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Polyimide film and preparation method thereof and flexible display panel

A technology of polyimide film and manufacturing method, applied in the field of materials, can solve problems such as difficulty in taking into account mechanical properties, thermal properties, optical properties, etc.

Active Publication Date: 2020-12-04
WUHAN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Known polyimide film materials on the market are usually difficult to balance mechanical properties, thermal properties, and optical properties

Method used

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  • Polyimide film and preparation method thereof and flexible display panel
  • Polyimide film and preparation method thereof and flexible display panel
  • Polyimide film and preparation method thereof and flexible display panel

Examples

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preparation example Construction

[0075] The preparation method of the polyimide film of the present application uses the diamine containing porphine nickel (II) structure as a raw material to prepare the polyimide film. When porphine nickel (II) is catalytically hydrogenated in common solvents, porphine nickel (II) is preferentially hydrogenated, but the benzene ring is preferentially hydrogenated in trifluoroacetic acid. This application introduces a nitrating agent into trifluoroacetic acid to synthesize nitrated porphine nickel (II), and then uses a hydrazine salt to prepare a diamine containing porphine nickel (II), and then introduces a halogen-containing dianhydride structure to generate a polyimide precursor , and the polyimide precursor is cross-linked and solidified at high temperature, and finally a polyimide film material with excellent heat resistance, mechanical properties and optical properties is obtained.

[0076] The present application also provides a polyimide film, which can be prepared by...

Embodiment 1

[0090] Embodiment 1 comprises the following steps:

[0091] 1.1 Preparation of Dinitroporphine Nickel(II)

[0092] The porphine nickel(II) used in Example 1 is 5,10,15,20-tetramethyl-21H,23H-porphine nickel(II), which can be purchased through commercial channels.

[0093] Under the protection of argon, add 0.3~1.1mol of 5,10,15,20-tetramethyl-21H,23H-porphine nickel (II) into the reaction vessel, and then add trifluoro The acetic acid solvent is used for dissolving, and the stirring is continued, and 0.1-2.5 mol of sodium nitrite completely dissolved in 2-5 mL of solvent is gradually added dropwise to the solution. After reacting at room temperature for 12-30 minutes, stop stirring, add 100 mL of deionized water to the reaction solution, stir well and then let it stand still, then use dichloromethane to extract, collect the organic layer, and spin evaporate to obtain the crude product. Then rinse with a mixed solution of dichloromethane / petroleum ether at a volume ratio of 5...

Embodiment 2

[0113] Embodiment 2 comprises the following steps:

[0114] 2.1 Preparation of Dinitroporphine Nickel(II)

[0115] The porphine nickel(II) used in Example 2 is 5,10,15,20-tetramethyl-21H,23H-porphine nickel(II), which can be purchased through commercial channels.

[0116] Under the protection of argon, add 0.3~1.1mol of 5,10,15,20-tetramethyl-21H,23H-porphine nickel (II) into the reaction vessel, and then add trifluoro Acetic acid solvent is used for dissolving, stirring continuously, and 2-5 mL of sodium nitrite is added to the solution once to completely dissolve 0.1-2.5 mol of sodium nitrite. After reacting at room temperature for 12-30 minutes, stop stirring, add 100 mL of deionized water to the reaction solution, stir well and then let it stand still, then use dichloromethane to extract, collect the organic layer, and spin evaporate to obtain the crude product. Then rinse with a mixed solution of dichloromethane / petroleum ether with a volume ratio of 5:3 to obtain a sol...

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Abstract

The invention provides a manufacturing method of a polyimide film and the polyimide film manufactured by the manufacturing method. The preparation method comprises the following steps: dissolving porphin nickel (II) in trifluoroacetic acid, and carrying out a nitration reaction with a nitrating agent to generate dinitroporphin nickel (II); enabling the dinitroporphin nickel (II) to react with hydrazine salt to generate diamino porphin nickel (II); polymerizing the diamino porphin nickel (II) and halogen-containing dianhydride to form a polyimide precursor; and performing intramolecular condensation on the polyimide precursor to form the polyimide film.

Description

technical field [0001] The application relates to the field of materials, in particular to a polyimide film, a preparation method thereof, and a flexible display panel. Background technique [0002] In the field of OLED panels, a commonly used flexible substrate uses polyimide film. Known polyimide film materials on the market are usually difficult to balance mechanical properties, thermal properties, and optical properties. The mechanical properties of the current polyimide film are evaluated by tensile properties. As a basic requirement, the maximum breaking stress of a 10 μm polyimide film reaches 350 MPa and above, and the elongation at break reaches more than 15%. Thermogravimetry (Thermo gravimetryAnalysis, TGA) evaluation, the temperature at which one percent of its mass loses weight should be above 560°C, and the thermal expansion coefficient should be within 5ppm / K. At the same time, in terms of optical properties, its transmittance should be in the range of 380nm ...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08L79/08C08J5/18H01L27/32G09F9/30
CPCC08J5/18C08G73/1085G09F9/301C08J2379/08H10K59/12Y02P70/50
Inventor 汪亚民陈诚
Owner WUHAN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD