Waterless Dyeing And Its Advantages And Disadvantages

Waterless dyeing is a dyeing technology that does not use water as a dyeing medium, but uses organic solvents to replace water. It has been widely used in the textile market.

Advantages of waterless dyeing

Save water resources, reduce pollution, improve dyeing efficiency, and reduce costs.

Disadvantages of waterless dyeing

1. The dyeing process of waterless dyeing is complicated, and it is necessary to strictly control the ratio of dyes and auxiliaries, dyeing temperature and time and other parameters, otherwise it will lead to poor dyeing effect or problems such as spots and pollution.

2. Due to the complex production process, its price is much higher than that of traditional dyes.

Principle: CO2 is heated and pressurized to a supercritical fluid state that is neither gas nor liquid, and is continuously circulated between the dye tank and the dyeing tank by a circulating pump. The supercritical CO2 fluid dissolves the dye while dyeing the fabric. The dyeing conditions are 20-30MPa, 80-160℃, and the dyeing time is about 1h. After the dyeing is completed, the remaining dye and CO2 can be recovered and recycled.