Preparing method for fireproof PTFE film

A technology of polytetrafluoroethylene film and polytetrafluoroethylene, which is applied in the field of preparation of fireproof polytetrafluoroethylene film, can solve the problem of poor fireproof performance of polytetrafluoroethylene film, limit the application of pure polytetrafluoroethylene film, Electrostatic performance limitations and other issues, to achieve the effects of improved mechanical properties, excellent fire resistance, and improved corrosion resistance

Inactive Publication Date: 2015-12-09
ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the polytetrafluoroethylene film has a high degree of water resistance, its electrical conductivity is extremely poor, and its antistatic performance limits its use.
For the metal smelting industry, in addition to the harsh working conditions, dust is also collected, which limits the application of pure PTFE membranes
[0004] The PTFE film of the prior art has poor fireproof performance, and it is prone to deformation and cracking when combined with other materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Select polytetrafluoroethylene powder with a particle size of 0.2-0.5 microns, mix polytetrafluoroethylene powder and liquid lubricant at a weight ratio of 30:70, and let it stand for 3 hours at a temperature of 75°C to ensure polytetrafluoroethylene Vinyl fluoride powder is fully mixed with liquid lubricant to form a mixture.

[0022] 2. Spray the mixture obtained above evenly on the metal fiber mesh base material, the selected metal fiber mesh has a diameter of 2-6 microns, and press it into a cylindrical blank on the compact, and the pressing temperature is 30°C.

[0023] 3. Extrude the cylindrical blank made above into a rod at a temperature of 40° C. through a pusher, and roll it into a polytetrafluoroethylene-based tape at a temperature of 40° C. through a calender.

[0024] 4. Stretch the PTFE-based tape obtained above longitudinally in an oven at 230°C, then stretch it transversely at 200°C, and finally sinter it at 270°C for 45 seconds to form a shaped film,...

Embodiment 2

[0034] A preparation method for a fireproof polytetrafluoroethylene film, comprising the following steps:

[0035] 1. Select polytetrafluoroethylene powder with a particle size of 0.2-0.5 microns, mix polytetrafluoroethylene powder and liquid lubricant at a weight ratio of 25:75, and let it stand for 5 hours at a temperature of 85°C to ensure polytetrafluoroethylene Vinyl fluoride powder is fully mixed with liquid lubricant to form a mixture.

[0036] 2. Spray the mixture obtained above evenly on the metal fiber mesh base material, the selected metal fiber mesh has a diameter of 2-6 microns, and press it into a cylindrical blank on the compact, and the pressing temperature is 36°C.

[0037] 3. Extrude the cylindrical blank made above into a rod at a temperature of 45° C. through a pusher, and roll it into a polytetrafluoroethylene tape through a calender at a temperature of 60° C.

[0038] 4. Stretch the polytetrafluoroethylene base tape obtained above in an oven at 300°C lon...

Embodiment 3

[0041] 1. Select polytetrafluoroethylene powder with a particle size of 0.2-0.5 microns, mix polytetrafluoroethylene powder and liquid lubricant at a weight ratio of 20:80, and let it stand for 6 hours at a temperature of 90°C to ensure polytetrafluoroethylene Vinyl fluoride powder is fully mixed with liquid lubricant to form a mixture.

[0042] 2. Spray the mixture obtained above evenly on the metal fiber mesh base material. The selected metal fiber mesh has a diameter of 2-6 microns, and press it into a cylindrical blank on the compact at a pressing temperature of 45°C.

[0043] 3. The cylindrical blank made above is extruded into a rod at a temperature of 50°C by a pusher, and rolled into a polytetrafluoroethylene-based belt by a calender at a temperature of 66°C.

[0044] 4. Stretch the polytetrafluoroethylene base tape obtained above in an oven at 305°C longitudinally, then stretch it transversely at 220°C, and finally sinter it at 320°C for 56s to form a shaped film, spr...

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Abstract

The invention discloses a preparing method for a fireproof PTFE film. The method includes the following steps that PTFE powder and a liquid lubricant are mixed to form a mixture; the mixture is evenly sprayed to a metal fiber mesh base material and pressed on a pressing blank to obtain a cylindrical blank; the blank is extruded by a push extruder to obtain a club, and the club is subjected to calendering through a calender to form a PTFE base band; the PTFE base band is subjected to longitudinal drawing and then transverse drawing in a drying oven, finally, a shaped film is formed after sintering and shaping, the shaped film is sprayed with cooling water, and then the PTFE film is obtained. By means of the PTFE film, the filtering precision and ventilation property of filtering products are greatly improved on the condition of extreme condition resistance. The PTFE film has excellent fireproof performance, the high temperature resistance and the corrosion resistance are improved, the PTFE film can well adhere to the base material, and the malleability and mechanical property of the PTFE film are also improved.

Description

technical field [0001] The invention belongs to the technical field of film preparation, in particular to a method for preparing a fireproof polytetrafluoroethylene film. Background technique [0002] PTFE film is made of suspending PTFE resin through molding, sintering, cooling to form a blank, and then turning and calendering. The film formed by turning is a non-oriented film, and the non-oriented film becomes an oriented film after calendering. The non-oriented film is rolled 1.1-1.8 times to become a semi-oriented film. PTFE film is used as capacitor medium, as wire insulation, electrical instrument insulation, and sealing gasket. PTFE film is divided into PTFE color film, PTFE activated film and F46 film. [0003] The PTFE film is composed of billions of continuous fibrils intertwined with each other. The film has high strength and smooth surface. Secondly, PTFE membrane has high chemical resistance and corrosion resistance, and is widely used in chemical, electroni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D7/01C08L27/18C08L91/00C08K7/06
Inventor 朱朋飞刘江峰徐辉周冠辰
Owner ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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