Moyano-Vallejo Alejandra, Carbonell-Blasco María Pilar, Hernández-Fernández Carlota, Arán-Aís Francisca, Romero-Sánchez María Dolores, Orgilés-Calpena Elena
INESCOP Footwear Technology Centre, Alemania 102, 03600 Elda, Alicante, Spain.
Polymers (Basel). 2024 Nov 29;16(23):3356. doi: 10.3390/polym16233356.
This study aimed to enhance the initial adhesion performance of reactive polyurethane hot-melt adhesives by using a bio-based polycarbonate polyol instead of traditional polyester or polyether polyols and by incorporating thermoplastic polyurethane (TPU) in varied proportions. Adhesives synthesized from bio-based polycarbonate polyols and polypropylene glycol with MDI as the isocyanate were characterized chemically, thermally, and mechanically (FTIR, DSC, plate-plate rheology, DMA, and T-peel strength test). Adding 10-15 wt.% TPU significantly improved green strength and initial adhesion at room temperature and after accelerated cooling. The bio-based polycarbonate polyol promotes superior flexibility at low temperatures compared to fossil-derived alternatives, aligning with sustainability objectives. The results showed that 10 wt.% TPU maximized green strength without compromising flexibility, whereas 15 wt.% TPU, though enhancing adhesion, reduced flexibility due to increased crystallinity. T-peel tests on footwear materials indicated that all the adhesives exceeded the EN 15307:2015 requirements, with the highest peel strength achieved after curing. These findings highlight the benefit of bio-based polycarbonate polyols and TPUs in achieving strong, flexible, and eco-friendly adhesives suitable for demanding applications.
本研究旨在通过使用生物基聚碳酸酯多元醇替代传统的聚酯或聚醚多元醇，并以不同比例加入热塑性聚氨酯（TPU），来提高反应型聚氨酯热熔胶的初始粘合性能。对由生物基聚碳酸酯多元醇和聚丙二醇与作为异氰酸酯的MDI合成的胶粘剂进行了化学、热学和力学表征（傅里叶变换红外光谱、差示扫描量热法、平板流变学、动态热机械分析和T型剥离强度测试）。添加10 - 15 wt.%的TPU显著提高了室温下以及加速冷却后的湿强度和初始粘合力。与化石衍生的替代品相比，生物基聚碳酸酯多元醇在低温下具有更好的柔韧性，符合可持续发展目标。结果表明，10 wt.%的TPU在不影响柔韧性的情况下使湿强度最大化，而15 wt.%的TPU虽然提高了粘合力，但由于结晶度增加而降低了柔韧性。对鞋类材料的T型剥离测试表明，所有胶粘剂均超过了EN 15307:2015的要求，固化后获得了最高的剥离强度。这些发现突出了生物基聚碳酸酯多元醇和TPU在实现适用于苛刻应用的强力、柔韧且环保型胶粘剂方面的优势。
