High-water-oxygen barrier type UV moisture dual-curing three-proofing adhesive and preparation method thereof

Abstract

The invention relates to the technical field of light-cured adhesives, in particular to the field of IPC C09J175, and more particularly relates to a high-water-oxygen-barrier type UV moisture dual-curing three-proofing adhesive and a preparation method of the high-water-oxygen-barrier type UV moisture dual-curing three-proofing adhesive. The invention discloses a high-molecular photoinitiator, which is prepared from the following components in parts by weight: 1 to 6 parts of modified hyperbranched dual-curing resin, 10 to 22 parts of high-molecular polyurethane acrylate, 30 to 60 parts of reactive diluent and 3 to 7 parts of free radical type photoinitiator. The three-proofing adhesive prepared by the invention can form a more compact barrier layer in an adhesive film, the water vapor transmittance and the oxygen transmittance are reduced, the water vapor transmittance of the three-proofing adhesive is lower than 0.5 g.cm <-2 >. Day <-1 > when the relative humidity is 90%, and the oxygen transmittance of the three-proofing adhesive is lower than 0.5 cm < 3 >. Cm <-2 >. Day <-1 > when the relative humidity is 0%.

Description

Technical Field

[0001] The present invention relates to the technical field of light-curing adhesives, in particular to the field of IPC C09J175, and more specifically to a high water-oxygen barrier type UV moisture dual-curing three-proof adhesive and a preparation method thereof. Background Art

[0002] As electronic products gradually turn to miniaturization, integration, and multifunctionality, the electronic assembly industry is also developing rapidly, and the requirements for the safety performance and reliability of assembled products are becoming higher and higher, especially for printed circuit boards. As electronic devices are increasingly used in daily life, consumers are now paying more and more attention to the quality and reliability of products. "Three-proof (moisture-proof, salt spray-proof, anti-static)" is mentioned and valued by more and more manufacturers. However, traditional three-proof adhesives have problems such as high volatile organic compounds (VOCs) content and incomplete UV curing. UV moisture dual curing technology combines the advantages of UV curing rapidity and moisture curing extensiveness, and can effectively solve the above problems. However, the water and oxygen barrier performance of UV moisture dual curing three-proof adhesives in the prior art still needs to be improved.

[0003] Chinese invention patent CN117801733A discloses a UV moisture low surface energy three-proof adhesive, which includes the following raw materials: UV moisture-curable polyurethane modified acrylate prepolymer, reactive diluent, silane coupling agent, photoinitiator, leveling agent and defoaming agent. A self-made low NCO content UV moisture dual-curing polyurethane modified acrylate prepolymer is used, and a low surface energy reactive diluent, a silicone or organic fluorine leveling agent, and a silicone or polyether defoaming agent are added to prepare a low surface energy UV moisture three-proof adhesive. The water drop angle is 27-29 degrees. It not only has good wettability, but also has good defoaming function. The coating has good flatness and smoothness, and has better waterproof, oil-proof and chemical corrosion resistance. However, the research on oxygen barrier performance is not involved. Summary of the invention

[0004] The first aspect of the present invention provides a high water and oxygen barrier type UV moisture dual-curing three-proof adhesive, which comprises, by weight, 1 to 5 parts of a modified hyperbranched dual-curing resin, 10 to 20 parts of a high molecular weight polyurethane acrylate, 30 to 60 parts of an active diluent, and 3 to 7 parts of a free radical photoinitiator. The three-proof adhesive has a water vapor transmission rate (ASTM F1249, using a WTR-T3 water vapor transmission rate tester) of less than 0.5 g·cm at a relative humidity of 90%. -2 ·day -1 , at a relative humidity of 0%, the oxygen transmission rate (ASTM D3985, using a coulometric oxygen transmission rate tester) is less than 0.5 cm 3 cm -2 ·day -1.

[0005] Preferably, the water vapor transmission rate of the three-proof adhesive is less than 0.25g·cm at a relative humidity of 90%. -2 ·day -1 , the oxygen transmission rate is less than 0.2cm at relative humidity 0% 3 cm -2 ·day -1 .

