UV-tackifiable adhesive tape and preparation method therefor

Abstract

A UV-tackifiable adhesive tape and a preparation method therefor. The UV-tackifiable adhesive tape comprises a substrate layer, a UV-tackifiable adhesive layer and a release film layer, wherein the substrate layer, the UV-tackifiable adhesive layer and the release film layer are sequentially laminated from bottom to top; and the UV-tackifiable adhesive layer comprises a modified polyester resin, a monofunctional UV photocuring monomer, a polyfunctional photocuring compound, a curing agent, a photoinitiator and a stabilizer. The UV-tackifiable adhesive layer comprises the modified polyester resin as a basic polymer, and the polyester resin can effectively improve the adhesion between the adhesive layer and a substrate before UV curing of the UV-tackifiable adhesive layer, improve the bonding strength between the UV-tackifiable adhesive layer having been UV-cured and an adhered object, and also enhance the high-temperature release force and weather resistance of the UV-tackifiable adhesive layer having been UV-cured.

Description

UV-adhesive tape and preparation method thereof TECHNICAL FIELD

[0001] The present application relates to the technical field of new materials of adhesive tape, and particularly relates to a UV-adhesive tape and a preparation method thereof. BACKGROUND

[0002] A layer of adhesive tape needs to be attached to the surface of display components, cover glass and other parts of electronic devices such as mobile phones and computers to provide support, reinforcement and explosion-proof functions. The initial adhesion of the adhesive tape is low when it is attached to the surface of the protected material, and the 180° peeling force is 0.01-9 N / 25 mm. When the adhesive tape needs to be reworked or removed, the low initial adhesion allows the adhesive tape to be easily torn off without damaging the surface of the attached object, leaving no residue or pollution. After the attachment and reworking processes are completed, the adhesion strength between the adhesive tape and the attached object needs to be increased to meet the requirements of structural support and aging resistance. The ways to increase the adhesion strength include heat reaction adhesion (heat adhesion) and UV light reaction adhesion (UV adhesion). Heat adhesion increases the adhesion strength by heating to initiate a chemical reaction in the adhesive layer of the adhesive tape. However, this method has limitations in many applications due to the long reaction time and the requirement for temperature resistance of the attached material. UV adhesion improves the adhesion strength between the adhesive tape and the surface of the protected material by initiating a chemical reaction in the adhesive layer through light irradiation. The advantage of this method is high reaction efficiency and no need for high-temperature treatment.

[0003] Currently, the UV adhesion scheme adopted in the patent disclosed by Ritsuo (Patent No. CN111876092A) has a large volume shrinkage due to excessive UV crosslinking reaction, which causes warping and deformation of the product during the aging process, affecting the attachment of the product and the stability of the later processing parameters. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the present application provides a UV-adhesive tape and a preparation method thereof.

[0005] TECHNICAL SCHEME

[0006] To achieve the above-mentioned purposes, the present application is implemented by the following technical scheme:

[0007] A UV-adhesive tape, which comprises a main resin, a photocuring composition, a curing agent and a photoinitiator, the photocuring composition comprises one or both of a monofunctional UV photocuring monomer and a multifunctional photocuring compound; the main resin is an acrylic modified polyester resin.

[0008] Further, the acrylic modified polyester resin contains hydroxyl groups or carboxyl groups.

[0009] The acrylic modified polyester resin is synthesized by grafting (meth)acrylate monomers to a hydroxyl-terminated polyester resin;

[0010] The acrylic modified polyester resin is synthesized by grafting (meth)acrylate monomers to a hydroxyl-terminated polyester resin;

[0011] Preferably, the acrylic modified polyester resin is synthesized by grafting (meth)acrylate monomers to a hydroxyl-terminated polyester resin under nitrogen protection, by weight parts, 75 parts of the hydroxyl-terminated polyester resin, 100 parts of an organic solvent, 2.18 parts of methacryloyl isocyanate (MOI), 0.075 parts of dibutyltin dilaurate are added into a reactor, heated to 60°C, and reacted at this temperature for 5 hours; the temperature is raised to 80°C, and then a mixture of 20 parts of (meth)acrylate monomers and 1 part of a free radical polymerization initiator is slowly added into the reactor, and grafted polymerization is carried out for 4 hours to obtain an acrylic modified polyester resin solution.

