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No-yellowing easily-reworked UV mercury lamp curing EVA optical adhesive film and preparation method thereof

An optical glue, no yellowing technology, applied in the direction of adhesives, etc., can solve the problems of rising yellowness value, difficult rework, affecting the stability of electronic products, etc., to achieve good long-term yellowing resistance, easy to rework, to solve problems and parts. Effects of damage problems

Inactive Publication Date: 2018-06-15
GUANGZHOU LUSHAN NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The research results show that if the downstream customers are in the quality inspection process, it will be difficult to rework the pre-laminated electronic products that take a little longer (the general quality inspection uses a strong light), and at the same time, the products cured by ultraviolet light will also be difficult after long-term aging. There is a problem of rising yellowness value, which will undoubtedly affect the long-term use stability of electronic products

Method used

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  • No-yellowing easily-reworked UV mercury lamp curing EVA optical adhesive film and preparation method thereof
  • No-yellowing easily-reworked UV mercury lamp curing EVA optical adhesive film and preparation method thereof
  • No-yellowing easily-reworked UV mercury lamp curing EVA optical adhesive film and preparation method thereof

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Effect test

preparation example Construction

[0035] The present invention also provides a preparation method of the UV curable EVA optical adhesive film, which comprises the following steps:

[0036] Pre-mixing step: put ethylene-vinyl acetate copolymer, acrylate monomer, photoinitiator, light stabilizer, antioxidant, coupling agent, and slippery agent into a cone with a wall temperature of 40°C according to the above formula Premixing in a mixer until all the additives are absorbed to obtain a premix;

[0037] Forming steps: Then put the premixed material into the hopper of the tape casting machine, melt it at 80-110°C, and go through the processes of plasticizing, extruding, stretching, pulling, and winding to obtain an EVA optical film.

[0038] The step of curing and cross-linking: after the EVA optical film is laminated and pre-pressed by a vacuum press at 60-80° C., it is irradiated with 2500 mj under a high-pressure mercury lamp with a light intensity of 3 kw to complete the curing and cross-linking.

[0039] The...

Embodiment 1

[0042] UV mercury light curing EVA optical adhesive film, thickness 0.15mm, its raw materials are: 100 parts of EVA, 6 parts of acrylate monomer, 0.6 parts of photoinitiator, 0.05 part of light stabilizer, 0.1 part of antioxidant, 0.5 part of even Joint agent, 0.1 parts of slip agent; wherein EVA is composed of vinyl acetate content 26%, melting point 72 ℃, acrylate monomer is composed of isobornyl acrylate and triallyl isocyanurate according to the quality of 2:1 Ratio composition, photoinitiator 1173 (2-hydroxy-2-methyl-1-phenylacetone), antioxidant 264, coupling agent by γ-(methacryloyloxy) propyltrimethoxysilane The composition is mixed evenly by a mixer, put into a casting machine, and plasticized, extruded, stretched, drawn, and wound at 110°C to make a film with a thickness of about 0.15mm.

Embodiment 2

[0044] UV mercury light curing EVA optical adhesive film, thickness 0.2mm, its raw materials are: 100 parts of EVA, 8 parts of acrylate monomer, 1 part of photoinitiator, 0.05 part of light stabilizer, 0.1 part of antioxidant, 0.3 part of dual Joint agent, 0.05 parts of slip agent; wherein EVA is composed of vinyl acetate content of 28% and melting point of 70°C, and acrylate monomer is composed of isobornyl acrylate and triallyl isocyanurate according to the quality of 3:1 Ratio composition, photoinitiator 1173 (2-hydroxy-2-methyl-1-phenylacetone), antioxidant 264, coupling agent by γ-(methacryloyloxy) propyltrimethoxysilane The composition is mixed evenly by a mixer, put into a casting machine, and plasticized, extruded, stretched, drawn, and wound at 100°C to make a film with a thickness of about 0.2mm.

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Abstract

The invention discloses a no-yellowing easily-reworked UV mercury lamp curing EVA optical adhesive film and a preparation method thereof. The EVA optical adhesive film is prepared from the following raw materials in parts by weight: 100 parts of ethylene-vinyl acetate copolymer, 3-15 parts of an acrylate monomer, 0.3-2 parts of a photoinitiator, 0.02-0.1 part of a slipping agent, 0.05-0.5 part ofa light stabilizer, 0.05-0.5 part of an antioxidant, and 0-1 part of a coupling agent. The invention also includes a preparation method of the functional adhesive film. According to the method provided by the invention, the prepared UV mercury lamp curing adhesive film has the advantages of no yellowing and easy repairing, and has good adhesive performance and excellent aging resistance; and the working process is simple, the processing is convenient, the film can be repaired on line, the reject ratio is greatly reduced, and the production efficiency is high.

Description

technical field [0001] The present invention relates to an EVA optical film technology, in particular to a non-yellowing, easy-to-rework UV mercury lamp-cured EVA optical film and a preparation method thereof, which is applied to the lamination of touch screens or liquid crystal displays and belongs to the packaging of electronic products field. Background technique [0002] Traditional optical packaging materials such as OCA and LOCA have good application effects and a relatively mature market, but there are problems such as difficult rework and difficult handling of glue overflow, which is not conducive to the lamination of medium and large-sized touch screens and LCD modules. [0003] In recent years, new optical film packaging materials have also been continuously developed in recent years, such as the UV-curable elastomer film mentioned in the patent CN 103525319A, such as the polyolefin UV-curable film mentioned in the patent 201410609318.x, all of which are hot-melt ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08J5/18C08F220/18C08F255/02C08F226/06C09J123/08
CPCC08F255/026C08J5/18C08J2323/08C09J123/0853C08F220/1811
Inventor 王尚文唐舫成汪加胜
Owner GUANGZHOU LUSHAN NEW MATERIALS
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