阅读说明：本技术 一种耐高温的聚酰亚胺显示面板薄膜及其生产工艺 (High-temperature-resistant polyimide display panel film and production process thereof ) 是由 孟凡伟 沈明 于 2021-07-21 设计创作，主要内容包括：本发明公开了一种耐高温的聚酰亚胺显示面板薄膜及其生产工艺,属于显示面板薄膜技术领域,包括聚酰亚胺层和复合层,复合层包括如下质量份数的原料：聚酰亚胺溶液50～80份、石英玻璃颗粒20～40份、无机透明填料0～10份。在原有的聚酰亚胺中增加正三棱锥结构的石英玻璃颗粒,不仅其自身具有超高的导光性能,而且能够利用其存在的斜面多次反射光线,提高显示显示面板薄膜的亮度,提高薄膜透光率；利用石英玻璃耐高温特性,提高薄膜的使用安全性。(The invention discloses a high-temperature-resistant polyimide display panel film and a production process thereof, belonging to the technical field of display panel films and comprising a polyimide layer and a composite layer, wherein the composite layer comprises the following raw materials in parts by weight: 50-80 parts of polyimide solution, 20-40 parts of quartz glass particles and 0-10 parts of inorganic transparent filler. The quartz glass particles with the regular triangular pyramid structure are added in the original polyimide, so that the polyimide has ultrahigh light-guiding performance, and the inclined planes of the polyimide can be used for reflecting light for multiple times, so that the brightness of a display panel film is improved, and the light transmittance of the film is improved; the use safety of the film is improved by utilizing the high-temperature resistance characteristic of the quartz glass.)

1. The high-temperature-resistant polyimide display panel film is characterized by comprising a polyimide layer (1) and a composite layer (2), wherein the thickness ratio of the polyimide layer (1) to the composite layer (2) is 1: 1-0.5, and the composite layer (2) comprises the following raw materials in parts by mass: 50-80 parts of polyimide solution, 20-40 parts of quartz glass particles and 0-10 parts of inorganic transparent filler.

2. The high temperature resistant polyimide display panel film according to claim 1, wherein the quartz glass particles are regular triangular pyramids, and the edge length of the regular triangular pyramids is 0.05mm to 0.15 mm.

3. The high-temperature-resistant polyimide display panel film according to claim 1, wherein the polyimide layer (1) comprises the following raw materials in parts by mass: 90-100 parts of polyimide solution and 0-10 parts of inorganic transparent filler.

4. The high-temperature-resistant polyimide display panel film according to claim 1, wherein the composite layer (2) comprises the following raw materials in parts by mass: 60 parts of polyimide solution and 40 parts of quartz glass particles.

5. The high-temperature-resistant polyimide display panel film according to claim 1, wherein the composite layer (2) comprises the following raw materials in parts by mass: 70 parts of polyimide solution and 30 parts of quartz glass particles.

6. The high-temperature-resistant polyimide display panel film according to claim 1, wherein the composite layer (2) comprises the following raw materials in parts by mass: 80 parts of polyimide solution and 20 parts of quartz glass particles.

7. The high-temperature-resistant polyimide display panel film according to claim 1, wherein the composite layer (2) comprises the following raw materials in parts by mass: 55 parts of polyimide solution, 40 parts of quartz glass particles and 5 parts of inorganic transparent filler, wherein the inorganic transparent filler is high-temperature-resistant transparent AB glue.

8. The high-temperature-resistant polyimide display panel film according to claim 1, wherein the composite layer (2) comprises the following raw materials in parts by mass: 52 parts of polyimide solution, 40 parts of quartz glass particles and 8 parts of inorganic transparent filler, wherein the inorganic transparent filler is high-temperature-resistant transparent AB glue and glass fiber, and comprises the following raw materials in parts by mass: 5 parts of high-temperature-resistant transparent AB glue and 3 parts of glass fiber.