[0012] Preferably, the organic solvent is ethyl acetate, toluene, acetone, butanone and isopropyl alcohol mixed in any proportion;

[0013] Preferably, the (meth)acrylate monomer includes at least one of (meth)acrylic acid methyl ester, (meth)acrylic acid ethyl ester, (meth)acrylic acid butyl ester, (meth)acrylic acid 2-ethylhexyl ester, (meth)acrylic acid octyl ester, (meth)acrylic acid dodecyl ester, (meth)acrylic acid stearyl ester and (meth)acrylic acid behenyl ester, and the like.

[0014] Preferably, the (meth)acrylate monomer includes at least one of (meth)acrylic acid ethyl ester, (meth)acrylic acid butyl ester and (meth)acrylic acid 2-ethylhexyl ester, and most preferably, the (meth)acrylate monomer is (meth)acrylic acid butyl ester.

[0015] In the present specification, (meth)acrylate refers to acrylate and / or methacrylate;

[0016] The free radical polymerization initiator is selected from at least one or both of benzoyl peroxide and azobisisobutyronitrile.

[0017] Further, the photocurable composition is composed of a monofunctional UV photocurable monomer and a multifunctional photocurable compound; the weight ratio of the monofunctional UV photocurable monomer and the multifunctional photocurable compound is 1:2-5; preferably, the weight ratio of the monofunctional UV photocurable monomer and the multifunctional photocurable compound is 1:3.

[0018] The multifunctional photocurable compound is a multifunctional (meth)acrylate monomer, a multifunctional polyurethane (meth)acrylate oligomer or a multifunctional polyester acrylate oligomer, and the functionality of the multifunctional photocurable compound is ≤3.

[0019] The multifunctional (meth)acrylate monomer is at least one of 1,4-butanediol diacrylate, 1,4-butanediol dimethacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, neopentyl glycol diacrylate, polyethylene glycol diacrylate, polypropylene glycol diacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, glycerol triacrylate and the like.

[0020] Further, the monofunctional UV photocurable monomer is at least one of 2-phenoxyethyl acrylate, ethoxyethoxyethyl acrylate, tetrahydrofurfuryl acrylate, lauryl acrylate, isodecyl acrylate, isononyl acrylate, methoxypolyethylene glycol (350) methacrylate and the like monomers.

[0021] The monofunctional UV photocurable monomer is at least one of 2-phenoxyethyl acrylate (PHEA Tg 7℃), ethoxyethoxyethyl acrylate (EOEOEA-56℃), tetrahydrofurfuryl acrylate (THFA-15℃), lauryl acrylate (LA-30℃), isodecyl acrylate (ISODA-58℃), isononyl acrylate (INAA-60℃), methoxypolyethylene glycol (350) methacrylate (-62℃) and the like monomers.

[0022] Further, the photoinitiator is at least one of 1-hydroxycyclohexyl phenyl ketone, 2,4,6-trimethylbenzoyldiphenyl phosphine oxide, 2,4,6-trimethylbenzoyl ethyl phenyl phosphinate, phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 2-dimethylamino-2-benzyl-1-(4-piperidinophenyl)-1-butanone and the like radical type photoinitiators.

[0023] Further, it further comprises a stabilizer, the stabilizer is a phenolic compound or a quinone compound, the stabilizer is one or a mixture of several of 4-methoxyphenol, 4-methoxynaphthol, tertiary butyl hydroquinone, dibutyl hydroxytoluene, benzoquinone, 1,4-naphthoquinone.

