Abstract:

A series of organosilicone and amino modified photosensitive polyurethane acrylates (PUA) were designed and synthesized for improve the safety, handeling and rubbing fastness of photo-curable ink-jet printing fabrics. According to the research of the rheological properties, photo initiated properties, tensile properties, optical properties and SEM analysis, the polyurethane acrylate has integrated function of low viscosity and modulus, high flexibility and co-initiation. While curing, the copolymer siloxane chain segments migrated to the film surface. The cured film has better flexibility and water resistance while the mechanical property loss is  small when the content of organosilicone is 5%. The photo-curable ink-jet printing ink was prepared successfully by mixing a photocurable polymerization system composed of the modified PUA and hydroxyethyl acrylate, 2-Hydroxyethyl acrylate, camphorquinone and other additives, and has the conversion rate os 96%, the transparency above 95%, the tensile stress of 1.5 MPa, the maximum elongation at break of 530%, and 100% elongation stress lower than 0.4MPa, low toxicity and good stability. The fabric subjected to the photo curing Ink-jet printing ink has good rubbing fastness up to grate 4.

Key words: polyurethan acrylate, photocuring, digital ink-jet printing, printing ink