SIMULTANEOUS DETERMINATION OF PHENOL, FORMALDEHYDE AND BENZYL ALCOHOLIN MANNICH PRODUCTS USED AS CURING AGENTS FOR EPOXY-RESINS BY DIRECT GAS CHROMATOGRAPHIC-FID ANALYSIS
Cp. Lamela et al., SIMULTANEOUS DETERMINATION OF PHENOL, FORMALDEHYDE AND BENZYL ALCOHOLIN MANNICH PRODUCTS USED AS CURING AGENTS FOR EPOXY-RESINS BY DIRECT GAS CHROMATOGRAPHIC-FID ANALYSIS, Analusis, 21(9), 1993, pp. 367-371
Of the many agents suitable for curing epoxy resins at room temperatur
e. those with a Mannich base product as the main component are frequen
tly selected because of their relatively low viscosity and particularl
y good curing properties. However, most commercially available Mannich
base curing agents contain free phenol, which accelerates the epoxy-a
mine reaction but is subject to legal limits for toxicological reasons
. We describe here a direct gas-chromatographic-FID method for the sim
ultaneous determination of residual levels of phenol, formaldehyde and
benzyl alcohol in Mannich formulations prepared for use as curing age
nts for epoxy resins. Knowledge of these levels allows the conditions
of synthesis of such formulations to be optimized so that emission of
these raw materials is minimized. The analytical method is sensitive a
nd linear over a wide range of concentrations.