Preparation and Properties of Waterborne Epoxy Resin Nano-SiO2-composite Coating Using in Food Metal Packaging
The epoxy coatings for food in the coating of metal packaging were modified.The epoxy resins were modified by chemical grafting modification method to make it water-based.Different proportions of nano-SiO2 were added to prepare compostie coatings.The optimal conditions for preparing a nanocomposite modified water-based epoxy coating were ascertained by orthogonal test and single factor experiment.The prepared nanocomposite-modified waterborne epoxy coating has good comprehensive properties when the dosage of curing agent 1,2-ethylenediamine is 10％, methacrylic acid (MAA) 4％, benzoyl peroxide (BPO) 2％, SiO2 8％ under 50 ℃ and reaction time of 40 min.Furthermore, the samples were characterized by infrared spectroscopy, scanning electron microscope and a variety of national standards.Results showed that the prepared composite coating has good water resistance, acid and alkali resistance, and the anticorrosion performance.Its impact strength is 45 kg·cm and adhesion strength is 0 grade.
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