Method for preparing high-energy explosive microcapsules by in-situ polymerization of melamine resin

A high-energy explosive, in-situ polymerization technology, used in explosives, non-explosive/non-thermal agent components, offensive equipment, etc., can solve the problem of high mechanical sensitivity of high-energy explosives, and achieve the effect of reducing sensitivity

Active Publication Date: 2016-07-06
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention overcomes the deficiencies of the prior art, and provides a melamine resin in-situ polymerized high-energy explosive microcapsule and its preparation method, which are used to solve the technical problem of high-energy explosive mechanical sensitivity

Method used

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  • Method for preparing high-energy explosive microcapsules by in-situ polymerization of melamine resin
  • Method for preparing high-energy explosive microcapsules by in-situ polymerization of melamine resin
  • Method for preparing high-energy explosive microcapsules by in-situ polymerization of melamine resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Weigh 10 g of melamine, 16 g of 40% formaldehyde solution, 24 g of deionized water, and 0.02 g of polyvinyl alcohol to form a mixed solution, and adjust the pH value of the solution to 8-9 with triethanolamine. Heating at 75° C. with a stirring speed of 400 rpm, when the mixture becomes transparent, start timing, and react for 40 minutes to obtain a prepolymer solution.

[0032] Step 2: Prepare 200g of 2wt% polyurethane Estane-5703 / 1,2-dichloroethane solution, add 20g of HMX, stir at room temperature for 30min, filter and dry the material to obtain surface-treated HMX explosive.

[0033] Step 3: Take 10g of the treated HMX explosive, add it to 20g of the prepolymer solution prepared in step 1, adjust the pH value of the emulsion to 3-4 with citric acid, control the reaction temperature to 60°C, and the stirring speed to 200rpm, and react for 3h , after filtering, washing and drying, the high-energy HMX explosive microcapsules can be obtained.

[0034] The effec...

Embodiment 2

[0036] Step 1: Weigh 10 g of melamine, 16 g of 40% formaldehyde solution, 24 g of deionized water, and 0.04 g of polyvinyl alcohol to form a mixed solution, and adjust the pH value of the solution to 8-9 with triethanolamine. Heating at 80° C. with a stirring speed of 400 rpm, when the mixture becomes transparent, start timing, and react for 60 minutes to obtain a prepolymer solution.

[0037] Step 2: Prepare 200 g of 1 wt % polyurethane Estane-5703 / 1,2-dichloroethane solution, add 20 g of RDX, stir at room temperature for 30 min, filter and dry the material to obtain surface-treated RDX explosive.

[0038] Step 3: Take 10g of the treated RDX explosive, add it to 30g of the prepolymer solution prepared in step 1, adjust the pH of the emulsion to 3-4 with dilute hydrochloric acid, control the reaction temperature to 70°C, and the stirring speed to 250rpm, and react for 3 hours , after filtering, washing and drying, high-energy RDX explosive microcapsules can be obtained.

[00...

Embodiment 3

[0041]Step 1: Weigh 8 g of melamine, 12 g of 40% formaldehyde solution, 24 g of deionized water, and 0.02 g of polyvinylpyrrolidone to prepare a mixed solution, and adjust the pH value of the solution to 8-9 with sodium hydroxide. Heating at 70° C. with a stirring speed of 450 rpm, when the mixture becomes transparent, start timing, and react for 100 minutes to obtain a prepolymer solution.

[0042] Step 2: Prepare 100g of polyurethane Estane-5703 / 1,2-dichloroethane solution with a concentration of 1.5wt%, add 10g of CL-20, stir at room temperature for 50min, filter and dry the material to obtain surface-treated CL -20 Dynamite.

[0043] Step 3: Take 5g of the treated CL-20 explosive, add it to 15g of the prepolymer solution prepared in step 1, adjust the pH value of the emulsion to 3-4 with citric acid, control the reaction temperature to 65°C, and the stirring speed to 400rpm, React for 1.5 hours, filter, wash and dry to obtain high-energy CL-20 explosive microcapsules.

...

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Abstract

The invention discloses a high-energy explosive microcapsule prepared through the in-situ polymerization of melamine resin and a preparation method of the high-energy explosive microcapsule. The high-energy explosive microcapsule is prepared by taking melamine resin as a wall material and taking high-energy explosives such as tetramethylene-tetranitramine (HMX), cyclotrimethylenetrinitramine (RDX), and 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazatetracyclo[5.5.0.0.0]dodecane(CL-20) as core materials through implementing an in-situ polymerization method. The preparation method comprises the following steps: firstly, preparing melamine and formaldehyde into a prepolymer solution; then, adding high-energy explosives subjected to surface modification; and finally, demulsifying a prepolymer under acidic conditions, and carrying out centrifugal separation, washing and drying on the obtained product, so that the high-energy explosive microcapsule can be obtained. The high-energy explosive microcapsule prepared by using the method disclosed by the invention is uniform in particle size, the surfaces of the particles are coated with compact melamine resin walls, and the coated content of the compact melamine resin wall is controllable. Due to the characteristics, the impact and friction sensitivity of the high-energy explosives can be significantly reduced, and a universal approach for the effective sensitivity reduction of explosives is provided.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a method for preparing high-energy explosive microcapsules by in-situ polymerization using melamine resin as a wall material. Background technique [0002] High-energy explosives such as cyclotetramethylenetetranitramine (HMX), cyclotrimethyltrinitramine (RDX), and hexanitrohexaazaisopentazane (CL-20), which have high energy density characteristics, can To achieve efficient damage, a large number of practical applications have been obtained in weapons. However, high-energy explosives have high impact sensitivity, friction sensitivity, and electrostatic spark sensitivity, and their safety performance is poor, which brings certain safety hazards during the preparation, transportation, and storage of weapon ammunition. Through surface coating technology, the desensitizing agent is coated on the surface of high-energy explosives to achieve high-eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C06B23/00C06B45/18
Inventor 杨志剑丁玲黄忠聂福德
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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