Phthalocyanine green aluminum pigment prepared by inorganic acid radical/radical polymerization for waterborne textile applications

Benjamin Tawiah,Benjamin K Asinyo,Liping Zhang,William Badoe,Shaohai Fu

doi:10.1007/s40090-016-0084-x

Abstract

Polymer-encapsulated phthalocyanine green aluminum pigment was prepared via inorganic acid radical/radical polymerization route, and its properties were investigated by FT-IR, TGA, XPS, SEM, and TEM. SEM and TEM images showed that the aluminum pigment was encapsulated by a thin film of polymer which ensured good anti-corrosive performance in alkaline (pH 12) and acidic (pH 1) mediums. XPS results showed significant chemical shifts, and increase in binding energies to higher levels after raw aluminum pigment was phosphate coated and colored by phthalocyanine green pigment. TGA results suggest a marginal reduction in its thermal stability. Major absorbance peaks, such as aluminum phosphate (AlPO4), different monomer units and CH2 stretching vibration of phthalocyanine green G were highlighted in the FTIR spectra of the colored aluminum matrix. The polymer-encapsulated aluminum pigment (PAP) had excellent UPF properties regardless of the coating thickness, but the handle of the fabric was affected when the coating thickness increased beyond 0.04 mm. The prepared pigment showed excellent rubbing and washing fastness, but its handle and color strength were compromised when the content of monomer ratio by 100 % weight of PGAP increased beyond 10 %, was applied on cotton fabrics. This research provides a simple but effective route for the preparation of polymer-encapsulated aluminum pigments for waterborne textile applications.

Highlights

Colored aluminum pigments having colorful pigment adhered closely, uniformly and firmly on its surface are suitably used in paints, automotive metallic finish, printing inks, molded resins and in decoration finish of plastics [1,2,3]
Polymer-encapsulated phthalocyanine green aluminum pigment was prepared via inorganic acid radical/ radical polymerization route, and its properties were investigated by FT-IR, TGA, X-ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM), and Transmission electron microscopy (TEM)
This reaction created a unique compound between the aluminum phosphate and the modified phthalocyanine green pigment leading to the formation of colored aluminum pigment as shown in scheme 1

Summary

Introduction

Colored aluminum pigments having colorful pigment adhered closely, uniformly and firmly on its surface are suitably used in paints, automotive metallic finish, printing inks, molded resins and in decoration finish of plastics [1,2,3]. Other researchers have suggested a route where silica is coated onto aluminum pigment using sol-gel method followed by color deposition with the aid of surface modification agents [9, 10], but the issue of corrosion and color deformation still persisted after a long exposure to high alkaline waterborne systems. The application of inorganic radical/radical polymerization for coloring silver white aluminum pigment with phthalocyanine green G has not been reported. The phthalocyanine green G colored aluminum pigment was coated with a polymer using radical polymerization, and its properties were investigated. The application of both techniques overcome the limitations of classical polymerization and corrosion inhibition methods and provides an efficient route for preparing colored aluminum pigment having excellent properties.

Results and discussion

Conclusion

Compliance with ethical standards