Nos Abonnements
Ressources Électroniques
Compound of nickel phosphate with Ni(OH)(PO4)2― layers and synergistic application with intumescent flame retardants in thermoplastic polyurethane elastomer in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011)
Compound of nickel phosphate with Ni(OH)(PO4)2― layers and synergistic application with intumescent flame retardants in thermoplastic polyurethane elastomer [texte imprimé] / Xueying Shan, Auteur ; Ping Zhang, Auteur ; Lei Song, Auteur . - 2011 . - pp. 7201-7209.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7201-7209
Mots-clés : Flame retardant Synergism Résumé : In this paper, a new method was used to prepare flame retardant thermoplastic polyurethane elastomer (TPU). Nickel phosphate with Ni(OH)(PO4)2― layers, Na(H3O)2{Ni4(OH)4(HPO4)3(H2PO4)} (NaNiP), was prepared by a hydrothermal method, and it was added to the TPU and intumescent flame retardant (IFR) system. The synergistic effect between NaNiP and IFR was studied. With the addition of 1 wt % NaNiP, the limiting oxygen index (LOI) value of the TPU/ IFR system was increased from 27 to 32%. The UL-94 tests showed that TPU containing 20 wt % IFR had no rating, but TPU with 19 wt % IFR and 1 wt % NaNiP could reach the V-0 rating. The results of thermogravimetric analysis/infrared spectrometry (TGA―IR) showed that NaNiP could delay volatilized products in TPU/IFR system. Laser Raman spectroscopy (LRS) of residual char indicated that the ordered carbon was increased with the addition of 1 wt % NaNiP, and the content ratio of ordered carbon in outer char was larger than that in inner char. Scanning electron microscopy (SEM) indicated that NaNiP could help the TPU/IFR system form a dense and intumescent char layer. Therefore, a just-right formulation between IFR and NaNiP in TPU showed optimal synergistic effect. The synergistic mechanism was also proposed in this paper. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239034
