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Liquid crystal polymer film and production method thereof

A technology of liquid crystal polymer and production method, applied in the field of material processing, can solve the problems of poor tear strength, delamination, and inability to meet the use requirements of flexible circuit boards, and achieve the effect of simple production process and good mechanical properties

Inactive Publication Date: 2019-04-19
SHENZHEN SUNWAY COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the high orientation of liquid crystal polymers under the action of shear force, the films prepared by conventional methods have high mechanical properties in the MD direction (Machine Direction, machine direction), while in the TD direction (Transverse Direction, perpendicular to the machine direction) ) The tear strength on it is very poor, that is, it is anisotropic, and the anisotropic film cannot meet the needs of flexible circuit boards
In addition, due to the high orientation of liquid crystal polymers, it also brings the risk of delamination in the thickness direction of the film

Method used

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  • Liquid crystal polymer film and production method thereof
  • Liquid crystal polymer film and production method thereof
  • Liquid crystal polymer film and production method thereof

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Embodiment 1

[0038] Please refer to figure 1 , Embodiment 1 of the present invention is:

[0039] A liquid crystal polymer film, comprising at least two first alignment units 1 and at least two second alignment units 2, the alignment direction of the first alignment unit 1 intersects the alignment direction of the second alignment unit 2 , at least two of the first orientation units 1 and at least two of the second orientation units 2 are arranged in a net-like weaving structure. Preferably, at least two first alignment units 1 are arranged parallel to each other, at least two second alignment units 2 are arranged parallel to each other, and the first alignment unit 1 is perpendicular to the second alignment unit 2 set up. In this embodiment, the cross-sectional areas of the first alignment unit 1 and the second alignment unit 2 are both 10 -6 ~1mm 2 . The reticular braided structure is hot-pressed to obtain the liquid crystal polymer film, and the material of the liquid crystal polym...

Embodiment 2

[0040] Please refer to figure 2 and image 3 , the second embodiment of the present invention is:

[0041] A method for making a liquid crystal polymer film, used to obtain the liquid crystal polymer film in Example 1, comprising the steps of:

[0042]First, melt spinning or electrospinning is performed using thermoplastic liquid crystal polymers to obtain highly oriented fibrous intermediate products, which can also be achieved by cutting anisotropic films. In this embodiment, the thermoplastic polymer is a liquid crystal polymer containing a benzene ring, a liquid crystal polymer containing a naphthalene ring, a liquid crystal polymer containing an aliphatic segment, or a liquid crystal polymer containing a cyclic polyester group. Melt spinning generally uses an extruder to plasticize the raw resin, and prepares liquid crystal polymer fibers through a spinning die. This method can easily obtain fibers with a circular cross-section, with a diameter ranging from 5 to 1000 μ...

Embodiment 3

[0046] Embodiment 3 of the present invention is a method for manufacturing a liquid crystal polymer film, and the difference from Embodiment 2 is:

[0047] A thermoplastic liquid crystal polymer resin (VECTRA A950) was spun at 310° C. using a melt spinning machine to obtain fibers with a circular cross-section and a diameter of 80 μm. Due to the shear force of the spinning die, the polymer segments inside the fiber are distributed in orientation. The spinning temperature is generally Tm~(Tm+80°C), where Tm is the melting point of the thermoplastic liquid crystal polymer. A weaving machine was used to weave the fibers in plain weave, and the distance between two adjacent orientation units was controlled to be 60 μm to obtain a net-like weave structure. Its effective thickness is 71.8 μm as measured by weighing.

[0048] A calender is used to press the intermediate products of the strips to prepare an isotropic liquid crystal polymer film. The calendering temperature is 220°C...

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Abstract

The invention discloses a liquid crystal polymer film and a production method thereof. The liquid crystal polymer film comprises at least two first orientation units and at least two second orientation units, the orientation directions of the first orientation units intersect with the orientation directions of the second orientations, the at least two first orientation units and the at least two second orientation units are arranged in a mesh woven structure, and the mesh woven structure is subjected to hot press molding to obtain the liquid crystal polymer film. The first orientation units and the second orientation units having different orientation directions are arranged in the mesh woven structure, the hot pressing molding is adopted to obtain the isotropic liquid crystal polymer filmwith same mechanical performances in an MD (machine direction) and in an TD (transverse direction), and the obtained film has no layering phenomenon in the thickness direction.

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 thereof. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L101/12C09K19/38
CPCC08J5/18C08J2300/12C09K19/38C09K2219/03
Inventor 刘开煌宋喆刘飞华苏聪王凤虞成城
Owner SHENZHEN SUNWAY COMM
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