A kind of nail art diamond - sticking glue and its preparation method

Abstract

The present invention discloses a nail art diamond-encrusting glue and a preparation method thereof, belonging to the technical field of material chemistry, and comprising the following components in parts by weight: 10 to 60 parts of a polyurethane copolymer, 12 to 60 parts of an acrylate composition, 1 to 10 parts of a phosphate monomer, 5 to 30 parts of an active diluent, and 1 to 10 parts of a photoinitiator. The nail art diamond-encrusting glue has good adhesion, weather resistance, durability, and abrasion resistance. In the present invention, the polyurethane copolymer is used as the main resin material and is combined with the acrylate composition. During the photocuring process of the resin, the shrinkage area is reduced, and it adheres and adsorbs on the surface of the substrate. Then, through the penetration of the phosphate and the acrylate composition into the substrate, the adhesion, weather resistance, durability, and abrasion resistance are improved; by adopting an acrylate composition including polyester acrylate, epoxy acrylate, and methacrylic acid copolymer, the adhesion, weather resistance, durability, and abrasion resistance are significantly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of material chemistry, specifically to the technical field of nail art materials. Further, it relates to a nail art diamond-encrusting glue, and more specifically, to a preparation method of the nail art diamond-encrusting glue. Background Art

[0002] Nail art is a job of decorating fingernails (toenails), also known as nail art design, with diverse forms of expression. The nail art industry entered China only a short decade ago, from concept popularization, industry formation to continuous market expansion. With the rapid development of China's economy, the update of consumption concepts, and the gradual expansion of the consumer group, research shows that as high as 98.2% of girls and 29.6% of boys are interested in nail art, and 42.1% of boys have an attitude of not resisting nail art.

[0003] To achieve diversification on nail art by sticking decorations such as diamonds on nails, the previous market operation process for sticking diamonds and other decorations on nails was to use glue containing solvents. The glue was divided into slow-drying glue and fast-drying glue. The glue was applied to the nails, and then diamonds and other ornaments were placed on it to dry and cure, and then the finished product was obtained. The previous operation process took a long time, had a strong smell, and had poor persistence and adhesion; this process was gradually phased out by the market. With the development of technology, AB glue (two-component glue) began to be used in the market to bond diamonds and other ornaments. The disadvantages of the AB glue process were long curing time, poor curing due to uneven mixing of the two components, relatively strong smell, and poor storage stability resulting in a decline in bonding performance; in order to improve the bonding of diamonds and other ornaments, the current market uses nail polish glue. The operation process for sticking diamonds is to apply a base coat on the nail surface, then apply a color coat, then stick diamonds and other decorations, and finally apply a top coat to obtain the final product. The disadvantage of the current operation process is that when sticking diamonds and other decorations, the ultraviolet lamp cannot irradiate the bottom surface of the diamond and other diamond decorations, resulting in incomplete cross-linking curing and poor adhesion, and the firmness is lacking; in terms of appearance, since the surface of the diamond and other decorations is coated with a film cured by nail polish glue, the surface lacks a distinct appearance, and there is a lack of beauty.

[0004] CN105816347A discloses a self-peeling nail armor glue and a manicure method thereof, and discloses a diamond nail armor glue, which comprises the following components in parts by weight: 40-50 parts of polyacrylate-2-crosslinked polymer; 5-12 parts of benzophenone; 20-30 parts of ethyl methacrylate; 8-16 parts of polydimethylsiloxane; 10-15 parts of trimethylolpropane triacrylate, 6-9 parts of a first composite regulator, 7-11 parts of a second composite regulator; the first composite regulator comprises a mixture of polyglycerol-2-triisostearate, glycerol and acryloyldimethyltaurine / VP copolymer mixture composed of a mass ratio of 1:3-4:1-2; and the second composite regulator comprises a mass ratio of 1:2-4, which has an excellent effect of preventing nail fungi growth, but its adhesion and weather resistance still need to be improved.

[0005] The use of diamond-encapsulating glue can protect decorations such as diamonds to a certain extent, and its properties such as adhesion, weather resistance and durability will affect the service life of decorations such as diamonds on manicures. At present, the diamond-encapsulating glue on the market has poor adhesion, weather resistance and durability, and lacks the distinct appearance traits of decorations such as diamonds. Summary of the Invention

[0006] The object of the present invention is to overcome the deficiencies of the prior art and provide a diamond-encapsulating glue for manicure, and the diamond-encapsulating glue for manicure has good adhesion, weather resistance, durability and wear resistance.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A diamond-encapsulating glue for manicure, which comprises the following components in parts by weight: 10-60 parts of polyurethane copolymer, 12-60 parts of acrylate composition, 1-10 parts of phosphate monomer, 5-30 parts of active diluent, 1-10 parts of photoinitiator;

[0009] The acrylate composition comprises polyester acrylate, epoxy acrylate and methacrylic acid copolymer.

