Ultraviolet curing gel composition, ultraviolet curing glue as well as preparation method and application of ultraviolet curing glue

Abstract

The invention provides an ultraviolet light curing gel composition, an ultraviolet light curing glue and a preparation method and application thereof, the ultraviolet light curing gel composition comprises the following components by weight: 10-50 parts of polypropylene glycol functional monomer containing unsaturated bonds; 10 to 45 parts of aliphatic polyurethane acrylic resin; 0.5 to 2 parts of wormwood extract; 3 to 10.5 parts of a photoinitiator; 0.3 to 0.5 part of a leveling agent; and 0.2 to 0.5 part of a defoaming agent. According to the ultraviolet curing gel composition, under the synergistic effect of all the components, not only can the prepared ultraviolet curing glue have excellent viscosity and bonding performance, but also the adaptive capacity and durability of the ultraviolet curing glue in a complex environment are improved. The prepared ultraviolet curing glue is used in the field of manicure, can provide additional health protection for a nail bed while ensuring the binding power and the aesthetic property, and shows a new generation of manicure product taking both the aesthetic property and the comfortable experience into account.

Description

Technical Field

[0001] This invention relates to the field of nail glue technology, and more specifically, to a UV-curable gel composition, a UV-curable glue, its preparation method, and its application. Background Technology

[0002] With the rapid development of the global economy and the continuous expansion of the service industry, the modern beauty industry has become one of the important driving forces for economic growth. Nail art, as a refined beauty art, has become an indispensable part of people's daily lives in modern society. However, as consumers' demands for the nail art experience continue to rise, simply pursuing exquisite appearance is no longer sufficient to meet market needs. More and more people are beginning to pay attention to the comfort and health aspects of nail products. This trend has placed higher demands on ultraviolet (UV) curing adhesives—products in the nail industry that require prolonged contact with the skin.

[0003] While traditional UV glues offer advantages such as rapid curing and high-strength adhesion, they often contain acrylates (such as hydroxyethyl methacrylate (HEMA) and pentaerythritol triacrylate (PETA)). These substances can irritate nails with prolonged use, and in severe cases, even cause allergic reactions and damage the natural condition of the nails. Furthermore, some traditional UV glues release excessive heat during the curing process, causing discomfort or even minor burns to users during the manicure process. Therefore, finding a new type of UV glue that can ensure the durability and aesthetics of manicures while also considering the user's health and comfort is particularly important.

[0004] In summary, given the higher demands people place on nail glue and the shortcomings of existing UV glues on the market, developing a UV glue that can provide strong adhesion, adapt to various nail shapes without causing damage, and further improve user comfort and health has become a key research focus and market demand in the nail industry. Therefore, this invention is proposed. Summary of the Invention

[0005] The main objective of this invention is to provide a UV-curable gel composition, a UV-curable adhesive, its preparation method, and its application, in order to solve the problems of insufficient adhesive durability, poor comfort, and poor health in existing UV-curable nail adhesives during use. The aim is to develop a UV-curable adhesive that can firmly bond, adapt to various nail shapes without causing damage, and further improve user comfort and health.

[0006] This application provides a UV-curable gel composition, which, by weight, comprises: 10-50 parts of a polypropylene glycol functional monomer containing unsaturated bonds; 10-45 parts of an aliphatic polyurethane acrylic resin; 0.5-2 parts of Artemisia argyi extract; 3-10.5 parts of a photoinitiator; 0.3-0.5 parts of a leveling agent; and 0.2-0.5 parts of a defoamer.

[0007] Further, by weight, the UV-curable gel composition comprises: 25-40 parts of polypropylene glycol functional monomer containing unsaturated bonds; 20-35 parts of aliphatic polyurethane acrylic resin; 0.8-1.2 parts of Artemisia argyi extract; 5-8 parts of photoinitiator; 0.3-0.5 parts of leveling agent; and 0.2-0.5 parts of defoamer.

[0008] Further, in the polypropylene glycol functional monomers containing unsaturated bonds, the unsaturated bonds are one or more selected from carbon-carbon double bonds, carbon-carbon triple bonds, acrylate bonds, acrylamide bonds, and styrene bonds; preferably, in the polypropylene glycol functional monomers containing unsaturated bonds, the unsaturated bonds are acrylate bonds; preferably, the preparation method of Artemisia argyi extract includes the following steps: drying and crushing Artemisia argyi to obtain pretreated Artemisia argyi; mixing the pretreated Artemisia argyi with a solvent, and then refluxing and concentrating to obtain Artemisia argyi extract; preferably, the dried Artemisia argyi contains... The water content is ≤5%; preferably, the drying temperature is 50~80℃; preferably, the weight ratio of pretreated Artemisia argyi to solvent is 1:(10~20); preferably, the reflux extraction temperature is 80~120℃ and the time is 1.5~3h; preferably, the reflux extraction is performed 2~5 times; preferably, the solvent is at least one of water, ethanol or petroleum ether; preferably, in the UV-curable gel composition, the weight ratio of polypropylene glycol functional monomer containing unsaturated bonds and aliphatic polyurethane acrylic resin is 1:(1.0~1.8).

[0009] Furthermore, in the UV-curable gel composition, the weight content of Artemisia argyi extract is 0.5-5%; preferably, in the UV-curable gel composition, the weight content of Artemisia argyi extract is 1.2-3.5%.

