为提高热熔压敏胶在极端天气下的性能,通过引入动态二硫键和异氰酸酯键对苯乙烯-异戊二烯-苯乙烯嵌段共聚物(SIS)进行化学改性,合成了SIS接枝甲基丙烯酸羟乙酯-二硫代二丙酸(SIS-g-HD)和SIS接枝甲基丙烯酸羟乙酯-异佛尔酮二异氰酸酯(SIS-g-HI)。并将其按不同比例与环烷油、增粘树脂混合得到多种改性热熔压敏胶。通过拉曼光谱、红外光谱和热重对SIS改性前后进行材料表征,探究了单一改性和复合改性的性能差异。结果表明:改性后热熔压敏胶的软化点提高、黏度降低。SIS-g-HD更有利于流变性能的提升。由于高温性能不及SIS-g-HI改性,通过复掺SIS-g-HD和SIS-g-HI经协同作用可更好地改善热熔压敏胶的高低温性能。其中,以1∶1质量比复合改性可明显改善热熔压敏胶的高温和低温流变性能,同时粘接性能更优异。
To enhance the performance of hot-melt pressure-sensitive adhesives under extreme weather conditions,styrene-isoprene-styrene block copolymers (SIS) were chemically modified by introducing dynamic disulfide bonds and isocyanate groups,resulting in SIS grafted with hydroxyethyl methacrylate-dithiodipropionic acid (SIS-g-HD) and SIS grafted with hydroxyethyl methacrylate-isophorone diisocyanate (SIS-g-HI).These modified polymers were then blended with naphthenic oil and tackifying resins in different proportions to produce various modified hot-melt pressure-sensitive adhesives.Material characterization before and after SIS modification was conducted via Raman spectroscopy,infrared spectroscopy,and thermogravimetry to investigate performance differences between single and composite modifications.The results indicated that the modified hot-melt pressure-sensitive adhesives exhibited increased softening points and reduced viscosities.SIS-g-HD demonstrated greater potential for enhancing rheological properties.Due to its inferior high-temperature performance compared to SIS-g-HI modification,synergistic blending of SIS-g-HD and SIS-g-HI effectively improved the high- and low-temperature properties of the hot-melt adhesive.Specifically,composite modification at a 1∶1 mass ratio significantly enhanced both high- and low-temperature rheological performance while delivering superior adhesive properties.
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基金资助
新疆维吾尔自治区昌吉州两区科技发展计划项目(2023LQG03);新疆维吾尔自治区青年基金(2023D01C194)
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