If you want to change the color of the cloth, just put it in the liquid carbon dioxide containing the dye, and the carbon dioxide will turn into gas again. The cloth no longer needs to be rinsed, and it will not fade in the water. This is the waterless dyeing technology jointly developed by Donghua University and Shanghai Textile Holding Group. Recently, this technology passed the acceptance test, and the prototype used in the production line has also been installed and entered the debugging stage. According to the project leader and Professor Dai Wei from the School of Chemistry and Chemical Engineering of Donghua University, this technology mainly uses carbon dioxide to be liquefied when added to more than 70 atmospheres at 30 degrees Celsius. After carbon dioxide liquefaction, the dye is dissolved in liquid carbon dioxide. The cloth or thread is dyed. The whole process does not require water and chemical additives, and the by-product carbon dioxide in the production process of the traditional fermentation industry can meet the carbon dioxide needs in the dyeing process and can be reused, especially for polyester fibers and some high-performance special fibers. it is good. The entire process does not produce pollution, which is both energy efficient and efficient.
It is understood that waterless dyeing is regarded as a revolution in the traditional dyeing and finishing industry worldwide. At present, only a few countries such as Germany, the United States and France have mastered the waterless dyeing technology, but they are still in the experimental stage. At the forefront of Germany, a 30-liter medium sample machine has been developed. The intermediate sample machine that Donghua University can use for production is also in the process of being produced, and will be put into use in May. The prototype developed by Donghua University can also be used for the dyeing of corn fiber, and the dyeing technology for natural materials is currently under development.
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