Kuang Yongyan, Li Wenlong, Xie Shuli, Gong Weijian, Ye Zihan, Wang Yiming, Peng Dan, Li Jun
College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, China.
Ningbo Fotile Kitchen Ware Company, Ningbo 315336, China.
Polymers (Basel). 2023 Jun 16;15(12):2709. doi: 10.3390/polym15122709.
Vegetable-oils-based pressure-sensitive adhesives (PSAs) are being developed as a substitute for petrochemical-based PSAs for application in daily life. However, vegetable-oils-based PSAs face the problems of unsatisfactory binding strengths and easy aging. In this work, the grafting of antioxidants (tea polyphenol palmitates, caffeic acid, ferulic acid, gallic acid, butylated hydroxytoluene, tertiary butylhydroquinone, butylated hydroxyanisole, propyl gallate (PG), tea polyphenols) was introduced into an epoxidized soybean oils (ESO)/di-hydroxylated soybean oils (DSO)-based PSA system to improve the binding strengths and aging-resistant properties. PG was screened out as the most suitable antioxidant in the ESO/DSO-based PSA system. Under optimal conditions (ESO/DSO mass ratio of 9/3, 0.8% PG, 55% rosin ester (RE), 8% phosphoric acid (PA), 50 °C, and 5 min), the peel adhesion, tack, and shear adhesion of the PG-grafted ESO/DSO-based PSA increased to 1.718 N/cm, 4.62 N, and >99 h, respectively, in comparison with the control (0.879 N/cm, 3.59 N, and 13.88 h), while peel adhesion residue reduced to 12.16% in comparison with the control (484.07%). The thermal stability of the ESO/DSO-based PSA was enhanced after PG grafting. PG, RE, PA, and DSO were partially crosslinked in the PSA system, with the rest being free in the network structures. Thus, antioxidant grafting is a feasible method for improving the binding strengths and aging-resistant properties of vegetable-oils-based PSAs.
基于植物油的压敏胶粘剂（PSA）正在被开发用作石化基PSA的替代品，用于日常生活。然而，基于植物油的PSA面临粘结强度不理想和易老化的问题。在这项工作中，将抗氧化剂（茶多酚棕榈酸酯、咖啡酸、阿魏酸、没食子酸、丁基羟基甲苯、叔丁基对苯二酚、丁基羟基茴香醚、没食子酸丙酯（PG）、茶多酚）接枝引入到基于环氧化大豆油（ESO）/二羟基化大豆油（DSO）的PSA体系中，以提高粘结强度和抗老化性能。PG被筛选为基于ESO/DSO的PSA体系中最合适的抗氧化剂。在最佳条件下（ESO/DSO质量比为9/3、0.8% PG、55%松香酯（RE）、8%磷酸（PA）、50℃和5分钟），与对照（0.879 N/cm、3.59 N和13.88小时）相比，PG接枝的基于ESO/DSO的PSA的剥离粘附力、粘性和剪切粘附力分别增加到1.718 N/cm、4.62 N和>99小时，而剥离粘附残留率与对照（484.07%）相比降低到12.16%。PG接枝后，基于ESO/DSO的PSA的热稳定性得到增强。PG、RE、PA和DSO在PSA体系中部分交联，其余在网络结构中自由存在。因此，抗氧化剂接枝是提高基于植物油的PSA的粘结强度和抗老化性能的可行方法。