[0010] The present invention combines the above various raw materials in a specific ratio to obtain a diamond-encapsulating glue for manicure with good adhesion, weather resistance, durability and wear resistance.

[0011] In the present invention, using polyurethane copolymer as the main resin material and cooperating with acrylate composition, during the photocuring process of the resin, the shrinkage area is reduced, and it adheres and adsorbs on the surface of the substrate, and then penetrates the substrate through phosphate and acrylate composition, thereby improving adhesion, weather resistance, durability and wear resistance.

[0012] During the experiment, the inventor conducted extensive exploration on the dosages of various components and found that when the dosages of each component were within the scope of the present invention, the nail art rhinestone glue prepared had good performance. However, when not within the scope of the present invention, the performance of the glue would be reduced, resulting in a decline in adhesion, weather resistance, durability, and abrasion resistance. This indicates that the effects achieved by the present invention are the result of the combined action of each component under the overall formulation, thereby achieving the excellent effects of the present invention.

[0013] In one embodiment, the nail art rhinestone glue comprises the following components in parts by weight: 45-60 parts of polyurethane copolymer, 12-40 parts of acrylate composition, 1-10 parts of phosphate monomer, 5-20 parts of reactive diluent, and 1-10 parts of photoinitiator. Especially when the above-mentioned various raw materials are controlled within the above ratios, the adhesion, weather resistance, durability, and abrasion resistance are better.

[0014] In one embodiment, the nail art rhinestone glue comprises the following components in parts by weight: 60 parts of polyurethane copolymer, 12 parts of acrylate composition, 10 parts of phosphate monomer, 7 parts of reactive diluent, and 10 parts of photoinitiator. Especially when the above-mentioned various raw materials are controlled within the above ratios, the adhesion, weather resistance, durability, and abrasion resistance are better.

[0015] In one embodiment, the weight ratio of polyester acrylate, epoxy acrylate, and methacrylic acid copolymer is polyester acrylate: epoxy acrylate: methacrylic acid copolymer = (1-20):(1-10):(10-30).

[0016] The inventor of the present invention conducted extensive selection and research on acrylates. First, the inventor used a single acrylate and found that when using a single acrylate (polyester acrylate, epoxy acrylate, or methacrylic acid copolymer), the adhesion, weather resistance, durability, and abrasion resistance did not meet the requirements.

[0017] The inventor found in extensive research that by using the above-mentioned acrylate composition including polyester acrylate, epoxy acrylate, and methacrylic acid copolymer and controlling their weight ratios, the adhesion, weather resistance, durability, and abrasion resistance were significantly improved under their interaction and mutual influence, and the combined use of the three had a good synergistic effect.

[0018] Furthermore, the polyester acrylate has a low acid value, strong adhesion, and a relatively soft chain segment, which is beneficial to the diffusion of the film. When it adheres to the substrate, it is beneficial to improve the weather resistance and abrasion resistance of the product.

[0019] Exemplarily, the polyester acrylate is Sartomer CN704.

[0020] Furthermore, the epoxy acrylate adheres to the substrate, which is beneficial to improving the weather resistance and abrasion resistance of the product.

[0021] Exemplarily, the epoxy acrylate is Sartomer CN151 (CNUVE151 NS).

[0022] Furthermore, the methacrylic acid copolymer is essentially a thermoplastic acrylate, which has good compatibility and weather resistance in the system, and further improves the adhesion and abrasion resistance.

[0023] Exemplarily, the methacrylic acid copolymer is DSM B805.

[0024] In one embodiment, the weight ratio of the polyester acrylate, epoxy acrylate, and methacrylic acid copolymer is polyester acrylate: epoxy acrylate: methacrylic acid copolymer = (1 - 15):(1 - 8):(10 - 20).

[0025] In one embodiment, the weight ratio of the polyester acrylate, epoxy acrylate, and methacrylic acid copolymer is polyester acrylate: epoxy acrylate: methacrylic acid copolymer = 1:1:10.

