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High-filling-property SCA optical adhesive as well as preparation method and application thereof

An optical glue and filling technology, applied in the field of optical glue, can solve the problems of bubble rebound, low production efficiency, unstable ring measurement, etc., and achieve the effect of increasing filling performance, improving flow performance, and good flow performance

Pending Publication Date: 2022-03-18
SHENZHEN GAOREN ELECTRONICS NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The LOCA process of liquid glue is complicated and the production efficiency is low; the production efficiency of solid glue is high, but there is a low level difference coverage, and there are fatal problems of ring measurement instability and bubble rebound when high level difference lamination
At present, the solid glue on the market has the best coverage rate of about 20%, and there is still the problem of instability in the ring test.

Method used

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  • High-filling-property SCA optical adhesive as well as preparation method and application thereof
  • High-filling-property SCA optical adhesive as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] The preparation method of the highly filling SCA optical glue may further comprise the steps:

[0028] (1) After mixing the EVA resin, cross-linking agent, coupling agent and photoinitiator in their respective proportions, make the microcrystalline wax into powder, add it to the mixed ingredients, and mix again.

[0029] (2) Import the prepared mixture into a twin-screw extruder, extrude it through a melt pump at the end of the extruder, extrude it through a screen change filter, and calender to form a film, and at the same time attach a layer to the front and back of the film The optical adhesive film is prepared by protecting the release film; wherein, the thickness of the optical adhesive layer can be 200 μm.

[0030] The selected VA content of the EVA resin used in the following examples is 28%, and the MI is 15g / (10min).

Embodiment 1

[0031] Example 1: Highly filling SCA optical glue

[0032] In this embodiment, the highly filling SCA optical glue, its components include by mass percentage: EVA resin content of 95%, tert-butyl peroxy-2-ethylhexanoate content of 1%, γ-methacryloyl The content of oxypropyltrimethoxysilane and N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (mass ratio 1:1) is 1%, 1-hydroxycyclohexyl phenyl ketone The content of 2-hydroxy-2-methyl-1-phenyl-1-propanone (mass ratio: 2:1) is 0.5%, and the content of microcrystalline wax is 2.5%.

[0033] The preparation method is as follows:

[0034] (1) After mixing the EVA resin, crosslinking agent, coupling agent and photoinitiator in their respective proportions, the microcrystalline wax is made into powder, added to the mixed ingredients, and mixed evenly again;

[0035] (2) Import the prepared mixture into a twin-screw extruder, extrude it through a melt pump at the end of the extruder, extrude it through a screen change filter, and calend...

Embodiment 2

[0036] Example 2: Highly filling SCA optical glue

[0037] In this embodiment, the highly filling SCA optical glue, its components include by mass percentage: EVA resin content of 98%, tert-butyl peroxy-2-ethylhexanoate content of 0.2%, γ-methacryloyl The content of oxypropyltrimethoxysilane is 0.2%, the content of 1-hydroxycyclohexyl phenyl ketone is 0.1%, and the content of microcrystalline wax is 1.5%.

[0038] The preparation method is the same as in Example 1.

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Abstract

The invention discloses a high-filling-property SCA optical adhesive and a preparation method thereof. The SCA optical cement comprises the following components in percentage by mass: 95%-98% of EVA (Ethylene-Vinyl Acetate) resin, 0.2%-1% of a cross-linking agent, 0.2%-1% of a coupling agent, 0.1%-1% of a photoinitiator and 1%-3% of microcrystalline wax. The section difference coverage rate of the SCA optical cement provided by the invention can reach 50%, and the environmental measurement is stable and risk-free. By controlling the VA content and MI in the EVA resin, the flowing property of the optical adhesive is improved, and a certain amount of microcrystalline wax is added, so that the flowing property of the optical adhesive is further improved, and the filling property of the optical adhesive is improved after the optical adhesive is attached to a display screen or a functional sheet. When reliability testing is carried out, the problems of bubbles and the like cannot occur. In the whole laminating process, the flowing property of the optical cement is excellent, and the filling property is greatly improved.

Description

technical field [0001] The invention relates to the field of optical adhesives, in particular to a high-filling SCA optical adhesive and its preparation method and application. Background technique [0002] At present, optical glue is widely used in the bonding of touch screens and the full bonding of LCD screens and touch screens. The LOCA process of liquid glue is complicated and the production efficiency is low; the production efficiency of solid glue is high, but there is a low step coverage rate, and there are fatal problems such as unstable ring measurement and bubble rebound when laminating with high step difference. At present, the solid glue on the market has a best coverage rate of about 20%, and there is still the problem of instability in the ring test. Contents of the invention [0003] Aiming at the defects in the prior art, the invention provides a highly filling SCA optical adhesive. The step difference coverage rate of the SCA optical glue can reach 50%,...

Claims

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Application Information

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IPC IPC(8): C09J123/08C09J11/08C09J7/10C09J7/30
CPCC09J123/0853C09J11/08C09J7/10C09J7/30C08L91/06
Inventor 孙仕兵顾孔胜周双荣
Owner SHENZHEN GAOREN ELECTRONICS NEW MATERIAL
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