9. A process for producing the high temperature resistant polyimide display panel film according to any one of claims 1 to 8, comprising the steps of:

s101: melting quartz, taking the quartz, heating to 1600 +/-10 ℃ to melt the quartz into quartz glass liquid, and slowly pouring the quartz glass liquid on a flat plate for leveling;

s102: processing particles, namely enabling an alloy steel roller with cooling liquid flowing in a circulating mode inside and dense regular triangular pyramid grooves arranged on the surface to roll along quartz glass liquid, and cutting, cooling and solidifying the quartz glass liquid into regular triangular pyramid particles;

s103: processing a composite layer (2), mixing a polyimide solution, quartz glass particles and an inorganic transparent filler in a certain proportion by mass to obtain a mixed solution;

s104: and (3) processing a film, namely slowly pouring the mixed solution on a flat plate to shake and level, casting a polyimide solution on the flat plate after the flat plate is semi-solidified, and slowly stretching the flat plate after casting to form the film so as to obtain the polyimide display panel film.

Technical Field

The invention relates to the technical field of display panel films, in particular to a high-temperature-resistant polyimide display panel film and a production process thereof.

Background

The polyimide film includes a pyromellitic polyimide film and a biphenyl polyimide film. The former is prepared from pyromellitic anhydride and diaminodiphenyl ether. The latter is prepared from biphenyl tetracarboxylic dianhydride and diphenyl ether diamine (R type)) or m-phenylenediamine (S type), and the film preparation method comprises the following steps: and (3) carrying out tape casting film formation and stretching on the polyamic acid solution, and then carrying out high-temperature imidization. The film is yellow and transparent, has the relative density of 1.39-1.45, has outstanding high temperature resistance, radiation resistance, chemical corrosion resistance and electrical insulation performance, and can be used in air at 250-280 ℃ for a long time. The glass transition temperatures were 280 ℃ (Uplix R), 385 ℃ (Kapton) and 500 ℃ or higher (Uplix S), respectively. The tensile strength is 200MPa at 20 ℃ and is more than 100MPa at 200 ℃. The material is particularly suitable for being used as a base material of a flexible printed circuit board and insulating materials of various high-temperature resistant motors and electrical appliances. However, when the film is used as a display panel film and is attached to a liquid crystal panel, the high temperature resistance of the film cannot meet the use safety requirements of temperature resistance, temperature insulation and heat resistance of the existing liquid crystal screen, and the film is transparent yellow, low in transparency and light transmittance and large in loss when light passes through the polyimide film.

Disclosure of Invention

The invention aims to provide a high-temperature-resistant polyimide display panel film and a production process thereof, wherein quartz glass particles with a regular triangular pyramid structure are added in original polyimide, so that the polyimide display panel film has ultrahigh light guiding performance, and can reflect light for multiple times by utilizing inclined planes of the polyimide display panel film, thereby improving the brightness of the display panel film and the light transmittance of the film; the quartz glass has high temperature resistance, so that the use safety of the film is further improved, heat resistance and heat insulation are realized, and heat conduction is reduced, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the high-temperature-resistant polyimide display panel film comprises a polyimide layer and a composite layer, wherein the thickness ratio of the polyimide layer to the composite layer is 1: 1-0.5, and the composite layer comprises the following raw materials in parts by weight: 50-80 parts of polyimide solution, 20-40 parts of quartz glass particles and 0-10 parts of inorganic transparent filler.

Furthermore, the quartz glass particles are regular triangular pyramids, and the edge lengths of the regular triangular pyramids are 0.05 mm-0.15 mm.

Further, the polyimide layer comprises the following raw materials in parts by mass: 90-100 parts of polyimide solution and 0-10 parts of inorganic transparent filler.

Further, the composite layer comprises the following raw materials in parts by weight: 60 parts of polyimide solution and 40 parts of quartz glass particles.

Further, the composite layer comprises the following raw materials in parts by weight: 70 parts of polyimide solution and 30 parts of quartz glass particles.

Further, the composite layer comprises the following raw materials in parts by weight: 80 parts of polyimide solution and 20 parts of quartz glass particles.

Further, the composite layer comprises the following raw materials in parts by weight: 55 parts of polyimide solution, 40 parts of quartz glass particles and 5 parts of inorganic transparent filler, wherein the inorganic transparent filler is high-temperature-resistant transparent AB glue.

Further, the composite layer comprises the following raw materials in parts by weight: 52 parts of polyimide solution, 40 parts of quartz glass particles and 8 parts of inorganic transparent filler, wherein the inorganic transparent filler is high-temperature-resistant transparent AB glue and glass fiber, and comprises the following raw materials in parts by mass: 5 parts of high-temperature-resistant transparent AB glue and 3 parts of glass fiber.

