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Encapsulation of Pigment Red 122 into UV-curable resins via a mini-emulsion technique

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Purpose ‐ The purpose of this paper is to encapsulate aqueous dispersions of nano-scale CI Pigment Red 122 prepared through ball milling into UV-curable resins, 1,6 hexanediol diacrylate (HDDA, monomer), and polyester acrylate (oligomer) using the mini-emulsion technique. Design/methodology/approach ‐ The encapsulation of pigment is achieved by mixing a surfactant-stabilised pigment dispersions and a monomer/oligomer mini-emulsions and subjecting both to mini-emulsification conditions. A film of encapsulated pigment mini-emulsion is finally UV cured using water-soluble initiator. Efficient encapsulation is proven by ultra-centrifugal sedimentation, scanning electron microscopy and thermogravimetric analysis (TGA). The stability of pigment dispersions and also the encapsulation process are investigated. Findings ‐ TGA and ultracentrifuge sedimentation results showed that CI Pigment Red 122 is successfully encapsulated into polyester acrylate/HDDA resins. The oligomer (polyester acrylate) in the presence of organic pigment could stabilise the mini-emulsion droplets without introducing any other hydrophobes (co-stabiliser) in the formulation. In addition, the encapsulation percentage and suspension stability of mini-emulsion are best when the polyester acrylate/HDDA weight ratio is 3:2. Research limitations/implications ‐ The UV-curable resins used in the present context are 1,6 HDDA and polyester acrylate. Besides, various oligomer/monomer composition types could be used and its impact on encapsulation efficiency could be also studied. Practical implications ‐ This method of encapsulation is practically effective for modification of organic pigments for use in UV-curable ink-jet printing inks. Originality/value ‐ The developed method is novel from a literature point of view and can be of a great benefit to achieve the required properties of pigmented UV-curable system in inkjet printing of textiles. In addition, it could find numerous applications in surface coating.
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Keywords: Emulsions; Particle size measurement; Pigments; Polyesters; Polymerization; Resins

Document Type: Research Article

Publication date: January 12, 2010

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