Damage self-healing polymer-based composite explosive and preparation method thereof

A polymer and self-healing technology, applied in the direction of explosives, aromatic nitration compositions, non-explosive/non-thermal agent components, etc., can solve the problems that the preparation methods are rarely reported, so as to prolong the life of explosive parts and make the preparation process simple , the effect of maintaining stability

Inactive Publication Date: 2019-08-27
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

Although these inventions have certain reference significance for the preparation of self-healing polymer materials, according to the existing public information, the current research on polymer-based composite materials that facilitate damage self-healing, especially polymer-based composite explosives Preparation methods are rarely reported

Method used

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  • Damage self-healing polymer-based composite explosive and preparation method thereof
  • Damage self-healing polymer-based composite explosive and preparation method thereof
  • Damage self-healing polymer-based composite explosive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1As shown, under nitrogen protection and mechanical stirring conditions, the polycaprolactone diol-2000 (40.00g, 0.02mol) after water removal, isophorone diisocyanate (8.90g, 0.04mol) and 20mL N, N-dimethylformamide was mixed thoroughly; the temperature was raised to 70°C, and the reaction was carried out at a constant temperature for 3 hours; and then lowered to room temperature to obtain a prepolymer solution with isocyanate at both ends. Slowly add 4,4'-diaminodiphenyl disulfide (4.97g, 0.02mol) into the prepolymer solution dropwise, raise the temperature to 60°C, and react for 3 hours to obtain a polyurethane pre-finished product with a disulfide bond; The pre-finished product was poured into a polytetrafluoroethylene mold, and baked in a blast oven at 60° C. for 24 hours to obtain 53.53 g of polyurethane (DSPU) with a disulfide bond. Spectrum peaks representing the disulfide bond structure appeared on the nuclear magnetic resonance spectrum and Rama...

Embodiment 2

[0028] Under nitrogen protection and mechanical stirring conditions, polytetrahydrofuran diol-1000 (30.00g, 0.03mol), hexamethylene diisocyanate (10.09g, 0.06mol) and 20mL N,N-dimethyl The formamide was thoroughly mixed; the temperature was raised to 70°C, and the temperature was reacted for 3 hours; then the temperature was lowered to room temperature, and a prepolymer solution with isocyanate at both ends was obtained. Slowly add 4,4'-diaminodiphenyl disulfide (7.46g, 0.03mol) into the prepolymer solution dropwise, raise the temperature to 60°C, and react for 3 hours to obtain a polyurethane pre-finished product with a disulfide bond; The preform was poured into a polytetrafluoroethylene mold, and baked in a blast oven at 60° C. for 24 hours to remove the solvent to obtain 47.30 g of polyurethane (DSPU) with a disulfide bond.

[0029] Dissolve 10.0g of polyurethane (DSPU) with a disulfide bond in 190.0g of 1,2-dichloroethane to prepare a 5% dilute solution; add 40.0g of hexa...

Embodiment 3

[0031] Under nitrogen protection and mechanical stirring conditions, polyethylene glycol-1000 (20.00g, 0.02mol), 4,4'-diphenylmethane diisocyanate (5.01g, 0.02mol) and 15mL N, N-dimethylformamide was mixed thoroughly; the temperature was raised to 70°C, and the reaction was carried out at a constant temperature for 3 hours; and then lowered to room temperature to obtain a prepolymer solution with isocyanate at both ends. Slowly add 4,4'-diaminodiphenyl disulfide (4.97g, 0.02mol) into the prepolymer solution dropwise, raise the temperature to 60°C, and react for 3 hours to obtain a polyurethane pre-finished product with a disulfide bond; The pre-finished product was poured into a polytetrafluoroethylene mold, and baked in a blast oven at 60° C. for 24 hours to remove the solvent to obtain 29.80 g of polyurethane (DSPU) with a disulfide bond.

[0032] Dissolve 10.0g of polyurethane (DSPU) with a disulfide bond in 115.0g of N,N-dimethylformamide to prepare an 8.0% dilute solution...

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Abstract

The invention discloses a preparation method of a damage self-healing polymer-based composite explosive. The preparation method comprises the following steps: step 1: firstly enabling excessive diisocyanate to react with polyether/ester diol to generate a prepolymer having -NCO groups at two ends; step 2: then enabling a diamine with a disulfide bond to react with the prepolymer having the -NCO groups at two ends to generate polyurethane having the disulfide bond; step 3: preparing the polyurethane having the disulfide bond into a diluted solution, adding an explosive in a metered proportion,heating the mixture to volatilize a solvent such that the polyurethane is precipitated and wraps the surface of the explosive, and filtering and drying to obtain the damage self-healing polymer-basedcomposite explosive. The high polymer product provided by the invention has a unique disulfide bond structure; after damage occurs inside the polymer-based composite explosive, dynamic exchange reaction of the disulfide bond occurs under a mild heating condition, so that the damaged part of the polymer-based composite explosive is re-bonded to recover the structure and the strength of the explosive.

Description

technical field [0001] The invention relates to the technical field of energetic composite materials, in particular to a damage self-healing polymer-based composite explosive and a preparation method thereof. Background technique [0002] Polymer-based composite explosive is a kind of energetic composite material composed of high polymer binder as the continuous phase and filled with a large number of explosive particles. field is widely used. Polymer-based composite explosives often form a certain initial damage during the manufacturing process, and are also subjected to various mechanical forces and temperature loads during subsequent processing, transportation, storage and use, and it is easy to generate new damage inside the composite explosive. damage. These damages in the form of holes and microcracks may further evolve into larger-scale macroscopic defects, leading to mechanical failure of polymer-based composite explosives, which in turn affects its safety performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B45/24C06B23/00C06B25/04C06B25/34C08G18/38C08G18/42C08G18/66
CPCC06B23/009C06B25/04C06B25/34C06B45/24C08G18/3868C08G18/4277C08G18/6651
Inventor 李玉斌丁玲潘丽萍张建虎杨志剑郑雪
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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