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, w

Method used

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Examples

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Example Embodiment

[0026] Example

[0027] Online detection of dimethyl sulfoxide concentration in coagulation bath of a production line

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

[0029] 2) Determine the refractive index value Y of the standard solution 0 D...

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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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