Fluorine-containing thin film tape casting preparing method

A film casting and thin film technology, which is applied in the preparation of ETFE) casting method, PFA, and fluorine-containing film (FEP), can solve the problems of large film thickness deviation and poor flatness

Active Publication Date: 2015-07-22
SHANGHAI PLASTICS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the production of fluorine-containing film (FEP, PFA, ETFE) is mainly blow molding method in China. A screw head is installed behind the extruder, and the upward blowing method is adopted. The shape of the film produced is cylindrical, but the thickness of the film varies. Inadequacies such as large size and poor flatness limit its application fields

Method used

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  • Fluorine-containing thin film tape casting preparing method
  • Fluorine-containing thin film tape casting preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put the FEP resin through a single-screw extruder with a diameter of 75mm and L / D = 25, flow out through a casting die (the width of the die is 1200 mm), and then shape it through a casting roll and a cooling roll, and finally draw and cut it. rolls to obtain a film of desired thickness. Among them, the screw and barrel of the extruder, the runners in the connecting area, the runners in the screen changing area and the runners in the casting die are all made of nickel alloy.

[0026] The temperature in the first zone of the extruder is set to 260°C;

[0027] The temperature in the second zone of the extruder is set to 310°C;

[0028] The temperature in the third zone of the extruder is set to 325°C;

[0029] The temperature of the junction zone is maintained at about 325°C;

[0030] The temperature in the screen changing area is kept at about 325°C;

[0031] The temperature of the casting die is maintained at about 330°C;

[0032] The temperature of the first tempe...

Embodiment 2

[0037] Put the PFA resin through a single-screw extruder with a diameter of 75mm and L / D = 25, flow out through a casting die (the width of the die is 1200 mm), and then pass through a casting roll and a cooling roll for shaping, and finally draw, cut and collect rolls to obtain a film of desired thickness. Among them, the screw and barrel of the extruder, the runners in the connecting area, the runners in the screen changing area and the runners in the casting die are all made of nickel alloy.

[0038] The temperature of the first zone of the extruder is set to be maintained at about 305°C;

[0039] The temperature in the second zone of the extruder is set to be maintained at about 350°C;

[0040] The temperature of the extruder three zone is set to maintain at about 380°C;

[0041] The temperature of the connection zone is maintained at about 380°C;

[0042] The temperature in the screen changing area is kept at about 380°C;

[0043] The temperature of the casting die is...

Embodiment 3

[0049] Put the ETFE resin through a single-screw extruder with a diameter of 75mm and L / D = 25, flow out through a casting die (the width of the die is 1200 mm), and then pass through a casting roll and a cooling roll for shaping, and finally traction, cutting and harvesting rolls to obtain a film of desired thickness. Among them, the screw and barrel of the extruder, the runners in the connecting area, the runners in the screen changing area and the runners in the casting die are all made of nickel alloy.

[0050] The temperature in the first zone of the extruder is set to 260°C;

[0051] The temperature in the second zone of the extruder is set to 320°C;

[0052] The temperature in the third zone of the extruder is set to 340°C;

[0053] The temperature of the connection zone is maintained at about 340°C;

[0054] The temperature in the screen changing area is kept at about 340°C;

[0055] The temperature of the casting die is maintained at about 340°C;

[0056] The tem...

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Abstract

The invention relates to a preparation method of fluorine-containing film casting method, wherein the fluorine-containing resin (FEP, PFA, ETFE) is extruded by a screw to obtain a molten fluorine-containing polymer, and then extruded through a casting die to obtain a melt film, a melt film After being cooled and shaped by casting rolls and cooling rolls, and then through online thickness detection and automatic feedback information, the die head automatically adjusts the opening of the die lip to obtain a film whose thickness deviation is controlled within ±2%, and then conducts static elimination and slitting Winding, the final film has good surface smoothness, smoothness and very small thickness deviation, while maintaining other excellent physical properties of the film.

Description

technical field [0001] The invention relates to a method for preparing a fluorine-containing film (FEP, PFA, ETFE) by casting method. Background technique [0002] The comprehensive properties (chemical stability, electrical properties and non-stickiness) of polyperfluoroethylene propylene (FEP), that is, tetrafluoroethylene-hexafluoropropylene copolymer, are similar to those of polytetrafluoroethylene (PTFE). The maximum long-term use temperature of FEP is 204°C. Therefore, FEP film has high heat resistance, low water absorption, and good chemical stability to various agents. FEP film has valuable comprehensive properties, so it has been applied in different fields, such as chemical equipment manufacturing, electronics and electrical technology, and automobile manufacturing. , aviation and aerospace technology, foil dielectric manufacturing and other fields. [0003] Tetrafluoroethylene-perfluoroalkyl ether copolymer (PFA) is a new type of fluorocarbon plastic. PFA can b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C69/02B29C47/00B29C41/26B29C47/92B29C41/52B29L7/00B29C48/08B29C48/92
CPCB29C48/92B29C48/08B29C2948/92152B29C2948/92438B29C2948/92647B29C2948/92904
Inventor 彭为亚刘华新戚伟忠
Owner SHANGHAI PLASTICS RES INST CO LTD
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