科研之友
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摘要
Double-shell co-microencapsulated ammonium polyphosphate and mesoporous MCM-41 (M(A&M)) were prepared by using melamine-formaldehyde resin and organic silicon in situ polymerization. The structure of the microcapsules was characterized by Fourier-transform infrared spectroscopy, particle size analysis, and scanning electron microscopy. In particular, the influence of basic properties of flame-retardant natural rubber , such as flame-retardant and mechanical property, was investigated with the limiting oxygen index, UL-94 test, thermogravimetric analysis, tensile test, and rubber process analyzer (RPA). Due to the presence of organic silicone shell, the NR/M(A&M) composites had much better flame-retardant and mechanical properties than other flame-retardant natural rubber (NR) composites. The limited oxygen index value of the NR/M(A&M) composite reached the maximum, and the UL-94 ratings were increased to V-0. Furthermore, M(A&M) showed better compatibility in NR system by the RPA. The occurrence of a synergistic effect between MCM-41 and intumescent flame-retardant in the NR composites was proved. As a result, the thermal stability and flame retardancy of NR were enhanced.
