UV crosslinking and curing acrylic ester-modified EVA optical adhesive film and preparation method thereof

An acrylate, cross-linking and curing technology, applied in adhesives, film/sheet adhesives, non-polymer organic compound adhesives, etc., can solve the problem of no obvious improvement in water vapor barrier properties, thermal stability and weather resistance Insufficient thermal stability, easy thermal expansion and contraction, etc., to achieve excellent light transmission, reduce lamination failure rate and production cost, and strong shock and explosion resistance

Inactive Publication Date: 2016-11-23
SHENZHEN GAOREN ELECTRONICS NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This EVA base material can fully meet the performance requirements of the touch screen in terms of optics and adhesiveness, but it is easy to expand and contract with heat and contract in terms of thermal stability, and has poor weather resistance such as poor water vapor barrier properties. With the rapid development of touch screens, The requirements for the overall performance of touch screens are also getting higher and higher, especially in vehicle touch screens, outdoor display screens, large-size touch screens, etc., which put forward higher requirements for the mechanical properties and weather resistance of laminated optical materials
[0004] It is a direction to modify the EVA substrate to improve its mechanical properties and weather resistance. It is also mentioned in the patent CN103525319A that EVA can be grafted with maleic anhydride or glycidyl methacrylate, but such grafts, Its thermal stability and weather resistance are not strong. In practical application, its modified EVA has no obvious improvement in thermal stability and weather resistance, especially in water vapor barrier properties, even worse than OCA and LOCA. , which greatly restricts the application of EVA optical adhesive film in touch screen lamination

Method used

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  • UV crosslinking and curing acrylic ester-modified EVA optical adhesive film and preparation method thereof
  • UV crosslinking and curing acrylic ester-modified EVA optical adhesive film and preparation method thereof
  • UV crosslinking and curing acrylic ester-modified EVA optical adhesive film and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] According to the proportion of parts by weight, 93 parts of EVA with 28% VA content and MI of 5 and 7 parts of trimethylolpropane trimethacrylate, a multifunctional acrylate reactive monomer, are immersed in a heatable sealed mixing device until complete Absorb and dry and mix uniformly to obtain a mixture; add 0.5 parts of free radical photoinitiator 1-hydroxycyclohexyl phenyl ketone, light stabilizer succinic acid and 4-hydroxy-2,2,6,6-tetramethyl 0.2 part of polymer of 1-piperidinol, 0.1 part of antioxidant diphenylisodecyl phosphite, β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid n-octadecyl 0.1 part of carbon alcohol ester, 2.5 parts of coupling agent 3-methacryloxypropyltrimethoxysilane, and mix them uniformly to obtain a mixture. Put the mixture into the casting machine at an extrusion temperature of 100°C. After casting, cooling, pulling, and winding, at the same time, a layer of PE and PET protective film is attached to the front and back of the extrudate i...

Embodiment 2

[0031] Place 86 parts of EVA with 33% VA content and MI of 1 and 14 parts of trimethylolpropane trimethacrylate, a multifunctional acrylate reactive monomer, in a heatable sealed mixing device according to parts by weight. Absorb dry and mix uniformly to obtain a mixture; add 1 part of free radical photoinitiator 1-hydroxycyclohexyl phenyl ketone, light stabilizer succinic acid and 4-hydroxy-2,2,6,6-tetramethyl 0.3 parts of polymer of 1-piperidinol, 0.15 parts of antioxidant diphenylisodecyl phosphite, β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid n-octadecyl Carbon alcohol ester 0.15 parts, coupling agent 3-methacryloxypropyl trimethoxysilane 3 parts, and mixed uniformly to obtain a mixture, put the mixture into the casting machine, the extrusion temperature is 100 ℃, the extrudate After casting, cooling, pulling, and winding, at the same time, a layer of PE and PET protective film is attached to the front and back of the extrudate in the casting section. After casting, ...

Embodiment 3

[0033] According to the proportion of parts by weight, 72 parts of EVA with 41% VA content and MI of 2 and 28 parts of trimethylolpropane trimethacrylate, a multifunctional acrylate reactive monomer, are immersed in a heatable sealed mixing device until complete Absorb and dry and mix uniformly to obtain a mixture; add 2 parts of free radical photoinitiator 1-hydroxycyclohexyl phenyl ketone, light stabilizer succinic acid and 4-hydroxy-2,2,6,6-tetramethyl 0.4 parts of polymer of 1-piperidinol, 0.2 parts of antioxidant diphenyl isodecyl phosphite, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-octadecyl Carbon alcohol ester 0.2 parts, coupling agent 3-methacryloxypropyl trimethoxysilane 6 parts, and mixed uniformly to obtain the mixture, put the mixture into the casting machine, the extrusion temperature is 100 ℃, the extrudate After casting, cooling, pulling, and winding, at the same time, a layer of PE and PET protective film is attached to the front and back of the ex...

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Abstract

The invention provides a UV crosslinking and curing acrylate modified 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: 50-93 parts of ethylene-vinyl acetate copolymer, 7-50 parts of multifunctional acrylate reactive monomer, 0.5-3 parts of free radical photoinitiator, photostable 0.1-0.5 part of anti-oxidant, 0.1-0.5 part of antioxidant, 2.5-10 part of coupling agent. The EVA optical adhesive film not only has the characteristics of simple lamination process, can be reworked, improves production efficiency, reduces defective rate and production cost, but also has excellent mechanical properties, water vapor barrier properties, heat resistance and stability, and other weather resistance.

Description

Technical field [0001] The invention relates to an optical adhesive film and a preparation method thereof, in particular to a UV cross-linked curing acrylate modified EVA optical adhesive film applied to a touch screen and a liquid crystal display panel bonding and a preparation method thereof. Background technique [0002] In recent years, the electronics industry has developed rapidly, and touch screens and LCD screens have become more and more widely used. At present, the raw materials for bonding mainly include OCA and LOCA optical adhesives. OCA optical adhesive is a double-sided laminating tape without matrix material. It is the best adhesive for the bonding of touch screens and LCD panels. However, it is difficult to fit and requires high precision. It cannot be laminated by hand, especially for larger ones. Touch screens and LCD screens of a large size (for example, 7 inches or more) are very difficult to fit together, are prone to bubbles, and cannot be reworked. LOCA i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/00C09J4/02C09J4/06C09J11/06
CPCC09J7/00C09J4/06C09J11/06C09J2203/318
Inventor 陆志胆孙仕兵顾孔胜
Owner SHENZHEN GAOREN ELECTRONICS NEW MATERIAL
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