Effects Of Diethylene Glycol And Cotton Fabric Pretreatments On The Performance Of Reactive Dye Inkjet Printing

Reactive dye inkjet printing is playing a more and more important role in textile printing due to its advantages of no plate making,no restriction of flower size and high production flexibility compared with traditional printing technology.The quality of reactive dye inkjet printing products of cotton fabric is determined by reactive dye ink and cotton fabric.Therefore,it is very important to study the properties of reactive dye inks and the surface pretreatment of cotton fabrics to improve the effect of inkjet printing.In this paper,diethylene glycol was selected as additive,and the effects of diethylene glycol concentration on the aggregation properties of reactive dyes with different structures were studied by measuring the UV-Vis absorption spectra of three reactive dyes with different structures in the mixed solution of diethylene glycol and water;The viscosity and surface tension of the reactive dye solution containing different concentrations of diethylene glycol were tested;The effect of the concentration of diethylene glycol on the injection performance of the dye solution was discussed by observing the droplet morphology of the solution;At the same time,ink jet printing on cotton fabric was carried out with the solution mentioned above,and the effect of diethylene glycol concentration on the color performance of cotton fabric and the definition of pattern contour was investigated.On the basis of this research,in order to further improve the effect of inkjet printing,the apparent color yield and contour clarity of cotton fabrics treated with different pretreatment agents containing diethylene glycol were studied,and the influence of the type and concentration of pretreatment agents on the inkjet printing of reactive dyes was explored.The rheological properties of three kinds of pretreatment agents for cotton fabrics were analyzed by measuring the change of viscosity with shear frequency;The effects of the type and concentration of the pretreatment agent on the color performance and the definition of the pattern were studied by measuring the apparent color yield of the cotton fabric and the maximum spread area of the dye solution on the surface of the cotton fabric.The results show that the reactive dye molecules disaggregation under the hydrophobic force of diethylene glycol;Diethylene glycol can control the viscosity and surface tension of reactive dye solution,so as to control the morphology of the ink droplets,inhibit the formation of satellite droplets,and improve the definition of the pattern outline of the printed cotton fabric;The cotton fabric with 10% diethylene glycol reactive dye solution for ink-jet printing has the highest apparent color yield.The three pretreatment agents have different rheological properties.The sodium alginate pretreatment agent is close to Newtonian fluid,while the xanthan gum pretreatment agent and sodium polyacrylate pretreatment agent have both non-Newtonian fluid characteristics and high structural viscosity.The results showed that 1.5% sodium polyacrylate had the best ability to improve the color performance and the clarity of pattern outline of the spray printed cotton fabric,followed by 1.5% xanthan gum,and 3.5%sodium alginate had the lowest ability.However,xanthan gum pretreatment agent is biodegradable and environmentally friendly.The rheological properties of sodium alginate pretreatment agent close to Newton fluid make the pretreatment process more convenient and efficient.Therefore,the optimal pretreatment scheme can be selected according to actual requirements.The above research can provide technical support for the selection of pretreatment scheme for cotton fabric in the process of reactive dye inkjet printing.