[0024] Further, it comprises 30-50 parts by weight of an acrylic modified polyester resin, 5-30 parts by weight of a monofunctional UV light curing monomer, 5-30 parts by weight of a multifunctional light curing compound, 0.2-1.5 parts by weight of a curing agent, 0.5-2 parts by weight of a photoinitiator, and 0.01-0.1 parts by weight of a stabilizer.

[0025] Preferably, it comprises 35 parts by weight of an acrylic modified polyester resin, 5 parts by weight of a monofunctional UV light curing monomer, 15 parts by weight of a multifunctional light curing compound, 0.75 parts by weight of a curing agent, 1.5 parts by weight of a photoinitiator, and 0.05 parts by weight of a stabilizer.

[0026] Further, the curing agent is a polyisocyanate curing agent or a carboxyl crosslinking agent capable of reacting with hydroxyl or carboxyl groups;

[0027] The polyisocyanate curing agent is a compound containing two or more isocyanate groups in one molecule, which is one of an aromatic polyisocyanate or an aliphatic polyisocyanate;

[0028] The carboxyl crosslinking agent is one or more of a multifunctional aziridine (trimethylolpropane-tris[3-(2-methylaziridinyl)propionate], SC-100) and a tetrafunctional epoxy resin (N,N,N',N'-tetraglycidyl-m-diaminobenzene, GA-240).

[0029] A UV tacky adhesive tape, comprising a substrate layer, a UV tacky adhesive layer prepared by coating the UV tacky adhesive described above on the surface of the substrate layer, and a release film layer attached to the side of the UV tacky adhesive layer away from the substrate layer;

[0030] The thickness of the release film layer is 25-100 μm, and the release film layer is a silicone release film or a non-silicone release film; preferably, the release film layer is PET.

[0031] The thickness of the UV tacky adhesive layer is 5 μm-100 μm.

[0032] The substrate layer is one of PET, PO / PP / PE, PI or PEN, and the thickness of the substrate layer is 5 μm-300 μm. Preferably, the substrate layer is PET.

[0033] The substrate layer is PET (polyethylene terephthalate), PO / PP / PE (polyolefin film), PI (polyimide film) or PEN (polyethylene naphthalate), and the thickness of the substrate layer is 5-300 microns.

[0034] A preparation method of a UV tackifying adhesive tape, comprising the following steps:

[0035] (1) adding an acrylic modified polyester resin, a monofunctional UV light curing monomer and a multifunctional UV light curing compound into an organic solvent, stirring uniformly to obtain a mixed solution, adding a curing agent, a photoinitiator and a stabilizer into the organic solvent and into the mixed solution, stirring uniformly to obtain a UV tackifying adhesive;

[0036] (2) coating the UV tackifying adhesive obtained in step (1) onto a substrate surface, drying and curing at 50-130 DEG C for 3-5 minutes and adhering a release film, aging at 40-50 DEG C for 48-72 hours to obtain a UV tackifying adhesive tape;

[0037] In step (1), the organic solvent is one or more of ethyl acetate, toluene, acetone, butanone and isopropyl alcohol mixed in any proportion. Advantages

[0038] The technical solution provided by the application has the following advantages:

[0039] (1) The polyester resin and the PET as the substrate are both polyester materials, so the prepared UV tackifying adhesive layer has high cohesive strength and good PET substrate adhesion; the UV adhesive layer obtained by using the acrylic modified polyester resin does not have a significant increase in the initial peeling force with the extension of the storage time before the UV tackifying reaction, so the adhesive tape can be easily removed without damaging the adherend and causing pollution such as residue.

[0040] (2) After the UV tackifying reaction, the modified polyester resin can improve the bonding strength between the adhesive tape and the adherend, and the adhesive layer has no separation, bubbling, haze increase and other defects.