According to another aspect of the present invention, there is provided a process for producing a high temperature resistant polyimide display panel film, comprising the steps of:

s101: melting quartz, taking the quartz, heating to 1600 +/-10 ℃ to melt the quartz into quartz glass liquid, and slowly pouring the quartz glass liquid on a flat plate for leveling;

s102: processing particles, namely enabling an alloy steel roller with cooling liquid flowing in a circulating mode inside and dense regular triangular pyramid grooves arranged on the surface to roll along quartz glass liquid, and cutting, cooling and solidifying the quartz glass liquid into regular triangular pyramid particles;

s103: processing a composite layer, namely mixing a polyimide solution, quartz glass particles and an inorganic transparent filler in a certain proportion by mass to obtain a mixed solution;

s104: and (3) processing a film, namely slowly pouring the mixed solution on a flat plate to shake and level, casting a polyimide solution on the flat plate after the flat plate is semi-solidified, and slowly stretching the flat plate after casting to form the film so as to obtain the polyimide display panel film.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the high-temperature-resistant polyimide display panel film and the production process thereof, the quartz glass particles with the regular triangular pyramid structure are added in the original polyimide, so that the polyimide display panel film has ultrahigh light guiding performance, and the inclined planes of the polyimide display panel film can be used for reflecting light for multiple times, so that the brightness of the display panel film is improved, and the light transmittance of the film is improved.

2. According to the high-temperature-resistant polyimide display panel film and the production process thereof, provided by the invention, the high-temperature-resistant characteristic of quartz glass is utilized, the use safety of the film is further improved, heat resistance and heat insulation are realized, and the heat conduction is reduced.

Drawings

FIG. 1 is an overall structural view of a high temperature resistant polyimide display panel film according to the present invention;

FIG. 2 is a flow chart of the production process of the high temperature resistant polyimide display panel film of the present invention.

In the figure: 1. a polyimide layer; 2. and (4) compounding layers.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

Referring to fig. 1, a high temperature resistant polyimide display panel film includes a polyimide layer 1 and a composite layer 2, a thickness ratio of the polyimide layer 1 to the composite layer 2 is 1:0.5, and the composite layer 2 includes the following raw materials in parts by weight: 60 parts of polyimide solution, 40 parts of quartz glass particles and 0 part of inorganic transparent filler.

The quartz glass particles are regular triangular pyramids, and the edge length of each regular triangular pyramid is 0.12 mm.

The polyimide layer 1 comprises the following raw materials in parts by mass: 100 parts of polyimide solution and 0 part of inorganic transparent filler, wherein the inorganic transparent filler is high-temperature-resistant transparent AB adhesive.

Referring to fig. 2, in order to better show the process flow of the production of the high temperature resistant polyimide display panel film, the present embodiment now provides a process for producing a high temperature resistant polyimide display panel film, which includes the following steps:

s101: melting quartz, taking the quartz, heating to 1600 +/-10 ℃ to melt the quartz into quartz glass liquid, and slowly pouring the quartz glass liquid on a flat plate for leveling;

s102: processing particles, namely enabling an alloy steel roller with cooling liquid flowing in a circulating mode inside and dense regular triangular pyramid grooves arranged on the surface to roll along quartz glass liquid, and cutting, cooling and solidifying the quartz glass liquid into regular triangular pyramid particles;

s103: processing the composite layer 2, mixing a polyimide solution, quartz glass particles and an inorganic transparent filler in a certain proportion by mass to obtain a mixed solution;

s104: and (3) processing a film, namely slowly pouring the mixed solution on a flat plate for vibration leveling, casting a polyimide solution on the flat plate after the mixed solution is semi-solidified, and slowly stretching the mixed solution to obtain a polyimide display panel film after casting film formation, wherein vibration can promote the mixed solution to be quickly leveled and can prevent the stacking of the regular triangular pyramid particles, one surface of each regular triangular pyramid particle is parallel to the upper surface of the flat plate, and simultaneously, the glass fiber is settled between two adjacent regular triangular pyramid particles (under the condition that the glass fiber is contained in the embodiment).

