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Poly 2-methyl-2-nitropropanediol adipate and its preparation method and use

A technology of nitropropylene glycol ester and nitropropylene glycol, which is applied in the field of energetic materials, can solve the problems of low energy level and low energy level of inert polyester desensitizers, and achieve the effect of improving ballistic performance and anti-migration performance

Active Publication Date: 2021-05-18
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a macromolecular desensitizer with higher energy and better migration resistance and its preparation method for the shortcomings of the existing inert polyester desensitizers with low energy levels
[0005] The idea of ​​the present invention is based on the good migration resistance of polyester compounds with side chain structures, using energetic compounds as polymerized monomers, introducing energetic groups into the side chains of macromolecular desensitizing agents to replace the original inert group, to solve the problem of low energy level of inert polyester desensitizer, which not only has better anti-migration effect when used in propellants, but also can improve the detonation heat and projectile initial velocity

Method used

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  • Poly 2-methyl-2-nitropropanediol adipate and its preparation method and use
  • Poly 2-methyl-2-nitropropanediol adipate and its preparation method and use
  • Poly 2-methyl-2-nitropropanediol adipate and its preparation method and use

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Experimental program
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Effect test

Embodiment 1

[0017] Adipic acid (146g, 1mol) and 2-methyl-2-nitropropanediol (148.5g, 1.1mol) were added to 300mL of toluene, then 3g of p-toluenesulfonic acid was added, the temperature was raised to reflux of toluene, and the ester Condensation reaction, reaction 8h. After the reaction, the temperature was lowered to below 30° C., the reaction solution was washed with water, and the toluene was evaporated under reduced pressure to obtain 274.3 g of poly-2-methyl-2-nitropropanediol adipate with a yield of 99.2%.

[0018] Structural identification: IR, ν max (cm -1 ): 2951 (-CH 2 ), 2879 (-CH 3 ), 1734 (C=O), 1549, 1352 (C-NO 2 ), 1245(C-O), 737(-(CH 2 ) 4 -).

[0019] Properties: Appearance is yellow-brown solid; number average molecular weight 2972; molecular weight distribution 1.6324.

Embodiment 2

[0021] Add adipic acid (146g, 1mol) and 2-methyl-2-nitropropanediol (135g, 1mol) into 300mL of toluene, then add 3g of p-toluenesulfonic acid, heat up to toluene reflux, and carry out esterification condensation Reaction, reaction 6h. After the reaction, the temperature was lowered to below 30° C., the reaction liquid was washed with water, and the toluene was evaporated under reduced pressure to obtain 273.4 g of poly-2-methyl-2-nitropropanediol adipate with a yield of 98.9%.

Embodiment 3

[0023] Add adipic acid (146g, 1mol) and 2-methyl-2-nitropropanediol (121.5g, 0.9mol) into 300mL of toluene, then add 3g of p-toluenesulfonic acid, heat up to toluene reflux, and carry out esterification Condensation reaction, reaction 5h. After the reaction, the temperature was lowered to below 30° C., the reaction solution was washed with water, and the toluene was evaporated under reduced pressure to obtain 271.9 g of poly-2-methyl-2-nitropropanediol adipate with a yield of 98.3%.

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Abstract

The invention discloses an energetic insensitizer polyadipate 2-methyl-2-nitropropylene glycol ester for propellant and its preparation method and application, and polyadipate 2-methyl-2-nitropropylene glycol ester The structural formula is as follows: wherein 2≤n≤20, and n is an integer. Its preparation method takes adipic acid and 2-methyl-2-nitropropanediol as raw materials, comprising the steps of adding adipic acid and 2-methyl-2-nitropropanediol to toluene, then adding a catalyst, heating Reflux to toluene for esterification condensation reaction. After the reaction, the temperature was lowered to below 30°C, the reaction solution was washed with water, and the toluene was evaporated under reduced pressure to obtain poly-2-methyl-2-nitropropylene glycol adipate. The poly 2-methyl-2-nitropropylene glycol adipate synthesized by the invention is used as a desensitizing agent in propellants, and has better anti-migration performance, and higher detonation heat and projectile initial velocity than the inert desensitizing agent.

Description

technical field [0001] The invention belongs to the technical field of energetic materials, and in particular relates to an energetic insensitivity agent poly(2-methyl-2-nitropropanediol adipate) for propellant and its preparation method and application. Background technique [0002] Desensitizer is an important functional component of propellant, its function is to penetrate into the surface of propellant to form a thin layer of slow-burning substance, so as to reduce the gas generation rate at the initial stage of combustion, and when the slow-burning layer is gradually burned away, the gas generation rate gradually increases. Large, forming a progressive combustion. [0003] The currently commonly used desensitizers are camphor, dinitrotoluene (DNT), methyl neutralizing agent (C2), ethyl neutralizing agent (C1), dibutyl phthalate (DBP), phthalic acid Small molecular compounds such as diphenyl ester (DPP) have small molecular weight and strong diffusion and mobility. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/685C07C201/12C07C205/40C06B23/00
CPCC06B23/005C07C201/12C07C205/40C08G63/6856
Inventor 陈斌汪营磊丁峰刘亚静高福磊刘卫孝
Owner XIAN MODERN CHEM RES INST
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