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Explosive modified by grafting in-situ hyperbranched polyurethane as well as preparation method and application of explosive

A technology of hyperbranched polyurethane and graft modification, which is applied in the direction of explosives, non-explosive/non-thermal agent components, offensive equipment, etc. It can solve the problem that the weak interface between coupling agent and explosives cannot be solved, which is unfavorable for the development of water suspension granulation preparation process , the coating strength of the coupling agent is not high, etc., to achieve the effect of reducing creep deformation, easy to realize, and improving mechanical properties

Active Publication Date: 2019-05-17
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

[0003] Modifying the surface of explosives by introducing coupling agents or bonding agents is a common way to improve the interface. The functional groups of coupling agents can interact with nitro or amine groups on the surface of explosives, which can improve the interface between explosives and binders to a certain extent. , but this adjustment is very limited, the coating strength of the coupling agent is not high, and it is easy to fall off
Further, on the basis of the pretreatment of HMX by the coupling agent, the in-situ reaction coating can effectively improve the interface coating and interaction between HMX and the reactive binder, but it must also be established on the basis of the coupling agent. On the basis of pre-modification, the weak interface between the coupling agent and the explosive is always unresolved
In recent years, using polydopamine's strong adhesion to the surface of almost all organic and inorganic materials (Science, 2007, 318, 426-430), researchers designed new polydopamine interfaces on the surface of explosives with low surface energy and inert reaction characteristics. Layer, to achieve all-round strong coating on the surface of explosives, improve the interface interaction with the binder, and improve the mechanical properties (J.Mater.Chem.A, 2017, 5, 13499-13510), but only rely on polydopamine modification , will introduce excessive -OH groups on the surface of the explosive, resulting in an increase in hydrophilicity, which is not conducive to the development of the water suspension granulation preparation process, and the improvement of mechanical properties is also limited

Method used

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  • Explosive modified by grafting in-situ hyperbranched polyurethane as well as preparation method and application of explosive
  • Explosive modified by grafting in-situ hyperbranched polyurethane as well as preparation method and application of explosive
  • Explosive modified by grafting in-situ hyperbranched polyurethane as well as preparation method and application of explosive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1: Weigh 0.96g of Tris and dissolve it in 800ml of deionized water, add hydrochloric acid dropwise to prepare a buffer solution with a pH value of 8.5, then add 50g of TATB to the buffer solution, stir and disperse, add 1.92g of dopamine, and start The self-polymerization reaction is completed after 4 hours, washed with deionized water, suction filtered, and vacuum-dried in an oven at 60°C to obtain a polydopamine-premodified explosive;

[0024] Step 2: Add the pre-modified explosive obtained in Step 1 to 600g of butyl acetate, ultrasonically disperse, add 0.5g of catalyst dibutyltin dilaurate, 3g of toluene diisocyanate, stir at 300rpm, and react at 80°C for 1.5h Finished, washed with butyl acetate, and suction filtered. Then transfer to 600g of tetrahydrofuran solvent, heat in a water bath at 60°C, add dropwise 0.5g of catalyst dibutyltin dilaurate, and gradually add 3g of toluene diisocyanate, 1g of diethanolamine monomer, then continue to react for 2h, tetrahyd...

Embodiment 2

[0028] Step 1: Weigh 0.96g of Tris and dissolve it in 800ml of deionized water, add hydrochloric acid dropwise to prepare a buffer solution with a pH value of 8.5, then add 50g of TATB to the buffer solution, stir and disperse, add 1.92g of dopamine, and start The self-polymerization reaction is completed after 6 hours, washed with deionized water, suction filtered, and vacuum-dried in an oven at 60°C to obtain a polydopamine-premodified explosive;

[0029] Step 2: Add the pre-modified explosive obtained in step 1 into 600g of butyl acetate, ultrasonically disperse, add 0.5g of catalyst dibutyltin dilaurate, 3g of 4,4'-diphenylmethane diisocyanate, and stir at 350rpm, The reaction was completed after 1.5 h at 80° C., washed with butyl acetate, and suction filtered. Then transferred to 600g tetrahydrofuran solvent, heated in a water bath at 60°C, added dropwise 0.5g catalyst dibutyltin dilaurate, and gradually added 3.3g 4,4′-diphenylmethane diisocyanate, 0.8g diethanolamine mono...

Embodiment 3

[0033] Step 1: Weigh 0.96g of Tris and dissolve it in 800ml of deionized water, add hydrochloric acid dropwise to prepare a buffer solution with a pH value of 8.5, then add 50g of LLM-105 to the buffer solution, stir and disperse, then add 1.92g of dopamine , start the self-polymerization reaction, end after 6h, wash with deionized water, filter with suction, and dry in a 60°C oven in vacuum to obtain a polydopamine-premodified explosive;

[0034] Step 2: Add the pre-modified explosive obtained in Step 1 to 600g of butyl acetate, ultrasonically disperse, add 0.5g of catalyst dibutyltin dilaurate, 3g of toluene diisocyanate, stir at 300rpm, and react at 80°C for 1.5h Finished, washed with butyl acetate, and suction filtered. Then transfer to 600g tetrahydrofuran solvent, heat in a water bath at 60°C, add dropwise 0.5g catalyst dibutyltin dilaurate, and gradually add 1.5g toluene diisocyanate, 0.5g diethanolamine monomer, 3.0g polybutylene adipate Diol (PBA, M n 600), then co...

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Abstract

The invention discloses explosive modified by grafting in-situ hyperbranched polyurethane as well as a preparation method and application of the explosive. The preparation method comprises the following steps: (1) adding explosive into a Tris deionized water buffering solution, stirring and dispersing; (2) adding dopamine, uniformly stirring, carrying out a self-polymerization reaction of dopamineon the surface of the explosive, washing by using deionized water after the reaction is completed, carrying out suction filtration and vacuum drying to obtain the pre-modified explosive with dopaminepolymerized on the surface; and (3) adding the pre-modified explosive into butyl acetate, dispersing, increasing temperature, adding A2 type monomers and dibutyltin dilaurate, reacting, then washingby using butyl acetate, carrying out suction filtration, then transferring the explosive to a second solvent, dropwise adding dibutyltin dilaurate, gradually adding a monomer mixture and reacting, washing for four times after the reaction is completed, carrying out suction filtration, and drying to obtain the explosive modified by grafting in-situ hyperbranched polyurethane. The method improves the property of the surface of the explosive and enhances bonding strength between a bonding agent and an explosive interface.

Description

technical field [0001] The invention relates to the technical field of preparation of modified explosives, in particular to an in-situ hyperbranched polyurethane graft modified explosive and its preparation method and application. Background technique [0002] As a polymer composite material highly filled with explosive particles (filling amount is usually above 90wt%), the mechanical properties of PBX hybrid explosive mainly depend on the internal binder and the interface characteristics between the explosive and the binder, and once the bonding agent is properly bonded The binder is determined, and the interface will become the decisive factor affecting the PBX mixed explosives. The research shows that because the interface between explosive particles and binder is not strong and the coating is not complete, interface debonding is the main reason for inducing cracking of PBX components and becomes an important link affecting its mechanical properties. How to enhance the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B23/00C08G18/32C08G18/42C08G18/48C08G18/66C08G73/06
Inventor 何冠松孟力李鑫田新曾贵玉蒋跃强
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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