[0006] The photoinitiator includes at least one of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexyl phenyl ketone, diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide, 2-isopropylthioxanthone, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, methyl benzoylformate, 2,2-diethoxyacetophenone, p-phenoxy-α,α-dichloroacetophenone, 1-hydroxy-cyclohexyl-phenyl ketone, ethyl 2,4,6-trimethylbenzoylphosphonate, α,α-dimethyl-α-hydroxyacetophenone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, and 2-isopropylthioxanthone.

[0007] Preferably, the free radical photoinitiator comprises 1-hydroxycyclohexyl phenyl ketone and 2-isopropylthioxanthone, and the weight ratio of the 1-hydroxycyclohexyl phenyl ketone to the 2-isopropylthioxanthone is (1-3):(1-6).

[0008] More preferably, the weight ratio of 1-hydroxycyclohexyl phenyl ketone to 2-isopropylthioxanthone is (1-3):(1-4).

[0009] The active diluent includes at least one of isobornyl acrylate, isobornyl methacrylate, isooctyl acrylate, tetrahydrofuran methacrylate, trimethylolpropane triacrylate, 2-phenoxyethyl acrylate, ethoxylated trimethylolpropane triacrylate, 1,6-hexanediol diacrylate, 1,4-butanediol diacrylate, isodecyl acrylate, lauric acid acrylate, 3,3,5-trimethylcyclohexyl acrylate, 4-tert-butylcyclohexyl acrylate, dicyclopentenyl acrylate, pentaerythritol tetraacrylate, tripropylene glycol diacrylate (TPGDA), dipropylene glycol acrylate (DPGDA), ethoxylated-2-methyl-1,3-propanediol, diacrylate, tetrahydrofuran acrylate (TFMA), 1,6-hexanediol diacrylate (HDDA), propoxylated glycerol triacrylate, isobornyl acrylate (IBOA), isobornyl methacrylate (IBOMA), and ethoxylated trihydroxypropane triacrylate.

[0010] Preferably, the reactive diluent comprises isobornyl methacrylate and pentaerythritol tetraacrylate, and the weight ratio of isobornyl methacrylate to pentaerythritol tetraacrylate is 1:(0.2-3).

[0011] More preferably, the weight ratio of isobornyl methacrylate to pentaerythritol tetraacrylate is (3-6):(2-8).

[0012] The polymer polyurethane acrylate includes a free radical polymerizable compound.

[0013] The above-mentioned free radical polymerizable compound can be any free radical polymerizable compound as long as it is photopolymerizable, and is not particularly limited as long as it is a compound having a free radical polymerizable group in the molecule. Preferably, it is a compound having an unsaturated double bond as the free radical polymerizable group, and particularly preferably, from the perspective of reactivity, a compound having an amino (meth) acryloyl group (hereinafter also referred to as an "amino (meth) acrylic compound").

[0014] As the above-mentioned (meth) acrylic acid compound, there can be used carbamate (meth) acrylate obtained by reacting an isocyanate compound with a (meth) acrylic acid derivative having an acrylic double bond. It should be noted that in this specification, the above-mentioned "amino (meth) acrylate" refers to amino acrylate or amino methacrylate. In addition, the isocyanate groups of the isocyanate compound that is the raw material of the above-mentioned carbamate (meth) acrylate are all used to form carbamate bonds, and the above-mentioned carbamate (meth) acrylate does not have residual isocyanate groups.

[0015] The raw materials of the urethane (meth)acrylate include (meth)acrylic acid derivatives having acrylic double bonds, for example, mono(meth)acrylates of diols such as ethylene glycol, propylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, polyethylene glycol, etc., mono(meth)acrylates or di(meth)acrylates of triols such as trimethylolethane, trimethylolpropane, glycerol, etc., epoxy(meth)acrylates such as bisphenol A epoxy(meth)acrylate, etc.

[0016] The modified hyperbranched dual-curing resin is polyurethane acrylate containing isocyanate groups and acrylic acid double bonds.

[0017] The raw materials for preparing the modified hyperbranched dual-curing resin include hyperbranched polyester, diisocyanate and hydroxy acrylate.

[0018] The hyperbranched polyester comprises hyperbranched polyurethane acrylate, wherein the hyperbranched polyurethane acrylate is composed of an ester group and a hydrocarbon group, and the terminal functional groups comprise a hydroxyl group and a carboxyl group.

