High-adhesion easy-to-peel acrylic UV adhesive and preparation method thereof

Abstract

The invention relates to a high-adhesion easy-to-peel acrylic UV adhesive and a preparation method thereof. Comprising the following raw materials in parts by weight: 40 to 60 parts of bifunctional acrylic polyurethane and trifunctional acrylic polyurethane, 10 to 15 parts of vinyl hexyl acrylate, 10 to 15 parts of hyperbranched polyurethane acrylic prepolymer, 5 to 15 parts of bisphenol A glycerol dimethacrylate, 1 to 10 parts of xylylenethiol, 3 to 8 parts of photoinitiator and 0.1 to 3 parts of silane coupling agent. The high-adhesion and easy-to-peel acrylic UV adhesive disclosed by the invention is high in adhesion and easy to peel, and is suitable for being used as a nail polish adhesive.

Description

Technical Field

[0001] The present application relates to an adhesive, and more specifically, to a high-adhesion and easy-to-peel acrylic UV adhesive and a preparation method thereof. Background Art

[0002] Acrylic UV adhesive is an adhesive that generates active free radicals or cations after absorbing ultraviolet light, initiates the polymerization, cross-linking, and grafting chemical reactions of monomers, and converts the adhesive from a liquid state to a solid state within a few seconds. Compared with traditional glues, it is more efficient, energy-saving, and environmentally friendly, and the product performance is more excellent. It can be used as an adhesive or as a sizing material for paints, coatings, inks, etc.

[0003] The advantages of acrylic UV adhesive make it often used in nail polish. Nail polish, also known as UV nail polish and phototherapy nail polish, is an upgraded product of nail polish that combines the characteristics of phototherapy (UV) products. It has the characteristics of rapid curing and simple operation, and includes three parts: base coat, color coat (color gel), and top coat. Among them, the base coat is required to have excellent adhesion to the nails, and the prepared nail art can be retained for 20 - 30 days. Existing nail polishes generally have high strength, but are difficult to remove, require the use of special nail polish remover, and cause great harm to the nails, and cannot meet the usage requirements of people who often change their nail art. In recent years, a peelable nail polish has appeared on the market, which can be easily peeled off, but it has only a thin single color layer, is easy to fall off, and cannot be used as a base coat, and cannot meet the requirement of making more complex and delicate patterns on it, and has not been used by nail salons.

[0004] Therefore, it is of great value to the nail art industry and nail art enthusiasts to provide an acrylic UV adhesive that is suitable for use as a nail art base coat, has both high adhesion effect and is easy to peel off without leaving glue. Summary of the Invention

[0005] In order to solve the problem of high adhesion and easy peeling of UV adhesive, the present application provides a high-adhesion and easy-to-peel acrylic UV adhesive and a preparation method thereof.

[0006] In a first aspect, the present application provides a high-adhesion and easy-to-peel acrylic UV adhesive and a preparation method thereof, including the following raw materials in parts by mass: 40 - 60 parts of acrylic polyurethane, 10 - 15 parts of vinyl hexyl acrylate, 10 - 15 parts of hyperbranched polyurethane acrylate prepolymer, 5 - 15 parts of bisphenol A glycerol dimethacrylate, 1 - 10 parts of benzene dimercaptan, 3 - 8 parts of photoinitiator, 0.1 - 3 parts of silane coupling agent, 2 - 10 parts of hydroxyethyl methacrylate, 0.05 - 0.1 part of leveling agent, 2 - 8 parts of wetting agent, 1 - 3 parts of thickening agent, and 0.2 - 1.0 part of defoaming agent, wherein the acrylic polyurethane includes difunctional acrylic polyurethane and trifunctional acrylic polyurethane.

