Lighter together / Manfred Bär in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 2 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 2 (2022) . - p. 32-34 Titre : Lighter together : Blends of PP and PA reduce weight and improve chemical resistance Type de document : texte imprimé Auteurs : Manfred Bär, Auteur Année de publication : 2022 Article en page(s) : p. 32-34 Langues : Anglais (eng) Catégories : Alliages polymères Composites à fibres de verre Matériaux -- Allègement Matières plastiques dans les automobiles Polyamides Un polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine. Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères. Polypropylène Résistance chimique Index. décimale : 668.4 Plastiques, vinyles Résumé : Vehicle weight reduction requirements today pose great challenges not only to automotive manufacturers and suppliers but also to material producers. The materials used must cut weight while at the same time withstanding the mechanical and chemical stresses encountered in service. This can be achieved, for example, with blends of polyamide and polypropylene. These blends also offer other useful advantages. Note de contenu : - Stable compound obtained by grafting and special compounding technology - Up to 10 % lower density - Practical experience demonstrates success - Twice as sustainable - Fig. 1. Depending on the grade, PA6+PP blends with 30 % glass fiber reinforcement have a 7 to 10 % lower density than pure PA6 with the same glass fiber reinforcement. Although the density of PP-GF30 is even lower, this material does not usually fulfill the necessary technical requirements - Fig. 2. The effect of conditioning upon tensile strength is less with the PA+PP blends than with PA6 - Fig. 3. Due to the PP content of the blends, their heat deflection temperature is sometimes lower than that of pure PA. However, the difference is minimal and so they are still suitable for heat-stressed components - Fig. 4. Test bars after contact with a calcium chloride solution. The grey points indicate degradation. The bars made from the PA+PP blends show basically no degradation, unlike those made from PA - Fig. 5. With these blends, it is possible to produce compactly designed fan shrouds that are even lighter than those made by foam injection molding with pure PA66 for example - Fig. 6. Relative reduction of the carbon footprint by replacing conventional PA6 compounds with Akromid-Lite compounds : depending on the material, savings of up to 25 % are possible En ligne : https://drive.google.com/file/d/1BRvrtOlQKsbiV0ZcVkjUt6jgkNZipFbf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37305 [article]

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