The new issue 4/2020 of PU Magazine International has been published!
In this issue we report on
- Alliance for Flexible Polyurethane Foam study on consumer preference for mattresses with CertiPUR-US-certified foam.
- Renuva Mattress Recycling Project by Dow
- First long wind turbine blades that are made entirely of PU (Covestro)
- Processing additives for polyurethane applications (Repi)
We also present a brief preview of Foam Expo Connect and Adhesive & Bonding Expo, which will run from 24-28 August as a web-only show and conference.
Our featured technical articles are on polyurethane with unique polyols based on branched and long chain diols (Kuraray); soft dielectric elastomers (BASF); EU and circular economy (nova-Institute); and CO2 polyols for rigid spray foam (Econic).
This issue also contains the second part of the two-part series on the use and recycling of plastics by PU and recycling expert Bernhard W. Naber.
Featured technical articles are:
- Polyurethane with unique polyols based on branched and long chain diols, 3-methyl-1,5-pentanediol and 1,9-nonanediol
(K. Senda, K. Mayahara, K. Inoue, D. Kinderf, Kuraray)
It is possible to achieve desired physical properties by improving the primary structure of polyurethane raw materials to enhance the function of the polyurethane. In this study polyester polyols and polycarbonate diols were synthesized using a diol with a branched structure or a straight long carbon chain as a raw material, and the physical properties of these polyols were checked. Further, polyurethanes were synthesized using these polyols as a raw material, and the physical properties of these polyurethanes were checked. Polyester polyol-based polyurethane resins generally have a high durability, but have a problem with water resistance and flexibility. The introduction of polyester polyols and polycarbonate polyols with a branched structure or a straight long carbon chain improves water resistance, which is a weak point of polyester polyol-based polyurethanes in general, and provides flexibility equal to or greater than that of polyether polyol-based polyurethane, while high durability is maintained. The use of the diols presented in this paper enables the production of polyols and polyurethanes with excellent physical properties.
- Soft dielectric elastomers
(F. Bokel, BASF)
Thermoplastic elastomers (TPE) are a promising class of materials for dielectric elastomer applications and have excellent processability and recyclability. These materials encompass a wide range of polymeric families including thermoplastic-based polyolefins (TPO), polystyrenes (TPS), amides (TPA), copolyesters (TPC), and vulcanizates (TPV). They have a broad range of operating temperature and can often replace conventional crosslinked rubber for applications falling in this range. Service or operating temperatures can range from very cold to very warm conditions, making TPEs suitable for the demands of outdoor applications or exposure to frequent fluctuations in temperature. Furthermore, good flexibility and mechanical properties allow for large reversible deformations and creep-resistant behavior.
- The EU circular economy package and plastics strategy. An overview and what they mean for bio-based plastics.
(L. Dammer, M. Carus, nova-Institute)
Very few policy initiatives in the last few years have received as much public attention as the recently adopted Single-Use Plastics Directive – also known as the single-use plastics ban. This legal act, however, is only one piece of the puzzle with which the European Union is attempting to curb plastic littering and transform the European economy into a circular one. The following article gives an overview on the EU circular economy package and plastics strategy and explains what they mean for bio-based plastics.
- Performance advantages of rigid spray foam for insulation produced with polycarbonate ether polyols
(M. Andrews, L. Taylor, S. Tickle, M. Kember, E. Lancaster, Econic)
The use of carbon dioxide as a feedstock to produce polycarbonate ether (PCE) polyols used in the manufacture of polyurethane is one of the few commercially and technically viable opportunities for utilization of this waste gas. Novel catalyst technology developed by Econic has the capability to use CO2 as a feedstock for such polyols. In addition, the low pressure requirement for operation of the technology allows for potential retrofit to existing polyether polyol production assets. Econic's catalyst technology enables the production of a variety of polyols with tailored amounts of CO2 built into the polymer chain. This unique series of polycarbonate ether polyols have improved properties over their wholly polyether counterparts, which offers enhanced applications in a diverse range of markets. The use of low molecular weight polycarbonate ether polyols to produce rigid spray insulation foams will be demonstrated alongside performance benefits generated by the incorporation of carbon dioxide.
- The old Plast and the Sea – part 2. Questions and comments on the use and recycling of plastics
(Bernhard W. Naber)
Today, the utilisation of plastics is mainly perceived as a problem. And indeed, their extensive use is a double-edged sword. On the one hand, we cannot and do not want to do without plastics, because the diversity of polymers and their broad range of properties enable applications where traditional materials fail. In addition to their undeniable benefits in everyday life, they are also the cause and source of a wide range of environmental problems. This article deals with the arguments for and against the extensive use of plastics. Part 1 dealt with the advantages of plastics for our technological society and in general with the possibilities, limits and economic and ecological costs of recycling. In part 2, different groups of plastics are considered individually and examined for their recyclability. Raw material recycling and incineration are also addressed as possible end-of-life solutions.
Further information about the new issue at https://www.gupta-verlag.com/magazines/pu-magazine-international/04-2020.