Fluorinated reactive dyes knock on the door of high-end dyes

Business News Agency January 20 News In January of this year, Liyuan (Hubei) Technology Co., Ltd., Songzi City, Hubei Province, officially started production of a 1000-ton FL line of fluorinated reactive dyes and 3,000 tons of low-temperature reactive dyes. In the company's ongoing second-phase 20,000-ton capacity expansion project, it includes expansion of 3000 tons/year of FL series, 1000 tons/year of special dye for 80°C low-temperature wool, 1000 tons/year of nylon-cotton bath dye, 5000 tons/year. Reductant-free cleaning of disperse dyes, 1,000 tons/year of fluorine-containing normal-temperature transfer printing dyes, and cleaner production of related raw materials, and other related projects, will also be built 1000 tons / year of hydrophilic silicone oil production capacity. After the completion of the second phase of the project, Liyuan (Hubei) Technology Co., Ltd. will have more than 50% of the annual production capacity of 40,000 tons of textile chemicals, which is an environmentally friendly dye with significant energy saving and emission reduction effects.

In an interview, Luo Runfu, chairman of the company, emphasized that Liyuan Technology Co., Ltd. closely follows the requirements of the national “Twelfth Five-Year Plan” for product positioning, and focuses on the development of energy-saving, emission-reducing and environment-friendly textile dyes.

Why the development of reactive dyes containing fluorochemical dyes is currently the most popular cellulose dyes, because it is one of the best alternatives to banned dyes and other types of cellulose dyes, and can be dyed economically and with simple dyeing The operation obtains a high level of fastness, in particular good wet fastness. Reactive dyes have a wide spectrum of color, bright color, excellent performance, strong applicability, and their hue and performance are basically compatible with the market requirements for fiber and clothing.

The annual output of reactive dyes in the world now accounts for 20% to 30% of the total amount of dyes and ranks first in the dyestuffs for cellulose. However, the low utilization rate of common reactive dyes is a worldwide problem, and the utilization rate is generally 60 to 65%, and the widely used batch exhaustion dyeing process has a long processing time after dyeing, including rinsing, neutralization, washing, and the like. The time for soaping, rinsing, and fixing is 1/3 of the total dyeing time. The existing process not only takes a long time, consumes high energy, has a large amount of waste water, but also produces a large amount of difficult-to-treat colored salt-containing sewage. It does not necessarily wash away the fixed hydrolyzed dye, which in turn affects the fastness properties of the dyed material. Reactive dyes are also one of the most energy-intensive and heavily polluting dyes used in the printing and dyeing industry.

In China, about 100,000 tons of reactive dyes are used each year. Experts estimate that if all of the reactive dyes containing fluorinated reactive dyes or similar reactive dyes are used, there will be about 45 million tons of printing and dyeing wastewater per year, reducing the use of inorganic salt and alkali by 325,000 tons. Ten thousand tons.

However, the technical requirements for fluorine-containing dyes are very high. Before Liyuan FL series reactive dyes were brought to market, only DyStar worldwide had production plants in Germany, Huntsman and Clariant in Basel, Switzerland. Once the series of dyestuffs was introduced to the market, it attracted the attention of the printing and dyeing industry with its stable quality and the high price-to-performance ratio of some varieties with a price of only 50% of imported products.

Characteristics of Fluorine-Reactive Dyestuffs Liyuan Science & Technology and Wuhan Textile University have established a joint laboratory. After intense research and development of the fluorinated reactive dye FL series, this is a kind of fluorine-containing s-triazinyl and β-hydroxy sulfone. Ester-based double reactive dyes.

From a chemical point of view, in general, the electronegativity of fluorine is greater than that of chlorine. After replacing chlorine with fluorine, the density of the electron cloud of the carbon atom on the core decreases, making the plane of the reactive dye better. The two reactive groups are linked by an aliphatic bridging group, the parent dye molecule is small, has low to moderate affinity, and at the same time the aliphatic hydrocarbon ethylsulphone is linked to the fluorotriazine so that the electronegativity of the imine nitrogen atom is reduced. The effect of sulfone groups on steryl esters is therefore relatively stable. It is not prone to β-elimination reactions in lye, and it is relatively stable in lye. Such a molecular structure contains a fluoro-s-triazine group and a sulfydryl group, which has a strong reactivity and a fixation rate of more than 80%. At the same time, since the fluorotriazine activity is similar to that of ***, the sodium sulfoxide and sodium carbonate are stained. , bath ratio, temperature and time dependencies are small.

The project passed the appraisal of the high-tech achievements of the Hubei Science and Technology Department in 2010 and was awarded the second prize of scientific and technological progress in Hubei Province in 2010. At the same time, it was included in the Recommended Catalog of Advanced Technologies for Energy Saving and Emission Reduction of the China Printing and Dyeing Industry Association.

At present, this series of products also passed the eco-certification of Oeko Stand100 of Swiss Textile Testing Co., Ltd. and the GOTS eco-certification of the Netherlands Control Alliance. Obtained the pass to open the foreign high-end dye market.