Post press processes include various types of bonding and adhesives, depending upon the nature of adherends, the end use performance requirements and the adhesive bonding processes. Polyvinyl acetate (PVAc) adhesive is a widely used adhesive in the graphic industry for paper, board, leather and cloth. In this study, the enhancement of PVAc adhesion performance by adding different concentrations (1%, 2% and 3%) of silica (SiO₂) and titanium dioxide (TiO₂) nanoparticles was investigated. The morphology of investigated paper-adhesive samples was analyzed by SEM microscopy and FTIR spectroscopy. In addition, the optimal adhesion at the interface of paper and adhesive was found according to calculated adhesion parameters by contact angle measurements (work of adhesion, surface free energy of interphase, wetting coefficient). According to obtained surface free energy (SFE) results, optimum nanoparticles concentration was 1%. The wettability of the paper-adhesive surface and low SFE of interphase turned out as a key for a good adhesion performance. The end use T-peel resistance test of adhesive joints confirmed enhancement of adhesion performance. The highest strength improvement was achieved with 1% of SiO₂ nanoparticles in PVAc adhesive.

中文翻译：

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SiO2和TiO2纳米颗粒增强醋酸乙烯酯（PVAc）的粘合性能

压后过程包括各种类型的粘合和粘合剂，具体取决于被粘物的性质，最终使用性能要求和粘合剂粘合过程。聚醋酸乙烯酯（PVAc）粘合剂是图形工业中广泛用于纸张，木板，皮革和布料的粘合剂。在这项研究中，通过添加不同浓度（1％，2％和3％）的二氧化硅（SiO ₂）和二氧化钛（TiO ₂）来增强PVAc粘合性能）研究了纳米粒子。通过SEM显微镜和FTIR光谱分析所研究的纸胶样品的形态。另外，通过接触角测量（粘合功，相间表面自由能，润湿系数），根据计算出的粘合参数，找到纸和粘合剂界面处的最佳粘合力。根据获得的表面自由能（SFE）结果，最佳纳米粒子浓度为1％。纸粘合表面的润湿性和相间的SFE低是确保良好粘合性能的关键。最终使用的T型剥离粘合性测试证明粘合性能得到了增强。在PVAc粘合剂中使用1％的SiO ₂纳米颗粒可获得最高的强度提高。