[0007] Acrylic polyurethane has both hardness and toughness, dries rapidly, and is suitable for use in nail polish, reducing customer waiting time. A certain mass of vinylhexyl acrylate participates in the polymerization to increase the flexibility of the glue, making the resulting glue easier to peel. By adding a certain mass of benzenedimethanethiol as a hydrogen donor and acting together with bisphenol A glycerol dimethacrylate to overcome the oxygen inhibition effect and accelerate curing. The active groups at both ends of bisphenol A glycerol dimethacrylate participate in crosslinking to optimize the crosslinked structure. At the same time, the hydroxyl groups in 2-hydroxyethyl methacrylate form hydrogen bonds with acrylic polyurethane, bisphenol A glycerol dimethacrylate, and benzenedimethanethiol, further enhancing the internal structure of the resulting UV glue and improving the cohesion of the adhesive, making the adhesive not easily torn during the peeling process. Adding a certain mass of silane coupling agent makes the UV glue more evenly dispersed and the crosslinked structure more uniform. By limiting the functionality of acrylic polyurethane to a certain extent, a certain degree of interpenetrating crosslinking can be achieved inside the resulting adhesive, having a certain strength, not easily breaking during peeling, being easier to peel, and at the same time not having insufficient molecular weight of linear polycondensation in actual production due to the presence of non-reactive groups in bifunctional polyurethane acrylate.

[0008] The adhesive system prepared from the mass components of this application has a certain viscosity. After adding hyperbranched polyurethane acrylate with a core-shell structure and a high sphericity, a large number of active groups on the surface can further optimize the crosslinked structure formed by low-functional acrylic polyurethane, improve the cohesion of the UV glue, and make the UV glue not easily break during the peeling process. At the same time, under the viscosity of this component setting, a certain cavity structure can be retained inside the hyperbranched polyurethane acrylate molecules with a high sphericity. It may be due to the fact that the UV glue prepared in this application has a certain shrinkage after curing, and the cavity generates a certain negative pressure, making the resulting UV glue have a high adhesion after being applied to the nails, and at the same time, air can enter the cavity during the peeling process as the peeling action occurs, eliminating the adhesion, and the resulting UV glue shows a good peeling effect. In summary, the applicant found during the experiment that the UV glue prepared in this application is both easy to peel and has a good adhesion effect.

[0009] In a specific embodiment, the mass ratio of bifunctional acrylic polyurethane to trifunctional acrylic polyurethane is (1.5 - 2.1):1.

[0010] By adopting the above scheme, after crosslinking, it will not cause insufficient molecular weight of linear polycondensation in actual production due to the presence of non-reactive groups in bifunctional polyurethane acrylate, and at the same time, it will not have a poor adhesion effect due to excessive rigidity. When used in combination with the hyperbranched acrylic polyurethane in this application, the resulting adhesive has both a high adhesion effect and a good peeling effect.

[0011] In a specific embodiment, the preparation steps of the hyperbranched polyurethane acrylate prepolymer include: uniformly stirring polytetrahydrofuran diol and acetone, adding isophorone diisocyanate and a catalyst, heating and stirring for reaction, adding trimethylolpropane, reacting, then adding 2-hydroxyethyl methacrylate, stirring for reaction, and rotary evaporation to obtain the hyperbranched polyurethane acrylate prepolymer.

[0012] By adopting the above scheme, the preparation method is simple. The surface of the prepared adhesive has more active groups, which can better crosslink and cure the adhesive, has a good effect on optimizing the crosslinked structure of the adhesive, has a high sphericity, and the surface structure of the prepared hyperbranched polyurethane acrylate prepolymer is relatively complex, having a good shielding effect, being suitable for the viscosity of the adhesive component of the present application, being able to retain internal cavities while achieving good dispersion, and significantly improving the adhesion effect and peeling effect of the adhesive prepared in the present application.

[0013] In a specific embodiment, the mass ratio of polytetrahydrofuran diol to isophorone diisocyanate is 2:(1 - 1.1).

[0014] By adopting the above scheme, by limiting the mass ratio of polytetrahydrofuran diol to isophorone diisocyanate, the reaction is more sufficient. The prepared hyperbranched polyurethane acrylate prepolymer does not require much post-treatment, can better participate in the crosslinking of the adhesive in the present application, and will not be too rigid at the same time. The prepared adhesive is relatively flexible and can achieve good adhesion.

[0015] In a specific embodiment, the heating and stirring temperature is 65 - 75 °C.

[0016] At this temperature, the reaction is sufficient, there are few by-products, and the prepared hyperbranched polyurethane acrylate prepolymer has a good adhesion performance to the adhesive in the present application.

