阅读说明：本技术 用于5g天线的薄膜制备方法 (Preparation method of film for 5G antenna ) 是由 罗伟 任月璋 于 2020-12-03 设计创作，主要内容包括：本发明公开了一种用于5G天线的薄膜制备方法,通过螺杆挤出机将LCP树脂加热熔融,经过T型模头将熔融化的LCP树脂浇到钢带压合机,通过钢带压合机的进一步加热,压合成不同厚度规格的LCP膜；采用此工艺挤压成型的LCP膜,没有双向拉膜及吹塑法形成的膜的各项异性,同时保证膜的均匀性。(The invention discloses a film preparation method for a 5G antenna, which comprises the steps of heating and melting LCP resin by a screw extruder, pouring the molten LCP resin to a steel belt laminating machine through a T-shaped die head, and laminating LCP films with different thickness specifications by further heating the steel belt laminating machine; the LCP film extruded and formed by the process has no anisotropy of films formed by bidirectional film drawing and blow molding, and simultaneously ensures the uniformity of the films.)

1. The preparation method of the film for the 5G antenna is characterized by comprising the following steps of:

heating the film raw material through a screw extruder to melt and plasticize the film raw material into a flowing state;

pouring the melted and plasticized material on the surface of the lower steel belt of the steel belt pressing machine through a T-shaped die head;

the steel belt pressing machine adopts an upper group of metal steel belts with high polishing characteristics and a lower group of metal steel belts with high polishing characteristics to match with a rotating driving roller to form an annular pressing device;

the molten and plasticized material is extruded into a film through steel belts rotating in the same direction, a heating area and a cooling area are arranged on the back surfaces of the upper steel belt and the lower steel belt, and the heating area and the cooling area are respectively provided with a heating mechanism and a cooling mechanism, and the heating mechanism heats the surface of the steel belts so as to ensure that the material has enough temperature to be extruded into the film;

the heating zone is also provided with an extrusion mechanism which acts on the upper surface and the lower surface of the upper steel belt and the lower steel belt respectively to form enough pressure and ensure the effective molding of the film.

2. The method for manufacturing a film for a 5G antenna according to claim 1, wherein: the heating temperature of the heating zone is not lower than 400 ℃, and the extrusion mechanism ensures that the pressure between the upper steel belt and the lower steel belt is not lower than 80 bar.

Technical Field

The invention relates to a preparation method of a film for a 5G antenna, and belongs to the technical field of preparation of high polymer materials.

Background

The high polymer film for the 5G antenna, such as liquid crystal polymer/high polymer LCP, is a wholly aromatic liquid crystal polyester polymer material consisting of rigid high polymer chain structure; a new kind of high-performance special engineering plastics, it has low hygroscopicity, high chemical resistance, characteristic of the high gas barrier property, it is a dielectric material of low dielectric constant and low dielectric loss factor, make 5G technology higher frequency, higher speed; the antenna can be widely applied to mobile phone antennas, camera soft boards, high-speed transmission lines of notebook computers and intelligent watch antennas in future.

However, in the present LCP preparation process, due to the molecular rod-like characteristics, anisotropy of transverse and longitudinal tensile strength is easily formed, thereby causing product defects, i.e. stripes are easily formed along the MD direction (mechanical direction, roller direction), and tensile fracture is easily formed along the TD direction (film width direction); it is not easily stretch broken in the MD direction, or easily torn in the MD direction.

In the prior art, the processing mode of LCP film is realized by biaxial stretching process or blown film process; the biaxial stretching processing technology has high requirements on equipment and large investment, and a corresponding carrier film is required in the biaxial stretching process, so that the processing cost of the film is increased; the plastic process has high requirements on the processing characteristics of LCP materials, poor formability of the materials, low yield, very strict requirements on the whole equipment and processing conditions, and the thickness uniformity of products cannot be effectively ensured.

Disclosure of Invention

In view of the above technical problems, the present invention aims to: a preparation method of a thin film with a high CTI value and a high flame-retardant grade for a 5G antenna is provided.

The technical solution of the invention is realized as follows: a preparation method of a film for a 5G antenna comprises the following processes:

heating the film raw material through a screw extruder to melt and plasticize the film raw material into a flowing state;

pouring the melted and plasticized material on the surface of the lower steel belt of the steel belt pressing machine through a T-shaped die head;

the steel belt pressing machine adopts an upper group of metal steel belts with high polishing characteristics and a lower group of metal steel belts with high polishing characteristics to match with a rotating driving roller to form an annular pressing device;

the molten and plasticized material is extruded into a film through steel belts rotating in the same direction, a heating area and a cooling area are arranged on the back surfaces of the upper steel belt and the lower steel belt, and the heating area and the cooling area are respectively provided with a heating mechanism and a cooling mechanism, and the heating mechanism heats the surface of the steel belts so as to ensure that the material has enough temperature to be extruded into the film;

the heating zone is also provided with an extrusion mechanism which acts on the upper surface and the lower surface of the upper steel belt and the lower steel belt respectively to form enough pressure and ensure the effective molding of the film.

Preferably, the heating temperature of the heating zone is not lower than 400 ℃, and the extrusion mechanism ensures that the pressure between the upper steel belt and the lower steel belt is not lower than 80 bar.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

the LCP resin is heated and melted by a screw extruder, the melted LCP resin is poured to a steel belt pressing machine through a T-shaped die head, and LCP films with different thickness specifications are pressed and synthesized by further heating the steel belt pressing machine; the LCP film extruded and formed by the process has no anisotropy of films formed by bidirectional film drawing and blow molding, and simultaneously ensures the uniformity of the films.

Drawings

The technical scheme of the invention is further explained by combining the accompanying drawings as follows:

FIG. 1 is a schematic flow chart of a method for manufacturing a thin film for a 5G antenna according to the present invention.

Detailed Description

The invention is described below with reference to the accompanying drawings.

As shown in fig. 1, the method for preparing a film for a 5G antenna according to the present invention comprises the following steps:

heating the film raw material by a single/double screw extruder to melt and plasticize the film raw material into a flowing state; the film material of the present example is LCP resin;

pouring the melted and plasticized material on the surface of the lower steel belt of the steel belt pressing machine through a T-shaped die head;

the steel belt pressing machine adopts an upper group of metal steel belts with high polishing characteristics and a lower group of metal steel belts with high polishing characteristics to match with a rotating driving roller to form an annular pressing device;

the molten and plasticized material is extruded into a film through steel belts rotating in the same direction, a heating area and a cooling area are arranged on the back surfaces of the upper steel belt and the lower steel belt, and the heating area and the cooling area are respectively provided with a heating mechanism and a cooling mechanism, and the heating mechanism heats the surface of the steel belts so as to ensure that the material has enough temperature to be extruded into the film;

the heating zone is also provided with an extrusion mechanism which acts on the upper surface and the lower surface of the upper steel belt and the lower steel belt respectively to form enough pressure and ensure the effective molding of the film.

Wherein the heating temperature of the heating zone is not lower than 400 ℃, and the extrusion mechanism ensures that the pressure between the upper steel belt and the lower steel belt is not lower than 80 bar.

The scheme can realize similar film processing for a plurality of materials, the material is not limited to LCP resin, and extrusion film forming of various materials such as PC, PMMA, PEEK, PPS, PEKK and PPO can be realized.

The above-mentioned embodiments are merely illustrative of the technical idea and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.