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A method for detecting impurity content in cellulose nitrate

A technology for cellulose nitrate and impurity content, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problem of no quantitative detection method and so on.

Inactive Publication Date: 2018-06-29
SICHUAN NITROCELLULOSE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the current cellulose nitrate product standard (WJ9028-2005 specification for nitrocellulose for coatings) mainly uses visual observation of product appearance to test for impurities, and there is no quantitative detection method

Method used

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  • A method for detecting impurity content in cellulose nitrate
  • A method for detecting impurity content in cellulose nitrate
  • A method for detecting impurity content in cellulose nitrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dry the cellulose nitrate product (brand H5) produced from flocculent refined cotton in an oven at 100°C for 1 hour, accurately weigh 25.01g of the dried sample in a 500mL conical flask, add 100g of butyl acetate to dissolve the cellulose nitrate After complete dissolution, use 100 g of 95% (v / v) ethanol solution to dilute the solution in the Erlenmeyer flask and transfer it to a Erlenmeyer flask with a capillary tube. Shake well and settle for 3 hours in a vertical state. The results are shown in Table 2.

Embodiment 2

[0033] Dry the cellulose nitrate product (brand H1 / 8) produced from wood pulp in an oven at 80°C for 2 hours, accurately weigh 40.00g of the dried sample into a 500mL conical flask, add 160g of acetone to dissolve the cellulose nitrate After completion, use 160 g of 95% (v / v) ethanol solution to dilute the solution in the Erlenmeyer flask and transfer it to an Erlenmeyer flask with a capillary tube. After shaking well, settle in a vertical state for 2 hours. The results are shown in Table 2.

Embodiment 3

[0035] Dry the cellulose nitrate product (brand H1 / 2) produced from flocculent refined cotton in an oven at 105°C for 1 hour, accurately weigh 20.01g of the dried sample in a 500mL conical flask, add 100g of ethyl acetate to dilute the cellulose After the nitrate ester is completely dissolved, use 100 g of 95% (v / v) ethanol solution to dilute the solution in the conical flask and transfer it to a conical flask with a capillary tube, shake it up and settle in a vertical state for 2 hours. The results are shown in Table 2.

[0036] Table 2

[0037]

[0038] In summary, it can be seen that the present invention can not only quantitatively detect the content of impurities in cellulose nitrate, but also has high accuracy and good reproducibility.

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Abstract

The invention belongs to the technical field of analysis of cellulose nitrate, and in particular relates to a method for detecting impurity content in cellulose nitrate. The technical problem to be solved by the present invention is to provide a method for detecting the impurity content in cellulose nitrate, comprising the following steps: a, drying the cellulose nitrate to be tested to constant weight; b, accurately weighing the dried cellulose nitrate Cellulose nitrate, use solvent A to prepare it into cellulose nitrate solution; c, dilute the cellulose nitrate solution of step b with solvent B, then transfer to the Erlenmeyer flask with capillary; d, Erlenmeyer flask After standing still, measure the volume of the sediment in the capillary. This method has the advantages of fast analysis speed, simple operation and high accuracy, and can be well used for quantifying the impurity content in cellulose nitrate.

Description

technical field [0001] The invention belongs to the technical field of analysis of cellulose nitrate, and in particular relates to a method for detecting impurity content in cellulose nitrate. Background technique [0002] Cellulose nitrate is a kind of cellulose derivatives. It is the product of esterification reaction between cellulose and nitric acid. It is an important chemical product and is widely used as a film-forming substance, for example: as coatings, inks and Raw materials for explosives, etc. [0003] Impurities in cellulose nitrate products refer to substances that cannot be dissolved in a specific solvent to form a homogeneous solution in the product. The formation of these impurities is mainly due to the low purity of the main raw materials (such as cotton linters, etc.) used in the process of manufacturing cellulose nitrate, the incomplete esterification process and the foreign substances in the production process. [0004] Cellulose nitrate product is the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/82
Inventor 张仁旭薛刚熊仕明夏晓玉张尧石燕
Owner SICHUAN NITROCELLULOSE CORP