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Aging of waterborne paint based on acrylic resin emulsion and organic pigment

The obtained results showed that both of paint-formula coatings had no cracks, blisters, flacks and there was no change of adhesion during the aging process. However, IR analysis indicated that there were some changes in chemical structures of coating with and without Green Luconyl during aging process. | Vietnam Journal of Science and Technology 56 (3B) (2018) 126-136 AGING OF WATERBORNE PAINT BASED ON ACRYLIC RESIN EMULSION AND ORGANIC PIGMENT Dao Phi Hung, Nguyen Anh Hiep*, Mac Van Phuc, Trinh Van Thanh, Nguyen Thien Vuong, Do Minh Thanh Institute for Tropical Technology, VAST, A13 Building, 18 Hoang Quoc Viet, Cau Giay, Ha Noi * Email: nahiep@itt.vast.vn Received: 9 July 2018; Accepted for publication: 8 September 2018 ABSTRACT Aging of waterborne paint on the base of acrylic resin emulsion with and without green Luconyl has been investigated by general appearance assessment, adhesion change, FT-IR and discoloration. The obtained results showed that both of paint-formula coatings had no cracks, blisters, flacks and there was no change of adhesion during the aging process. However, IR analysis indicated that there were some changes in chemical structures of coating with and without Green Luconyl during aging process. To be more specific, IR spectrums of initial and aged coating no containing Green Luconyl illustrated aging process led content of O-H and C=C increased significantly but the baseline of spectra was fairly unchanged. For the Green Luconylfilled coating, the baseline of initial coating’s IR spectra exhibited a reduction than that of aged coating while both of coatings (before and after aging) exhibited spectra of similar shape. Moreover, SEM images indicated that the surface morphology of samples changed differently depending on the presence of organic pigment. The surface of aged coating without Luconyl looked rougher than the one with Luconyl after aging process. Hence, the weather aging test had a more significant influence on paint coatings in absence of Luconyl than paint coating in presence of Luconyl. It was explained that the macroradical produced in aging process would attack conjugated double bonds of Luconyl instead of double bonds of AC-261causingthe aged Luconylcoatingto become more opaque than initial while coating unfilled Luconyl .