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Modified PET (polyethylene terephthalate) copolymer for high-toughness heat-shrinkable film and preparation method of modified PET copolymer

A heat-shrinkable film and copolymer technology, applied in the field of polyester, can solve the problems of brittleness, high heat shrinkage, and restrictions on wide application, and achieve the effects of low production cost, improved toughness, and reduced cost

Active Publication Date: 2015-07-29
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing heat-shrinkable polyester film has high heat shrinkability in one direction
But in the other direction there is the problem of being prone to brittleness
Moreover, this problem limits its wide application

Method used

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  • Modified PET (polyethylene terephthalate) copolymer for high-toughness heat-shrinkable film and preparation method of modified PET copolymer
  • Modified PET (polyethylene terephthalate) copolymer for high-toughness heat-shrinkable film and preparation method of modified PET copolymer
  • Modified PET (polyethylene terephthalate) copolymer for high-toughness heat-shrinkable film and preparation method of modified PET copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] (1) On the daily production of 5 tons of small flexible modified polyester continuous polyester polycondensation production equipment, with terephthalic acid (PTA, containing 5wt% adipic acid), and ethylene glycol (containing 25wt% neopentyl glycol , 5wt% isosorbide), 250ppm catalyst—ethylene glycol antimony, a mixture of phthalic acid and adipic acid and a mixture of ethylene glycol, neopentyl glycol and isosorbide added in a molar ratio of 1:1.15; The time is 40 minutes; put it into the slurry supply tank for standby;

[0067] (2) The slurry obtained in step (1) is pumped into the first esterification reaction production still to carry out the esterification reaction. The esterification temperature is 255°C, the pressure is 2.5Kpa, and the flow rate is 200Kg / h; After the kettle, the esterification rate reaches 91-93%; it is pumped into the pipeline and passes through the syringe 1;

[0068] (3) Use syringe 1 to add antioxidant 1010 and trimethyl phosphate online; the...

Embodiment 2

[0073] (1) On the daily production of 5 tons of small flexible modified polyester continuous polyester polycondensation production equipment, with terephthalic acid (PTA, containing 10wt% adipic acid), and ethylene glycol (containing 30wt% neopentyl glycol , 10wt% isosorbide), 250ppm catalyst—ethylene glycol antimony, a mixture of phthalic acid and adipic acid and a mixture of ethylene glycol, neopentyl glycol and isosorbide are added in a molar ratio of 1:1.15; Time 30 minutes, put into the slurry supply tank for standby;

[0074] (2) Pump the slurry obtained in step (1) into the first esterification reaction production tank to carry out the esterification reaction. The esterification temperature is 255°C, the pressure is 3Kpa, and the flow rate is 180Kg / h. Make the esterification rate reach 91-93% after passing through the first esterification reaction kettle; pump it into the pipeline and pass through the syringe 1;

[0075] (3) Use syringe 1 to add antioxidant 1010 and tr...

Embodiment 3

[0080] (1) On the daily production of 5 tons of small flexible modified polyester continuous polyester polycondensation production equipment, with terephthalic acid (PTA, containing 2wt% adipic acid), and ethylene glycol (containing 15wt% neopentyl glycol , 2wt% isosorbide), 250ppm catalyst—antimony ethylene glycol, a mixture of phthalic acid and adipic acid and a mixture of ethylene glycol, neopentyl glycol and isosorbide are added in a molar ratio of 1:1.15; The time is 35 minutes; put it into the slurry supply tank for standby;

[0081] (2) pump the slurry obtained in step (1) into the first esterification reaction production still, carry out esterification reaction, the esterification temperature is 260 ℃, pressure 3Kpa, flow velocity is 190Kg / h; After the kettle, the esterification rate reaches 91-93%; it is pumped into the pipeline and passes through the syringe 1;

[0082] (3) Using syringe 1 to add antioxidant 1098 and triphenyl phosphate online; the addition of antio...

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Abstract

The invention relates to the field of polyester, particularly to a modified PET (polyethylene terephthalate) copolymer for a high-toughness heat-shrinkable film, a preparation method of the modified PET copolymer as well as the heat-shrinkable film prepared from the copolymer. The modified PET copolymer is formed by copolymerizing five monomers, namely, terephthalic acid, adipic acid, ethylene glycol, neopentyl glycol and isosorbide. According to the preparation method of the modified PET copolymer, continuous polymerization is performed on the basis of adoption of three-kettle short-process polyester continuous polymerization equipment. The modified copolymer obviously solves the problem of embrittlement of the PET heat-shrinkable film in another direction and improves the toughness of the heat-shrinkable film; the glass transition temperature of the prepared film is up to 76 DEG C, and the film has the higher heat resistance and meets requirements of some occasions with usage temperatures higher than 70 DEG C.

Description

technical field [0001] The invention relates to the polyester field, in particular to an amorphous modified ethylene terephthalate copolymer used for high-toughness shrinkage films, a preparation method thereof, and a heat-shrinkable film prepared by using the copolymer. Background technique [0002] Heat-shrinkable plastic films are widely used in shrink packaging, shrink labels and other applications by utilizing the property of heat shrinkage. Among them, stretched films such as polyvinyl chloride films are used for various containers such as polyethylene terephthalate (PET) containers, polyethylene containers, and glass containers as labels and lids for sealing or accumulation packaging. However, the polyvinyl chloride film has problems such as easily generating hydrogen chloride gas or becoming bis(8-hydroxyquinoline) due to its low heat resistance. Furthermore, once a heat-shrinkable polyvinyl chloride resin film is used as a shrink label for a PET container or the li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/78C08L67/02
Inventor 刘伯林金剑
Owner CHINESE TEXTILE ACAD
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