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Detection method for the changing law of plastic dissolution degree of nitrocellulose in propellant with high solid content

A technology with high solid content and regularity of change, applied in the direction of analysis using nuclear magnetic resonance, etc., can solve the problems of the development stage and the increase of the impact force of the particles, and achieve the effect of good physical and mechanical properties.

Inactive Publication Date: 2017-11-24
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0027] The NC content in the triguanide propellant formula has dropped to less than 20% (mass), and because the ignitability of the triguanide propellant is worse than that of conventional propellants, the ignition intensity of the ignition system matched with it will increase accordingly, which will inevitably make the ignition The impact force on the pellets increases accordingly
At the same time, some new methods have been researched, but they are still in the development stage.

Method used

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  • Detection method for the changing law of plastic dissolution degree of nitrocellulose in propellant with high solid content
  • Detection method for the changing law of plastic dissolution degree of nitrocellulose in propellant with high solid content
  • Detection method for the changing law of plastic dissolution degree of nitrocellulose in propellant with high solid content

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Experimental program
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Effect test

Embodiment 1

[0055] The new energetic plasticizer azidonitroamine DIANP is liquid at room temperature, not only has the advantages of high energy, high burning rate, low burning temperature, small relative molecular weight of gas, large gas production, etc., but also has good impact sensitivity, friction sensitivity and heat sensitivity. It is smaller than the commonly used energetic plasticizer NG.

[0056] DIANP can significantly improve the mechanical properties of propellants, especially the low-temperature mechanical properties compared with NG. DIANP is used to replace part of NG in standard propellants to make modified double-base or modified triple-base propellants, which have been mass-produced.

[0057] The purpose of the study in this example is to compare the plasticizing effects of DIANP and NG on NC in propellants with high solid content.

[0058] The thermal aging method is used to speed up the decomposition of NC, NG and DIANP in the propellant samples, and the samples are ...

Embodiment 2

[0087] The safe use of propellant is related to the ballistic performance of the weapon. At present, it is still impossible to establish the relationship between the thermal decomposition of the propellant in storage and the ballistic properties of the propellant. Therefore, it cannot be estimated, and its service life can only be determined through shooting tests. , extremely expensive. Although the safe service life can be judged by measuring the heat of propellant, the decrease of NC viscosity and mechanical properties in the propellant, the error is large and the factors are complicated. The mechanical properties of propellants with high solid content have a great influence on the ballistic performance. Researchers at home and abroad are looking for parameters to characterize the mechanical properties of propellants with high solid content more accurately, so as to judge the safe service life of propellants.

[0088] NC has a semi-rigid molecular chain. In order to improve...

Embodiment 3

[0096] The performance of propellants is not only related to the formula, but also closely related to the process. The improvement of propellant performance often brings innovation or improvement of technology and promotes the development of technology. Similarly, the development of technology meets the performance requirements of propellants, and products with uniform quality and stable performance can be manufactured economically and safely. When developing new propellant powder, it is always advocated that the manufacturing process of propellant powder should be adapted to the specific formula, and the principle of safe and economical production of high-quality propellant powder should not be limited to a certain unchanging process mode. . In fact, the improvement of specific process methods caused by different formulations often occurs. Therefore, the development of propellant technology has always been paid attention to, and it is one of the subjects of people's researc...

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Abstract

The invention discloses a detection method of change rule of plastisol moulding degree of nitro-cotton (NC) in a high-solid-content propellant. The method includes the steps of: a) firstly aging the propellant at a certain temperature for different times t to obtain a series of samples, and processing the samples into blocks being not more than 15*10*10 (mm*mm*mm) in size, and placing the sample blocks in special test tubes and performing low field nuclear magnetic detection to obtain transverse relaxation times T2 of the samples; and b) with the T2 as y-coordinate and t as x-coordinate, drawing a T2-t curve, which can reflect the change rule of the plastisol moulding degree of the NC in the samples with the t. The method, during detection, is free of change on spatial status of the NC and can actually show the plastisol moulding degree of the NC. The change rule of the plastisol moulding degree of the NC in the propellant with the t can serve as a basis of determining security service life of the propellant. The method also is a researching mean, wherein formula of the propellant can be regulated or manufacturing process can be improved by comparing the plastisol moulding degree of the NC in the propellants having similar formulas or being prepared through different technologies.

Description

technical field [0001] The invention belongs to the field of detection of physical and chemical properties of gunpowder, and mainly relates to a detection method for the degree of plastic dissolution of nitrocellulose in propellants with high solid content, in particular to a method for detection of the change rule of the degree of plastic dissolution of nitrocellulose in samples. Background technique [0002] Nitrocellulose is the product of esterification reaction between cellulose and nitric acid, and its molecular formula is [C 6 h 7 o 2 (OH) 3-x (ONO 2 ) x ] n . In appearance, nitrocellulose is not much different from cellulose before nitration, it is a white or yellowish solid fibrous material, tasteless. In my country, because most of the nitrocellulose is prepared from refined cotton, it is customary to call it nitrocellulose NC. [0003] At present, the artillery propellants used in large quantities mainly include single-base propellants, double-base propell...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08
CPCG01N24/08
Inventor 贾林常海张林军杜姣姣王琼张冬梅顾妍于思龙王芳芳
Owner XIAN MODERN CHEM RES INST
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