[0041] (3) The UV tackifying film and the preparation method thereof, the UV tackifying adhesive layer uses the acrylic modified polyester resin as the base polymer, which can effectively improve the adhesion between the adhesive layer and the substrate before UV curing, improve the bonding strength between the UV tackifying film after UV curing and the adherend, and improve the high temperature peeling force, weather resistance of the UV tackifying film after UV curing. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0043] Figure 1 is a schematic diagram of the UV adhesion tape structure of the present application.

[0044] The reference numerals in the figure respectively represent:

[0045] 1 - substrate layer, 2 - UV adhesion glue layer, 3 - release film layer. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0047] The following will further describe the present application in combination with the embodiments.

[0048] (I) UV adhesion tape preparation

[0049] Example 1:

[0050] A UV adhesion tape, comprising the following steps:

[0051] (1) 35 parts of acrylic modified polyester resin, 5 parts of monofunctional UV light curing monomer and 15 parts of multifunctional UV light curing compound are added into 100 parts of ethyl acetate, and after stirring uniformly, a mixed solution is obtained; 0.75 parts of curing agent, 1.5 parts of photoinitiator and 0.05 parts of stabilizer are respectively dissolved in 10 parts of ethyl acetate, and then added into the above mixed solution, and after stirring uniformly, a UV adhesion glue is obtained;

[0052] (2) The obtained UV adhesion glue is coated on a 75 μm thick transparent PET film, the coating amount of the coating liquid is 52 g / m 2 , dried at 110℃ for 3 min, laminated with a 50 μm thick transparent PET release film, post-cured at 40℃ for 48 h, and a UV adhesion tape is obtained, wherein the thickness of the UV adhesion glue layer is 13 μm.

[0053] The preparation method of the acrylic modified polyester resin is as follows:

[0054] Under nitrogen protection, 75 parts of hydroxyl-terminated polyester resin, 100 parts of ethyl acetate, 2.18 parts of methacrylic acid isocyanide ethyl ester (MOI), 0.075 parts of dibutyl tin dilaurate catalyst were added into a reactor by weight parts, and the temperature was raised to 60°C for 5h; then the temperature was raised to 80°C, and then a mixture of 20 parts of butyl methacrylate and 1 part of free radical polymerization initiator (benzoyl peroxide and azobisisobutyronitrile, and the weight ratio is 2:1) was slowly added into the reaction container, and the graft polymerization reaction was carried out for 4h to obtain an acrylic modified polyester resin solution.

[0055] Hydroxyl-terminated polyester resin, Japan Toyo Spinning Company model GK680 (hydroxyl value: 21 mg / g KOH); MOI (MOI monomer, methacrylic acid isocyanide ethyl ester, Japan Showa Denko), Shanghai Maikelin Company;

[0056] Monofunctional UV light curing monomer 2-phenoxyethyl acrylate (PHEAT g7℃);

[0057] Polyfunctional UV light curing compound polyethylene glycol (400) diacrylate;

[0058] Curing agent polyisocyanate curing agent (Desmodur L 75, NCO content = 13.3%);

[0059] Photoinitiator 1-hydroxy cyclohexyl phenyl ketone;

[0060] Stabilizer 4-methoxy phenol;

[0061] Example 2:

[0062] The difference from example 1 is only that the weight parts of monofunctional UV light curing monomer is 2 parts, and the weight parts of polyfunctional UV light curing compound is 10 parts;

[0063] Example 3:

[0064] The difference from example 1 is only that the polyfunctional UV light curing compound is polyethylene glycol (200) diacrylate;

[0065] Comparative example 1:

[0066] The difference from example 1 is only that the modified polyester resin is replaced by polyacrylate random copolymer (Tg = -35℃, Mw = 8000000, hydroxyl value = 13 mg KOH / g, acid value = 28 mg KOH / g);

[0067] Comparative example 2:

[0068] The difference from Example 1 is only that the modified polyester resin is replaced by a polyacrylate triblock copolymer (polymethyl methacrylate-b-poly(n-butyl acrylate)-b-polymethyl methacrylate, PMMA-b-PnBA-b-PMMA, Mw = 1 million, molecular weight distribution PDI = 1.3);

[0069] Comparative Example 3:

[0070] The difference from Example 1 is only that the polyethylene glycol (400) diacrylate is replaced by dipentaerythritol hexaacrylate.

