Talc‐containing polypropylene (PP) resin is extensively employed in automobiles. Herein, considering the microstructure transfer process in injection molding, the effect of the talc's dispersibility and particle size on this process and its impact on the gloss level of the product were investigated. Results show that a fine unevenness of about several micrometers was self‐formed by the shrinkage of PP in nontransferred areas due to the blending of talc. Additionally, the amount of self‐formed unevenness tended with an increase in the average particle size of talc. Furthermore, due to PP shrinkage and different densities of talc, it was observed that a fine tiger‐stripe pattern was self‐formed using special molds with modified microstructure. This self‐formed fine unevenness changes the gloss level owing to the diffused light reflection effect. This study proposes controlling this change by controlling the average particle size of talc and structure of the mold. POLYM. ENG. SCI., 60:132–139, 2020. © 2019 Society of Plastics Engineers

中文翻译：

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滑石粒度对聚丙烯注塑成型在汽车塑料表面粗糙度和光泽度的影响

含滑石粉的聚丙烯（PP）树脂广泛用于汽车中。在此，考虑到注射成型中的微观结构转移过程，研究了滑石的分散性和粒度对此过程的影响及其对产品光泽度的影响。结果表明，由于滑石粉的掺混，PP在未转移区域的收缩导致了约几微米的细微不均匀现象。此外，随着滑石粉平均粒径的增加，自形成的不均匀性也有增加的趋势。此外，由于PP的收缩和滑石的不同密度，可以观察到，使用具有改进的微观结构的特殊模具，可以形成精细的虎纹图案。由于扩散的光反射效应，这种自形成的细微不均匀性改变了光泽度。这项研究建议通过控制滑石粉的平均粒径和模具的结构来控制这种变化。POLYM。ENG。SCI。，60：132–139，2020.©2019塑料工程师协会