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A kind of directly heat-sealable polyester film and preparation method thereof

A polyester film and a direct technology, applied in the field of polyester film and its preparation, can solve the problems of incapability of self-heat sealing and the like, and achieve the effects of saving compounding processes, preventing the existence of residual solvents, and saving use and waste

Active Publication Date: 2015-08-19
ZHEJIANG QIANGMENG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the defect that ordinary polyester film products in the prior art cannot be self-sealed. In order to be used in heat-sealed occasions, it usually requires cumbersome and costly compounding procedures with other resins, and provides a Heat sealing at a temperature of 120 degrees not only saves the tedious and costly compounding process of ordinary polyester film and other resins, saves the use and waste of resources, but also reduces the cost of the entire food packaging material, and is more hygienic. A kind of directly heat-sealable polyester film and preparation method thereof

Method used

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  • A kind of directly heat-sealable polyester film and preparation method thereof
  • A kind of directly heat-sealable polyester film and preparation method thereof
  • A kind of directly heat-sealable polyester film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030]A polyester film that can be directly heat-sealed, including an ABC three-layer structure, the B layer is the middle core layer, and the material is PET super-bright polyester chips; the A layer is the surface heat-sealing layer, and the material is copolymerized PETG Polyester chips; C layer is an anti-blocking layer, and the materials include PET anti-blocking agent masterbatch chips and PET super glossy polyester chips.

[0031] The anti-adhesion layer of layer C has the following components by mass percentage: 30%-60% of PET anti-adhesion agent masterbatch chips and 40%-70% of PET super-bright polyester chips.

[0032] The thickness of layer B accounts for 70% to 80%, the thickness of layer A accounts for 10% to 20%, and the thickness of layer C accounts for 10% to 20%.

[0033] The copolymerized PETG polyester chip of the heat-sealing layer on the surface layer of layer A is made of dimethyl terephthalate DMT, ethylene glycol EG, silicon dioxide SiO 2 And 1,4-cyclo...

Embodiment 2

[0051] A method for preparing a directly heat-sealable polyester film, in parts by weight: 22 parts by mass of 1,4 cyclohexanedimethanol CHDM and 3 parts by mass of silicon dioxide SiO 2 Add to 23 parts of ethylene glycol EG, stir and disperse, then homogenize through high-speed dispersion, and use ultrasonic vibration to disperse, then send it to the polymerization kettle of the main reaction system; add 100 parts of dimethyl terephthalate DMT to stir and mix, Then add 2 parts (PTA weight) of antimony trioxide and triphenyl phosphite, and use nitrogen gas N 2 Replace 3 times. Under the pressure of 600Pa in the kettle, the temperature was raised to 180°C, and the esterification reaction was carried out for 0.8h. After the esterification reaction was completed, the excess ethylene glycol EG was recovered; then the temperature was raised to 260°C, and the polymerization was performed under vacuum for 3.4h. Cut into pellets to obtain copolymerized PETG polyester chips.

[0052]...

Embodiment 3

[0054] The difference between this embodiment and embodiment 2 is that the mass ratio of the extruded material from the main extruder and two auxiliary twin-screw extruders is 15:70:15, the thickness of the heat-sealing layer of the 20um film A layer is 3.0um, and the C The thickness of the anti-adhesion layer is 3.0um.

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Abstract

The invention relates to a polyester film and a preparation method thereof and particularly discloses a polyester film capable of being subjected to heat seal direction and a preparation method. The polyester film comprises a layer A, a layer B and a layer C, wherein the layer B is a middle core layer and made of a PET (polyethylene terephthalate) ultra-glazed polyester slice, the layer A is a surface heat-seal layer and made of a copolymerized PETG (polyethylene terephthalate glycol) polyester slice, and the layer C is an anti-blocking layer and made of a PET anti-blocking agent master batch slice and a PET ultra-glazed polyester slice. The preparation method includes steps of preparing corresponding polyester slices, extruding and drawing via an extruder, forming with cooling, crystallizing, drawing to remove scrap edges, treating coronas, detecting the thickness and the like.

Description

technical field [0001] The invention relates to a polyester film and a preparation method thereof, in particular to a directly heat-sealable polyester film and a preparation method thereof. Background technique [0002] With the development of social economy and the improvement of people's living standards, the requirements for environmentally friendly packaging materials are getting higher and higher. PET (polyester) is a world-recognized environmentally friendly green material. The directly heat-sealable polyester film made of modified raw materials and special production technology is a new high-performance, energy-saving and environmentally-friendly product innovated by my country's film industry and heat-sealing film industry. Ordinary polyester film products have the defect that they cannot be self-heat-sealed. In order to be used in heat-sealing applications, it usually requires a cumbersome and costly lamination process with other resins, which greatly limits its ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/36B32B27/18B29C69/02B29C47/06B29C55/14C08L67/02C08G63/183C08G63/78C08K3/36C08K5/526
Inventor 易志龙彭齐飞邱亚竞袁慎朋
Owner ZHEJIANG QIANGMENG IND
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