[0026] In one embodiment, the polyurethane copolymer (also known as polyurethane acrylate) comprises the following components in parts by weight: 15 - 25 parts of hydroxyl-terminated alcohol, 16 - 22 parts of dichloroethane, 14 - 18 parts of glycidyl methacrylate, 0.8 - 1.2 parts of inhibitor, 20 - 26 parts of trifluoroacetic acid, 18 - 22 parts of stannic chloride, 80 - 120 parts of deionized water, 180 - 240 parts of potassium hydroxide solution, 0.4 - 0.8 parts of diatomaceous earth, 15 - 20 parts of diisocyanate, 0.05 - 0.15 parts of catalyst. In the present invention, the above various raw materials are combined according to a specific ratio to prepare a polyurethane copolymer with excellent properties. The polyurethane copolymer has excellent adhesion, is flexible but has a certain hardness, has good abrasion resistance, is good in weather resistance, and has good anti-yellowing property.

[0027] In one embodiment, the polyurethane copolymer comprises the following raw materials for preparation in parts by weight: 20 parts of hydroxyl-terminated alcohol, 20 parts of dichloroethane, 15 parts of glycidyl methacrylate, 1 part of inhibitor, 24 parts of trifluoroacetic acid, 20 parts of stannic chloride, 100 parts of deionized water, 200 parts of potassium hydroxide solution, 0.5 parts of diatomaceous earth, 20 parts of diisocyanate, 0.1 parts of catalyst.

[0028] In one embodiment, the hydroxyl-terminated alcohol comprises at least one of 1,3-propanediol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, 1-pentanol, and 2-pentanol.

[0029] In one embodiment, the hydroxyl-terminated alcohol is 1,3-propanediol. Using the above-mentioned hydroxyl-terminated alcohol has good effects. In particular, using 1,3-propanediol, which contains double hydroxyl groups at both ends, has better effects. The prepared polyurethane acrylate has better performance, with stronger adhesion, wear resistance and weather resistance.

[0030] In one embodiment, the inhibitor includes at least one of hydroquinone, 2-tert-butylhydroquinone, methylhydroquinone, and 4-methoxyphenol.

[0031] Furthermore, the inhibitor is 4-methoxyphenol.

[0032] In one embodiment, the isocyanate includes at least one of hexamethylene diisocyanate, isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, and dicyclohexylmethane diisocyanate.

[0033] In one embodiment, the isocyanate is isophorone diisocyanate.

[0034] In one embodiment, the catalyst includes at least one of stannous octoate, dibutyltin diacetate, dibutyltin dilaurate, lead isooctoate, iron isooctoate, cobalt isooctoate, tetra-isopropyl titanate, and tetra-isobutyl titanate.

[0035] In one embodiment, the method for preparing the polyurethane copolymer includes the following steps:

[0036] (1) Mix the hydroxyl-terminated alcohol, dichloroethane, trifluoroacetic acid, and tin tetrachloride evenly to obtain a precursor.

[0037] (2) Mix glycidyl methacrylate and the inhibitor evenly to obtain a first mixed solution.

[0038] (3) Drop the first mixed solution into the precursor, react completely, add deionized water, stir evenly, add potassium hydroxide solution, stir evenly, then add diatomaceous earth, stir evenly, filter by suction to obtain a transparent liquid, wash, and perform vacuum distillation to obtain a hydroxyl-terminated unsaturated polyether.

[0039] (4) Prepare a second mixed solution by dissolving the diisocyanate in an organic solvent. Drop the catalyst into the hydroxyl-terminated unsaturated polyether obtained in step (3), disperse evenly, and then drop the second mixed solution. React until the NCO% in the system is below 0.5 wt%, and the polyurethane copolymer is obtained.

[0040] The present invention separately prepares a precursor and a first mixture first. The precursor and the first mixture are synthesized. By adding deionized water and adjusting the pH to neutral with a potassium hydroxide solution, and then adding diatomite, a hydroxyl-terminated unsaturated polyether is synthesized. Under the action of a catalyst, the hydroxyl groups of the hydroxyl-terminated unsaturated polyether react with a diisocyanate to synthesize a polyurethane acrylate with excellent properties. The polyurethane acrylate has excellent adhesion, is flexible but has a certain hardness, has good abrasion resistance, is good in weather resistance, and has good anti-yellowing property.

[0041] In one embodiment, the phosphate monomer is Sartomer CN9051. The phosphate monomer belongs to a methacrylated phosphate functional monomer and has good adhesion and abrasion resistance.

