UV tackified Mini LED and Micro LED direct display packaging adhesive tape

Abstract

The invention relates to the technical field of adhesive tape materials, in particular to a UV tackified Mini LED and Micro LED direct display packaging adhesive tape which comprises an OCA layer, the OCA layer comprises an acrylic resin polymer, a UV monomer, a photoinitiator, a curing agent, color paste and a solvent, and the weight ratio of the UV monomer is 0.1-5%. According to the packaging adhesive film prepared by the preparation method disclosed by the invention, the stripping force after UV curing is greater than 1200gf / 25mm, so that the tackifying requirement can be met; meanwhile, after being heated, the packaging adhesive film becomes soft, and the stripping force is obviously reduced, so that the packaging adhesive film is convenient to tear and repair.

Description

Technical Field

[0001] The present invention relates to the technical field of multimedia equipment, and in particular to a UV-adhesive Mini LED and Micro LED direct display packaging tape. Background Art

[0002] Mini LED / Micro LED direct display requires the packaging of LED chips on the substrate to cover, decorate and protect the chips.

[0003] Patent CN218372148U discloses a multi-layer laminated optical tape for Mini LED and Micro LED direct display packaging, which includes, from top to bottom, a functional hardened coating, a PET substrate layer, a black covering adhesive layer, a light diffusion adhesive layer, a UV hardened transparent layer and a PET release film layer. Although it can achieve encapsulation, it uses multiple adhesive layers and the overall thickness of the tape is still relatively thick.

[0004] In addition, after the packaging tape is packaged, when it needs to be repaired, its peeling force needs to be reduced to make it easier to peel off, thereby facilitating repair, but the current packaging films do not have this function. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a UV adhesion-enhanced Mini LED and MicroLED direct display packaging tape, which can effectively solve the above-mentioned problems of the prior art.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] The present invention provides a UV-adhesive Mini LED and Micro LED direct display packaging tape, which includes an OCA layer. The OCA layer includes an acrylic resin polymer, a UV monomer, a photoinitiator, a curing agent, a color paste and a solvent, and the weight proportion of the UV monomer is 0.1-5%.

[0009] According to some preferred embodiments of the present invention, the weight percentage of the UV monomer is 0.1-2%. For example, the weight percentage of the UV monomer can be 0.1%, 0.19%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, and any value within the range of any two of the above values.

[0010] According to some preferred embodiments of the present invention, the weight percentage of the UV monomer is 0.4-1%. For example, the weight percentage of the UV monomer can be 0.4%, 0.48%, 0.96%, 1%, and any value within the range of any two of the above values.

[0011] Furthermore, the acrylic resin polymer includes at least one or more of propoxylated neopentyl glycol acrylate, isooctyl acrylate, ethyl methacrylate and butyl acrylate.

[0012] Furthermore, the UV monomer includes at least one or more of NPGDA neopentyl glycol diacrylate, PDDA diethylene glycol phthalate diacrylate, TPGDA tripropylene glycol diacrylate, and PETA pentaerythritol triacrylate.

[0013] Furthermore, the photoinitiator includes 2,4,6-trimethylbenzoyldiphenoxyphosphine (TPO), a,a-dimethoxy-a-phenylacetophenone (651), and 1-hydroxycyclohexylphenyl ketone (184).

[0014] Furthermore, the curing agent includes at least one or more of diphenylmethane diisocyanate MDI, toluene diisocyanate TD I, and hexamethylene diisocyanate HD I.

[0015] Furthermore, the color paste is Nippon paint SN201 ET; the solvent is at least one of butanone or ethyl acetate.

[0016] Furthermore, the OCA layer includes, by weight, 70-100 parts of acrylic resin polymer, 0.1-5 parts of UV monomer, 0.1-1 parts of photoinitiator, 0.1-2 parts of curing agent, 0.5-5 parts of color paste and 5-30 parts of solvent.

[0017] According to some preferred embodiments of the present invention, the OCA layer includes, by weight, 75-85 parts of acrylic resin polymer, 0.2-2 parts of UV monomer, 0.1-0.5 parts of photoinitiator, 0.1-0.5 parts of curing agent, 2-4 parts of color paste and 15-25 parts of solvent.

