A preparation method of light-curing waterborne polyurethane acrylate adhesive

Abstract

The invention discloses a method for preparing a photocurable waterborne polyurethane acrylate adhesive, the preparation process of which includes: firstly reacting polyester polyol or polyether polyol, terminal hydroxyl polysiloxane and diisocyanate, then adding a hydrophilic chain extender to carry out a chain extension reaction, and using an acrylate double bond end-capping agent to end-cap, then adding a neutralizing agent, adding deionized water for high-speed shear dispersion after the reaction is completed to obtain a waterborne polyurethane acrylate emulsion, and finally adding auxiliary agents such as a defoamer, a thickener, a curing agent, an acrylate monomer and a photoinitiator to obtain the photocurable waterborne polyurethane acrylate adhesive. The invention introduces a small amount of terminal hydroxyl polysiloxane into the main chain of the waterborne polyurethane, which effectively improves the heat resistance and hydrolysis resistance of the photocurable waterborne polyurethane acrylate adhesive. The photocurable waterborne polyurethane acrylate adhesive of the invention has a simple preparation process, excellent comprehensive performance, safety and non-toxicity, relatively low cost, and broad application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of adhesives, and in particular relates to a method for preparing a light-curing waterborne polyurethane acrylate adhesive. Background Art

[0002] Polyurethane adhesives can be divided into solvent-based, solvent-free and water-based polyurethane adhesives according to different use systems. Among them, solvent-based polyurethane adhesives contain volatile organic solvents that are flammable, explosive and toxic, which will cause environmental pollution when used and are more harmful. UV-curable water-based polyurethane acrylate combines the characteristics of light-curing system and water-based system. Due to its significant advantages such as low volatile organic compound emissions, fast curing speed, low system viscosity, and easy cleaning of production equipment, it has gradually attracted people's attention.

[0003] At present, waterborne polyurethane acrylates have disadvantages such as low solid content, poor hydrolysis resistance, and poor heat resistance. The main chain structure of polysiloxane is composed of repeated Si-O-Si bonds, and organic groups are connected to Si atoms as side groups. Many excellent properties of polysiloxane are attributed to this unique chemical structure, such as excellent flexibility, heat resistance, hydrophobicity, and low surface tension. Introducing polysiloxane into waterborne polyurethane acrylate is expected to improve the water resistance and heat resistance of waterborne polyurethane acrylate. However, polysiloxane itself has high hydrophobicity and low viscosity, and there are problems such as poor compatibility with waterborne polyurethane acrylate and excessive use will reduce the bonding strength of the adhesive. Therefore, how to effectively introduce polysiloxane into waterborne polyurethane acrylate and give full play to its role still needs in-depth exploration. Summary of the invention

[0004] The present invention solves the problems existing in the above-mentioned prior art and provides a method for preparing a photocurable waterborne polyurethane acrylate adhesive. The present invention first introduces a small amount of terminal hydroxyl polysiloxane into the polyurethane main chain through copolymerization to prepare a storage-stable organosilicon-modified waterborne polyurethane acrylate emulsion, and then mixes the emulsion with a photoinitiator, an acrylate monomer and other additives to prepare a photocurable waterborne polyurethane acrylate adhesive, which effectively improves the heat resistance and hydrolysis resistance of the waterborne polyurethane adhesive and ensures the bonding strength.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A method for preparing a light-curable waterborne polyurethane acrylate adhesive comprises the following steps:

[0007] (1) 77-79 parts by weight of polyester polyol or polyether polyol and 1-3 parts by weight of terminal hydroxyl polysiloxane are dehydrated at 100-120° C. and added to a reactor, and 20-22 parts by weight of diisocyanate and 0.01-0.02 parts by weight of an organic metal catalyst are added, and the mixture is reacted at 70-85° C. for 2-4 hours; then 4-6 parts by weight of a hydrophilic chain extender is added, and the mixture is subjected to a chain extension reaction at 60-70° C. for 2-3 hours; then 5-7 parts by weight of an acrylate double bond capping agent and 0.01-0.02 parts by weight of a polymerization inhibitor are added, and the mixture is reacted at 60-70° C. for 2-3 hours; finally, 3-4 parts by weight of a neutralizing agent are added to obtain an organosilicon-modified polyurethane acrylate prepolymer;

