In the face of accelerating the comprehensive green transformation of economic and social development, which is the only way to achieve sustainable development, the textile industry is faced with multiple tests of not only holding the "rice bowl", but also promoting energy saving, water saving and carbon reduction.

In Foshan City, Guangdong Province, greening and digitalization are quietly reshaping the ecology of the textile industry. A new technology of waterless dyeing is gradually moving towards Chinese consumers and even for a wider international application market.

At the 2024 China International Textile Fabrics and Accessories (Autumn/Winter) Expo, the booth of 湙 Dyeable Waterless dyeing technology attracted the attention of visitors from the United States, France, Japan, Vietnam and other countries. Consumers access the traceability system through the NFC (Near Field wireless communication) function on the clothing product tag, so that they can intuitively understand the production data of the whole chain from fiber, yarn, fabric to clothing, especially the water saving contribution behind each product, and jointly witness the future of green textile.

"Anhydrous dyeing is specifically to use organic solvents instead of water as a medium for dyeing, dyeing and coloring links do not use water, dyeing without adding salt to promote dyeing, you can achieve even more than the traditional water bath dyeing effect." There is almost zero discharge of waste water during the whole dyeing process, which greatly reduces the impact on the environment." In front of the booth, the staff of Guangdong Weiwei Environmental Technology Co., LTD. (hereinafter referred to as Weiwei Environment) explained in detail.

From facing the "three high" problems of high energy consumption, high water consumption and high pollution, to becoming a "water-saving top student" in the printing and dyeing industry, how to achieve a breakthrough in waterless dyeing technology?

Reactive dye dyeing generally requires the use of a lot of water and chemicals for pre-treatment, followed by dyeing, washing and post-treatment. The researchers found that the use of recyclable non-aqueous media instead of water can effectively avoid the hydrolysis side reaction of reactive dyes, almost no need to wash after dyeing, thus simplifying the entire dyeing process.

Compared to traditional dyeing methods, the water-free dyeing technology can reduce the total water consumption by 95%. The simplification of the dyeing process not only reduces water and energy consumption, but also significantly reduces the time required for the entire dyeing process from 12 hours in the traditional method to 6 to 8 hours. It is estimated that the dyeing water of the technology is reduced by 95%, the salt is reduced by 100%, the chemical consumption is reduced by 73%, the recycling rate of non-water media is over 99.8%, and the production efficiency is increased by 50%.

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