【作者】 张雪茜；

【导师】 刘敏江；

【作者基本信息】 天津科技大学 ， 材料加工工程， 2004， 硕士

【摘要】 近些年来，由于纳米科技的迅速发展，纳米复合材料的应用开发受到越来越多的瞩目。纳米塑料是其中的一种。它们的功能多样化，并且能够批量生产，我们可以根据需要充分利用它们的通用和特殊性能。所以，怎样合成、加工、成型、改性纳米复合材料是当今研究的热点。 基于这种考虑我们选用低密度聚乙烯作为基体树脂设计了一系列试验。众所周知，虽然它的耐光老化性差，但它仍然是应用广泛的热塑性塑料之一。如果我们在其中添加光稳定剂，会导致复合材料的力学性能下降，同时成本升高。寻找一种适宜的添加物，既能保证它的力学性能，又能提高它的光稳定性，已经成为当前研究的一个热点。 本文根据塑料填充改性的原理，运用低密度聚乙烯和钛酸酯改性纳米氧化锌作为主要原料，制成了纳米氧化锌／低密度聚乙烯复合材料，研究了分散剂的种类和用量，添加方法，不同的工艺路线对复合材料的拉伸性能，流动性能，耐光老化性能的影响。 实验结果表明：我们选用定量、定性的分散剂，将纳米氧化锌与其它适宜的物质制作成母粒，将它分散在低密度聚乙烯中，用双螺杆挤出机造粒，用Brabender挤出机挤出片材，能获得令人满意的效果。更多还原

【Abstract】 In recent years, more and more attentions are paid on the nanocomposites with the rapid development of the nano-technology. Nano-plastics are one of them. They are multifunctional and can be mass produced. We can make full use of their universal and special property according to the needs. So, how to synthety, formation , fabrication modify the nanocomposites has been the hot point.Based on this view, we select LDPE as the fundamental resin, design a series of experiments. As we all know, LDPE’s light-resistant quality is not very good, but it is also one of the most useful thermoplastics. Sometimes we have to add light stabilizer, but at the same time its mechanical property is deceased and costs is increased. So, how to seek some materials to guarantee its mechanical property and improve light fastness has been the hot point.We take phthalate ester modified nano-ZnO and LDPE as the basic materials, in accordance with plastic filling mechanism ,produce nano-ZnO/LDPE composite. We have studyed emulsifier’s type and worth, packing methods, different working course in order to find how they effect composite’s tensile quality, flow capacity, photo stability.The experimental results prove that we select definite quantity, qualitative dispering agent, make nano-ZnO and some other suitable materials into stem, then dispering stem into LDPE ,lastly we apply double screw mixer to make prill and Brabender mixer to squeez sheet, We can receive satisfied consequence.更多还原