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Abstract
Waterborne epoxy dispersions have been an active area of research since the early 1980s because of legislative restrictions on the use of organic solvents in conventional solvent‐based products and also because they exhibit almost the same high performance levels as solvent‐borne epoxy. In the present study, first the epoxy‐acrylic graft copolymers (EAG) were synthesized through grafting acrylic monomers onto the epoxy resin, and then EAG were modified by amine‐siloxane through the incorporation of the latter into the former via ring‐opening reaction. The graft copolymers act as an effective compatibilizer between the styrene‐acrylic resin phase and the epoxy matrix, which make the waterborne epoxy dispersions stable. The effects of methacrylic acid (MAA) content, siloxane content, neutralization degree on the particle size and the apparent viscosity of the dispersions were investigated. The structure of EAG, and siloxane‐modified EAG copolymers (EAGS) was confirmed with Fourier transform infrared (FTIR) spectroscopy analyses. The physical properties of the dispersions and the physicochemical properties of the films show the dramatic improvement in properties of waterborne epoxy dispersions due to epoxy‐acrylic‐graft‐copolymer modified by siloxane.
Acknowledgments
This work was financially supported by Science and Technology Research Program (07BQ010), Hubei Provincial Department of Education.
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