Preparation, characterization, and evaluation of new alkyd-vinyl acetate grafted copolymer for water-based coating

Authors

1 Science for Chemicals Co., 10 Al-Tahrir St, Sheraton Buildings, Cairo, Egypt.

2 Chemistry Department, Faculty of Science, Faculty of Science, Al-Azhar University, 11884, Cairo, Egypt

3 Research and Development, Egyptian British Co. for Specialty chemicals & auxiliaries, Giza, Egypt.

Abstract

Alkyd emulsion is one of the solutions to the problem of the legal limit value for volatile organic content (VOC). In the present work, we discuss the synthesis of different grafted alkyd-vinyl acetate copolymers using the emulsion polymerization technique. The prepared polymers were characterized in terms of particle size, FT-IR, differential scanning calorimetry (DSC), and gel permeation chromatography (GPC). The synthesized polymers showed enhancements in nanometric properties (70 nm) as compared with commercial vinyl acetate copolymer resins. The spectra of the blank resins and hybrid resins showed some spectral differences, as shown by FT-IR spectroscopy. The DSC test revealed that the hybrid resin's glass-transition temperatures are lower than those of that based on vinyl acetate copolymer, and the GPC results showed that the average molecular weight (M.wt) of hybrid resin is higher than both vinyl acetate copolymer and alkyd resins, further confirming the chemical formation of hybrid resin. The characterized copolymers were evaluated as binders in water-based coating formulations and showed an increase in wet scrub to 2930 cycles for the hybrid resin, compared to the vinyl acetate copolymer resin of 1600 cycles. These improvements may be one of the most promising opportunities to replace solvent-based alkyd with alkyd-vinyl acetate emulsion in waterborne coating.
Al-Azhar Bulletin of Science
Volume 2024, Issue 1
January and February 2024

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