Sodium alginate was used as raw material to prepare modified sodium alginate(SA-X)through Ugi reac-tion,and UV curable printing paste was prepared with pigment dispersion and UV curable polyurethane acrylic ester(PUA)lotion.The printing was carried out on cotton fabrics using screen printing techniques.The effects of SA-X on print-ing performance were evaluated by assessing viscosity,fineness,contact angle,colorimetric properties,and fastness.The re-sults indicated that SA-X could increase the viscosity of printing paste,and enhance the accuracy and coloring depth of fabric printing.Due to the introduction of hydrophobic structures in SA-X molecules,the hydrophobicity of printed fabrics was enhanced.In addition,with the increasing dosage of SA-X,the color fastness of printed fabrics was significantly im-proved,indicating that SA-X could participate in the curing reaction of PUA,improve the integrity of film formation,and form better coating of pigments on printed fabrics.
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