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Method for on-line detection of coagulation bath concentration in production of polyacrylonitrile strands for carbon fibers

A technology of polyacrylonitrile and coagulation bath, which is applied in the field of measurement, can solve problems such as time-consuming, inaccurate test results, and inability to realize online detection, and achieve the effect of improving timeliness and rapid test methods

Inactive Publication Date: 2010-10-27
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to provide an online detection method of coagulation bath concentration in the production of polyacrylonitrile precursor for carbon fiber, which solves the technical problems of long time-consuming, inaccurate test results and inability to realize online detection in the existing coagulation bath concentration detection method

Method used

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Examples

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Embodiment

[0027] On-line detection of dimethyl sulfoxide concentration in coagulation bath of a certain production line

[0028] 1) Preparation of dimethyl sulfoxide standard solution: use the same raw material in the production of polyacrylonitrile precursor for carbon fiber to prepare different concentrations of dimethyl sulfoxide standard solution; assume that the integer value of the dimethyl sulfoxide concentration in the measured coagulation bath is α%, the number of concentration standard solutions prepared is 7 or more, one of which is α%, the value of the other half of the concentration standard solutions is less than α%, and the value of the other half of the concentration standard solutions is greater than α%, The distance between the concentration values ​​of two adjacent standard solutions is 0.01×α%~0.05×α%; 11 points are selected in this example, see Table 1 for details.

[0029] 2) Measure the refractive index value Y of the standard solution 0 Determination: use a ref...

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Abstract

The invention relates to a method for the on-line detection of coagulation bath concentration in the production of polyacrylonitrile strands for carbon fibers, which comprises the following steps: 1) preparing a dimethyl sulfoxide standard solution; 2) manufacturing a standard curve equation; 3) connecting devices; 4) carrying out on-line detection; and 5) calculating the concentration. The invention solves the technical problems that the existing coagulation bath concentration detecting method is time-consuming, the detection result is inaccurate and the on-line detection can not be realized. Besides, the invention is beneficial to improving the timeliness, the dynamic nature and the accuracy of the concentration control of dimethyl sulfoxide in the coagulation bath. The detecting method is fast, accurate and visual, and is suitable for automatic production.

Description

technical field [0001] The invention belongs to the technical field of measurement, and in particular relates to an online detection method for coagulation bath concentration in the production of polyacrylonitrile precursors for carbon fibers. Background technique [0002] Polyacrylonitrile-based carbon fiber has the characteristics of high specific strength, high specific modulus, low density, high temperature resistance, corrosion resistance, creep resistance, and strong stability. There are very broad applications. The production process of polyacrylonitrile-based carbon fiber includes three links: spinning dope polymerization, raw silk production, raw silk pre-oxidation and carbonization, among which raw silk production is the key link, and the quality and stability of the raw silk have a great impact on the quality of the final carbon fiber product. Quality and stability have a decisive influence. The production process of raw silk mainly includes the stages of spinni...

Claims

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Application Information

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IPC IPC(8): G01N21/41
Inventor 王浩静刘福杰范立东李福平程璐王红飞庞培东刘欢
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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