[0071] Comparative Example 4:

[0072] The difference from Example 1 is only that no monofunctional UV light curing monomer is added;

[0073] Comparative Example 5:

[0074] The difference from Example 1 is only that no multifunctional UV light curing compound is added;

[0075] (B) Performance Test

[0076] The UV adhesion tape prepared in the above examples and comparative examples was respectively tested for peel strength before and after UV, reliability aging performance under different conditions, and aging shrinkage rate, and the test method was as follows.

[0077] (1) Initial 180° peel strength test: each example sample was cut into 25 mm wide and 250 mm long, the release film was removed and attached to a 75 μm*50 mm*150 mm PI film, the end of each strip was clamped on the stretching clamp of the tensile testing machine, and 180° peeling was performed at a speed of 300 mm / min, and the average value of 5 groups of data was obtained.

[0078] (2) UV adhesion 180° peel strength test: each example sample was cut into 25 mm wide and 250 mm long, the release film was removed and attached to a 75 μm*50 mm*150 mm PI film, a 365 nm LED light source was used to irradiate the sample, the light energy was 4000 mj / cm 2 (200 mw / cm 2 intensity for 20 seconds), the end of each strip was clamped on the stretching clamp of the tensile testing machine, and 180° peeling was performed at a speed of 300 mm / min, and the average value of 5 groups of data was obtained.

[0079] (3) Base material adhesion test: According to the JIS K 5600 standard, 10 x 10 squares were drawn on the adhesive layer of the UV tackified tape sample prepared above at 1 mm intervals, and after covering with a transparent tape (3M, Scotch Tape), it was quickly peeled off at an angle of 90°, and the number of squares that were not peeled off was recorded, and the results were judged according to the following criteria:

[0080] O: 100 / 100

[0081] Δ: 99 / 100 ~ 80 / 100

[0082] X: 0 / 100 ~ 79 / 100

[0083] (4) Double 85 aging test: Each sample was cut into 50 mm wide and 150 mm long, and the release film was removed and attached to a 75 μm * 100 mm * 200 mm PI film. The sample was irradiated with a 365 nm LED light source, and the light energy was 4000 mj / cm 2 (200 mw / cm 2 for 20 seconds), and the sample was placed in a constant temperature and humidity chamber at 85°C & 85% relative humidity for 240 hours. Whether there were bubbles, delamination, cracking, and other defects between the sample and the PI film was observed. If there were no such defects, it was "pass", and if there were any defects, it was "fail".

[0084] (5) 60°C / 90% aging test: Each sample was cut into 50 mm wide and 150 mm long, and the release film was removed and attached to a 75 μm * 100 mm * 200 mm PI film. The sample was irradiated with a 365 nm LED light source, and the light energy was 4000 mj / cm 2 (200 mw / cm 2 for 20 seconds), and the sample was placed in a constant temperature and humidity chamber at 60°C & 90% relative humidity for 240 hours. Whether there were bubbles, delamination, cracking, and other defects between the sample and the PI film was observed. If there were no such defects, it was "pass", and if there were any defects, it was "fail".

[0085] (6) -40°C aging test: Each sample was cut into 50 mm wide and 150 mm long, and the release film was removed and attached to a 75 μm * 100 mm * 200 mm PI film. The sample was irradiated with a 365 nm LED light source, and the light energy was 4000 mj / cm 2 (200 mw / cm 2 for 20 seconds), and the sample was placed in a constant temperature and humidity chamber at -40°C relative humidity for 240 hours. Whether there were bubbles, delamination, cracking, and other defects between the sample and the PI film was observed. If there were no such defects, it was "pass", and if there were any defects, it was "fail".

