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Preparation method of colorless transparent polyimide film

A technology of transparent polyimide and polyamic acid, which is applied in the field of thin films, can solve the problems of low transmittance and limitation of visible light, achieve excellent optical transparency, prevent film yellowing, and improve optical performance

Inactive Publication Date: 2017-10-24
ANHUI GUOFENG PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional polyimide film is brownish-yellow, and its visible light (wavelength 400-700nm) light transmittance is low, and the light transmittance at 500nm is less than 40%, and it is absorbed by 100% when it reaches near 400nm, which seriously limits its use in the field. Photoelectric field application

Method used

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  • Preparation method of colorless transparent polyimide film
  • Preparation method of colorless transparent polyimide film
  • Preparation method of colorless transparent polyimide film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this embodiment, the colorless transparent polyimide film material has the following structural formula:

[0029]

[0030] Concrete preparation steps are as follows:

[0031] (1) In a reaction kettle full of nitrogen protection gas, first dissolve 4,4'-diaminodiphenyl ether in DMAc solvent, then add hexafluoroisopropylidene tetraphthalic acid dianhydride, and the molar ratio of feeding is 1:1, polycondensation reaction with mechanical stirring at 25°C to obtain a polyamic acid solution with a rotational viscosity of 150,000mPa·s (25°C, Type B) and a solid content of 20%.

[0032] (2) At -15°C, add acetic anhydride (2 times the equivalent of aromatic diamine) and isoquinoline (1.5 times the equivalent of aromatic diamine) to the above polyamic acid solution, and stir thoroughly Dispersed, followed by defoaming treatment.

[0033] (3) The defoamed solution was cast onto a glass support, heated to 120° C. at a heating rate of 5° C. / min, and the imidization reaction...

Embodiment 2

[0035] In this embodiment, the colorless transparent polyimide film material has the following structural formula:

[0036]

[0037] Concrete preparation steps are as follows:

[0038] (1) In a reactor filled with nitrogen protection gas, first dissolve 1,4-bis(4-amino-2-trifluoromethylphenoxy)benzene in NMP solvent, then add hexafluoroisopropylidene Pyellitic dianhydride, the molar ratio of feed is 1:1, and the polycondensation reaction is mechanically stirred at 25°C to obtain a polyamic acid solution with a rotational viscosity of 125000mPa·s (25°C, Type B) and a solid content of 18%.

[0039] (2) At -10°C, add acetic anhydride (3 times the equivalent of aromatic diamine) and isoquinoline (1.5 times the equivalent of aromatic diamine) to the above polyamic acid solution, and stir thoroughly Dispersed, followed by defoaming treatment.

[0040] (3) The defoamed solution was cast onto a glass support, and heated to 130° C. at a heating rate of 5° C. / min to fully volatiliz...

Embodiment 3

[0042] In this embodiment, the colorless transparent polyimide film material has the following structural formula:

[0043]

[0044] Concrete preparation steps are as follows:

[0045] (1) In a reactor filled with nitrogen protection gas, first dissolve 4,4'-diamino-2,2'-bistrifluoromethylbiphenyl in DMAc solvent, then add hexafluoroisopropylidene Tetraacid dianhydride, the feeding molar ratio is 1:1, the polyamic acid solution is obtained with mechanical stirring at 25°C for 6h, and the rotational viscosity is 100000mPa·s (25°C, type B), and the solid content is 15%.

[0046] (2) At -10°C, add acetic anhydride (the amount is 2.5 times the equivalent of the aromatic diamine) and isoquinoline (the amount is 2 times the equivalent of the aromatic diamine) to the above polyamic acid solution, and stir thoroughly Dispersed, followed by defoaming treatment.

[0047] (3) The defoamed solution was cast onto a glass support, and heated to 120° C. at a heating rate of 10° C. / min t...

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Abstract

The present invention discloses a preparation method of a colorless transparent polyimide film. The preparation method comprises: under the protection of nitrogen gas, adding an aromatic dianhydride and an aromatic diamine in a polar aprotic solvent according to a molar ratio of 1:1, and carrying out a condensation polymerization reaction to obtain a polyamic acid solution; cooling to a temperature of -30 to -10 DEG C, adding an imidization reagent to the polyamic acid solution, carrying out stirring mixing, and carrying out defoaming treatment; and casting the defoamed solution onto a support body, drying, and carrying out imidization to obtain the polyimide film. According to the present invention, by introducing the fluorine element, the sulfone group or the ether bond in the main chain of the polyimide, the co-planarity of the molecular structure can be destroyed, and the light transmittance of the film can be improved; and with the chemical imidization method, the energy consumption can be reduced while the optical property of the film can be improved.

Description

technical field [0001] The invention relates to the technical field of films, in particular to a preparation method of a colorless and transparent polyimide film. Background technique [0002] Polyimide is a kind of rigid chain polymer with a highly regular chemical structure containing imide rings on the main chain of the polymer. The special imide ring structure makes it have excellent thermal stability, mechanical, dielectric, mechanical, Radiation resistance and solvent resistance are widely used in the automotive industry, aerospace high-temperature parts and printed circuit materials. [0003] The development of optoelectronic devices is gradually showing 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 flexible packaging technology; high transparency polymer materials due to their transparent, With the advantages of flexibility, light weight, and h...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08J5/18C08L79/08
CPCC08G73/1071C08G73/1039C08G73/1064C08J5/18C08J2379/08
Inventor 杨露陈铸红孙善卫吴天华
Owner ANHUI GUOFENG PLASTIC
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