Hygienic chemical studies of high-acrylonitrile resin.

Abstract

Three kinds of high-acrylonitrile resin (acrylonitrile-methyl acrylate copolymer) were investigated for material and migration tests and pyrolysis. Material and migration tests showed that the amounts of heavy metals, acrylonitrile (AN) and methyl acrylate as volatile materials, nonvolatile residue, and KMnO4 consumption were under the regulated values for styrene-acrylonitrile copolymer and acrylonitrile-butadiene-styrene copolymer. Migration amount of AN monomer was determined to be 8-20 ng/ml in water, 5-6 ng/ml in 20% ethanol, 5-25 ng/ml in 4% acetic acid, and 22-27 ng/ml in n-heptane after treatment for 12 weeks at 37°C. Generation of AN monomer and CN-from the resins during pyrolysis at 800°C was 9.77-22.1 mg/g plastic and 53.9-134.8 mg/g plastic, respectively, and the generated AN monomer was completely trapped in n-heptane and rapidly decomposed in 1N NaOH.