Method for preparing master batches through direct PET melt mixing and equipment special for method

Abstract

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.

Description

technical field [0001] The invention relates to a method for directly mixing PET melts to prepare master batches and special equipment thereof. Background technique [0002] At present, masterbatches are prepared by using carriers such as PET or PBT. These carriers are purchased by the masterbatch factory in the form of slices. These carriers are ground into powder and then mixed into functional powders. They are melted by twin-screw extrusion and subjected to high shear rate. , high-speed mixing and then sent to the granulator, granulated and dried to obtain the masterbatch. However, the twin-screw extrusion process involved in the traditional process requires high-speed rotation and mixing, which makes the viscosity of the melted raw materials drop significantly under the shearing effect of high-speed rotation, so it is necessary to choose high-viscosity slice compensation in the selection of raw materials. The loss of viscosity reduction during the tablet making process ...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems that the current process is easy to cause melt viscosity reduction, complicated process, waste of resources and high cost, the present invention proposes a process such as insignificant viscosity reduction, reduction of slicing and granulation, drying, solid-phase polycondensation, and powder grinding, which greatly Method and special equipment for preparing masterbatch by direct mixing of melts to reduce electricity, packaging and transportation costs

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