Study on Synthesis and Performance of Methyl Diphenyl Urea Stabilizer

Abstract

Abstract Diphenylamine (DPA), formyl chloride, and sodium hydride (NaH) as raw materials synthesize methyldiphenylurea stabilizer by alkylation reaction. The physical and chemical properties of methyldiphenylurea were characterized by nuclear magnetic resonance hydrogen spectrum (1HNMR), X-ray energy spectrum (EDS), Fourier transforms infrared spectroscopy (FT-IR) and differential thermal analysis (DTA). Thermal Decomposition Experiment of Nitrate Propellant Containing Stabilizer by Thermogravimetric Analysis (TGA), exploring the Effect of Different Stabilizers. The molecular surface electrostatic potential energy of methyl diphenyl urea, triphenylamine ( TPA ), dimethyl diphenyl urea (C2), and glycerol trinitrate were calculated by Materials Studio software. The interaction between the stabilizer and glycerol trinitrate molecule was studied. The results showed that the weight loss rate of methyl diphenyl urea was less than 0.1 % within 30 days, and the chemical stability was good. And its negative electrostatic potential energy is larger than that of C2 and TPA, its intermolecular binding ability with glycerol trinitrate is stronger, and its inhibition of nitrate decomposition stability is the best.