Preparation of Water-Based Alkyd/Acrylic Hybrid Resins

A ‎ lkyd resins are amongst the most ‎important and widely used resins ‎in coating sectors. In this ‎communication we report on ‎preparation of alkyd resins ‎emulsified by grafted acrylic resins ‎on their fatty acid moieties. Both ‎high-shear mechanical ‎homogenizer and ultra-sonic ‎sonicator were used step-wise to ‎disperse the alkyd resin and ‎acrylic based monomers in ‎aqueous media. The resins are of ‎nanometric particle size (~200nm) ‎dispersed in water in the presence ‎of polymerization emulsifying ‎agent. The FT-IR spectroscopy ‎revealed the differences in the ‎spectrum of the base resins and ‎hybrid resin. The extraction test ‎revealed formation of better than ‎‎99% of grafted hybrid resin. The ‎DSC test showed that the glass-‎transition temperatures of the ‎hybrid resin are very lower than ‎that of the base alkyd and acrylic ‎polymers which re-confirm ‎formation of chemically grafted ‎hybrid resin. The molecular weight ‎of the hybrid resin was also found ‎to be a combination of those of the ‎base resins. The polydispersity of ‎the base resins is about 8, whereas ‎that of the hybrid resin locates ‎around 32 which is resulted from ‎differences in the molecular weight ‎of the base resins. The films of the ‎resulting resins were fully dried ‎after 8 hours at room temperature ‎without any further loss in weight ‎or tackiness. ‎