Determination of Free Toluene Diisocyanate Content in Coating Solidifying Agent by Near Infrared Spectroscopy

doi:10.3724/SP.J.1095.2014.30402

Chinese Journal of Applied Chemistry

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Determination of Free Toluene Diisocyanate Content in Coating Solidifying Agent by Near Infrared Spectroscopy

CHEN Jiwen^*, LIU Fujian, SHEN Honglin, LI Jun, CHEN Lvping

(Guangdong Testing Institute of Product Quality Supervision,Shunde 528300,China)

Received:2013-08-04 Revised:2013-10-27 Published:2014-05-10 Online:2014-05-10

Abstract

Abstract: A rapid determination method of free toluene diisocyanante(TDI) content in coating solidifying agent was developed by near infrared spectroscopy(NIR), with GC analysis values as the reference. NIR transmission spectrum of the solidifying agent was first collected. Among the 120 samples analyzed, 109 representative samples were selected to establish TDI content of predictive models with the NIR wave numbers between 7320~7250 cm-1 and 8485~8370 cm-1, by the partial least squares(PLS) and fully-interactive authentication methods. The results showed that the free TDI contents in the solidifying agent of and the near-infrared spectra correlate very well. The calibration set RMSEC was 0.0815 and validation set RMSEP was 0.0715. This proofed the performance of the working model, and indicated that NIR spectroscopy can be used for fast and accurate determination of TDI content in solidifying agent samples.

Key words: free toluene diisocyanante, near infrared reflectance spectroscopy(NIR), partial least square (PLS)

CLC Number:

O657.3
TS47

CHEN Jiwen*, LIU Fujian, SHEN Honglin, LI Jun, CHEN Lvping. Determination of Free Toluene Diisocyanate Content in Coating Solidifying Agent by Near Infrared Spectroscopy[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.30402.

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Determination of Free Toluene Diisocyanate Content in Coating Solidifying Agent by Near Infrared Spectroscopy

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