[0008] (2) adding 120-200 parts by weight of deionized water to 120-150 parts by weight of the silicone-modified polyurethane acrylate prepolymer obtained in step (1), and dispersing the prepolymer under high-speed shearing at 20-30° C. for 0.5-1 hour to obtain an aqueous polyurethane acrylate emulsion having a solid content of 30-50 wt %;

[0009] (3) 0.01-0.1 parts by weight of a defoamer, 0.01-0.2 parts by weight of a thickener, and 0.1-1 parts by weight of a curing agent are added to 40 parts by weight of an aqueous polyurethane acrylate emulsion, and the mixture is uniformly mixed by high-speed shearing to obtain the aqueous polyurethane acrylate adhesive.

[0010] (4) 0.01-0.1 parts by weight of a defoamer, 0.01-0.2 parts by weight of a thickener, 0.1-1 parts by weight of a curing agent, 20 parts by weight of an acrylate monomer, and 0.2-0.4 parts by weight of a photoinitiator are added to 40 parts by weight of an aqueous polyurethane acrylate emulsion, and the mixture is uniformly mixed by high-speed shearing to obtain the photocurable aqueous polyurethane acrylate adhesive.

[0011] Step (3) and step (4) are parallel technical solutions.

[0012] The polyester polyol in step (1) is any one or more of polycaprolactone polyol, polycarbonate polyol and polyadipate polyol, and the polyether polyol is any one or more of polytetrahydrofuran polyol and propylene oxide polyether polyol, preferably polycaprolactone polyol.

[0013] The terminal hydroxyl polysiloxane in step (1) is any one or more of terminal hydroxyl polydimethylsiloxane and terminal hydroxypropyl polysiloxane, preferably terminal hydroxypropyl polysiloxane.

[0014] The diisocyanate in step (1) is any one or more of isophorone diisocyanate, hexamethylene diisocyanate, toluene diisocyanate, and 4,4-dicyclohexylmethane diisocyanate, preferably a combination of isophorone diisocyanate and 4,4'-dicyclohexylmethane diisocyanate, and the molar ratio thereof is preferably 1:1.

[0015] The organic metal catalyst in step (1) is any one or more of an organic tin catalyst and an organic bismuth catalyst, such as dibutyltin dilaurate, stannous octoate, bismuth neodecanoate, preferably dibutyltin dilaurate.

[0016] The hydrophilic chain extender in step (1) is any one or more of 2,2-dimethylolpropionic acid and 2,2-dimethylolbutanoic acid, preferably 2,2-dimethylolpropionic acid.

[0017] The end-capping agent in step (1) is any one or more of hydroxyethyl acrylate, hydroxyethyl methacrylate, and pentaerythritol triacrylate, preferably hydroxyethyl methacrylate.

[0018] In step (1), the inhibitor is hydroquinone and the neutralizer is triethylamine.

[0019] The acrylate monomer in step (4) is any one or more of methyl methacrylate, ethylene glycol dimethacrylate, tripropylene glycol diacrylate, and trimethylolpropane triacrylate, preferably a combination of tripropylene glycol diacrylate and trimethylolpropane triacrylate, and the mass ratio thereof is preferably 7:3.

[0020] The photoinitiator in step (4) is any one or more of diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, 2-hydroxy-2-methyl-1-phenyl-1-propanone, and 1-hydroxycyclohexyl phenyl ketone, preferably diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide.

[0021] The photocurable waterborne polyurethane acrylate adhesive provided by the present invention introduces a small amount of terminal hydroxyl polysiloxane into the polyurethane main chain by reacting with diisocyanate. Due to the organosilicon structure and high bond energy of the terminal hydroxyl polysiloxane, the product has better water resistance and heat resistance. At the same time, the acrylate monomer and photoinitiator in the adhesive react and crosslink with the waterborne polyurethane acrylate rapidly under the irradiation of ultraviolet light, thereby improving the curing rate and bonding strength of the waterborne polyurethane acrylate adhesive.

[0022] Compared with the existing technology, the beneficial effects of the preparation method of the present invention are:

[0023] (1) In the present invention, a small amount of terminal hydroxyl polysiloxane is reacted with isocyanate as a polyol soft segment to prepare a waterborne polyurethane acrylate emulsion with good stability and high solid content.

