Preparation method of liquid crystal polymer film material with low dielectric constant and low dielectric loss

Abstract

The invention discloses a preparation method of a liquid crystal polymer film material with a low dielectric constant and a low dielectric loss. The preparation method comprises the following steps of: S1, dissolving a liquid crystal polymer into a solvent to obtain a liquid crystal polymer solution; S2, adding fluororesin powder into the liquid crystal polymer solution, and dispersing the mixed material; S3, coating the surface of a release base material with the mixed material obtained in the step S2, and carrying out drying and melting treatment on a coating layer to form a film; and S4, separating a film layer from the release base material to prepare the liquid crystal polymer film material. The preparation method of the liquid crystal polymer film material with the low dielectric constant and the low dielectric loss sequentially comprises the four steps of dissolving the liquid crystal polymer, dispersing the fluororesin powder, coating and drying the mixed material and forming the film to separate from the release base material, and more fluororesin is conveniently added into the liquid crystal polymer film material by adopting a liquid mixing mode; and the fluororesin powder in the liquid crystal polymer film material is dispersed more uniformly. The invention also discloses the liquid crystal polymer film material and a mobile phone antenna based on the liquid crystalpolymer film material.

Description

technical field [0001] The invention relates to the technical field of liquid crystal polymer film manufacturing, in particular to a method for preparing a liquid crystal polymer film with low dielectric constant and low dielectric loss, a liquid crystal polymer film and a mobile phone antenna. Background technique [0002] Liquid crystal polymer (LCP) materials have high strength, high modulus, outstanding heat resistance, extremely small linear expansion coefficient, excellent flame resistance, electrical insulation, chemical corrosion resistance, weather aging resistance and microwave permeability, It is an ideal high-frequency (millimeter wave) material due to its excellent molding and processing properties. With the development of the 5G industry, the industry has lower requirements for the transmission loss of materials under high-frequency conditions, and the dielectric loss of existing LCP film materials is relatively large, which can no longer meet the requirements ...

AI Technical Summary

Problems solved by technology

[0004] In the above process, the mixture of polytetrafluoroethylene and liquid crystal polymer is first made into pellets, and then extruded to obtain the blended surface layer. The production process has the following defects: first, the content of polytetrafluoroethylene in the production process based on pellet blending Low, based on the sum of the mass of liquid crystal polymer and polytetrafluoroethylene as 100%, the mass percentage of polytetrafluoroethylene pellets is 5 to 25%; second, polytetrafluoroethylene in the liquid crystal polymer film obtained by co-extrusion The dispersion uniformity of vinyl fluoride is not good; third, the stretching treatment may have an adverse effect on the consistency of the dielectric constant of the liquid crystal polymer film; fourth, limited by the extrusion equipment, the maximum The large width is a fixed value