Dynamic balance UV adhesive as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of adhesives, and particularly relates to a dynamic balance UV adhesive as well as a preparation method and application thereof. The invention relates to a UV (ultraviolet) coating which comprises the following components in parts by weight: 10-30 parts of acrylic resin containing polyurethane carbon-carbon double bonds, 10-30 parts of acrylate monomer containing carbon-carbon double bonds, 0.2-3 parts of photoinitiator, 40-60 parts of inorganic salt and 0.1-1 part of flatting agent. According to the prepared dynamic balance UV adhesive, carbon-carbon double bonds of an acrylic resin body are subjected to polymerization cross-linking after UV irradiation, through rapid cross-linking with acrylic resin, the density range is 1.5-3.1 g / cm < 3 >, an interpenetrating structure is formed with inorganic salt, the adhesive using amount during dynamic balance of an electronic fan can be reduced, meanwhile, the surface drying time is prolonged (1-3 seconds), and the service life of the electronic fan is prolonged. Therefore, automatic dynamic balance of electronic fan products is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of adhesives, and particularly relates to a dynamic balance UV adhesive and its preparation method and application. Background Art

[0002] The dynamic balance UV adhesive is extruded by a dispensing device. After short-time UV irradiation for 1 - 3 seconds, it has high adhesion, good adhesion, complete curing (depth), good weather resistance, and can be applied with an automatic dispensing machine. Therefore, it is used in the manufacturing process of the dynamic balance process of products such as electronic fans.

[0003] However, at present, the dynamic balance adhesive materials on the market are mainly balance mud, which has the problems of difficult dosage control and inability to complete the dynamic balance of electronic fans on a large scale automatically. Most of the dynamic balance UV adhesives on the market are ordinary acrylate polymer adhesives. Due to limited compatibility in the system and problems such as inorganic salt addition, there are more or less defects in the density, bonding strength, curing depth, weather resistance, and surface drying time of the binder. It is easy to block during the dispensing process of the dispensing device and has a long curing surface drying time, thus unable to meet the large-scale automatic dynamic balance operation of electronic fans. Currently, by controlling the appropriate weight-average molecular weight of the prepared resin, the initial adhesion and cohesion of the adhesive tape are improved; by selecting inorganic salts with appropriate particle sizes, the preparation of a UV adhesive that is easy to apply automatically is realized. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a dynamic balance UV adhesive and its preparation method. The present invention synthesizes a functional acrylic resin with a specific molecular weight distribution, which is mixed with an acrylic monomer, a photoinitiator, a curing crosslinking agent, and an inorganic salt in a certain proportion, and has the characteristics of a UV adhesive density of 1.5 - 3.1 g / cm 3 , high bonding force after UV irradiation, fast surface drying, complete curing, good weather resistance, and no blockage of the dispensing machine needle tip.

[0005] In order to solve the above existing technical problems, the present application provides the following technical solutions: The present invention provides a dynamic balance UV adhesive, which comprises the following components by weight: 10 - 30 parts of a polyurethane carbon-carbon double bond-containing acrylic resin, 10 - 30 parts of a carbon-carbon double bond-containing acrylate monomer, 0.2 - 3 parts of a photoinitiator, 40 - 60 parts of an inorganic salt, and 0.1 - 1 part of a leveling agent; By weight, the reaction raw materials of the polyurethane carbon-carbon double bond-containing acrylic resin comprise the following components: 30 - 85 parts of a monomer, 5 - 15 parts of a functional monomer, 6 - 25 parts of a functional monomer containing an active hydroxyl group, 0.02 - 0.5 parts of an initiator, 0.01 - 0.5 parts of a catalyst, and 5 - 30 parts of an isocyanate; the isocyanate is selected from ethyl isocyanate acrylate; The monomer is selected from one or more of methyl acrylate, butyl acrylate, isooctyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, and morpholine acrylate; the functional monomer is selected from one or more of acrylic acid, methacrylic acid, N-hydroxymethyl acrylamide, glycidyl acrylate, and N,N-dimethyl acrylamide; the functional monomer containing active hydroxyl groups is selected from one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, and hydroxybutyl acrylate.

