A kind of preparation method of azide grafting modified nitrocellulose microspheres

Abstract

The invention discloses a preparation method of azide-grafted modified nitrocellulose microspheres. Under the action of mechanical stirring, NC-N 3 Disperse in deionized water, and raise the temperature at the same time, so that the system slowly forms a uniform liquid phase; when the temperature rises to 65 ° C ~ 70 ° C, slowly add solvent to the dispersed liquid phase system, and stir to form a viscous glue; Slowly add the pre-prepared aqueous solution of protective glue into the liquid, add sodium lauryl sulfate in batches after stirring, and continue stirring to form an "oil-water" type stable emulsion; slowly raise the temperature to 66 ° C ~ 72 ° C , carry out pre-distillation under reduced pressure until 30% of the total solvent is evaporated, add dehydrating agent in three batches, and continue to stir; then continue to heat up to 86 ° C ~ 88 ° C, until the solvent is completely evaporated, NC‑N can be obtained 3 The microspheres are then washed and dried to obtain the target product. The invention improves the physical compatibility between the components, reduces the phase separation probability between the phases, and improves the NC-N 3 Performance of microspheres in propellant powder applications.

Description

technical field [0001] The invention relates to a preparation method of nitrocellulose microspheres modified by azide grafting. It belongs to the technical field of new energetic materials. Background technique [0002] Nitrocellulose (NC) is an important component of gunpowder such as solid propellants. NCs that were not densified by solvent plasticization showed a loose, non-colloid-like fibrous state. If the loose fibrous NC is directly introduced into the propellant formula, the NC absorbs the plasticizer in the formula and plasticizes, and this process will proceed rapidly, which will cause the viscosity of the gunpowder slurry to rise sharply and agglomerate. The preparation process of propellant and other gunpowder grains cannot be completed; in addition, the direct use of loose NC to prepare grains will seriously affect the regulation of combustion law due to its poor compactness, thereby greatly reducing the combustion performance of gunpowder. In order to improv...

AI Technical Summary

Problems solved by technology

But now, most of the research and application of azide energetic polymers are directly added to the propellant formulation components, or introduced into the propellant components in other physical composite ways, so that there will be differences between the components. Unfavorable phenomena such as physical phase separation, a sharp increase in the viscosity of the slurry, and instability in the content control of the formulation components lead to poor physical compatibility between the components of the propellant formulation and poor process performance of the slurry.

Images