A new expanded polytetrafluoroethylene composite film and its preparation method

A polytetrafluoroethylene and composite film technology, applied in the field of plastic processing, can solve the problems of long time consumption, low production efficiency, uncontrollable composite film density, etc., and achieve the effect of smooth surface, time saving and production efficiency improvement.

Active Publication Date: 2021-04-27
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The density of the composite film obtained by this method is uncontrollable, and it takes a long time and the production efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The present embodiment provides a kind of preparation method of expanded polytetrafluoroethylene composite film, comprising:

[0029] ① Dispersed polytetrafluoroethylene resin is made into a calendered film by paste molding method, and expanded polytetrafluoroethylene film is obtained by biaxial stretching, and the thickness of the film is 0.05±0.02mm.

[0030] ② Roll the prepared film onto the laminating roller through the laminating unit. The film rolling speed is 5 turns / min, the pressure is 0.30MPa, and the winding thickness is 3.0-3.4mm. Fix the film at both ends of the laminating roller, and then put the roller cartridge removed.

[0031] ③Heat treatment is carried out on the film-coated roller coated with the film in a salt bath furnace, the heat treatment temperature is 370°C, and the treatment time is 2 hours.

[0032] ④ Remove the roller after heat treatment. When the temperature of the inner wall of the roller drops to 300°C, put the roller into the water po...

Embodiment 2

[0036] The present embodiment provides a kind of preparation method of expanded polytetrafluoroethylene composite film, comprising:

[0037] ① Dispersed polytetrafluoroethylene resin is made into a calendered film by paste molding method, and expanded polytetrafluoroethylene film is obtained by biaxial stretching, and the thickness of the film is 0.05±0.02mm.

[0038] ② Roll the prepared film onto the laminating roller through the laminating unit, the film rolling speed is 5 laps / min, the pressure is 0.30MPa, the thickness of the film is 3.0-3.4mm, fix the film at both ends of the laminating roller, and then roll the roller cartridge removed.

[0039] ③The film-coated roller is heat-treated in a salt-bath furnace at a temperature of 370°C for 2 hours. After heat treatment, it is naturally cooled at room temperature.

[0040] ④Remove the roller after heat treatment. When the temperature of the inner wall of the roller drops to 280°C, put the roller into the water pool, and rem...

Embodiment 3

[0044] The present embodiment provides a kind of preparation method of expanded polytetrafluoroethylene composite film, comprising:

[0045] ① Dispersed polytetrafluoroethylene resin is made into calendered film by paste molding method, and expanded polytetrafluoroethylene film is obtained by biaxial stretching, with a film thickness of 0.05±0.02mm.

[0046] ② Roll the prepared film onto the laminating roller through the laminating unit, the film rolling speed is 5 laps / min, the pressure is 0.30MPa, the thickness of the film is 3.0-3.4mm, fix the film at both ends of the laminating roller, and then roll the roller cartridge removed.

[0047] ③The film-coated roller is heat-treated in a salt-bath furnace at a temperature of 370°C for 2 hours. After heat treatment, it is naturally cooled at room temperature.

[0048] ④Remove the roller after heat treatment. When the temperature of the inner wall of the roller drops to 260°C, put the roller into the water pool, and remove it aft...

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Abstract

The invention relates to a new expanded polytetrafluoroethylene composite membrane and a preparation method thereof. The preparation method comprises: after the heat treatment, the temperature of the roller is lowered to 260-300° C., and then chilled to normal temperature. The invention can control the density of the expanded polytetrafluoroethylene composite film to a certain extent through the improvement of the cooling method, and greatly shorten the production process time.

Description

technical field [0001] The invention belongs to the technical field of plastic processing, and in particular relates to a new preparation method of an expanded polytetrafluoroethylene composite film. Background technique [0002] PTFE material has the advantages of corrosion resistance, weather resistance, high and low temperature resistance, etc. It is widely used in important sectors such as national defense, atomic energy, petroleum, radio, electrical machinery, chemical industry, etc., and has the reputation of "King of Plastics". Compared with traditional molded or basic formed PTFE materials, expanded PTFE has a lower density and stronger creep resistance, while retaining many physical and chemical properties of traditional PTFE, making it an ideal sealing material. [0003] Single-layer expanded PTFE film is widely used in chemical filtration industry and special clothing production industry; multi-layer composite film can be made into various sealing materials, and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C71/02
CPCB29C71/02B29C2071/025
Inventor 赵凡杨帆钟子强
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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