【摘要】 聚对苯二甲酸乙二酯-1,4-环己烷二甲酯(PETG)回收薄膜因其表面残留的印刷油墨难以彻底去除，导致再生制品出现色泽不均、力学性能下降等关键问题，严重制约其高值化回收利用。为解决这一技术瓶颈，本研究旨在探究一种环保型油墨清洗剂对PETG薄膜的预处理效果，并系统评估清洗后薄膜的综合性能，为开发高效、绿色的PETG回收工艺提供理论依据和数据支持。选用一种新型环保配方清洗剂对带油墨污染的PETG薄膜进行预处理。采用电子万能试验机评估清洗前后薄膜的拉伸强度与断裂伸长率，以量化其力学性能变化；通过傅里叶变换红外光谱(FTIR)分析清洗过程对PETG分子结构的影响，确保其本体材料未受侵蚀。试验结果表明，经该环保清洗剂预处理后，力学性能测试显示，清洗后薄膜的机械方向(MD方向)力学性能呈现增强趋势。FTIR分析表明，清洗过程未引入新的官能团或导致PETG特征峰强度变化，证明该清洗剂对材料本体无化学降解作用。本研究成功验证了所采用的环保型油墨清洗剂在PETG回收预处理中的高效性与安全性。该清洗剂能有效去除油墨污染物，显著提升回收PETG薄膜的力学性能与外观品质，且不对其化学结构造成破坏。该工艺为PETG的绿色、高值化回收提供了一种可行的技术解决方案。更多还原

【Abstract】 Polyethylene terephthalate-1, 4-cyclohexanedimethyleneterephthalate(PETG) recycled films face critical issues such as uneven coloration and reduced mechanical performance due to residual printing inks on their surface that are difficult to remove completely, severely restricting their high-value recycling potential. To address this technical bottleneck, the pretreatment effects of an environmentally friendly ink remover on PETG films were investigated and the comprehensive properties of the films post-cleaning were systematically evaluated to provide theoretical and data support for the development of efficient and green PETG recycling processes. A novel environmentally friendly formulation of cleaning agent was selected for pretreating PETG films contaminated with ink. An universal testing machine was used to evaluate the tensile strength and elongation at break of the films before and after cleaning, quantifying changes in their mechanical properties. Fourier-transform infrared spectroscopy(FTIR) was employed to analyze the impact of the cleaning process on the molecular structure of PETG, ensuring the body material remained unaffected. The experimental results indicate that after pretreatment with this environmentally friendly cleaning agent, mechanical testing shows an enhancement trend in machine direction(MD direction) properties of the cleaned films. FTIR analysis reveals that during the cleaning process, no new functional groups are introduced into PETG or any changes occurr in the intensity of its characteristic peaks, thus proving that this cleaning agent has no chemical degradation effect on the material itself. This study successfully verifies the efficacy and safety of the environmentally friendly ink remover used in PETG recycling pretreatment. The cleaning agent effectively removes ink contaminants, significantly improves the mechanical performance and appearance quality of recycled PETG films and does not damage their chemical structure. This process provides a feasible technical solution for green, high-value recycling of PETG.更多还原