High-solids nonaqueous dispersion coatings based on crystalline oligoesters / Ganghui Teng in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 829 (02/1994)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 829 (02/1994) . - p. 31-37 Titre : High-solids nonaqueous dispersion coatings based on crystalline oligoesters Type de document : texte imprimé Auteurs : Ganghui Teng, Auteur ; Frank N. Jones, Auteur Année de publication : 1994 Article en page(s) : p. 31-37 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dispersions et suspensions Formulation (Génie chimique) Haut extrait sec Liants Oligomères Polyesters Polymères cristallins Revêtements Rhéologie Vernis Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Nonaqueous dispersions (NADs) of a crystalline oligoester diol were prepared by crystallization in a medium consisting of amorphous diol, reactive diluent (RD), and a solvent. The crystalline diol (6GT) was prepared from terephthalic acid and 1,6-hexanediol; RD was prepared from terephthalic acid and glycidyl neodecanoate. The dispersions are opaque, thixotropic liquids with low viscosities at solids of 60-70 wt%. X-ray and calorimetry studies show that the dispersed particles are crystalline. Microscopy shows that they have a narrow distribution of diameters, varying from 5 to 20 μm depending on process conditions. When formulated with crosslinkers (melamine or isocyanate resins) and baked at temperatures above the melting point of the crystalline diol, these NADs gave transparent coatings. Glossly pigmented coatings were also prepared. As high-solids coatings, these materials provide excellent application properties (resistance to sagging) and a good balance of film physical properties. While some of the formulated coatings stratify on standing, they can be restored to homogeneous, free-flowing liquids by stirring gently. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of 6GT,6GCH and DED - Synthesis of reactive diluent (RD) - Preparation of nonaqueous dispersions and unpigmented coatings - Preparation of pigmented NAD coatings - Preparation of clear coatings based on 6GCH and DED - Film formation and testing - Instrumental methods - RESULTS AND DISCUSSION : Syntheses of 6GT, 6GCH, and RD - Preparation and stability of nonaqueous dispersions - Particle size and morphology - Factors governing formation and stability of NADs - Film formation and film properties of NAD coatings - Application characteristics of NAD coatings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18586 [article]

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