[0042] In one embodiment, the reactive diluent includes at least one of trimethylolpropane formal acrylate, tetrahydrofuran acrylate, and isobornyl acrylate.

[0043] In one embodiment, the photoinitiator includes at least one of diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide, 4-chlorobenzophenone, and methyl benzoylformate.

[0044] In one embodiment, the nail art glue for setting rhinestones further includes an auxiliary agent, and the auxiliary agent includes at least one of an antifoaming agent and a leveling agent.

[0045] It should be noted that in the present invention, those skilled in the art can select specific antifoaming agents and leveling agents according to actual needs as long as the effects of defoaming and leveling are achieved. For example, the leveling agent includes, but is not limited to, leveling agent BYK333, and the antifoaming agent includes, but is not limited to, TEGO920 antifoaming agent.

[0046] The present invention also provides a preparation method of a nail art glue for setting rhinestones, including the following steps:

[0047] Mix the polyurethane copolymer, acrylate composition, phosphate monomer, reactive diluent, photoinitiator, and auxiliary agent evenly, and filter to obtain the nail art glue for setting rhinestones.

[0048] The beneficial effects of the present invention are as follows: (1) The nail art diamond-encrusting glue of the present invention has good adhesion, weather resistance, durability and wear resistance. In the present invention, a polyurethane copolymer is used as the main resin material, combined with an acrylate composition. During the photocuring process of the resin, the shrinkage area is reduced, and it adheres and adsorbs on the surface of the substrate. Then, through the penetration of phosphate ester and acrylate composition into the substrate, the adhesion, weather resistance, durability and wear resistance are improved; (2) By adopting an acrylate composition including polyester acrylate, epoxy acrylate and methacrylic acid copolymer and controlling their weight ratios, the adhesion, weather resistance, durability and wear resistance are significantly improved under their interaction and mutual influence. The combined use of the three has a good synergistic effect; (3) The polyurethane copolymer of the present invention has excellent adhesion, is flexible but has a certain hardness, has good wear resistance, is good in weather resistance and has good anti-yellowing property. In the preparation method of the polyurethane copolymer of the present invention, a precursor and a first mixed solution are first prepared. The precursor and the first mixed solution are synthesized. By adding deionized water and adjusting the pH to neutral with potassium hydroxide solution, and then adding diatomite, a hydroxyl-terminated unsaturated polyether is synthesized. Under the action of a catalyst, the hydroxyl groups at the ends of the hydroxyl-terminated unsaturated polyether react with diisocyanate to synthesize a polyurethane copolymer with excellent properties. The polyurethane copolymer has excellent adhesion, is flexible but has a certain hardness, has good wear resistance, is good in weather resistance and has good anti-yellowing property; (4) When doing nail art, apply a top coat or a sealing glue on the nail surface. After curing, then apply the nail art diamond-encrusting glue of the present invention, thereby significantly improving the adhesion, weather resistance, durability and wear resistance; (5) When doing real-person nail art, apply a base coat on the nail surface, then apply a color glue, then print a pattern, then apply a sealing coat / top coat (glossy or matte), and finally stick diamond and other ornaments; or when doing nail art on a wearable nail plate, apply a color glue on the nail plate, then print a pattern, then apply a sealing coat / top coat (glossy or matte), dip diamond and other ornaments in the diamond-encrusting glue, and then bond them on the sealing coat / top coat (the bottom of the diamond and other ornaments can be recoated with the diamond-encrusting glue to wrap the ornaments), and finally cure them with a lamp to obtain a finished product. The above operation steps break through the existing operation process difficulties, the diamond ornaments are completely irradiated by the lamp, the crosslinking curing is complete, and the adhesion, weather resistance, durability and wear resistance are further enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a nail art flow chart of the nail art diamond-encrusting glue.

[0050] Figure 2 It is a nail art flow chart of the nail art diamond-encrusting glue on a wearable nail plate. DETAILED DESCRIPTION OF THE INVENTION

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used herein in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0053] In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined. In the description of the present invention, "several" means at least one, such as one, two, etc., unless otherwise specifically defined.

[0054] In the present invention, among the technically characterized features described in an open-ended manner, there are included closed technical solutions composed of the listed features, as well as open technical solutions containing the listed features.

[0055] In the present invention, regarding numerical ranges, unless otherwise specified, the above numerical ranges are considered continuous and include the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when the range refers to integers, it includes each integer between the minimum and maximum values of the range. In addition, when multiple ranges are provided to describe features or characteristics, these ranges can be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all sub-ranges subsumed therein.

