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首页> 外文学位 >Etude des defauts de surface generes lors du moulage de mousses de thermoplastiques elastomeres.
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Etude des defauts de surface generes lors du moulage de mousses de thermoplastiques elastomeres.

机译：研究弹性体热塑性泡沫塑料成型过程中产生的表面缺陷。

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Thermoplastic polyolefins are merely a blend of a thermoplastic material, polypropylene for example, and an elastomer. They are used in exterior automotive applications, such as bumper fascias, for their impact resistance at low temperature and their ability to be injected molded and extruded. However in order to diminish the fossil oil consumption and to save money in the production of such parts, the objective of his research is to use the foaming technology to reduce the mass of injected molded parts of TPO by 20% without sacrificing the required class-A surface quality. Benefits of reduced vehicle weight can have an important environmental impact since there is a 6-8% improvement in fuel efficiency for every 10% in weight reduction.; Firstly, to answer to this issue, we did a systematic study on the effect of the injection parameters on the weight reduction of the foamed parts and their surface quality. Concerning the foaming morphology that we probed, the cell density was between 104 and 106 cells/cm3 and the number average cell diameter was between 50 and 200 mum. It was found that the best strategy is to decrease the shot size, to diminish the mass of the TPO parts, and to decrease the cycling time and the temperature of the injected melt, to raise the surface quality. However, the targeted objectives were not achieved in these preliminary experiments, therefore a blend of TPO containing from 1 to 10 wt% of maleic anhydride modified polypropylene (PP-g-MA) is used in order to promote TPO foamability and improve its surface quality. Finally under these conditions, we managed to produce injected molded TPO samples with a 24% in weight reduction and a good surface quality. Moreover, in this work, we investigate the effect of PP-g-MA in the TPO system by performing rheological measurements and photoacoustic Fourier transform infrared (PA-FTIR) analysis to characterize the PP-g-MA physico-chemical interactions with TPO.
机译：热塑性聚烯烃仅仅是热塑性材料，例如聚丙烯和弹性体的混合物。它们用于外部汽车应用，例如保险杠装饰板，因为它们在低温下具有抗冲击性，并且具有注塑成型和挤出成型的能力。但是，为了减少化石油的消耗并节省此类零件的生产成本，他的研究目标是使用发泡技术将TPO注塑零件的质量降低20％，而不会牺牲所需的等级-表面质量。减轻车辆重量的好处可能对环境产生重要影响，因为每减少10％的重量，燃油效率就会提高6-8％。首先，为了回答这个问题，我们对注射参数对发泡部件的重量减轻及其表面质量的影响进行了系统的研究。关于我们探究的泡沫形态，泡孔密度在104和106个泡孔/ cm3之间，数均泡孔直径在50和200微米之间。已发现最好的策略是减小注射量，减小TPO零件的质量，并减少循环时间和注入的熔体温度，以提高表面质量。然而，在这些初步实验中未达到目标目的，因此使用了含有1至10 wt％的马来酸酐改性聚丙烯（PP-g-MA）的TPO混合物，以提高TPO的发泡性并改善其表面质量。 。最终，在这些条件下，我们设法生产出注塑成型的TPO样品，其重量减轻了24％，并且表面质量良好。此外，在这项工作中，我们通过进行流变测量和光声傅里叶变换红外（PA-FTIR）分析来表征PP-g-MA与TPO的物理化学相互作用，从而研究PP-g-MA在TPO系统中的作用。

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