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Rapid analysis method of pulverizing and cutting degree of nitrocellulose

A nitrocellulose, rapid analysis technology, applied in the direction of analysis materials, measuring devices, instruments, etc., can solve the problems of large, burning in case of fire, large human operation error, large reading error, etc., to eliminate accidental errors and reduce power consumption. consumption, good stability

Inactive Publication Date: 2019-03-15
SICHUAN NITROCELLULOSE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nitrocellulose is highly flammable and explosive, and its danger depends on the degree of nitrification. Nitrocellulose with a nitrogen content of more than 12.5% ​​is extremely dangerous. It will burn when exposed to fire, and its decomposition can be accelerated when the temperature exceeds 40°C. And spontaneous combustion; although nitrocellulose with a nitrogen content of less than 12.5% ​​is relatively stable, it will gradually decompose and release acid when heated or stored for a long time, which lowers the ignition point and may spontaneously ignite and explode.
The invention uses dehydrated nitrocellulose samples for analysis, and the time for dehydration and moisture analysis is short, which can greatly shorten the time for analyzing the fineness of energetic nitrocellulose. However, the operation process of this analysis method is manual operation, and the error of human operation is still large, and the sample settles. Unevenness will lead to large reading errors, so it is necessary to establish a simpler and more accurate method for analyzing the fineness of nitrocellulose

Method used

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  • Rapid analysis method of pulverizing and cutting degree of nitrocellulose
  • Rapid analysis method of pulverizing and cutting degree of nitrocellulose
  • Rapid analysis method of pulverizing and cutting degree of nitrocellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Select 4 groups of Class A nitrocellulose with different fineness for fiber test, use fiber quality analyzer to count the fiber length Lc(n) / mm value, and use existing standard method to obtain fineness, as shown in Table 1, figure 1 Shown:

[0033] Table 1

[0034]

[0035] Carry out linear fitting, obtain the relational formula of the cellulose fiber length and the degree of fineness to be fiber length=a* degree of fineness+b, wherein a is 0.0015, and b is 0.2399, by figure 1 It can be seen that the fiber length obtained from the analysis has a very good correlation with the degree of fineness, and the correlation coefficient R can reach 0.9997. Therefore, when analyzing the fineness of Class A nitrocellulose, it is only necessary to analyze and count the fiber length, and then enter the relational formula: fiber length = 0.0015 × fineness + 0.2399, to obtain the fineness of Class A nitrocellulose.

Embodiment 2

[0037] Select 4 groups of B-type nitrocellulose with different fineness for fiber test, use fiber quality analyzer to count the fiber length Lc(n) / mm value, and use existing standard method to obtain fineness, as shown in Table 2, figure 2 Shown:

[0038] Table 2

[0039]

[0040] Carry out linear fitting, obtain the relational formula of the cellulose fiber length and the degree of fineness to be fiber length=a* degree of fineness+b, wherein a is 0.0028, b is-0.0588, by figure 2 It can be seen that the correlation between the fiber length and the degree of fineness obtained by the analysis is very good, and the correlation coefficient R can reach 0.9986. Therefore, when analyzing the fineness of Class B nitrocellulose, it is only necessary to analyze and count the fiber length, and then enter the relational formula: fiber length = 0.0028 × fineness - 0.0588, to obtain the fineness of Class B nitrocellulose.

Embodiment 3

[0042] Select 4 groups of D-type nitrocellulose with different fineness for fiber test, use the fiber quality analyzer to count the fiber length Lc(n) / mm value, and use the existing standard method to obtain the fineness, as shown in Table 3, image 3 Shown:

[0043] table 3

[0044]

[0045] Carry out linear fitting, obtain the relational expression of chemical cellulose fiber length and fineness degree to be fiber length=a* fineness degree+b, wherein a is 0.0041, and b is 0.0297, by image 3 It can be seen that the correlation between the fiber length and the degree of fineness obtained by the analysis is very good, and the correlation coefficient R can reach 0.9552. Therefore, when analyzing the fineness of Class D nitrocellulose, it is only necessary to analyze and count the fiber length, and then enter the relational formula: fiber length = 0.0041 × fineness + 0.0297, to obtain the fineness of Class D nitrocellulose.

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Abstract

The invention discloses a rapid analysis method of the pulverizing and cutting degree of nitrocellulose. The rapid analysis method comprises the following steps: extracting at least three samples withdifferent pulverizing and cutting degrees from the nitrocellulose to be tested, and analyzing fiber lengths of the nitrocellulose samples, wherein the fiber length is a weighted average of the lengthof the nitrocellulose sample; determining the pulverizing and cutting degrees of the nitrocellulose samples by adopting an existing analysis method of the pulverizing and cutting degree of the nitrocellulose; performing linear fitting on the measured fiber lengths of the nitrocellulose samples and the pulverizing and cutting degrees to obtain a relational expression: fiber length = a * pulverizing and cutting degree + b, namely a relational expression between the fiber length of nitrocellulose and the pulverizing and cutting degree. According to the rapid analysis method, sample pretreatmentand drying and water shaking are not needed, so that a multi-step water shaking process is simplified, and power consumption and water consumption are reduced; the analysis period is shortened from 3hours to 10 minutes, which improves the analysis efficiency and simplifies the operation process. The rapid analysis method can effectively eliminate accidental errors such as a manmade mistake, effectively predict the pulverizing and cutting degrees of the nitrocellulose and effectively guide the production.

Description

technical field [0001] The invention relates to the field of a method for analyzing the fineness of nitrocellulose, in particular to a method for analyzing the fineness of nitrocellulose with fast analysis speed. Background technique [0002] Cellulose nitrate, commonly known as nitrocellulose or nitrocellulose, is the product of the reaction between cellulose and nitric acid, and its molecular formula is C 6 h 7 o 2 (ONO 2 ) a (OH) 3-an , where a is the degree of esterification and n is the degree of polymerization. Nitrocellulose was originally used in the military field as an important raw material for the manufacture of propellants, missiles, and rocket propellants; with the development of science and technology, the application range of nitrocellulose is no longer limited to military products, but is reflected in all aspects of daily life , such as automotive paint, solid alcohol, and adhesives for electronic products. Nitrocellulose is highly flammable and explo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/22
CPCG01N33/227
Inventor 孟先利张仁旭骆霞夏晓玉阳洪
Owner SICHUAN NITROCELLULOSE CORP
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