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UV cured EVA optical film and preparation method thereof

An optical film and photoinitiator technology, applied in the directions of non-polymer organic compound adhesives, non-polymer adhesive additives, adhesive additives, etc. Produce acetic acid and other problems to achieve the effect of reducing blue light damage to eyes, avoiding bubbles, and reducing eye damage

Inactive Publication Date: 2018-05-15
GUANGDONG POLYTECHNIC OF ENVIRONMENTAL PROTECTION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, during the use of the electronic screen bonded to the EVA optical film made of a single EVA substrate, water vapor penetrates from the side of the electronic screen, resulting in a decrease in the adhesion of the EVA optical film and the appearance of bubbles. The water vapor will cause the hydrolysis of EVA to produce acetic acid

Method used

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  • UV cured EVA optical film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 1.2 parts to 70 parts by weight of ethylene-vinyl acetate copolymer with a VA content of 33% and a melting point of 70°C and 30 parts by weight of an ethylene-methyl methacrylate copolymer with a MMA content of 24% and a melting point of 80°C Photoinitiator 4,4'-bis(diethylamino)benzophenone, 0.5 part of crosslinking agent triallyl cyanurate, 1.0 part of tackifier γ-methacryloxypropyl trimethoxy 2-[[1-[[(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)amino]carbonyl]-2-oxopropyl Dimethyl ]azo]-1,4-phthalate, 0.6 part light stabilizer bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, 0.1 part plasticizer Agent diisooctyl phthalate, 0.4 parts of antioxidant β-(3,5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate, added to the high-speed mixer for premixed to obtain a premix. The obtained premix is ​​put into the hopper of the single-screw casting machine, melted and plasticized at 100°C, and the film thickness of the middle layer is obtained through extrusion, upper and ...

Embodiment 2

[0028] Add 2.0 parts by weight to 90 parts by weight of ethylene-vinyl acetate copolymer with a VA content of 33% and a melting point of 70°C and 10 parts by weight of an ethylene-methyl methacrylate copolymer with a MMA content of 24% and a melting point of 80°C Photoinitiator acrylated benzophenone, 0.3 parts of crosslinking agent trimethylolpropane trimethacrylate, 1.2 parts of tackifier vinyltrimethoxysilane, 0.1 part of blue light absorber 2-(2-cyano Base-4-nitrophenylazo)-6-isopropylphenol, 0.4 parts of light stabilizer N,N,-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1 , 6-hexamethylenediamine, 0.9 parts of plasticizer cresyl diphenyl phosphate, 0.3 parts of antioxidant bis(3,5-tertiary butyl-4-hydroxyphenyl) sulfide, added to the high-speed mixer Premixing is carried out to obtain a premix. The obtained premix is ​​put into the hopper of the single-screw casting machine, melted and plasticized at 100°C, and the film thickness of the middle layer is obtained through extrusi...

Embodiment 3

[0030]Add 1.5 parts by weight to 80 parts by weight of ethylene-vinyl acetate copolymer with VA content of 33% and melting point of 70°C and 20 parts by weight of ethylene-methyl methacrylate copolymer with MMA content of 24% and melting point of 80°C Photoinitiator 4,4'-bis(diethylamino)benzophenone, 1.0 parts of crosslinking agent ethylene glycol dimethacrylate, 0.3 parts of tackifier γ-glycidyl ether propyl trimethoxysilane, 0.6 part of blue light absorber 2,4-dihydro-5-methyl-2-phenyl-4-phenylazo-3H-pyrazolin-3-one, 0.1 part of light stabilizer bis(2,2, 6,6-tetramethyl-4-piperidinyl) sebacate, 1.1 parts of plasticizer di-isooctyl phthalate, 1.0 parts of antioxidant tetrakis[β-(3,5-di-tert-butyl Base-4-hydroxyphenyl) propionate] pentaerythritol ester, added to a high-speed mixer for pre-mixing to obtain a pre-mixture. The obtained premix is ​​put into the hopper of the single-screw casting machine, melted and plasticized at 100°C, and the film thickness of the middle layer...

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Abstract

The invention discloses an UV cured EVA optical film and a preparation method of the UV cured EVA optical film. The UV cured EVA optical film comprises the following components in parts by weight: 70to 90 parts of an EVA copolymer, 10 to 30 parts of an EMMA copolymer, 0.5 to 2.0 parts of a photoinitiator, 0.3 to 1.5 part of a crosslinker, 0.3 to 1.2 parts of a thickener, 0.1 to 0.8 part of a bluelight absorber, 0.1 to 1.1 parts of a plasticizer, 0.2 to 1.0 part of an antioxidant and 0.1 to 0.6 part of a light stabilizer through premixing and tape casting. The UV cured EVA optical film prepared by the invention can absorb blue lights with relatively high energy at the wavelength ranging from 400 nm to 480 nm, and reduce the damage of the blue light emitted by an electronic screen to eyes,and further has excellent water vapor barrier properties. When being used, the EVA optical film is cured and crosslinked by UV to meet bonding requirements among an electronic screen protection layer, a touch layer, and a display layer.

Description

technical field [0001] The invention relates to the field of optical films of electronic components, in particular to a UV-curable EVA optical film capable of absorbing blue light and having good water resistance and a preparation method thereof. Background technique [0002] With the rapid development of electronic technology, in today's era of rapid technological development, mobile phones, tablet computers, notebooks, computers, TVs, publicity and advertising display screens can be seen everywhere, and people's lives are inseparable from these electronic products. These electronic products, while providing information to people through the display screen, also emit blue light with a wavelength between 400-480nm. Blue light within this wavelength will increase the amount of toxins in the macular area of ​​the eye, seriously threatening our eye health. Traditional electronic screen bonding materials include OCA optical glue and LOCA optical glue, but both of these two opti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J4/06C09J4/02C09J4/00C09J11/06
CPCC09J4/00C09J4/06C09J11/06
Inventor 严迎燕吴建东张艳林
Owner GUANGDONG POLYTECHNIC OF ENVIRONMENTAL PROTECTION ENG
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