High-viscosity pbt polymerization reactor and method for preparing direct melt-spun high-viscosity pbt/low-viscosity pet two-component elastic fiber

Abstract

The present disclosure relates to a high-viscosity PBT polymerization reactor and a method for preparing direct melt-spun high-viscosity PBT/low-viscosity PET two-component elastic fiber. The polymerization reactor is provided with two parallel shafts, a plurality of disc reactors is disposed on the two shafts, and a plurality of homogenizers is arranged at intervals on an outer edge of a disc combination along its circumferential direction in the low viscosity zone. When preparing the two-component elastic fiber, two production lines are used to produce a high-viscosity PBT melt and a low-viscosity PET melt, respectively, and then spinning. The high-viscosity PBT production line comprises a first esterification reactor, a second esterification reactor, a first prepolymerization reactor, a second prepolymerization reactor, and a high-viscosity PBT polymerization reactor. By using this method, the cost is low and the production capacity is high, the process flow is shortened, and the elastic fiber has good properties.