No-washing dyeing technology solves the problem of water pollution

On May 7, 2020, has developed a new type of non-washing environmentally friendly high-fastness nano-disperse dye paste, which can reduce dyeing without changing the existing dyeing process. The amount of finishing additives used makes the water-saving efficiency of the printing and dyeing process more than 60%, which can effectively alleviate the pressure of water pollution faced by the printing and dyeing industry.

In the context of increasingly severe environmental protection, solving the problem of water pollution is the top priority of the printing and dyeing industry. In the textile printing and dyeing industry, problems such as high floating color and low color fastness are common. It is mainly caused by the dye particles staying on the surface of the fiber, not entering the fiber and combining with the fiber. For many years, washing with water has been used as the only way to remove floating colors and improve color fastness.

"The CC series of new non-washing environmentally friendly high fastness nano-disperse dye pastes developed by us is a new water-saving dyeing product." Du Changsen, vice president of the company, introduced that this technology effectively solves the traditional printing and dyeing auxiliaries themselves and their solubilizing dyes Pollution of water makes the dye bath recyclable and saves more than 60% of water in the polyester fabric dyeing process.

"Specifically, this product uses a hyperbranched polymer with multiple active functional groups to modify disperse dyes, which solves the problem that the color fastness of the fabric is difficult to meet the standard. When the dye is steamed at high temperature, the hyperbranched The high molecular polymer coats the dye that does not completely enter the fiber structure to form microcapsules. This structure has a strong binding force with polyester fabrics, so the printing and dyeing and washing process is reduced, and the sewage discharge is reduced, and the sewage COD content Also less.” Du Changsen said.

The polyester fabric dyed with this product has high color fastness, good softness, and high water-saving efficiency. It can also reduce the amount of printing and dyeing auxiliaries such as reducing cleaning agents and softeners by more than 50%, which is good for high twist and tightness. The polyester fiber fabric can also achieve the effect of high color fastness and uniform coloring.

In addition, the CC series of new non-washing environmentally friendly high-fastness nano-disperse dye pastes have been applied in printing and dyeing enterprises in Shandong, Jiangsu, Zhejiang and other places. Users responded that dyeing with this technology has the characteristics of water saving more than 60%, high color fastness, good hand feeling, time and material saving.

It is understood that polyester fiber is a hydrophobic fiber with good physical and chemical properties and compact structure, and it is usually dyed with disperse dyes. When using disperse dyes to dye polyester fabrics, it is impossible to ensure that all the dye molecules enter the fiber during dyeing. Especially when dyeing medium and dark colors, a large amount of disperse dyes will adhere to the fiber surface. Only by removing the floating color can the fiber color be firmer.

The traditional dyeing technology is completed under the combined action of a variety of auxiliaries, which also leads to a huge amount of auxiliaries during dyeing. After dyeing, these auxiliaries all enter the water body and form the largest pollution source in the dyeing industry. In addition, in order to ensure that the color fastness of dyed products meets the requirements, a sufficient washing process is also essential. A series of washing auxiliaries such as detergents are required, which has formed another major source of pollution in the dyeing industry.