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Polyester film and its preparation method

A polyester film and polyester technology, which is applied in the field of polyester film and its preparation, can solve the problems of difficulty in controlling the shrinkage rate of polyester film and the like

Active Publication Date: 2015-12-09
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to provide a polyester film and its preparation method to solve the technical problem that the shrinkage rate of the existing polyester film is difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] It can be seen from the background technology that the existing polyester film has the technical problem that the shrinkage rate is difficult to control. The inventors of the present invention have studied the above problem and proposed a polyester film and a preparation method. The polyester film is obtained by mixing and extruding polyester raw materials, wherein the polyester raw materials include: 60%-95% polyethylene terephthalate and 5%-40% alcohols by weight Or carboxylic acid modified copolyester, wherein the alcohol or carboxylic acid modified copolyester is polyethylene terephthalate modified by copolymerization of modifier.

[0022] In the above-mentioned polyester film of the present invention, polyethylene terephthalate is used as a raw material, and by adjusting the type and content of the added alcohols or carboxylic acids modified copolyester, the prepared polyester The purpose of regulating the shrinkage of the film. The mechanism is: when the polyeste...

Embodiment 1-1

[0035] Get 47.5Kg polyethylene terephthalate (produced by BASF, Germany, model is B4300G10, intrinsic viscosity is 0.7dl / g), 2.5Kg1,4-cyclohexanedimethanol modified copolyester (intrinsic viscosity 0.63dl / g, of which the quality of the modifier 1,4-cyclohexanedimethanol is 0.125Kg), mixed evenly and pre-crystallized, dried, sent to the extruder to melt and plasticize, and then passed through the die Thick sheets are extruded, and finally cooled with a casting roll at 30°C.

[0036] The film obtained in the above steps is preheated at 80°C after passing through the peeling roller, and then stretched longitudinally by 0.5 times at 100°C, the stretching speed is controlled at 1000mm / min, and then cooled at 60°C to obtain the film .

[0037] Clamp both sides of the film after longitudinal stretching with film clips, send it into a hot box, preheat it at 120°C, and then carry out 4 times of transverse stretching, and the stretching speed is controlled at 1000mm / min , and finally ...

Embodiment 1-2

[0039] Get 45Kg polyethylene terephthalate (produced by BASF, Germany, model is B4300G10, intrinsic viscosity is 0.7dl / g) and 5Kg1,4-cyclohexanedimethanol modified copolyester (intrinsic viscosity is 0.75 dl / g, wherein the quality of the modifier 1,4-cyclohexanedimethanol is 0.5Kg) as the polyester raw material, and the rest of the steps are the same as in Example 1-1, and finally the polyester film sample 1-2 is obtained.

[0040] test:

[0041] The obtained polyester film samples 1-1 and 1-2 were kept in a constant temperature water bath at 85° C. for 10 seconds, their length changes were measured, and their thermal shrinkage rates were calculated. The test results show that the heat shrinkage rate of sample 1-1 is 15%, and the heat shrinkage rate of sample 1-2 is 24%.

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PUM

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Abstract

The invention discloses a polyester film and a preparation method thereof. The polyester film is obtained by mixing and squeezing a polyester raw material. The polyester raw material comprises the following components in percentage by weight: 60-95% of polyethylene glycol terephthalate and 5-40% of alcohol or carboxylic acid modified copolyester, wherein the alcohol or carboxylic acid modified copolyester is polyethylene glycol terephthalate copolymerized and modified by a modifier. The purpose of regulating the shrinking percentage of the prepared polyester film can be realized by adjusting the type and content of alcohol or carboxylic acid modified copolyester in the polyester raw material, so that the polyester film can be applied to product packaging.

Description

technical field [0001] The invention relates to the technical field of packaging material preparation, in particular to a polyester film and a preparation method thereof. Background technique [0002] Heat-shrinkable film refers to the packaging material that shrinks the film after heating, so that the film is tightly attached to the product. At present, common heat-shrinkable films include polystyrene (PS), polyvinyl chloride (PVC), and polyvinylidene chloride (PVDC). Among them, PS film has been rarely used due to its low strength and impact resistance; since PVC and PVDC heat shrinkable films do not meet environmental protection requirements, their use in the packaging field, especially food packaging, has been banned in Europe and the United States. [0003] Polyester film is a new type of heat-shrinkable packaging material. It has the advantages of easy recycling, non-toxic, odorless, and high mechanical strength. It has become an ideal substitute to replace the existi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02B29C69/02B29C47/92B29C55/14B29B13/06B29B15/00B29L7/00B29C48/92
CPCB29C48/08
Inventor 罗欣韩朝阳盛平厚张雷何洋洋
Owner CHINESE TEXTILE ACAD