[0006] Preferably, the preparation method of the polyurethane-containing carbon-carbon double bond acrylate resin is as follows: S21: By weight, in a nitrogen atmosphere, 30-85 parts of monomer, 5-15 parts of functional monomer, and 6-25 parts of functional monomer containing active hydroxyl groups are mixed and heated to 60-70 °C to obtain a mixture; S22: 0.02-0.5 part of initiator is added to the reaction mixture, and the reaction is carried out at 76-90 °C for 2-8 h and then cooled to 40-60 °C to obtain an intermediate product; S23: 0.01-0.5 part of catalyst and 5-30 parts of isocyanate are added to the intermediate product, and the reaction is carried out for 2-6 h to obtain the polyurethane-containing carbon-carbon double bond acrylate resin.

[0007] Furthermore, the structural formula of the polyurethane-containing carbon-carbon double bond acrylate resin is selected from one of the following: , , , , .

[0008] Preferably, among the reaction raw materials of the polyurethane-containing carbon-carbon double bond acrylate resin, the initiator is selected from azobisisobutyronitrile or benzoyl peroxide.

[0009] Preferably, the carbon-carbon double bond-containing acrylate monomer is selected from one or two of acryloylmorpholine and methyl acrylate.

[0010] Furthermore, the mass ratio of acryloylmorpholine to methyl acrylate is 5:7-10.

[0011] Preferably, the weight-average molecular weight of the polyurethane-containing carbon-carbon double bond acrylate resin is 10,000 to 80,000, the glass transition temperature is -50 to -20 °C; the carbon-carbon double bond content is 0.1-3 mmol / g.

[0012] Preferably, the catalyst is selected from one or more of dioctyltin laurate, dibutyltin dilaurate, bismuth chloride, and bismuth oxide; The photoinitiator is selected from one or more of benzil dimethyl ether, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide; the inorganic salt is selected from one or more of barium nitrate, barium titanate, barium sulfate, bismuth nitrate, and bismuth sulfate.

[0013] Preferably, the leveling agent is one or a mixture of Hanbang-Byk BYK-302, Hanbang-Byk BYK-306, and Hanbang-Byk BYK-333.

[0014] The present invention also provides a preparation method of the above dynamic balance UV adhesive, including the following steps: S31: By weight, 10-30 parts of polyurethane carbon-carbon double bond acrylate resin, 10-30 parts of carbon-carbon double bond acrylate monomer, and 0.2-3 parts of photoinitiator are heated to 75-85 °C and mixed for 1-3 h under a nitrogen atmosphere to obtain a mixed resin liquid; S32: After cooling the mixed resin liquid to 45-55 °C, 40-60 parts of inorganic salt and 0.1-1 part of leveling agent are added and stirred for 2-3 h to obtain the dynamic balance UV adhesive; The present invention also provides an application of the above dynamic balance UV adhesive. The surface drying time of the dynamic balance UV adhesive is 1-3 s after being irradiated by ultraviolet light (UV).

[0015] The technical solution of the present invention has the following advantages compared with the prior art: The dynamic balance UV adhesive prepared by the present invention utilizes the carbon-carbon double bond of the acrylic resin body to polymerize and crosslink after UV irradiation. Through rapid crosslinking with the acrylic resin, the density range is 1.5-3.1 g / cm 3 , and an interpenetrating structure is formed with the inorganic salt, which can reduce the amount of adhesive used in the dynamic balance of the electronic fan, and at the same time improve the surface drying time (1-3 seconds), thereby realizing the automatic dynamic balance of electronic fan products. Description of the Drawings

[0016] Figure 1 It is an application diagram of the UV adhesive with a cured density of 2.07 g / cm 3 for the dynamic balance of the electronic fan in Example 2. Detailed Embodiments

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments cited do not limit the present invention.

[0019] Standard sample embodiment 1. Synthesis of polyurethane-containing carbon-carbon double bond acrylic resin 1, which comprises the following steps: (1) Mix 40 parts of isooctyl acrylate, 30 parts of butyl acrylate, 15 parts of methyl methacrylate, 10 parts of 2-hydroxyethyl acrylate, 5 parts of N,N-dimethylacrylamide with 100 parts of ethyl acetate evenly. Under a nitrogen atmosphere, stir and heat up to 66 °C, add 0.02 parts of initiator azobisisobutyronitrile, keep warm for 2 h, then add 0.01 parts of initiator azobisisobutyronitrile, heat up to 80 °C, keep warm for 2 h, and cool down to 40 °C.

