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Polyester composition and preparation method and application thereof

A composition and polyester technology, applied in the field of polyester composition and its preparation, can solve the problems of low gel inhibition stability, insufficient gel inhibition, and polyester heat resistance degradation, etc., and achieve regeneration inhibition effect. Good, excellent heat resistance, low gel rate

Inactive Publication Date: 2017-04-05
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Japanese Patent Laid-Open 2005-314643 and Japanese Patent Laid-Open 2006-225621 describe that gelation can be suppressed to some extent by adding a titanium compound in the oligomerization process such as transesterification, but the heat resistance of polyester itself Decrease, thermal cracking will occur during long-term film production and cannot fully inhibit the generation of gel
Also disclosed in Chinese patent CN98108099.5 is another method that can reduce the gel rate of polyester, that is, adding a copolyester with intermediary groups in the main chain to the polyester, and making the two form phase separation , and then by controlling the dispersed domain shape of the aforementioned copolyester, a polyester with a lower gel rate can be obtained, but the process conditions of this method are relatively complicated, and the stability of gel inhibition is not high

Method used

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  • Polyester composition and preparation method and application thereof

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preparation example Construction

[0026] The present invention also discloses the preparation method of the above-mentioned polyester composition. Firstly, a small molecule is obtained by reacting an aromatic dicarboxylic acid or its esterified derivative with an aliphatic dihydric alcohol, and then the small molecule polymer is polymerized to obtain a polyester, and finally Carrying out solid-phase polymerization of polyester to obtain a polyester composition; adding a catalyst antimony compound, a stabilizer phosphorus compound and a sulfur-based antioxidant in the polycondensation reaction stage, wherein the addition amount of the antimony compound is 30% relative to the polyester composition in terms of antimony ~100ppm, the addition amount of phosphorus compound is 20-200ppm relative to the polyester composition in terms of phosphorus element, and the addition amount of sulfur-based antioxidant is 75-750ppm in terms of sulfur element relative to the polyester composition.

[0027] The sulfur-based antioxid...

Embodiment 1

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

[0072] Add the catalyst AO that is equivalent to 60ppm of polyester composition weight in terms of antimony element in the gained small molecular polymer, is equivalent to the magnesium acetate of polyester composition weight 500ppm, is equivalent to the stabilizer of 40ppm polyester composition weight in phosphorus element. Agent PA, and dilauryl thiodipropionate (DLTP) of 200ppm relative to the weight of the polyester composition in terms of sulfur element. After 5 minutes, the pressure was reduced and the temperature was raised. The pressure was reduced to about 300Pa after 1 hour, and the temperature was...

Embodiment 2

[0076] 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.

[0077] Add the catalyst AO that is equivalent to 30ppm of polyester composition weight in terms of antimony element in the gained small molecule polymer, be equivalent to the manganese acetate of polyester composition weight 700ppm, be equivalent to the stabilizer of 60ppm polyester composition weight in phosphorus element. Agent PA, and dialkyl thiodipropionate (800) of 150ppm relative to the weight of the polyester composition in terms of sulfur element, decompression and temperature rise were started after 5min, and the pressure was decompressed to about 300Pa after 1 hour, and the temperature was After ...

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Abstract

The invention discloses a polyester composition low in cyclic trimer content, low in cyclic trimer growth speed and low in gel rate, and a preparation method thereof. The polyester composition comprises the element stibium with the concentration being 30-100 ppm relative to the total quantity of the polyester composition, and the element phosphorus with the concentration being 20-200 ppm relative to the total quantity of the polyester composition. The polyester composition further comprises a sulphur system antioxidant with the concentration, measured by the element sulphur, being 75-750 ppm relative to the polyester composition. The content of cyclic trimer in the polyester composition ranges from 0.2 wt% to 0.8 wt%. When the polyester composition is molten at the temperature being 300 DEG C under nitrogen, the generation speed of the cyclic trimer in the polyester composition is 0.015 wt% / min or lower, and the gel rate of the polyester composition is 5 wt% or lower. The polyester composition can be applied to polyester products such as thin films.

Description

technical field [0001] The present invention relates to a polyester composition and its preparation method and application, more specifically, to a polyester composition with low cyclic trimer content, good inhibition effect on cyclic trimer melt regeneration, and low gel rate substances and their preparation methods and uses. Background technique [0002] Polyester, especially polyethylene terephthalate (PET), polytrimethylene terephthalate (PPT), polybutylene terephthalate (PBT), because of its excellent mechanical properties, chemical Characteristic, dimensional stability and transparency, widely used in fiber, film, resin and other fields. [0003] Generally, by-product oligomers are unavoidably produced during the polymerization of polyester, and their amount generally accounts for about 2wt% of the total amount of polyester. Said oligomers mainly refer to polymerized monomers, dimers, cyclic trimers, etc., among which cyclic trimers account for the vast majority, acc...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/86C08L67/02C08K5/372
Inventor 左文艳祁华望月克彦
Owner TORAY FIBER RES INST(CHINA) CO LTD