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Method for testing content of residual dimethyl sulfoxide in polyacrylonitrile precursor in carbon fiber production process

A polyacrylonitrile, production process technology, applied in the field of testing the residual dimethyl sulfoxide content in polyacrylonitrile raw silk, can solve the problems of high test equipment requirements, high cost, complicated use, etc., and achieve low and accurate detection requirements The effect of high test and detection efficiency

Inactive Publication Date: 2020-09-04
ZHONGJIAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above method can accurately test the content of dimethyl sulfoxide in the polyacrylonitrile precursor, it has high requirements for test equipment, high cost and complicated use.

Method used

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  • Method for testing content of residual dimethyl sulfoxide in polyacrylonitrile precursor in carbon fiber production process

Examples

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Effect test

Embodiment 1

[0038] This embodiment is a method for testing the content of residual dimethyl sulfoxide in polyacrylonitrile precursors during the production of carbon fibers, and its specific process is:

[0039] Step 1: Measure 4m polyacrylonitrile precursor and put it into a 1000mL round bottom flask, add 300mL deionized water in the flask;

[0040] Step 2: Add 10 zeolites into the round bottom flask, install a spiral condenser at the mouth of the flask, plug the upper end of the condenser with absorbent cotton, and place it on an electric heating mantle for heating;

[0041] Step 3: Stop heating after the aqueous solution boils for 3 hours, turn off the cooling water when the solution drops to room temperature, and rinse the condenser with 100mL deionized water;

[0042] Step 4: Transfer the solution in the round bottom flask to a 1000mL volumetric flask, pour the polyacrylonitrile precursor with 200mL deionized water, and prepare a 1000mL aqueous solution;

[0043] Step 5: Put the cle...

Embodiment 2

[0053] This embodiment is a method for testing the content of residual dimethyl sulfoxide in polyacrylonitrile precursors during the production of carbon fibers, and its specific process is:

[0054]Step 1: Measure 2m polyacrylonitrile precursor and put it into a 1000mL round bottom flask, add 300mL deionized water in the flask;

[0055] Step 2: Add 10 zeolites into the round bottom flask, install a spiral condenser at the mouth of the flask, plug the upper end of the condenser with absorbent cotton, and place it on an electric heating mantle for heating;

[0056] Step 3: Stop heating after the aqueous solution boils for 3 hours, turn off the cooling water when the solution drops to room temperature, and rinse the condenser with 100mL deionized water;

[0057] Step 4: Transfer the solution in the round bottom flask to a 1000mL volumetric flask, pour the polyacrylonitrile precursor with 200mL deionized water, and prepare a 1000mL aqueous solution;

[0058] Step 5: Put the clea...

Embodiment 3

[0068] This embodiment is a method for testing the content of residual dimethyl sulfoxide in polyacrylonitrile precursors during the production of carbon fibers, and its specific process is:

[0069] Step 1: Measure 3m polyacrylonitrile precursor and put it into a 1000mL round bottom flask, add 300mL deionized water in the flask;

[0070] Step 2: Add 10 zeolites into the round bottom flask, install a spiral condenser at the mouth of the flask, plug the upper end of the condenser with absorbent cotton, and place it on an electric heating mantle for heating;

[0071] Step 3: Stop heating after the aqueous solution boils for 3 hours, turn off the cooling water when the solution drops to room temperature, and rinse the condenser with 100mL deionized water;

[0072] Step 4: Transfer the solution in the round bottom flask to a 1000mL volumetric flask, pour the polyacrylonitrile precursor with 200mL deionized water, and prepare a 1000mL aqueous solution;

[0073] Step 5: Put the cle...

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Abstract

The invention relates to a detection method. Particularly, the invention relates to a method for testing the content of residual dimethyl sulfoxide in polyacrylonitrile precursor in a carbon fiber production process. The method comprises the steps: measuring a sample to be measured into a round-bottom flask; adding a certain amount of deionized water for mixing; after the solution is cooled, preparing a 1000mL aqueous solution, adding a certain amount of potassium permanganate solution, adding dilute sulfuric acid, uniformly shaking, measuring an aqueous solution prepared from a to-be-detectedsample, adding a potassium iodide solution, uniformly shaking, titrating with a sodium thiosulfate solution until the solution is light yellow, adding a starch indicator, and continuously dropwise adding until the solution is colorless. The testing method disclosed by the invention is a testing method capable of simply and accurately testing the content of the residual dimethyl sulfoxide in the polyacrylonitrile precursor, and the problem that the content of the residual dimethyl sulfoxide in the polyacrylonitrile precursor cannot be accurately tested at present is solved, so that the contentof the residual dimethyl sulfoxide in the precursor is accurately controlled.

Description

technical field [0001] The present invention relates to a kind of test method, specifically, relate to a kind of test method of residual dimethyl sulfoxide content in polyacrylonitrile precursor in the production process of carbon fiber. Background technique [0002] Polyacrylonitrile-based carbon fiber has a series of excellent performance, such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance and good electrical conductivity, thermal conductivity, etc., in advanced composite materials It has irreplaceable application value in various fields (including aerospace, aviation and advanced sporting goods, etc.). Dimethyl sulfoxide is usually used as a solvent in the production process of polyacrylonitrile. It is difficult to detect the residual dimethyl sulfoxide content in polyacrylonitrile raw silk by traditional methods. The residual content in the finished polyacrylonitrile raw silk affe...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 杨永岗胡培贤
Owner ZHONGJIAN TECH CO LTD
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