[0010] Further, the polypropylene glycol functional monomer containing unsaturated bonds is selected from one or more of dipropylene glycol diacrylate, tripropylene glycol diacrylate, propylene glycol acrylate ethylene oxide, and propylene glycol acrylate derivatives; preferably, the aliphatic polyurethane acrylate resin is selected from one or more of UVU55000 resin, UVU63050 resin, DH-62000B resin, UVU6906 resin, UVU6205 resin, UVU6250 resin, UVU6305 resin, SW9678 resin, and DH-2000B resin; preferably, the number average molecular weight of the aliphatic polyurethane acrylate resin is 2000~100000; more preferably, the aliphatic polyurethane acrylate resin has a molecular weight of 2000~100000. The number average molecular weight of the acrylic resin is 20,000 to 80,000; preferably, the photoinitiator is a free radical cleavage type photoinitiator; preferably, the free radical cleavage type photoinitiator is selected from one or more of methyl benzoylformate, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone; preferably, the leveling agent is selected from one or more of leveling agent 3, DIG 41012, DIG 27012, DIG 24512, DIG 45012 and TMIGO 351011; preferably, the defoamer is selected from one or more of BYK-028, BYK-066N, DIG 810, DIG 825 and TMIGO A34.

[0011] Further, by weight, the UV-curable gel composition comprises: 25 parts of a polypropylene glycol functional monomer containing unsaturated bonds; 35 parts of an aliphatic polyurethane acrylate resin; 2 parts of Artemisia argyi extract; 8 parts of a photoinitiator; 0.4 parts of a leveling agent; and 0.3 parts of a defoamer; or, 25 parts of a polypropylene glycol functional monomer containing unsaturated bonds; 20 parts of an aliphatic polyurethane acrylate resin; 0.8 parts of Artemisia argyi extract; 5 parts of a photoinitiator; 0.3 parts of a leveling agent; and 0.2 parts of a defoamer; or, 40 parts of a polypropylene glycol functional monomer containing unsaturated bonds; 35 parts of an aliphatic polyurethane acrylate resin; 1.2 parts of Artemisia argyi extract; 8 parts of a photoinitiator; 0.5 parts of a leveling agent; and 0.5 parts of a defoamer.

[0012] According to another aspect of the present invention, a method for preparing a UV-curable adhesive is also provided. The raw materials used in preparing the UV-curable adhesive include the above-mentioned UV-curable gel composition. The preparation method includes the following steps: mixing a polypropylene glycol functional monomer containing unsaturated bonds, an aliphatic polyurethane acrylic resin, and a photoinitiator to obtain a premixed liquid; heating the premixed liquid to carry out a polymerization reaction to obtain a first mixed slurry; and adding Artemisia argyi extract, a leveling agent, and a defoamer to the first mixed slurry to obtain the UV-curable adhesive.

[0013] Further, the mixing temperature is 50~80℃ and the time is 1~2.5h; preferably, the rotation speed during the mixing process is 500~1500rpm / min; preferably, the polymerization reaction temperature is 55~70℃ and the time is 3~6h; preferably, the rotation speed during the polymerization reaction process is 500~700rpm / min.

[0014] According to a third aspect of the present invention, a UV-curable adhesive is also provided, which is prepared by the above-described preparation method; preferably, the viscosity of the UV-curable adhesive is 100,000 to 200,000 MPa·s; more preferably, the viscosity of the UV-curable adhesive is 120,000 to 160,000 MPa·s.

[0015] According to a fourth aspect of the present invention, an application of the above-mentioned UV-curable adhesive is also provided, wherein the UV-curable adhesive is used as a nail glue in the nail industry.

[0016] This application provides a UV-curable gel composition, comprising, by weight: 10-50 parts of a polypropylene glycol functional monomer containing unsaturated bonds; 10-45 parts of an aliphatic polyurethane acrylic resin; 0.5-2 parts of Artemisia argyi extract; 3-10.5 parts of a photoinitiator; 0.3-0.5 parts of a leveling agent; and 0.2-0.5 parts of a defoamer. The UV-curable gel composition provided by this application, through the synergistic effect of the above components, not only enables the prepared UV-curable adhesive to possess excellent viscosity and bonding properties, but also improves its adaptability and durability in complex environments. When used in the nail industry, the prepared UV-curable adhesive, while ensuring adhesion and aesthetics, also provides additional health protection for the nail bed, showcasing a new generation of nail products that meets aesthetic needs while also considering health and comfort. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the embodiments.

[0018] As described in the background section, while traditional UV adhesives offer advantages such as rapid curing and high-strength adhesion, they often contain chemical components like acrylates. These substances may irritate nails with prolonged use, even causing allergic reactions and severely damaging the natural state of the nails. Furthermore, some traditional UV adhesives release excessive heat during the curing process, leading to discomfort or even minor burns for users during the manicure process. Therefore, finding a new type of UV adhesive that can ensure the durability and aesthetics of manicures while also considering the user's health and comfort is particularly important.