[0024] (2) The present invention introduces an organosilicon structure into the polyurethane main chain through terminal hydroxyl polysiloxane. A small amount of terminal hydroxyl polysiloxane segments can promote the microscopic phase separation of the hard segment and the soft segment to a certain extent, and the hydrogen bond force between the hard segments is stronger, so that the cohesive energy of WPUA is improved, and the bonding performance of the adhesive is improved to a certain extent; the hydrophobicity and high Si-O-Si bond energy of the organosilicon structure are utilized to improve the water resistance and thermal stability of the waterborne polyurethane acrylate.

[0025] (3) The present invention prepares a photocurable waterborne polyurethane acrylate adhesive by selecting an acrylate monomer and a photoinitiator. Under ultraviolet irradiation, the polyurethane acrylate and the acrylate monomer react rapidly to crosslink and cure, thereby improving the bonding performance of the adhesive.

[0026] (4) The photocurable waterborne polyurethane acrylate adhesive of the present invention has a simple preparation process, excellent comprehensive performance, safety and non-toxicity, relatively low cost, and broad application prospects. DETAILED DESCRIPTION

[0027] In order to make the contents of the present invention easier to understand, the technical solution of the present invention is further described below in conjunction with specific implementation methods, but the present invention is not limited thereto.

[0028] Example 1

[0029] In the first step, 78 g of polycaprolactone diol and 2 g of terminal hydroxypropyl polysiloxane were dehydrated at 115°C and added to the reactor, and then 11.12 g of isophorone diisocyanate, 13.12 g of 4,4'-dicyclohexylmethane diisocyanate and 0.02 g of dibutyltin dilaurate were added to the reactor and reacted at 80°C for 3 h; then 3.65 g of 2,2-dihydroxymethylpropionic acid was added and the chain extension reaction was carried out at 70°C for 2 h; then 6.51 g of hydroxyethyl methacrylate and 0.02 g of hydroquinone were added and reacted at 70°C for 2 h; finally, 2.86 g of triethylamine was added and reacted at 50°C for 1 h to obtain a polyurethane acrylate prepolymer;

[0030] In the second step, deionized water was added to 120 g of polyurethane acrylate prepolymer, and high-speed shear dispersion was performed at 25° C. for 0.5 hour until the phase transition was complete, and 200 g of deionized water was required to obtain an aqueous polyurethane acrylate emulsion;

[0031] The third step is to add 0.01 g of defoamer, 0.03 g of thickener and 0.6 g of curing agent into 40 g of aqueous polyurethane acrylate emulsion and stir at high speed to mix evenly to prepare aqueous polyurethane acrylate adhesive;

[0032] In the fourth step, 0.2 g of photoinitiator, 11 g of tripropylene glycol diacrylate and 5 g of trimethylolpropane triacrylate were added to 40 g of waterborne polyurethane acrylate adhesive and stirred at high speed to mix evenly to prepare a light-curable waterborne polyurethane acrylate adhesive.

[0033] Comparative Example 1 (without addition of hydroxyl-terminated polysiloxane)

[0034] In the first step, 80 g of polycaprolactone diol was dehydrated at 115°C and then added to the reactor, and then 11.12 g of isophorone diisocyanate, 13.12 g of 4,4'-dicyclohexylmethane diisocyanate and 0.02 g of dibutyltin dilaurate were added to the reactor and reacted at 80°C for 3 h; then 3.65 g of 2,2-dihydroxymethylpropionic acid was added and the chain extension reaction was carried out at 70°C for 2 h; then 6.51 g of hydroxyethyl methacrylate and 0.02 g of hydroquinone were added and reacted at 70°C for 2 h; finally, 2.86 g of triethylamine was added and reacted at 50°C for 1 h to obtain a polyurethane acrylate prepolymer;

[0035] In the second step, deionized water is added to 120 g of polyurethane acrylate prepolymer, and high-speed shear dispersion is performed at 25° C. for 0.5 hour until 120 g of deionized water is required for complete phase transition, thereby obtaining an aqueous polyurethane acrylate emulsion;

[0036] The third step is to add 0.01 g of defoamer, 0.03 g of thickener and 0.6 g of curing agent into 40 g of aqueous polyurethane acrylate emulsion and stir at high speed to mix evenly to prepare aqueous polyurethane acrylate adhesive;

[0037] In the fourth step, 0.2 g of photoinitiator, 11 g of tripropylene glycol diacrylate and 5 g of trimethylolpropane triacrylate were added to 40 g of waterborne polyurethane acrylate adhesive and stirred at high speed to mix evenly to prepare a light-curable waterborne polyurethane acrylate adhesive.

