The Investigation On The Synthesis And Process Of 2-Nitroimino-5-Nitro-Hexahydro-Hexahydro-1,3,5-Triazine (NNHT)

As a new insensitive monomer explosive, 2-Nitroimino-5-Nitro-Hexahydro -1,3,5-Triazine (NNHT) had been used for gun propellant with high explosive performanceby United States at present. The explosive capacity of M30Al has been improved upto 8% because of the NNHT. Insensitive explosive has been be deemed to safety andstable to against for external stimuli, store up and transportion. Accident caused bypeople or environmental stimulus will be reduced due to using insensitive explosive.Thus, The investigation on NNHT be of importance and practical significance.Among the preparation of NNHT, the intermediate product NIHT ? HCl has beenobtained. It can be synthesized by concentrated hydrochloric acid, naphthamine andnitroguanidine.The time and temperature of the reaction as well as the massconcentration of hydrochloric acid has been considered to investigated the yield ofNIHT ? HCI with the orthogonal method. The result shows that reaction time is thekey factor for composing the NIHT ? HCl, the reaction temperature makes mucheffect on this process and the concentration of hydrochloric acid has little influence.Thus, The optimal process of the reaction for obtaining NIHT ? HCl according themethod mentioned in our subject is at 38 for 7 hours with using analytical reagen℃thydrochloric acid as reactant. The yield is up to 71.3% and is the highest according tothe best crystallizing process.Reaction among certain time generation products mainly contain two kinds ofproducts, low melting point and high melting point product. Through the meltingpoint and infrared spectrometry, low melting point product is just what it need NIHT ?HCl, improving the experiment temperature, The high melting point products can betransformed into in hydrochloric acid low melting product. Thus it can improve yieldlow melting products.The intermediate products add to 98% thick nitric acid, when feeding in certainscope, maintain temperature after adds material, maintain a period of time, raising temperature in 2 ~ 3 , reactio℃n drawees NNHT after target product. For thesynthesis of target product for single factor and orthogonal test, the author examinesthe charging temperature, reaction time, nitric acid concentration three factors on theinfluence of target product yield. Through orthogonal test can be found feedingreaction temperature on the target product yield maximum impact, nitric acidconcentration, reaction time affect the minimum followed. Charging reactiontemperature in - 22℃or so, adopting 98% of nitric acid, reaction time, keeping 1hour can up to the highest rate of the target product. Highest rate is in 97.3% around.In synthesizing intermediate products NIHT ? HCI and target product NNHTprocess, the income product production yield were improved. Intermediate productyield increase by 65% of the document to 71.3%, the target product yield increase by63% of the document to 69.5%. The yield of product is 69.5% and its structure isconfirmed by FT-IR, NMR spectra.The performance of NNHT has been tested. The tcrystal structure, impactsensitivity or thermal analysis has been carried on. Moreover, the detonationperformance has been calculated by emprical formula.The density of NNHT is1.714 g/cm~3. The h50 cm for NNHT is 28.3 cm at 10kg drop hammer and 125.1 cm at2.5 kg drop hammer respectively. Its detonation velocity is 7750 m/s and detonationpressure is 26.2 GPa. The result show that NNHT is a high-energy insensitiveexplosives with excellent performance.