Synthesis and characterization of novel alkyd–silicone hyperbranched nanoresins with high solid contents

Hyperbranched alkyd–silicone nanoresins (ASiHBRs) with high solid content were synthesized by etherification reaction between a hyperbranched alkyd resin (HABR) and Z-6018 silicone. ASiHBRs were characterized by nuclear magnetic resonance (NMR), gel permeation chromatography (GPC) and several other techniques. NMR spectra show the presence of aromatic rings, –Si–O and –C–O; grafting was successful. The molar masses of ASiHBRs determined by GPC are higher than that of HABR. The hydroxyl values decrease with increasing silicone content. ASiHBRs have low viscosities what allows easier film formation. Hydrodynamic dimensions, refractive indices, glass transition temperatures, gloss and hardness of ASiHBRs increase with increasing silicone contents. Low contents of volatile organic compounds provide more environmentally friendly coatings.

We have obtained resins with high stability over a range of shear rates and also with viscosities which hardly change with time. Coatings based on these resins show good adhesion to substrates, high gloss and satisfactory hardness.Figure optionsDownload as PowerPoint slideHighlights
► Hyperbranched alkyd–silicone nanoresins (ASiHBRs) with high solid content were synthesized by etherification reaction between a hyperbranched alkyd resin (HABR) and Z-6018 silicone.
► ASiHBRs were characterized by nuclear magnetic resonance (NMR), gel permeation chromatography (GPC) and several other techniques.
► NMR spectra show the presence of aromatic rings, –Si–O and –C–O; grafting was successful.
► The molar masses of ASiHBRs determined by GPC are higher than that of HABR.
► The hydroxyl values decrease with increasing silicone content.
► ASiHBRs have low viscosities what allows easier film formation.
► Hydrodynamic dimensions, refractive indices, glass transition temperatures, gloss and hardness of ASiHBRs increase with increasing silicone contents.