[0038] Comparative Example 2

[0039] The first step is to prepare a polyurethane acrylate prepolymer according to step 1 of Example 1;

[0040] The second step is to prepare an aqueous polyurethane acrylate emulsion according to step 2 of Example 1;

[0041] The third step is to prepare a water-based polyurethane acrylate adhesive according to step 3 of Example 1;

[0042] In the fourth step, 0.2 g of photoinitiator, 11 g of n-butyl acrylate and 5 g of tripropylene glycol diacrylate were added to 40 g of waterborne polyurethane acrylate adhesive and stirred at high speed to mix evenly to prepare a light-curable waterborne polyurethane acrylate adhesive.

[0043] Example 2

[0044] In the first step, 78 g of polytetrahydrofuran diol and 2 g of terminal hydroxypropyl polysiloxane were dehydrated at 115°C and added to the reactor, and then 11.12 g of isophorone diisocyanate, 13.12 g of 4,4'-dicyclohexylmethane diisocyanate and 0.02 g of dibutyltin dilaurate were added to the reactor and reacted at 80°C for 3 h; then 3.65 g of 2,2-dihydroxymethylpropionic acid was added and the chain extension reaction was carried out at 70°C for 2 h; then 6.51 g of hydroxyethyl methacrylate and 0.02 g of hydroquinone were added and reacted at 70°C for 2 h; finally, 2.86 g of triethylamine was added and reacted at 50°C for 1 h to obtain a polyurethane acrylate prepolymer;

[0045] In the second step, deionized water was added to 120 g of polyurethane acrylate prepolymer, and high-speed shear dispersion was performed at 25° C. for 0.5 hour until 160 g of deionized water was required for complete phase inversion, thereby obtaining an aqueous polyurethane acrylate emulsion;

[0046] The third step is to add 0.01 g of defoamer, 0.03 g of thickener and 0.6 g of curing agent into 40 g of aqueous polyurethane acrylate emulsion and stir at high speed to mix evenly to prepare aqueous polyurethane acrylate adhesive;

[0047] In the fourth step, 0.2 g of photoinitiator, 14 g of tripropylene glycol diacrylate and 6 g of trimethylolpropane triacrylate were added to 40 g of waterborne polyurethane acrylate adhesive and stirred at high speed to mix evenly to prepare a light-curable waterborne polyurethane acrylate adhesive.

[0048] Example 3

[0049] In the first step, 79.2 g of polycaprolactone diol and 0.8 g of terminal hydroxypropyl polysiloxane were dehydrated at 115°C and added to the reactor, and then 11.12 g of isophorone diisocyanate, 13.12 g of 4,4'-dicyclohexylmethane diisocyanate and 0.02 g of dibutyltin dilaurate were added to the reactor and reacted at 80°C for 3 h; then 3.65 g of 2,2-dihydroxymethylpropionic acid was added and the chain extension reaction was carried out at 70°C for 2 h; then 6.51 g of hydroxyethyl methacrylate and 0.02 g of hydroquinone were added and reacted at 70°C for 2 h; finally, 2.86 g of triethylamine was added and reacted at 50°C for 1 h to obtain a polyurethane acrylate prepolymer;

[0050] In the second step, deionized water was added to 120 g of polyurethane acrylate prepolymer, and high-speed shear dispersion was performed at 25° C. for 0.5 hour until 180 g of deionized water was required for complete phase transition, thereby obtaining an aqueous polyurethane acrylate emulsion;

[0051] The third step is to add 0.01 g of defoamer, 0.03 g of thickener and 0.6 g of curing agent into 40 g of aqueous polyurethane acrylate emulsion and stir at high speed to mix evenly to prepare aqueous polyurethane acrylate adhesive;

[0052] In the fourth step, 0.2 g of photoinitiator, 14 g of tripropylene glycol diacrylate and 6 g of trimethylolpropane triacrylate were added to 40 g of waterborne polyurethane acrylate adhesive and stirred at high speed to mix evenly to prepare a light-curable waterborne polyurethane acrylate adhesive.

