scholarly journals Green dyeing of cotton fabrics by supercritical carbon dioxide

2015 ◽  
Vol 19 (4) ◽  
pp. 1283-1286 ◽  
Author(s):  
Juan Zhang ◽  
Lai-Jiu Zheng ◽  
Yu-Ping Zhao ◽  
Jun Yan ◽  
Xiao-Qing Xiong ◽  
...  
Keyword(s):  
Waste Water ◽  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Thermodynamic Parameters ◽  
Cotton Fabrics ◽  
Zero Waste ◽  
Dyeing Process ◽  
Entropy Of Activation ◽  
Enthalpy And Entropy ◽  
Supercritical Carbon

Green dyeing process with zero waste water emission is a hot topic recently. This paper reveals that supercritical carbon dioxide is the best candidate for this purpose. Effects of thermodynamic parameters, such as enthalpy and entropy of activation, on dyeing process are studied experimentally.

scholarly journals Effect of pressure of supercritical carbon dioxide on morphology of wool fibers during dyeing process

2015 ◽  
Vol 19 (4) ◽  
pp. 1297-1300 ◽  
Author(s):  
Lai-Jiu Zheng ◽  
Peng-Peng Yin ◽  
Fang Ye ◽  
Wei Ju ◽  
Jun Yan
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Release Rate ◽  
Surface Brightness ◽  
Color Difference ◽  
Effect Of Pressure ◽  
Pressure Release ◽  
Dyeing Process ◽  
Wool Fibers ◽  
Supercritical Carbon

In this paper, the effect of pressure release rate on dyeing of wool fibers was studied in the supercritical carbon dioxide dyeing. Surface morphology, chemical composition and color difference at different pressure release rates were investigated by employing scanning electron microscope, color matching, and measuring instrument. Experiment data reveal that wool fibers are easy to be damaged with increasing pressure release rate. Fiber?s surface brightness varies also with the pressure release rate. The phenomena are theoretically explained using Bernoulli's principle.

scholarly journals Dye solubility in supercritical carbon dioxide fluid

2015 ◽  
Vol 19 (4) ◽  
pp. 1311-1315 ◽  
Author(s):  
Jun Yan ◽  
Lai-Jiu Zheng ◽  
Bing Du ◽  
Yong-Fang Qian ◽  
Fang Ye
Keyword(s):  
Carbon Dioxide ◽  
Theoretical Model ◽  
Supercritical Carbon Dioxide ◽  
Distribution Coefficient ◽  
Dyeing Process ◽  
Supercritical Carbon

Supercritical carbon dioxide fluid is an alternative solvent for the water of the traditional dyeing. The solubility of dyestuff affects greatly the dyeing process. A theoretical model for predicting the dye solubility is proposed and verified experimentally. The paper concludes that the pressure has a greater impact on the dyestuff solubility than temperature, and an optimal dyeing condition is suggested for the highest distribution coefficient of dyestuff.

Study on Dyeing of the Plasma Modification Silk Fabric in Supercritical Carbon Dioxide

2011 ◽  
Vol 175-176 ◽  
pp. 661-666 ◽  
Author(s):  
Jun Yan ◽  
Lai Jiu Zheng
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Ph Value ◽  
Orthogonal Experiment ◽  
Plasma Modification ◽  
Silk Fabric ◽  
Dyeing Process ◽  
Before And After ◽  
Fabric Strength ◽  
Supercritical Carbon

A study has been conducted into the dyeing of silk fabric in supercritical carbon dioxide. In order to reach better dyeing effect, plasma modifying is used to silk. Plasma modifying can decompose disulfide bond of the protein fiber, change the state of scale layer and break silk gum of fiber so that dyestuff could infiltrate. Factors of plasma modifying are fixed, including pH value, processing time. And they affect the values of fabric colour feature and fabric strength. In this work, C.I. Disperse Blue-77 and C.I. Disperse Yellow E-3G are used by combining orthogonal experiment and single factor analysis. During dyeing process, temperature and pressure have a great impact on the result. Modification process and dyeing process are optimized, and the best process is determined. The results presented in this study show dyestuff can infiltrate through modified fabric easily. Through the testing, the washing fastness and rubbing fastness of silk fabric after being modified are improved. The changes between before and after dyeing are analyzed by scanning electron microscope and infrared spectrometer. It is showed that modified fabric obtains a better effect.

scholarly journals Water in supercritical carbon dioxide dyeing

2015 ◽  
Vol 19 (4) ◽  
pp. 1301-1304 ◽  
Author(s):  
Lai-Jiu Zheng ◽  
Jing-Lu Guo ◽  
Yong-Fang Qian ◽  
Bing Du ◽  
Wei Ju ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Low Temperature ◽  
Supercritical Carbon Dioxide ◽  
Color Difference ◽  
Low Pressure ◽  
Water Interaction ◽  
Effect Of Water ◽  
Dyeing Process ◽  
Wool Fabrics ◽  
Supercritical Carbon

This paper investigates the effect of water serving as entrainer on the dyeing of wool fabrics in supercritical carbon dioxide. Compared with previous supercritical dyeing methods, addition of water makes the dyeing process more effective under low temperature and low pressure. During dyeing process, dyestuff can be uniformly distributed on fabrics?s surface due to water interaction, as a result coloration is enhanced while color difference is decreased.

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