[0018] According to some preferred embodiments of the present invention, the OCA layer includes, by weight, 75-85 parts of acrylic resin polymer, 0.2-1 parts of UV monomer, 0.1-0.5 parts of photoinitiator, 0.1-0.2 parts of curing agent, 2-4 parts of color paste and 18-22 parts of solvent.

[0019] According to some preferred embodiments of the present invention, the OCA layer includes 80 parts of acrylic resin polymer, 0.2-1 parts of UV monomer, 0.1-0.2 parts of photoinitiator, 0.2 parts of curing agent, 3 parts of color paste and 20 parts of solvent by weight. The encapsulation glue prepared by the components and proportions has a peeling force greater than 1300gf / 25mm after UV curing, and a peeling force less than 300gf / 25mm after reheating after UV curing, which can meet the requirements of easy tearing after repair.

[0020] According to some preferred embodiments of the present invention, the OCA layer includes, by weight, 80 parts of acrylic resin polymer, 1 part of UV monomer, 0.2 parts of photoinitiator, 0.2 parts of curing agent, 3 parts of color paste and 20 parts of solvent.

[0021] According to some preferred embodiments of the present invention, the OCA layer includes, by weight, 80 parts of acrylic resin polymer, 0.2 parts of UV monomer, 0.1 parts of photoinitiator, 0.2 parts of curing agent, 3 parts of color paste and 20 parts of solvent.

[0022] According to some preferred embodiments of the present invention, the OCA layer includes, by weight, 80 parts of acrylic resin polymer, 0.5 parts of UV monomer, 0.2 parts of photoinitiator, 0.2 parts of curing agent, 3 parts of color paste and 20 parts of solvent.

[0023] Furthermore, it also includes a substrate layer and a release film, wherein the substrate layer and the release film are connected via an OCA layer;

[0024] The substrate layer is a PET film, and the thickness of the substrate layer is 60-100 μm; the release film is a PET film, and the thickness of the release film is 80-120 μm; the thickness of the OCA layer is 80-120 μm.

[0025] Furthermore, it also includes a functional layer. The substrate layer is coated with a functional layer on the side away from the OCA layer. The functional layer is one or more of AG, AF and AR. The thickness of the functional layer is 10-20 μm.

[0026] According to some preferred embodiments of the present invention, the functional layer adopts one of anti-glare AG, anti-fingerprint AF and anti-reflection AR.

[0027] Beneficial Effects

[0028] The technical solution provided by the present invention has the following beneficial effects: the packaging film prepared by the present invention has a peeling force greater than 1200gf / 25mm after UV curing, which can meet the adhesion requirement; at the same time, after heating, the packaging film will soften and the peeling force will be significantly reduced, so that it is easy to tear and repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 This is a schematic diagram of the structure of a UV-adhesive Mini LED and Micro LED direct display packaging tape of the present invention;

[0031] The numbers in the figure represent:

[0032] Substrate layer 1, OCA layer 2, release film 3, functional layer 4. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention will be further described below in conjunction with the embodiments.

[0035] (I) Tape preparation

[0036] Example:

[0037] A UV adhesion Mini LED and Micro LED direct display packaging tape, comprising a substrate layer, an OCA layer, a release film layer and a functional layer, wherein the substrate layer and the release film layer are connected by the OCA layer; the substrate layer is coated with a functional layer away from the OCA layer, and the OCA layer is an optically transparent glue layer that can be cured after UV. The substrate layer is a PET film, and the thickness of the substrate layer is 75 μm. The release film is a PET film, and the thickness of the release film is 100 μm. The thickness of the OCA layer is 100 μm; the thickness of the functional layer is 15 μm.

[0038] The OCA layer includes acrylic resin polymer, UV monomer, photoinitiator, curing agent, color paste and solvent; among them, the acrylic resin polymer is ethyl methacrylate; the UV monomer is NPGDA neopentyl glycol diacrylate; the photoinitiator is 2,4,6-trimethylbenzoyl diphenylphosphine (TPO); the curing agent is 1,6-hexamethylene diisocyanate HDI; the color paste is Nippon paint SN201ET; and the solvent is butanone.

[0039] Examples 1-5 and Comparative Examples 1-3 were all prepared using the above-mentioned preparation method, and the formulas of the OCA layers in Examples 1-5 and Comparative Examples 1-3 are as follows:

[0040]

[0041] (II) Performance testing

[0042] Peel force determination method or standard: GB / T 2792-2014 "Test method for peel strength of adhesive tape";

[0043] 25℃ elastic modulus determination method or standard: ASTM D4440-15 Standard test method for plastics: dynamic mechanical properties melt rheology;

[0044]

[0045] The packaging films prepared by Examples 1-5 have peeling forces greater than 1200gf / 25mm after UV curing, which can meet the requirements of adhesion enhancement; at the same time, when heated at 120°C, the packaging films will soften, and the peeling force will be less than 300gf / 25mm, and the peeling force will be significantly reduced, so that it is easy to tear and repair. In Comparative Examples 1 and 2, when the UV monomer content is low or high, the peeling force after UV curing remains unchanged or decreases, resulting in the inability to meet the adhesion enhancement requirements. In addition, in Comparative Example 2, when the UV monomer content is high, it cannot soften after UV curing at 120°C, and the peeling force does not decrease significantly, resulting in the inability to meet the requirements of easy tearing and repair; in Comparative Example 3, when the photoinitiator content is 1.5 parts, the adhesion enhancement effect cannot be increased, that is, the photoinitiator content is sufficient to trigger the UV monomer to cross-link and cure.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A UV-adhesive Mini LED and Micro LED direct display packaging tape, characterized in that: The invention comprises an OCA layer, wherein the OCA layer comprises an acrylic resin polymer, a UV monomer, a photoinitiator, a curing agent, a color paste and a solvent, and the weight proportion of the UV monomer is 0.1-5%.

2. A UV adhesion Mini LED and Micro LED direct display packaging tape according to claim 1, characterized in that: In parts by weight, the OCA layer includes 70-100 parts of acrylic resin polymer, 0.1-5 parts of UV monomer, 0.1-1 parts of photoinitiator, 0.1-2 parts of curing agent, 0.5-5 parts of color paste and 5-30 parts of solvent; and the weight proportion of the UV monomer is 0.1-2%.

3. The UV adhesion-enhanced Mini LED and Micro LED direct display packaging tape according to claim 1, characterized in that: In parts by weight, the OCA layer includes 75-85 parts of acrylic resin polymer, 0.2-2 parts of UV monomer, 0.1-0.5 parts of photoinitiator, 0.1-0.5 parts of curing agent, 2-4 parts of color paste and 15-25 parts of solvent.

4. The UV adhesion-enhanced Mini LED and Micro LED direct display packaging tape according to claim 1, characterized in that: The acrylic resin polymer includes at least one or more of propoxylated neopentyl glycol acrylate, isooctyl acrylate, ethyl methacrylate and butyl acrylate.

5. The UV adhesion Mini LED and Micro LED direct display packaging tape according to claim 1, characterized in that: The UV monomer includes at least one or more of neopentyl glycol diacrylate, diethylene glycol diacrylate, tripropylene glycol diacrylate, and pentaerythritol triacrylate.

6. The UV adhesion-enhanced Mini LED and Micro LED direct display packaging tape according to claim 1, characterized in that: The photoinitiator includes 2,4,6-trimethylbenzoyldiphenoxyphosphine, a,a-dimethoxy-a-phenylacetophenone, and 1-hydroxycyclohexyl phenyl ketone.

7. The UV adhesion-enhanced Mini LED and Micro LED direct display packaging tape according to claim 1, characterized in that: The curing agent includes at least one of diphenylmethane diisocyanate, toluene diisocyanate, and 1,6-hexamethylene diisocyanate.

8. The UV adhesion-enhanced Mini LED and Micro LED direct display packaging tape according to claim 1, characterized in that: The color paste is Nippon paint SN201 ET; the solvent is at least one of butanone or ethyl acetate.

9. The UV adhesion Mini LED and Micro LED direct display packaging tape according to claim 1, characterized in that: It also includes a substrate layer and a release film, wherein the substrate layer and the release film are connected via an OCA layer; the substrate layer is a PET film, and the thickness of the substrate layer is 60-100 μm; the release film is a PET film, and the thickness of the release film is 80-120 μm; the thickness of the OCA layer is 80-120 μm.

10. The UV adhesion Mini LED and Micro LED direct display packaging tape according to claim 1, characterized in that: It also includes a functional layer. The side of the substrate layer facing away from the OCA layer is coated with the functional layer. The functional layer is one or more of AG, AF and AR. The thickness of the functional layer is 10-20 μm.

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