Aqueous dispersions of nano-scale organic pigments were prepared through ball milling and ultra-sonication in presence of dispersing agents.
The well dispersed pigment was encapsulated intoUV-curable resin via miniemulsion technique.
Effects of molecular structure of organic pigments, typeof dispersing agent and time of ball milling were investigated.
Results showed that C.I. Pigment Green7 had better dispersion stability with time compared with other pigments.
Ultracentrifuge sedimenta-tion test, shelf life stability, thermal gravimetric analysis (TGA) and transmission electron microscope(TEM) provided supporting evidences for the encapsulation of C.I. Pigment Green 7 into polyester tetraacrylate/1,6-hexandiol dimethacrylate.
Zeta potential results proved that UV-curable encapsulation ofC.I. Pigment Green 7 intensifies the charge on the surface of the pigment and significantly increases thedispersion stability.
This method of modifying organic pigments to be used as pigmented UV-curableinkjet inks was found to be durable and effective in preliminary application in inkjet printing of textiles.