Having fleece and coats that are soft, non-fading, and resistant to pilling is everyone’s requirement for both simple and luxurious winter wear. Among the second prize projects of the National Technology Invention Award in 2014, there is an invention that sounds quite awkward and professional – the new copolyester MCDP continuous polymerization, spinning and dyeing and finishing technology, which can be used to produce products that meet the above conditions. The energy-saving and environmentally friendly “magic fabric” can help us realize this small but long-term elusive clothing wish.
This project was jointly completed by Donghua University and a certain company in Shanghai. Project leader Gu Lixia, a professor at Donghua University who has been engaged in chemical fiber research for a long time, said that my country’s annual output of polyester fiber reaches 40 million tons, accounting for more than 70% of the world’s total. Large-capacity continuous polymerization melt direct spinning polyester production capacity has exceeded 2/3 of the total, and most of them produce conventional polyester fibers. Most polyesters have a semi-rigid macromolecular structure, a tight fiber structure, and poor dyeability and touch. Improving the dyeability of fibers is an important direction for the functionalization of polyester fibers. However, there has always been the problem of difficult control of polymerization. The fabrics require alkali reduction treatment, and the bottleneck issues of energy consumption and emissions have not been solved, which seriously affects the promotion and application of polyester fiber modification technology. . Among them, the homogeneity of polyester fiber in my country is serious, and transformation and upgrading are difficult. It is urgent to solve the key technology of large-capacity functional polyester continuous polymerization.
The new copolyester MCDP continuous polymerization, spinning and dyeing and finishing technology solves the problem of polyester homogeneity and breaks through the energy consumption and emission bottlenecks of polyester production. The “super-soft and easy-to-dye polyester fiber product” developed in this project has the low-carbon and environmentally friendly characteristics of boiling dyeing under normal pressure and does not require alkali treatment. It also has cotton-like effects such as super-soft feel, good hygroscopicity, and significant anti-pilling properties.
In Gu Lixia’s view, another significant significance of this invention lies in energy conservation and environmental protection. This aspect refers to the fact that new polyester products use low-temperature reactions in polyester synthesis. Compared with the high-temperature reaction requirements of original polyester products, energy consumption is reduced to a certain extent. In the spinning process, regardless of the drying temperature , spinning temperature and heating temperature are all lower than conventional polyester. Especially in the dyeing and finishing process, new polyester products adopt the normal pressure boiling dyeing process without the need for alkali reduction treatment.
On the other hand, it means that new polyester products can be used in cashmere imitation technology. Gu Lixia said that cashmere is rare and expensive. Even coats on the market that are called “all cashmere” often only contain 10% cashmere. The production of cashmere involves the goat breeding industry. Since the grass that has been gnawed by goats is difficult to grow back, the cashmere manufacturing industry has long caused considerable environmental protection problems. The fiber material made of new polyester is quite soft, and when blended with cashmere, it is very similar to pure cashmere in feel and comfort. Therefore, the imitation cashmere process can not only reduce the price of cashmere products, but also help protect the grass.
The industrialization of new copolyester technology has also achieved great success. Recently, a company took the initiative to find Gu Lixia, hoping to use fiber materials made of new polyester in the production of cashmere-like fabrics. Gu Lixia agreed to the cooperation request and will soon conduct research and development in this area, which is expected to take several months. Previously, new polyester products have been successfully used in the imitation cashmere process of making cashmere sweaters. It is reported that as early as 2006, Gu Lixia and her team began to prepare for research and development on this issue. In 2009, after being included in the national “Eleventh Five-Year Plan” science and technology support plan, this subject was officially launched, and was finally completed and passed acceptance in 2013. Currently, this project has applied for 10 Chinese invention patents and 3 international invention patents. Before 2014, this technology had earned US$9.096 million in foreign exchange.
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