[0019] The hydroxy acrylates include hydroxyethyl acrylate, 2- / 3-hydroxypropyl acrylate, hydroxybutyl acrylate, 2- / 3- / 4-hydroxyethyl methacrylate, 2- / 3-hydroxypropyl methacrylate, 2- / 3- / 4-hydroxybutyl methacrylate

[0020] Preferably, the hydroxy acrylate includes at least one of hydroxybutyl acrylate.

[0021] Examples of the monofunctional ester compounds in the ester compounds include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, isobutyl (meth)acrylate, tert-butyl (meth)acrylate, isooctyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, isobornyl (meth)acrylate, cyclohexyl (meth)acrylate, 2-methoxybutyl (meth)acrylate, ethyl acrylate, methoxyethylene glycol (meth)acrylate, 2-ethoxyethyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, benzyl (meth)acrylate, ethyl carbitol (meth)acrylate, phenoxyethyl (meth)acrylate, phenoxydiethylene glycol (meth)acrylate, phenoxypolyethylene glycol (meth)acrylate, methoxypolyethylene glycol (meth)acrylate, 2,2,2-trifluoroethyl (meth)acrylate, 2,2,3,3-tetrafluoropropyl (meth)acrylate Esters, imide (meth)acrylate, methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, propyl (meth)acrylate, cyclohexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isononyl (meth)acrylate, isomyristyl (meth)acrylate, 2-butoxyethyl (meth)acrylate, 2-phenoxyethyl (meth)acrylate, dicyclopentenyl (meth)acrylate, isodecyl (meth)acrylate, At least one of phthalimide acrylates such as diethylaminoethyl (meth)acrylate, dimethylaminoethyl (meth)acrylate, 2-(meth)acryloyloxyethylsuccinic acid, 2-(meth)acryloyloxyethylhexahydrophthalic acid, 2-(meth)acryloyloxyethyl 2-hydroxypropyl phthalate, glycidyl (meth)acrylate, 2-(meth)acryloyloxyethyl phosphate, N-acryloyloxyethylhexahydrophthalimide, and various imide acrylates.

[0022] The number average molecular weight of the high molecular weight polyurethane acrylate is in the range of 10000 to 50000, and the elongation (GB / T528-2009) is greater than 200%.

[0023] The weight ratio of the modified hyperbranched dual-curing resin to the high molecular weight polyurethane acrylate is (1-5): (10-22).

[0024] Preferably, the weight ratio of the modified hyperbranched dual-cure resin to the high molecular weight polyurethane acrylate is (2-5):(10-20).

[0025] The modified hyperbranched dual-cure resin has a viscosity of less than 500 Pa·s at 25° C.

[0026] The present invention has found in research that the water-oxygen barrier effect can be improved by selecting a viscosity of less than 500 Pa·s at 25°C and a weight ratio of (1-5): (10-22) of the modified hyperbranched dual-cured resin and the high molecular weight polyurethane acrylate. This may be because at this viscosity and content, the mixed viscosity of the formula can be ensured, and the modified hyperbranched dual-cured resin can be evenly distributed in the polymer matrix to form a complex network structure, improve the material density, enhance the water-oxygen barrier ability, and form a continuous and dense barrier layer, thereby effectively preventing the penetration of water and oxygen. Too little content of the modified hyperbranched dual-cured resin will result in insufficient water-oxygen barrier ability of the three-proof glue, while too much content of the modified hyperbranched dual-cured resin will result in defects such as phase separation and agglomeration inside the material, which will reduce the barrier effect.

[0027] The present invention has found in the research that not all polymer polyurethane acrylates have excellent effects. Only polymer polyurethane acrylates with an elongation of more than 200% and a molecular weight of 10,000 to 50,000 can achieve the effect of increasing the molecular chain length and crosslinking density of the three-proof adhesive. The elongation of the polymer polyurethane acrylate exceeds 200%. When subjected to external force, the prepared three-proof adhesive can undergo a large deformation and is not easy to break. When the coating is subjected to external factors such as temperature changes and mechanical stress, it can maintain good integrity and sealing, and can effectively block the penetration of moisture and oxygen. If the weight average molecular weight of the polymer polyurethane acrylate is less than 10,000, the crosslinking density is high and the flexibility is sometimes impaired. If the weight average molecular weight of the above-mentioned polymer polyurethane acrylate exceeds 50,000, the resulting UV moisture dual-curing three-proof adhesive sometimes has poor coating properties.

