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Forming method of liquid crystal polymer film and film blowing equipment

A liquid crystal polymer and molding method technology, applied in the field of polymer film processing, can solve the problems of low peel strength and delamination, achieve controllable crystallization and solidification, significant technological progress, and weaken the effect of delamination

Pending Publication Date: 2021-03-05
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the liquid crystal polymer solidifies rapidly when it is lower than the melting point, and it is easy to delaminate in the thickness direction during film processing, and the single-layer liquid crystal polymer film also has low peel strength with copper foil when it is processed with copper clad laminates. And other issues

Method used

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  • Forming method of liquid crystal polymer film and film blowing equipment
  • Forming method of liquid crystal polymer film and film blowing equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] A single-layer liquid crystal polymer film with an adhesive layer is prepared by using a method for forming a liquid crystal polymer film and a film blowing device provided in the above-mentioned specific embodiments. The structural combination of the multi-layer co-extruded composite film is: III A (polyethylene) / II A (Binder) / I (Liquid Crystal Polymer) / II B (adhesive) / III B (Polyethylene); the liquid crystal polymer material is a liquid crystal copolyester of p-hydroxybenzoic acid and 2-hydroxy-6-naphthoic acid, the melting point is 260°C, and the crystallization temperature is T c The temperature is 215°C, the adhesive material is ethylene / vinyl acetate copolymer, the melting point is 95°C, and the polyethylene is low-density polyethylene containing 1% opening agent, and the melting point is 112°C; The drying pretreatment was carried out in a drying oven, the drying temperature was 130°C, and the drying time was 5 hours. The pretreated liquid crystal polymer mate...

Embodiment 2

[0082] The multi-layer liquid crystal polymer film is prepared by using a method for forming a liquid crystal polymer film and a film blowing device provided in the above-mentioned specific embodiments. The difference between this embodiment and Embodiment 1 is that the extrusion pressure range is 0.1~ 2.5MPa, the air outlet temperature of the first air ring is 200°C, the air outlet temperature of the second air ring is 50°C, the inflation ratio of the film bubble is 1.2, and the total thickness is about 90μm. The tensile strength of the film along the pulling direction is 327MPa, the elongation at break is 21%, the tensile strength perpendicular to the pulling direction is 189MPa, and the elongation at break is 25%, indicating that the obtained liquid crystal polymer film has excellent mechanical properties.

Embodiment 3

[0084] A method for forming a liquid crystal polymer film and a film blowing device provided in the above-mentioned specific embodiments are used to prepare a multilayer liquid crystal polymer film. The difference between this embodiment and Embodiment 1 is that the inflation ratio of the film bubble is 8. Finally, a liquid crystal polymer film with a total thickness of about 35 μm with adhesive layers on both sides is obtained. The tensile strength of the film along the pulling direction is 227 MPa, the elongation at break is 36%, and the tensile strength perpendicular to the pulling direction is 219 MPa. , the elongation at break is 35%, indicating that the obtained liquid crystal polymer film has excellent mechanical properties.

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Abstract

The invention discloses a forming method of a liquid crystal polymer film and film blowing equipment. The film blowing equipment comprises an extruder, a co-extrusion die head, a first air ring and asecond air ring, wherein the co-extrusion die head is arranged at the tail end of the extruder and comprises a plurality of sub-runners and a co-extrusion runner, and the tail ends of the sub-runnersare connected with the starting end of the co-extrusion runner; the number of the sub-runners is greater than or equal to 5; the first air ring is connected with an opening die of the co-extrusion diehead; and the second air ring is arranged above the first air ring. According to the forming method of the liquid crystal polymer film and the film blowing equipment, the single-layer or multi-layerliquid crystal polymer film with continuously adjustable anisotropy can be directly prepared by adjusting the blow-up ratio, the die head temperature and the co-extrusion layer combination. Compared with the prior art, the forming method and the film blowing equipment have substantive features and remarkable technical progress.

Description

technical field [0001] The invention relates to the technical field of polymer film processing, in particular to a method for forming a liquid crystal polymer film and a film blowing device. Background technique [0002] With the gradual development of communication equipment and technology, the production and preparation of high-performance high-frequency substrate materials has become an indispensable part of the development of high-frequency wireless communications. Most of the traditional flexible circuit board substrates use polyimide film as the insulating substrate of the metal-clad plate. However, due to the high hygroscopicity of polyimide film and poor high-frequency dielectric properties, it is difficult to meet the requirements of the wireless communication industry. High frequency and high speed application requirements. Liquid crystal polymer films rely on their extremely low dielectric constant and dielectric loss (the dielectric constant is about 3 in the fr...

Claims

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Application Information

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IPC IPC(8): B29C55/28B29C48/335B29C48/18B29C35/16B29C48/69
CPCB29C35/16B29C55/28B29C2035/1658B29C48/18B29C48/338B29C48/69
Inventor 李良彬赵浩远
Owner UNIV OF SCI & TECH OF CHINA
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