Abstract
In polymer extrusion, compounding is a continuous mixing process that is also used to produce highly reactive powder coatings. A premixed batch of powder coating is added to the feeding section and extruded, preferably by a co-rotating twin-screw extruder. One essential parameter in the processing of highly reactive materials is the melt temperature: If it is too high, pre-reactions occur during the extrusion process, which may cause high rejection rates. We studied the melt temperature of an epoxy/carboxyl-based powder coating using a retractable thermocouple at 3 different axial positions along the barrel of a ZSK34 co-rotating twin-screw extruder. The influence of different processing conditions on the reactivity of a highly reactive powder coating was examined by infrared spectroscopy and differential scanning calorimetry. Furthermore, the specific energy input and the color change in the finished powder coating at different processing points were investigated. Multivariate data analysis was used to correlate mid-infrared spectra, melt temperatures, specific energy inputs, enthalpies of reaction and changes in color.
| Original language | English |
|---|---|
| Pages (from-to) | 31-39 |
| Number of pages | 9 |
| Journal | Journal of Coating Science and Technology |
| Issue number | 4 |
| Publication status | Published - Oct 2017 |
Fields of science
- 205 Materials Engineering
- 205011 Polymer engineering
- 102009 Computer simulation
- 102033 Data mining
- 104018 Polymer chemistry
- 205012 Polymer processing
- 104019 Polymer sciences
JKU Focus areas
- Engineering and Natural Sciences (in general)