[0028] The present invention has also conducted corresponding research on other polymer materials and found that although polyvinyl alcohol can be cured by chemical crosslinking and other methods, it has strong hydrophilicity and easily absorbs moisture, and although polyethylene terephthalate (PET) has excellent mechanical properties and chemical stability, it may not fully react with the photoinitiator in the UV moisture dual curing system, resulting in poor curing effect, and the price is relatively high, which will increase production costs. These materials cannot achieve excellent water and oxygen barrier effects.

[0029] The diisocyanate is at least one of toluene diisocyanate, hydrogenated phenylmethane diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, 2,2,4-trimethylhexane diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate.

[0030] The preparation method of the modified hyperbranched dual-cure resin comprises the following steps:

[0031] The hyperbranched polyester is heated at 100-130°C and vacuumed to remove water;

[0032] The hyperbranched polyester after dehydration is cooled to 50-70° C., and diisocyanate is added to react to obtain a mixture;

[0033] Add hydroxy acrylate to the mixture and continue the reaction. When the isocyanate content is 7-9 wt %, stop heating and cool the mixture to obtain a hyperbranched dual-curing resin.

[0034] The molar ratio of the hydroxyl group in the hyperbranched polyester to the isocyanate group in the diisocyanate is 1:(2-2.5).

[0035] Preferably, the molar ratio of the hydroxyl group in the hyperbranched polyester to the isocyanate group in the diisocyanate is 1:(2.2-2.3).

[0036] More preferably, the molar ratio of the hydroxyl group in the hyperbranched polyester to the isocyanate group in the diisocyanate is 1:2.2.

[0037] The molar ratio of the isocyanate groups in the mixture to the hydroxyl groups in the hydroxy acrylate is 1.3:(0.8-1.5).

[0038] Preferably, the molar ratio of the isocyanate groups in the mixture to the hydroxyl groups in the hydroxy acrylate is 1.3:(0.9-1.1).

[0039] Further preferably, the molar ratio of the isocyanate groups in the mixture to the hydroxyl groups in the hydroxy acrylate is 1.3:1.

[0040] The second aspect of the present invention provides a method for preparing a high water and oxygen barrier type UV moisture dual-curing three-proof adhesive, comprising the following steps: uniformly mixing a modified hyperbranched dual-curing resin, a polymer polyurethane acrylate, and an active diluent to obtain a mixture; adding a free radical photoinitiator to the mixture, and continuing to stir until the mixture is uniformly mixed to obtain a UV moisture dual-curing three-proof adhesive.

[0041] Beneficial Effects

[0042] 1. In the present invention, the modified hyperbranched dual-curing resin, high molecular weight polyurethane acrylate, active diluent and free radical photoinitiator are synergistically enhanced with each other. Only when the four act simultaneously can the water and oxygen barrier and cost reduction effects be achieved.

[0043] 2. By limiting the weight ratio of the modified hyperbranched dual-cure resin and the high molecular weight polyurethane acrylate to (1-5):

[0044] (10-22). The water vapor transmission rate of the three-proof adhesive can be lower than 0.5g·cm at a relative humidity of 90%. -2 ·day -1 , the oxygen transmission rate is less than 0.5cm at relative humidity 0% 3 cm -2 ·day -1 .

[0045] 3. By limiting the weight ratio of the modified hyperbranched dual-cure resin and the high molecular weight polyurethane acrylate to (2-5):

[0046] (10-20), which can further reduce the water vapor transmission rate of the three-proof adhesive to less than 0.25g·cm at a relative humidity of 90%. -2 ·day -1 , the oxygen transmission rate is less than 0.2cm at relative humidity 0% 3 cm -2 ·day -1 .

[0047] 4. By selecting the high molecular weight polyurethane acrylate with a number average molecular weight range of 10,000 to 50,000 and an elongation (GB / T 528-2009) greater than 200%, the coating properties and mechanical properties can be further improved while maintaining excellent water vapor barrier properties.

