Liquid crystal polymer film and manufacture method

A technology of a liquid crystal polymer and a manufacturing method, applied in the field of material processing, can solve the problems of inability to meet the use requirements of flexible circuit boards, poor tensile strength, etc., and achieve the effects of easy mass production, simple manufacturing method and low manufacturing cost

Inactive Publication Date: 2019-04-23
SHENZHEN SUNWAY COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the high orientation of liquid crystal polymers under the action of shear force, the films prepared by conventional methods have higher mechanical properties in the MD direction (Machine Direction, mechanical direction), while in the TD direction (Transverse Direction, vertical The tensile strength in the mechanical direction) is very poor, that is, it is anisotropic, and the anisotropic liquid crystal film cannot meet the needs of flexible circuit boards.

Method used

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  • Liquid crystal polymer film and manufacture method

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Embodiment 1

[0033] Please refer to figure 1 , Embodiment 1 of the present invention is:

[0034] A liquid crystal polymer film, comprising a first oriented film 1 and a second oriented film 2 which are sequentially stacked alternately, the orientation direction of the first oriented film 1 and the orientation direction of the second oriented film 2 of two adjacent layers are The directions intersect, and the first alignment film 1 and the second alignment film 2 are thermocompressed to obtain the liquid crystal polymer film. In Figure 1, the orientation directions of the first oriented film 1 and the second oriented film 2 are respectively parallel to the directions indicated by the two arrows. In this embodiment, the thicknesses of the first oriented film 1 and the second oriented film 2 are both 5-100 μm, and the number of layers of the first oriented film 1 and the second oriented film 2 is 1-5 layers, and finally The number of layers of the obtained liquid crystal polymer film is 2-...

Embodiment 2

[0036] A method for manufacturing a liquid crystal polymer film, which is used to manufacture the liquid crystal polymer film in Example 1, mainly includes the following steps:

[0037] The first oriented film and the second oriented film with a thickness of 5 to 100 μm are prepared by extrusion blow molding, extrusion casting or extrusion calendering, and the same batch of films can be used for the first oriented film and the second oriented film, but Different placement directions lead to different final orientation directions.

[0038] The first alignment film and the second alignment film used to manufacture the liquid crystal polymer film are sequentially stacked and arranged so that the alignment direction of the adjacent first alignment film intersects the alignment direction of the second alignment film to obtain a stacked structure. Preferably, the orientation direction of the first oriented film and the orientation direction of the second oriented film of two adjace...

Embodiment 3

[0041] A method for manufacturing a liquid crystal polymer film, the difference from Embodiment 2 is:

[0042] A thermoplastic liquid crystal polymer resin (VECTRA A950) was blown into a film at 310° C. using an extrusion blow molding machine. The screw speed of the extruder was 80 rpm, the diameter of the extrusion die was 60 mm, the gap was 0.8 mm, and the inflation ratio was 1:4 to obtain a first oriented film and a second oriented film with a thickness of about 50 μm.

[0043] Laminate the first oriented film and the second oriented film according to the intersecting direction of MD and TD. The number of laminated layers is 2 layers, and then press them under the laminator. The pressing temperature is 240°C and the pressure is 10MPa to obtain the thickness 100 μm liquid crystal polymer film.

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Abstract

The invention discloses a liquid crystal polymer film and a manufacture method. The liquid crystal polymer film comprises first oriented films and second oriented films, wherein the first oriented films and the second oriented films are in sequentially staggered and laminated arrangement; the orientation directions of the first oriented films and the adjacent second oriented films intersect with each other, and the first oriented films and the second oriented films are subjected to hot press molding to obtain the liquid crystal polymer film. The liquid crystal polymer film has considerable mechanical properties in the MD direction and the TD direction, thereby being applicable to manufacture of flexible circuit boards; the manufacture method of the liquid crystal polymer film is simple, the manufacture cost is low, and the liquid crystal polymer film is easy to produce in a large scale.

Description

technical field [0001] The invention relates to the technical field of material processing, in particular to a liquid crystal polymer film and a manufacturing method. Background technique [0002] Liquid Crystalline Polymer (LCP) is a new type of polymer material developed in the early 1980s. Due to its low dielectric constant and dielectric loss at high frequencies (1-40 GHz), liquid crystal polymer films are widely used in high-frequency and high-speed communication flexible circuit boards. [0003] The main preparation methods of liquid crystal polymer film are extrusion blow molding method and extrusion casting double drawing method. The Chinese invention patent with the application number 03156468.2 discloses a method for producing a blown film. The produced blown film has a smooth surface without forming gaps and / or wrinkles. The Chinese invention patent with application number 200410080693.6 discloses a method for manufacturing thermoplastic liquid crystal polymer f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B7/03B32B37/06B32B37/10B32B27/06
CPCB32B27/08B32B37/06B32B37/10B32B2457/08
Inventor 虞成城刘开煌宋喆
Owner SHENZHEN SUNWAY COMM
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