Example two

The difference between this embodiment and the first embodiment is only that the mass parts of the composite layer 2 in this embodiment are different, and the composite layer 2 in this embodiment includes the following raw materials in mass parts: 70 parts of polyimide solution, 30 parts of quartz glass particles and 0 part of inorganic transparent filler.

EXAMPLE III

The difference between this embodiment and the first embodiment is only that the mass parts of the composite layer 2 in this embodiment are different, and the composite layer 2 in this embodiment includes the following raw materials in mass parts: 80 parts of polyimide solution, 20 parts of quartz glass particles and 0 part of inorganic transparent filler.

Example four

The difference between this embodiment and the first embodiment is only that the composite layer 2 and the polyimide layer 1 in this embodiment are both additionally provided with a high temperature resistant transparent AB glue, and the composite layer 2 in this embodiment includes the following raw materials in parts by mass: 55 parts of polyimide solution, 40 parts of quartz glass particles and 5 parts of inorganic transparent filler, wherein the inorganic transparent filler is high-temperature-resistant transparent AB glue, and the high-temperature-resistant transparent AB glue can increase the viscosity of the film and prevent the quartz glass particles from separating from the film during stretching.

The polyimide layer 1 comprises the following raw materials in parts by mass: 95 parts of polyimide solution and 5 parts of inorganic transparent filler, wherein the inorganic transparent filler is high-temperature-resistant transparent AB glue, the polyimide layer 1 can be omitted, and the composite layer 2 forms the whole high-temperature-resistant polyimide display panel film.

EXAMPLE five

The difference between this embodiment and the fourth embodiment is only that the composite layer 2 in this embodiment includes 3 parts of glass fiber, and the composite layer 2 in this embodiment includes the following raw materials in parts by mass: 52 parts of polyimide solution, 40 parts of quartz glass particles and 8 parts of inorganic transparent filler, wherein the inorganic transparent filler is high-temperature-resistant transparent AB glue and glass fiber, and comprises the following raw materials in parts by mass: 5 parts of high-temperature-resistant transparent AB glue and 3 parts of glass fiber, wherein the glass fiber can increase the connection strength between adjacent quartz glass particles.

Comparative example

The polyimide display panel film in the present comparative example includes only a polyimide solution, and after casting a polyamic acid solution into a film, stretching, and imidizing at a high temperature.

The components of the polyimide display panel films in the above examples and comparative examples were counted in parts by mass, and the obtained data are shown in table 1 below:

TABLE 1 statistical data of parts by mass of components in polyimide display panel films

The high-temperature-resistant polyimide display panel film is produced by adopting the raw materials in the first to fifth embodiments and the comparative example, 100 polyimide display panel films with the same area and thickness are selected in each embodiment, and then various performances of the polyimide display panel films are detected by the following methods: 1 the film is tested for light transmittance with a wavelength of λ intensity of I. When the monochromatic light of (a) is irradiated on the thin film, a part of the light is absorbed, a part of the light is transmitted, the transmitted light intensity is I, and the light transmittance T is 100 percent (I/I); and 2, testing the temperature resistance of the film, attaching the film to flat plates with different grades of temperatures, and detecting the shrinkage rate and the outer surface temperature of the film. The statistical test result data are shown in the following table 2:

TABLE 2 polyimide display Panel film Properties

According to the detection data in the above examples one to five and the comparative example, as the number of the quartz glass particles increases, the mass fraction of the polyimide decreases, the shrinkage rate gradually increases at different temperatures, the temperature resistance decreases, and the transmittance gradually increases, and compared with the comparative example, the transmittance of the film increases from 85% to 95% after the quartz glass particles are increased, and the high temperature resistance increases.

In summary, the following steps: according to the high-temperature-resistant polyimide display panel film and the production process thereof, the quartz glass particles with the regular triangular pyramid structure are added in the original polyimide, so that the polyimide display panel film has ultrahigh light guiding performance, and can reflect light for multiple times by utilizing the inclined planes of the polyimide display panel film, thereby improving the brightness of the display panel film and improving the light transmittance of the film; the high temperature resistance of the quartz glass is utilized to further improve the use safety of the film, realize heat resistance and heat insulation and reduce heat conduction.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.