Modified polyester and preparation method thereof

A modified polyester and copolymerization technology, which is applied in the field of modified polyester and its preparation, can solve the problems of high brittleness, easy fracture, and low yield of PET film, and achieve the goal of reducing brittleness, reducing cost, and increasing yield Effect

Active Publication Date: 2013-03-13
WEIFANG FUWEI PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned modification methods can all prepare PET films with high shrinkage rate, the obtained PET films are relatively brittle and prone to breakage during production or use as bottle labels, resulting in low yield

Method used

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  • Modified polyester and preparation method thereof
  • Modified polyester and preparation method thereof

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preparation example Construction

[0022] The present invention also provides a kind of preparation method of modified polyester, comprises the following steps:

[0023] Mix isophthalic acid, neopentyl glycol, 1,4-cyclohexanedimethanol, terephthalic acid and ethylene glycol, and carry out esterification reaction at 240°C~280°C to obtain esterified products;

[0024] The temperature of the esterification product is raised to 250° C. to 290° C. to carry out polycondensation reaction to obtain a modified polyester.

[0025] The invention uses terephthalic acid and ethylene glycol as raw materials and isophthalic acid, neopentyl glycol and 1,4-cyclohexanedimethanol as modifiers to prepare modified polyester. In the present invention, firstly, isophthalic acid, neopentyl glycol, 1,4-cyclohexanedimethanol, terephthalic acid and ethylene glycol are mixed, and the esterification reaction is carried out at 240°C to 280°C. In the present invention, after heating the esterification tank to 240°C, add isophthalic acid, ne...

Embodiment 1

[0039] Add 91.2g of terephthalic acid, 8.8g of isophthalic acid, 87.14g of ethylene glycol, 9.6g of neopentyl glycol and 3.26g of 1,4-cyclohexanedimethanol into the slurry configurer, stir well to obtain a reaction mixture ; After raising the temperature of the esterification reaction kettle to 250°C, add the above-mentioned reaction mixture into it, raise the temperature and start stirring, control the temperature of the kettle between 240°C and 280°C, add the blueness agent, and slowly release the generated esterification reaction product; Add the above esterification reaction product into the polycondensation kettle, raise the temperature to 260°C and start slowly vacuuming, and finally carry out the high-vacuum polycondensation reaction between 250°C and 290°C, and stir the polycondensation reaction at the same time. The stirring process is as follows: first, at 50HZ, Stir under the condition of 0.6kW. When it reaches 2.1kW, reduce it to 35HZ and continue stirring. When it ...

Embodiment 2

[0044] Add 87g of terephthalic acid, 13g of isophthalic acid, 85g of ethylene glycol, 5g of neopentyl glycol and 10g of 1,4-cyclohexanedimethanol into the slurry configurer, and stir evenly to obtain a reaction mixture; After the temperature of the kettle is raised to 250°C, add the above-mentioned reaction mixture into it, raise the temperature and start stirring, control the temperature of the kettle between 240°C and 280°C, add the blueness agent, and slowly release the generated esterification reaction product; the esterification reaction product Add it into the polycondensation kettle, raise the temperature to 260°C and start to vacuumize slowly, and finally carry out high-vacuum polycondensation reaction between 250°C and 290°C, and stir while polycondensation reaction. The stirring process is as follows: first, under the conditions of 50HZ and 0.6kW Stir, when it reaches 2.1kW, reduce to 35HZ and continue stirring, when it reaches 2.0KW, reduce to 25HZ, when the stirring...

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Abstract

The invention provides modified polyester obtained by copolymerizing isophthalic acid, neopentyl glycol, 1,4-cyclohexanedimethanol, terephthalic acid and ethylene glycol. The modified polyester has the beneficial effects that isophthalic acid, neopentyl glycol and 1,4-cyclohexanedimethanol are taken as modifying agents to modify PET (polyethylene glycol terephthalate), that is, isophthalic acid, neopentyl glycol, 1,4-cyclohexanedimethanol, terephthalic acid and ethylene glycol are taken as raw materials to undergo copolymerization to obtain a PET copolymer; by using isophthalic acid, neopentyl glycol and 1,4-cyclohexanedimethanol as the modifying agents, not only can the shrinkage of the modified polyester be increased but also the fragility of the modified polyester can be reduced, so that the modified polyester can not be broken when serving as tags for bottles and the yield is increased; and results show that the shrinkage of the modified polyester film provided by the invention is over 60%, the longitudinal tensile strength is over 60MPa, the lateral tensile strength is over 200MPa, the longitudinal elongation at break is over 500% and the lateral elongation at break is over 50%.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a modified polyester and a preparation method thereof. Background technique [0002] Heat shrink film label is a film label printed on plastic film or plastic tube with special ink. With the increasing prosperity of the bottled beverage market, the demand for heat shrinkable film labels for bottles continues to expand, and the quality of demand continues to improve. At present, heat shrinkable films that can be used as shrink labels are mainly made of polyvinyl chloride (PVC), polystyrene (PS) or polyester, etc. Among them, polyvinyl chloride will cause environmental pollution, while polystyrene printability and Poor stability, polyester with excellent environmental protection and heat shrinkability has become the most advanced shrink packaging material. [0003] The most common polyester is polyethylene terephthalate (PET), which has excellent comprehensive propertie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/78
Inventor 王国明周慧芝
Owner WEIFANG FUWEI PLASTIC
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