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Loose spherical high polymer bonded explosive and preparation method thereof

A high-polymer, spherical technology, applied in the direction of explosives processing equipment, explosives, non-explosives/non-thermal agent components, etc., can solve the problem of poor specific surface area and fluidity of high-polymer bonded explosives, reduce press-fit performance and application effect and other problems, to achieve the effect of improving press-fitting performance and application effect, improving application effect and performance, and good quality stability

Pending Publication Date: 2022-08-02
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, the method for preparing composite explosives by spray drying is a two-step preparation method. First, the explosive emulsion is obtained by atomization, and the binder solution is added to the explosive emulsion for ultrasonic dispersion, followed by spray drying to obtain high polymer bonded explosives. The obtained high polymer bonded explosive has poor specific surface area and fluidity, which will reduce the technical problems of press-packing performance and application effect in the charging process

Method used

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  • Loose spherical high polymer bonded explosive and preparation method thereof
  • Loose spherical high polymer bonded explosive and preparation method thereof
  • Loose spherical high polymer bonded explosive and preparation method thereof

Examples

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preparation example Construction

[0026] The invention provides a preparation method of loose spherical polymer bonded explosive, comprising the following steps;

[0027] Mix 1,1-diamino-2,2-dinitroethylene (FOX-7), a binder and an organic solvent to obtain a solution, the binder includes TPU polyester and vinylidene fluoride and hexafluoropropylene copolymerization thing;

[0028] The solution is spray-dried to obtain the loose spherical polymer bonded explosive.

[0029] In the present invention, 1,1-diamino-2,2-dinitroethylene, a binder and an organic solvent are mixed to obtain a solution, and the binder includes TPU polyester (Estane 5703), vinylidene fluoride and hexafluoropropylene Copolymer (F 2602 ).

[0030] In the present invention, unless otherwise specified, the raw materials used are all commercially available products in the field.

[0031] In the present invention, the content of 1,1-diamino-2,2-dinitroethylene in the loose spherical polymer bonded explosive is preferably 94wt% to 96wt%, mo...

Embodiment 1

[0048] A kind of loose spherical FOX-7-based high polymer bonded explosive of the present embodiment (calculated by mass percentage) is composed as follows:

[0049] Main explosive: FOX-7, 94%; Binder system: TPU polyester, 4.8%; Vinylidene fluoride and hexafluoropropylene copolymer, 1.2%.

[0050] The concrete steps of this embodiment are:

[0051] (1) Weigh FOX-7 and dissolve it in N,N-dimethylformamide, wherein the mass ratio of FOX-7 and N,N-dimethylformamide is 2:98, weigh TPU polyester and partial The copolymer of vinylidene fluoride and hexafluoropropylene was dissolved in the N,N-dimethylformamide solution of FOX-7 to prepare Estane5703 and F with a mass fraction of 6% binder. 2602 A blended solution, wherein the mass ratio of FOX-7, TPU polyester and vinylidene fluoride to hexafluoropropylene copolymer is 94.0:4.8:1.2;

[0052] (2) Start the spray drying device, the inlet temperature is 90°C, and the nitrogen flow rate is 414L·h -1 , pass high-purity nitrogen for 2...

Embodiment 2

[0054] The difference from Example 1 is that the binder system in the composite structure polymer bonded explosive is implemented according to the following mass percentage composition: FOX-7, 95%; TPU polyester, 4%; vinylidene fluoride and hexafluoropropylene copolymer ,1%. For the preparation method of this example, refer to Example 1.

[0055] Products are observed with scanning electron microscope such as figure 2 shown.

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Abstract

The invention provides a loose spherical high polymer bonded explosive and a preparation method thereof, and belongs to the technical field of military energetic materials. FOX-7, an adhesive and an organic solvent are mixed to obtain a solution, and the adhesive comprises TPU polyester and a vinylidene fluoride and hexafluoropropylene copolymer; and carrying out spray drying on the solution to obtain the loose spherical high polymer bonded explosive. According to the invention, dissolved FOX-7 and a polymer binder polymer are co-precipitated through a spray drying coating technology, and the drying process of particles is driven by the pressure difference between vapor pressure and gas phase partial pressure of an organic solvent. The evaporation rate is balanced by the energy required for evaporating the organic solvent and the energy for transferring the solvent to the surface, so that loose and porous composite microspheres are formed, two heterogeneous components of the explosive and the adhesive are uniformly compounded, the free-running property and the specific surface area of the high polymer-bonded explosive are improved, and the application effect and the performance of the high polymer-bonded explosive in composite explosives are favorably improved.

Description

technical field [0001] The invention relates to the technical field of military energetic materials, in particular to a loose spherical polymer bonded explosive and a preparation method thereof. Background technique [0002] Polymer bonded explosives are high-energy mixed explosives with powdered explosives as the main component and other additives (such as binders, plasticizers or insensitive agents) added to optimize their performance and mechanical properties. As the filling material of ammunition combat system, polymer bonded explosive will inevitably be affected by harsh battlefield environment during long-term storage, transportation and use. Due to the uneven composition, low action strength and poor shape regularity of the composite particles prepared by the traditional water suspension method, the change of ambient temperature and humidity will significantly affect the interface adsorption between the energetic crystal and the binder, resulting in the generation of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B25/34C06B21/00C06B23/00
CPCC06B25/34C06B21/0066C06B23/001
Inventor 李小东杨玥孙彦涛王晶禹刘文杰赵悦
Owner ZHONGBEI UNIV
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