Fluoro-resin mixture, copper-clad plate made of same and making method thereof

Abstract

The invention relates to a fluoro-resin mixture, a copper-clad plate made of the same and a making method thereof. The fluoro-resin mixture comprises the following two substances as necessary components: 90-99 parts by weight of polytetrafluoroethylene (PTFE) emulsion and 1-10 parts by weight of fluorinated ethylene propylene (FEP) based on 100 parts by weight of an organic solid matter. The copper-clad plate made of the fluoro-resin mixture comprises a plurality of pieces of superimposed varnished cloth and copper foils covering one side or two sides of the varnished cloth, wherein each piece of varnished cloth comprises glass fiber cloth and a fluoro-resin mixture adhered thereon through dipping drying. The fluoro-resin mixture is prepared by taking the PEFE emulsion as base resins, the glass fiber cloth can be dipped for many times in the mixture under the condition of below PTFE sintering temperature (330 DEG C) to obtain the varnished cloth. The varnished cloth made from the fluoro-resin mixture has favorable gum dipping quality, uniform gum content, smooth surface, softness and easy operation. The copper-clad plate made from the fluoro-resin mixture has favorable comprehensive properties, excellent dielectric properties, simple making method and process, satisfies the dielectric property requirements on substrate materials in the field of high frequency communication 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