[0056] In the present invention, there are no particular limitations on the specific dispersion and stirring treatment methods.

[0057] In the present invention, unless otherwise stated, the parts mentioned are all parts by weight.

[0058] In the examples, unless otherwise specified, the experimental methods used are all conventional methods, and the materials, reagents, etc. used, unless otherwise specified, can all be obtained from commercial channels.

[0059] The reagents used in Examples 1-5 and Comparative Examples 1-6 of the present invention are as follows:

[0060] Polyester acrylate: Sartomer CN704.

[0061] Epoxy acrylate resin: Sartomer CNUVE151 NS.

[0062] Methacrylic acid copolymer: DSM B805.

[0063] Phosphate monomer: Sartomer CD9051.

[0064] Reactive diluent-1: Changxing Etermer212A (trimethylolpropane formal acrylate).

[0065] Reactive diluent-2: Changxing EM214 (tetrahydrofuran acrylate).

[0066] Reactive diluent-3: Changxing EM70 (isobornyl acrylate).

[0067] Photoinitiator-1: BASF TPO (diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide).

[0068] Photoinitiator-2: BASF 184 (4-chlorobenzophenone).

[0069] Photoinitiator-3: BASF MBF (methyl benzoylformate).

[0070] Leveling agent: Leveling agent BYK333.

[0071] Defoaming agent: TEGO920 defoaming agent.

[0072] Example 1

[0073] A nail art glue for setting rhinestones comprises the following components in parts by weight: 60 parts of polyurethane copolymer, 12 parts of acrylate composition, 10 parts of phosphate monomer, 7 parts of reactive diluent-1, 10 parts of photoinitiator-2, 0.5 part of defoaming agent, and 0.5 part of leveling agent.

[0074] The acrylate composition comprises polyester acrylate, epoxy acrylate, and methacrylic acid copolymer; the weight ratio of polyester acrylate: epoxy acrylate: methacrylic acid copolymer is polyester acrylate: epoxy acrylate: methacrylic acid copolymer = 1:1:10.

[0075] The preparation method of the nail art glue for setting rhinestones is as follows: adding the polyurethane copolymer, acrylate composition, phosphate monomer, reactive diluent, photoinitiator, and auxiliary agent into a high-speed disperser, stirring at 1500 rpm for 30 min, and filtering with a filter screen to obtain the nail art glue for setting rhinestones.

[0076] The polyurethane copolymer described above comprises the following components in parts by weight: 20 parts of 1,3-propanediol, 20 parts of dichloroethane, 15 parts of glycidyl methacrylate, 1 part of 4-methoxyphenol, 24 parts of trifluoroacetic acid, 20 parts of tin tetrachloride, 100 parts of deionized water, 200 parts of 0.1 mol / L potassium hydroxide solution, 0.5 part of diatomaceous earth, 20 parts of isophorone diisocyanate, 0.1 part of dibutyltin dilaurate, 600 parts of washing liquid, and 40 parts of acetone.

[0077] The preparation method of the polyurethane copolymer is as follows:

[0078] (1) Place a four-necked round-bottom flask in a thermostatic heating magnetic stirrer with heat collection. The four-necked round-bottom flask is equipped with a constant-pressure dropping funnel, a reflux condenser, a three-way joint, and a magnetic stir bar. Add 1,3-propanediol and dichloroethane to the four-necked round-bottom flask, raise the temperature to 80 °C, and under a nitrogen atmosphere, add trifluoroacetic acid and tin tetrachloride, and stir evenly to obtain a precursor.

[0079] (2) Mix glycidyl methacrylate and 4-methoxyphenol evenly to obtain a first mixed solution, and add the first mixed solution to the dropping funnel.

[0080] (3) Open the valve of the dropping funnel to drop the first mixed solution into the precursor, react for 2 h, at room temperature, add deionized water, stir for 1 h, add potassium hydroxide solution to adjust the pH of the reaction solution to neutral, then add diatomaceous earth, stir evenly, filter by suction to remove solid substances, obtain a transparent liquid, wash it 3 times with the washing liquid, and remove volatile substances by steam distillation to obtain a hydroxyl-terminated unsaturated polyether; the washing liquid comprises 0.05 wt% disodium ethylenediaminetetraacetate, 40 wt% methanol, and 59.95 wt% deionized water.

