A new flame retardant system with organic modified boron nitride (m‐BN) and intumescent flame retardant (IFR) was used in this paper, and the synergistic flame retardancy of m‐BN and IFR on natural rubber (NR) was studied. NR/IFR/m‐BN composites were characterized by X‐ray photoelectron spectroscopy(XPS), Fourier transform infrared spectrometry (FTIR), thermogravimetric analysis, UL‐94, limiting oxygen index (LOI), tensile testing, cone calorimeter testing, and thermal conductivity testing. When 4 wt% m‐BN was added, the flame retardancy and mechanical properties of the composites were improved. The LOI value of NR/IFR/4 phr m‐BN reached 26.8%, and suppressed fire spread in a UL‐94 test. Compared with pure NR, the peak heat release rate (pHRR) was reduced by 52.2%, the total heat release (THR) was reduced by 27.6%, and CO yields were reduced by 51.4%. As a key aspect of fire safety, the ignition time is effectively delayed to 23 seconds due to the increased thermal conductivity of NR/IFR/m‐BN. Since the synergistic effect of m‐BN effectively improves the flame retardancy of NR, it provides a feasible method for improving the fire safety of polymers.

中文翻译：

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改性氮化硼作为阻燃天然橡胶的有效增效剂：制备与性能

本文使用一种新的有机改性氮化硼（m-BN）和膨胀型阻燃剂（IFR）的阻燃体系，研究了m-BN和IFR在天然橡胶（NR）上的协同阻燃性。NR / IFR / m-BN复合材料的特征在于X射线光电子能谱（XPS），傅立叶变换红外光谱（FTIR），热重分析，UL-94，极限氧指数（LOI），拉伸试验，锥形量热仪试验和导热系数测试。当添加4 wt％的m-BN时，复合材料的阻燃性和机械性能得到改善。NR / IFR / 4 phr m-BN的LOI值达到26.8％，并在UL-94测试中抑制了火势蔓延。与纯NR相比，峰值放热率（pHRR）降低了52.2％，总放热（THR）降低了27.6％，CO产率降低了51。4％。作为消防安全的关键方面，由于NR / IFR / m-BN的导热系数提高，点火时间有效地延迟到23秒。由于m-BN的协同作用有效地改善了NR的阻燃性，因此它为提高聚合物的防火性提供了一种可行的方法。