Improved water-based coatings based on alkyd and amino resins
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Improved water-based coatings based on alkyd and amino resins – Protecting street art murals from photo-oxidative, thermal and hydrothermal degradation can be difficult depending on the location and substrate. This article describes the development and characterization of the chitosan-nanosilica hybrid coating.
In this study, the curing parameters of the waterborne coating were carefully optimized by using waterborne alkyd resins as matrix resin and fully methyl etherified amino resins as crosslinking agent. An orthogonal experimental design and a controlled experiment were used to determine the optimal conditions, namely a ratio of alkyd resins to amino resins of 7:1 and curing at 403.15 K for 30 minutes. The droplet size distribution and zeta potential measurements confirmed that the composite resin emulsion prepared with the optimal ratio was more uniformly and stably dispersed in water, which helped to optimize the coating and give it excellent physical properties, mechanical stability and chemical durability.
Thermal stability
Thermal stability was also thoroughly evaluated by TGA analysis, with a particular focus on the third degradation stage of the optimized composite resin coating (573.15-733.15 K). The kinetic analysis of the pyrolysis provided deeper insights into its thermal behavior. The activation energies calculated using the KSA and Starink methods showed consistent values of 195.47 kJ/mol and 196.06 kJ/mol, respectively. Furthermore, a reaction mechanism function of G(α) = [-ln(1-α)]3 is obtained via the C-R method, implying a sigmoidal rate equation or stochastic nucleation. The activation energy calculated by this method is 211.10 kJ/mol and the pre-exponential factor is 2.22 × 1016 min-1. Remarkably, the thermodynamic parameters obtained by all three methods show a remarkable similarity.
Source: Progress in Organic Coatings, Volume 199, February 2025, 108943
Reading tip: Additives for water-based coatings
Water-based systems are the coatings of the future. The market is developing an insatiable appetite for ecologically responsible coatings based on renewable raw materials. The demands on coating performance are at least as high as those on environmental friendliness. Additives help to protect the environment by effectively reducing the use of organic solvents. Many of today’s water-based coatings could not be formulated without them. Incorporated into waterborne paints, coatings and inks, they improve both the manufacturing process and the performance of the paints and coating materials used.
“Additives for Waterborne Coatings” is a must-read for formulators who want to refresh their knowledge of waterborne coating systems, as well as for experts who want detailed knowledge at their fingertips.
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Source: European Coatings
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