جستجوی مقالات مرتبط با کلیدواژه « الیاف پشم » در نشریات گروه « مهندسی شیمی، نفت و پلیمر »

In this study the natural colorants of Jasir, Madder and Pomegranate skin are considered to be compatible with wool yarns. To this end, the ability to dye each of the dyes of aluminum doped and dentinite sulfates was used as one of the most commonly used methods. The calculation results of this method showed that the dyeing curve of the three colors of dessert and reno are similar to each other. While the ability to dye wool yarn varies with dye of the skin of the pomegranate, it differs from that of the other two dyes. In this way, the similarity of the dyeing ability of the two gestures and the rhine reflects the relative adaptability of these colored materials. While the difference between the dyeing curve of pomegranate skin is low compatibility with jersey and rhinos. After calculating the ability to dye, dyeing of woolen yarn was done by combining two colors in three different dimensions. Then the degree of color matching was measured through common computational relationships. The computational results show that the colors of Madder and Jashir are in good harmony with each other. While the combination of pomegranate peel with any of the two dyes of Madder and Jashir results in low compatibility with weak to weak grades. In addition, the results of this study showed that the two concentrations of dye in the mixed bath and the use of the tooth affect the degree of compatibility and change the degree of color compatibility. Overall, the results of this study showed that the dye of Madder and Jashir are very consistent with each other and can be considered in the bathroom for the coloring of wool. While it is not possible to combine two colorful materials with pomegranate peel due to poor compatibility grade.

In this study, kinetic behavior and dyeability of woolen yarns with madder and cochineal natural dyes were investigated. Dyeing rate was separately calculated for each dye at different times and temperatures. Results showed Patterson’s rate equation as the best model to describe dyeing rate in which rate constants in the range of 0.0031-0.0341 and 0.0024-0.0318 were obtained for cochineal and madder, respectively. Dyeing temperature had essential role on kinetic behavior and with the increase of temperature, dyeing rate and equilibrium time increased. Cochineal demonstrated better dyeability on wool than madder. Saturation point on wool was achieved using 20% and 60% owf of cochineal and madder dyes, respectively. Diffusion coefficient values at different temperatures were calculated from Hills’ equation, and it was found that temperature had key role on diffusion values. As temperature raised from 30 to 95 °C, diffusion coefficients increased from 0.83×10-11 to 7.4×10-11 in the case of madder and from 1.02×10-11 to 11.32×10-11 in the case of cochineal dye. Overall, the results of this study confirmed better dyeing performance, higher rate constant and diffusion coefficient for cochineal on wool compared to madder.

The dyeing of wool fibres with Madder dyes and aluminum sulfate mordents has been investigated. To optimize the dyeing process for achieving a favorable method، first the Taguchi''s experiments design and then single factor experiments were used. The selected parameters in the dyeing of wool fibres were: temperature، time، L: G، dyeing bath type، pH and auxiliary agents. In these experiments the selection criterion of optimized dyeing method was to achieve high color strength، appropriate leveling and fastness properties which were studied by spectrophotometry and visual examinations. The results showed that the optimum conditions for dyeing are as follows: temperature: boiling، time: 2 h، pH: 4-5، clay bath and L: G=30:1.