[0019] To address the aforementioned issues, this application provides a UV-curable gel composition, comprising, by weight: 10-50 parts of a polypropylene glycol functional monomer containing unsaturated bonds; 10-45 parts of an aliphatic polyurethane acrylic resin; 0.5-2 parts of Artemisia argyi extract; 3-10.5 parts of a photoinitiator; 0.3-0.5 parts of a leveling agent; and 0.2-0.5 parts of a defoamer. The UV-curable gel composition provided by this application, through the synergistic effect of the above components, not only enables the prepared UV-curable adhesive to possess excellent viscosity and bonding properties but also improves its adaptability and durability in complex environments. Applying the prepared UV-curable adhesive (UV adhesive) to the nail industry, while ensuring adhesion and aesthetics, also provides additional health protection for the nail bed, showcasing a new generation of nail products that meets aesthetic needs while also considering health and comfort. Specifically:

[0020] In UV-curable gel compositions, polypropylene glycol functional monomers containing unsaturated bonds enable the formed UV adhesive to exhibit better flowability during application and adaptability to different nail bed shapes. Simultaneously, the cured UV adhesive layer possesses good mechanical strength and lower skin irritation. This is because, on the one hand, the ether segments in the unsaturated polypropylene glycol functional monomers have the property of reducing system viscosity. This allows the UV adhesive formed from the UV-curable gel composition to flow better and wet substrate surfaces with different properties, increasing the contact area between the UV adhesive and the substrate and promoting deeper adhesion. On the other hand, the unsaturated bonds in the monomers (such as carbon-carbon double bonds, carbon-carbon triple bonds, acrylate bonds, etc.) can react with free radicals under UV irradiation, participating in the polymerization reaction and ultimately forming a stable cross-linked network. This not only improves the strength of the formed cured adhesive layer but also enhances its durability and stability. Furthermore, the presence of alkoxy and ether segments in polypropylene glycol functional monomers containing unsaturated bonds enables these monomers to maintain high reactivity while significantly reducing skin irritation. This makes the UV adhesive more suitable for direct contact with the nail bed, improving the safety of UV adhesive use.

[0021] The flexibility of aliphatic polyurethane acrylic resin segments endows the adhesive layer with excellent elasticity, enabling it to effectively absorb external stresses such as vibration or deformation, preventing the adhesive layer material from becoming brittle, and thus allowing for better adhesion between the cured adhesive layer and the substrate. Furthermore, because aliphatic polyurethane acrylic resin does not contain easily oxidized double bonds, the UV adhesive formed by the UV-cured gel composition exhibits excellent resistance to yellowing and weathering during use, ensuring that the material retains its original appearance and color even after prolonged exposure to UV light. Simultaneously, the urethane bonds (-NHCOO-) in the molecule can form hydrogen bonds with polar groups on the substrate surface (such as PP, HDPE, ABS), further enhancing the bond strength between the adhesive and the substrate.

[0022] Artemisia argyi extract possesses natural antibacterial and anti-inflammatory properties (such as the monoterpenoid compound 1,8-cineole). Adding Artemisia argyi extract to UV-curable gel compositions enables the formed UV glue to inhibit the proliferation of pathogenic bacteria, reducing the risk of skin irritation or infection caused by microbial contamination during the nail art process. This provides an additional protective layer for the UV glue, ensuring the safety and comfort of nail products. Users can enjoy the visual beauty of nail art while being protected from microbial attacks, further enhancing the comfort of the user experience.

[0023] The high absorption efficiency of photoinitiators at specific wavelengths (such as 255 nm and 325 nm) effectively initiates UV curing reactions, accelerating the curing process of the adhesive formed by the gel composition. Controlling the addition ratio of this component effectively improves the curing speed of the UV adhesive, reducing the waiting time for curing during nail art and enhancing the convenience and safety of the process. The addition of leveling agents significantly reduces the surface tension of the composition, providing excellent leveling properties and further ensuring the uniform distribution of the UV adhesive during application. This facilitates the formation of a smooth and even surface, enhancing the texture and gloss of the nail art. Defoamers effectively eliminate air bubbles generated during stirring and mixing in the gel composition, preventing air bubbles from remaining in the cured adhesive layer. This ensures the transparency and gloss of the adhesive layer, while also improving the precision and professionalism of the nail art.

[0024] The synergistic effect of the above components not only enables the UV glue prepared from them to provide excellent bonding performance, hardness and flexibility, but also improves its adaptability and durability in complex environments. The prepared UV glue provides additional health protection for nail art, demonstrating a UV glue that meets aesthetic needs while also taking into account health and comfort.

[0025] In particular, as mentioned above, the introduction of polypropylene glycol functional monomers containing unsaturated bonds into the UV-curable gel composition enables the formed UV adhesive to be applied smoothly and adaptable to different nail shapes. Simultaneously, the cured adhesive exhibits good mechanical strength and low skin irritation, improving the comfort and safety of the nail art process. The introduction of aliphatic polyurethane acrylic resin allows the formed UV adhesive to maintain good appearance and color stability after curing, while enhancing its adhesion strength and durability to the nails, maintaining a longer aesthetic appearance and lifespan even under harsh environmental conditions. The synergistic effect of these two components further enhances their respective advantages.