[0020] (2) Add 0.02 parts of dibutyltin dilaurate to the reaction solution treated in step (1), stop passing nitrogen, and under stirring conditions, gradually dropwise add a mixture of 12.15 parts of isocyanate ethyl acrylate and 12.15 parts of ethyl acetate into the reaction solution within half an hour, keep warm for 6 h, cool down and discharge to obtain polyurethane-containing carbon-carbon double bond acrylic resin 1. The following is a schematic diagram of the synthesis route of polyurethane-containing carbon-carbon double bond acrylic resin 1.

[0021]

[0022] 2. Synthesis of polyurethane-containing carbon-carbon double bond acrylic resin 2, which comprises the following steps: (1) Mix 30 parts of isooctyl acrylate, 35 parts of butyl acrylate, 10 parts of methyl methacrylate, 5 parts of acrylic acid, 15 parts of 2-hydroxyethyl acrylate, 5 parts of N,N-dimethylacrylamide with 100 parts of ethyl acetate evenly. Under a nitrogen atmosphere, stir and heat up to 66 °C, add 0.02 parts of initiator azobisisobutyronitrile, keep warm for 2 h, then add 0.01 parts of initiator azobisisobutyronitrile, heat up to 80 °C, keep warm for 2 h, and cool down to 40 °C.

[0023] (2) Add 0.03 parts of dibutyltin dilaurate to the reaction solution treated in step (1), stop passing nitrogen, and under stirring conditions, gradually dropwise add a mixture of 18.23 parts of isocyanate ethyl acrylate and 18.23 parts of ethyl acetate into the reaction solution within half an hour, keep warm for 5 h, cool down and discharge to obtain polyurethane-containing carbon-carbon double bond acrylic resin 2. The schematic diagram of the synthesis route of polyurethane-containing carbon-carbon double bond acrylic resin 2 is as follows.

[0024]

[0025] 3. Synthesis of polyurethane-containing carbon-carbon double bond acrylic resin 3, which comprises the following steps: (1) Mix 40 parts of isooctyl acrylate, 40 parts of butyl acrylate, 10 parts of 4-hydroxybutyl acrylate, 10 parts of N,N-dimethylacrylamide with 100 parts of ethyl acetate evenly. Under a nitrogen atmosphere, stir and heat up to 66 °C, add 0.02 parts of initiator azobisisobutyronitrile, keep the temperature for 2 h, then add 0.01 parts of initiator azobisisobutyronitrile, heat up to 76 °C, keep the temperature for 3 h, and cool down to 50 °C.

[0026] (2) Add 0.02 parts of dibutyltin dilaurate to the reaction solution treated in step (1), stop passing nitrogen, and under stirring conditions, dropwise add a mixture of 9.79 parts of ethyl isocyanate acrylate and 9.79 parts of ethyl acetate into the reaction solution drop by drop within half an hour, keep the temperature for 4 h, cool down and discharge to obtain polyurethane carbon-carbon double bond acrylate resin 3. The schematic diagram of the synthesis route of polyurethane carbon-carbon double bond acrylate resin 3 is as follows.

[0027]

[0028] 4. The synthesis of polyurethane carbon-carbon double bond acrylate resin 4 includes the following steps: (1) Mix 40 parts of isooctyl acrylate, 15 parts of butyl acrylate, 5 parts of methyl methacrylate, 10 parts of 2-hydroxyethyl acrylate, 10 parts of N,N-dimethylacrylamide with 100 parts of toluene evenly. Under a nitrogen atmosphere, stir and heat up to 70 °C, add 0.04 parts of initiator benzoyl peroxide, keep the temperature for 2 h, then add 0.01 parts of initiator benzoyl peroxide, heat up to 80 °C, keep the temperature for 3 h, and cool down to 50 °C.

[0029] (2) Add 0.02 parts of dibutyltin dilaurate to the reaction solution treated in step (1), stop passing nitrogen, and under stirring conditions, dropwise add a mixture of 12.15 parts of ethyl isocyanate acrylate and 12.15 parts of ethyl acetate into the reaction solution drop by drop within half an hour, keep the temperature for 5 h, cool down and discharge to obtain polyurethane carbon-carbon double bond acrylate resin 4. The schematic diagram of the synthesis route of polyurethane carbon-carbon double bond acrylate resin 4 is as follows.

