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Polyester composition, preparation method therefor and use of polyester combination

A composition and polyester technology, applied in the field of polyester compositions, can solve the problems of low gelation rate, reduced polyester gelation rate, thermal cracking, etc., and achieve low gelation rate, easy operation and simple manufacturing process. Effect

Active Publication Date: 2016-06-15
TORAY FIBER RES INST(CHINA) CO LTD
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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, preparation method therefor and use of polyester combination

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preparation example Construction

[0031] A kind of preparation method of polyester composition is also disclosed in the present invention, comprises the following steps:

[0032] (1) Reaction of aromatic dicarboxylic acid or its esterified derivatives with aliphatic diols to obtain small molecular polymers, and then polycondensation reaction of small molecular polymers to obtain polyester chips, adding in the stage of preparing polyester chips Magnesium compounds or manganese compounds with a weight of 12-210ppm relative to the weight of polyester chips in terms of magnesium or manganese;

[0033] (2) Drying the polyester chip in step (1) and melt blending with the trivalent phosphorus compound, the amount of the trivalent phosphorus compound added is 660-11000ppm relative to the weight of the polyester composition in terms of phosphorus element.

[0034] The added amount of the magnesium compound or manganese compound is preferably 55-155 ppm relative to the weight of the polyester composition in terms of mag...

Embodiment 1

[0076] At 250°C, 166 parts by weight of terephthalic acid (TPA) and 72 parts by weight of ethylene glycol (EG) (that is, the molar ratio of EG to TPA is 1.15:1) were subjected to esterification reaction, through the by-product water Production capacity, when the esterification reaction rate reaches over 97%, transfer the obtained new diethylene terephthalate (BHT) oligomers to the polymerization tank. Add stabilizer trimethyl phosphate (TMPA) equivalent to 5-100ppm of the total amount of the polyester composition in terms of phosphorus to the polymerization tank in sequence, and add 0.5-100ppm of the total amount of the polyester composition in terms of lithium after 5 minutes. 20ppm regulator lithium acetate (LAH) and magnesium acetate equivalent to 210ppm of the total amount of the polyester composition in terms of magnesium elements, after 20 minutes, add catalyst trioxidation equivalent to 50-200% of the total amount of the polyester composition in terms of antimony element...

Embodiment 2

[0079] In the polycondensation stage, manganese acetate equivalent to 106 ppm of the total amount of the polyester composition in terms of manganese was added, and in the melt-kneading stage, PEP36 was added in terms of phosphorus, which was equivalent to 8250 ppm of the total amount of the polyester composition. Other steps are with embodiment 1.

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Abstract

The invention discloses a polyester composition and a preparation method therefor. The polyester composition is prepared through carrying out melt blending on polyester and a trivalent phosphorous compound. The polyester composition contains, relative to the total weight of the polyester composition, 10ppm to 200ppm of magnesium or manganese and 600ppm to 10,000ppm of phosphorus, and the gel ratio of the polyester composition is lower than 5wt% after the polyester composition is subjected to heat treatment at the temperature of 300 DEG C in a nitrogen-oxygen gas mixture, of which the oxygen gas concentration is 1%. The polyester composition can be applied to the field of films and the like.

Description

technical field [0001] The invention relates to a polyester composition with low gel ratio, a preparation method and application of the polyester composition. Background technique [0002] Polyesters, especially polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, etc., are widely used due to their excellent mechanical, physical and chemical properties Production of fibers, films and other molded products. However, most polyesters will undergo thermal oxygen degradation and thermal decomposition under high temperature conditions. In the thermal oxygen degradation reaction, oxygen radicals attack the hydrogen on the benzene ring of polyester to generate peroxide functional groups, which are unstable. It will also decompose to generate free radicals, and the generated free radicals serve as bridging points and the products of polyester thermal decomposition to form bridging structures, that is, cross-linking reactions occur to form infusible...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08K5/526C08K5/098C08K3/28C08K3/26C08K3/30C08J5/18
Inventor 单伯军望月克彦
Owner TORAY FIBER RES INST(CHINA) CO LTD
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