多孔硅酸钙在车用聚丙烯材料中的应用研究

发布时间：2018-04-30 09:18

  本文选题：多孔硅酸钙 + 填充改性　； 参考：《辽宁大学》2017年硕士论文

【摘要】：多孔硅酸钙是大唐国际采取预脱硅-碱石灰烧结法由粉煤灰制取得到的新型硅酸盐产品,本文研究其在改性聚丙烯中的应用,为粉煤灰的高附加值利用提供了一条有效途径,不仅解决环境问题,还会产生经济利益,具有重要的实际意义。文中采用了XRD、SEM、FT-IR、TG-DSC等方式对多孔硅酸钙的微观结构进行表征,探讨了机械加工对硅酸钙粒径分布、微观形貌、水分含量的影响,将表面活化多孔硅酸钙与滑石粉填充改性PP,对比研究了两者对聚丙烯/填料复合材料性能的影响,为多孔硅酸钙在改性聚丙烯方面提供技术支持,最后将多孔硅酸钙应用到了车用PP材料领域,研发出了符合某汽车公司内外饰材料标准的改性聚丙烯材料,通过一系列研究表明:(1)多孔硅酸钙中主要含有结晶程度较低或无定形态的托贝莫来石即水化硅酸钙,其化学简式为Ca O·Si O2·n H2O,除此之外含有少量的Si O2、Ca CO3、Ca(OH)2等,其表面孔隙结构丰富呈蜂窝状,比表面积为119 m2/g,平均孔径16.32nm。(2)多孔硅酸钙粉体粒径分布离散,平均粒径较大,不利于在改性PP中的应用,当磨粉机转速在40HZ加工条件下加工的粉体,粒径分布集中,D97为9.90μm,并且保持了原有的微观形貌。(3)多孔硅酸钙对聚丙烯热变形温度与力学性能的改善要优于滑石粉;活性多孔硅酸钙在20%填充时,使共聚聚丙烯热变形温度提高23.8℃,使拉伸强度提高9.7%,弯曲强度提高44.2%,弯曲模量提高83.7%,而且PP冲击强度基本保持不变;同等填充量下,加填多孔硅酸钙的PP密度要低于滑石粉。(4)将活化多孔硅酸钙、滑石粉、PP(L5E89)、PP(300H)、PP(K7726H)、HDPE(6084A)和POE(DF610)复合使用,通过实验筛选,研制出符合某汽车公司内外饰技术标准的改性PP,证实了多孔硅酸钙在车用改性塑料领域中应用的可行性。
[Abstract]:Porous calcium silicate is a new silicate product made from fly ash by pre-desilication and alkali lime sintering in Datang International. The application of porous calcium silicate in modified polypropylene is studied in this paper, which provides an effective way for the utilization of high added value of fly ash. Not only to solve environmental problems, but also to produce economic benefits, with important practical significance. The microstructure of porous calcium silicate was characterized by means of XRDX SEMT-IRG-DSC, and the effects of mechanical processing on the particle size distribution, morphology and moisture content of calcium silicate were discussed. The effects of surface activated porous calcium silicate and talc powder on the properties of polypropylene / filler composites were studied, which provided technical support for the modification of polypropylene by porous calcium silicate. Finally, the porous calcium silicate was applied to the field of automotive PP materials, and a modified polypropylene material which met the standards of internal and external decoration materials of a certain automobile company was developed. Through a series of studies, it is shown that the porous calcium silicate mainly contains low degree of crystallization or amorphous form of Tobiamurite, that is, calcium silicate hydrate, whose chemical formula is Ca O Si O 2 n H 2O, in addition, it contains a small amount of Sio 2, Ca CO 3, Cao 3 and CaO O H 2, and so on. Its surface pore structure is rich in honeycomb shape, with a specific surface area of 119m2 / g and an average pore diameter of 16.32nm.m-2). The particle size distribution of the porous calcium silicate powder is discrete and the average particle size is larger, which is not conducive to the application in the modified PP. The particle size distribution is 9.90 渭 m when the grinding machine rotate speed is processed under the condition of 40HZ, and the particle size distribution is 9.90 渭 m, and the original microstructure of the powder is maintained. The improvement of the thermal deformation temperature and mechanical properties of polypropylene by porous calcium silicate is better than that of talc powder. When the active porous calcium silicate is filled with 20%, the hot deformation temperature of copolymer polypropylene is increased by 23.8 鈩，

本文编号：1823975