Preparation of the Yellow-Colored Aluminum Pigments with Double-Layer Structure Using a Crosslinked Copolymeric Dye.

Zhicheng Wang,Shuping Nie,Peng Chen,Zhengzhi Zheng,Qiannian Dong,Jibin Miao,Lifen Su,Jiasheng Qian,Ru Xia,Ming Cao,Bin Yang,Yang Lv,Ming Chen

doi:10.3390/polym10101097

Abstract

Colorization for fabricating aluminum pigments has broad application prospects in recent years. In this study, yellow-colored aluminum pigments with the double-layer structure Al@SiO2@PFMV were prepared using a sol-gel method. A crosslinked copolymeric dye (PFMV) was firstly synthesized by radical polymerization using vinyl triethoxysilane (VTES) and a small molecular dye (FGMAC) as monomers. Then, colored aluminum pigments were prepared by hydrolysis and condensation of the copolymers on the surface of aluminum pigments. SEM, AFM, FTIR, and XPS were used to characterize the surface morphology and chemical structure of the colored aluminum pigments. It was found that the colored aluminum pigments have a heterogeneous and smooth surface layer. The anticorrosion results showed that the colored aluminum pigments had better chemical stability with significantly improving corrosion resistance compared to raw aluminum pigments and Al@SiO2 with the single-layer coating. Chromatism analysis indicated that the lightness of Al@SiO2@PFMV pigments decreased slightly and the color changed from silver-gray to yellow.

Highlights

Aluminum pigments, a kind of ultrathin flaky aluminum powders, have been widely used in printing, painting and coating industry owing to their excellent metallic luster, covering capability, and “flip-flop” effect [1,2,3,4]
Colored aluminum pigments with the double-layer structure Al@SiO2 @PFMV were prepared by a two-step process
PFMV was synthesized by radical copolymerization using vinyl triethoxysilane (VTES) and FGMAC as monomers; the products could be separated by precipitation in ethyl ether, obtained in 83% yield

Summary

Introduction

A kind of ultrathin flaky aluminum powders, have been widely used in printing, painting and coating industry owing to their excellent metallic luster, covering capability, and “flip-flop” effect [1,2,3,4]. It is necessary to develop a method for improving the corrosion resistance of aluminum pigments on the surface. Among various kinds of improving the anticorrosion properties of aluminum pigments, one method is to use anticorrosion inhibitor with special functional groups, which can adsorb on the surface of aluminum pigments, such as citric acid, aminophenols, vanillin, and so on [9,10,11,12]. Compared with adsorption of anticorrosion inhibitor, the other promising method is forming an inorganic layer or organic layer on the surface of aluminum pigments. Kiehl firstly proposed the inorganic SiO2 encapsulation of aluminum pigments using tetraethoxysilane (TEOS) as a precursor with a sol-gel method [13]. Zhang et al reported a coated aluminum pigments with TEOS

Methods

Results

Conclusion