[0030]

[0031] 5. The synthesis of polyurethane carbon-carbon double bond acrylate resin 5 includes the following steps: (1) Mix 30 parts of isooctyl acrylate, 35 parts of butyl acrylate, 5 parts of methyl methacrylate, 20 parts of 2-hydroxyethyl acrylate, 10 parts of N,N-dimethylacrylamide with 100 parts of toluene evenly. Under a nitrogen atmosphere, stir and heat up to 70 °C, add 0.03 parts of initiator benzoyl peroxide, keep the temperature for 2 h, then add 0.01 parts of initiator benzoyl peroxide, heat up to 80 °C, keep the temperature for 3 h, and cool down to 50 °C.

[0032] (2) Add 0.04 part of dibutyltin dilaurate to the reaction solution after being treated in step (1), stop passing nitrogen, and under stirring conditions, gradually add a mixture of 24.3 parts of ethyl isocyanate acrylate and 24.3 parts of ethyl acetate dropwise to the reaction solution within half an hour, keep the temperature for 5 h, cool down and discharge to obtain polyurethane carbon-carbon double bond acrylic resin 5.

[0033] The schematic synthesis route of the polyurethane carbon-carbon double bond acrylic resin 5 is as follows.

[0034]

[0035] Example 1: This example is the synthesis of a UV adhesive with a cured density of 1.52 g / cm 3 and includes the following steps: Under a nitrogen atmosphere, in a double planetary stirrer, sequentially add 25 parts of polyurethane carbon-carbon double bond acrylic resin 1, 10 parts of acryloylmorpholine, 19.7 parts of methyl acrylate, 0.1 part of photoinitiator 1-hydroxycyclohexyl phenyl ketone (UV-184), and 0.1 part of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO), heat up to 80 °C, stir for 2 hours, cool down to 50 °C, add 40 parts of barium titanate, 5 parts of bismuth sulfate, and 0.1 part of leveling agent BYK302, stir for 3 hours, evacuate to remove excess solvent, and cool down to room temperature.

[0036] Example 2:

[0037] This example is the synthesis of a UV adhesive with a cured density of 2.07 g / cm 3 and includes the following steps: Under a nitrogen atmosphere, in a double planetary stirrer, sequentially add 20 parts of polyurethane carbon-carbon double bond acrylic resin 1, 10 parts of acryloylmorpholine, 14.7 parts of methyl acrylate, 0.1 part of photoinitiator 1-hydroxycyclohexyl phenyl ketone (UV-184), and 0.1 part of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO), heat up to 80 °C, stir for 2 hours, cool down to 50 °C, add 40 parts of barium titanate, 10 parts of bismuth sulfate, and 0.1 part of leveling agent BYK302, stir for 3 hours, evacuate to remove excess solvent, and cool down to room temperature.

[0038] Example 3:

[0039] This example is the synthesis of a UV adhesive with a cured density of 3.06 g / cm 3 and includes the following steps: In a nitrogen atmosphere, in a double-planet stirrer, 15 parts of polyurethane carbon-carbon double bond acrylate resin 1, 10 parts of acryloylmorpholine, 14.7 parts of methyl acrylate, 0.1 part of photoinitiator 1-hydroxycyclohexyl phenyl ketone (UV-184), and 0.1 part of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) were successively added. The temperature was raised to 80 °C and stirred for 2 hours. Then the temperature was lowered to 50 °C, 40 parts of barium titanate, 20 parts of bismuth sulfate, and 0.1 part of leveling agent BYK333 were added, and stirred for 3 hours. The excess solvent was removed by vacuum, and the temperature was lowered to room temperature.

[0040] Comparative Example 1: This comparative example is for the synthesis of a UV adhesive with a cured density of 1.52 g / cm 3 and includes the following steps: In a nitrogen atmosphere, in a double-planet stirrer, 25 parts of polyurethane carbon-carbon double bond acrylate resin 2, 29.7 parts of methyl acrylate, 0.1 part of photoinitiator 1-hydroxycyclohexyl phenyl ketone (UV-184), and 0.1 part of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) were successively added. The temperature was raised to 80 °C and stirred for 2 hours. Then the temperature was lowered to 50 °C, 40 parts of barium titanate, 5 parts of bismuth sulfate, and 0.1 part of leveling agent BYK333 were added, and stirred for 3 hours. The excess solvent was removed by vacuum, and the temperature was lowered to room temperature.

