It can be seen on the DTA curve that regardless of MCA fire retardant nylon 66/6 or fire retardant nylon 6, there is a sharp strong endothermic peak at about 350 ° C, which corresponds to the rapid thermal weight loss stage on the TG curve, that is, at 350 A chemical process of rapid decomposition and endotherm occurred in the weightlessness around ℃, but it was not found on the DTA curves of MCA and nylon.
In order to further explore this fire retardant mechanism, the authors performed IR thermal tracer analysis on nylon 6 and melamine cyanurate fire retardant nylon 6, and the results are shown in Figures 4-21 and 4-22. When MCA was subjected to thermal oxygen treatment in the air, it was found that MCA fire retardant nylon 6 was severely charred and expanded when heated in the temperature range of 350 ~ 400 ℃.
It can be seen from the figure that the thermal degradation behavior of pure nylon gradually increases with the increase of heat treatment temperature, and the characteristic peak of carbonyl group at 1740cm-1 after nylon degradation can be observed, and it increases with the increase of temperature. With the extension of heat treatment temperature and time, melamine cyanurate fire retardant nylon 6 can observe the characteristic peak of cyano group at 2246cm-1, which shows that the triazine ring of MCA is gradually thermally cracked and opened, which is in line with the above by Shirozaki Shimazaki of Toyama University in Japan. The results of melamine cyanurate alone thermal decomposition are in agreement.
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