The Experts below are selected from a list of 7827 Experts worldwide ranked by ideXlab platform

Tao Luan - One of the best experts on this subject based on the ideXlab platform.

  • Dyeing of cotton fabric with a reactive Disperse Dye in supercritical carbon dioxide
    Journal of Supercritical Fluids, 2012
    Co-Authors: Jiajie Long, Guodong Xiao, Ling Wang, Chuanglong Cui, Jing Liu, Muying Yang, Ke Wang, Chen Chen, Yimeng Ren, Tao Luan
    Abstract:

    Abstract A novel method was developed for the Dyeing of cotton fabric with a vinylsulfone reactive Disperse Dye in supercritical carbon dioxide by carrying out Dye adsorption (or uptake) and a catalytic fixation reaction with a phase transfer catalyst—Triethylene diamine (TEDA) in separated baths, respectively. The results show that the Dye adsorption or uptake in supercritical carbon dioxide Dyeing bath significantly depended on system temperature and pressure, as well as an appropriate experiment time; significant improvements of Dye fixation efficiency and color strength on wet and dry cotton fabrics after a Soxhlet extraction were achieved by employing the catalyst of TEDA under various conditions. The fastness data indicate that acceptable rub and staining fastness rated at 4–5 was obtained for the Dyed cotton samples involving a catalytic fixation step, except that a fading fastness should be further improved.

Dongjie Yang - One of the best experts on this subject based on the ideXlab platform.

  • hydroxypropyl sulfonated lignin as Dye dispersant effect of average molecular weight
    ACS Sustainable Chemistry & Engineering, 2015
    Co-Authors: Dongjie Yang
    Abstract:

    Sulfonated lignin obtained from pulping waste liquor is a nontoxic and renewable polymer that can be used as a dispersant in the Dyeing industry. In order to reveal the effect of the lignin dispersant’s molecular weights on Disperse Dye, three hydroxypropyl sulfonated alkali lignin (HSL) samples with different molecular weights were obtained by controlling the dosage of etherification to cross-link lignin molecules. The molecular weight of HSL can be adjusted from 8,100 to 14,830 Da. More than 80% of phenolic hydroxyl groups of HSL samples were blocked by etherification compared to that of AL and which decrease with increasing molecular weight. The increasing molecular weight of HSL causes a considerable reduction in the staining effect of HSL on fiber since the adsorption amount of HSL on the fiber decreases by reducing the phenolic hydroxyl group. HSL with Mw of 11,020 Da contains 2.10 mmol·g–1 of the sulfonic group and as low as 0.46 mmol·g–1 of the phenolic hydroxyl group (compared to 2.32 mmol·g–1 of...

Jin Xin Lin - One of the best experts on this subject based on the ideXlab platform.

  • Dyeing of cotton fabric with reactive Disperse Dye contain acyl fluoride group in supercritical carbon dioxide
    Dyes and Pigments, 2017
    Co-Authors: Da Fa Yang, Xiang Jun Kong, Hong Sheng Cui, Dan Gao, Ting-ting Huang, Jin Xin Lin
    Abstract:

    Reactive Disperse Dyes with mono- and bi-acyl fluoride reactive groups have been synthesized using a simple and convenient method. The structures of these Dyes have been defined by 1H, 13C and 19F NMR. The cotton Dyeing in supercritical carbon dioxide (Sc CO2) with Dyeing temperature varying from 60 °C to 120 °C and time between 1 h and 3 h and with the concentration of 0.5% owf (on weight of fabric) have been studied. Significant improvement of the color fastness of washing and rubbing has been observed owing to the covalent bond formed between the reactive group of Dyes and the functional group of cotton fibers. Besides, the Dyed fabrics possess favorable fastness properties, indicating the achievement of lower-temperature Dyeing of cotton in Sc CO2. Additionally, the end products meet the garment Dyeing standards as well. A mechanism of Dyeing process is tentatively speculated meanwhile.

Jiajie Long - One of the best experts on this subject based on the ideXlab platform.

  • Dyeing of cotton fabric with a reactive Disperse Dye in supercritical carbon dioxide
    Journal of Supercritical Fluids, 2012
    Co-Authors: Jiajie Long, Guodong Xiao, Ling Wang, Chuanglong Cui, Jing Liu, Muying Yang, Ke Wang, Chen Chen, Yimeng Ren, Tao Luan
    Abstract:

    Abstract A novel method was developed for the Dyeing of cotton fabric with a vinylsulfone reactive Disperse Dye in supercritical carbon dioxide by carrying out Dye adsorption (or uptake) and a catalytic fixation reaction with a phase transfer catalyst—Triethylene diamine (TEDA) in separated baths, respectively. The results show that the Dye adsorption or uptake in supercritical carbon dioxide Dyeing bath significantly depended on system temperature and pressure, as well as an appropriate experiment time; significant improvements of Dye fixation efficiency and color strength on wet and dry cotton fabrics after a Soxhlet extraction were achieved by employing the catalyst of TEDA under various conditions. The fastness data indicate that acceptable rub and staining fastness rated at 4–5 was obtained for the Dyed cotton samples involving a catalytic fixation step, except that a fading fastness should be further improved.

Yiqi Yang - One of the best experts on this subject based on the ideXlab platform.

