Papers by Keyword: Dyeing

Abstract: The mechanism of monascus red pigment dye on wool fiber was studied by analyzing of dyeing kinetics and thermodynamics. The results showed that the dyeing rate is quite high at the beginning of dyeing at 70°C-100°C.The diffusion coefficient rise while half-dyeing time decrease With the temperature rise. Its adsorption accords with the combination of Nernst and Langmuir adsorption model. Its enthalpy and entropy of dyeing was 15.21kJ/mol and 46.87J / (mol·K) respectively, which show that wool dyeing with monascus red is a endothermic process. This theoretical is useful to built dyeing process for wool fiber with monascus red.

Abstract: The dyeing properties of the polylactic acid (PLA) fiber with four different disperse dyes was studied. In the disperse dyeing process, differential scanning calorimeter (DSC) analysis was applied to test and analyze the changes of the glass-transition and melting temperature of the dyed and pure PLA fiber. The results indicated that not only the structure of the dispersed dyes and the dyeing conditions affected the dyeing performance of PLA fiber, but also the degree of the crystallinity of PLA fiber contributed to the final dyeing results. Moreover, the transformation of such crystallinity during the disperse dyeing process should be taken into account when the dyeing temperature was studied.

Abstract: Factors affecting reactive dyeing in the laboratory by 1:4 bath ratio was analyzed, such as dyes behaviors, dye bath circulation, dyeing conditions. Dyeing in the laboratory was carried out respectively with deep-color RW and light-color RW dyes by 1:4 bath ratio. By measuring levelness and K/S value of the dyes and color fastness.

Abstract: Partial dyeing and finishing properties of the copolymerization fiber of wool regeneration protein and polyacrylonitrile are analyzed in this article. The optimum bleaching condition is 30%H₂O₂30g/L, Na₂SiO₃6%(o.w.f) for 60min at 60°C.This new fiber can be dyed by acid dye and cationic dye in one-bath one-step dyeing process. Interaction between anionic surfactant NNO and cationic dye has been investigated using conductometric examinations. The results are that the mass ratio of cationic dye and NNO is 1:7-9, the ratio of anionic dye and cationic dye is 2:8 which is the same as the constituents of fiber. The method of making this special dyestuff is drying the cationic dye (liquor) and NNO (liquor) compound, and then mixed with acid dye, thus trichromatic dyestuffs have been made on the whole through experiment.

Abstract: To optimize the dyeing condition of cotton fabric modified with color media, the effects of dyeing time, temperature and amount of color media were studied in the paper. The results exhibited that the exhaustion of cotton fabric modified with color media increased greatly, even up to 97.1%. The optimal dyeing condition can be defined as follows: the dyeing time of 36 min, the temperature of 50 °C and the amount of color media of 5% (o.w.f).

Abstract: In order to improve the dyeing property of cotton fiber, in this paper, the cotton fabric was modified by 2, 3-epoxpropyl triethyl ammonium chloride (ETEAC). Four reactive dyes were employed to test the dyeing property of modified cotton fabric. The results showed that the dyeing property of cotton fabric was improved greatly. When the concentration of ETEAC was equal to or above 7%, most of the dye-uptake rate of the modified cotton fabric could reach to nearly 100%. And the dyeing rate was very high. These suggested that the cationic groups with three ethyls could attract anion dyes efficiently, though the cationic groups with three ethyls were greater than cationic groups with three methyls. The modified cotton fabric could not be dyed uniformly. Sodium dodecyl sulfate (SDS) was efficient retarder for the modified cotton fabric.

Abstract: Computer color matching technology has many advantages for coloration processes theoretically. However, in practice, many manufacturers would rather employ experienced color matching engineer with very high salary than buying computer color matching instrument. There are many reasons for this phenomenon. This paper checks the effect of Datacolor SF600 color measuring and matching system in laboratory. The experiment show that the color matching result is much better than that of a green hand person, but far from that being expected. The reasons are discussed and new theory is expected to be developed to give a fundamental solution.

Abstract: In order to change the single color of wood surface after chemical plating, this study conducts the surface chemical plating Ni, then in the containing ammonium molybdate solution for staining. The content of Mo is 4.09% when the wood surface displays purple; the content of Mo is 8.65% when the wood surface displays yellow; the content of Mo is 25.26% when the wood surface shows rainbow; the content of Mo is 40.92% when the wood surface shows pink; the content of Mo is more than Ni when the wood surface displays black; besides, after different time, there are purple, yellow, rainbow, pink, black, which can be seen. Mo, Ni, P form multilayer film thickness, which has an effect on the optical transmittance.

Abstract: Laccase from Rhus vernicifera was applied to catalyze the polymerization of gallic acid (GA) as a way of “in situ” dyeing and finishing for wool, silk, nylon, cotton and viscose fabrics. The laccase-catalyzed polymerization of GA was confirmed by the results of UV-vis spectroscopy and differential thermal analysis. The adsorption of the GA oxidation product on the fibers contributed to the color effect and functional performance of treated fabrics. The dyed fabrics exhibited gray colors with pale to medium shades, depending on fiber categories. All the dyed fabrics showed significantly enhanced UV protection performance and antioxidant activity, and the dyed wool and silk had obviously improved deodorizing ability. These improved functional properties were related to the increased quantity of aromatic rings, phenolic hydroxyl groups and carboxyl groups in the GA oxidation product adsorbed by fibers.

Abstract: This experiment compared four different dyeing cotton fabrics processes with the reactive dye. It was found that under microwave irradiation dyeing, the dye-uptake and fixed percentage of the reactive dye were improved significantly and the salt and the alkali dosage in the dyeing bath were greatly reduced. Analysis found by XRD that microwave irradiation did not significantly change the internal structure of the cotton fibers and only slightly increased the orientation degree of them, so the tensile strength of the fabric was not significantly altered. Therefore, the main function of microwave in dyeing process was that its alternating electric field made the dye and the fiber molecule polarization, to increase the thermal motion of the molecules and the interaction between the polar molecules, thereby improving the dyeing rate and the fixing rate of the reactive dye.