[0026] First, the polypropylene glycol functional monomers containing unsaturated bonds accelerate the free radical polymerization reaction, shortening the waiting time from coating to curing of the UV adhesive. The addition of aliphatic polyurethane acrylic resin ensures that the photoinitiator can penetrate deep into the adhesive, achieving uniform curing of the entire adhesive layer and avoiding the undesirable state of surface curing while the interior remains uncured. The synergistic effect of these two factors further achieves a balance between curing speed and deep curing. Second, the use of high-functionality monomers increases the crosslinking density, improving the material's hardness and enhancing its wear resistance and scratch resistance. The elasticity and flexibility of the aliphatic polyurethane segments balance the risk of embrittlement that may result from increased hardness, ensuring the material's elastic response under external forces and preventing crack formation. The synergistic effect of these two factors further improves the hardness and flexibility of the cured adhesive. Third, the combination of the weather resistance of the aliphatic resin and the temperature resistance of the polypropylene glycol monomer modification allows the final UV adhesive product to maintain good performance in high-temperature and high-humidity environments, resisting degradation or deterioration, and suitable for use in various global climates. At the same time, the two components mentioned above, together with the artemisia extract, can further improve the comfort and safety of the adhesive.

[0027] In summary, the UV-curable gel composition provided in this application, through the synergistic effect of the aforementioned components, not only enables the prepared UV-curable adhesive to possess excellent viscosity and bonding properties, but also improves its adaptability and durability in complex environments. In particular, the addition of Artemisia argyi extract provides additional health protection for nail art. The carefully formulated components, working together, achieve non-damaging adhesion to nails, prolong the holding time of nail art, and inhibit bacterial growth. Applying the prepared UV-curable adhesive to the nail art field ensures both adhesive strength and aesthetics while providing additional health protection for the nail bed, showcasing a new generation of nail art products that meets aesthetic needs while also considering health and comfort.

[0028] In a preferred embodiment, the UV-curable gel composition, by weight, comprises: 25-40 parts of a polypropylene glycol functional monomer containing unsaturated bonds; 20-35 parts of an aliphatic polyurethane acrylic resin; 0.8-1.2 parts of Artemisia argyi extract; 5-8 parts of a photoinitiator; 0.3-0.5 parts of a leveling agent; and 0.2-0.5 parts of a defoamer. By controlling the proportions of each component, the UV-curable gel composition of this application, through the synergistic effect of the components, results in a UV adhesive prepared from the above-mentioned UV-curable gel composition exhibiting excellent viscosity and adhesive properties, and also improving its health, adaptability, and durability in complex environments. In particular, by controlling the proportions of the above-mentioned components within the preferred range, the performance of the corresponding UV adhesive is even better.

[0029] In a preferred embodiment, the unsaturated bonds in the polypropylene glycol functional monomers are one or more of carbon-carbon double bonds, carbon-carbon triple bonds, acrylate bonds, acrylamide bonds, and styrene bonds. All of these polypropylene glycol functional monomers containing unsaturated bonds can participate in the polymerization reaction in the UV-curable gel composition, ultimately forming a stable cross-linked network. These unsaturated bonds are beneficial for further improving the strength, durability, and stability of the formed adhesive layer material. Preferably, the unsaturated bonds in the polypropylene glycol functional monomers are acrylate bonds; polypropylene glycol functional monomers containing acrylate bonds are beneficial for better improving the performance of the UV adhesive formed from the UV-curable gel composition.

[0030] Preferably, the preparation method of Artemisia argyi extract includes the following steps: drying and crushing Artemisia argyi to obtain pretreated Artemisia argyi; mixing the pretreated Artemisia argyi with a solvent, followed by reflux extraction and concentration to obtain Artemisia argyi extract. Artemisia argyi extract has excellent antibacterial ability. This application, by adding Artemisia argyi extract to the UV-curable gel composition, can further improve the health and applicability of the prepared UV adhesive through its synergistic effect with other components in the gel composition. Using the Artemisia argyi extract prepared by the above method as one of the components in the UV-curable gel composition can better improve the performance of the adhesive prepared by the UV-curable gel composition. Preferably, the moisture content of the dried Artemisia argyi is ≤5%; preferably, the drying temperature is 50~80℃; preferably, the weight ratio of pretreated Artemisia argyi to solvent is 1:(10~20); preferably, the reflux extraction temperature is 80~120℃, and the time is 1.5~3h; preferably, the number of reflux extractions is 2~5; preferably, the solvent is at least one of water, ethanol, or petroleum ether. Controlling the parameters in the preparation process of Artemisia argyi extract within the above-mentioned range can improve the performance of the prepared Artemisia argyi extract.

[0031] Preferably, in the UV-curable gel composition, the weight ratio of unsaturated polypropylene glycol functional monomers to aliphatic polyurethane acrylate resin is 1:(1.0~1.8). As mentioned above, the synergistic effect of the unsaturated polypropylene glycol functional monomers and aliphatic polyurethane acrylate resin not only better achieves a balance between the curing speed and deep curing of the gel composition, but also improves the hardness and flexibility of the cured adhesive, as well as the comfort and safety of the adhesive. Controlling the ratio of the unsaturated polypropylene glycol functional monomers and aliphatic polyurethane acrylate resin in the composition within the above range can better exert their synergistic effect. Preferably, in the UV-curable gel composition, the weight ratio of unsaturated polypropylene glycol functional monomers to aliphatic polyurethane acrylate resin is 1:(1.2~1.5). Controlling the ratio of different types of unsaturated polypropylene glycol functional monomers and aliphatic polyurethane acrylate resin in the UV-curable gel composition within the above range further enhances the above effects.

[0032] In a preferred embodiment, the weight content of Artemisia argyi extract in the UV-curable gel composition is 0.5-5%. Controlling the weight content of Artemisia argyi extract in the UV-curable gel composition within the above range can improve the performance of the UV adhesive prepared from the UV-curable gel composition. Preferably, the weight content of Artemisia argyi extract in the UV-curable gel composition is 1.2-3.5%. The effect is even better within the above preferred range.