[0086] (7) Cold-thermal shock aging test: each sample is cut into 50mm wide, 150mm long, the release film is removed and attached on a 75um*100mm*200mm PI film, a 365nm LED light source is used to irradiate the sample, the light energy is 4000mj / cm 2 (200mw / cm 2 for 20 seconds), the sample is placed in a-40℃~85℃ cycle / 30min cold-thermal shock box for aging for 100 cycles, whether there is bubble, delamination, fracture and other defects between the sample and the PI film is observed, if there is no above defects, it is "qualified", if there is any defect, it is "unqualified".

[0087] (8) Aging shrinkage rate test: each sample is cut into A4 sample size, the release film is removed and attached on a 250mm*330mm glass plate, a 365nm LED light source is used to irradiate the sample, the light energy is 4000mj / cm 2 (200mw / cm 2 for 20 seconds), the four perimeter lengths of the sample are tested by using a high-precision two-dimensional microscope; the sample is placed in a constant temperature and humidity box with 85℃ and 85% relative humidity for aging for 240 hours, after being taken out and cooled to room temperature, the four perimeter lengths of the sample are tested again by using the above microscope, and the aging shrinkage rate formula is:

[0088] The specific test results are shown in the following table:

[0089] The UV tack adhesive tape of the application adopts modified polyester resin, which reduces the volume shrinkage and stress of the system in the photocuring process, avoids the stress caused by the volume shrinkage of photocuring in the application process, and causes the product to warp and deform, and can also improve the peeling force after UV tack, and the UV tack 180° peeling force is greater than 1200g / 25mm. In addition, the UV tack adhesive of the application adopts modified polyester resin, and the product can resist folding and has high creep recovery.

[0090] The modified polyester resin and PET as the base material are both polyester materials, therefore, the prepared UV tack adhesive layer has high cohesive strength and good PET base material adhesion. The UV adhesive layer obtained by modifying the polyester resin with acrylic acid does not have obvious increase in initial peeling force with the extension of storage time before UV tack reaction, so that it can be easily removed, and the removal of the adhesive tape will not cause damage and residue pollution to the attached object. After UV tack reaction, the modified polyester resin can improve the bonding strength between the adhesive tape and the attached object.

[0091] The UV adhesion film and the preparation method thereof, the UV adhesion film adopts acrylic modified polyester resin as a base polymer, can effectively improve the adhesion between the UV adhesion film and the substrate before UV curing, improve the bonding strength between the UV adhesion film and the pasted object after UV curing, and improve the high-temperature peeling force and weather resistance of the UV adhesion film after UV curing.

[0092] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A UV tackifying glue, characterized by, It includes main body resin, light curing composition, curing agent and photoinitiator, the light curing composition includes monofunctional UV light curing monomer, multifunctional light curing compound; the main body resin is acrylic modified polyester resin; the acrylic modified polyester resin is synthesized by grafting (methyl) acrylate monomer to hydroxyl-terminated polyester resin.

2. A UV tackified glue according to claim 1, characterized in that, The synthesis method of acrylic modified polyester resin is as follows: Under the protection of nitrogen, 60-90 parts of hydroxyl-terminated polyester resin, 100 parts of organic solvent, 0.5-3 parts of isocyanatoethyl methacrylate (MOI), 0.01-0.10 parts of dibutyl tin dilaurate are added into the reactor according to weight parts, the temperature is raised to 50-70℃, and the reaction is carried out at the temperature for 4-6h; Then the temperature is raised to 70-90℃, then a mixture of 7-39.5 parts of (methyl) acrylate monomer and 0.1-2 parts of free radical polymerization initiator is slowly added into the reactor, and the graft polymerization reaction is carried out for 3-5h to obtain the acrylic modified polyester resin solution.

