Abstract
AbstractWhen flame retardants are added to epoxy resins (EP) to enhance their flame retardancy, it often results in a negative impact on the mechanical properties of itself. In order to solve this problem, a new reactive flame retardant multi‐element hydrazides (BSD) is synthesized by using benzenesulfonohydrazide and diphenylphosphinic chloride as raw materials, it can play a flame retardant effect through the synergistic effect of P\N\S multi‐elements, and at the same time, a large number of secondary amine groups in the structure of BSD can produce strong hydrogen bonding interactions with the hydroxyl groups of the molecular chain of EP. The experimental results proved that the incorporation of only 3 wt% of BSD enabled EP to achieve a UL‐94 V‐0 rating. Furthermore, when the amount of BSD is increased to 5 wt%, the values for peak heat release rate (PHRR) and total heat release showed a reduction of 26% and 20.8%, ultimately maximizing the limiting oxygen index to 34.9%, showing exceptional efficiency. In the meantime, it showed a 37.3% increase in flexural strength and a 21.4% increase in tensile strength, and the transparency of the modified epoxy resin was still maintained at this time. In summary, introducing BSD into EP obtains a highly efficient reinforced flame retardant epoxy resin (FREP).Highlights A P/N/S‐containing hydrazide to improve the flame retardant of EP. When the P content is 0.25 wt%, the FREP reaches UL‐94 V‐0 grade. Tensile and flexural strength increased by up to 21.4% and 37.3%. With the addition of BSD, the FREP still show high transparency.
Published Version
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