Extending the limits of PVC / Wenke Wollny in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 1 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 1 (2022) . - p. 60-63 Titre : Extending the limits of PVC : Co-extrusion of PVC with modified PBT blend improves profile mechanics Type de document : texte imprimé Auteurs : Wenke Wollny, Auteur ; Norbert Effen, Auteur ; Kay Brockmüller, Auteur Année de publication : 2022 Article en page(s) : p. 60-63 Langues : Anglais (eng) Catégories : Alliages polymères Chlorure de polyvinyle Matières plastiques -- Extrusion Polybutylène téréphtalate Profilés Index. décimale : 668.4 Plastiques, vinyles Résumé : Profiles made of rigid PVC have many advantages: they are easily extrudable, inexpensive, and with suitable additives, they exhibit good UV resistance. However, regarding its mechanical and thermal properties, PVC occasionally reaches its limits. This shortcoming can be evaded by co-extrusion with a PBT blend. Note de contenu : - Customized melting point plus high stiffness - PBT bears the main load - Processing with single-screw or twin-screw extruders ? - Important processing parameters - Fast and safe way to a good mold - Weldability of co-extruded profiles ensured - Recycling : easy separation of pvc and pbt - Fig. 1 : Permanent post-shrinkage of profiles made of rigid PVC and the PBT Ultradur from BASF, as well as hybrid profiles of PVC and PBT after heating to a certain temperature: shrinkage of hybrid profiles is significantly lower than with pure PVC profiles. On average, the measured hybrid profiles contain about 18 % PBT - Fig. 2 : This co-extruded profile replaces a steel profile in certain window frames. The lower thermal conductance increases the energy efficiency - Fig. 3 : Ultradur B4040 G11 HMG HP can be used instead of steel to stiffen rigid PVC profiles. The result is a lower permanent deflection after one-sided heating. Moreover, thermal conductance is reduced. This permits large, energy-saving windows, also with dark-colored profiles - Fig. 4 : Door profile of a chest freezer: hereby, Ultradur replaces a metal stiffener, which eliminates the need for an electrical heater in the profile to prevent condensate formation on the outer surface. This improves the freezer’s energy efficiency - Table 1 : Permanent post-shrinkage of profiles made of rigid PVC and the PBT Ultradur from BASF, as well as hybrid profiles of PVC and PBT after heating to a certain temperature : shrinkage of hybrid profiles is significantly lower than with pure PVC profiles. On average, the measured hybrid profiles contain about 18 % PBT En ligne : https://drive.google.com/file/d/1IiKupVLm1lGQpCF2HLjWRARnhd9FSYpi/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37212 [article]

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