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为改善聚对苯二甲酸丁二醇酯(PBT)的激光标记效果,通过将二氧化锡(SnO_2)分散在PBT熔体中制备PBT/SnO_2材料,经激光辐照处理,在材料表面产生清晰的激光标记图案。通过肉眼观察和显微分析发现,与纯PBT相比,PBT/SnO_2材料在激光辐照后具有较高的标记对比度和边缘锐度,取决于SnO_2加入量和激光功率参数。此外,在不同激光功率条件下考察了PBT/SnO_2材料表面产生的二维码(QR)的标记质量和机器可读性。使用扫描电镜(SEM)、X射线衍射(XRD)、拉曼光谱、热重分析(TGA)和示差扫描量热仪(DSC)对激光标记表面进行表征分析。结果表明PBT/SnO_2材料表面激光标记的形成是由于SnO_2颗粒吸收1 064nm波长激光的辐射能量,使颗粒周围PBT分子链局部受热发生热解炭化,从而导致无定型黑色碳类物质的生成,过程中没有发生SnO_2晶型结构的变化。
In order to improve the laser marking effect of polybutylene terephthalate (PBT), PBT / SnO 2 was prepared by dispersing SnO 2 in PBT melt and laser irradiated to produce clear Laser Marking Pattern. Through visual observation and microscopic analysis, PBT / SnO 2 material has higher mark contrast and edge sharpness after laser irradiation than pure PBT, depending on the amount of SnO 2 added and laser power parameters. In addition, the labeling quality and machine readability of two-dimensional code (QR) generated on the surface of PBT / SnO 2 materials were investigated under different laser powers. The laser-labeled surfaces were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The results show that the formation of laser marking on the PBT / SnO 2 surface is due to the radiation energy of the laser at 1064 nm absorbed by the SnO 2 particles, which pyrolyzed and carbonized the PBT molecular chains around the particles, resulting in the formation of amorphous black carbon species. There was no change in the crystal structure of SnO 2.