Synthesis Of Low Viscosity Poly Urethane Acrvlate Oligomer And Its Application In Textile Blue Light-curable Digital Inkjet Printing

Digital inkjet printing is the world’s most advanced printing technology, printingink droplets are used in the process by a computer "on demand" control of theproduction process to achieve the green represents the future trends in the field ofprinting. But in the subsequent paragraphs curing and finishing stage, there are stillcomplex processes, energy consumption serious problems. The subject applicationmade of low-viscosity urethane acrylate as curing binder, by adding a photoinitiator, apigment, reactive diluent monomer, wetting and dispersing agent for preparing theblue light curable inkjet printing inks, printing directly to the surface of the fabric, andthen blue lead to macromolecules curing film, instead of the traditional process ofwashing and thermal curing step, ink jet printing fabric. The topic for the synthesisand formulation of ink-jet oligomers were optimized, and analyzes its wearability, theresults show the optimization of ink has better wearability.Firstly, we studied the synthetic process of low viscosity polyurethane acrylate,The effect of temperature, material molar ratio, catalyst amount on the synthesisprocess of polyurethane acrylate oligomer were discussed by monitoring the–NCOcontent with the dibutylamine titration and FTIR-ATR methods. Polyurethane acrylateoligomer was synthesized using isophorone diisocyanate (IPDI), propylene glycol1000(PPG-1000) and hydroxyethyl acrylate (HEA). The optimized conditions werelisted as follow: The first synthesis step was performed without catalyst at80oC for7hours, and the second synthesis step was performed with0.05%catalyst and0.1%inhibitor at50oC for2hours. Rheological behavior and polymerization performanceof the polyurethane acrylate oligomer were evaluated by rotary rheometer andphoto-differential scanning calorimetry (Photo-DSC), respectively. The resultsshowed that the polyurethane acrylate oligomer displayed a low viscosity andexcellent blue light induced polymerization performance which can satisfy therequirements of the blue light curable ink in textile digital printing.Then, we conducted the research from the rheological properties, aggregation properties, dispersion stability of three aspects of the performance of the ink systemstudy to examine the activity of the reactive diluent monomer, pigments, wettingdispersant on the ink system. The best formula to get ink for: urethane acrylate57.6wt%(wt%as a percentage of the total weight accounted for ink, the same below), acrylate28.8wt%, hydroxyethyl acrylate9.6wt%, pigment0.5wt%, camphorquinone1wt%,4-(dimethylamino) benzoate1wt%, wetting and dispersing agent1.5wt%.Finally, Cotton fabric with an example of taking performance ink system werestudied, discussed the polymerization system of initiator system and light conditionson the inkjet printing fabric dry and wet rubbing fastness and color depth and fabricsfrom apparent micro aspects of morphology were observed before and after rubbing.The results show that the friction color fastness preferred ink printed fabrics are up tothree, with good color fastness to rubbing; printing color uniformity, excellent color,and ink cured film coated microscopic fibers intact.