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Coextrusion casting polyester film and preparation method thereof

A polyester film and co-extrusion casting technology is applied in the field of polyester film and its preparation. The effect of high fastness and low melting point

Active Publication Date: 2015-05-20
ORG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the process of developing the cast film, people found that the single-layer cast polyester film has the problem of becoming brittle after a long time, which seriously affects the performance of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The invention provides a co-extruded cast polyester film, the polyester film is composed of isophthalic acid-modified PET resin (the molar content of isophthalic acid in the modified polyester is 10%, the characteristics The viscosity index is 0.8dL / g, the thickness is 4μm) and the middle layer is a maleic anhydride graft-modified PP resin (intrinsic viscosity index is 0.8dL / g, the thickness is 12μm) made by co-extrusion casting process.

[0031] The preparation method of above-mentioned co-extruded casting polyester film is as follows:

[0032] Additive SiO 2 After mixing with the isophthalic acid-modified PET resin in a ratio of 0.06:99.94, melt through a screw extruder, and extrude the melt at a die; carry out the above operations respectively in two extruders, and The same melt is extruded from the die; the PP resin grafted with maleic anhydride is melted by a screw extruder, and the melt is extruded at the die;

[0033] The melts extruded by the above three extru...

Embodiment 2

[0042] The invention provides a co-extruded cast polyester film, the polyester film is composed of isophthalic acid-modified PET resin (the molar content of isophthalic acid in the modified polyester is 12%, the characteristics The viscosity index is 0.75dL / g, the thickness is 6μm) and the middle layer is PP resin grafted with maleic anhydride (the intrinsic viscosity index is 0.8dL / g, the thickness is 18μm) through co-extrusion casting process.

[0043] The preparation method of above-mentioned co-extruded casting polyester film is as follows:

[0044] Additive SiO 2After mixing with the isophthalic acid-modified PET resin in a ratio of 0.1:99.9, melt through a screw extruder, and extrude the melt at a die; carry out the above operations respectively in two extruders, and Extruding the same melt from the die opening; melting the PP resin modified by the maleic anhydride graft through a screw extruder, and extruding the melt from the die opening;

[0045] The melts extruded ...

Embodiment 3

[0049] The invention provides a co-extruded cast polyester film, the polyester film is composed of isophthalic acid-modified PET resin (the molar content of isophthalic acid in the modified polyester is 12%, the characteristics The viscosity index is 0.8dL / g, the thickness is 3μm) and the middle layer is PP resin grafted with maleic anhydride (the intrinsic viscosity index is 0.8dL / g, the thickness is 14μm) through co-extrusion casting process.

[0050] The preparation method of above-mentioned co-extruded casting polyester film is as follows:

[0051] Additive SiO 2 After mixing with the isophthalic acid-modified PET resin in a ratio of 0.08:99.92, it is melted by a screw extruder, and the melt is extruded at a die; the above operations are carried out respectively in two extruders, and Extrude the same melt from the die mouth; melt through the screw extruder, and extrude the melt from the die mouth;

[0052] The melts extruded by the above three extruders flow into the sub...

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Abstract

The invention provides a coextrusion casting polyester film and a preparation method thereof. The polyester film is made by a coextrusion casting technique, wherein the inner and outer layers are isophthalic acid modified PET (Polyethylene Terephthalate) resin and the middle layer is maleic anhydride graft modified by PP (Propene Polymer) resin. The invention further provides a preparation method of the coextrusion casting polyester film. According to the technical scheme of the invention, the polyester film provided by the invention is high in elongation at break, difficult to become fragile after being stored for long time and capable of being adhered to the surface of a metal plate, so that the problem that the single layer of casting polyester film is easy to become fragile after being stored for long time in the prior art is solved.

Description

technical field [0001] The invention relates to a polyester film and a preparation method thereof, in particular to a co-extrusion casting polyester film and a preparation method thereof. Background technique [0002] In the metal can industry, the can body material is generally tin-plated steel sheet, chrome-plated steel sheet or chrome-plated aluminum sheet. In order to protect the metal from corrosion, a layer of paint is usually applied to the outer surface of the metal material for the can. However, the coating process There will be organic solvents that pollute the environment volatilize, and the paint and coating equipment are expensive, and the coating process is complicated. [0003] Later, it was found that the modified double-stretched polyester film can be attached to the surface of the metal plate, which solved the problem of environmental pollution caused by organic solvents, but there are also some defects, such as: the double-stretched polyester film has a hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B32B27/18B32B27/32B32B27/36B32B15/09B29C69/02B29C41/52B29C41/26
Inventor 赵宇晖曾科尹化洁
Owner ORG TECH CO LTD
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