ODOUR AND EMISSIONS | TECHNOLOGY
possibility of using the material for car interior parts, decontaminated post-consumer polypropyl- enes supplied by two different recyclers (rPP1 and rPP2) were analysed in accordance with three automotive standards: VDA 277 to determine the total content of VOCs; VDA 278 to determine VOCs and SVOCs by thermal desorption; and VDA 270 to determine the intensity of the odour emitted by the materials.
Under the VDA 277 determination, the initial
concentration of volatiles for the two samples was measured at 124 µg/g and 80 µg/g respectively. After devolatilisation those values were reduced significantly to 2.97 µg/g and 0.83 µg/g. Under VDA 278, rPP1 showed initial VOC and FOG contents of 88 mg/g and 252 mg/g, while levels in rPP2 were 57 mg/g and 166 mg/g. After decontamination, the values in rPP1 were reduced to 7.1 mg/g and 38 mg/g respectively, and in rPP2 they were down to 9.5 mg/g and 49 mg/g. As far as odour was concerned (VDA 270), the rating for rPP1 dropped from 4 to 3, and for rPP2 fell from 4.5 to 3.5. Roca says the decontamination rates, according to VDA 277, of 97.6% and 98.8 respectively,
demonstrate the high potential that this decon- tamination methodology holds. UK-based compounder and recycler Luxus, which includes automotive as a major market for its product, already has considerable experience in managing odour issues. The company estimates that by deodorising post-consumer material that would otherwise be unusable it could divert as much as 25,000 tonnes of waste from landfill or incineration each year. The resulting net saving in CO2
emissions could amount to around one tonne
per tonne of polymer recovered, it says. The company is approaching the end of a 33-month grant-funded R&D project — Project Odour Control — that was set up to develop a validated prototype of a process that could provide a cost-effective method for identifying odour and deodorising recycled polymer. Luxus Managing Director Peter Atterby says the company and its partners have developed “two or three” technolo- gies that can be implemented at different parts of the production process to purge odours from waste materials. The project is managed by Luxus in collabora- tion with the UK’s University of Lincoln, which has
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> Peptizers > Plasticizers > Polyethylene Waxes > Processing Agents > Silane Coupling Agents > Slip Agents (Amides) > Tackifiers > Viscosity Modifiers
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