[0017] In a specific embodiment, the mass ratio of acrylic polyurethane to hyperbranched polyurethane acrylate prepolymer is (4 - 4.5):1.

[0018] By adopting the above scheme, the mass ratio of acrylic polyurethane to hyperbranched polyurethane acrylate prepolymer is suitable for the crosslinked network structure of the present application. The hyperbranched polyurethane acrylate prepolymer can improve the crosslinking effect of the low-crosslinking-degree acrylic polyurethane in the present application while not bringing too much rigidity, enabling the adhesive in the present application to have good adhesion while having high cohesive force.

[0019] In a specific embodiment, the silane coupling agent is 3-aminopropyltriethoxysilane, and the mass portion is 0.6 - 0.8 parts.

[0020] By adopting the above - mentioned solution, a certain mass of 3 - aminopropyltriethoxysilane is added, which adjusts the viscosity of the adhesive, makes the leveling better, has a better adhesion effect, improves the dispersion of each component, and further optimizes the cross - linked structure. The prepared UV glue has multiple cross - linked networks interpenetrating inside, and has good bonding performance. However, the applicant found that when a relatively large amount of 3 - aminopropyltriethoxysilane is added, although the adhesion of the UV glue is improved to a certain extent, the volume shrinkage rate is reduced, resulting in a decrease in the peeling effect. Through repeated experiments, the applicant found that when the mass fraction of 3 - aminopropyltriethoxysilane added is 0.6 - 0.8 parts, the performance of the prepared UV glue is the best.

[0021] In a second aspect, the present application provides a method for preparing a high - adhesion and easy - peeling acrylic UV glue, including the following steps: mixing each component in proportion and stirring evenly to obtain the high - adhesion and easy - peeling acrylic UV glue.

[0022] By adopting the above - mentioned solution, the preparation is simple and suitable for the use of the UV glue components of the present application.

[0023] In summary, the present application has the following beneficial effects: In the present application, by using a variety of monomers such as acrylic polyurethane, vinyl hexyl acrylate, hyperbranched polyurethane acrylate prepolymer, bisphenol A glycerol dimethacrylate, benzene dimercaptan, and hydroxyethyl methacrylate in combination, the adhesive prepared has a relatively good cross - linked structure and molecular weight inside, has a certain cohesive strength, can achieve good adhesion and peeling, and at the same time has an appropriate viscosity. By using the air cavities retained by the hyperbranched polyurethane acrylate prepolymer in the prepared adhesive system, a certain negative pressure is formed after the adhesive is bonded and cured and shrinks. When peeling, the negative pressure fails, further improving the peeling performance of the prepared UV glue. By limiting the acrylic polyurethane to a two - functional polyurethane acrylate and a three - functional polyurethane acrylate with a certain mass ratio, and further limiting the mass ratio of it to the hyperbranched polyurethane acrylate prepolymer, the cross - linking degree is increased by using a large number of active groups on the surface of the hyperbranched polyurethane acrylate prepolymer, so that the prepared UV glue will not have an excessive cross - linking degree.

[0024] By limiting the type and mass fraction of the silane coupling agent, the adhesion effect and the shrinkage rate are balanced. By further limiting the preparation parameters of the hyperbranched polyurethane acrylate prepolymer, the surface of the prepared hyperbranched polyurethane acrylate prepolymer has more active groups participating in cross - linking, and can achieve a certain steric hindrance to increase the cavity volume and stability, further improving the peeling effect of the prepared UV glue. Detailed embodiments

[0025] The technical solution of the present invention will be described more specifically in combination with several specific implementation examples. The implementation examples are only partial implementation examples of the present invention, rather than all; the following specific implementation examples can be combined with each other, and the same or similar concepts or processes may not be repeated in some implementation examples.

[0026] The experimental reagents in the preparation examples, examples, and comparative examples are all conventional commercially available brands or obtained by conventional preparation processes, unless otherwise specified. Among them, the difunctional acrylic polyurethane and trifunctional acrylic polyurethane were purchased from Hubei Zhonglong Kangsheng Fine Chemical Co., Ltd.

