CN109765647A - A kind of transparent polyimide film - Google Patents
A kind of transparent polyimide film Download PDFInfo
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- CN109765647A CN109765647A CN201811620933.5A CN201811620933A CN109765647A CN 109765647 A CN109765647 A CN 109765647A CN 201811620933 A CN201811620933 A CN 201811620933A CN 109765647 A CN109765647 A CN 109765647A
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- hardened layer
- polyimide film
- transparent polyimide
- optical surface
- transparent
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Abstract
The invention discloses a kind of transparent polyimide films, comprising: a non-transparent flexible substrate with the first optical surface and the second optical surface, first optical surface side is equipped with the first hardened layer, the side of second optical surface is equipped with the second hardened layer, the thickness range of first hardened layer is 5-15 μm, the thickness range of second hardened layer is 0.1-10 μm, and the shrinking percentage of second hardened layer is 1-15%.Inhibit the forward and reverse warpage of transparent polyimide film by the shrinking percentage of the thickness and the second hardened layer of control first hardened layer and the second hardened layer.
Description
Technical field
The present invention relates to optical films, and in particular to transparent polyimide film.
Background technique
In recent years, with the development of mobile device such as smart phone and tablet computer, need to be used in the substrate of display
Thinned and loss of weight.Glass or tempered glass are often used as having on the window or foreboard of the display for mobile device excellent
The material of mechanical property.However, glass is rushed since the weight of its own causes the weight of mobile device to increase, and due to external
It hits and there is a problem of breakage.
Therefore, substitute of the plastic resin as glass is being studied.Plastic resin composition is lightweight, but does not almost have
There is the risk of cracking, to be suitable for pursuing the trend of lighter mobile device.Particularly, in order to obtain with high rigidity and wear-resisting
The composition of characteristic, it has been proposed that for coating the composition of hard conating in support substrate.
Method as the surface hardness for improving hard conating, it may be considered that increase the method for the thickness of hard conating.In order to true
The surface hardness being enough instead of glass is protected, needs to realize certain thickness hard conating.However, the thickness with hard conating increases,
Surface hardness can increase, but increase the generation of fold and curling due to the cure shrinkage of hard conating, be easy to happen simultaneously
The cracking of coating and removing.Therefore, the practical application of this method is not easy to.
Meanwhile for the reason of the beautiful and function, wherein a part bending of display device or the flexible display distorted
Recently concern is caused, and this trend is particularly significant in mobile device such as smart phone and tablet computer.However, due to
Glass is not suitable for use in protecting the cover plate of such flexible display, it is therefore desirable to replace glass with plastic resin etc..However,
For this purpose, there is the film of the sufficient flexible high rigidity for showing glass horizontal simultaneously to be not easy to for production.
Summary of the invention
A kind of transparent polyimide film 100 comprising: a transparent flexible base with the first optical surface and the second optical surface
Bottom 2, first optical surface side are equipped with the first hardened layer 1, and the side of second optical surface is equipped with the second hardened layer 3, institute
The thickness range for stating the first hardened layer 1 is 5-15 μm, and the thickness range of the second hardened layer 3 is 0.1-10 μm, second hardening
The shrinking percentage of layer 3 is 1-15%.Certain thickness first hardened layer 1, which is arranged, in the first optical surface can make clear polyimides
Film 100 improves the hardness and wearability on its surface when using as flexible cover plate, but when thickness of its setting is more than certain value, should
Transparent polyimide film 100 is also easy to produce warpage, influences the appearance and use of product, therefore is coated in the second optical surface of substrate
Second hardened layer 3 of certain thickness and certain shrinking percentage, by reversely suppressing warpage, transparent polyimide film 100 passes through control
First hardened layer 1, the thickness of second hardened layer 3 and 3 shrinking percentage of the second hardened layer are meeting wearability and hard
Degree controls the cost-effective forward and reverse warpage for adjusting transparent polyimide film 100 simultaneously in the case where requiring.
Further, the material of first hardened layer 1 and/or second hardened layer 3 is selected from acrylic glue.
Further, the ranges of indices of refraction of first hardened layer 1 is 1.48-1.53；The folding of second hardened layer 3
Penetrating rate range is 1.48-1.53.
Further, the absolute difference range of the refractive index of first hardened layer 1 and non-transparent flexible substrate 2 is 0.05-
Between 0.3, to further increase anti-reflective and the shadow effect that disappears.First hardened layer 1 and the second hardened layer 3 are selected from above-mentioned refractive index
Range, the purpose is to the carry out index matchings with non-transparent flexible substrate 2, to reduce transparent polyimide film on the whole
100 reflectivity.
Further, the non-transparent flexible substrate 2 is selected from: equal benzene-type PI (polyimides), soluble PI, polyamide-acyl
At least one of imines PAI and polyimide PEI, the purpose selected from above-mentioned clear polyimides are above-mentioned clear polyimides
Can -269 DEG C long-term -280 DEG C indeformable, excellent insulation performances, good flame resistance.
