Ecological dyeing and finishing technology has become an important foundation for the sustainable development of the textile industry
At present, China has become the largest country in the world textile printing and dyeing industry. While the textile industry is creating economic benefits for the country, it also draws widespread attention from the society due to resource consumption and pollutant emissions. With the strengthening of people's awareness of environmental protection, ecological dyeing and finishing technology has become one of the important foundations for the sustainable development of the textile industry.
Dyeing and finishing technology tends to be more ecological. From a global perspective, dyeing and finishing technology has developed towards ecological development. Dyestuffs and additives have become greener and safer. Dyeing and finishing products have presented high quality, multi-functionality, and high added value. The main technical developments include: efficient short-flow pretreatment, small bath ratio dyeing, energy-efficient water washing, energy-saving drying, plasma processing, and other energy-saving water-saving production techniques, supercritical dyeing processing technology, laser processing technology, microsuspension dyeing Technology, biological enzyme treatment technology, digital inkjet printing technology, ultrasonic processing technology, various functional finishing technologies, etc. The research and development of the corresponding dyestuffs are focused on green dyes and auxiliaries, and the various color fastnesses, coloring rates, enhancements, and vividness of the dyes are still the main goals pursued, focusing on reactive dyes and disperse dyes. On dyes. In order to meet the rapid development of digital inkjet printing technology, many companies have also developed new inks for rapid digital inkjet printing technology. In addition, new dyes have been developed for new textile fibers such as polylactic acid fibers, lyocell fibers and polytrimethylene terephthalate (PTT) fibers.
Effectively promote energy saving, emission reduction and consumption reduction After years of efforts, the cleanliness of dyeing and finishing, energy saving, emission reduction and consumption reduction in China are being effectively promoted. Key technologies for cold pad-batch dyeing of cotton, microwave non-polar ultraviolet photocatalytic oxidation and reuse of textile printing and dyeing wastewater, new continuous dyeing technology for textile degeneration coating, high-throughput membrane processing and recycling technology for printing and dyeing wastewater, and COOLTRANS cold transfer printing technology , key technologies for low-temperature rapid pre-processing of textiles, integration of recycling technologies and devices for resource recycling in the batik industry, and breakthroughs in industrialization and application of a number of key technologies have enabled the textile industry to fully accomplish its energy-saving and emission-reduction target tasks, and achieve a cumulative reduction in the overall energy consumption per unit of added value. About 32%, freshwater withdrawal from the 100m printing and dyeing cloth decreased by 37.5%, the reuse rate of water in the printing and dyeing industry increased to 15%, and the accumulative reduction in the unit value of sewage discharge decreased by more than 40%. At the same time, textile products were continuously improved. The added value.
Ecological dyeing and finishing must also have new breakthroughs in China's annual printing and dyeing processing machine fabric more than 600 million meters, more than 12 million tons of knitted fabrics, 30 million tons of standard coal consumption, wastewater discharge 3 billion tons, CODcr discharge 280,000 tons, for China's water resources and The carrying capacity of the environment presents great challenges. Compared with the level of textile printing and dyeing technology in developed countries, the water consumption and energy consumption per unit product in China is 2 to 3 times. The average content of pollutants in wastewater produced is about 2 times of that in the “construction of ecological civilization” society. There is a clear gap in requirements. At present, in the textile dyeing and finishing industry, some high-risk toxic and hazardous textile chemicals are still in use. There are 26 types of 70 kinds of environmental hormones and textile auxiliaries identified, which have a serious impact on product safety and environmental ecology. In general, the dyeing and finishing industry in China has exceeded the international standards in terms of breaking through the “technical trade measures”, “green barriers” and “blue barriers” set by the developed countries.
It follows the development trend of high quality and functionalization of dyeing and finishing products, ecologicalization of dyeing and finishing, and green and safe dyes and additives. The pre-treatment technology has been further developed on the basis of efficient decocting, short flow, biological enzyme pretreatment, pre-cold-pile processing, continuous flat pre-treatment of knitted fabrics, etc., adapting to the requirements of “ecological and energy-saving” and breaking through the low-temperature bleaching of cotton fabrics. , knitted fabrics, and other key technologies before cold-piling; dyeing techniques based on clean production techniques such as cold pad-batch dyeing, small bath ratio dyeing, continuous padding of coating, low-salt and low-salt reactive dyes, controlled reactive dye dyeing, etc. , To further adapt to the requirements of “ecological and high-efficiency”, to break through key technologies such as waterless and waterless dyeing, reactive dye wet and short-steam dyeing, and horizontal cold-rolled pile dyeing of knitted fabrics; the development of printing process technology is adapted to “high-efficiency and high-quality” The trend is to develop a new generation of digital ink jet printing technology based on the second generation and third generation ink jet printing technologies; the finishing technology will become “multifunctional, intelligent” and “eco-friendly” with the global textile and apparel industry. The development of accelerating the development of non-formaldehyde high level non-iron finishing technology, new polyester high-efficiency halogen-containing flame retardant alternative technologies, and the development of non-fluorinated waterproof agent, Care textiles, smart textiles technology, diversified, personalized products, improve the quality and added value of domestic fabrics.