Tencel fabric cationized with chitosan can be effectively dyed with anionic dyes. To investigate the change of dyeing properties of cationized Tencel fabric, some experiments were performed under the several dyeing conditions with acid and reactive dyes. Whiteness index decreased with the increment of crosslinking agent concentration. The cationized Tencel fabric was dyed well by anionic dye such as acid dye, the dyeability of reactive dye was improved by addition of a little salt without alkali. The dye fixation on the cationized Tencel fabric was increased with chitosan concentration without electrolyte and alkali. The dyeability of Tencel treated with chitosan was better than controlled Tencel, especially under the acidic conditions. According to the number and the types of functional group of reactive dyes, dye affinity of the modified Tencel fabric varied and wash fastness of acid dye was better than reactive dye.
The preparations of deodorizing fibers using TiO2 have been investigated. TiO2 is known to be an excellent photocatalyst for the degradation of organic and inorganic contaminants in water. TiO2 catalyst have been supported on the glass fiber by a dip-coating procedure. The resulting materials have been characterized by XRD and SEM. The immobilized catalysts were tested in the photocatalytic degradation of NH3, CH3SH and CH3CHO. The deodorant activity(D.A.) of these deodorizing fibers was measured by chromogenic gas detector tubes. The efficient deodorant activity results have been achieved through the increase of TiO2 sol concentration.
Silk/Cotton fabrics were treated with butanetetracarboxylic acid(BTCA) under various treating conditions such as concentration, treated time and curing temperatures. Bending property, tensile strength, wrinkle recovery angle, and shrinkage were measured. The BTCA concentration in the saponfication mixture was measured by an isocratic HPLC equipped with the strong cationic exchange columm Aminex HPX-87-H and a UV detector. The detected concentration of BTCA was shown in silk side much more than that of cotton side. The bending and shrinkage properties were improved at minimum curing condition and the lower concentration of BTCA. Tensile strength decreased with increasing concentration of BTCA, curing temperature and treated time, while wrinkle recovery angle increased.
Dyeing properties and crosslinking effect of bifunctional reactive dyes on chitosan fiber were investigated to improve the stability of chitosan fiber against the mild acidic solution and the wet processing. Chitosan fibers were crosslinked with epichlorohydrin for comparing purpose, and dyed with C. I. Reactive Red 194, C. I. Reactive Blue 50, and the reactive dye having two α-bromoacrylamide groups at various concentrations. The initial dyeing rates of reactive dyes are rapid and chitosan fibers absorb the relatively large amount of dyes. The chitosan fibers dyed with these dyes show the low degree of swelling and the low solubility in 1 % acetic acid solution and also represent the higher thermal stability. The reactive dye with two α-bromoacrylamide groups shows higher crosslinking effect than other dyes.
Many studies have been carried out to improve the dyeability of anionic dyes onto cellulosic fibers. Modification of cotton using cationic compounds has been most widely used. In this study, an effort was made to cationize cotton fabrics using cellulose-reactive allylamine polymer, namely triazinyl N,N'-dimethyl-N,N'-diallyl ammonium chloride in the previous work. The results showed that the dye-uptake of treated cotton fabrics with acid dyes and reactive dyes markedly increased in the various dyeing conditions. In addition, the dyeing rate of cationized cotton was also faster than that of untreated counterpart. Furthermore, the antimicrobial property was also investigated to determine the effects of cationization.
Recently there has been a growing interest in the use of natural dyes in textile applications. Natural dyes can exhibit better biodegradability and generally have a higher compatibility with the environment.In this study, the colorants of Catalpa ovata bark were extracted with water and analyzed by spectrophotometry for their main colorant species. Cotton, silk and wool fabrics have been dyed with aqueous extract of Catalpa ovata bark and their dyeabilities on the fibers were studied. Additionally the fastness to washing, drycleaning and light, and the effects on bacteriostatic rate and UV-B protection rate were also investigated. The major colorant of the extract of Catalpa ovata bark was shown to be 6-O-trans-caffeoyl-β-D-glucopyranoside.Cotton, silk and wool fabrics dyed with the extract of Catalpa ovata bark were colored in yellowish red tint.The optimum dyeing condition of the colorants extracted from Catalpa ovata bark was three repeated dyeing at 95 ℃ for 1 hr using post mordanting. For dyed silk and wool fabric, the fastness to washing were improved by mordanting, and the fastness to drycleaning were very outstanding.In case of wool fabric dyed with the extract of Catalpa ovata bark, the bacteriostatic rate was increased drastically by 98.0%, and UV-B protection rate was increased by 97.3%.
Cotton fabric was treated with TiO2-PEG600 mixed solution by pad-dry-cure and wet-fixation process to improve the performance properties as well as antibiosis effect and its laundering durability. In this paper, the effects of concentration of TiO2/PEG and fixation process were investigated on laundering durability and properties of cotton fabric treated with glyoxal. As the concentration of TiO2/PEG increased fixation, W.I., K/S of treated cotton fabric increased. Application of wet-fixation method provided a further improvement in fixation, laundering durability of treated cotton fabric.