Antimony-free polyester melt conveying process optimization method

Abstract

The invention discloses an antimony-free polyester melt conveying process optimization method. The method comprises the steps of S1, dividing a conveying process that an antimony-free polyester direct spinning melt flows out of a final polymerization kettle and then is extruded out of a spinning assembly spinneret plate into the following units: a conveying pipeline, a booster pump, a heat exchanger, a melt filter, a static mixer, a metering pump and a spinning assembly; S2, establishing a melt conveying and distribution mathematical model for each unit, and calculating and simulating pressure drop, temperature rise, viscosity drop and retention time in the conveying process of each unit according to models; S3, obtaining a weight relational expression of viscosity drop, temperature rise and retention time of the melt according to a simulation result; and S4, optimizing melt conveying and distribution process parameters according to the determined weight relational expression. According to the method, process design and model establishment are combined, timely heat dissipation and uniform mixing of the antimony-free polyester melt can be guaranteed, the performance of a product can be predicted in advance through the models, optimized process parameters are determined, and the stability of the melt quality is guaranteed.

Description

technical field [0001] The invention relates to the technical field of melt delivery, in particular to an optimization method for an antimony-free polyester melt delivery process. Background technique [0002] Polyethylene terephthalate (PET) is a polycondensation reaction product of ethylene glycol and terephthalic acid, and is a linear macromolecule with high crystallinity and high melting point (about 260°C). As a thermoplastic polyester, PET has good mechanical properties, electrical insulation, chemical resistance and other characteristics. The production of polyester fiber is mainly carried out through melt direct spinning, and melt delivery is one of the key links. Esters are degraded and bubbles are formed. If the temperature is too low, the viscosity of the melt will be too high, resulting in a series of problems such as spinning ends. [0003] Antimony-based catalysts are generally used in the traditional PET preparation process. However, there are heavy metal an...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the lack of systematic research on the relationship between the parameters of the antimony-free polyester melt delivery process and the quality of the polyester melt in the prior art, so it is impossible to improve the melt rate of antimony-free polyester by optimizing the delivery process. In order to solve the problem of body quality, an optimization method for antimony-free polyester melt conveying process is provided, which divides the melt conveying process of antimony-free polyester melt into various units, and establishes the melt conveying and The distribution mathematical model determines the weight relationship of the pressure drop, temperature rise, viscosity drop and residence time changes during the melt delivery process, thereby optimizing the melt delivery and distribution process, stabilizing the quality of the melt, and obtaining a highly stable and uniform melt body

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