Fiber-reinforced rubber materials find extensive applications in tire manufacturing, hoses, conveyor belts, and various industrial sectors. Polyimide (PI) fibers offer superior fatigue resistance, tensile strength, modulus, and high-temperature durability compared to aramid fibers, positioning them as ideal substitutes in the belt layers of aircraft tire. To enhance the interfacial adhesion between polyimide fibers and rubber while minimizing the use of toxic and environmentally harmful materials, a novel eco-friendly carbon-reducing dipping system was devised. This system employs blocked diisocyanate and epoxy resin to activate PI fibers, and then uses a dipping solution, primarily composed of a blend of styrene–butadiene–vinylpyridine (VP) latex, lignin, tannic acid (TA), and glyoxal, to dip the fibers. This approach connects PI fibers and the rubber matrix through chemical bonds, thereby effectively enhancing the interfacial adhesion between the fibers and the rubber. The H pull-out force of the PI fiber cords treated by this system reached 179.6 N, with an average 180° peeling force of 14.7 N, and dynamic fatigue resistance exceeding 67,000 cycles, comparable to those achieved with the resorcinol-formaldehyde-latex (RFL) dipping system. These results indicate the efficacy of the developed system as a potential replacement for the RFL system. This research presents a sustainable and environmentally friendly approach to enhancing the interfacial adhesion of fiber-reinforced rubber composites, thereby contributing to the advancement of innovative high-performance fibers and biobased dipping system.

中文翻译：

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木质素生物基环保型聚酰亚胺纤维浸渍体系及其与橡胶的界面粘合机理


纤维增强橡胶材料在轮胎制造、软管、输送带和各种工业领域有着广泛的应用。与芳纶纤维相比，聚酰亚胺（PI）纤维具有优异的耐疲劳性、拉伸强度、模量和高温耐久性，使其成为飞机轮胎带束层的理想替代品。为了增强聚酰亚胺纤维和橡胶之间的界面粘合力，同时最大限度地减少有毒和对环境有害的材料的使用，设计了一种新型环保减碳浸渍系统。该系统采用封端二异氰酸酯和环氧树脂来活化PI纤维，然后使用主要由苯乙烯-丁二烯-乙烯基吡啶（VP）乳胶、木质素、单宁酸（TA）和乙二醛的混合物组成的浸渍溶液来浸渍PI纤维。纤维。该方法通过化学键将PI纤维与橡胶基体连接起来，从而有效增强纤维与橡胶之间的界面粘合力。经该系统处理的PI纤维帘线的H拉拔力达到179.6 N，平均180°剥离力为14.7 N，动态疲劳强度超过67,000次循环，与间苯二酚-甲醛-乳胶的结果相当（ RFL) 浸渍系统。这些结果表明所开发的系统作为 RFL 系统的潜在替代品的有效性。这项研究提出了一种可持续且环保的方法来增强纤维增强橡胶复合材料的界面粘合力，从而有助于创新高性能纤维和生物基浸渍系统的进步。