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adn/alh 3 Composite microsphere, preparation method and solid propellant comprising same

A technology of composite microspheres and curing agents, which is applied in the direction of offensive equipment, explosives processing equipment, explosives, etc., can solve the problems of non-dense surface coating, decreased hydrogen content, and failure to meet the safety performance of propellants, achieving low mechanical sensitivity, The effect of tight structure and controllable microsphere structure

Active Publication Date: 2022-04-12
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can increase AlH to a certain extent 3 The stability and safety of the propellant, but it usually leads to problems such as the decrease of the hydrogen content and the non-dense surface coating, which cannot meet the requirements for the safety performance of the propellant during the development process.

Method used

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  • adn/alh <sub>3</sub> Composite microsphere, preparation method and solid propellant comprising same
  • adn/alh <sub>3</sub> Composite microsphere, preparation method and solid propellant comprising same
  • adn/alh <sub>3</sub> Composite microsphere, preparation method and solid propellant comprising same

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preparation example Construction

[0057] Ammonium dinitramide / aluminum trihydride (ADN / AlH) of the present invention 3 ) The preparation method of composite microspheres is to combine precipitation by in situ self-assembly method, comprising the following steps:

[0058] (1) After dissolving ADN in the solvent, add the precursor of the first reactive protective layer and stir evenly for later use. The first reactive protective layer includes a prepolymer, a curing agent, and a catalyst, and the stirring time is 20 to 30 minutes , the rotation speed is 400-800rpm, the prepolymer is one of hydroxyl-terminated glycidyl ether (GAP), hydroxyl-terminated polybutadiene (HTPB) or hydroxyl-terminated perfluoropolyether (PFPE), and the curing agent is Isophor One or a combination of ketone diisocyanate (IPDI), toluene diisocyanate (TDI) or polyfunctional aliphatic isocyanate (N-100), the catalyst is di-n-butyltin dilaurate.

[0059] (2) AlH 3 Put it into a beaker, add anti-solvent, and ultrasonically pulverize it in a...

Embodiment 1

[0088] Dissolve 5gADN and 0.2g of HTPB glue+TDI curing agent+organotin catalyst completely in 20mL acetonitrile; 5gAlH 3 Put it into a beaker, add 100ml of anti-solvent dichloromethane, under the double action of stirring and ultrasonic, keep AlH 3 In a suspension state, the ultrasonic power is 700W, and the stirring speed is 1000rpm; the ADN solution is added dropwise at a rate of 0.2ml / min to a concentration of 5gAlH 3 Keep the temperature at 40°C, the ultrasonic power at 700W, and the stirring speed at 1000rpm, and react for 3 hours; then add 20mL of acetonitrile solution containing 0.5g of HTPB glue + TDI curing agent + organotin catalyst Add to the above solution, continue to react for 12h, cool to room temperature, filter, and vacuum dry to obtain off-white ADN / AlH 3 Composite energetic microspheres. Take 5gADN / AlH 3 Composite energetic microspheres and 5g of ADN and AlH3 mixture with a mass ratio of 1:1 were tested for hygroscopicity at a relative humidity of 75% and...

Embodiment 2

[0090] Dissolve 8g of ADN and 0.12g of GAP glue + TDI curing agent + organotin catalyst in 20mL of acetone; 4g of AlH 3 Put it into a beaker, add anti-solvent cyclohexane 100ml, under the double action of stirring and ultrasonic, keep AlH 3 In a suspension state, the ultrasonic power is 700W, and the stirring speed is 800rpm; the ADN solution is added dropwise at a rate of 0.5ml / min to the solution containing 4gAlH 3 In the cyclohexane dispersion, keep the temperature at 50°C, the ultrasonic power is 700W, the stirring speed is 800rpm, and react for 3h; then add 20mL of acetone solution containing 0.6g of PFPE glue + TDI curing agent + organotin catalyst Add to the above solution, continue to react for 8h, cool to room temperature, filter, and vacuum dry to obtain off-white ADN / AlH 3 Composite energetic microspheres. Take 5gADN / AlH 3 Composite energetic microspheres and 5g of ADN and AlH with a mass ratio of 2:1 3 The mixture was tested for hygroscopicity at a relative hum...

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Abstract

The present invention relates to a kind of ammonium dinitramide / aluminum trihydride (ADN / AlH 3 ) composite microsphere, its preparation method and the solid propellant comprising the composite microsphere, the structure of the composite microsphere is an ADN layer from the inside to the outside, the first reactive protective layer, AlH 3 layer and the second reactive protective layer, the structure-performance is adjustable, the preparation process is simple, safe and stable, and is suitable for the needs of scale-up production. The microsphere has low moisture absorption rate and low mechanical sensitivity, and has broad application prospects. The composite microspheres of the present invention are suitable for different adhesive-curing systems, can be used in HTPB, GAP adhesive-isocyanate curing agent systems and can also be used in GAP adhesive-alkyne-based curing agent systems, and have excellent The safety performance and pharmaceutical performance can significantly improve the low characteristic signal performance of solid propellants, which can be used in the research of high-energy propellant formulations, and is also suitable for the research on the performance improvement of butylated hydroxyl propellants.

Description

technical field [0001] The invention belongs to the field of propellant technology, in particular to an ADN / AlH 3 Composite microsphere, its preparation method and solid propellant containing the microsphere. Background technique [0002] The effective oxygen content of ADN (ammonium dinitramide) is close to that of AP (ammonium perchlorate), the oxygen balance is +25.8%, the enthalpy of formation is -149.8kJ / mol, and the crystal density is 1.812g / cm 3 , has the characteristics of high energy, large amount of gas formation, low toxicity, clean gas, and environmental friendliness. Using it to replace AP oxidizer can greatly improve the energy performance of the propellant, reduce the characteristic signal, and reduce environmental pollution. Studies have shown that using 40% ADN in HTPB (hydroxyl-terminated polybutadiene) propellants can increase the specific impulse of the propellant by 98N s / kg; ADN can increase the specific impulse by 7% when used in low characteristic si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C06B45/36C06B21/00
CPCC06B45/36C06B21/0066
Inventor 李磊陈红胡翔黄丹椿汪慧思杜芳陶博文邱贤平顾健庞爱民
Owner HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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