This study reported the influence of oxidizer-fuel content and particle size of the fuel on combustion characteristics of the whistling mixture based on potassium perchlorate and sodium benzoate such as heat of explosion, the specific volume of gaseous products, burning rate and intensity of whistling sound. From the analysis of theoretical prediction and experimental data, we selected an appropriate ingredient and particle sizes of components in order to archive the optimal intensity of the whistle. The whistling pyrotechnic has a relatively low sensitivity to friction and could be safely used for several military and civilian applications.
In this work, the preparation of 2,4,6-trinitroresorcinol by the sulfonation-nitration method of resorcinol through three stages was investigated. The results showed that the 2,4,6-trinitroresorcinol synthesis efficiency reached the highest value (82-83%) when the molar ratio of HNO3/resorcinol was 3.45/1, the temperature of the nitrate stage was 30-70 ºC, and the concentration of HNO3 solution was 72%. Besides, the results of 2,4,6-trinitroresorcinol thermal analysis by TGA/DTA methods demonstrated that there are one melting point and two thermal decomposition points in the temperature range from 50 to 400 ºC.
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