Ultraviolet (UV) adhesive capable of being stripped by heating and preparation method thereof

A technology of adhesives and resins, applied in the direction of adhesives, adhesive types, polyether adhesives, etc., can solve problems such as multi-working hours, disassembly failure, and scratches, so as to save operating hours and improve efficiency , Easy to operate and master the effect

Active Publication Date: 2019-05-07
络派科技(深圳)有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is an obvious defect in the use of UV glue bonding, that is, the curing of UV glue is irreversible.
After the shell of the electronic device is irradiated with UV glue, although good bonding strength can be obtained, it is very difficult to disassemble and rework, and the cured UV glue cannot be softened by heating, etc.
When the screen or shell is broken, it is often necessary to use external force to pick off the broken glass bit by bit, which takes a lot of man-hours, and the forced peeling off by external force is easy to leave scratches, and in severe cases, the display parts will be damaged. Permanent damage, easy to cause disassembly failure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Components:

[0033] UV glue 60 weight parts, adopt the ND-5204MJ series UV glue of Nano photonics chemical company;

[0034] The ethylene-vinyl acetate copolymer is 40 parts by weight, and the EVA 230 of the DuPont Company of the United States is used, and the mass percentage of the vinyl acetate polymer contained therein is 28%.

[0035] Preparation:

[0036] Crush the ethylene-vinyl acetate copolymer into 50 meshes, add it to the UV glue, and stir at 60 degrees to completely dissolve the ethylene-vinyl acetate copolymer into the UV glue, remove the foam and keep it for 60 minutes to prepare The curable ultraviolet adhesive.

[0037] Application scenario:

[0038] Bond the glass cover of the mobile phone screen.

[0039] Bonding method:

[0040] Spread the heat-peelable UV adhesive evenly on the surface of the mobile phone screen, cover the mobile phone screen with a glass cover, press the glass cover with a transparent pressure plate, irradiate with ultraviolet ...

Embodiment 2

[0046] Components:

[0047] 70 parts by weight of UV glue; 30 parts by weight of ethylene-vinyl acetate copolymer.

[0048] UV glue is composed of resin, monomer and photoinitiator. The resin comprises one of epoxy acrylate resin, polyurethane resin, polyacrylate resin, polyether acrylate resin, polyurethane acrylic resin or a combination thereof. The monomers include monofunctional monomers (IBOA, IBOMA, HEMA, etc.), difunctional monomers (TPGDA, HDDA, DEGDA, NPGDA, etc.), trifunctional monomers or multifunctional monomers (TMPTA, PETA, etc.); The initiator includes benzophenone.

[0049] The ethylene-vinyl acetate copolymer adopts EVA 220 of DuPont Company of the United States, and the mass percentage of vinyl acetate polymer contained therein is 28%.

[0050] Preparation:

[0051] Crush the ethylene-vinyl acetate copolymer into 100 meshes, add it to the UV glue, stir at 70 degrees to make the ethylene-vinyl acetate copolymer completely dissolve into the UV glue, remove ...

Embodiment 3

[0061] Components:

[0062] 65 parts by weight of UV glue; 35 parts by weight of ethylene-vinyl acetate copolymer.

[0063] The UV glue is composed of resin, monomer and photoinitiator. The resin is 20-40 parts by weight of epoxy acrylate resin and 15-35 parts by weight of polyacrylate resin. The monomer is 10-25 parts by weight of hydroxypropyl methacrylate and 10-25 parts by weight of isobornyl acrylate; the initiator is 1-5 parts by weight of 1-hydroxycyclohexyl phenyl ketone.

[0064] The ethylene-vinyl acetate copolymer adopts EVA150 of DuPont Company of the United States, and the mass percentage of vinyl acetate polymer contained therein is 33%.

[0065] Preparation:

[0066] Crush the ethylene-vinyl acetate copolymer into 80 meshes, add it to the UV glue, and stir at 65 degrees to completely dissolve the ethylene-vinyl acetate copolymer into the UV glue, remove the foam and keep it for 100 minutes to prepare The curable ultraviolet adhesive.

[0067] Application sc...

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PUM

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Abstract

The invention relates to an ultraviolet (UV) adhesive capable of being stripped by heating and a preparation method thereof. The UV adhesive can be used for bonding an object after being cured by ultraviolet irradiation, and the bonded object can be stripped by heating. The UV adhesive capable of being stripped by heating is composed of a UV adhesive and an ethylene-vinyl acetate copolymer, wherein the UV adhesive contains one or a combination of more selected from epoxy acrylate resin, polyurethane resin, polyacrylate resin, polyether acrylate resin and polyurethane acrylate resin, and the mass percentage of the ethylene-vinyl acetate copolymer to the UV adhesive capable of being stripped by heating is 30-40%, and preferably 35%. The invention further provides the preparation method of the UV adhesive capable of being stripped by heating. The UV adhesive disclosed by the invention can be cured for bonding by ultraviolet irradiation and is easy to operate and master. In addition, the operation of stripping by heating can be carried out at a lower temperature, so that the operation time can be greatly saved, and reworking and repairing efficiency is improved.

Description

technical field [0001] The invention relates to an adhesive used for bonding screens or casings of electronic equipment such as mobile phones, in particular to a heat-peelable UV adhesive and a preparation method thereof. Background technique [0002] Most of the screens or casings of electronic devices such as mobile phones, tablet computers, and portable notebook computers need to be bonded with glue to ensure the waterproofness of the connecting parts. As the thin and light designs of electronic devices become more and more popular, the screens and casings of these thin and light electronic devices are particularly easy to break, and the screens or casings that are bonded are very difficult to disassemble and separate. [0003] For example, the screens or glass casings of the latest models of existing consumer brands are mostly bonded with UV glue. UV glue, also known as shadowless glue or ultraviolet glue, is a one-component UV visible light curing modified acrylic stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J163/10C09J171/00C09J175/14C09J123/08C09J133/04C09J4/06
Inventor 刘丽梅张天旭邓毅刘汶浦郑艳红赵曦野张盛楠张威
Owner 络派科技(深圳)有限公司
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