[0027] Preparation Example Hyperbranched polyurethane acrylate prepolymer: Preparation Example 1: 20 g of polytetrahydrofuran diol and 20 ml of acetone were stirred evenly, 10 g of isophorone diisocyanate and 0.5 g of dibutyltin dilaurate were added, and the mixture was heated and stirred at 75 °C for 2 hours. Then 10 g of trimethylolpropane was added, and the reaction was carried out at 60 °C for 20 minutes. Then 11 g of 2-hydroxyethyl methacrylate was added, and the mixture was kept warm and stirred for 2.5 hours. After rotary evaporation, a hyperbranched polyurethane acrylate prepolymer was obtained.

[0028] Preparation Example 2: 20 g of polytetrahydrofuran diol and 20 ml of acetone were stirred evenly, 15 g of isophorone diisocyanate and 0.5 g of dibutyltin dilaurate were added, and the mixture was heated and stirred at 75 °C for 2 hours. Then 10 g of trimethylolpropane was added, and the reaction was carried out at 60 °C for 20 minutes. Then 11 g of 2-hydroxyethyl methacrylate was added, and the mixture was kept warm and stirred for 2.5 hours. After rotary evaporation, a hyperbranched polyurethane acrylate prepolymer was obtained. Example

[0029] Example 1 The masses of the components in this example were: 25 g of difunctional acrylic polyurethane, 25 g of trifunctional acrylic polyurethane, 10 g of vinylhexyl acrylate, 10 g of the hyperbranched polyurethane acrylate prepolymer prepared in Preparation Example 1, 15 g of bisphenol A glycerol dimethacrylate, 10 g of xylyl mercaptan, 8 g of hydroxycyclohexyl phenyl ketone, 3 g of 3-aminopropyltriethoxysilane, 10 g of 2-hydroxyethyl methacrylate, 0.1 g of leveling agent BYK-UV3510, 8 g of wetting agent BYK-333, 3 g of thickener, and 1 g of defoaming agent BYK-038.

[0030] The preparation steps were as follows: The components were mixed in proportion, stirred at 400 r / min for 100 minutes, and filtered through a 200-mesh filter to obtain a high-adhesion and easy-to-peel acrylic UV glue.

[0031] Example 2 In this example, the masses of each component are as follows: difunctional acrylic polyurethane 25 g, trifunctional acrylic polyurethane 25 g, vinyl hexyl acrylate 15 g, hyperbranched polyurethane acrylate prepolymer prepared in Preparation Example 1 15 g, bisphenol A glycerol dimethacrylate 5 g, xylyl mercaptan 1 g, hydroxycyclohexyl phenyl ketone 8 g, 3-aminopropyltriethoxysilane 3 g, 2-hydroxyethyl methacrylate 10 g, leveling agent BYK-UV3510 0.1 g, wetting agent BYK-333 8 g, thickener 3 g, defoaming agent BYK-038 1 g.

[0032] The preparation steps are as follows: Mix each component in proportion, stir at 400 r / min for 100 minutes, and filter through a 200-mesh filter to obtain a high-adhesion and easy-to-peel acrylic UV glue.

[0033] Example 3 In this example, the masses of each component are as follows: difunctional acrylic polyurethane 25 g, trifunctional acrylic polyurethane 25 g, vinyl hexyl acrylate 12 g, hyperbranched polyurethane acrylate prepolymer prepared in Preparation Example 1 12 g, bisphenol A glycerol dimethacrylate 10 g, xylyl mercaptan 5 g, hydroxycyclohexyl phenyl ketone 8 g, 3-aminopropyltriethoxysilane 3 g, 2-hydroxyethyl methacrylate 10 g, leveling agent BYK-UV3510 0.1 g, wetting agent BYK-333 8 g, thickener 3 g, defoaming agent BYK-038 1 g.

[0034] The preparation steps are as follows: Mix each component in proportion, stir at 400 r / min for 100 minutes, and filter through a 200-mesh filter to obtain a high-adhesion and easy-to-peel acrylic UV glue.