[0033] In a preferred embodiment, the polypropylene glycol functional monomer containing unsaturated bonds is selected from one or more of dipropylene glycol diacrylate, tripropylene glycol diacrylate, propylene glycol acrylate ethylene oxide, and propylene glycol acrylate derivatives; preferably, the aliphatic polyurethane acrylate resin is selected from one or more of UVU55000 resin, UVU63050 resin, DH-62000B resin, UVU6906 resin, UVU6205 resin, UVU6250 resin, UVU6305 resin, SW9678 resin, and DH-2000B resin; preferably, the aliphatic polyurethane acrylate resin has a number average molecular weight of 2000 to 100000; more preferably, the aliphatic... The polyurethane acrylic resin has a number average molecular weight of 20,000 to 80,000; preferably, the photoinitiator is a free radical cleavage type photoinitiator; preferably, the free radical cleavage type photoinitiator is one or more selected from methyl benzoylformate, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone; preferably, the leveling agent is selected from one or more selected from leveling agent 3, DIG 41012, DIG 27012, DIG 24512, DIG 45012, and TMIGO 351011; preferably, the defoamer is selected from one or more selected from BYK-028, BYK-066N, DIG 810, DIG 825, and TMIGO A34. Using the above specific components in the UV-curable gel composition can better utilize the functions of each substance in the components, thereby improving the performance of the UV adhesive prepared from the above UV-curable gel composition. The free radical pyrolysis photoinitiator is a type I photoinitiator. This type of photoinitiator can pyrolyze to generate free radicals after being irradiated with ultraviolet light, thereby initiating a cross-linking polymerization reaction. In particular, the leveling agent, Temigo 3510, is an organosilicon leveling agent that can more effectively reduce the surface tension of UV adhesives formed by UV-cured gel compositions, enhance the smoothness and slip properties of the coating, and thus enable the UV adhesives to have better performance.

[0034] In a preferred embodiment, the UV-curable gel composition, by weight, comprises: 25 parts of a polypropylene glycol functional monomer containing unsaturated bonds; 35 parts of an aliphatic polyurethane acrylate resin; 2 parts of Artemisia argyi extract; 8 parts of a photoinitiator; 0.4 parts of a leveling agent; and 0.3 parts of a defoamer; or, 25 parts of a polypropylene glycol functional monomer containing unsaturated bonds; 20 parts of an aliphatic polyurethane acrylate resin; 0.8 parts of Artemisia argyi extract; 5 parts of a photoinitiator; 0.3 parts of a leveling agent; and 0.2 parts of a defoamer; or, 40 parts of a polypropylene glycol functional monomer containing unsaturated bonds; 35 parts of an aliphatic polyurethane acrylate resin; 1.2 parts of Artemisia argyi extract; 8 parts of a photoinitiator; 0.5 parts of a leveling agent; and 0.5 parts of a defoamer. Controlling the addition ratio of each component of the UV-curable gel composition within the above-mentioned range results in better performance of the corresponding UV-curable gel composition.

[0035] According to another aspect of the present invention, a method for preparing a UV-curable adhesive is also provided, wherein the raw material used to prepare the UV-curable adhesive is the aforementioned UV-curable gel composition. Specifically, the method for preparing the UV-curable adhesive includes the following steps: mixing a polypropylene glycol functional monomer containing unsaturated bonds, an aliphatic polyurethane acrylic resin, and a photoinitiator to obtain a premixed liquid; heating the premixed liquid to carry out a polymerization reaction to obtain a first mixed slurry; and adding Artemisia argyi extract, a leveling agent, and a defoamer to the first mixed slurry to obtain the UV-curable adhesive. The process of polymerizing the premixed liquid containing a polypropylene glycol functional monomer containing unsaturated bonds, an aliphatic polyurethane acrylic resin, and a photoinitiator can form oligomers. The formed oligomers are then mixed with components such as Artemisia argyi extract, a leveling agent, and a defoamer to obtain the UV-curable adhesive. The method described above can be used to prepare UV-curable adhesives, resulting in more uniform performance, excellent viscosity and adhesion, and improved adaptability and durability in complex environments.

[0036] In a preferred embodiment, the mixing temperature is 50-80°C, and the mixing time is 1-2.5 hours; preferably, the mixing speed is 500-1500 rpm / min; preferably, the polymerization reaction temperature is 55-70°C, and the polymerization reaction time is 3-6 hours; preferably, the polymerization reaction speed is 500-700 rpm / min. Controlling the various parameters in the UV-curable adhesive preparation process within the above ranges can further improve the uniformity of the prepared UV-curable adhesive, thereby resulting in better performance of the prepared UV-curable adhesive.

[0037] According to a third aspect of the present invention, a UV-curable adhesive is also provided, which is prepared by the above-described method for preparing UV-curable adhesives; preferably, the viscosity of the UV-curable adhesive is 100,000 to 200,000 MPa·s. Controlling the viscosity of the UV-curable adhesive within the above range is beneficial to further enhance the thixotropy and wettability of the UV-curable adhesive, and can improve the initial bonding effect of the UV-curable adhesive while also further improving the curing efficiency, resulting in a cured adhesive layer with better strength and durability. More preferably, the viscosity of the UV-curable adhesive is 120,000 to 160,000 MPa·s. Controlling the viscosity of the UV-curable adhesive within the above-described preferred range further enhances the above effects.

