LCP (Liquid Crystal Polymer) film as well as preparation method and application thereof

A film and film bubble technology, applied in the field of LCP film and its preparation, can solve the problems of anisotropy of mechanical properties, poor film thickness uniformity, poor film bubble stability, etc., to solve the problems of poor film thickness uniformity, high surface quality, good isotropic effect

Pending Publication Date: 2022-04-05
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the poor stability of the film bubble after the LCP melt is extruded from the annular die, the bubble is prone to shaking during the blow molding process, resulting in the formed blown film being prone to wrinkle and uniform film thickness. The problems of poor mechanical properties and anisotropy affect the subsequent application of the film and seriously reduce the market value of the LCP film

Method used

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  • LCP (Liquid Crystal Polymer) film as well as preparation method and application thereof
  • LCP (Liquid Crystal Polymer) film as well as preparation method and application thereof
  • LCP (Liquid Crystal Polymer) film as well as preparation method and application thereof

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form.

[0028] The preparation method of the LCP thin film of the embodiment of the present invention and comparative example: adopt as figure 1 In the equipment shown, the LCP resin is melted and plasticized by the extruder, extruded through the die 4 to form a bubble 1, and a gas medium is introduced into the bubble to inflate the bubble, cooled and shaped by the air ring 3, and the bubble reaches the human body. The letter plate 2 is flattened and flattened, and pulled out by a guide roller for winding and forming to obtain an LCP film. The physical parameters and LCP film blow molding conditions of the LCP resin used in each embodiment and comparative example are shown in Table 1 / Table 3.

[0029] In the examples and comp...

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Abstract

The invention discloses an LCP (Liquid Crystal Polymer) film as well as a preparation method and application thereof. According to the preparation method of the LCP film, an extrusion blow molding method is adopted, and the tensile viscosity and the tensile viscosity activation energy of an LCP resin melt at a certain temperature when the tensile rate is 0.1 s <-1 > and the tensile rate is 10 s <-1 > are required to be within a certain range; meanwhile, the blow molding temperature of the LCP film is controlled (the film bubble temperature Tn at the position, 100 mm away from an outlet of a mouth mold in the axial direction, of film bubbles is Tm-10 DEG C-Tm + 20 DEG C), the thickness uniformity deviation of the prepared LCP film is smaller than 10%, wrinkles on the surface of the film are extremely few, and the mechanical property has good isotropy; the problems that wrinkles are prone to being generated and the film thickness uniformity is poor when an existing extrusion blow molding method is used for preparing the LCP film are effectively solved, and follow-up application of the film is facilitated.

Description

technical field [0001] The invention relates to the technical field of film production and processing, in particular to an LCP film and its preparation method and application. Background technique [0002] Liquid crystal polymer (LCP) has excellent high-frequency dielectric properties, processing fluidity, high heat resistance and dimensional stability, and has a very wide range of applications in the field of electronic appliances. In the 5G commercial era, it is characterized by higher electromagnetic wave transmission speed and smaller signal propagation loss. It is required that the dielectric constant and dielectric loss of the material should be as small as possible. Liquid crystal polymer is the material that meets these stringent requirements. Therefore, the flexible printed circuit board (FPC) based on LCP film becomes the best material for 5G terminal antenna. [0003] The prior art generally adopts the extrusion blow molding method to prepare LCP films. However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/02B29C48/10B29C55/28B29C37/00B29L7/00
Inventor 唐大航肖中鹏姜苏俊陈平绪黄险波叶南飚
Owner KINGFA SCI & TECH CO LTD
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