  • effect of Disperse Dye structure on Dye sorption onto pla fiber
    Journal of Colloid and Interface Science, 2007
    Co-Authors: David Karst, Digvijay Nama, Yiqi Yang
    Abstract:

    Abstract The effect of the structure of various Disperse Dyes on their percentage sorption onto polylactide (PLA) is explained using molecular modeling. The interaction energies between the Dyes and PLA have been calculated, and a linear equation has been developed to predict the percentage sorption on PLA based on the Dye–PLA interaction energy. The predicted percentage sorption for a Dye is shown to agree with its experimentally obtained percentage sorption on commercial PLA fabric and on PLA fiber extruded in our laboratory. Within the Dyes, the functional groups that form the strongest interactions with PLA are N(C2H4OCOCH3)2, (CO)2NC3H6OCH3, SO2NHC6H5, NO2, CN(NH)C6H4, and CH(CO)2C6H4, and the groups that form the weakest interactions with PLA are Br and Cl.

  • Using the solubility parameter to explain Disperse Dye sorption on polylactide
    Journal of Applied Polymer Science, 2005
    Co-Authors: David Karst, Yiqi Yang
    Abstract:

    The solubility parameters of polylactide (PLA), poly(ethylene terephthalate) (PET), and various Disperse Dyes calculated according to the group contribution method were used to explain the low sorption of some Disperse Dyes on PLA but the high sorption of the same Dyes on PET. It was found that the Dyes with high sorption on PLA tended to have solubility parameters near that of PLA, which has a lower solubility parameter than that of PET. It was also found that the solubility parameter, which was calculated based on cohesive energy and molar volume at 25°C, was more appropriate for explaining Dyeings at lower temperature, 100 and 110°C, than those at higher temperature, 130°C. Based on the finding that Dyes with solubility parameters near that of PLA tend to have high sorption on PLA, general structures for Disperse Dye that may have high sorption on PLA were proposed. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 416–422, 2005

  • comparison of Disperse Dye exhaustion color yield and colorfastness between polylactide and poly ethylene terephthalate
    Journal of Applied Polymer Science, 2003
    Co-Authors: Yiqi Yang, Shah Huda
    Abstract:

    Ten popular Disperse Dyes with different energy levels and chemical constitutions were used to compare their exhaustion, color yield, and colorfastness on polylactide (PLA) and poly(ethylene terephthalate) (PET). Only two out of the 10 Dyes had exhaustions higher than 80% on PLA at 2% owf. Five out of the 10 Dyes had exhaustions less than 50%. All 10 Dyes had more than 90% exhaustion on PET, whereas six of them had exhaustions of 98% or higher. There was no obvious pattern as for which energy level or which structure class provided Dye exhaustion better than that of others. Although PLA had lower Disperse Dye exhaustion than that of PET, it had higher color yield. Based on the 10 Dyes examined, the color yield of PLA was about 30% higher than that of PET. This means that even with low Dye uptake, PLA could have a similar apparent shade depth as that of PET if the same Dyeing conditions are applied. Our study supported that the lower reflectance, or reflectivity, of PLA contributes to the higher color yield of PLA than that of PET. A quantitative relation between the shade depth of PLA and PET based on their Dye sorption was developed. Disperse Dyes examined had lower washing and crocking fastness on PLA than on PET. The differences in class were about 0.5 to 1.0. If the comparison was based on the same Dye uptake, the differences might be larger. The differences in light fastness between the two fibers were smaller than that in washing and crocking fastnesses. The light fastness of Disperse Dyes on PLA is expected to be even better if the comparison is based on the same Dye uptake on both fibers. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3285–3290, 2003

  • comparison of Disperse Dye exhaustion color yield and colorfastness between polylactide and poly ethylene terephthalate
    Journal of Applied Polymer Science, 2003
    Co-Authors: Yiqi Yang, Shah Huda
    Abstract:

    Ten popular Disperse Dyes with different energy levels and chemical constitutions were used to compare their exhaustion, color yield, and colorfastness on polylactide (PLA) and poly(ethylene terephthalate) (PET). Only two out of the 10 Dyes had exhaustions higher than 80% on PLA at 2% owf. Five out of the 10 Dyes had exhaustions less than 50%. All 10 Dyes had more than 90% exhaustion on PET, whereas six of them had exhaustions of 98% or higher. There was no obvious pattern as for which energy level or which structure class provided Dye exhaustion better than that of others. Although PLA had lower Disperse Dye exhaustion than that of PET, it had higher color yield. Based on the 10 Dyes examined, the color yield of PLA was about 30% higher than that of PET. This means that even with low Dye uptake, PLA could have a similar apparent shade depth as that of PET if the same Dyeing conditions are applied. Our study supported that the lower reflectance, or reflectivity, of PLA contributes to the higher color yield of PLA than that of PET. A quantitative relation between the shade depth of PLA and PET based on their Dye sorption was developed. Disperse Dyes examined had lower washing and crocking fastness on PLA than on PET. The differences in class were about 0.5 to 1.0. If the comparison was based on the same Dye uptake, the differences might be larger. The differences in light fastness between the two fibers were smaller than that in washing and crocking fastnesses. The light fastness of Disperse Dyes on PLA is expected to be even better if the comparison is based on the same Dye uptake on both fibers. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3285–3290, 2003