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20. October 2020

The new issue 5/2020 of PU Magazine International has been published!

Occupational health and safety has long been an important topic in the PU industry. In the latest issue we report on Tank Farm Assessments (TFA), which have been developed for the polyurethane industry as part of a best-practice program by Isopa. Covestro offers this service to its customers, and we spoke to Thomas Gross (Covestro) and Eroll Shabi from Ventius International about their experiences.

In addition, we spoke with Holger Klyszc-Nasko from Acmos Chemie about the history of the company and how Acmos is positioned in the field of sustainability and circular economy.

Also, the company Fecken-Kirfel celebrates its 150th anniversary this year. On this occasion we spoke with the two managing directors Norbert Leyens and Volker Schiffer about the company's recipe for success and plans for the future.

Further highlights are:

  • The 30th International Colloquium Plastics Technology of the Institute of Plastics Processing (IKV) in Industry and Trade at the RWTH Aachen University.
  • The double online event Foam Expo Connect and Adhesive & Bonding Expo Connect
  • and many other topics

Featured technical articles are:

  • Fundamental polyurethanes foam flow simulations using bubble nucleation and growth models
    (J. Claracq, P. Gillis, I. Khan, C.-W. Tsang, Q. Yuan, Dow)
    Several computational tools exist which can simulate the filling of molds with physically and/or chemically blown polyurethane foams. Many of these tools utilize foam expansion relationships based on experimental data, such as Foamat runs. A fundamental foam model has been developed inside Dow that includes multiphase flow physics, kinetic models for gelling and blowing reactions as well as nucleation and bubble growth relationships to characterize the cell structure within the foam. Greater computational flexibility and increased formulation optimization is achieved through severing the restriction for the model to solely rely on experimental foam rise data. The capabilities of this foam flow tool will be demonstrated and compared against data for several formulations and mold geometries.
  • Novel anti-scorch package for polyol and PU foams significantly reducing emissions in automotive interior
    (C. Tartarini, N. Cliff, J. Yuan, BASF)
    From furniture and bedding to automotive and sport applications, consumer expectations for both quality and performance are constantly increasing. These expectations also now include environmentally-friendly, health-conscious, and sustainable product solutions. Subsequently, the attention to final article volatile component emission has greatly increased. As leaders in this push for environmental and health awareness, automotive OEMs have been setting stringent material and final article emissions requirements, raising the standard to new levels to enhance vehicle interior air quality (VIAQ). Anti-scorch packages prevent degradation of polyol / PU foams, helping to prevent formation of volatile side products that contribute to emissions, including aldehydes. Among anti-scorch systems, non-amine packages are well received not only because of their zero contribution to amine emissions but also due to their ability to confer to foams improved gas fading resistance and low light-induced discoloration, leading to high-quality foams. This paper will illustrate the novel anti-scorch system Irgastab PUR 70. It provides protection against scorch and formation of volatile degradation products, leading to extremely low emissions – VOC, FOG and aldehydes. Its thermal permanence also leads to extremely low FOG contribution. This enables foam formulations and manufacturers to meet the most stringent emission specifications set by the automotive industry and regulatory bodies, to support the VIAQ targeted improvements and to reach aggressive global sustainability goals.
  • Mechanical performance of novel polyisobutylene-based elastomeric polyurethanes before and after hydrolysis
    (J.
    E. Puskas, J. Kantor, E. A. Collister, M. P. Mallamaci, V. C. Comes (University of Akron, Parker Hannifin Corporation)
    The mechanical performance of thermoplastic elastomeric polyurethanes (PUs) before and after hydrolysis is investigated. These new PUs were prepared with a new asymmetric polyisobutylene-diol (PIB-diol), without the use of solvents, and with short reaction times. The PUs were made with dicyclohexylmethane 4,4'-diisocyanate and 1,4-butanediol in the hard segments and poly(hexamethylene carbonate) (PC)-diol and polyisobutylene (PIB)-diol in the soft segments. The functionality of PIB-diol was verified by mass spectrometry. Optimum solventless synthesis conditions and performance were found with a mixture of 50/50 PIB-diol/PC-diol (28.9 wt% PIB in the PU). This PU had 26.03 ± 1.19 MPa tensile strength with 286.92 ± 12.17 % elongation before and 16.22 ± 0.65 with 301.17 ± 15.08 % elongation after American Society for Testing and Materials (ASTM) hydrolytic stability testing. Importantly, after the hydrolytic stability testing, the stress-strain plot of this PIB-PU was similar to that of the control PC-PU. The PU with 70/30 PIB-diol/PC-diol (41.2 wt% PIB in the PU) performed slightly better but needed solvent during synthesis because of the high viscosity of the mixtures.

Further information about the new issue at https://www.gupta-verlag.com/magazines/pu-magazine-international/05-2020.

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