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A kind of preparation method of expanded polytetrafluoroethylene composite film

A technology of polytetrafluoroethylene and composite film, which is applied in the field of plastic processing, can solve problems such as bulging and composite film cooling too fast, and achieve the effect of improving product quality, reducing cooling speed, and eliminating bulging problems

Active Publication Date: 2019-01-04
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

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to propose a preparation method of expanded polytetrafluoroethylene composite membrane, which solves the problem of bulging caused by the rapid cooling of the composite membrane after heat treatment

Method used

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  • A kind of preparation method of expanded polytetrafluoroethylene composite film

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Experimental program
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Effect test

Embodiment 1

[0029] Laminated rolls and guards for heat treatment see figure 1 , the coating roller 1 is cylindrical, the coating roller 1 and the protective cover are made of stainless steel, the protective cover is composed of two semi-cylinders 2 of the protective cover, and the two semi-cylinders pass through screws and screw holes before heat treatment Butt together to form a cylindrical protective cover, which is set outside the film-coated roller. The diameter of the protective cover is 20mm larger than that of the film-coated roller, and the thickness of the protective cover is 2mm.

[0030] The preparation process of expanded polytetrafluoroethylene composite membrane is as follows:

[0031] 1) Dispersed polytetrafluoroethylene resin is prepared into a calendered film by a paste molding method, and an expanded polytetrafluoroethylene film is obtained through biaxial stretching, and the thickness of the film is 0.05mm.

[0032] 2) Roll the prepared film onto the film-coating roll...

Embodiment 2

[0043] The film-coated roller and protective cover that are used for heat treatment are as embodiment 1.

[0044] The preparation process of expanded polytetrafluoroethylene composite membrane is as follows:

[0045] 1) Dispersed polytetrafluoroethylene resin is prepared into a calendered film by a paste molding method, and an expanded polytetrafluoroethylene film is obtained through vertical and horizontal biaxial stretching, and the thickness of the film is 0.02mm.

[0046] 2) Roll the prepared film onto the film-coating roller through the film-coating unit. The film-rolling speed is 4 laps / minute, the pressure is 0.40MPa, and the thickness of the film is 1.4mm. Unload, and add a protective cover to the roller covered with film.

[0047] 3) Carry out heat treatment on the film-coated roller equipped with a protective cover in a salt bath furnace, the heat treatment temperature is 365°C, the treatment time is 2 hours, and the heat treatment is naturally cooled at room temper...

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Abstract

The invention provides a preparing method for an expanded polytetrafluoroethylene composite film. The preparing method includes the steps that firstly, a base film is prepared, wherein the expanded polytetrafluoroethylene film is prepared through bidirectional stretching; secondly, film covering is conducted, wherein the expanded polytetrafluoroethylene film is upwards coiled onto a film covering roller through a film covering unit, and a protection cover is additionally arranged on the roller covered with the film; thirdly, heat treatment is conducted, wherein the film covering roller on which the protection cover is additionally arranged is subjected to heat treatment and is taken out to be naturally cooled at the room temperature after heat treatment; and fourthly, cutting and packaging are conducted. According to the method, under existing film covering unit conditions, the roller covered with the film is additionally provided with the protection cover, and the protection cover is cooled together with the roller during heat treatment. The cooling speed of the composite film in the cooling process can be effectively reduced through the protection cover, the bulging problem of the expanded polytetrafluoroethylene composite film obtained after treat treatment on the roller can be solved with the method, and the product quality is improved.

Description

technical field [0001] The invention belongs to the field of plastic processing, and in particular relates to a preparation method of a polytetrafluoroethylene sealing material. 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 and military industry, atomic energy, petroleum, radio, electrical machinery, and chemical industry. It has the reputation of "King of Plastics". It is widely used on the large transport aircraft -20. Compared with traditional molded or extruded PTFE materials, expanded PTFE has a lower density, stronger creep resistance, and retains many physical and chemical properties of traditional PTFE, making it an ideal sealing material . Single-layer expanded PTFE film is widely used in chemical filtration industry and special clothing production industry; multi-layer composite film can be made in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D7/01
CPCB29D7/01
Inventor 赵凡杨帆钟子强李光材
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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