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Method for determination of PCTFE content in PBX explosive by near infrared spectrum

A PCTFE and near-infrared spectroscopy technology, which is applied in the field of rapid non-destructive detection of explosives, can solve problems such as weak absorption and weak spectral information, and achieve the effects of reducing analysis errors, simple operation, and easy on-line detection

Active Publication Date: 2013-04-03
XIAN MODERN CHEM RES INST
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Problems solved by technology

There are no X-H bonds in the molecular structure of PTFE and PCTFE, only C-F and C-Cl bonds, and the absorption is weak in the near-infrared spectrum region; in addition, the content of PTFE and PCTFE in PBX explosives is generally 0.5%~1.5%, so it is the main component of PBX explosives. The spectral information of the components is very weak compared to the spectral information of PTFE and PCTFE components

Method used

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  • Method for determination of PCTFE content in PBX explosive by near infrared spectrum
  • Method for determination of PCTFE content in PBX explosive by near infrared spectrum
  • Method for determination of PCTFE content in PBX explosive by near infrared spectrum

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Embodiment 1

[0038] Step 1: Prepare and collect PBX explosive samples and collect spectral data

[0039] 1) The PCTFE content in the design and preparation samples ranges from 0.1% to 3.0% and is evenly distributed. It is required that the content of other components should not be linearly related. The number of samples to be prepared is 80;

[0040] 2) Collect 180 samples produced in different batches, select all collected and prepared samples according to the PCTFE content and select 10 samples before and after each. Two samples in the middle are taken every other, a total of 180 samples are used as calibration sets, and the remaining 80 As a validation set;

[0041] 3) Take about 10g sample in a sample cup with a diameter of 5cm, and use a Fourier transform near-infrared spectrometer to collect near-infrared spectroscopy data of all samples on a rotating sample stage in a diffuse reflection mode. The detector is PdS and the scanning wavelength range is 12,500 cm. -1 ~4000cm -1 , Resolution 8cm...

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Abstract

The invention discloses a method for determination of the polychlorotrifluoroethylene (PCTFE) content in a polymer-bonded explosive (PBX) by near infrared spectroscopy. The method includes the steps of: preparing and collecting 260 PBX samples, taking 180 samples of them as a calibration set for establishing a calibration model, taking the remaining 80 samples as a validation set for model validation, and acquiring the near infrared spectrum data of all the samples; using a standard method to determine the PCTFE content in the samples; subjecting the spectrum data of the validation set samples in the wave bands of 6102.0cm<-1>-5697.0cm<-1> and 4680.2cm<-1>-4242.9cm<-1> to a first order derivative treatment, correlating the treated spectrum data with the PCTFE content by a partial least squares method, and establishing the calibration model by cross validation; employing the calibration model to predetermine the PCTFE content of the validation set samples, and selecting an optimal model according to a minimum root mean squared error of prediction (RMSEP) of the validation set; and acquiring the near infrared spectrum data of the samples to be determined, and making use of the optimal model to obtain the PCTFE content directly. Being suitable for determination of the PCTFE content in a PBX explosive, the method has the characteristics of convenient operation, and rapid and accurate analysis.

Description

Technical field [0001] The invention belongs to the technical field of rapid nondestructive detection of explosives and relates to a method for rapid detection of explosive components by near infrared spectroscopy. Specifically, it is a method to quantify the PCTFE content in PBX explosives using near-infrared spectroscopy. Background technique [0002] PBX explosives endow mixed explosives with better comprehensive properties, such as higher energy density, excellent mechanical properties and higher safety performance, and have been widely used in national defense and related fields. In PBX explosives, the content of polymer materials generally does not exceed 3%, which can usually significantly improve the safety performance, process performance, mechanical properties and physical and chemical stability of the explosive. The detection of the component content is the explosive production and quality assurance Necessary testing items. [0003] The binders in PBX explosives are ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/35G01N21/359
Inventor 温晓燕张皋陈曼杨彩宁赵娟张婷梁忆刘红妮贾林
Owner XIAN MODERN CHEM RES INST
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