3. The UV tackified glue of claim 1, wherein, The weight ratio of the monofunctional UV light curing monomer and the multifunctional light curing compound is 1:2-5; The multifunctional light curing compound is multifunctional (methyl) acrylate monomer, multifunctional polyurethane (methyl) acrylate oligomer or multifunctional polyester acrylate oligomer, and the functionality of the multifunctional light curing compound is ≤3; The multifunctional (methyl) acrylate monomer is at least one of 1,4-butanediol diacrylate, 1,4-butanediol dimethacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, neopentyl glycol diacrylate, polyethylene glycol diacrylate, polypropylene glycol diacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, glycerol triacrylate and the above.

4. The UV tackified glue of claim 1, wherein, The monofunctional UV light curing monomer is at least one of 2-phenoxyethyl acrylate, ethoxyethoxyethyl acrylate, tetrahydrofurfuryl acrylate, lauryl acrylate, isodecyl acrylate, isononyl acrylate, methoxy polyethylene glycol (350) methyl methacrylate monomer and the above.

5. The UV tackified glue of claim 1, wherein, The photoinitiator is at least one of 1-hydroxycyclohexyl phenyl ketone, 2,4,6-trimethylbenzoyldiphenyl phosphine oxide, 2,4,6-trimethylbenzoyl phenyl ethyl phosphonate, phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone and 2-dimethylamino-2-benzyl-1-(4-piperidinophenyl)-1-butanone free radical type photoinitiator and the above.

6. The UV tackified glue of claim 1, wherein, It also includes a stabilizer, which is a phenolic compound or a quinone compound, and the stabilizer is a mixture of one or several of 4-methoxyphenol, 4-methoxynaphthol, tertiary butyl hydroquinone, dibutyl hydroxytoluene, benzoquinone and 1,4-naphthoquinone.

7. A UV tackified adhesive according to claim 6, wherein by weight, comprising 30-50 parts of acrylic modified polyester resin, 5-30 parts of monofunctional UV light curing monomer, 5-30 parts of multifunctional light curing compound, 0.2-1.5 parts of curing agent, 0.5-2 parts of photoinitiator and 0.01-0.1 parts of stabilizer.

8. The UV tackified glue of claim 1, wherein, The curing agent is a polyisocyanate curing agent or a carboxyl crosslinking agent capable of reacting with hydroxyl or carboxyl groups; The polyisocyanate curing agent is a compound containing two or more isocyanate groups in one molecule, which is one of aromatic polyisocyanate or aliphatic polyisocyanate; The carboxyl crosslinking agent is one or more of multifunctional aziridine and tetrafunctional epoxy resin.

9. A UV-tackified adhesive tape, characterized in that It comprises a substrate layer, a UV tackifying adhesive layer and a release film layer, wherein the UV tackifying adhesive layer is prepared by coating the UV tackifying adhesive according to any one of claims 1-8 on the surface of the substrate layer, and the release film layer is attached to the side of the UV tackifying adhesive layer away from the substrate layer. The thickness of the release film layer is 25-100 μm, the release film layer is a silicone release film or a non-silicone release film; the thickness of the UV tackifying adhesive layer is 5 μm-100 μm; the substrate layer is one of PET, PO / PP / PE, PI or PEN, and the thickness of the substrate layer is 5 μm-300 μm.

10. A method of preparing a UV-tackified adhesive tape, characterized by: It comprises the following steps: (1) adding acrylic modified polyester resin and light curing composition to an organic solvent, stirring uniformly to obtain a mixed solution, adding curing agent, photoinitiator and stabilizer to the organic solvent and adding to the above mixed solution, stirring uniformly to obtain UV tackifying adhesive; (2) coating the UV tackifying adhesive obtained in step (1) on the surface of the substrate, drying and curing at 50-130 °C for 3-5 min and attaching the release film, aging at 40-50 °C for 48-72 h to obtain the UV tackifying adhesive tape; In step (1), the organic solvent is one or more of ethyl acetate, toluene, acetone, butanone and isopropyl alcohol mixed in any proportion.

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