Method for detecting relative content of gel in polyacrylonitrile spinning solution

The invention relates to a method for detecting the relative content of gel in a polyacrylonitrile spinning solution, and relates to the technical field of carbon fiber production and detection. The detection method comprises the following steps: dissolving a polyacrylonitrile spinning solution to be detected according to a preset proportion by adopting an organic solvent to obtain a mixed solution; the method comprises the following steps: taking the time when an organic solvent is added into a polyacrylonitrile spinning solution to be measured as the initial dissolution time, sampling a mixed solution according to a preset time interval, measuring the absorbance of the mixed solution at different dissolution times, establishing a dissolution time-absorbance mapping relation, and determining the relative content of gel in the polyacrylonitrile spinning solution according to the mapping relation. The method provided by the invention is used for detecting the relative content of the gel in the polyacrylonitril