine brucite powder was used in polyolefin flame retardant formulations. It was found sodium stearate was the best modifier in this study with an optimal dosage about 2 %, resulting in a limited oxygen index of 32.9 % and an elongation at break about 30 % higher than devoid sample.