有机硅表面活性剂改性牡蛎贝壳粉填充尼龙6复合材料的制备

Preparation of Nylon 6 Composites Filled with Organic Silicon Surfactant Modified Oyster Shell Powder

采用氨基型有机硅表面活性剂对气流粉碎的牡蛎贝壳粉体进行表面改性,并与尼龙6熔融共混制备复合材料。通过激光粒度、表面元素分析、热失重分析、高压毛细管流变仪等分别研究了贝壳粉体的粒径分布、元素构成、热稳定性及相应复合材料的加工流变性和力学性能。实验结果表明,经气流粉碎和表面改性后的贝壳粉体具有粒子尺寸小(D50为5.1μm)、粒径分布窄(1~10μm)的特点。贝壳粉残留有机质和主体无机物热分解温度分别在300℃和600℃以上,表现出较好热稳定性。改性贝壳粉较未改性粉体具有更好的分散性及与树脂的界面结合,相应复合材料的熔体流动性和力学性能也明显优于后者。另外,贝壳粉因含有机质而具有一定极性,其尼龙树脂基复合材料较商品化碳酸钙填充尼龙的性能更佳。

The fine shell powder obtained through airstream pulverization was surface-treated with organic silicon surfactant,and then melt compounded with nylon 6 to prepare the composites. The particles size distribution,element constitution and thermal stability of the shell powder,as well as the processing rheological behavior and mechanical properties were investigated by laser particle analyzer,XPS,TGA and high-pressure capillary rheometer. The results show that the shell powder has narrow particle distribution(1 ~ 10 μm) with D50 average particle size of 5. 1 μm,and good thermal stability with 300 ℃ and 600 ℃ decomposing temperature for organic and inorganic components respectively. The modified shell powder shows better dispersion and interfacial combination. Accordingly,the corresponding processing rheological and mechanical properties of the modified system are higher than those of the latter. Additionally,as the residual organics can endow the shell powder with certain polarity,its nylon composites indicate better performances than commercial calcium carbonate filled nylon.