Study On Technology And Deep Dyeing Performance Of Dyeing Aramid1414/Cellulose Blends

Aramid1414as a new high-performance textile fiber has excellent physical andchemical performance. As a high temperature and enhanced material, it is widely usedin the aerospace, high-temperature insulation materials, as well as thermal protectionservice. But at the same time aramid1414dyeing is extremely difficult because itsmolecular structure is tightly packed. And there is poor cohesiveness, hygroscopicityand expensive, which limited its application in the textile and garment field. Therefore,the dying performance and mechanism research of aramid1414, as well as selectingcellulose fibers(such as cotton fiber)and aramid1414for blending, making up for thelack of aramid1414,and blended fabric dyeing in order to achieve the same color hasbecome an important topic.This topic mainly includes three parts.The first part was the dyeing behavior research of the cationic dyes to aramid1414. By testing the K/S value of aramid1414dyeing fabric to research and discussthe assist dyeing agent’s dosage, temperature, time, dosage of dyes and the pH valueof dye bath to the dyeing performance of aramid1414fabric. And ultimatelydetermine the optimum dyeing conditions: the dosage of assist dyeing agent was2%,the dyes(o.w.f.) was5%, sodium nitrate was15g/L, dyeing temperature was110℃,dyeing time was60min. and the pH value of dye bath was4.5.The second part was the dyeing mechanism discussed. Primarily through aramid1414fabric dyeing kinetics, thermodynamic properties, as well as the fabric useddyeing auxiliary before and after treatment changes in infrared absorption spectrum,thermal gravimetric analysis,scanning electron microscopy to investigate the cationicdye aramid1414fabric dyeing mechanism.Cationic dyeing aramid1414fabric kinetic studies indicated that the pseudosecond-order kinetic model agreed well with the adsorption system of cationic dyeadsorption kinetics of aramid1414fabric. With the elevated dyeing temperature, thebalance of the cationic dyed on the aramid1414fabric dyeing amount decreased, thedye rate constant increased.The study of thermodynamics of cationic dyes on aramid1414fabrics indicated that cationic dye adsorption isotherms were Nernst and Langmuir composite, that thedye to two yuan adsorption aramid1414fabric. Within80℃to100℃temperaturerange, with the elevated dyeing temperature, the increase in the amount of cationicdye on the transfected into the fabric of aramid1414, aramid1414adsorbed dyesaturation value increases. The negative adsorption affinity and enthalpy change ofcationic dye on aramid1414show that the adsorption process was an exothermic andspontaneous process.Using infrared absorption spectroscopy, thermal gravimetrc analysis, scanningelectron microscopy to analyze physical properties, chemical properties before andafter pretreatment of aramid1414, the results showed that after using the assist dyeingagent deal with aramid1414, the surface of the fiber puffed and appears etched, andthe glass transition temperature(Tg) decreases. it was beneficial to cationic dye ondye.The third part was the study of dyeing the aramid1414/cellulose fiber blendedfabric in the same bath.Screen reactive dyes which suitable cation/active one bath two-step mixed colorsto determine process prescription that aramid1414/cellulose fiber blended fabric dyesby a bath two-step. The results showed that: the reactive red K2BP, reactive cuilanKGL, reactive yellow KGN were suitable for mixed colors. Dyeing aramid1414fabric shaded as the base under optimum conditions maxilon red GRL4%(o.w.f),when aramid1414/cotton blended fabric cationic/reactive dyes one bath two-step dyeto achieve the same color, aramid1414/cotton blended fabric dyeing prescription:Maxilon red GRL4%(owf), Reactive Red K2BP3.5%(o.w.f), Reactive Yellow KGN0.1%(o.w.f), activity Cuilan KGL0.1%(o.w.f).