Properties of alginate fiber spun-dyed with fluorescent pigment dispersion

•Fluorescent pigment dispersion had excellent stability when prepared with poly (styrene-maleic anhydride).•Fluorescent pigment dispersion shows excellent compatibility with sodium alginate fiber spinning solution.•Fluorescence intensity of alginate fibers reached optimal intensity when mass content of fluorescent pigment to fibers was 4%.•Spun-dyed alginate fibers have excellent rubbing and wash fastness.

Spun-dyed alginate fiber was prepared by the spun-dyeing method with the mixture of fluorescent pigment dispersion and sodium alginate fiber spinning solution, and its properties were characterized by SEM, TGA, DSC, and XRD. The results indicate that fluorescent pigment dispersion prepared with esterified poly (styrene-alt maleic acid) had excellent compatibility with sodium alginate fiber spinning solution, and small amount of fluorescent pigment could reduce the viscosity of spun-dyed spinning solutions. SEM photo of spun-dyed alginate fiber indicated that fewer pigment particles deposited on its surface. TGA, DSC, and XRD results suggested that thermal properties and crystal phase of spun-dyed alginate fibers had slight changes compared to the original alginate fibers. The fluorescence intensity of spun-dyed alginate fiber reached its maximum when the content of fluorescent pigment was 4%. The spun-dyed alginate fiber showed excellent rubbing and washing fastness.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide