[article]
| Titre : |
Novel synthesis of carboxy - functional soybean acrylic - alkyd resins for water - reducible coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Changchun Wang, Auteur ; Geng Lin, Auteur ; Joon-Hwan Pae, Auteur ; Frank N. Jones, Auteur |
| Année de publication : |
2000 |
| Article en page(s) : |
p. 55-61 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Tags : |
Alkyde résine Acrylate copolymère Matériau revêtement Préparation Polycondensation Huile soja Méthacrylique acide Acrylique Polyélectrolyte Relation composition propriété Stabilité chimique Hydrolyse stockage Utilisation Peinture eau Etude expérimentale |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
A new process was developed for synthesis of alkyd resins in which a conventional monoglyceride is reacted with a carboxy-functional acrylic ceride is reacted with a carboxy-functional acrylic copolymer. The novel products are called acrylic-alkyd resins. The carboxy-functional acrylic copolymers were synthesized by solution-free radical polymerization. Gelation during alkyd resin synthesis was avoided by; (1) limiting the molecular weight of the acrylic copolymers to Mn 3500-5000 and (2) limiting the number average functionality about 6.5-10 carboxyl groups per molecule. Further, the carboxyl groups were derived from a mixture of acrylic and methacrylic acids (1/1.2 mol ratio) in the expectation that this would help control the process. Three series of acrylic copolymers were prepared from various combinations of acrylic monomers and reacted with a monoglyceride prepared from soybean oil and trimethylol propane. The composition of the acrylic resin was adjusted to minimize phase separation [observed visually and by scanning probe microscopy (SPM)] within cast films. The most satisfactory results were obtained with copolymers of 62-71 wt% of methyl methacrylate, 5-21 wt% of lauryl methacrylate, 7.2 wt% of acrylic acid, and 10.3 wt% of methacrylic acid, In preliminary tests, waterborne coatings made from acrylic-alkyd resins based on these acrylics had excellent stability, with acid numbers changing less than 10% after nine months of storage. |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5807 |
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 904 (05/2000) . - p. 55-61
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Novel synthesis of carboxy - functional soybean acrylic - alkyd resins for water - reducible coatings in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 904 (05/2000)
