Synthesis and Characterization of Allyl Fatty Acid Derivatives as Reactive Coalescing Agents for Latexes |
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Authors: | Joana V Barbosa Fernanda Oliveira Jorge Moniz Fern?o D Magalh?es Margarida M S M Bastos |
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Affiliation: | 1. LEPAE, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal 2. CIN, Corpora??o Industrial do Norte, S.A., Estrada Nacional 13 (km 6), Apartado 1008, 4471-909, Maia, Portugal 3. Resiquímica, Resinas Químicas, S.A., Rua Francisco Lyon de Castro, 28, 2725-397, Mem Martins, Lisbon, Portugal
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Abstract: | This work evaluated the use of allyl fatty acid esters derived from vegetable oil (palmitic acid, soybean and sunflower oils) as reactive coalescing agents in a waterborne latex system. Allyl fatty acid derivatives (AFAD) from vegetable oils were synthesized by two different processes. The synthesis was monitored by IR-spectroscopy and the final product characterized by FT-IR, GC–MS, 1H and 13C NMR. The presence of conjugated double bonds in the aliphatic chain was confirmed, which is a determinant for the proposed autoxidative latexes drying mechanism. Each of the AFAD were subsequently added to a standard acrylic emulsion, in order to study its potential as reactive coalescing agent. The minimum film-forming temperature (MFT), glass transition temperature (T g), drying time and rubbing resistance to solvents were evaluated. The results showed that, when added to water-borne acrylic resins, an AFAD acts as a non-volatile plasticizer capable of autoxidative crosslinking with itself. |
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