[0035] Example 4 In this example, the masses of each component are as follows: difunctional acrylic polyurethane 30 g, trifunctional acrylic polyurethane 20 g, vinyl hexyl acrylate 12 g, hyperbranched polyurethane acrylate prepolymer prepared in Preparation Example 1 12 g, bisphenol A glycerol dimethacrylate 10 g, xylyl mercaptan 5 g, hydroxycyclohexyl phenyl ketone 8 g, 3-aminopropyltriethoxysilane 3 g, 2-hydroxyethyl methacrylate 10 g, leveling agent BYK-UV3510 0.1 g, wetting agent BYK-333 8 g, thickener 3 g, defoaming agent BYK-038 1 g.

[0036] The preparation steps are as follows: Mix each component in proportion, stir at 400 r / min for 100 minutes, and filter through a 200-mesh filter to obtain a high-adhesion and easy-to-peel acrylic UV glue.

[0037] Example 5 In this example, the masses of each component are as follows: difunctional acrylic polyurethane 33 g, trifunctional acrylic polyurethane 17 g, vinyl hexyl acrylate 12 g, hyperbranched polyurethane acrylate prepolymer prepared in Preparation Example 1 12 g, bisphenol A glycerol dimethacrylate 10 g, xylyl mercaptan 5 g, hydroxycyclohexyl phenyl ketone 8 g, 3-aminopropyltriethoxysilane 3 g, 2-hydroxyethyl methacrylate 10 g, leveling agent BYK-UV3510 0.1 g, wetting agent BYK-333 8 g, thickener 3 g, defoaming agent BYK-038 1 g.

[0038] The preparation steps are as follows: Mix each component in proportion, stir at 400 r / min for 100 minutes, and filter through a 200-mesh filter screen to obtain a high-adhesion and easy-to-peel acrylic UV glue.

[0039] Example 6 In this example, the masses of each component are as follows: difunctional acrylic polyurethane 33 g, trifunctional acrylic polyurethane 17 g, vinyl hexyl acrylate 12 g, hyperbranched polyurethane acrylate prepolymer prepared in Preparation Example 1 12 g, bisphenol A glycerol dimethacrylate 10 g, xylyl mercaptan 5 g, hydroxycyclohexyl phenyl ketone 8 g, 3-aminopropyltriethoxysilane 0.7 g, 2-hydroxyethyl methacrylate 10 g, leveling agent BYK-UV3510 0.1 g, wetting agent BYK-333 8 g, thickener 3 g, defoaming agent BYK-038 1 g.

[0040] The preparation steps are as follows: Mix each component in proportion, stir at 400 r / min for 100 minutes, and filter through a 200-mesh filter screen to obtain a high-adhesion and easy-to-peel acrylic UV glue.

[0041] Example 7 In this example, the masses of each component are as follows: difunctional acrylic polyurethane 25 g, trifunctional acrylic polyurethane 25 g, vinyl hexyl acrylate 12 g, hyperbranched polyurethane acrylate prepolymer prepared in Preparation Example 2 12 g, bisphenol A glycerol dimethacrylate 10 g, xylyl mercaptan 5 g, hydroxycyclohexyl phenyl ketone 8 g, 3-aminopropyltriethoxysilane 3 g, 2-hydroxyethyl methacrylate 10 g, leveling agent BYK-UV3510 0.1 g, wetting agent BYK-333 8 g, thickener 3 g, defoaming agent BYK-038 1 g.

[0042] The preparation steps are as follows: Mix each component in proportion, stir at 400 r / min for 100 minutes, and filter through a 200-mesh filter screen to obtain a high-adhesion and easy-to-peel acrylic UV glue.

[0043] Example 8 In this embodiment, the masses of the components are as follows: bifunctional acrylic polyurethane 33 g, trifunctional acrylic polyurethane 17 g, vinyl hexyl acrylate 12 g, hyperbranched polyurethane acrylate prepolymer prepared in Preparation Example 1 11.5 g, bisphenol A glycerol dimethacrylate 10 g, xylyl mercaptan 5 g, hydroxycyclohexyl phenyl ketone 8 g, 3-aminopropyltriethoxysilane 0.7 g, 2-hydroxyethyl methacrylate 10 g, leveling agent BYK-UV3510 0.1 g, wetting agent BYK-333 8 g, thickener 3 g, defoaming agent BYK-038 1 g.

[0044] The preparation steps are as follows: Mix the components in proportion, stir at 400 r / min for 100 minutes, and filter through a 200-mesh filter to obtain a high-adhesion and easy-to-peel acrylic UV glue.

