Polyester melt and its preparation method

A technology of polyester melt and precondensation, which is applied in the field of chemical fiber, can solve the problems of poor quality of polyester melt, poor thermal stability, yellow color value, etc. The effect of thermal stability

Active Publication Date: 2021-08-13
YINGKOU KANGHUI PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the existing PET (polyethylene terephthalate) film-grade melt production process, there are continuous five-pot process and semi-continuous three-pot process, and the control range of product indicators is relatively large. The obtained polyester Melt quality is poor, such as intrinsic viscosity controlled at [η] ± 0.01, high carboxyl end group and high color value, etc., especially when producing 4.5μm ultra-thin films on the BOPET (polyester film) 8.7-meter direct melting production line, broken High film rate, yellowish color value, high haze, poor thermal stability, etc.

Method used

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  • Polyester melt and its preparation method
  • Polyester melt and its preparation method

Examples

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preparation example Construction

[0076] The preparation method of polyester melt as above may further comprise the steps:

[0077] Mix purified terephthalic acid, ethylene glycol, catalyst, sodium ion modifier and color tone modifier for the first esterification reaction, then add diethylene glycol, phosphorus-containing organic compound stabilizer and magnesium ion modifier The second esterification reaction is carried out, and then the first precondensation reaction, the second precondensation reaction and the final polycondensation reaction are carried out in sequence to obtain a polyester melt.

[0078] The present invention adopts the five-pot process, which can effectively avoid the shortcomings of the semi-continuous three-pot process due to the large control range of product indicators (such as intrinsic viscosity controlled at [η] ± 0.010), high carboxyl end groups, and high color value, which cannot meet the BOPET requirements. The demand for 4.5μm ultra-thin films produced by the 8.7-meter direct m...

Embodiment 1

[0121] A polyester melt, mainly prepared from the following raw materials: purified terephthalic acid, ethylene glycol, diethylene glycol, antimony acetate and triethyl phosphoroacetate;

[0122] Among them, in parts by mass, 70 parts of purified terephthalic acid, 18 parts of ethylene glycol, 0.8 parts of diethylene glycol and 0.1 part of antimony acetate;

[0123] The concentration of triethyl phosphoroacetate is 75ppm;

[0124] The viscosity of the polyester melt is 0.640 dL / g.

[0125] Such as figure 1 Shown, the preparation method of described polyester melt, comprises the following steps:

[0126] (a) In the slurry mixing tank, according to a certain proportion, prepare the slurry with purified terephthalic acid, ethylene glycol and antimony acetate, transport it into the first esterification tank through the supply pump, and carry out mass transfer through the agitator Heat transfer, and then heated by the internal coil liquid-phase heat medium and the outer jacket v...

Embodiment 2

[0132] A polyester melt, mainly prepared from the following raw materials: purified terephthalic acid, ethylene glycol, diethylene glycol, ethylene glycol antimony and trimethyl phosphate;

[0133] Among them, in parts by mass, 87 parts of purified terephthalic acid, 35 parts of ethylene glycol, 2 parts of diethylene glycol and 0.6 parts of ethylene glycol antimony;

[0134] The concentration of the trimethyl phosphate is 200ppm;

[0135] The viscosity of described polyester melt is 0.660dL / g;

[0136] The preparation method of described polyester melt, comprises the following steps:

[0137] (a) In the slurry mixing tank, according to a certain ratio, prepare the slurry with purified terephthalic acid, ethylene glycol and ethylene glycol antimony, transport it into the first esterification tank through the supply pump, and carry out the process through the agitator. Mass transfer and heat transfer, and then heated by the internal coil liquid-phase heat medium and the outer ...

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Abstract

The invention belongs to the technical field of chemical fibers, in particular to a polyester melt and a preparation method thereof. The polyester melt in the present invention is mainly prepared from the following raw materials: purified terephthalic acid, ethylene glycol, diethylene glycol, catalyst and phosphorus-containing organic compound stabilizer; wherein, in parts by mass, it includes: 70-87 parts of purified terephthalic acid, 18-35 parts of ethylene glycol, 0.8-2 parts of diethylene glycol and 0.1-0.6 parts of catalyst; the concentration of the phosphorus-containing organic compound stabilizer is 75-200ppm; preferably , the viscosity of the polyester melt is 0.650±0.010dL / g, more preferably, the viscosity of the polyester melt is 0.650±0.005dL / g. The polyester melt has low oligomer content, less pure melt crystals, pure color and high transparency, meets the requirements of high-quality melt, and can enhance the thermal stability and mechanical properties of the polyester film.

Description

technical field [0001] The invention relates to the technical field of chemical fibers, in particular to a polyester melt and a preparation method thereof. Background technique [0002] In the existing PET (polyethylene terephthalate) film-grade melt production process, there are continuous five-pot process and semi-continuous three-pot process, and the control range of product indicators is relatively large. The obtained polyester Melt quality is poor, such as intrinsic viscosity controlled at [η] ± 0.01, high carboxyl end group and high color value, etc., especially when producing 4.5μm ultra-thin films on the BOPET (polyester film) 8.7-meter direct melting production line, broken High film rate, yellow color value, high haze, poor thermal stability and other problems. [0003] In view of this, the present invention is proposed. Contents of the invention [0004] An object of the present invention is to provide a kind of polyester melt, and this polyester melt is prepa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/672C08G63/78
CPCC08G63/672C08G63/78
Inventor 鞠培勇李振国
Owner YINGKOU KANGHUI PETROCHEM
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