Further, the composition of the acrylic glue includes:
Further, the acrylic monomers is selected from: double pentaerythritol methacrylate, tripropylene glycol acrylic acid
Ester, one of 1,6- glycol diacrylate or a variety of.
Further, it is 5-20%, two contractings that the double pentaerythritol methacrylate, which accounts for acrylic monomers total content ratio,
It is 1-10% that tripropylene glycol acrylate, which accounts for acrylic monomers total content ratio, and 1,6- glycol diacrylate accounts for acrylic acid list
Body total content ratio is 1-10%.
Further, the non-transparent flexible substrate 2 includes with flowering structure:
G in formula indicates that 4 valence organic groups, A indicate divalent organic group.
Further, the organic group is selected from: the organic group is selected from: non-ring type aliphatic group, ring type fat
At least one of race's group and aromatic group group.
Further, the aromatic group is selected from: monocyclic aromatic group, fused polycyclic aromatic group, with
And non-condensed made of there is 2 or more aromatic rings and the aromatic ring to be connected to each other directly or through linking group is more
At least one of ring type aromatic group.
Further, the ring type aliphatic group, which is selected from, takes the ring type aliphatic group of 5 generation bases with fluorine system, has fluorine
It is the monocyclic aromatic group of substituent group, the fused polycyclic aromatic group with fluorine system substituent group, there is fluorine system to replace
At least one of non-condensed polycycle aromatic group of base.
Further, the 4 valence organic group is selected from following radicals: saturation or unsaturated ring alkyl, saturation or unsaturation
Heterocyclylalkyl, aryl, heteroaryl, aryl alkyl, alkylaryl, miscellaneous alkyl aryl, have any 2 groups therein and they
At least one of group made of being connected to each other directly or through linking group.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of embodiment.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to invention into
Row is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit
The fixed present invention.
Unless stated otherwise, solvent, reagent, coating method, technical parameter, the coating apparatus etc. that the present invention uses are this
Technical field Conventional solvents, reagent, method, parameter, equipment etc..
Embodiment 1
By the first hardening bath, (the transparent base layer polyamides that Kang get Xin Nei is coated on 80 μm of thickness for model KDX-DC010) is sub-
On first optical surface of amine (South Korea Cologne) 1, formed in the first optical surface with a thickness of 10 μm of first hardened layer 1, in transparent base
Second optical surface of bottom polyimides 1 is coated with the second hardening bath (Kang get Xin Nei for model KDX-DC011), in the second optics
The second hardened layer 3 that surface is formed with a thickness of 5 μm, this technique drying 5 section baking ovens of setting, the temperature setting parameter of baking oven are usually
Start from low to high, the principle finally slightly to cool is generally followed successively by, baking oven first segment: 50 DEG C；The second section of baking oven: 70
℃；Baking oven third section: 90 DEG C；Section four: 110 DEG C of baking oven；Section five: 100 DEG C of baking oven.Dry 2min, about via dosage later
1000mJ/cm2Ultraviolet light, second hardening bath solidify after shrinking percentage be 8%.
The refractive index of above-mentioned first hardened layer is 1.50,
The refractive index of above-mentioned second hardened layer is 1.50,
The refractive index of transparent base layer polyimides (South Korea Cologne) 1 is 1.65,
The refractive index of above-mentioned anti-reflecting layer is 1.35.
Component of the Kang get Xin Nei for model KDX-DC010 are as follows: urethane acrylate content 20%, dipentaerythritol
Six acrylate contents 4%, tripropylene glycol acrylate content 4%, 1,6- glycol diacrylate content 4% are drawn
Send out the mixture content 1% of agent 184 and TPO (819)；The content 1% of levelling agent (BYK-3535).
Component of the Kang get Xin Nei for model KDX-DC011 are as follows: urethane acrylate content 20%, dipentaerythritol
Six acrylate contents 5%, tripropylene glycol acrylate content 5%, 1,6- glycol diacrylate content 6% are drawn
Send out the mixture content 1% of agent 184 and TPO (819)；The content 1% of levelling agent (BYK-3535).
Embodiment 2
Different from the second hardened layer described in embodiment 1, (shrinking percentage after Kang get Xin Nei solidifies for model KDX-DC012) is
15%.
Component of the Kang get Xin Nei for model KDX-DC012 are as follows: urethane acrylate content 15%, dipentaerythritol
Six acrylate contents 5%, tripropylene glycol acrylate content 7%, 1,6- glycol diacrylate content 7%；Draw
Send out the mixture content 1% of agent 184 and TPO (819)；The content 1% of levelling agent (BYK-3535).
Embodiment 3
Different from the second hardened layer described in embodiment 1, (shrinking percentage after Kang get Xin Nei solidifies for model KDX-DC013) is
1%.
