Modified polyimide film and preparation method thereof

A polyimide film and modification technology are applied in the field of modified polyimide film and its preparation, which can solve the problem of polyimide thermal stability and mechanical properties decline, colorless and transparent polyimide film fog In order to achieve the effect of low birefringence

Inactive Publication Date: 2020-04-21
合肥中汇睿能能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, due to the excessive retention of flexible alicyclic chain links, the thermal stability and mechanical properties of polyimide have a certain decline.
On the other hand, in the prior art, inorganic nanoparticles such as titanium oxide, zirconium oxide, silicon oxide, aluminum oxide, and calcium carbonate are generally introduced into the polyimide matrix for corresponding modification, but for colorless and transparent polyimide films In general, although the introduction of inorganic fillers improves the performance of the conventional yellow polyimide film, it will increase the haze, yellowing index, birefringence and other properties of the colorless and transparent polyimide film.

Method used

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  • Modified polyimide film and preparation method thereof
  • Modified polyimide film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Preparation of polyamic acid resin solution

[0054] In a nitrogen atmosphere, the temperature of the synthesis system is controlled at 15°C, and 0.628 kg of aromatic diamine 2,2'-bis(trifluoromethyl)- 4,4'-diaminobiphenyl (2,2'-TFDB) was stirred and dissolved. After 2,2'-TFDB was completely dissolved, 0.872 kg aromatic dianhydride 2,2-bis(3,4-dicarboxylic acid phenyl)hexafluoropropane dianhydride (6FDA), and stirred at 1500r / min, synthesized by polycondensation reaction for 24h to obtain solid content M=1.50kg, That is, a polyamic acid resin solution with a solid content ratio of 5 wt %;

[0055] (2) Preparation of colorless transparent gel slurry

[0056] Under the condition of controlling the temperature of the system at 20°C, add the flax fiber to the ionic liquid of N-alkyl-N-methylpyrrolidine bis(trifluoromethanesulfonyl)imide salt, and perform low-speed shear stirring at 100r / min for 2h, 800r / min high-speed shear stirring pretreatment for 5.5 hours, 28khz...

Embodiment 2

[0062] The difference between this example and Example 1 is that "the amount of flax fiber added is 0.3wt% of the solid content M in the polyamic acid resin solution described in step (1)".

Embodiment 3

[0064] The difference between this example and Example 1 is that "the amount of flax fiber added is 2.8wt% of the solid content M in the polyamic acid resin solution described in step (1)".

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Abstract

The invention discloses a preparation method of a modified polyimide film. The preparation method comprises the following steps: adding flax fibers and/or paper fibers into an ionic liquid at room temperature, carrying out stirring until a solution forms colorless transparent gel, and conducting filtering to obtain the colorless transparent gel; adding the prepared colorless transparent gel into aresin solution, and conducting stirring to obtain a modified resin solution, wherein the mass of the added flax fibers and/or paper fibers is 0.1 wt%-4.8 wt% of the solid content in the resin solution, and the resin solution is a polyamide acid resin solution and/or a polyimide resin solution; and subjecting the modified resin solution to molding and biaxially stretching to obtain the modified polyimide film. The invention also discloses the modified polyimide film. Colorless transparent micro-nano flax and/or paper fiber modified by ionic liquid partial dissolution and surface homogeneous derivatization reaction is added into the resin solution, so the mechanical property, the optical property and the moisture absorption property of the colorless transparent polyimide film are effectively improved.

Description

technical field [0001] The invention relates to the technical field of functional polyimide films, in particular to a modified polyimide film and a preparation method thereof. Background technique [0002] In the future, the development of optoelectronic devices will gradually show the trend of light weight, large size, ultra-thin and flexible. As a traditional transparent substrate material, glass can no longer meet the development requirements of future flexible packaging technology. With the advantages of transparency, flexibility, light weight, and high impact resistance, it has become the first choice for flexible optoelectronic packaging substrate materials in the future. Polyimide (PI) film has excellent heat resistance and stability, which can meet the requirements of high-temperature processes such as electrode film deposition and annealing treatment in the process of optoelectronic device processing. Therefore, the development of high-transparency PI materials has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08L1/02C08J5/18C08J5/06
CPCC08J5/06C08J5/18C08J2379/08C08J2401/02
Inventor 王文静王海生
Owner 合肥中汇睿能能源科技有限公司
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