Provided are a method for preparing master batches through direct PET
melt mixing and equipment special for the method. The method comprises the steps that melt is introduced from a main melt pipeline, a delustering agent and a dispersing agent are mixed in proportion, and the mixture enters a double-screw extruder in a negative-pressure state for low-speed preliminary mixing; and then blending is carried out through an ultrasonic dynamic mixer, dicing,
drying and packaging are carried out after
water cooling, and the corresponding master batches are prepared. The equipment comprises an extruder
assembly, an auxiliary material bin
assembly, a dispersing agent bin
assembly, an ultrasonic dynamic mixing assembly, a dicing assembly, a
drying and
packaging machine and a control box. The main melt pipeline is connected to a discharging opening of a discharging assembly, and communicates with a first feeding opening pipeline of the extruder assembly through a
branch melt pipeline, and a discharging opening of a corresponding feeding assembly communicates with a second feeding opening pipeline of the extruder assembly. The method and the equipment have the beneficial effects that
viscosity is lowered, the quality is stable, and good spinnability is achieved; and the procedures of
slicing and dicing,
drying,
solid phase condensation
polymerization,
grinding and the like are omitted, and cost is reduced.