Block copolyester and preparation method thereof, and barrier film and barrier bottle

A technology of block copolyester and polyethylene terephthalate, applied in the field of materials, can solve problems such as limiting the scope of application, and achieve the effect of excellent oxygen and carbon dioxide barrier properties

Inactive Publication Date: 2018-12-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

They all belong to aliphatic polymers. Due to the lack of rigid aromatic ring structure in the molecular structure, their mechanical properties (such as strength, modulus, creep resistance, etc.) and heat resistance (such as thermomechanical properties, heat distortion temperature, etc.) are obvious. It is lower than petroleum-based polymer materials such as polyethylene terephthalate (PET), polycarbonate (PC), aromatic nylon (PA), bisphenol A epoxy resin (Epoxy), which severely limits their application. Application range

Method used

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  • Block copolyester and preparation method thereof, and barrier film and barrier bottle
  • Block copolyester and preparation method thereof, and barrier film and barrier bottle
  • Block copolyester and preparation method thereof, and barrier film and barrier bottle

Examples

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preparation example Construction

[0030] The present invention provides a kind of preparation method of the block copolyester of formula (I) structure, comprising:

[0031] Polyethylene furandicarboxylate, polyethylene terephthalate, transesterification catalyst, stabilizer and antioxidant mixed reaction, obtain the block copolyester of formula (I) structure;

[0032]

[0033] Wherein, m is 20-200; preferably 50-150; n is 20-200; preferably 50-150; z is 10-200;

[0034] According to the present invention, the intrinsic viscosity of the block copolyester is preferably 0.45-1.0 dL / g; more preferably 0.48-0.9 dL / g; most preferably 0.55-0.85 dL / g.

[0035] The present invention at first provides the polyethylene furandicarboxylate of formula (II) structure and the polyethylene terephthalate of formula (III) structure; The present invention does not limit to its source, can be commercially available, also It can be prepared according to conventional methods in the prior art. The inventor does not limit this. ...

Embodiment 1

[0071] Add polyethylene furandicarboxylate with a degree of polymerization of 100, polyethylene terephthalate with a degree of polymerization of 150, and antimony trioxide into a 1000mL reactor at a molar ratio of 0.2:0.8:0.002, and add a stable agent and antioxidant, and gradually raised the temperature to 275°C, and controlled the vacuum degree below 200Pa to react for 3 hours to obtain polyfurandicarboxylic acid terephthalate block copolyester with an intrinsic viscosity of 0.76dL / g, FT-IR and 1 H-NMR spectrum such as figure 2 with image 3 as shown, figure 2 The FT-IR spectrum of the polyfurandicarboxylic acid terephthalate block copolyester obtained in Example 1 of the present invention; image 3 It is the 1H-NMR spectrum of the polyfurandicarboxylic acid terephthalate block copolyester obtained in Example 1 of the present invention. Through melt molding, a transparent film with a thickness of 100-200 μm is prepared, such as figure 1 as shown, figure 1 The photo of...

Embodiment 2

[0073] Add polyethylene furandicarboxylate with a degree of polymerization of 80, polyethylene terephthalate with a degree of polymerization of 160, and antimony trioxide into a 1000mL reactor at a molar ratio of 0.95:0.05:0.003, and add a stable agent and antioxidant, and gradually raise the temperature to 255°C, and control the vacuum degree below 200Pa to react for 3 hours to obtain polyfurandicarboxylic acid terephthalate block copolyester with an intrinsic viscosity of 0.80dL / g, which is formed by melt molding , to prepare a transparent film with a thickness of 100-200 μm, and the oxygen gas barrier property is 0.010×10 -10 cm 3 cm / cm 2 ·s·cmHg, carbon dioxide gas barrier property is 0.018×10 - 10 cm 3 cm / cm 2 ·s·cmHg.

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Abstract

The invention provides a block copolyester with a structure as shown in a formula (I) which is described in the specification. According to the invention, a novel poly(ethylene terephthalate furandicarboxylate) block copolyester is prepared by adding poly(furandicarboxylic acid) into polyethylene terephthalate through a transesterification reaction; compared with pure polyethylene terephthalate, the copolyester has excellent oxygen and carbon dioxide barrier properties, and solves the defects of short food shelf life and needing of a large number of preservatives due to poor barrier propertiesto gases like oxygen, or the defect of incapable recovery due to needing of a plurality of layers of composite films to improve the barrier properties to gases like the oxygen for a traditional polyethylene terephthalate polyester food packaging film. Experimental results show that the block copolyester provided by the invention has oxygen barrier properties increased by 20% to 400% compared withPET, and carbon dioxide barrier properties increased by 20% to 520% compared with the PET. The polyester barrier film and the barrier bottle prepared from the block copolyester provided by the invention can be used in the fields of food packaging, drug packaging, automobile, electronics, etc.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a block copolyester, a preparation method thereof, a barrier film and a barrier bottle. Background technique [0002] At present, the widely used bio-based polymer materials mainly include polylactic acid (PLA), polyhydroxy fatty acid (PHA), polyglycolic acid (PGA), polybutylene succinate (PBS) and so on. They all belong to aliphatic polymers. Due to the lack of rigid aromatic ring structure in the molecular structure, their mechanical properties (such as strength, modulus, creep resistance, etc.) and heat resistance (such as thermomechanical properties, heat distortion temperature, etc.) are obvious. It is lower than petroleum-based polymer materials such as polyethylene terephthalate (PET), polycarbonate (PC), aromatic nylon (PA), bisphenol A epoxy resin (Epoxy), which severely limits their application. application range. [0003] Therefore, it is necessary to develop a kin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00
CPCC08G81/00
Inventor 王静刚刘小青朱锦张传芝
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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