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Ultraviolet crosslinking and curing EVA (ethylene vinyl acetate copolymer) optical adhesive film and preparation method thereof

A cross-linking curing, optical adhesive technology, applied in the direction of adhesives, film/sheet adhesives, graft polymer adhesives, etc. It is difficult to fit and other problems, so as to achieve the effect of convenient rework, excellent mechanical properties, and convenient operation and maintenance.

Active Publication Date: 2014-01-22
GUANGZHOU HUICHI GLASS TECHNICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is the best adhesive for touch screens and LCD panels, but OCA optical adhesives are difficult to attach, require high precision, cannot be attached by hand, and are prone to air bubbles, which also have very high requirements for equipment.
Based on OCA optical adhesive, liquid optical adhesive LOCA has been developed. LOCA is a single-component, UV-curable acrylate liquid optical adhesive, which is suitable for bonding touch screens and LCD panels, but this process also exists. Defects, easy glue flow, difficult to remove bubbles, low production efficiency, etc., especially for large-sized touch screens and LCD screens (such as 7 inches or more), it is very difficult to construct, and it is impossible to rework bad components, which greatly improves the electronic quality. Industries such as mobile phones, TVs, medical equipment, LCD screens and touch screens for home appliances reduce production costs and reduce production efficiency

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0038] A preparation method for ultraviolet light crosslinking and curing EVA optical adhesive film, comprising the following steps:

[0039] 1) EVA or a mixture of EVA and its modified graft polymer, a photoinitiator, a multifunctional crosslinking agent, a coupling agent and an adhesive resin are uniformly mixed in a proportion by weight to obtain a mixture;

[0040] 2) Mix the mixture in step 1) uniformly through an extruder and extrude it. The extrusion temperature is 80-150°C. The extruded product is cooled, pulled, and pelletized into granule masterbatches;

[0041] 3) Mix the antioxidant or compound antioxidant, light stabilizer and the masterbatch in step 2) uniformly, put it into the tape casting machine, and after cooling, embossing, pulling, and winding, the EVA film is obtained. The EVA optical glue The thickness of the film is 0.1-0.9 mm.

[0042] The EVA optical adhesive film prepared above is heated in a laminator under low pressure or close to vacuum condition...

Embodiment 1

[0044]Mix 100 parts of EVA, 5 parts of photoinitiator, 5 parts of multifunctional crosslinking agent, 1 part of coupling agent and 0.3 part of adhesive resin with VA content of 18% by weight proportioning to obtain the mixture; Extrude, mix evenly and extrude. The extrusion temperature is 120°C. The extruded product is cooled, pulled, and pelletized into masterbatches; mix 0.5 part of antioxidant or composite antioxidant, 0.5 part of light stabilizer and masterbatch evenly , put into casting machine, through cooling, embossing, traction, winding, obtain EVA optical adhesive film, the thickness of described EVA optical adhesive film is 0.2 mm.

[0045] The EVA optical adhesive film prepared above is heated in a laminator under low pressure or close to vacuum conditions to melt the EVA optical adhesive film, and irradiated under a mercury lamp or LED light source with a light intensity of 3000 Mw and a main peak wavelength of 310-365 nm After 120 seconds, it can be cross-linked ...

Embodiment 2

[0047] Mix 100 parts of EVA, 3 parts of photoinitiator, 3 parts of multifunctional crosslinking agent, 1.5 parts of coupling agent and 0.5 part of adhesive resin with VA content of 28% by weight proportioning, obtain mixture; Extrude, mix evenly and extrude. The extrusion temperature is 100°C. The extruded product is cooled, pulled, and pelletized into masterbatches; mix 0.4 parts of antioxidant or composite antioxidant and 0.4 parts of light stabilizer with the masterbatch evenly , drop into casting machine, through cooling, embossing, traction, winding, obtain EVA optical adhesive film, the thickness of described EVA optical adhesive film is 0.3mm.

[0048] The EVA optical adhesive film prepared above is heated in a laminator under low pressure or close to vacuum conditions to melt the EVA optical adhesive film, and irradiated under a mercury lamp or LED light source with a light intensity of 1200 Mw and a main peak wavelength of 310-365 nm In 90 seconds, it can be cross-lin...

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Abstract

The invention relates to an ultraviolet crosslinking and curing EVA (ethylene vinyl acetate copolymer) optical adhesive film and a preparation method thereof. The ultraviolet crosslinking and curing EVA optical adhesive film takes EVA or a mixture of the EVA and an EVA-modified graft polymer as a base material; in the mixture, the weight ratio of the EVA to the EVA-modified graft polymer is 1: 0-0.2; and according to 100 parts of the of the base material by total weight, the EVA optical adhesive film further comprises the following raw materials in part by weight: 0.1-5 parts of photoinitiator, 0.1-5 parts of multifunctional crosslinking agent, 0.1-1 part of antioxidant, 0.1-1 part of light stabilizer, 0.1-2 parts of coupling agent and 0.1-10 parts of bonding resin. The preparation method is short in operating time, small in required equipment investment, simple in process, convenient in operation and maintenance, energy-saving, environment-friendly and high in production efficiency; the production cost is reduced; the ultraviolet crosslinking and curing EVA optical adhesive film is low in defective ratio and excellent in mechanical properties; and during use, the ultraviolet crosslinking and curing EVA optical adhesive film can be crosslinked and adhered through radiation of specific ultraviolet, so that optical adhesive OCA and liquid optical adhesive LOCA for adhering a display in the traditional electronic industry can be replaced.

Description

[0001] technical field [0002] The invention relates to an EVA optical adhesive film and a preparation method thereof, in particular to an ultraviolet light-curable EVA optical adhesive film attached to a touch screen and a liquid crystal display panel and a preparation method thereof. Background technique [0003] In the electronics industry, OCA optical adhesive is one of the raw materials for important touch screens and LCD screens. It is made of optical acrylic adhesive without a substrate, and then laminated with a layer of release film on the upper and lower bottom layers. It is a substrate-free material. double-sided adhesive tape. It is the best adhesive for touch screens and LCD panels. However, OCA optical adhesive is difficult to attach, requires high precision, cannot be attached by hand, and is prone to air bubbles, which also requires very high requirements for equipment. On the basis of OCA optical glue, LOCA, a liquid optical glue, is developed. LOCA is a s...

Claims

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Application Information

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IPC IPC(8): C09J7/00C09J123/08C09J151/06C09J11/06
Inventor 俞哲卢超兰周福明
Owner GUANGZHOU HUICHI GLASS TECHNICAL CO LTD
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