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Modified copolyester, thermal shrinkage polyester film produced thereby and method for preparing same

A technology of copolyester and polyester film, which is applied in the field of heat-shrinkable polyester film preparation, can solve the problems of not being able to meet the processing conditions of secondary blown film, low melting strength, and not particularly high molecular weight, and achieve excellent heat shrinkage effect , Improve melting strength, and low cost

Active 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

Conventional PET is still a linear polymer in structure even after the above-mentioned modified monomer is introduced, and the molecular weight of the general melt polymerization reaction is not particularly high, so that the melt strength is not high, and often cannot meet the requirements of the secondary blown film processing conditions

Method used

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  • Modified copolyester, thermal shrinkage polyester film produced thereby and method for preparing same
  • Modified copolyester, thermal shrinkage polyester film produced thereby and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] I. Preparation of Modified Copolyester with Addition of First Modifier and Branching Agent

[0079] Pour terephthalic acid, ethylene glycol, 1,3-dihydroxy-2-methylpropane, and 1,1,1-tris(hydroxymethyl)propane in a molar ratio of 1:0.998:0.249:0.003 and stir Stir in the tank to form a paste, and add 75ppm of heat stabilizer (phosphoric acid), 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. Control it within 3kg / cm2, while allowing the water generated by the reaction to distill out and collect through the rectifying 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 int...

Embodiment 2

[0093] I. Preparation of Modified Copolyesters

[0094] The copolyester of this embodiment is prepared in the same manner as in Example 1, except that isophthalic acid is further added as a second modifier, and terephthalic acid, isophthalic acid, ethylene glycol, 1 , the molar ratio of 3-dihydroxy-2-methylpropane to 1,1,1-tris(hydroxymethyl)propane is 1:0.053:1.118:0.197:0.003, and the measured Tg value is 74°C.

Embodiment 3

[0096] I. Second blown film to make heat-shrinkable polyester film

[0097]The PET copolyester obtained in Experimental Example 1 was dried at low temperature (60° C.) for more than 12 hours, and then added into an extruder (L / D=25, φ=65) (setting temperatures were 185° C., 190° C. ℃, 195℃; Die 1 temperature 180℃, Die 2 temperature 190℃), film blowing is carried out with two continuous film blowing machines, that is to say, it is carried out by dry stretching and cooling on the upper blowing ring, and then the film is wound up to the top Then it goes down and then stretched through an electric oven, and finally the stretched film is rewound. Among them, the extension temperature is set to three sections, respectively 110°C, 100°C, and 90°C. The width of the air ring (bubble 1) of the first blown film is 200mm, and the width of the air ring (bubble 2) of the second blown film is 400mm.

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Abstract

The present invention reveals one kind of modified copolyester, which is polymer of one composition comprising terephthalic acid, ethylene glycol, one first modifier for destroying crystallinity and one branch chain agent for strength melt strength. 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; and the branch chain agent is compound with at least three reactive radicals selected from OH, COOH, NCO, NH2, epoxy group and COOR, where, R is C1-C18 alkyl radical. The present invention also reveals process of preparing heat shrinking polyester film with sheet or film of the modified copolyester and through stretching, cooling and curing.

Description

technical field [0001] The present invention relates to a modified polyethylene terephthalate copolyester, a heat-shrinkable polyester film (heat-shrinkable polyester film) prepared by using the copolyester, and the heat-shrinkable polyester film Preparation. 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 toge...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/20C08G63/78C08J5/18
CPCC08G63/668C08G63/20C08J2367/00C08J5/18
Inventor 刘邦锦吴志恒钟振祥褚智伟吴汝瑜
Owner FAR EASTERN NEW CENTURY COPRRATION
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