[0041] Comparative Example 2: This comparative example is for the synthesis of a UV adhesive with a cured density of 2.02 g / cm 3 and includes the following steps: In a nitrogen atmosphere, in a double-planet stirrer, 25 parts of polyurethane carbon-carbon double bond acrylate resin 2, 24.7 parts of methyl acrylate, 0.1 part of photoinitiator 1-hydroxycyclohexyl phenyl ketone (UV-184), and 0.1 part of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) were successively added. The temperature was raised to 80 °C and stirred for 2 hours. Then the temperature was lowered to 50 °C, 40 parts of barium titanate, 10 parts of bismuth sulfate, 0.05 part of leveling agent BYK302, and 0.05 part of BYK333 were added, and stirred for 3 hours. The excess solvent was removed by vacuum, and the temperature was lowered to room temperature.

[0042] Comparative Example 3: This comparative example is for the synthesis of a UV adhesive with a cured density of 3.00 g / cm 3 and includes the following steps: In a nitrogen atmosphere, in a double planetary stirrer, 15 parts of polyurethane carbon-carbon double bond acrylic resin 2, 24.7 parts of methyl acrylate, 0.1 part of photoinitiator 1-hydroxycyclohexyl phenyl ketone (UV-184), and 0.1 part of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) were added in sequence. The temperature was raised to 80 °C and stirred for 2 hours, then cooled to 50 °C, and 40 parts of barium titanate, 20 parts of bismuth sulfate, 0.05 part of leveling agent BYK302, and 0.05 part of BYK333 were added, stirred for 3 hours, the excess solvent was removed by vacuum, and the temperature was cooled to room temperature.

[0043] Effect evaluation: 1. The application thickness, irradiation time, and LED (light-emitting diode) wavelength of the UV adhesive with a cured density of 1.52 g / cm 3 synthesized in Example 1 were tested and optimized. The test standards and data are as follows: Table 1 Product curing conditions of UV (ultraviolet light) adhesive with a cured density of 1.52 g / cm 3 ※The above tests were conducted on a black substrate.

[0044] ※The above tests were conducted on a black substrate.

[0045] The hardness, density, tensile shear strength, 24H water absorption rate, heat resistance, volume resistivity, surface resistivity, and dielectric strength of the UV adhesive with a cured density of 1.52 g / cm 3 synthesized in Example 1 were tested. The test standards and data are as follows: Table 2 Cured product properties of the UV adhesive with a density of 1.52 g / cm 3 in Example 1

[0046] ※168H impact test at -40 °C to 100 °C, tensile shear strength retention rate > 90%.

[0047] 2. The application thickness, irradiation time, and LED wavelength of the UV adhesive with a cured density of 2.07 g / cm 3 synthesized in Example 2 were tested and optimized. The test standards and data are as follows: Table 3 Product curing conditions of UV adhesive with a cured density of 2.07 g / cm 3 ※The above tests were conducted on a black substrate.

[0048] ※The above tests were conducted on a black substrate.

[0049] The UV adhesive with a cured density of 2.07 g / cm synthesized in Example 23 Performance testing was carried out on the UV adhesive.

[0050] For the UV adhesive with a cured density of 2.07 g / cm 3 tests were conducted on the hardness, density, tensile shear strength, 24H water absorption rate, temperature resistance, volume resistivity, surface resistivity, and dielectric strength of the UV adhesive. The test standards and data are as follows: Table 4 Product characteristics of the UV adhesive with a cured density of 2.07 g / cm 3 of the cured UV adhesive

[0051] ※ 168H impact test at -40°C to 100°C, tensile shear strength retention rate > 90%.

[0052] 3. For the UV adhesive synthesized in Example 3 with a cured density of 3.06 g / cm 3 tests were carried out on the sizing thickness, irradiation time, and LED wavelength for optimization. The test standards and data are as follows: Table 5 Curing conditions of the UV adhesive with a cured density of 3.06 g / cm 3 of the UV adhesive

[0053] ※ The above tests were conducted on a black substrate.

[0054] For the UV adhesive synthesized in Example 3 with a cured density of 3.06 g / cm 3 tests were conducted on the hardness, density, tensile shear strength, 24H water absorption rate, temperature resistance, volume resistivity, surface resistivity, and dielectric strength of the UV adhesive. The test standards and data are as follows: Table 6 Product characteristics of the cured UV adhesive with a cured density of 3.06 g / cm 3 of the cured UV adhesive

[0055] ※ 168H impact test at -40°C to 100°C, tensile shear strength retention rate > 90%.