[0045] Comparative Example Comparative Example 1 In this comparative example, the masses of the components are as follows: bifunctional acrylic polyurethane 50 g, vinyl hexyl acrylate 10 g, hyperbranched polyurethane acrylate prepolymer prepared in Preparation Example 1 10 g, bisphenol A glycerol dimethacrylate 15 g, xylyl mercaptan 10 g, hydroxycyclohexyl phenyl ketone 8 g, 3-aminopropyltriethoxysilane 3 g, 2-hydroxyethyl methacrylate 10 g, leveling agent BYK-UV3510 0.1 g, wetting agent BYK-333 8 g, thickener 3 g, defoaming agent BYK-038 1 g.

[0046] The preparation steps are as follows: Mix the components in proportion, stir at 400 r / min for 100 minutes, and filter through a 200-mesh filter to obtain a high-adhesion and easy-to-peel acrylic UV glue.

[0047] Comparative Example 2 In this comparative example, the masses of the components are as follows: bifunctional acrylic polyurethane 25 g, trifunctional acrylic polyurethane 25 g, vinyl hexyl acrylate 10 g, bisphenol A glycerol dimethacrylate 15 g, xylyl mercaptan 10 g, hydroxycyclohexyl phenyl ketone 8 g, 3-aminopropyltriethoxysilane 3 g, 2-hydroxyethyl methacrylate 10 g, leveling agent BYK-UV3510 0.1 g, wetting agent BYK-333 8 g, thickener 3 g, defoaming agent BYK-038 1 g.

[0048] The preparation steps are as follows: Mix the components in proportion, stir at 400 r / min for 100 minutes, and filter through a 200-mesh filter to obtain a high-adhesion and easy-to-peel acrylic UV glue.

[0049] Comparative Example 3 The masses of the components in this comparative example are as follows: 25 g of difunctional acrylic polyurethane, 25 g of trifunctional acrylic polyurethane, 10 g of vinyl hexyl acrylate, 10 g of the hyperbranched polyurethane acrylate prepolymer prepared in Preparation Example 1, 15 g of bisphenol A glycerol dimethacrylate, 10 g of benzene dimethanethiol, 8 g of hydroxycyclohexyl phenyl ketone, 10 g of hydroxyethyl methacrylate, 0.1 g of leveling agent BYK-UV3510, 8 g of wetting agent BYK-333, 3 g of thickener, and 1 g of defoaming agent BYK-038.

[0050] The preparation steps are as follows: Mix the components in proportion, stir at 400 r / min for 100 minutes, and filter through a 200-mesh filter screen to obtain a high-adhesion and easy-to-peel acrylic UV glue.

[0051] Performance detection test Test 1: Uniformly coat the high-adhesion and easy-to-peel acrylic UV glue prepared in this application on the nails, and irradiate the nail surface with a 32W LED nail lamp for 60s to obtain a cured coating. Refer to the cross-cut test method for paint films in GB / T9286-88 to measure the adhesion of the cured film, which is divided into 6 grades (0-5), with 0 being the best and 5 being the worst.

[0052] Test 2: Uniformly coat the high-adhesion and easy-to-peel acrylic UV glue prepared in this application on the nails, and irradiate the nail surface with a 32W LED nail lamp for 60s to obtain a cured coating. Refer to the "Test Method for 180° Peel Strength of Adhesives" in GB / T2790-1995 standard for 180° peel test, and observe the integrity of the peeled coating. Record the number of peeling times required for a completely peeled coating, with a tensile speed of 50 mm / min.

[0053] The test results are summarized in Table 1.

[0054] Table 1 Adhesion grade Whether it is completely peeled off, number of complete peeling times Peeling strength (kN / m) Example 1 2 Completely peeled off, 4 0.34 Example 2 2 Completely peeled off, 4 0.33 Example 3 2 Completely peeled off, 3 0.30 Example 4 1 Completely peeled off, 2 0.27 Example 5 1 Completely peeled off, 1 0.28 Example 6 1 Completely peeled off, 1 0.22 Example 7 2 Completely peeled off, 3 0.30 Example 8 0 Completely peeled off, 1 0.22 Comparative example 1 4 Completely peeled off, 9 0.30 Comparative example 2 4 Not completely peeled off, peeling area is about 75% 0.54 Comparative example 3 3 Not completely peeled off, peeling area is about 95% 0.32 Combined with Examples 1-3, Example 7, Comparative Examples 1-3 and Table 1, the UV glue prepared in this application has high cohesive force and adhesion, good adhesion and peeling effects. At the same time, due to the high cohesive force, the peeled coating is relatively complete.

