Preparation method of liquid crystal polymer film

Abstract

The invention relates to a preparation method of a liquid crystal polymer film. The preparation method of the liquid crystal polymer film comprises the following steps that 5 wt%-25 wt% of polytetrafluoroethylene granules and 75 wt%-95 wt% of liquid crystal high-molecular polymer granules are blended together, and melt granulation is performed by using an extruder to obtain surface-layer blended granules; the surface-layer blended granules and liquid crystal high-molecular polymer core layer granules are correspondingly fed into corresponding screw extruders for melt extrusion, the melting point of an extrudate is controlled to be Tm-10 DEG C -Tm-30 DEG C during the extrusion, and the extrudate is enabled to flow out of a melt with two surface layers and core layers of the surface layers after passing through a melt pipe, a three-layer adapter and a three-layer mold head, ultrasonic vibration perpendicular to the flowing direction of the melt is applied to the three-layer mold head andacting on the melt, the melt is shaped through a middle gap between a first set of shaping rollers and a second set of shaping rollers, and then transverse stretching, slitting, traction and windingare performed to obtain the liquid crystal polymer film with the two surface layers and the core layer structures. According to the preparation method of the liquid crystal polymer film, processing procedures are simplified, anisotropy is small, the dielectric constant is low, and the manufacturing cost can be reduced.

Description

technical field

[0001] The invention relates to a preparation method of a liquid crystal polymer film, belonging to the technical field of liquid crystal polymer film manufacture. Background technique

[0002] Liquid Crystal Polymer LCP (Liquid Crystal Polymer,) is an anisotropic aromatic polyester polymer material composed of rigid molecular chains, which can exist in a liquid crystal phase under certain conditions—the existing liquid Fluidity and crystal anisotropy, is a new type of high-performance special engineering plastics developed in the early 1980s. Liquid crystals self-organize at the molecular level and are classified into three types: thermotropic liquid crystals, lyotropic liquid crystals, and phototropic liquid crystals. Regardless of the type of LCP, there are a large number of rigid benzene ring structures on its molecular backbone, which determines its special physical and chemical characteristics and processing properties. Since the molecular chain of LC...

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