Advanced Materials Research Vols. 821-822

Abstract: Poly2-methyl acrylate-N-methyl pyridinium iodide (PMAMPI) was used as a new cationic agent to pretreat cotton with dip-pad-bake method. The pretreated cationic cotton showed electropositive in the process of dyeing with reactive dye. The thesis has studied the optimized process for salt-free dyeing conditions. In the optimized salt-free dyeing process, the cotton fabrics treated with PMAMPI showed a good performance compared to those in the process of traditional salt dyeing. The results showed that color yield and color fastness of the reactive dyes on the cationic cotton were satisfied. The three dyes with best color matching performance include reactive dark red WGE, reactive navy blue WTE and reactive golden yellow WRE.

Abstract: Reactive disperse blue R was adopted for supercritical CO₂ dyeing on modified wool hank by protease in self-made supercritical CO₂ dyeing device. The optimal process of dyeing was optimized by Box-Behnken Design experiment as following: dyeing temperature 103.60°C, dyeing pressure 24.23 MPa and dyeing time 62.03 min. Compared with the unmodified wool hank, the rubbing fastness and the washing fastness of modified wool hank by protease were better, and its color fastness met The National Standard (GB18401-2003).

Abstract: Using natural alizarin dyes to dye polyester - cotton65/35 knitted fabric in supercritical CO₂ dyeing equipment, and analysis the influencing parameters including dyeing temperature, time and pressure. The parameters are optimized as following: dyeing temperature 115.21°C, dyeing time 71.42 min and dyeing pressure 26.22 Mpa. Adopting alizarin dyes to dye polyester-cotton65/35 knitted fabrics in supercritical CO₂ could obtain a good dyeing effect, and the color fastness to rubbing and color fastness to washing of dyed fabrics meet The National Standard (GB18401-2003).

Abstract: Natural dye extracted from the mangrove bark was applied to a silk fabric by an exhaustion dyeing process. The dyeing was conducted with and without metallic salt mordants using pre-mordanting. It was observed that with an increase in the dye concentration, the ultraviolet (UV) protection factor (UPF) values ranged between good and excellent for the silk fabric. In addition, a darker color, such as that provided by a CuSO₄ mordant, gave better protection because of higher UV absorption. The results confirmed that natural dyes from mangrove bark extract with metal mordants have potential applications in fabric dyeing and in producing UV-protective silk fabrics.

Abstract: Dyed the silk with flos caryophyllata extract using different mordant dyeing methods, and the results show it will get purer black and better K/S value of dyed silk, if using ferrous ion post-mordanting. Optimize the process of the ferrous ion mordanting, and get the best condition was 10% (o.w.f.) of the mordant concentrations at 80°C for 50min. Using the mixture of flos caryophyllata and acutissima shell, the properties UV resistance was greatly enhanced.

Abstract: A natural dye extracted from lac was applied to a silk fabric by the use of pad-dry technique under different conditions. The dyeing properties were evaluated by measuring K/S and CIELAB values. In addition, the different fastness properties were evaluated. The effect of dyes at different mordant concentration levels with respect to their colour strength was also studied. Silk fabrics dyed with lac extract showed a light pink shade, while those dyed with alum and stannous chloride pinkish-red colour. Silk substrates dyed with CuSO₄ gave a purple red colour, while those dyed with FeSO₄ had a reddish-gray colour. The fastness properties ranged from fair to good, while washing fastness was poor level.

Abstract: This research was concerned with dye extraction from the bark of Garcinia Dulcis (Roxb.) Kurz and with the application of this dye for silk fabric dyeing by the pad-dry process. Silk fabrics dyed with Garcinia Dulcis (Roxb.) Kurz bark extract showed a pale yellow shade, while those dyed with alum and stannous chloride bright yellow and light yellow colour, respectively. Silk substrates dyed with CuSO₄ gave a yellowishgreen colour, while those dyed with FeSO₄ had a dark brown colour. The colour fastness to rubbing after dyeing the silk fabric treated with the mordant was investigated, the results of which showed fair to good fastness. The results confirmed that natural dyes from Garcinia Dulcis (Roxb.) Kurz bark extract have potential applications for fabric dyeing and producing ultraviolet (UV) protective silk fabric.

Abstract: In order to provide the theoretical basis for nylon fiber dyeing with turmeric yellow, the dyeing properties of turmeric yellow on nylon fiber were investigated. The appropriate dyeing condition of turmeric yellow on nylon fiber was pH=4, and the final temperature at 90°C~95°C. The dye uptake of turmeric yellow on nylon fiber was relatively high, and the building-up property of turmeric yellow on nylon fiber was good. The adsorption of turmeric yellow on nylon fiber accorded to Redlich-Peterson adsorption model proximally,and the adsorption model was validated by the simulation coefficients and normalized deviations. The dyeing process was endothermic with the dyeing heat ΔH⁰ =71.34kJ·mol^-1, and entropy change ΔS⁰ = 274J·mol^-1, In addition,the dyeing affinity -Δμ⁰ and saturation absorption capacity increased as the temperature increased.

Abstract: OHDAB (Octyl Hexyl Dimethyl Ammonium Bromide) is an efficient accelerant for reactive dyes on dyeing silk. The accelerating mechanism of OHDAB was studied in this paper. The results showed that OHDAB could make dye molecules assembled and the particle size of dye aggregate increased with the increase of OHDAB concentration. OHDAB could neutralize the negative charge of silk; even the zeta potential of silk could become positive with the increase of OHDAB concentration.

Abstract: Natural dye extracted from Pu-erh tea was applied to tencel fabric. The factors of pH values, temperature, dye concentration and dyeing time on dyeing performance of tencel fabric dyed with Pu-erh tea dyestuff were discussed. The color depth of tencel fabric was investigated on Data Color matching system in terms of k/s values. The optimal dyeing results were obtained at 45°C, pH 3.5, and dye concentration 0.66% owf for 10min. To improve the color depth of tencel fabric dyeing with tea dyes, the meta-mordanting (ferrous sulfate) was added in the dyeing process and the optimal meta-mordanting time for tencel fabric is 45 min.