[0048] 5. The film-forming property and adhesion of the three-proof adhesive can be improved through the preparation method of the specific modified hyperbranched dual-curing resin. DETAILED DESCRIPTION

[0049] Examples 1-5

[0050] A high water and oxygen barrier type UV moisture dual-curing three-proof adhesive, the components by weight are shown in Table 1:

[0051] Table 1

[0052]

[0053]

[0054] The raw materials for preparing the modified hyperbranched dual-curing resin are: hyperbranched polyester, diisocyanate (hydrogenated phenylmethane diisocyanate) and hydroxy acrylate (hydroxybutyl acrylate).

[0055] The preparation method of the modified hyperbranched dual-cure resin comprises the following steps: heating the hyperbranched polyester at 110° C. and vacuumizing to remove water until the water content is less than 300 ppm; cooling to 60° C., adding hydrogenated phenylmethane diisocyanate at a molar ratio of NCO:OH=2.2, and reacting for 1.5 hours; stirring continuously during the reaction to ensure uniform reaction; adding hydroxybutyl acrylate at a molar ratio of NCO:OH=1.3, continuing the reaction, monitoring the NCO content, stopping heating when the NCO content is 8wt%, and cooling to obtain the modified hyperbranched dual-cure resin.

[0056] A high water and oxygen barrier type UV moisture dual-curing three-proof adhesive, the preparation method is as follows: as shown in Table 1, firstly, a modified hyperbranched dual-curing resin, a high molecular weight polyurethane acrylate, and a reactive diluent are uniformly mixed, and stirred at 500 rpm at room temperature until uniform to obtain a mixture; under light-proof conditions, a free radical photoinitiator is added to the mixture, and stirring is continued until the mixture is uniform to obtain a UV moisture dual-curing three-proof adhesive.

[0057] Comparative Example 1

[0058] The specific implementation method is the same as Example 1; the difference is that the modified hyperbranched dual-cure resin added in Comparative Example 1 is 7 parts.

[0059] Comparative Example 2

[0060] The specific implementation is the same as Example 2; the difference is that the addition amount of the polymer polyurethane acrylate in Comparative Example 2 is 8 parts.

[0061] Comparative Example 3

[0062] The specific implementation is the same as Example 5; the difference is that the addition amount of the polymer polyurethane acrylate in Comparative Example 3 is 23 parts.

[0063] Performance Testing Methods

[0064] The performance of the three-proof adhesive prepared in the embodiment and the comparative example was tested, and the test data are listed in Table 2.

[0065] Film performance test: Water vapor transmission rate, refer to standard ASTMF1249, use WTR-T3 water vapor transmission rate tester, test conditions, relative humidity 90%; oxygen transmission rate, refer to standard ASTMD3985, use ASTM D3985 coulometric oxygen transmission rate tester, test conditions, relative humidity 0%.

[0066] Performance test data

[0067] Table 2

[0068] <![CDATA[Water vapor transmission rate (g·cm -2 ·day -1 )]]> <![CDATA[Oxygen transmission rate (cm 3 ·cm -2 ·day -1 )]]> Example 1 0.23 0.09 Example 2 0.17 0.14 Example 3 0.18 0.13 Example 4 0.13 0.16 Example 5 0.24 0.19 Comparative Example 1 2.27 1.76 Comparative Example 2 1.56 2.27 Comparative Example 3 1.64 1.87

[0069] It can be seen from the test results in Table 2 that the water vapor permeability of the films obtained in Examples 1 to 5 of the present invention is between 0.25 g·cm -2 ·day -1 Below, oxygen permeability is 0.2cm 3 cm -2 ·day -1 The water vapor permeability of the films obtained in Comparative Examples 1 to 3 is 1.50 g·cm -2 ·day -1 Above, oxygen permeability is 1.75cm 3 cm -2 ·day -1 The above results show that the water and oxygen barrier properties are poor, which indicates that the three-proof adhesive prepared in this application can form a denser barrier layer in the adhesive film and reduce the water vapor transmission rate and oxygen transmission rate.

[0070] The UV moisture dual-curing three-proof adhesive prepared by the method of Comparative Example 1 (compared with Example 1) has a poor water and oxygen barrier effect; because the amount of hyperbranched polyurethane acrylate added is too much, a relatively dense network structure will be formed during the curing process, which will also increase the viscosity of the coating, affecting the fluidity and uniformity of the coating, thereby causing the material to become hard as a whole.

