In recent years, China's textile industry has continued to maintain a strong growth trend. With the adjustment of the variety structure, new textile fibers such as Tencel fiber, soy fiber, ultra-fine denier fiber, and various multi-component blended textiles, as well as new printing and dyeing technologies such as digital ink jet printing technology, etc. An endless stream. How to meet the needs of the textile industry for the development of new dyes, independent development of high-performance dye varieties, increase product added value and overall technical level, has become an important issue facing China's dye industry. When interviewed by reporters, Liu Hongshan, secretary general of the China Dyestuff Industry Association, pointed out that dye technology innovation should focus on product original innovation, development of reactive dyes, and promotion of green production processes.
With the ever-increasing demand for dyestuff fastness, application performance and environmental protection in the international textile market, all countries have put new dye development in an important position. As a dye-producing country in China, one of the problems that needs to be solved is the product innovation. Without the support of original innovation technology, it is difficult to become a strong dye-producing country.
In recent years, many new fibers and new fabrics have emerged, such as soybean composite fibers, bamboo fibers, new wood pulp fibers, polylactic acid fibers, various new polyesters, and new differentiated fibers. These fibers are either alone or blended with other fibers. , With its unique properties and uses, it is important to develop dyes and application technologies suitable for new textile varieties. In order to meet the requirements of the market for new dyes, researchers have conducted in-depth research on the synthesis and application of reactive dyes, such as dyeing supramolecular chemistry, the relationship between the molecular structure of dyes and the properties of dyes, the principle of dye mixing and synergism, and the dyeing of additives. The impact of performance, etc., and the development of a new dual-reactive dye, so that the dyeing latitude increases, improves the reproducibility of staining.
At the same time, strengthening the basic research of the dye industry can not be ignored, the focus of the research is the structure-activity relationship of dyes and the dependence of dyes and the environment, and the development of new environmentally friendly dyes with China's independent intellectual property rights.
Liu Hongshan said that reactive dyes have complete chromatograms, bright color, excellent wash fastness, simple application process, and relatively inexpensive prices, and are favored by users. Reactive dyes can also replace some ice-dyeing dyes, sulfur dyes, and vat dyes to become the most important dyes for cellulosic fibers, and their production has exceeded 20% of the total amount of dyes in the world. With the continuous adjustment of the product structure of the domestic textile printing and dyeing industry, the demand for reactive dyes has increased year by year. Last year, China imported more than 28,000 tons of reactive dyes.
The reactive dyestuff structure does not contain carcinogenic aromatic amines, so although these dyes currently have problems of low dye utilization, large electrolyte consumption during dyeing, large amounts of salty colored wastewater, and intractability, etc., in the future It is still the best choice for dyes for cellulosic fibers. The development of reactive dyes will become a focus and a hot spot. In particular, new reactive dyes such as high fixation rate, high color fastness, high liftability, high levelness, high reproducibility, and low salt dyeing will become the technological development direction. Studies have shown that an effective way to solve the fixation rate and salt content is to develop new structural dyes, increase the molecular weight of dyes, introduce two identical or different active groups, and at the same time make the dyes have excellent washing fastness and Light fastness, and reduce the amount of salt when dyeing.
Liu Hongshan said that dyes and organic pigments have many production units, complex reactions, and serious "three wastes" pollution. Today, more and more attention is paid to environmental protection. China's dye enterprises should pay attention to the use of advanced technologies to improve their processes. At present, the more important high-tech products in the dye industry are catalytic technology, sulfur trioxide sulphonation technology, continuous nitration technology, thermal insulation nitration technology, directional chlorination technology, combination efficiency technology and various clean production processes. In particular, catalytic technology is currently the most active and fastest-growing green manufacturing technology in the world, which can significantly reduce the "three wastes" produced during dye production.
In addition, technical services will become the most fiercely competitive area for dye companies in the future. Enterprises should strengthen technical services, such as providing customers with dyeing and printing dye products, while providing suitable printing and dyeing processes; supporting the development of processing auxiliaries and auxiliaries for dyeing and dye application technology development. In addition, strengthening the development of pollution end treatment technology in the field of suitable dyes is also an important part of the development and adoption of high technology in the dye industry in China.
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