Thermal contracting polyester film and method for preparing same

A polyester film and heat shrinking technology, applied in the field of heat shrinkable polyester film, can solve the problems of unsuitable heat shrinkage modification, reduce crystallization rate, etc., and achieve excellent heat shrinkage effect, low cost, and cost reduction effect.

Inactive Publication Date: 2008-03-05
FAR EASTERN NEW CENTURY COPRRATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as described hereinafter, the applicant's actual experiments have learned that the addition of NPG-modified PET copolyester is not as effective as the modification of CHDM in reducing the crystallization rate, so the polyester film of NPG-modified The heat shrinkage rate generally does not exceed 50%, and it is not suitable for heat shrinkage modification alone, so it is necessary to add other modifiers to make the shrinkage rate reach more than 50%.

Method used

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  • Thermal contracting polyester film and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] I. Preparation of Modified Copolyesters

[0069] Pour terephthalic acid, ethylene glycol, and 1,3-dihydroxy-2-methylpropane in a molar ratio of 1:0.998:0.249 into a stirring tank and stir to form a paste, and add 75ppm of heat stabilizer ( Phosphoric acid), and then pour the paste into the esterification tank, heat up and stir, and carry out the esterification reaction at the same time, which lasts 6 to 7 hours, and the pressure in the tank is controlled at 3kg / cm 2 Within the same time, let the water generated by the reaction be distilled and collected through the rectification tube. The final temperature of the esterification end is 250°C, and then the esterified product in the reaction tank is transferred to the condensation reaction tank, and 300ppm of antimony trioxide and 50ppm of cobalt acetate are added as catalysts, and the temperature is gradually raised to 285°C, and within 2 hours Vacuum to about 1torr. Until the intrinsic viscosity (intrinsic viscosity, I...

Embodiment 2

[0084] I. Preparation of Modified Copolyesters

[0085] The copolyester of the present embodiment is prepared in the same manner as in Example 1, except that the molar ratio of terephthalic acid, ethylene glycol and 1,3-dihydroxy-2-methylpropane is 1: 1.05: 0.20. And the obtained modified PET copolyester has a melting point of 206.52° C. and a crystallization temperature of 133.49° C. in the heating curve.

[0086] II. Production of heat-shrinkable polyester film

[0087] Eight heat-shrinkable polyester film samples were prepared in the same manner as in Example 1, Part II.

[0088] III. Shrinkage test of heat-shrinkable polyester film

[0089] Heat shrinkage test method: Same as the above-mentioned JIS Z1709 standard.

[0090] Test Results :

[0091] As shown in Table 4, except that the shrinkage rate of sample 5 is almost 0 because it is not stretched, the shrinkage rate of the other samples is distributed between 51-67%, which means that the heat shrinkable film of t...

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Abstract

The present invention reveals one kind of heat shrinking polyester film prepared with one kind of modified copolyester. The modified copolyester is polymer of one composition comprising terephthalic acid, ethylene glycol, and one first modifier for destroying crystallinity. The modified copolyester has glass transition temperature within 40-85 deg.c. The first modifier is 1, 3-dihydroxy-2-methyl propane, 1, 3- dihydroxy-2- methyl propane alkoxy ester and / or 2, 5-dimethyl-2, 5-hexadiol. The present invention also reveals process of preparing the heat shrinking polyester film with sheet of the modified copolyester and through stretching, cooling and curing.

Description

technical field [0001] The present invention relates to a heat-shrinkable polyester film, in particular to a heat-shrinkable polyester film made of modified polyethylene terephthalate, and The preparation method of the heat-shrinkable polyester film. Background technique [0002] It is known that polyvinyl chloride (PVC) is widely used to make heat shrinkable films for packaging and labels due to its good heat shrinkability, which can meet the packaging requirements of containers of various shapes, but its light and heat stability is poor Moreover, the thermal decomposition product contains a carcinogen recognized by the medical profession, that is, dioxin. Therefore, some European countries have banned the use of PVC materials by law, especially for packaging food and medicine. [0003] Polyester is also widely used because of its good mechanical, optical and printing properties. When it is made into the outer label of PET beverage bottles, it can be recycled together with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L67/03C08K5/05
CPCC08G2280/00C08G63/183C08J2367/02C08J5/18
Inventor 刘邦锦吴志恒褚智伟吴汝瑜
Owner FAR EASTERN NEW CENTURY COPRRATION
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