[0055] Combined with Examples 3-5, Comparative Example 1 and Table 1, by limiting the mass ratio of difunctional acrylic polyurethane and trifunctional acrylic polyurethane, the cross-linking structure of this application is further optimized, and the cross-linking effect with the hyperbranched polyurethane acrylate prepolymer is good. The adhesion, cohesive force and peeling effect of the prepared UV glue have all been improved to a certain extent.

[0056] Combined with Examples 5-6 and Table 1, by limiting the mass of 3-aminopropyltriethoxysilane, the easy-to-peel effect is improved while not significantly reducing the adhesion strength.

[0057] Combined with Examples 1-3, 5-6, 8, Comparative Example 2 and Table 1, by limiting the mass ratio of acrylic polyurethane and hyperbranched polyurethane acrylate prepolymer in the present application, the hyperbranched polyurethane acrylate prepolymer will not account for too much, resulting in excessive coating rigidity and excessive crosslinking, which leads to poor coating adhesion, nor will it account for too little, resulting in poor peeling effect.

[0058] This specific embodiment of the present application is only an explanation of the present application, and it is not a limitation of the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A high-adhesion and easy-to-peel acrylic UV adhesive, characterized by: The invention comprises the following raw materials in parts by mass: 40-60 parts of acrylic polyurethane, 10-15 parts of vinyl hexyl acrylate, 10-15 parts of hyperbranched polyurethane acrylic prepolymer, 5-15 parts of bisphenol A propylene glycol dimethacrylate, 1-10 parts of benzyl mercaptan, 3-8 parts of photoinitiator, 0.1-3 parts of silane coupling agent, 2-10 parts of hydroxyethyl methacrylate, 0.05-0.1 parts of leveling agent, 2-8 parts of wetting agent, 1-3 parts of thickener and 0.2-1.0 parts of defoaming agent. The acrylic polyurethane comprises difunctional acrylic polyurethane and trifunctional acrylic polyurethane.

2. The high-adhesion and easy-to-peel acrylic UV adhesive according to claim 1, characterized in that: The mass ratio of the difunctional acrylic polyurethane to the trifunctional acrylic polyurethane is (1.5-2.1):

1.

3. The high adhesion and easy-to-peel acrylic UV adhesive according to claim 1, characterized in that: The preparation steps of the hyperbranched polyurethane acrylic prepolymer include: uniformly stirring polytetramethylene glycol and acetone, adding isophorone diisocyanate and a catalyst, heating and stirring for reaction, adding trimethylolpropane, reacting, adding hydroxyethyl methacrylate, stirring for reaction, and rotary evaporation to obtain the hyperbranched polyurethane acrylic prepolymer.

4. The high-adhesion and easy-to-peel acrylic UV adhesive according to claim 3, characterized in that: The mass ratio of the polytetrahydrofuran diol to isophorone diisocyanate is 2:(1-1.1).

5. The high-adhesion and easy-to-peel acrylic UV adhesive according to claim 3, characterized in that: The heating and stirring temperature is 65-75°C.

6. The high-adhesion and easy-to-peel acrylic UV adhesive according to claim 3, characterized in that: The mass ratio of the acrylic polyurethane to the hyperbranched polyurethane acrylic prepolymer is (4-4.5):

1.

7. The high-adhesion and easy-to-peel acrylic UV adhesive according to claim 1, characterized in that: The silane coupling agent is 3-aminopropyltriethoxysilane, with a mass fraction of 0.6-0.8 parts.

8. A method for preparing the high-adhesion and easily peelable acrylic UV adhesive according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: mixing the components in proportion and stirring evenly to obtain high-adhesion and easy-to-peel acrylic UV adhesive.