High-performance polytetrafluoroethylene film, and manufacturing method of microwave substrate thereof

Abstract

The invention belongs to the field of communication, and particularly relates to a high-performance polytetrafluoroethylene (PTFE) film, and a manufacturing method of a microwave substrate thereof. The high-performance PTFE film comprises 10-70 parts of a filler and 30-90 parts of polytetrafluoroethylene resin, and the filler comprises nanometer silicon nitride, a glass fiber and a cationic polyurethane, and a mass ratio of the glass fiber to the cationic polyurethane to the nanometer silicon nitride is (3-7):(2-6):(1-4). An ultrathin high-performance PTFE film is prepared by a self-made ultrathin PTFE film device, and is used for preparing the microwave substrate. The obtained PTFE film has a low water absorption rate and a good bonding performance, and the microwave substrate has excellent thermodynamic and electrical properties.

Description

technical field [0001] The invention belongs to the communication field, and in particular relates to a high-performance polytetrafluoroethylene film and a manufacturing method of a microwave substrate thereof. Background technique [0002] Since the commercial production of polytetrafluoroethylene (PTFE) by DuPont in 1945, due to the unique physical and chemical properties of this material, people have been continuously developing the application of this material in various fields, among which the excellent dielectric properties of PTFE material are used Performance (low dielectric constant and low dielectric loss) to manufacture copper clad laminates for high frequency applications has been around for many years. From the 1970s to the 1980s, the United States developed different types of PTFE high-frequency boards for military communication electronic circuit substrates, including glass fiber cloth reinforced PTFE high-frequency boards (DK2.2-3.0), ceramic filled PTFE high...

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Problems solved by technology

This kind of PTFE varnished cloth has a thick texture (about 100um~210um in thickness) and poor appearance. Because the diaphragm contains glass fiber cloth, the isotropy is not uniform, and it cannot meet the high-end use requirements of high-performance ultra-thin high-frequency boards.

[0005] For the manufacture of PTFE film, there is currently another way to use "turning", that is, use PTFE resin to make a solid columnar compaction, and then use a tool to turn the PTFE film. The thickness of this film is generally 30um to 100um. However, this method It is impossible to add a large amount of inorganic fillers, and high-performance PTFE films cannot be produced, and the maximum width is only 0.3m, because after adding a large amount of inorganic fillers, the toughness of the film decreases and it is easy to tear, so it cannot be turned and manufactured

[0006] At present, no domestic manufacturer has been able to produce high-performance ultra-thin PTFE films and microwave substrates

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