[0071] The UV moisture dual-curing three-proof adhesive prepared by the method of Comparative Example 2 (compared with Example 2) has a poor water and oxygen barrier effect; because the addition amount of high molecular weight polyurethane acrylate is too small, the viscosity of the glue is too low, the formed coating is thin, the coating fluidity is better, the viscosity and adhesion of the glue are reduced, and the water and oxygen barrier effect of the product is affected.

[0072] The UV moisture dual-curing three-proof adhesive prepared by the method of Comparative Example 3 (compared with Example 5) has a poor water and oxygen barrier effect; this is because the addition amount of high molecular weight polyurethane acrylate is too much, which will cause the cross-linking structure of the polycarboxylic acid molecular chain to be too complicated, the coating fluidity is poor, the formed coating is thicker, and the dispersibility will also be affected, resulting in internal agglomeration, stratification and other undesirable phenomena, affecting the water and oxygen barrier effect of the product.

Claims

1. A high water and oxygen barrier type UV moisture dual-curing three-proof adhesive, characterized in that: The components include, by weight: 1 to 6 parts of modified hyperbranched dual-curing resin, 10 to 22 parts of high molecular weight polyurethane acrylate, 30 to 60 parts of active diluent, and 3 to 7 parts of free radical photoinitiator. The water vapor transmission rate of the three-proof adhesive is lower than 0.5 g·cm at a relative humidity of 90%. -2 ·day -1 , the oxygen transmission rate is less than 0.5cm at relative humidity 0% 3 cm -2 ·day -1 .

2. The high water and oxygen barrier type UV moisture dual-curing three-proof adhesive according to claim 1, characterized in that: The modified hyperbranched dual-curing resin is polyurethane acrylate containing isocyanate groups and acrylic acid double bonds.

3. The high water and oxygen barrier type UV moisture dual-curing three-proof adhesive according to claim 2, characterized in that: The raw materials for preparing the modified hyperbranched dual-curing resin include hyperbranched polyester, diisocyanate and hydroxy acrylate.

4. The high water and oxygen barrier type UV moisture dual-curing three-proof adhesive according to claim 3, characterized in that: The number average molecular weight of the polymer polyurethane acrylate is in the range of 10,000 to 50,000, and the elongation of the polymer polyurethane acrylate is greater than 200%.

5. The high water and oxygen barrier type UV moisture dual-curing three-proof adhesive according to claim 4, characterized in that: The weight ratio of the modified hyperbranched dual-cure resin and the high molecular weight polyurethane acrylate is (1-5): (10-22)。 6. The high water and oxygen barrier type UV moisture dual-curing three-proof adhesive according to claim 5, characterized in that: The diisocyanate includes at least one of toluene diisocyanate, hydrogenated phenylmethane diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, 2,2,4-trimethylhexane diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate.

7. The high water and oxygen barrier type UV moisture dual-curing three-proof adhesive according to claim 6, characterized in that: The preparation method of the modified hyperbranched dual-cure resin comprises the following steps: The hyperbranched polyester is heated at 100-130°C and vacuumed to remove water; The hyperbranched polyester after dehydration is cooled to 50-70° C., and diisocyanate is added to react to obtain a mixture; Add hydroxy acrylate to the mixture and continue the reaction. When the isocyanate content is 7-9 wt %, stop heating and cool the mixture to obtain a hyperbranched dual-curing resin.

8. The high water and oxygen barrier type UV moisture dual-curing three-proof adhesive according to claim 7, characterized in that: The molar ratio of the hydroxyl group in the hyperbranched polyester to the isocyanate group in the diisocyanate is 1:(2-2.5).

9. The high water and oxygen barrier type UV moisture dual-curing three-proof adhesive according to claim 8, characterized in that: The molar ratio of the isocyanate groups in the mixture to the hydroxyl groups in the hydroxy acrylate is 1.3:(0.8-1.5).

10. A method for preparing the high water and oxygen barrier type UV moisture dual-curing three-proof adhesive according to any one of claims 1 to 9, characterized in that: The following steps are involved: The modified hyperbranched dual-curing resin, high molecular weight polyurethane acrylate and active diluent are mixed uniformly to obtain a mixture; a free radical photoinitiator is added to the mixture, and stirring is continued until the mixture is uniform to obtain a UV moisture dual-curing three-proof adhesive.

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