Polyester fiber is the textile fiber with the largest output and variety in China. However, China's new polyester PTT (polyethylene terephthalate) chips have long relied on imports, and their key polymerization technologies have been monopolized by DuPont and Shell. The key technology and industrialization of PTT and in-situ functionalized PET polymerization and its composite fiber preparation completed by JSSH Holdings Group Co., Ltd., the first multi-functional polyester large-capacity industrialization technology, raw material innovation to drive product innovation, and development for the polyester industry Created a new model to realize the localization of high-quality textiles from polymer sources to end products, and thus won the second prize of the 2015 National Science and Technology Progress Award.
Mei Feng, chief engineer of the JSSH Group, told reporters that the project relies on the National Science and Technology Support Program for high-comfort series polyester fiber preparation and application technology. After years of arduous research, four breakthroughs in core technologies were finally achieved, not only filling domestic The gaps in esters and composite functional fibers have also enabled China to lead the world in this field.
First, the project broke through the complete set of technologies such as PTT and modified PTT (MDPTT) polymerization, by-product treatment and recovery, independently developed a titanium-tin composite catalyst and a new type of stabilizer, and designed a five-pot kettle for esterification and low-temperature polycondensation. Process to achieve efficient energy-saving flexible copolymerization. The slow-release crystal granulation technology developed by the project can save energy by 27% to 35%. The cyclic dimer depolymerization, separation and recovery technology not only reduces material consumption, but also realizes the harmless treatment of acrolein and allyl alcohol.
Secondly, the project has overcome the key technologies of large-capacity multifunctional PET (MFPET) and large-capacity polymerization and melt-spinning, and created organic (P22) / inorganic (ATO) antistatic agents, organic (UV234) / inorganic ( TiO2) is an integrated multifunctional technology of anti-ultraviolet synergistic effect, hygroscopic monomer and porogen composite, independently designed swirl homogenization anti-coagulation equipment, static elimination device, three-pot esterification and double squirrel cage polycondensation kettle and High polishing and low temperature melt conveying system successfully produced MFPET.
Third, the project designed a special spinning key device, developed MPTTT, MFPET, and high-viscosity-differential PTT (MDPTT) / MFPET fiber forming technology to produce multifunctional combined polyester fibers such as moisture absorption, elasticity, antistatic, and ultraviolet resistance.
Finally, the project successfully developed a set of thermal and wet comfort polyester synthesis and fiber manufacturing technology, which solved the problems of ultra-dispersion of functional powders, esterification, polycondensation rate, molecular structure and relative molecular quality control, and developed a multifunctional polymer. The key technology of continuous esterification and melt-spinning of esters produces thermo-wet comfort polyester filaments, staple fibers and fabrics with different functional combinations.
The results of this project have been successfully industrialized in JSSH Group, and the first 30,000 tons / year PTT continuous polymerization production line with independent intellectual property rights, 250,000 tons / year fully extinction multifunctional polyester polymerization and melt direct spinning production line, and 5 10,000 tons / year MPTTT / MEPET elastic controllable series multifunctional polyester fiber production line. The output and market share of the MPTTT, MEPET and its composite fibers produced by the project rank first in China. The differentiation rate of polyester fibers exceeds 80%, and the cumulative new sales revenue for the company is nearly 10 billion yuan. The products are exported to Europe, America, Japan, South Korea and other countries. area.
The construction of a 30,000-ton / year PTT / MDPTT polymerization device makes JSSH the third company to have PTT polymerization know-how after DuPont and Shell; 250,000 tons / year large-capacity multifunctional MFPET melt direct-spun polyester fiber The construction of the production device realized the expansion of multi-functional polyester into the fields of fine denier, ultra-fine denier fiber and special-shaped fiber, making Shenghong the world's largest manufacturer of melt-spun multi-functional polyester filaments; 50,000 tons / year The construction of the elastic comfort series polyester fiber production line has realized the production of safe, comfortable and multifunctional fibers, fabrics and clothing using new functional polyesters synthesized by ourselves, forming an independent intellectual property right.
Experts in the industry believe that the successful research and development and industrialization of the project have promoted the progress of polyester technology and product upgrades, met people's demand for high-grade new fabrics, brought new economic growth points for enterprises, and improved China. International market competitiveness of chemical fiber fabrics.
The heat and humidity comfort polyester filaments, staple fibers and fabrics produced through this project with different functional combinations rank first in China in terms of output and market share.