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Barrier polyester and preparation method thereof

A barrier and polyester technology, applied in the field of barrier polyester and its preparation, can solve the problems of short processing flow, affecting the physical and chemical properties of PET, low energy consumption, etc. Effect

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adding montmorillonite during polymerization, especially nanoscale montmorillonite with fine particle size, the barrier properties of PET can be improved to a certain extent, the processing flow is short and the energy consumption is low, but the added inorganic filler may affect Other physical and chemical properties of PET

Method used

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  • Barrier polyester and preparation method thereof

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preparation example Construction

[0016] The preparation method of the polyester provided by the present invention includes mixing terephthalic acid, ethylene glycol and a barrier comonomer, first performing an esterification reaction in the presence of a catalyst, and then performing a polycondensation reaction after heating up.

[0017] In the above method, the molar ratio of carboxyl group and hydroxyl group in terephthalic acid, ethylene glycol and barrier comonomer, that is, the molar ratio of total carboxyl group and total hydroxyl group contained in the reactant is 1: 1.0~1.8, preferably 1: 1.1~ 1.5.

[0018] The molar percentage of hydroxyl and carboxyl groups (the sum of the two) provided by the barrier comonomer to the total hydroxyl and total carboxyl groups (the sum of the two) of the reactant is 0.5-10 mol%, preferably 0.5-5 mol%.

[0019] The preparation method of the barrier polyester provided by the present invention is divided into two steps. The first step is an esterification reaction betwee...

example 1

[0025] Add 415.0g (2.50mol) of terephthalic acid, 184.1g (2.97mol) of ethylene glycol, 4.44g (0.03mol) of 3,5-dihydroxyhexanoic acid and 0.2g of catalyst antimony acetate into the autoclave, and use nitrogen Replace the gas in the kettle twice. The esterification reaction was carried out at 230° C. for 2 hours under a pressure of 0.1 MPa and stirring. The temperature was raised to 280°C, and a polycondensation reaction was carried out under reduced pressure for 2 hours. The polyester product was collected, and its properties were shown in Table 1, and the polyester contained 0.8% by mass of 3,5-dihydroxyhexanoic acid.

example 2

[0027] 415.0g (2.50mol) of terephthalic acid, 180.4g (2.91mol) of ethylene glycol, 13.32g (0.09mol) of 3,5-dihydroxyhexanoic acid and 0.2g of catalyst antimony acetate were added to the autoclave, and nitrogen was added to the reactor. Replace the gas in the kettle twice. The esterification reaction was carried out at 230° C. for 1 hour under a pressure of 0.1 MPa and stirring. The temperature was raised to 280°C, and the polycondensation reaction was carried out under reduced pressure for 1 hour. The polyester product was collected, and its properties are shown in Table 1. The polyester contained 2.2% by mass of 3,5-dihydroxyhexanoic acid.

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Abstract

The invention relates to a barrier polyester, which comprises terephthalic acid, ethylene glycol and a barrier comonomer. The barrier comonomer is a hydroxycarboxylic acid compound containing at least two substitutional groups or a benzoic acid derivative. The substitutional groups are selected from hydroxyl or carboxyl, but are not carboxyl at the same time. The barrier polyester is non-toxic, and has excellent mechanical properties, especially good barrier property for oxygen, as well as low oxygen penetration rate.

Description

technical field [0001] The present invention relates to a barrier polyester and a preparation method thereof, in particular, to a barrier polyethylene terephthalate. Background technique [0002] Polyethylene terephthalate (PET) is a crystalline thermoplastic resin with excellent properties. It has ideal chemical stability, mechanical properties, heat resistance, hygienic properties and environmental protection properties. In addition to fiber, it is also widely used in the production of bottle and film packaging materials, and in recent years, the application of PET in the packaging field has increased rapidly. However, as a packaging material, PET has an obvious deficiency, that is, it has no effect on O 2 , CO 2 The barrier properties of small molecular gases with strong isotonicity are not ideal, especially O 2 , Due to the small molecular size, the PET packaging material has poorer barrier properties, which often easily leads to the decrease in the taste of the packa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/86
Inventor 周涵代振宇赵晓光任强赵毅王丽新石灵娟张丽伟房韡张慧刘金凤
Owner CHINA PETROLEUM & CHEM CORP
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