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OCA (Optical Clear Adhesive) as well as preparation method and application thereof

A film and resin technology, applied in the field of optical glue, can solve the problems of insufficient performance of adhesion and recovery of deformation, etc.

Active Publication Date: 2022-05-27
甘志鸿
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the OCA glue disclosed in the related art has insufficient performance in cohesiveness and recovery of deformation, and needs to be further improved.

Method used

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  • OCA (Optical Clear Adhesive) as well as preparation method and application thereof
  • OCA (Optical Clear Adhesive) as well as preparation method and application thereof
  • OCA (Optical Clear Adhesive) as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] The present embodiment prepares a kind of OCA glue, and the specific process is:

[0082] S1. Control the ambient temperature to 15°C, dissolve the photoinitiator in the solvent, then add a mixture of isooctyl acrylate, acrylic acid and hydroxyethyl acrylate to it, stir evenly, and use a light intensity of 8W / m 2 The resulting mixed system is irradiated with a mercury lamp (main peak wavelength 250nm), and the irradiation is stopped after the weight-average molecular weight of the obtained product is > 2 million (while the molecular weight needs to be controlled < 3 million, the weight-average molecular weight of the acrylate resin obtained in this example is about 230 Ten thousand);

[0083] S2. Control the temperature of the mixture obtained in step S1 to be 10-15°C, and under stirring at 300 rpm, add curing agent, tackifier and antioxidant to the mixture obtained in step S1 in sequence, and then continue to stir for 10 min.

[0084] Unless otherwise specified, in th...

Embodiment 4

[0088] A kind of OCA glue is prepared in this example, and the difference between the specific process and Example 1 is:

[0089] (1) In step S1, the light intensity of the mercury lamp is 45W / m 2 ; Correspondingly, the weight-average molecular weight of the obtained acrylate resin is about 2.01 million.

Embodiment 5

[0091] This embodiment prepares a kind of OCA film, and the specific process is:

[0092] D1. Using extrusion coating method, coat the OCA adhesive obtained in Example 1 on the surface of the PET release film with a thickness of 50 μm; cover the surface of the newly coated OCA adhesive with a layer of PET release film; the coating thickness is : Design OCA film thickness 15μm;

[0093] D2. The light intensity is 400W / m 2 The mercury lamp (main peak wavelength 250nm) irradiates the product obtained in step S1 for 1min;

[0094] D3. Send the parts obtained in step D2 into a flat plate hot press, apply a pressure of 0.1 MPa, and cure at 90° C. for 3 minutes.

[0095] The thickness of the OCA film (only the OCA film layer) obtained in this example is about 15.1 μm (the average value is obtained after testing 10 points with a micrometer).

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Abstract

The invention discloses an OCA (Optical Clear Adhesive) as well as a preparation method and application thereof, and belongs to the technical field of optical adhesives. The OCA adhesive is prepared from the following raw materials: acrylate resin and a curing agent, the weight-average molecular weight of the acrylate resin is greater than 2 million; the acrylate resin is prepared from the following raw materials in parts by weight: 90-100 parts of 2-ethylhexyl acrylate; 1-5 parts of acrylic acid; 1 to 5 parts of hydroxyethyl acrylate; 0.5 to 1.5 parts of a photoinitiator; the curing agent comprises polyamine and isocyanate. According to the OCA adhesive disclosed by the invention, through the design of the preparation raw materials, the Tg temperature of less than-40 DEG C can be obtained after curing, and excellent appearance can still be kept after a dynamic bending test is performed for 200,000 times. The invention also provides a preparation method and application of the OCA adhesive.

Description

technical field [0001] The invention belongs to the technical field of optical glue, and particularly relates to an OCA glue and a preparation method and application thereof. Background technique [0002] With the continuous development of information technology, mobile phones have become an indispensable tool in people's work and life. Regarding the screen of the mobile phone, it has undergone major transformations from black and white to color, from small to large, and from visual to human-computer interaction. Now, in order to obtain a larger screen while making the phone easier to store, folding phones are taking the market by storm, and with it comes a lot of demand and higher requirements for folding screens. [0003] A folding screen generally includes a display component, a polarizing component, and a protective film (CG for short for cover plate), and optical glue (OCA glue) is used to bond these three components. The OCA film used for the folding screen needs to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/08C09J7/30C09J7/40G09F9/30C08F220/18C08F220/06C08F220/20
CPCC09J133/066C09J7/30C09J7/40G09F9/301C08F220/1808C09J2203/318C08F220/06C08F220/20
Inventor 夏建明吴朝学唐宇飞候忠权谢圣坚黄添祥林翠芳
Owner 甘志鸿
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