[0053] Example 4

[0054] In the first step, 72 g of polycaprolactone diol and 8 g of terminal hydroxypropyl polysiloxane were dehydrated at 115°C and added to the reactor, and then 11.12 g of isophorone diisocyanate, 13.12 g of 4,4'-dicyclohexylmethane diisocyanate and 0.02 g of dibutyltin dilaurate were added to the reactor and reacted at 80°C for 3 h; then 3.65 g of 2,2-dihydroxymethylpropionic acid was added and the chain extension reaction was carried out at 70°C for 2 h; then 6.51 g of hydroxyethyl methacrylate and 0.02 g of hydroquinone were added and reacted at 70°C for 2 h; finally, 2.86 g of triethylamine was added and reacted at 50°C for 1 h to obtain a polyurethane acrylate prepolymer;

[0055] In the second step, deionized water was added to 120 g of polyurethane acrylate prepolymer, and high-speed shear dispersion was performed at 25° C. for 0.5 hour until the phase transition was complete, and 200 g of deionized water was required to obtain an aqueous polyurethane acrylate emulsion;

[0056] The third step is to add 0.01 g of defoamer, 0.03 g of thickener and 0.6 g of curing agent into 40 g of aqueous polyurethane acrylate emulsion and stir at high speed to mix evenly to prepare aqueous polyurethane acrylate adhesive;

[0057] In the fourth step, 0.2 g of photoinitiator, 11 g of tripropylene glycol diacrylate and 5 g of trimethylolpropane triacrylate were added to 40 g of waterborne polyurethane acrylate adhesive and stirred at high speed to mix evenly to prepare a light-curable waterborne polyurethane acrylate adhesive.

[0058] Example 5

[0059] In the first step, 78 g of polybutylene adipate diol and 2 g of terminal hydroxypropyl polysiloxane were dehydrated at 115°C and added to the reactor, and then 11.12 g of isophorone diisocyanate, 13.12 g of 4,4'-dicyclohexylmethane diisocyanate and 0.02 g of dibutyltin dilaurate were added to the reactor and reacted at 80°C for 3 h; then 3.65 g of 2,2-dihydroxymethylpropionic acid was added and the chain extension reaction was carried out at 70°C for 2 h; then 14.91 g of pentaerythritol triacrylate and 0.02 g of hydroquinone were added and reacted at 70°C for 2 h; finally, 2.86 g of triethylamine was added and reacted at 50°C for 1 h to obtain a polyurethane acrylate prepolymer;

[0060] In the second step, deionized water was added to 120 g of polyurethane acrylate prepolymer, and high-speed shear dispersion was performed at 25° C. for 0.5 hour until 160 g of deionized water was required for complete phase inversion, thereby obtaining an aqueous polyurethane acrylate emulsion;

[0061] The third step is to add 0.01 g of defoamer, 0.03 g of thickener and 0.6 g of curing agent into 40 g of aqueous polyurethane acrylate emulsion and stir at high speed to mix evenly to prepare aqueous polyurethane acrylate adhesive;

[0062] In the fourth step, 0.2 g of photoinitiator, 11 g of tripropylene glycol diacrylate and 5 g of trimethylolpropane triacrylate were added to 40 g of waterborne polyurethane acrylate adhesive and stirred at high speed to mix evenly to prepare a light-curable waterborne polyurethane acrylate adhesive.

[0063] Performance Testing

[0064] The solid content of the aqueous polyurethane acrylate emulsion of the present invention is determined by the phase transition state. The test methods for the storage stability of the emulsion, the water absorption rate of the film, the bonding performance of the adhesive and the hydrolysis resistance are as follows.

[0065] 1. Storage stability: According to GB / T 6753.3-1986, if the water-based polyurethane acrylate emulsion is centrifuged at 3000 rpm for 15 min and no flocculation or precipitation occurs, it is considered that the emulsion can be stably stored for more than 6 months.

[0066] 2. Water absorption rate of film: Soak the film formed by water-based polyurethane acrylate emulsion in deionized water at 25°C for 72 h, and calculate the water absorption rate of the film.

[0067] 3. Adhesive bonding performance: According to GB / T 7124-2008 standard, the tensile shear strength of PET sheet / adhesive / PET sheet is used to evaluate the adhesive bonding performance.