[0038] According to a fourth aspect of the present invention, an application of the above-described UV-curable adhesive is also provided, wherein the UV-curable adhesive is used as a nail glue in the nail art field. When the UV-curable adhesive prepared by the above method is used as a nail glue in the nail art field, the adhesive can provide strong adhesion, adapt to various nail shapes without causing damage, and further improve user comfort and health.

[0039] The present application will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed in the present application.

[0040] The Artemisia argyi extract used in this application was prepared in-house. The specific preparation method included: washing Artemisia argyi and drying it at 60°C until its moisture content was ≤5%, then grinding and pulverizing it to obtain pretreated Artemisia argyi. The pretreated Artemisia argyi was mixed with water at a weight ratio of 1:15 and extracted by reflux at 100°C for 2 hours, repeated 5 times. The resulting extract was then concentrated to obtain the Artemisia argyi extract.

[0041] Example 1

[0042] (1) By weight, the UV-curable gel composition comprises:

[0043]

[0044] (2) Preparation of UV-curable adhesive

[0045] The polypropylene glycol functional monomer containing unsaturated bonds, aliphatic polyurethane acrylic resin, and photoinitiator in the above composition are mixed at 750 rpm / min and 60°C for 1.5 h to obtain a premixed liquid. The obtained premixed liquid is heated at 60°C and 600 rpm for 5 h to carry out a polymerization reaction to obtain a first mixed slurry. Artemisia argyi extract, leveling agent, and defoamer are then added to the obtained first mixed slurry to obtain a UV-curable adhesive.

[0046] Example 2

[0047] (1) By weight, the UV-curable gel composition comprises:

[0048]

[0049] (2) Preparation of UV-curable adhesive

[0050] The polypropylene glycol functional monomer containing unsaturated bonds, aliphatic polyurethane acrylic resin, and photoinitiator in the above composition are mixed at 750 rpm / min and 80°C for 1 h to obtain a premixed liquid. The obtained premixed liquid is heated at 600 rpm / min and 70°C for 3 h to carry out a polymerization reaction to obtain a first mixed slurry. Artemisia argyi extract, leveling agent, and defoamer are then added to the obtained first mixed slurry to obtain a UV-curable adhesive.

[0051] Example 3

[0052] (1) By weight, the UV-curable gel composition comprises:

[0053]

[0054] (2) Preparation of UV-curable adhesive

[0055] The polypropylene glycol functional monomer containing unsaturated bonds, aliphatic polyurethane acrylic resin, and photoinitiator in the above composition are mixed at 750 rpm / min and 50°C for 2.5 h to obtain a premixed liquid. The obtained premixed liquid is heated at 600 rpm / min and 55°C for 6 h to carry out a polymerization reaction to obtain a first mixed slurry. Artemisia argyi extract, leveling agent, and defoamer are then added to the obtained first mixed slurry to obtain a UV-curable adhesive.

[0056] Example 4

[0057] (1) By weight, the UV-curable gel composition comprises:

[0058]

[0059] (2) Preparation of UV-curable adhesive

[0060] The polypropylene glycol functional monomer containing unsaturated bonds, aliphatic polyurethane acrylic resin, and photoinitiator in the above composition are mixed at 750 rpm / min and 60°C for 1.5 h to obtain a premixed liquid. The obtained premixed liquid is heated at 60°C and 600 rpm / min for 5 h to carry out a polymerization reaction to obtain a first mixed slurry. Artemisia argyi extract, leveling agent, and defoamer are then added to the obtained first mixed slurry to obtain a UV-curable adhesive.

[0061] Example 5

[0062] (1) By weight, the UV-curable gel composition comprises:

[0063]

[0064] (2) Preparation of UV-curable adhesive

[0065] The polypropylene glycol functional monomer containing unsaturated bonds, aliphatic polyurethane acrylic resin, and photoinitiator in the above composition are mixed at 750 rpm / min and 60°C for 1.5 h to obtain a premixed liquid. The obtained premixed liquid is heated at 60°C and 600 rpm / min for 5 h to carry out a polymerization reaction to obtain a first mixed slurry. Artemisia argyi extract, leveling agent, and defoamer are then added to the obtained first mixed slurry to obtain a UV-curable adhesive.

[0066] Example 6

[0067] The difference between Example 6 and Example 1 is that, by weight, the UV-curable gel composition comprises:

[0068]

[0069] Example 7

[0070] The difference between Example 7 and Example 1 is that, by weight, the UV-curable gel composition comprises:

[0071]

[0072] Example 8

[0073] The difference between Example 8 and Example 1 is that, by weight, the UV-curable gel composition comprises:

[0074]

[0075] Example 9

[0076] The difference between Example 9 and Example 1 is that, by weight, the UV-curable gel composition comprises:

[0077]

[0078] Comparative Example 1

[0079] The difference between Comparative Example 1 and Example 1 is that, by weight, the UV-curable gel composition comprises:

[0080]

[0081] Comparative Example 2

[0082] The difference between Comparative Example 2 and Example 1 is that, by weight, the UV-curable gel composition comprises:

[0083]

[0084] Comparative Example 3

[0085] The difference between Comparative Example 3 and Example 1 is that, by weight, the UV-curable gel composition comprises:

[0086]

[0087] The viscosity of the UV-curable adhesives prepared in the above embodiments and comparative examples was tested, and then the relevant properties of the UV-curable adhesives were tested; the specific test results are shown in Table 1. The test methods for the data in the table need further explanation here:

[0088] Test of heat release during curing: UV-curable adhesive was coated on the surface of ABS nail substrate with a thickness of 1000μm and cured at 20mW / 60s. The heat released during the curing process was measured by differential scanning calorimetry to obtain the heat release during curing.

