Abstract As flammable natural rubber (NR) becomes more ubiquitous in industrial fields, there is a growing need for safe and effective flame retardant treatments through efficient techniques. Remarkably, our developed highly efficient natural tannic acid (TA)-based intumescent flame-retardant system (AGT) has the unique function in the rubber flame retardant aspect. Meanwhile, the developed coating method through polyurethane elastomer (PU) both as adhesive medium and a carbonforming agent can not only minimize the influence of flame retardant on the desirable intrinsic properties of base polymer and also maximize the efficiency of flame retardant. The flame-retardant coating (AGT/PU) exhibits highly efficient flame retardant performances reflected by a 31.9% reduction in peak heat release rate and a 27.3% reduction in total heat release and a 26.2% reduction in total smoke production with 50 wt% loading in 1 mm thick coating due to synergistic flame retardant effects. More importantly, the excellent flame retardancy performance are obtained by the PU@AGT10, as reflected in flame retardancy index (FRI) value of 11.88 makes it as excellent flame retardancy performance. While many physically mixed flame retardants are usually seriously detrimental to mechanical properties of NR, the influence of AGT/PU coating on mechanical properties of NR decreases obviously because fire retardant just directly impacts on PU adhesive layer rather than NR matrix, and the reinforcement function of graphene is also much significant. Moreover, the coating method requires just less flame retardant to achieve high flame retardant effect for NR. These findings suggest that significant opportunities for flame retardant polymer materials in industry.

中文翻译：

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一种为天然橡胶制造膨胀型阻燃和抑烟保护涂层的简便策略

摘要 随着可燃天然橡胶 (NR) 在工业领域变得越来越普遍，对通过高效技术进行安全有效的阻燃处理的需求日益增长。值得注意的是，我们开发的高效天然单宁酸（TA）基膨胀型阻燃体系（AGT）在橡胶阻燃方面具有独特的功能。同时，通过聚氨酯弹性体（PU）作为粘合剂介质和碳形成剂开发的涂层方法不仅可以最大限度地减少阻燃剂对基础聚合物所需固有性能的影响，还可以最大限度地提高阻燃剂的效率。阻燃涂层 (AGT/PU) 表现出高效的阻燃性能，表现为峰值放热率降低 31.9%，总放热率降低 27.3%，26. 由于协同阻燃作用，在 1 毫米厚的涂层中加入 50 重量％的烟气，总烟雾产生量减少 2％。更重要的是，PU@AGT10获得了优异的阻燃性能，阻燃指数（FRI）值为11.88，使其具有优异的阻燃性能。虽然许多物理混合阻燃剂通常对NR的力学性能有严重的不利影响，但AGT/PU涂层对NR力学性能的影响明显降低，因为阻燃剂只是直接影响PU胶层而不是NR基体，其增强功能石墨烯也很重要。此外，涂层方法只需要较少的阻燃剂即可实现 NR 的高阻燃效果。