Novel waterborne hyperbranched acrylated-maleinized alkyd resins synthesised
Wednesday, 26 October 2011
Researchers from Colombia developed resins with good filmproperties. The resins exhibited hydrolytic stability and pseudoplastic rheological behavior.
Novel waterborne hyperbranched acrylated-maleinised alkyd resins synthesised Source: Evonik Industries
Edwin Murilloa and Betty Lopez from University of Antioquia, Colombia, synthesised different waterborne hyperbranched acrylated-maleinized alkyd resins (HBRAAM). They modifyed a hyperbranched alkyd resin (HBRA) with three different butylmethacrylatemaleic anhydride copolymers (BMAMA) in the presence of p-toluenesulfonic acid (PTSA). The HBRAAM resins were characterised by using infrared analysis, iodine value, hydroxyl value, vapor pressure osmometry (VPO), dynamic light scattering (DLS), acid value, rheological analysis, differential scanning calorimetry, adhesion, flexibility, drying time, gloss, hardness and chemical resistance to solvents. The iodine value and hydroxyl value decreased with the amount of BMAMA copolymer employed in the synthesis. Infrared analysis, VPO, and hydroxyl values allowed the researchers to conclude that the reaction between HBRA resins and BMAMA copolymers occurred. The viscosity of the HBRAAM resins was between 50.5 and 468 Pa s. All HBRAAM resins presented good properties of adhesion, flexibility, drying time, gloss, hardness and chemical resistance. For further information contact Edwin Murillo: edwinalbertomurillo@gmail.com
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