[0089] 14-day retention rate test: UV-curable adhesive was coated with a thickness of 1000μm onto the surface of 10×10 real human nails and cured under UV light at 20mW / 60s. After 14 days, the peeling of the cured adhesive layer was counted to obtain the 14-day retention rate of the cured adhesive layer.

[0090] Nail bed damage test: Remove the cured adhesive layer from the surface of 10×10 real human nails, observe the damaged area of ​​the nail bed, and take the average value to obtain the degree of nail bed damage;

[0091] Test of monomer residue in cured adhesive layer: (1) Prepare standard solutions with different monomer concentrations, detect them by HPLC and plot the concentration-peak area standard curve; (2) Take a certain amount of UV-curable adhesive and coat it with a thickness of 1000 μm on the surface of ABS nail substrate, and cure it under the condition of 20mW / 60s to obtain the cured adhesive layer; use methanol to fully dissolve, extract and filter the adhesive layer to obtain the test solution; (3) Detect the test solution and substitute it into the concentration-peak area standard curve obtained above to obtain the monomer residue in cured adhesive layer.

[0092] Table 1

[0093]

[0094] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0095] Examples 1 to 9 describe the preparation of UV-curable adhesives using the UV-curable gel composition provided in this application. The viscosity of the obtained UV-curable adhesives was tested, and they were then used to cure ABS nail substrates. The relevant properties were tested. According to the results in Table 1, the viscosities of the UV-curable adhesives in Examples 1 to 9 are all within a good range, indicating good coating performance. Furthermore, the heat released during the UV curing process of the above-mentioned UV-curable adhesives is also low. The cured layer formed by the UV-curable adhesive has excellent adhesion to the ABS nail substrate, maintaining a high retention rate even after 14 days, and the monomer residue rate in the cured adhesive layer is also low. More importantly, the UV-curable adhesive prepared from the UV-curable gel composition provided in this application can effectively reduce damage to the nail bed. In particular, controlling the proportions of each component in the UV-curable gel composition within the preferred range results in even better performance of the corresponding UV-curable adhesive.

[0096] Artemisia argyi extract was not added when preparing the UV-curable adhesive corresponding to Comparative Example 1; when preparing the UV-curable adhesive corresponding to Comparative Example 2, polyurethane functional monomers containing unsaturated bonds were used instead of polypropylene glycol functional monomers containing unsaturated bonds; aliphatic polyurethane acrylic resin was not added when preparing the UV-curable adhesive corresponding to Comparative Example 3. Analysis of Table 1 shows that the viscosity, heat released during curing, and 14-day retention rate of the UV-curable adhesive corresponding to Comparative Example 1 are acceptable, but this UV-curable adhesive causes significant damage to the nail bed, reaching up to 8%. The UV-curable adhesive corresponding to Comparative Example 2 not only has high viscosity but also generally poor coatability and flowability. The 14-day retention rate of the cured adhesive layer formed by this UV-curable adhesive is low, only 88%. Furthermore, this UV-curable adhesive also causes significant damage to the nail bed during use. In Comparative Example 3, no aliphatic polyurethane acrylic resin was added during the preparation of the UV-curable adhesive. The cured adhesive layer formed by this UV-curable adhesive had poor adhesion, with a 14-day retention rate of only 85%, and also caused significant damage to the nail bed. It is evident that the performance of the UV-curable adhesives in Comparative Examples 1 to 3 is significantly inferior to the overall performance of the UV-curable adhesive corresponding to the embodiments of this application.

[0097] In summary, the UV-curable gel composition provided in this application, through the synergistic effect of the aforementioned components, not only enables the prepared UV-curable adhesive to possess excellent viscosity and bonding properties, but also improves its adaptability and durability in complex environments. In particular, the addition of Artemisia argyi extract provides additional health protection for nail art. The carefully formulated components achieve non-damaging adhesion to nails, prolong the holding time of nail art, and inhibit bacterial growth. Applying the prepared UV-curable adhesive to the nail art field ensures both adhesion and aesthetics while providing additional health protection for the nail bed, showcasing a new generation of nail art products that satisfy aesthetic needs while also considering health and comfort.

[0098] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A UV-curable gel composition, characterized in that, The UV-curable gel composition comprises, by weight: Polypropylene glycol functional monomers containing unsaturated bonds: 10-50 parts; Aliphatic polyurethane acrylic resin: 10~45 parts; Artemisia argyi extract: 0.5-2 parts; Photoinitiator: 3~10.5 parts; Leveling agent: 0.3~0.5 parts; Defoamer: 0.2~0.5 parts.

2. The UV-curable gel composition according to claim 1, characterized in that, The UV-curable gel composition comprises, by weight: The polypropylene glycol functional monomer containing unsaturated bonds: 25-40 parts; The aliphatic polyurethane acrylic resin: 20-35 parts; The amount of Artemisia argyi extract: 0.8~1.2 parts; The photoinitiator: 5-8 parts; The leveling agent: 0.3~0.5 parts; The defoamer: 0.2~0.5 parts.

