University of Twente Student Theses


Hergebruik coatingpoeder afval

Withagen, I. (2016) Hergebruik coatingpoeder afval.

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Embargo date:25 August 2066
Abstract:During the powder coating process waste, consisting mainly of unhardened thermosets in powder form, is build up. Currently this waste powder is dumped in landfills, wasting this raw material. As a result, new powder has to be produced and since this is not a renewable material the stock of this material will decrease. To target this loss of waste powder, research into various possibilities to recycle the waste coatingpowder was conducted during this bachelor thesis. At the start of this thesis several lines of inquiry were set along which the research would take place, which included: application of thermoset processing methods on the restpowder, incorporating the restpowder as matrixmaterial in fibre reinforced composites, using existing powder assimilation methods to process the restpowder, using the restpowder as primer or filler and finally investigating the recycle options of the powder after it has been processed in previously mentioned solution directions. The feasibility of these solution directions was determined through literature study and experimental testing. During testing it was revealed that using thermoset processing methods creates a material that is very brittle and contains air bubbles which arise during the hardening process. Using the thermoset production methods or existing powder processing methods for processing the waste powder are therefore not applicable. Since the hardened material is very brittle using the cured powder as matrix material for fiber reinforced composites is not suitable. If a method can be found to separate the different types of waste powder new research can be conducted into these methods. The research also showed that the waste powder could be used as a primer, the bond that is formed between the metal surface and waste powder primer is adequate. However because the surface quality of the primer, due to bubble formation, is rather low and the cost difference between a normal and waste powder primer is minimal, a waste powder primer is not preferable to a new primer. In this research the possibility to use the rest powder as filler in concrete and paint was also investigated. Due to the brittle nature of the hardened waste powder material it is not usable as a reinforcing filler in concrete. Additionally the waste powder cannot be used as filler in paint because the hardening reaction starts to fast which decreases the viscosity of the paint mixture to a point where it is no longer paintable. During the literature study a company was found that uses the restpowder as filler in automotive parts. However this company only uses powders that have been separated based on material type and the other waste powder are burned for energy recovery which is an irreversible resource loss. Finally, the restpowder can be processed into a rigid foam. By adding a hardener and water to the waste powder a reaction occurs forming a gas, which results in the creation of a rigid foam. This foam can be used as an alternative for purfoam in strong lightweight products or as isolation material. Furthermore there are good existing recycling options for rigid foams. Additional research is required to find the right proportions of restpowder, hardener and water to create a satisfactory foam. Also the influence of a catalyst, appropriate processing methods and possible applications should be determined.
Item Type:Essay (Bachelor)
Faculty:ET: Engineering Technology
Subject:20 art studies
Programme:Industrial Design BSc (56955)
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