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超细水镁石的硅烷偶联剂表面改性
作者:杜高翔 郑水林 李杨 
单位:中国矿业大学化学与环境工程学院 中国矿业大学化学与环境工程学院 北京工业大学 北京100083  北京100083  北京100024 
关键词:水镁石  氢氧化镁  表面改性  硅烷偶联剂  聚丙烯 
分类号:TQ314.24
出版年,卷(期):页码:2005,33(5):659-664
DOI:
摘要:
超细活性水镁石是一种重要的环保型阻燃材料。使用2种硅烷偶联剂对水镁石超细粉进行了表面改性试验。将改性后的水镁石粉添加到聚丙烯(polypropylene,PP)中,研究了硅烷改性对PP/水镁石复合材料性能的影响。通过对改性前后粉体的扫描电镜(scanningelec tronmicroscope,SEM),Fourier变换红外光谱以及PP/水镁石复合材料新鲜断面的SEM分析等手段,研究硅烷偶联剂对水镁石粉改性的效果和改性机理。结果表明:偶联剂硅烷A174和硅烷FR693的最佳用量分别为水镁石粉质量的1.5%和1.0%,改性温度为80℃。改性可以使PP/水镁石复合材料的悬臂梁缺口冲击强度提高0.3kJ/m2,弯曲模量提高30%以上,并使材料的阻燃性能提高。使用偶联剂硅烷FR693可以使复合材料的拉伸强度提高1MPa,2种偶联剂都不能提高断裂伸长率及弯曲强度。
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Surface-modified ultra-fine brucite powder is a kind of environment-friendly fire-retardant of polymer. The ultra-fine brucite powder was surface-treated with two kinds of silane(A174 and FR693), and then filled into polypropylene (PP) as a kind of fire-retardant aimed. The effect of modification by silane on the properties of PP/brucite composite material was studied. The effect and modification mechanism were investigated by means of Fourier transfer infrared analysis, scanning electron microscopy of brucite powder and the fresh new surface of PP/brucite. The results show that the optimal dosage of brucite powde for silane A174 and silane FR693 is 1.5% and 1.0% in mass respectively and the temperature of surface treatment is 80 ℃. It indicates that the surface modification can enhance the izod impact strength of PP/Mg(OH)_2 composite material by 0.3 kJ/m~2, the bend modulus about 30%, and the retardant degree is enhanced to V0 from V1. The tensile strength of the composite material surface modified with silane FR693 can be increased 1 MPa. The bending strength and elongation at break of the material are not improved by both silane.
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参考文献:
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