[0068] 4. Hydrolysis resistance of adhesive: The prepared adhesive sample joints were placed in a constant temperature and humidity chamber for wet heat treatment. First, the temperature was adjusted at 23°C and relative humidity of 50% for 48 h. Then, the sample was placed in a constant temperature and humidity chamber at 70°C and relative humidity of 95% for 24 h and then taken out. Finally, the sample was adjusted at 23°C and relative humidity of 50% for 24 h. Then, the tensile shear test was performed according to GB / T 7124-2008 to evaluate the hydrolysis resistance of the waterborne polyurethane adhesive.

[0069] Table 1 Performance comparison of waterborne polyurethane acrylate

[0070]

[0071] The performance comparison of Example 1 and Comparative Examples 1 and 2 is listed in Table 1. Comparative Example 1 does not introduce terminal hydroxyl polysiloxane, while Example 1 adds a small amount of terminal hydroxyl polysiloxane. As can be seen from Table 1, the bonding strength of the (photocurable) waterborne polyurethane acrylate adhesive prepared in Example 1 is significantly better than that in Comparative Example 1, because the organosilicon structure in the polyurethane main chain of Example 1 reduces the surface energy of the adhesive and can effectively wet the PET substrate. The film of Example 1 has low water absorption and good hydrolysis resistance, which are significantly better than those of Comparative Example 1, which is attributed to the hydrophobicity of the organosilicon structure and the higher bond energy of Si-O-Si.

[0072] The process of preparing the waterborne polyurethane acrylate adhesive in Comparative Example 2 is the same as that in Example 1, except that when preparing the light-cured waterborne polyurethane acrylate adhesive, the acrylate monomer combination used in Example 1 is tripropylene glycol diacrylate and trimethylolpropane triacrylate, while the acrylate monomer combination used in Comparative Example 2 is n-butyl acrylate and tripropylene glycol diacrylate. As can be seen from Table 1, the bonding strength and hydrolysis resistance of the light-cured waterborne polyurethane acrylate adhesive prepared in Example 1 are better than those in Comparative Example 2. This is mainly because n-butyl acrylate is a monofunctional flexible monomer, while trimethylolpropane triacrylate is a trifunctional cross-linking monomer, which makes the adhesive have a deeper degree of cross-linking after light curing and improves the bonding strength.

[0073] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A method for preparing a light-curable waterborne polyurethane acrylate adhesive, characterized in that: The following steps are involved: In the first step, 78 g of polycaprolactone diol and 2 g of terminal hydroxypropyl polysiloxane were dehydrated at 115°C and added to the reactor, and then 11.12 g of isophorone diisocyanate, 13.12 g of 4,4'-dicyclohexylmethane diisocyanate and 0.02 g of dibutyltin dilaurate were added to the reactor and reacted at 80°C for 3 h; then 3.65 g of 2,2-dihydroxymethylpropionic acid was added and the chain extension reaction was carried out at 70°C for 2 h; then 6.51 g of hydroxyethyl methacrylate and 0.02 g of hydroquinone were added and reacted at 70°C for 2 h; finally, 2.86 g of triethylamine was added and reacted at 50°C for 1 h to obtain a polyurethane acrylate prepolymer; In the second step, deionized water was added to 120 g of polyurethane acrylate prepolymer, and high-speed shear dispersion was performed at 25° C. for 0.5 hour until the phase transition was complete, and 200 g of deionized water was required to obtain an aqueous polyurethane acrylate emulsion; The third step is to add 0.01 g of defoamer, 0.03 g of thickener and 0.6 g of curing agent into 40 g of aqueous polyurethane acrylate emulsion and stir at high speed to mix evenly to prepare aqueous polyurethane acrylate adhesive; In the fourth step, 0.2 g of photoinitiator, 11 g of tripropylene glycol diacrylate and 5 g of trimethylolpropane triacrylate were added to 40 g of waterborne polyurethane acrylate adhesive and stirred at high speed to mix evenly to prepare a light-curable waterborne polyurethane acrylate adhesive.

2. The method for preparing the light-curable waterborne polyurethane acrylate adhesive according to claim 1, characterized in that: The photoinitiator is any one or more of diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, 2-hydroxy-2-methyl-1-phenyl-1-propanone, and 1-hydroxycyclohexyl phenyl ketone.

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