Study On The Performance And Dyeing And Finishing Process Of Mdified Polyester Parster Fiber

In recent years, there are many studies about modified polyester mainly focusing oncationic dyeable polyester(CDPET). CDPET can be applied broadly because of completechromatography, bright colors and low cost. PARSTER fiber is a new CDPET which ismodified by adding third monomer and new-type fourth monomer to common polyesterfiber that only has binary monomer. Compared to ECDP, the quantity and type of both thethird and fourth monomer in PARSTER have been adjusted, leading to the change of thestructure and dyeing property of PARSTER fiber. Therefore, it is necessary to studyproperties and dyeing process of PARSTER fiber. The main research aims to investigatethe following aspects.Firstly, the crystallinity and molecular structure of PARSTER fibers are characterizedby X-Ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR)respectively. Both Differential Scanning Calorimetry (DSC) and Thermo GravimetricAnalyzer (TGA) are employed to characterize the thermal properties of PARSTER fibers.The FTIR experimental results show that sulfonic acid class group was contained inPARSTER fiber. It was observed the the crystallinity of PARSTER fiber was32.57%byXRD characterization. It was found that the glass transition temperature and meltingtemperature of PARSTER fiber was76℃and220℃respectively by DSC testing. TheTGA experimental results show the temperature at the maximum thermal decompositionrate and the epitaxial decomposition temperature was447℃and409℃respectively. Inaddition, some changes including mechanical properties, molecular weight, degree of crystallinity and surface morphology of PARSTER fibers after treating with differentchemical agents are also investigated. It was interesting to note the surface of thePARSTER fiber treated with alkali was corroded uniformly. What’s more, the mechanicalproperties, molecular weight and degree of crystallinity are decreaced, while the thermalproperty was changed slightly. At the same time, it was found the breaking strength ofPARSTER fibers treated with strong acid decreased obviously. Contrarily, the breakingstrength of PARSTER fibers with weak acid changed slightly. Compared to the PARSTERfibers treated with alkali, the surface, crystallinity and thermal property of PARSTERfibers treated with strong or weak acid were not changed obviously. Reducing agentinsurance powder had large influence on fiber strength, which was opposite to theinfluence of hydrogen peroxide on fiber strength.Secondly, the dyeing procedure of disperse dyes on PARSTER fiber has been studied.The experimental results show that the dyeing rate and exhaustion rate were affected bytemperature deeply. At the temperature of80℃, the dyeing rate of disperse red AF-R,dispersion golden AF-RN, disperse blue AF–BRN on PARSTER fiber are low. However,the dyeing rate of disperse blue AF-BRN on PARSTER fiber was improved greatly at thetemperature of90℃. Eventually, orthogonal test was used to determine the best dyeingconditions: dyeing temperature98℃, pH value5.5and bath ratio1:20.Finally, the dyeing principle and dyeing process of cationic dye on PARSTER fiberare investigated. The results show that the fiber saturation value of Astrazon Red FBL,Astrazon Golden Yellow GL-E, Astrazon Blue FGGL on PARSTER fiber were5.41%,2.01%and1.77%. In addition, it was fount that the adsorption of cationic dye onPARSTER fiber conforms to the Langmuir type and the dyeing rate began to enhance at90℃, realizing dyeing balance after60min dying at98℃. It was observed the dyeingsolution pH value should be controlled at4and the dying rate can be reduced by reducinginitial dyeing temperature and adding1227surfactant.