[0056] In Tables 2, 4, and 6, PC is polycarbonate, SUS is stainless steel, Al is aluminum; PA is polyamide (nylon); PC-SUS refers to the adhesion between polycarbonate and stainless steel; PC-Al refers to the adhesion between polycarbonate and aluminum; PC-PA refers to the adhesion between polycarbonate and polyamide (nylon).

[0057] Obviously, the above embodiments are merely examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A dynamic balance UV adhesive, characterized in that, By weight, it contains the following components: 10-30 parts of polyurethane-containing carbon-carbon double bond acrylic resin, 10-30 parts of carbon-carbon double bond acrylate monomer, 0.2-3 parts of photoinitiator, 40-60 parts of inorganic salt and 0.1-1 part of leveling agent; By weight, the reaction raw materials of the polyurethane-containing carbon-carbon double bond acrylic resin contain the following components: 30-85 parts of monomer, 5-15 parts of functional monomer, 6-25 parts of active hydroxyl group-containing functional monomer, 0.02-0.5 part of initiator, 0.01-0.5 part of catalyst and 5-30 parts of isocyanate; the isocyanate is selected from ethyl isocyanate acrylate; The monomer is selected from one or more of methyl acrylate, butyl acrylate, isooctyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate and morpholine acrylate; the functional monomer is selected from one or more of acrylic acid, methacrylic acid, N-hydroxymethyl acrylamide, glycidyl acrylate and N,N-dimethyl acrylamide; the active hydroxyl group-containing functional monomer is selected from one or more of hydroxyethyl acrylate, hydroxypropyl acrylate and hydroxybutyl acrylate.

2. The dynamic balance UV adhesive according to claim 1, characterized in that, The preparation method steps of the polyurethane-containing carbon-carbon double bond acrylic resin are as follows: S21: By weight, in a nitrogen atmosphere, 30-85 parts of monomer, 5-15 parts of functional monomer, and 6-25 parts of active hydroxyl group-containing functional monomer are mixed and heated to 60-70 °C to obtain a mixture; S22: 0.02-0.5 part of initiator is added to the reaction mixture, and after reacting at 76-90 °C for 2-8 h, the temperature is lowered to 40-60 °C to obtain an intermediate product; S23: 0.01-0.5 part of catalyst and 5-30 parts of isocyanate are added to the intermediate product, and the reaction is carried out for 2-6 h to obtain the polyurethane-containing carbon-carbon double bond acrylic resin.

3. The dynamic balance UV adhesive according to claim 1, wherein Among the reaction raw materials of the polyurethane-containing carbon-carbon double bond acrylic resin, the initiator is selected from azobisisobutyronitrile or benzoyl peroxide.

4. The dynamic balance UV adhesive according to claim 1, wherein The carbon-carbon double bond-containing acrylate monomer is selected from one or two of morpholine acrylate and methyl acrylate.

5. The dynamic balance UV adhesive according to claim 1, wherein The catalyst is selected from one or more of dioctyltin dilaurate, dibutyltin dilaurate, bismuth chloride and bismuth oxide.

6. The dynamic balance UV adhesive according to claim 1, characterized in that, The photoinitiator is selected from one or more of benzoyl dimethyl ether, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide.

7. The dynamic balance UV adhesive according to claim 1, wherein, The inorganic salt is selected from one or more of barium nitrate, barium titanate, barium sulfate, bismuth nitrate and bismuth sulfate.

8. The dynamic balance UV adhesive according to claim 1, characterized in that, The density range of the dynamic balance UV adhesive is 1.5 - 3.1 g / cm 3 .

9. The preparation method of the dynamic balance UV adhesive according to any one of claims 1-8, characterized in that, It includes the following steps: S31: By weight, in a nitrogen atmosphere, 10-30 parts of polyurethane-containing carbon-carbon double bond acrylic resin, 10-30 parts of carbon-carbon double bond acrylate monomer and 0.2-3 parts of photoinitiator are heated to 75-85 °C and mixed for 1-3 h to obtain a mixed resin liquid; S32: The mixed resin liquid is cooled to 45-55 °C, then 40-60 parts of inorganic salt and 0.1-1 part of leveling agent are added and stirred for 2-3 h to obtain the dynamic balance UV adhesive.

10. Use of the dynamic balance UV adhesive according to any one of claims 1-8, characterized in that, The surface drying time of the dynamic balance UV adhesive is 1-3 s after being irradiated by ultraviolet light.

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