39results about How to "Improve quality control efficiency" patented technology

The invention relates to a method for simultaneously detecting a solvent and moisture in a polyurethane elastic fiber production solvent recovery system. The method comprises the following steps: (1) preparing a series of DMAC and H2O standard solutions of different concentrations, and selecting a sufficient amount of representative calibration set samples; (2) determining a near-infrared spectral spectrogram of the calibration set samples, carrying out spectral pretreatment on a wave band, of 12,000-4000cm<-1>, of the spectrogram, then, respectively correlating with the content of DMAC and H2O in a standard sample, and establishing a DMAC content calibration model and a H2O content calibration model by adopting a partial least square method; (3) determining a near-infrared spectral spectrogram of a sample to be detected, treating the wave band, of 12,000-4000cm<-1>, of the obtained spectrogram by adopting the same pretreatment method as in the step (2), and substituting a light absorbance value, obtained after pretreatment, in the corresponding calibration model obtained in the step (2), thereby obtaining the content of DMAC in the sample to be detected. The method has the advantages that the analysis process is simple and rapid, the interference resistance is strong, the analysis is non-destructive, the sampling quantity is small, and the like.