Fluororesin mixture, copper-clad plate prepared therefrom and manufacturing method thereof

Abstract

The invention relates to a fluororesin mixture, a copper-clad plate prepared therefrom and a manufacturing method thereof. The fluororesin mixture contains the following two substances as necessary components in 100 parts by weight of an organic solid substance: 90-99 parts of polytetrafluoroethylene (PTFE) emulsions and 1-10 parts of polytetrafluoroethylene perfluoroalkyl vinyl ether (PFA) emulsions. The copper-clad plate prepared from the fluororesin mixture comprises a plurality of superimposed varnished cloths and copper foil coating one or two surfaces of the varnished cloths, and each varnished cloth comprises a glass fiber cloth and the fluororesin mixture attached to the dipped and dried glass fiber cloth. The fluororesin mixture is prepared by using the PTFE emulsions as main resins and can dip the glass fiber cloths many times under the condition that the PTFE sintering temperature is330 DEG C to prepare the vanished cloths, and the vanished cloths prepared from the fluororesin mixture has the advantages of good gum dipping quality, level surface, flexibility and easy operation; and besides, the copper-clad plate made from the fluororesin mixture has excellent dielectric performance which meets the dielectric performance requirement of the high-frequency communication field for a base plate material, and has simple making method and process and is beneficial to industrial continuous production.

Description

technical field [0001] The invention relates to a fluororesin mixture, in particular to a fluororesin mixture, a copper-clad laminate made using the fluororesin mixture and a manufacturing method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) has been commercialized by DuPont since 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 them, the excellent dielectric properties of PTFE materials are used Performance (low dielectric constant and low dielectric loss) to manufacture copper-clad laminates for high-frequency applications has been used for many years, such as US Patent 2539329 introduced the method of fluororesin impregnated glass fiber cloth to make glass fiber varnish; US Patent 3136680 is the first to introduce PTFE The patent of copper clad laminate, which is made of glass fiber cloth impregnated with PTFE emulsion, and t...

AI Technical Summary

Problems solved by technology

[0002] Polytetrafluoroethylene (PTFE) has been commercialized by DuPont since 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 them, the excellent dielectric properties of PTFE materials are used Performance (low dielectric constant and low dielectric loss) to manufacture copper-clad laminates for high-frequency applications has been used for many years, such as US Patent 2539329 introduced the method of fluororesin impregnated glass fiber cloth to make glass fiber varnish; US Patent 3136680 is the first to introduce PTFE The patent of copper clad laminate, which is made of glass fiber cloth impregnated with PTFE emulsion, and then covered with a layer of perfluoroethylene propylene film, and then pressed with copper foil treated with nickel and cadmium; US patent 03556161 introduces the use of PTFE powder to The method of manufacturing the sheet is the technical basis for the subsequent filling of non-glass fiber cloth reinforced copper clad laminates; US patent 4335180 introduces a kind of glue mixed with fluoropolymer, inorganic filler and glass fiber yarn, and a coagulant is added Flocculate the glue into a dough-like object, then dry and press it into a sheet, and then coat copper to form a copper clad laminate; US Patent 4849284 introduces the use of silica powder as the main filler for PTFE emulsion to make low dielectric constant High-frequency copper-clad laminates with low thermal expansion coefficient; U.S. Patent 4886699 introduces high-frequency copper-clad laminates that are composited with glass fiber cloth paint sheets and glass fiber yarn sheets to form an insulating substrate, which solves the problem of traditional PTFE copper-clad laminates or high dielectric constant. Either the problem of poor dimensional stability

[0003] The PTFE glass fiber cloth paint sheet used in the above technology generally can reach the required resin content after multiple dipping, drying, and sintering, and the surface of the PTFE paint sheet after sintering is smooth, and will produce certain curl due to resin shrinkage, thus Affect the quality of subsequent re-dipping and the quality of the final board; and US Patent 2539329 mentioned that the PTFE glass fiber cloth paint sheet should be pretreated at 205 ° C, and then impregnated after rolling to improve the "excessive thickness of PTFE coating This method has the phenomenon that the original coating is easy to fall off when it is dipped again, because PTFE is only closely arranged and does not form a film that is entangled as a whole after sintering, so it is not suitable for industrial continuous production