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Mar 9 – 11, 2015
NH Laguna Palace Hotel
Europe/Rome timezone

Can weathering and processing release a nanoscale transparent organic pigment from the polymer matrix of consumer products?

Mar 9, 2015, 11:54 AM
24m
Breakout 1 (NH Laguna Palace Hotel)

Breakout 1

NH Laguna Palace Hotel

Parallel session 1A: Occupational & Consumer Exposure 1A Occupational & Consumer Exposure

Speaker

Nicole Neubauer (BASF SE)

Description

"As nanomaterial containing materials may undergo changes during their production, use, and disposal, it is highly desirable to include their whole life cycle into an assessment of their safety. Coloristic pigments are used ubiquitously to give colour to plastics and paints. However, there is a knowledge gap with regard to their nano-specific safety. Therefore, we studied the release of an organic pigment (Red 254) from a PE matrix after weathering or processing by drilling and sanding. Representative for a final product (e.g. car bumper) small plates were investigated. After weathering according to ISO protocol 4892-2, release measurements were performed by centrifugation, spectroscopy and gloss retention. The results clearly demonstrated that the amount of release particles is below the limit of quantification of 10 ppm. In addition, no changes of the plate surface as wells as no free nanoparticles could be observed which was investigated by electron microscopy and XPS (X-ray photoelectron spectroscopy). Drilling and sanding of the plates were realized in an aerosol chamber. Number, size and morphology of the released fragments were determined by well-established aerosol measurement techniques and by electron microscopy, and show correlation with shear forces. "

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