Emissions and Recovery of Texanol Ester AlcoholFollowing Latex Paint Applications

摘要

The significance of paint products as sources of indoor (S)VOCs is underscored by thevolume produced for interior use. Over 700 million gallons/year of architectural coatingsare produced in the U.S. alone, with 64% classified for interior use. We focused onemissions of one component of latex paints, 2,2,4-trimethyl-1,3-pentadediolmonoisobutyrate (TMPD-MIB). Previous research related to TMPD-MIB has beenlimited by short analysis periods and poor mass closure. We employed two substrates(gypsum board and aluminum) and two solutions containing TMPD-MIB (flat and semiglosslatex paint). The first 48 hours of each experiment involved small chamber testing.Thereafter, specimens were maintained in an office environment with intermittentrotation into chambers. Specimens were analyzed for periods of 4-10 months, and wereultimately “sacrificed” to determine TMPD-MIB in the dried paint film and substrate.Emissions were observed for each substrate over the entire experimental period, but weregenerally low after approximately 150 hours. Airborne recoveries of TMPD-MIB were astrong function of the type of paint and substrate. Most of the residual was recovered inthe dried paint film and substrate (in the case of gypsum board), with a bias towardslightly less than 100% (air + paint film) mass closure. Mass closure analyses showedgreat, but consistent, differences in the component distribution of TMPD-MIB betweensubstrates and type of paint. Results of this study are novel and add to the existingknowledge base related to the emissions and general fate of paint components in indoorenvironments.