Study On Carrier Dyeing Of Polysulfonamide Fabric And Mechanism With Disperse Dye

Polysulfonamide(PSA)fiber isaromatic polyamide fiber with high temperature that has been achieved industrializedand China has its independent intellectual property rights,mainly used as protection products,filter material and insulation field.It is difficult to dye for PSA fiber under conventional conditions and easy to make its dyed productsfade in the environment of high temperature or sunlight when used.In recentyears,the study on dyeing of PSA fiber abroad is rarely reported,some domestic researchers study ondyeing performance of PSA fiber,but thepoor color fastness to sunlight and heat has not been solved.Therefore,the study on PSA dyeing and color fastness improvementhas great significance.Polysulfonamideknit was taken as the main substrate of study in this paper;the main work is as follows:1.Applicable dyes,carrier and dyeing process for polysulfonamide fabric were studied.This paper choosed Dianix AM disperse dye with excellent performance,especially good color fastness to sunlight and to sublimation and environmental-friendly carrier C-50;the optimum carrier dyeingprocess of polysulfonamide fabric with disperse dyeing was obtained through the single factor analysis andorthogonal experiments.The dye concentration,carrier concentration,dyeing temperature,dyeing time,pH value and liquor ratio were 3%(o.w.f),30g/L,135℃,80min,5.5 and 30:1 respectively.Compared with dyeing of polysulfonamide fabric with disperse dye at high temperature and pressure,carrier dyeing could increase the K/S value of dyed fabric obviously,and ensure excellent color fastness,in which the sunlight fastness was equal to or above 4 grades,The heat pressure fastness was equal to or above 3 grades.2.Theimprovement of color fastness to sunlightof polysulfonamidefabric by anti-UV finishing was studied.Thepolysulfonamide fabricwas finished by anti-UV agents with the dye-bath or padding and theimpact of color fastness to sunlightof polysulfonamidefabric by anti-UV finishing was studied.The results showed that:anti-UV finishing can increase 0.5 to 1 gradeof the sunlight fastnessof polysulfonamidefabric.3.The effect of carrier C-50 on the role and performance of polysulfonamide fiber and disperse dye was studied.The impact of the carrier C-50 on color tone,solubility,particle size of the disperse dye,supramolecular structure and morphology structure of polysulfonamide fiber was analyzed by modern analytical testing methods.The results indicated that the carrier C-50 had no effect on the color tone,and could increase the solubility of disperse dye in water,reduce the particle size of the disperse dye;the carrier C-50 could increase the diameter and cross-sectional area of polysulfonamide fiber,it explained that the carrier C-50 had a welling effect of polysulfonamidefiber;the carrier C-50 didn’t change the chemical structure of the polysulfonamide fiber and the chemical structure of the carrier C-50 was similar to polysulfonamide fiber,it was easy to get inside the fiber and plays a role in swelling;the carrier C-50 had almost no effect on surface morphology,thermal properties,flame retardancy and mechanical properties of polysulfonamide fiber,therefore it would not affect its applicable performance.4.The effect mechanism of carrier C-50 dyeing process of polysulfonamide fabric was studied.The disperseyellow AM-2Rwas taken as an example,the influencemechanism of carrier C-50 dyeing process of polysulfonamide fabric was studied through dyeing kinetics anddyeingthermodynamics.The study of kinetics indicated that the dyeing rate constant and diffusivityof disperse dye on polysulfonamide fiber were increased by the carrier C-50,and the half-dyeingtime was shorten.Thermodynamic analysis showed that the adsorption isotherm type of polysulfonamide fiber dyed with disperse dye at low concentration was not affected by the carrierC-50.They were both generally consistent with Nernst-type adsorption.Moreover,thedistribution coefficient on the polysulfonamide fiber and in the dye bath of disperses dye,dyeing affinityand enthalpy were increased by the carrier C-50 and the dyeing entropy was decreased.