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Polyester film, and a preparation method and applications thereof

A polyester film and film technology, applied in the field of materials, can solve the problems of not being able to meet the high-temperature cooking performance of bonded products, not being able to meet the requirements for deep processing of laminated metal plates, and not being able to meet the needs of deep processing of coated metal plates, etc., to achieve Low depreciation cost of fixed equipment, low equipment price, energy saving and processing cost effects

Inactive Publication Date: 2012-05-02
ORG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The patent application CN102070882A was published on May 25, 2011, and introduced a polyester film for laminating the surface of metal sheets and its preparation method. High, consumes a lot of energy, and the double-drawing equipment is expensive, and the film production cost is high
In addition, the elongation at break of the double-stretched film is low, which cannot meet the requirements of deep processing of laminated metal plates
[0008] In the prior art, on the one hand, the production of polyester film is mainly a double-drawing process, and the elongation at break is low, which cannot meet the deep processing requirements of the coated metal plate; The equipment has high requirements, which wastes energy and increases costs; double-stretched polyester films usually use film-grade resins, with an intrinsic viscosity of about 0.62-0.68dL / g and a small molecular weight, which is difficult to meet the contact requirements of high-fat food
On the other hand, although the coated double-stretched polyester film has a certain degree of metal adhesion, it is difficult to meet the strength of metal adhesion, and cannot meet the performance of high-temperature cooking resistance of bonded products, and the product coating process uses organic solvents, polluting the environment

Method used

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  • Polyester film, and a preparation method and applications thereof
  • Polyester film, and a preparation method and applications thereof
  • Polyester film, and a preparation method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] This embodiment discloses a kind of polyester film, and its raw material formula is:

[0033] Bottle-grade polyester chips: isophthalic acid-modified polyethylene terephthalate with an intrinsic viscosity of 0.78dl / g and a melting point of 240°C, and the molar content of the modified monomer isophthalic acid is 5%; Diformic acid modified polyethylene terephthalate is formed by adding isophthalic acid during the polymerization process of terephthalic acid and ethylene glycol through esterification and polycondensation.

[0034] Additive slice: SiO 2 The mass fraction of is 4000ppm, and the balance is the above-mentioned isophthalic acid-modified polyethylene terephthalate.

[0035] Production process: The above raw materials are fully mixed according to the weight ratio of bottle-grade polyester chips and additive chips at a weight ratio of 5:1, and dried on a fluidized bed at a drying temperature of 130°C for 4 hours. The dried mixture is extruded through a twin-screw...

Embodiment 2

[0039] This embodiment discloses a kind of polyester film, and its raw material formula is:

[0040] Bottle-grade polyester chips: intrinsic viscosity 0.84dl / g, melting point 248°C, isophthalic acid modified polyethylene terephthalate, molar content of isophthalic acid 2%;

[0041] Additive slice: SiO 2 The mass fraction of is 3000ppm, and the balance is the above-mentioned isophthalic acid-modified polyethylene terephthalate.

[0042] Production process: The above raw materials are fully mixed with bottle-grade polyester chips and additive chips at a ratio of 5:1, and dried on a fluidized bed at a drying temperature of 140°C for 4 hours. The dried mixture is extruded through a twin-screw extruder. The temperature of each zone of the extruder is between 250°C and 265°C. It is extruded through a single-layer die with a melt thickness of 0.20mm. For film formation, the temperature of the casting roll is 60-75°C, the linear speed of the casting roll is 10 times of the melt outf...

Embodiment 3

[0046] This embodiment discloses a kind of polyester film, and its raw material formula is:

[0047] Bottle-grade polyester chips: intrinsic viscosity 0.90dl / g, melting point 251°C, isophthalic acid-modified polyethylene terephthalate, molar content of isophthalic acid 1.2%;

[0048] Additive slice: SiO 2 The mass fraction of is 2000ppm, and the balance is the above-mentioned isophthalic acid-modified polyethylene terephthalate.

[0049] Production process: The above-mentioned raw materials are fully mixed with bottle-grade polyester chips and additive chips in a ratio of 4:1, and dried on a fluidized bed at a temperature of 150°C for 4 hours. The dried mixture is extruded through a twin-screw extruder. The temperature of each zone of the extruder is between 255°C and 270°C. It is extruded through a single-layer die with a melt thickness of 0.30mm. For film formation, the temperature of the casting roll is 60-75°C, the linear speed of the casting roll is 10 times of the melt...

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Abstract

The invention discloses a polyester film, and a preparation method and applications thereof. The polyester film is prepared by adopting processes of casting and setting and comprises the following components according to the weight ratio: 300-1200ppm of antiblocking inorganic additive and the balance polyethylene glycol terephthalate or modified resin with the intrinsic viscosity being more than 0.78dL / g. In the invention, the defects in the prior art are overcome, and the advantages of low degree of orientation, high elongation at break (up to 480%), good toughness for long time, large molecular weight and narrow distribution are realized. The polyester film has the characteristics of good adhesiveness on metal, low lining temperature, good deep-punching processing resistance, excellent printing effect, low small-molecular mobility and the like and has wide use prospect in the industries such as metal package and flexible package.

Description

technical field [0001] The invention relates to material technology, in particular to a polyester film, its preparation method and application. Background technique [0002] With the continuous development of the metal packaging industry and the continuous improvement of the can-making process, the demand for packaging materials has become increasingly prominent. In recent years, many famous companies at home and abroad have successively developed products related to coated iron. Due to its excellent barrier properties, excellent lamination and printing performance, and good processability, polyester film has become the best choice for coating in coated iron. The common types of coated iron are double-drawn modified polyester film, glue-coated double-drawn polyester film, heat-sealed double-drawn polyester film, etc. Coated iron is gradually replacing painted iron to apply the policies and regulations of various countries on environmental protection, energy saving and sanit...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08K3/36C08K3/26C08K3/34
Inventor 赵宇晖叶强曾科
Owner ORG TECH CO LTD
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