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Film blow molding device and liquid crystal polymer film prepared therefrom

A liquid crystal polymer and film blow molding technology, applied in the field of blow molding process, can solve the problems of easy film breakage, serious film anisotropy, poor flatness of bubble film, etc., and achieve the effect of reducing the cooling speed

Active Publication Date: 2022-08-05
NINGBO CHANGYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the extremely fast cooling and solidification speed, strong molecular orientation, and high rigidity of liquid crystal polymers in extrusion molding, traditional film blowing machines that lack targeted process control have problems when blowing liquid crystal polymer films. During the expansion process, it is easy to break the film, uneven thickness, serious anisotropy of film MD / TD, poor flatness and serious folds caused by violent torsion of the bubble film, etc.
[0005] Therefore, research and development of a film blowing molding device for the preparation of liquid crystal polymer film, in order to alleviate the liquid crystal polymer in extrusion molding has extremely fast cooling and solidification speed, strong molecular orientation and high rigidity and other characteristics , resulting in problems such as easy film rupture during the inflation process, uneven thickness, and serious film MD / TD anisotropy when blowing liquid crystal polymer films, which have become very necessary and urgent

Method used

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  • Film blow molding device and liquid crystal polymer film prepared therefrom
  • Film blow molding device and liquid crystal polymer film prepared therefrom
  • Film blow molding device and liquid crystal polymer film prepared therefrom

Examples

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preparation example Construction

[0072] According to one aspect of the present invention, a preparation method of the above liquid crystal polymer film, the preparation method comprises the following steps:

[0073] The molten liquid crystal polymer resin is extruded through the annular die 111, and the extruded tubular blank film is inflated under the heating gas blown by the thermal insulation blowing air ring 112 to form film bubbles; then the film bubbles are sequentially insulated by sizing The upper annular opening of the cylinder 113 and the thermal insulation box 11 reaches the pulling adjustment unit 2; then the pulling adjustment unit 2 pulls the film bubble obtained by blowing to the annealing unit 3 to obtain a formed liquid crystal polymer film.

[0074] In the preparation method of the liquid crystal polymer film provided by the present invention, the preparation method first extrudes the molten liquid crystal polymer resin through the annular die 111 , and the extruded tubular blank film is heat...

Embodiment 1

[0081] like figure 1 and figure 2 As shown, a film blow molding device includes a blow molding unit 1, a traction adjustment unit 2 and an annealing unit 3;

[0082] The blow molding unit 1 includes a thermal insulation box 11, and the thermal insulation box 11 is provided with an annular die 111, a thermal insulation blowing air ring 112 and a sizing thermal insulation cylinder 113 coaxially arranged in sequence from bottom to top;

[0083] The annular die 111 is communicated with the extrusion port pipeline of the extruder 4;

[0084] The thermal insulation blow molding air ring 112 communicates with the fan 5 through the heating pipe 114;

[0085] The traction adjustment unit 2 is arranged on the blow molding unit 1 , and the traction adjustment unit 2 pulls the film bubble obtained by blow molding to the annealing unit 3 through the annular opening provided on the upper part of the thermal insulation box 11 .

[0086]The film blow molding device of this embodiment incl...

Embodiment 2

[0105] A liquid crystal polymer film, the liquid crystal polymer film is prepared by the film blow molding device described in Embodiment 1;

[0106] The preparation method of the liquid crystal polymer film comprises the following steps:

[0107] (1) The liquid crystal polymer resin is vacuum dried in a vacuum oven, the treatment temperature is 140-160°C, and the treatment time is 4-12h. The liquid crystal polymer resin is mainly synthesized from 73% p-hydroxybenzoic acid and 27% 6-hydroxy-2-naphthoic acid by solid-phase polycondensation method, and a small amount of a third monomer can also be introduced on the basis of the above two monomers. The melting point is 280-283°C.

[0108] Subsequently, the dried liquid crystal polymer resin raw material is melted at a barrel temperature of 280-295° C. through a single-screw extruder 4 to make it uniformly plasticized. The diameter of the screw is 35 mm and the aspect ratio is 32. , remove the infusible matter and impurities thr...

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Abstract

The invention provides a film blow molding device and a liquid crystal polymer film prepared therefrom, and relates to the technical field of blow molding technology. The film blow molding device includes a blow molding unit, a traction adjustment unit and an annealing unit; the blow molding unit includes a thermal insulation box, and the thermal insulation box is coaxially provided with an annular die head and thermal insulation blow molding from bottom to top. At the same time, a traction adjustment unit is arranged on the blow molding unit, and the traction adjustment unit draws the film bubble obtained by blow molding to the annealing unit through the annular opening provided on the upper part of the insulation box. Therefore, through the film blow molding device of the present application, the film blow molding process of the present application can be carried out under the condition of heat preservation, which effectively reduces the cooling and solidification speed of the liquid crystal polymer blank film, and relieves the existing preparation method in blowing liquid crystal. When the polymer film is inflated, it is easy to break the film, the thickness is uneven, and the MD / TD anisotropy of the film is serious.

Description

technical field [0001] The invention relates to the technical field of blow molding technology, in particular to a film blow molding device and a liquid crystal polymer film prepared therefrom. Background technique [0002] 5G communication is an important basic network that will carry ultra-high-speed mobile communication, Internet of Things, artificial intelligence, intelligent transportation, telemedicine and other emerging industries in the future. It has received great attention and continuous investment from major powers in the world. Compared with 4G communication, the biggest features of 5G communication are high frequency, high speed, large bandwidth and low latency. The frequency will gradually transition to above 24GHz, and the overall communication speed will be 100 times that of 4G. [0003] Thermotropic liquid crystal polymer (TLCP) films are considered to be the most suitable radio frequency for 5G terminal electronic devices due to their lower dielectric loss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C48/10B29C48/00B29C48/355B29C48/885
CPCB29C48/10B29C48/0017B29C48/355B29C48/885
Inventor 王雄伟周玉波
Owner NINGBO CHANGYANG TECH
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