3. The UV-curable gel composition according to claim 1, characterized in that, In the polypropylene glycol functional monomer containing unsaturated bonds, the unsaturated bonds are one or more of the following: carbon-carbon double bonds, carbon-carbon triple bonds, acrylate bonds, acrylamide bonds, and styrene bonds; Preferably, in the polypropylene glycol functional monomer containing unsaturated bonds, the unsaturated bonds are the acrylate bonds; Preferably, the preparation method of the mugwort extract includes the following steps: drying and crushing mugwort to obtain pretreated mugwort; mixing the pretreated mugwort with a solvent, and then refluxing and concentrating the mixture to obtain the mugwort extract; Preferably, the moisture content of the dried mugwort is ≤5%; Preferably, the drying temperature is 50~80℃; Preferably, the weight ratio of the pretreated Artemisia argyi to the solvent is 1:(10~20). Preferably, the reflux extraction temperature is 80~120℃, and the time is 1.5~3h; Preferably, the reflux extraction is performed 2 to 5 times; Preferably, the solvent is at least one of water, ethanol, or petroleum ether; Preferably, in the UV-curable gel composition, the weight ratio of the polypropylene glycol functional monomer containing unsaturated bonds to the aliphatic polyurethane acrylic resin is 1:(1.0~1.8).

4. The UV-curable gel composition according to any one of claims 1 to 3, characterized in that, In the ultraviolet-curable gel composition, the weight content of the Artemisia argyi extract is 0.5-5%; Preferably, in the light-curable gel composition, the weight content of the Artemisia argyi extract is 1.2-3.5%.

5. The UV-curable gel composition according to any one of claims 1 to 3, characterized in that, The polypropylene glycol functional monomer containing unsaturated bonds is selected from one or more of dipropylene glycol diacrylate, tripropylene glycol diacrylate, propylene glycol ethoxylate, and propylene glycol ethoxylate derivatives. Preferably, the aliphatic polyurethane acrylic resin is selected from one or more of UVU55000 resin, UVU63050 resin, DH-62000B resin, UVU6906 resin, UVU6205 resin, UVU6250 resin, UVU6305 resin, SW9678 resin and DH-2000B resin. Preferably, the number average molecular weight of the aliphatic polyurethane acrylic resin is 2,000 to 100,000; more preferably, the number average molecular weight of the aliphatic polyurethane acrylic resin is 20,000 to 80,000. Preferably, the photoinitiator is a radical cleavage type photoinitiator; preferably, the radical cleavage type photoinitiator is selected from one or more of methyl benzoylformate, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone; Preferably, the leveling agent is selected from one or more of leveling agent 3, DIGIC 41012, DIGIC 27012, DIGIC 24512, DIGIC 45012 and TMIGO 351011; Preferably, the defoamer is selected from one or more of BYK-028, BYK-066N, DIG 810, DIG 825 and TMIGO A34.

6. The UV-curable gel composition according to claim 5, characterized in that, The UV-curable gel composition comprises, by weight: The polypropylene glycol functional monomer containing unsaturated bonds: 25 parts; the aliphatic polyurethane acrylic resin: 35 parts; the Artemisia argyi extract: 2 parts; the photoinitiator: 8 parts; the leveling agent: 0.4 parts; the defoamer: 0.3 parts; or, The polypropylene glycol functional monomer containing unsaturated bonds: 25 parts; the aliphatic polyurethane acrylic resin: 20 parts; the Artemisia argyi extract: 0.8 parts; the photoinitiator: 5 parts; the leveling agent: 0.3 parts; the defoamer: 0.2 parts; or, The polypropylene glycol functional monomer containing unsaturated bonds: 40 parts; the aliphatic polyurethane acrylic resin: 35 parts; the Artemisia argyi extract: 1.2 parts; the photoinitiator: 8 parts; the leveling agent: 0.5 parts; the defoamer: 0.5 parts.

7. A method for preparing a UV-curable adhesive, characterized in that, The raw materials used to prepare the UV-curable adhesive include the UV-curable gel composition according to any one of claims 1 to 6, and the preparation method includes the following steps: A premixed liquid is obtained by mixing a polypropylene glycol functional monomer containing unsaturated bonds, an aliphatic polyurethane acrylic resin, and a photoinitiator; the premixed liquid is then heated to carry out a polymerization reaction to obtain a first mixed slurry. After adding Artemisia argyi extract, leveling agent and defoamer to the first mixed slurry, the UV-curable adhesive is obtained.

8. The method for preparing the UV-curable adhesive according to claim 7, characterized in that, The mixing temperature is 50~80℃, and the time is 1~2.5h; Preferably, the rotational speed during the mixing process is 500~1500 rpm / min; Preferably, the polymerization reaction is carried out at a temperature of 55~70℃ for 3~6 hours; Preferably, the rotation speed during the polymerization reaction is 500~700 rpm / min.

9. A UV-curable adhesive, characterized in that, The UV-curable adhesive is prepared by the preparation method described in claim 7 or 8; Preferably, the viscosity of the UV-curable adhesive is 100,000~200,000 MPa·s; More preferably, the viscosity of the UV-curable adhesive is 120,000~160,000 MPa·s.

10. An application of the UV-curable adhesive according to claim 9, characterized in that, The UV-curable adhesive is used as a nail glue in the nail industry.

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