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A kind of 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., and achieve the goal of increasing the degree of crosslinking and reducing the oxygen transmission rate Effect

Active Publication Date: 2017-08-22
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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  • A kind of barrier polyester and preparation method thereof

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preparation example Construction

[0016] The preparation method of the polyester provided by the invention comprises mixing terephthalic acid, ethylene glycol and a barrier comonomer, 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 groups to hydroxyl groups in terephthalic acid, ethylene glycol and barrier comonomers, that is, the molar ratio of total carboxyl groups to total hydroxyl groups contained in the reactants is 1:1.0~1.8, preferably 1:1.1~ 1.5.

[0018] The mole percentage of the hydroxyl and carboxyl groups (the sum of the two) provided by the barrier comonomer to the total hydroxyl and carboxyl groups (the sum of the two) of the reactants 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 between small molec...

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. The gas in the kettle was replaced 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 the polycondensation reaction was carried out under reduced pressure for 2 hours. The polyester product was collected, and its properties are shown in Table 1. The polyester contained 0.8% by mass of 3,5-dihydroxyhexanoic acid.

example 2

[0027] Add 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 into the autoclave. The gas in the kettle was replaced 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 a polycondensation reaction was performed 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

A barrier polyester comprising terephthalic acid, ethylene glycol and a barrier comonomer, the barrier comonomer is a hydroxycarboxylic acid compound or a benzoic acid derivative having at least two substituents, the The substituents of are selected from hydroxyl or carboxyl, but not carboxyl at the same time. The barrier polyester is non-toxic and has excellent mechanical properties, especially good barrier property to oxygen and low oxygen transmission rate.

Description

technical field [0001] The 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 performance, which has ideal chemical stability, mechanical properties, heat resistance, hygienic performance and environmental protection performance. 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, there is an obvious deficiency in PET as a packaging material, that is, it is not suitable for O 2 , CO 2 The barrier properties of small molecular gases with strong isotonic permeability are not ideal, especially O 2 , due to the smaller molecular size, PET packaging materials have poorer barrier properties to them, which often easily leads to a decrease in...

Claims

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Application Information

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Patent Type & Authority Patents(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