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Preparation method of teflon oriented film of ultra-thin breadth

A technology of polytetrafluoroethylene and oriented film, which is applied in the field of plastic processing and manufacturing, can solve problems such as insufficiency, and achieve the effect of not easy to curl and uniform performance.

Inactive Publication Date: 2009-07-29
广州市东泓氟塑料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the PTFE oriented film sold on the market has a thickness of more than 20 μm and a width of less than 120 mm, which cannot meet the requirements of those fields that require wide-format films.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The preparation method of the ultra-thin wide polytetrafluoroethylene oriented film described in this implementation mainly comprises the following steps:

[0018] (1) Raw material sieving: Since the polytetrafluoroethylene powder raw material is easy to agglomerate into agglomerates, it is first broken up with a masher, and then vibrated and sieved through a 20-mesh sieve to remove the material with large particles, and retain it below 840 μm; Stir the PTFE powder and various fillers evenly at high speed in a high-speed mixer.

[0019] (2) Blank production: In a dust-free environment, pour the mixture into a cylindrical barrel mold, and die-cast it under a 100-ton four-column hydraulic press. A die-casting cycle is preferably 15-20 minutes;

[0020] (3) Sintering molding: the prepared blank is placed in a sintering furnace, and the blast rotary sintering method is adopted. The temperature control system of the sintering furnace is controlled by a computer program. It ...

Embodiment 2

[0026] The preparation method of the ultra-thin wide polytetrafluoroethylene oriented film described in this implementation mainly comprises the following steps:

[0027] (1) raw material mixing: with embodiment 1;

[0028] (2) Blank production: with embodiment 1;

[0029] (3) Sintering molding: the prepared blank is placed in a sintering furnace, and the blast rotary sintering method is adopted. The temperature control system of the sintering furnace is controlled by a computer program. It uses different temperature zones to heat up, keep warm, reheat, and then keep warm. The room temperature is raised to 185°C, and 185°C is kept; ℃ to 325℃, 325℃ to keep warm; 325℃ to 385℃, the sintering temperature is 385℃, then 385℃ to 285℃, 285℃ to keep, and then 285℃ to 185℃, and the temperature is kept at 185℃ After a period of time, stop the furnace and take it out;

[0030] (4) Turning into film: Preheat the sintered and cooled blank to 80°C, clamp it on a lathe, and turn it at a ra...

Embodiment 3

[0035] The preparation method of the ultra-thin wide polytetrafluoroethylene oriented film described in this implementation mainly comprises the following steps:

[0036] (1) raw material mixing: with embodiment 1;

[0037] (2) Blank production: with embodiment 1;

[0038] (3) Sintering molding: the prepared blank is placed in a sintering furnace, and the blast rotary sintering method is adopted. The temperature control system of the sintering furnace is controlled by a computer program. It uses different temperature zones to heat up, keep warm, reheat, and then keep warm. The room temperature is raised to 205°C, and 205°C is kept; Temperature rises to 325°C, 325°C heat preservation; 325°C heats up to 375°C, the sintering temperature is 375°C, then cools down from 375°C to 325°C, heats up at 325°C, then cools down from 325°C to 205°C, and keeps the temperature at 205°C After a period of time, stop the furnace and take it out;

[0039] (4) Turning into film: Preheat the sint...

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Abstract

The invention discloses a method for preparing an ultra-thin broad-width polytetrafluoroethylene oriented film. The polytetrafluoroethylene oriented film is prepared by the following technical measures: screening raw materials, prepressing to make preform, sintering at a high temperature, turning to form films, rolling to orient and the like. The thickness of the oriented film is from 5 mu m to 50 mu m, and the width is more than 200 mm. The oriented film can be used as high-grade insulating pads, protecting sleeves, abrasion reducing materials, chemical industrial antiseptic materials and the like in the electromechanical and electronic industries and can be used for a long time at a temperature of between 200 DEG C below zero and 250 DEG C.

Description

technical field [0001] The invention relates to a method for preparing an ultra-thin and wide-width polytetrafluoroethylene oriented film, belonging to the technical field of fluoroplastic processing and manufacturing. Background technique [0002] PTFE oriented film is made of PTFE resin through molding, sintering, cooling to form a blank, and then turning, calendering and orientation. PTFE film has high strength, good insulation and non-stickiness. Among fluoroplastics, polytetrafluoroethylene (PTFE) consumes the most and is most widely used. Because PTFE has an inert fluorine-containing shell outside the molecule, it has outstanding non-stick properties and low friction coefficient. PTFE has excellent high and low temperature resistance and chemical stability, good electrical insulation performance, non-adhesion, weather resistance, flame retardancy and good self-lubricating properties. It has the reputation of "King of Plastics". [0003] At present, the PTFE oriented ...

Claims

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Application Information

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IPC IPC(8): B29C67/04B29C43/46B23Q15/08B29L7/00
Inventor 郑景新吴东建段先健申士和
Owner 广州市东泓氟塑料股份有限公司
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