Ultraviolet-irradiation-resistant colorless transparent polyimide film and preparation method and application thereof

A transparent polyimide, UV-resistant technology, applied in the field of functional polyimide, can solve the problems of CPI film anti-UV application, inability to adapt to application requirements, damage to film optical properties, etc., to achieve excellent anti-UV radiation Illumination characteristics, excellent UV radiation resistance, good UV stability

Pending Publication Date: 2020-09-22
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal stability of conventional UV stabilizers is poor, and cannot meet the application requirements of the high-temperature treatment (≥280°C) process in the CPI film preparation process
Therefore, it cannot be used in the anti-UV application of CPI film
And other high-temperature resistant anti-UV stabilizers often have darker colors, and adding them to the CPI film matrix often destroys the optical properties of the film.

Method used

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  • Ultraviolet-irradiation-resistant colorless transparent polyimide film and preparation method and application thereof
  • Ultraviolet-irradiation-resistant colorless transparent polyimide film and preparation method and application thereof
  • Ultraviolet-irradiation-resistant colorless transparent polyimide film and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1 prepares PI (HPMDA-ODA) film (UV stabilizer content: 0) by HPMDA and ODA

[0045] Add 20.0240 g (0.1 mol) of ODA and 150 g of NMP into a 500 mL three-neck flask equipped with a heating mantle, mechanical stirring, thermometer, water separator, and reflux condenser. Nitrogen gas was introduced and a clear solution was obtained after mechanical stirring for 20 min. 22.4170 g (0.1 mol) HPMDA was added under stirring, and the viscosity of the system gradually increased. Add 20 g of NMP and stir at room temperature for 30 min to obtain a viscous solution. Add 0.5g pyridine and 150mL toluene as catalyst and azeotropic dehydrating agent respectively. When the system temperature rises to 130-140°C, the toluene / water azeotrope evaporates out of the water separator. Keep reflux for dehydration until no water drops come out of the system. Continue to heat up to 180°C and keep the temperature for 3h. Stop heating and cool to room temperature naturally. The obtain...

Embodiment 2

[0051] Embodiment 2 Cooperate UV stabilizer (formula II) by PI (HPMDA-ODA) and prepare UV-resistant type colorless transparent polyimide film (the quality of UV stabilizer accounts for 0.5% of the total mass of PI film, mass ratio)

[0052] The preparation process of PI resin is as in Example 1.

[0053] 7.5 g of the above resin was dissolved in 40 g of DMAc to obtain a PI solution (solution A). At the same time, 0.039475 g of the UV stabilizer represented by formula II was dissolved in 2.857 g of DMAc to obtain a UV stabilizer solution (solution B). Pour solution B into solution A to prepare a 15wt% PI composite solution. After the solution is mixed evenly, it is evenly coated on the surface of a clean glass plate by an automatic film coating machine, placed in a 100-class clean program temperature-controlled drying oven, and cured according to the following program: 50°C / 0.5h; 80°C / 3h; 120°C / 1h; 150°C / 1h; 180°C / 1h; 200°C / 1h; 250°C / 1h. Naturally cool to room temperature. ...

Embodiment 3

[0058] Embodiment 3 Cooperate UV stabilizer (formula III) by PI (HPMDA-ODA) and prepare UV-resistant type colorless transparent polyimide film (the quality of UV stabilizer accounts for 0.5% of the total mass of PI film, mass ratio)

[0059] The preparation process of PI resin is as in Example 1.

[0060] 7.5 g of the above resin was dissolved in 40 g of DMAc to obtain a PI solution (solution A). At the same time, 0.039475 g of the UV stabilizer represented by formula III was dissolved in 2.857 g of DMAc to obtain a UV stabilizer solution (solution B). Pour solution B into solution A to prepare a 15wt% PI composite solution. After the solution is mixed evenly, it is evenly coated on the surface of a clean glass plate by an automatic film coating machine, placed in a 100-class clean program temperature-controlled drying oven, and cured according to the following program: 50°C / 0.5h; 80°C / 3h; 120°C / 1h; 150°C / 1h; 180°C / 1h; 200°C / 1h; 250°C / 1h. Naturally cool to room temperature...

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Abstract

The invention provides an ultraviolet-irradiation-resistant colorless transparent polyimide film and a preparation method and application thereof. The ultraviolet-irradiation-resistant colorless transparent polyimide film is prepared by compounding PI matrix resin shown as a formula I and a hindered amine UV stabilizer, and the number-average molecular weight of the hindered amine UV stabilizer isnot lower than 1000 g/mol. The composite film prepared by fully mixing the PI matrix resin with the UV stabilizer in a proper proportion has excellent heat-resistant stability, high glass transitiontemperature (Tg), high transparency and excellent UV irradiation resistance. The UV-irradiation-resistant colorless transparent polyimide film can be used as a flexible material to be applied to the high-tech fields of solar cells, flexible printed circuit boards, microelectronics, automobiles and the like.

Description

technical field [0001] The invention relates to the field of functional polyimide, more specifically, to a colorless and transparent polyimide film resistant to ultraviolet radiation and its preparation method and application. Background technique [0002] Standard wholly aromatic polyimide (PI) films are often referred to as "golden films" primarily due to their golden-yellow appearance. The main reason for this color is that in the molecular structure of fully aromatic PI, the charge will be directly transferred between the diamine unit as the electron donor and the dianhydride unit as the electron acceptor. In this charge transfer (CT) process Significant absorption of visible light occurs in the PI film, which makes the PI film appear darker. This CT effect can occur not only inside the molecular chain, but also between the molecular chains. The darker color limits the application of standard fully aromatic PI films in advanced optoelectronics. In order to obtain a co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08L79/04C08K5/3435C08L67/02C08J5/18C08G73/10
CPCC08G73/105C08G73/1078C08J5/18C08J2379/08C08J2467/02C08J2479/04C08K5/3435
Inventor 刘金刚魏鑫莹职欣心张燕吴琳祁浩然
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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