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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 low yield, easy to break, and high brittleness of PET film, etc., to improve yield, reduce brittleness, and increase shrinkage Effect

Active Publication Date: 2015-04-01
WEIFANG FUWEI PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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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, 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 and 1,4-cyclohexanedimethanol as modifiers to prepare modified polyester. In the present invention, firstly, isophthalic acid, 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 the esterification kettle is heated to 240°C, isophthalic acid, 1,4-cyclohexanedimethanol, terephthalic acid and ethylen...

Embodiment 1

[0039] Add 91.2g of terephthalic acid, 8.8g of isophthalic acid, 87.14g of ethylene glycol and 12.86g of 1,4-cyclohexanedimethanol into the slurry configurer, stir evenly to obtain a reaction mixture; raise the temperature of the esterification reaction kettle After reaching 250°C, add the above reaction mixture to 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 formed esterification reaction product; add the esterification reaction product to In the polycondensation kettle, heat up to 260°C and start slowly vacuuming, 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, stir under the conditions of 50HZ and 0.6kW , when it reaches 2.1kW, reduce to 35HZ and continue stirring, when it reaches 2.0KW, reduce to 25HZ, when the stirring frequency reaches 1.8KW, ...

Embodiment 2

[0044] Add 87g of terephthalic acid, 13g of isophthalic acid, 85g of ethylene glycol and 15g of 1,4-cyclohexanedimethanol into the slurry configurer and stir evenly to obtain a reaction mixture; after the esterification reaction kettle is heated to 250°C Add the above reaction mixture to 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 esterification reaction product 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. When kW is reduced to 35HZ to continue stirring, when it reaches 2.0KW, it is reduced to 25HZ, and when the stirring frequency reaches 1.8KW, stop stirring; use nitrogen to increase the pressure of the polycondensation tank to 0.2MPa, open t...

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Abstract

The invention provides modified polyester obtained by copolymerizing isophthalic acid, 1,4-cyclohexanedimethanol, terephthalic acid and ethylene glycol. The modified polyester has the beneficial effects that isophthalic acid and 1,4-cyclohexanedimethanol are taken as modifying agents to modify PET (polyethylene glycol terephthalate), that is, isophthalic acid, 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 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 Patents(China)
IPC IPC(8): C08G63/183C08G63/78
Inventor 王国明周慧芝
Owner WEIFANG FUWEI PLASTIC