PTT and in-situ functionalized PET polymerization technology: filling the gap in the new polyester field

Polyester fiber is the textile fiber with the largest output and the most varieties in Chi.

Mei Feng, chief engineer of Shenghong .

First of all, the project broke through the complete set of technologies such as PTT and modified PTT (MDPTT) polymerization, by-product treatment and recovery, independently developed titanium-tin composite catalysts and composite new stabilizers, and designed five reactors for back-process esterification and low-temperature polycondensati.

Secondly, the project conquered the key technologies of high-capacity multifunctional PET (MFPET) and high-capacity polymerization and melt direct spinning, and created organic (P22)/inorganic (ATO) antistatic agent compound, organic (UV234)/inorganic ( TiO2) anti-ultraviolet agent synergistic effect, hygroscopic monomer and porogen composite integrated multi-functional technology, independently designed swirl homogenization anti-coagulation equipment, static elimination device, three-pot esterification and double-squirrel cage stirring polycondensation kettle and High polishing low temperature melt conveying system, successfully made MFP.

Thirdly, the project designed a special spinning key device, developed MDPTT, MFPET and high viscosity difference PTT (MDPTT) / MFPET fiber forming technology, to obtain moisture absorption, elasticity, antistatic, anti-ultraviolet and other multi-functional composite polyester fibe.

Finally, the project successfully developed a complete set of technology for polyester synthesis and fiber manufacturing for heat and humidity comfort, which solved the problems of functional powder hyperdispersion, esterification, polycondensation rate, molecular structure and relative molecular quality contr.

According to Mei Feng, the results of the project have been successfully industrialized in Shenghong Holding Gro.

The construction of 30,000 tons/year PTT/MDPTT polymerization plant makes Shenghong the third enterprise with proprietary technology of PTT polymerization after DuPont and Shell; 250,000 tons/year large-capacity multifunctional MFPET melt direct spinning polyester The construction of the fiber production plant has realized the expansion of multi-functional polyester into the fields of fine denier, ultra-fine denier and special-shaped cross-section fibers, making Shenghong the world's largest manufacturer of melt direct-spun multi-functional polyester filaments; 50,000 tons/ The construction of the elastic and comfortable series polyester fiber production line in 2019 has realized the preparation of safe, comfortable and multi-functional fibers, fabrics and clothing using self-synthesized new functional polyester as raw materials, forming independent intellectual property righ.

Industry experts believe that the successful R&D and industrialization of this project has promoted the progress of polyester technology and the upgrading of products, met people's demand for high-end new fabric consumption, brought new economic growth points for enterprises, and improved China's International market competitiveness of chemical fiber fabri.

The heat-moisture comfort polyester filaments, staple fibers and their fabrics produced through this project with different functional combinations have the highest output and market share in Chi.