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A kind of polyester composition and its production method and application

A manufacturing method and composition technology, applied in the field of polyester composition and its manufacturing, can solve the problem that the regeneration inhibition effect of specific oligomer cyclic trimer is not obvious, the content of polyester cyclic trimer is reduced, and it is difficult to implement and other problems, to achieve the effect of good regeneration inhibition effect, industrial simplicity and excellent heat resistance.

Active Publication Date: 2018-05-29
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, a part of the cyclic trimer is removed by mixing the polyester with a chelating agent, boron salt, and amino compound, but the polyester obtained by this method is not processed by the chelating agent, boron salt, etc. Easy to precipitate, and the regeneration inhibitory effect on the specific oligomer cyclic trimer is not obvious
For another example, the obtained polyester is subjected to solid-state polymerization or heat treatment under inert gas to reduce the content of cyclic trimers in polyester, but this method can only reduce the content of initial cyclic trimers in polyester , cannot solve the problem of its regeneration in the subsequent high-temperature processing environment
Another method is to use organic solvents to extract from polyester to remove cyclic trimers, but this method needs to recover a large amount of organic solvents, which is costly, troublesome to operate, and difficult to implement in industry

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 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 reactor was 250°C. Fractional distillation of water yields small molecule polymers.

[0048] Add the polycondensation reaction catalyst AO that is equivalent to polyester weight 70ppm in terms of antimony element in gained small molecule polymer, the stabilizer PA that is equivalent to copolyester weight 100ppm in phosphorus element, start decompression, heat up after 5min, pressure passes through The pressure is reduced to about 300Pa in 1 hour, and the temperature rises to 290°C after 1.5 hours; when the polycondensation reaction ends, the pressure in the reactor is about 200Pa. The obtained polymer was subjected to solid state polymerization at 230° C. for 20 hours to obtain polyester chi...

Embodiment 2

[0051] 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 reactor was 250°C. Fractional distillation of water yields small molecule polymers.

[0052] Add the polycondensation reaction catalyst AO that is equivalent to polyester weight 110ppm in terms of antimony element in gained small molecule polymer, be equivalent to the stabilizer PA of copolyester weight 100ppm in phosphorus element, start decompression, heat up after 5min, pressure passes through The pressure is reduced to about 300Pa in 1 hour, and the temperature rises to 290°C after 1.5 hours; when the polycondensation reaction ends, the pressure in the reactor is about 200Pa. The obtained polymer was solid-state polymerized at 230° C. for 20 hours to obtain polyester chips with an intrin...

Embodiment 3

[0055] 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 reactor was 250°C. Fractional distillation of water yields small molecule polymers.

[0056] Add the polycondensation reaction catalyst AO that is equivalent to polyester weight 195ppm in terms of antimony element in gained small molecule polymer, be equivalent to the stabilizer PA of copolyester weight 70ppm in phosphorus element, start to decompress after 5min, heat up, pressure passes through The pressure is reduced to about 300Pa in 1 hour, and the temperature rises to 290°C after 1.5 hours; when the polycondensation reaction ends, the pressure in the reactor is about 200Pa. The obtained polymer was solid-state polymerized at 230° C. for 20 hours to obtain polyester chips with an intrins...

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Abstract

The invention discloses a polyester composition with low cyclic trimer content and a manufacturing method thereof. The method is mainly obtained by treating polyester chips in an aqueous chelating agent solution with a mass concentration of 5% to 50% at 60°C to 180°C for more than 0.5 hours, and the content of the cyclic trimer in the obtained polyester composition is 0.2 ~0.6wt%, and the regeneration rate of the cyclic trimer in the polyester composition is very low, and the generation rate of the cyclic trimer is 0.001-0.02wt% / min when melting at 300°C under nitrogen, which can be applied to Polyester products such as films.

Description

technical field [0001] The present invention relates to a polyester composition and its production method and application, more specifically, to a polyester composition with low cyclic trimer content. Background technique [0002] Because of its excellent properties, polyester, especially polyethylene terephthalate (PET), polytrimethylene terephthalate (PPT), polybutylene terephthalate (PBT), because of its excellent Excellent mechanical properties, chemical properties, dimensional stability and transparency, widely used in fiber, film, resin and other fields. [0003] Usually, the by-product of oligomer is unavoidably produced during the polymerization process of polyester, and its amount generally accounts for about 2wt% of the total amount of polyester. The oligomers mentioned here mainly refer to monomers, dimers, trimers, etc., among which cyclic trimers account for the vast majority, which is about 1wt% of the total polyester. Oligomers will contaminate some componen...

Claims

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Application Information

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