An inexpensive intumescent flame retardant agent, melamine (MEL), was combined with diatomite (DM) and they were applied in preparation of flame retardant room-temperature-vulcanised silicone rubber (RTV) composites. The flame retardance, thermal stability, tensile performance and morphology of the composites were studied. The combination of DM and melamine (MEL) can significantly improve the flame-retardant and physico-mechanical properties of the RTV composites. Vertical burning test revealed that the RTV/DM/MEL composites exhibited self-extinguishment and better flame retardant properties. Cone calorimeter test showed that the PHRR value of RTV/DM-10/MEL-20 composite was 291 kW/m², which decreased at least 37.4% compared to pure RTV, 465 kW/m². In addition, this composite presented a high LOI value of 28.5%. The tensile strength and elongation at break of RTV/DM-10/MEL-5 was 0.18 MPa and 121.6%, which were improved about 63.6% and 93.6% compared with that of pure RTV, 0.11 MPa and 62.8%. The improvement of above properties was attributed to the excellent synergistic mechanism between DM and MEL. This study provided a development insight of polymer composites for flame retardant applications in the rubber industry.

将一种廉价的膨胀型阻燃剂三聚氰胺 (MEL) 与硅藻土 (DM) 结合，将它们用于制备阻燃室温硫化硅橡胶 (RTV) 复合材料。研究了复合材料的阻燃性、热稳定性、拉伸性能和形貌。DM和三聚氰胺（MEL）的结合可以显着提高RTV复合材料的阻燃和物理机械性能。垂直燃烧试验表明，RTV/DM/MEL 复合材料具有自熄性和更好的阻燃性能。锥形量热仪测试表明，RTV/DM-10/MEL-20复合材料的PHRR值为291 kW/m ²，比纯RTV 465 kW/m ²降低至少37.4%. 此外，该复合材料具有 28.5% 的高 LOI 值。RTV/DM-10/MEL-5的拉伸强度和断裂伸长率分别为0.18 MPa和121.6%，比纯RTV的0.11 MPa和62.8%提高了约63.6%和93.6%。上述性能的改善归因于 DM 和 MEL 之间优异的协同机制。该研究提供了聚合物复合材料在橡胶工业中阻燃应用的发展见解。