PREPARATION OF INDUSTRIAL MINERAL COMPOSITE POWDERS ANDTHE APPLICATION IN PP COMPOSITES
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摘要: 通过化学方法成功地实现了矿物粉体在Ca (OH)2-H2O-CO2 体系中的表面纳米化修饰, 即在微米级重质碳酸钙、硅灰石粉体表面形核生成粒径均匀的纳米碳酸钙颗粒层。研究表明, 表面纳米化修饰后的矿物粉体表面的粗糙度大大增加, 尖锐的棱角得以钝化, 纳米化修饰后矿物粉体比表面积比原来提高至少200 %以上。将经表面纳米化修饰后的硅灰石粉体在聚丙烯(PP) 中填充应用, 较未经表面纳米化修饰的硅灰石粉体填料, 其抗冲击强度提高65 %以上, 延伸率提高200 %以上。Abstract: e mineral composite particles with rough surfaces and blunt edge angles , coated by nanometer calcium carbonate with a particle size range of 20~100 nm , were successfully prepared by a chemical method in Ca (OH)2-H2O-CO2 system. The specific surface area of the composite powders increased twice or above after coating. It is exhibited thatpolypropylene (PP) composites filled by the composite powders with nano-structure surface have better properties becausethe nano-structured mineral powders have bigger surface areas which would lead to more interfacial compatibility betweenpowders and polymer matrix when the powders are filled into the polymer and moreover , the blunt edge angles would reduce the stress concentration at angles , compared with un-coated powders as filler.
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Keywords:
- mineral powder /
- nano-structure surface /
- surface modification /
- application
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期刊类型引用(5)
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