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A kind of polyester composition and its preparation method and application

A composition and polyester technology, which are applied in the field of polyester compositions and their preparation, can solve the problems of insignificant regeneration inhibition effect of oligomer cyclic trimer, reduced content, and difficulty in execution, and achieve good regeneration inhibition effect. , Industrial simplicity, good hydrolysis resistance and heat resistance effect

Active Publication Date: 2020-04-07
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyester obtained by this method is easy to precipitate chelating agent, boron salt, etc. during the high-temperature processing in the later stage, and the regeneration inhibition effect on the specific oligomer cyclic trimer is not obvious
The second method is to reduce the content of the cyclic trimer in the polyester through solid-state polymerization or heat treatment under an inert gas, but this method can only reduce the content of the initial cyclic trimer in the polyester , cannot solve the problem of its regeneration in the subsequent high-temperature processing environment
There are also methods such as Chinese patent CN102421820A disclosing a kind of polytrimethylene terephthalate pellets with reduced oligomers. The preparation method is to use organic solvents to extract from polyester to remove cyclic trimers. This method Subsequent recovery of a large amount of organic solvents is required, the cost is high, the operation is troublesome, and it is difficult to implement in industry

Method used

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  • A kind of polyester composition and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] At a temperature of 250°C, 166 parts by weight of PTA and 71.3 parts by weight of EG were added to the esterification reactor, and the esterification reaction was carried out under normal pressure. When the esterification reaction was completed, the temperature in the esterification kettle was 250°C, Fractionate water to obtain small molecular polymers.

[0065] Add catalyst AO equivalent to 60 ppm by weight of the polyester composition in terms of antimony element, barium acetate equivalent to 200 ppm by weight of the polyester composition in terms of metal barium element, and equivalent to the polyester composition in terms of phosphorus element. The stabilizer PA with a weight of 30 ppm starts to depressurize and heat up after 5 minutes, the pressure is reduced to about 300 Pa after 1 hour, and the temperature rises to 290°C after 1.5 hours; when the polycondensation reaction is over, the pressure in the reactor is about 200 Pa. The obtained polymer was solid-phase poly...

Embodiment 2

[0068] At a temperature of 250°C, 166 parts by weight of PTA and 71.3 parts by weight of EG were added to the esterification reactor, and the esterification reaction was carried out under normal pressure. When the esterification reaction was completed, the temperature in the esterification kettle was 250°C, Fractionate water to obtain small molecular polymers.

[0069] Add catalyst AO equivalent to 20 ppm by weight of polyester composition based on antimony element, barium acetate equivalent to 200 ppm by weight of polyester composition based on metal barium element, and equivalent to polyester composition based on phosphorus element. The stabilizer PA with a weight of 30 ppm starts to depressurize and heat up after 5 minutes, the pressure is reduced to about 300 Pa after 1 hour, and the temperature rises to 290°C after 1.5 hours; when the polycondensation reaction is over, the pressure in the reactor is about 200 Pa. The obtained polymer was solid-phase polymerized at 220°C for ...

Embodiment 3

[0071] At a temperature of 250°C, 166 parts by weight of PTA and 71.3 parts by weight of EG were added to the esterification reactor, and the esterification reaction was carried out under normal pressure. When the esterification reaction was completed, the temperature in the esterification kettle was 250°C, Fractionate water to obtain small molecular polymers.

[0072] Add catalyst AO equivalent to 80 ppm by weight of the polyester composition in terms of antimony element, barium acetate equivalent to 400 ppm by weight of the polyester composition in terms of metal barium element, and equivalent to the polyester composition in terms of phosphorus element. The stabilizer PA with a weight of 100ppm starts to depressurize and heat up after 5 minutes, the pressure is reduced to about 300 Pa after 1 hour, and the temperature rises to 290°C after 1.5 hours; when the polycondensation reaction is over, the pressure in the reactor is about 200 Pa. The obtained polymer was further solid-ph...

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Abstract

The invention discloses a polyester composition with low cyclic trimer generation speed, and excellent heat resistance and hydrolysis resistance, and a preparation method thereof. The polyester composition contains 10 to 100ppm of stibium element and 10 to 400ppm of barium element based on the total amount of the polyester composition, and 0.2 to 0.8wt% of a cyclic trimer. Generation speed of the cyclic trimer in the polyester composition in melting at 300 DEG C in nitrogen ranges from 0.001 to 0.015wt% / min; the hydrolysis resistance index of the polyester composition deltaCOOH is less than or equal to 45eq / t; the heat resistance index %BB is less than or equal to 0.9%; and the polyester composition can be used for producing polyester products such as thin films.

Description

Technical field [0001] The invention relates to a polyester composition and a preparation method and application thereof, and more specifically, to a polyester composition with low cyclic trimer content and good hydrolysis resistance. Background technique [0002] Polyester, especially polyethylene terephthalate (PET), polytrimethylene terephthalate (PPT), polybutylene terephthalate (PBT), due to its excellent mechanical properties, chemical Characteristic, dimensional stability and transparency, it is widely used in fiber, film, resin and other fields. [0003] Generally, oligomers are inevitably produced as by-products in the polymerization process of polyester, and their amount generally accounts for about 2wt% of the total polyester. The oligomer mainly refers to polymerized monomers, dimers, cyclic trimers, etc., among which cyclic trimers account for the majority, accounting for about 1% by weight of the total polyester. Oligomers will pollute some components of the equipme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08G63/183C08G63/86
Inventor 祁华左文艳望月克彦
Owner TORAY FIBER RES INST(CHINA) CO LTD
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