Quantitative Infrared Analysis of Styrene-Acrylic-Melamine Resins

Abstract

This paper presents a method for rapid and accurate determination of individual components in modified thermosetting acrylic-coating resins. This technique is based on infrared-absorbance measurements at 1733 cm−1, 816 cm−1, and 700 cm−1 for the acrylate, melamine-formaldehyde, and styrene components, respectively. The accuracy and precision obtained on typical system of known composition have been found to be better than ±2% absolute for any one component. Furthermore, the analysis can be performed in minutes after the initial calibration work has been completed.

Analysis of acrylic polymers using combined Zeisel reaction-gas chromatography and infrared spectrometry

“…Styrene has been analyzed using a variety of chemical and instrumental techniques (21)(22)(23)(24)(25)(26). However, no reference is given to the absolute determination of styrene using infrared spectrophotometry, an approach which we feel gives the most utility.…”

Coatings

“…Post (93) made use of infrared spectra to determine the bound styrene in insoluble emulsion polymerized styrene-butadiene copolymers. In a manu- script on the quantitative infrared analysis of styrene-acrylic-melamine resins, Vandeberg (128) reported use of vacuum dried films and comparison of three absorption bands. Two papers outlined procedures for determining the composition of styrene and acrylonitrile copolymers; one is spectrophotometric (61), the other utilized nuclear magnetic resonance (15).…”