Determination of isocyanate and aromatic amine emissions from thermally degraded polyurethanes in foundries
Thermal degradation of polyurethanes can cause emissions of isocyanates and aromatic amines into work atmospheres. Results from laboratory studies on the use of 4,4'-methylenediphenyl isocyanate (MDI)-based polyurethane bound foundry core materials showed that anilines and phenyl isocyanates are major degradation products, but the possibility for emissions of MDI and its corresponding diamine, 4-4'-methylenedianiline, also was demonstrated. Results from field investigations in two different foundries showed that of these degradation products, mainly anilines and phenylisocyanates are found in foundry work atmosphere, whereas MDI and methylenedianiline concentrations were negligible. The selection of air sampling and analytical procedures for, as well as interpretation of results from, simultaneous determination of isocyanates and their corresponding amines are discussed.
- Research Organization:
- Univ. of Lund, Sweden
- OSTI ID:
- 6765898
- Journal Information:
- Am. Ind. Hyg. Assoc. J.; (United States), Journal Name: Am. Ind. Hyg. Assoc. J.; (United States) Vol. 47:10; ISSN AIHAA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION MONITORING
AMINES
ANILINE
AROMATICS
DATA
EMISSION
EXPERIMENTAL DATA
FOUNDRIES
GASEOUS WASTES
INDUSTRIAL PLANTS
INFORMATION
ISOCYANATES
MATERIALS
MEASURING METHODS
NUMERICAL DATA
OCCUPATIONAL EXPOSURE
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYAMIDES
POLYMERS
POLYURETHANES
SYNTHETIC MATERIALS
THERMAL DEGRADATION
WASTES