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
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[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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