PBT/SnO 2的激光标记性能及机理研究

摘要

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(SnO2)分散在 PBT 熔体中制备PBT/SnO2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/SnO2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 SnO2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/SnO2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/SnO2材料表面激光标记的形成是由于 SnO2颗粒吸收1064 nm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 SnO2晶型结构的变化。%High quality laser markings can be easily produced on surfaces of poly(butylene terephthalate) (PBT)by simple dispersing stannic oxide (SnO2 )in PBT melt,and followed by a laser irradiation proce-dure in order to improve the laser marking performance of PBT.Compared with the pure PBT sample,the PBT/SnO2 samples after the beam-controlled laser irradiation showed higher marking contrast and edge a-cuity,depending on the SnO2 loading content and laser power in terms of the visual observations and mi-croscope analysis.In addition,the marking quality and readability of the laser markings for the industrial use as the two-dimensional quick response (QR)codes were tested for the PBT/SnO2 material under vari-ous laser power condition.The laser irradiated material surfaces were characterized by using SEM,XRD, Raman spectroscopy,TGA and DSC.The results indicated that the formation of the black-colored marks on sample surfaces was due to the laser absorption at the irradiation wavelength of 1 064 nm by the SnO2 particles and localized heating of the surrounding PBT chains,leading to the generation of the amorphous black carbonized materials without changing the crystal structures of SnO2 .