Component of the Kang get Xin Nei for model KDX-DC013 are as follows: urethane acrylate content 40%, dipentaerythritol
Six acrylate contents 2%, tripropylene glycol acrylate content 2%, 1,6- glycol diacrylate content 2%；Draw
Send out the mixture content 1% of agent 184 and TPO (819)；The content 1% of levelling agent (BYK-3535).
Embodiment 4
Different from the first hardened layer described in embodiment 1 with a thickness of 5 μm.
Embodiment 5
Different from the second hardened layer described in embodiment 1 with a thickness of 10 μm.
Comparative example 1
Different from embodiment 1, (shrinking percentage after Kang get Xin Nei solidifies for model KDX-DC014) is for second hardened layer
0.5%.
Component of the Kang get Xin Nei for model KDX-DC014 are as follows: urethane acrylate content 60%, dipentaerythritol
Six acrylate contents 2%, tripropylene glycol acrylate content 2%, 1,6- glycol diacrylate content 2%；Draw
Send out the mixture content 1% of agent 184 and TPO (819)；The content 1% of levelling agent (BYK-3535)
Comparative example 2
Different from embodiment 1, (shrinking percentage after Kang get Xin Nei solidifies for model KDX-DC015) is for second hardening bath
20%.
Component of the Kang get Xin Nei for model KDX-DC015 are as follows: urethane acrylate content 10%, dipentaerythritol
Six acrylate contents 5%, tripropylene glycol acrylate content 5%, 1,6- glycol diacrylate content 8%；Draw
Send out the mixture content 1% of agent 184 and TPO (819)；The content 1% of levelling agent (BYK-3535)
Comparative example 3
Different from embodiment 1, first hardened layer with a thickness of 15 μm.
Comparative example 4
Different from embodiment 1, the refractive index 1.62 of first hardened layer 1 and the refractive index 1.65 of non-transparent flexible substrate 2.
Comparative example 5
Different from embodiment 1, first hardened layer with a thickness of 3 μm
Embodiment 1-5 and comparative example 1-5 test result see the table below:
The optical testing instrument that the present invention selects is chromascope NDH2000N；Outer bend test is R5 (radius is 5 μm) 10
Ten thousand times, inner bending tests R3 (radius is 3 μm) 100,000 times；Rub resistance test, wear resistant instrument 1kg/2000 times, reflectivity is in visible light
Wavelength period 380-780nm test.
It should be pointed out that as described above is only to explain the preferred embodiments of the invention, it is right accordingly to be not intended to
The present invention is subject to any form of limitation, all to have any modification or change for making the related present invention under identical spirit
More, the scope that the invention is intended to protect should be all included in.
Claims (7)
1. a kind of transparent polyimide film (100) characterized by comprising one with the first optical surface and the second optical surface
Non-transparent flexible substrate (2), first optical surface side are equipped with the first hardened layer (1), and the side of second optical surface is equipped with
The thickness range of second hardened layer (3), first hardened layer (1) is 5-15 μm, and the thickness range of the second hardened layer (3) is
0.1-10 μm, the shrinking percentage of second hardened layer (3) is 1-15%.
2. transparent polyimide film (100) according to claim 1, which is characterized in that first hardened layer (1) and/
Or the material of second hardened layer (3) is selected from acrylic glue.
3. transparent polyimide film (100) according to claim 1, which is characterized in that the folding of first hardened layer (1)
Penetrating rate range is 1.48-1.53；The ranges of indices of refraction of second hardened layer (3) is 1.48-1.53.
4. transparent polyimide film (100) according to claim 1, which is characterized in that first hardened layer (1) and thoroughly
The absolute difference range of the refractive index of bright flexible substrates (2) is between 0.05-0.3.
5. transparent polyimide film (100) according to claim 1, which is characterized in that non-transparent flexible substrate (2) choosing
From: equal benzene-type PI, soluble PI, at least one of polyamide-imides PAI and polyimide PEI.
6. transparent polyimide film (100) according to claim 2, which is characterized in that the composition packet of the acrylic glue
Contain:
7. transparent polyimide film (100) according to claim 6, which is characterized in that the acrylic monomers is selected from: double
Six acrylate of pentaerythrite, tripropylene glycol and acrylate, one of 1,6- glycol diacrylate or a variety of.
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| CN201811620933.5A CN109765647A (en) | 2018-12-28 | 2018-12-28 | A kind of transparent polyimide film |
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| CN201811620933.5A CN109765647A (en) | 2018-12-28 | 2018-12-28 | A kind of transparent polyimide film |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110935605A (en) * | 2019-11-29 | 2020-03-31 | 湖南中天碧水膜科技有限公司 | Transparent polyimide film |
| CN110993151A (en) * | 2019-11-29 | 2020-04-10 | 湖南中天碧水膜科技有限公司 | Flexible conductive film |
| CN112574604A (en) * | 2019-09-27 | 2021-03-30 | 新恒东薄膜材料（常州）有限公司 | Ultraviolet-damp-heat-aging-resistant pre-coating liquid for transparent PI (polyimide) hardened film and application thereof |
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