The April issue of PU Magazine is out now!
Enjoy reading our technical articles
Dr. Srikanth Pilla and Dr. James Sternberg, Clemson University
Closing the circle. A 100 % plant-based non-isocyanate polyurethane foam capable of chemical recycling
Bio-based solutions to polyurethanes have largely focused on replacing the polyol portion of the reaction mixture so far. Replacing the isocyanate portion is much harder since tried and true reagents are very reactive and allow for the foaming and curing reaction of PUs to occur on industrial timescales. In addition to the issue of toxicity, PUs are also some of the least recycled plastics produced. The crosslinked nature of many PUs precludes the ability to reprocess the material at its end of life. While there are some examples of physical recycling, the large scale conversion of waste PUs to high value products has not met with commercial success. The research presented here aimed to address the overarching issues related to the lifecycle of PUs by enabling a non-toxic, bio-based and recyclable PU that could be marketed for high value applications.
Dr. Matthias Hübner, Caparol
Tailored colour masterbatches for high-quality TPE tints .Applications and benefits of Caparol NEFA MB masterbatches for thermoplastic elastomers – part 2
Dispersive and distributive mixing processes are major elements in the manufacture of thermoplastic masterbatches and compounds. Continuously working twin-screw extruders and kneader systems are mainly used for compounding. A crucial restriction of these mixing devices is the limited dwell time of the components to be mixed. Caparol Industrial Solutions GmbH is a company that has specialised in the manufacture of primarily liquid and paste-form pigment and additive concentrates. Discontinuously working mixing and dispersion machines, such as roller mills, bead mills or dissolvers are used in particular in the production of these concentrates. This is where the compounds and masterbatches of the NEFA MB product group come into play. The combination of discontinuous mixers and twin-screw extruders can manufacture very highly filled, specialist products on the basis of special thermoplastic elastomers. In the area of colour masterbatches, NEFA MB concentrates stand out because of their very high pigment fill levels. The manufacturing process employed makes the use of dispersion agents completely unnecessary. This can be an advantage for TPE tints in particular, since dispersion agents may lead to film formation on the component surface in some cases. Because of the colour intensity of the NEFA MB masterbatches, even TPEs with a strong colour of their own due to fillers, for example, can be tinted brilliantly with comparatively low quantities of masterbatches.
- Aster de Schrijver, Greenseal, reports about non-isocyanate curing OCF formulations, which do not contain free monomeric MDI.
- New market study from IAL Consultants. Global overview of the SPF and OCF markets
- The flexible foam industry in Turkey
- CO2 as chemical feedstock for polymers
- Turning waste gas into a valuable material. Covestro is using CO2 for plastics production
- Interview with Christoph Hauck, new managing director of Bäumer
- Porex introduces sustainable product development capabilities
- Bio-based healable non-isocyanate polyurethanes
- The power of polyurethanes in shaping the future. From Dow’s virtual event
- ebalta, a carbon neutral company
Further information about the new issue at https://www.gupta-verlag.com/magazines/pu-magazine-international/02-2021.