[0081] (4) Add isophorone diisocyanate to acetone to prepare a second mixed solution. Add the hydroxyl-terminated unsaturated polyether to a round-bottom flask equipped with a magnetic stir bar, a reflux condenser, and a nitrogen inlet / outlet, add dibutyltin dilaurate, and at 25 °C, drop the second mixed solution into the round-bottom flask. Use the acetone-dibutylamine method to test the isocyanate group content, and react until the NCO% in the system is below 0.5 wt% to obtain the polyurethane copolymer.

[0082] When doing nail art, apply a top coat or sealing gel on the nail surface, and after curing, then apply the nail art diamond-encrusted glue described in the present invention, thereby significantly improving the adhesion, weather resistance, durability, and wear resistance; or

[0083] When doing nail art (such as Figure 1 , Figure 2As shown in the figure, when performing nail art on real nails, apply a base coat on the nail surface, then apply a color gel, then print a pattern, then apply a top coat / top coat (glossy or matte), and finally stick decorations such as diamonds; or when performing nail art on artificial nail tips, apply a color gel on the nail tips, then print a pattern, then apply a top coat / top coat (glossy or matte), dip the diamonds and other decorations in the diamond bonding glue, and then bond them on the top coat / top coat (the bottom of the diamonds and other decorations can be recoated with the diamond bonding glue to wrap the decorations), and finally cure them with a lamp to obtain the finished product. The above operation steps break through the existing operation process difficulties, the diamond decorations are completely irradiated by the lamp, the cross-linking and curing are complete, and the adhesion, weather resistance, durability, and wear resistance are further enhanced.

[0084] Example 2

[0085] A nail art diamond bonding glue, comprising the following components in parts by weight: 45 parts of polyurethane copolymer, 40 parts of acrylate composition, 1 part of phosphate monomer, 10 parts of reactive diluent-2, 1 part of photoinitiator-1, 1.5 parts of defoamer, and 1.5 parts of leveling agent.

[0086] The acrylate composition includes polyester acrylate, epoxy acrylate, and methacrylic acid copolymer; the weight ratio of polyester acrylate: epoxy acrylate: methacrylic acid copolymer is polyester acrylate: epoxy acrylate: methacrylic acid copolymer = 10:5:25.

[0087] The preparation method of the nail art diamond bonding glue is: add the polyurethane copolymer, acrylate composition, phosphate monomer, reactive diluent, photoinitiator, and auxiliary agent to a high-speed dispersant, stir at a speed of 1500 rpm for 30 minutes, and filter with a filter screen to obtain the nail art diamond bonding glue.

[0088] The polyurethane copolymer includes the following components in parts by weight: 20 parts of 1,3-propanediol, 20 parts of dichloroethane, 15 parts of glycidyl methacrylate, 1 part of 4-methoxybenzene, 24 parts of trifluoroacetic acid, 20 parts of stannic chloride, 100 parts of deionized water, 200 parts of 0.1 mol / L potassium hydroxide solution, 0.5 part of diatomaceous earth, 20 parts of isophorone diisocyanate, 0.1 part of dibutyltin dilaurate, 600 parts of washing liquid, and 40 parts of acetone.

[0089] The preparation method of the polyurethane copolymer is:

[0090] (1) Place a four-necked round-bottom flask in a thermostatic heating magnetic stirrer with heat collection. The four-necked round-bottom flask is equipped with a constant pressure dropping funnel, a reflux condenser, a three-way joint, and a magnetic stir bar. Add 1,3-propanediol and dichloroethane to the four-necked round-bottom flask, raise the temperature to 80 °C, and add trifluoroacetic acid and stannic chloride under a nitrogen atmosphere, and stir evenly to obtain a precursor;

[0091] (2) Mix glycidyl methacrylate and 4-methoxyphenol uniformly to obtain a first mixed solution, and add the first mixed solution to a dropping funnel.

[0092] (3) Open the valve of the dropping funnel to allow the first mixed solution to drop into the precursor, react for 2 h, add deionized water at room temperature, stir for 1 h, add potassium hydroxide solution to adjust the pH of the reaction solution to neutral, then add diatomaceous earth, stir evenly, filter by suction to remove solid substances, obtain a transparent liquid, wash it 3 times with a washing solution, and remove volatile substances by steam distillation to obtain a hydroxyl-terminated unsaturated polyether; the washing solution includes 0.05 wt% disodium ethylenediaminetetraacetate, 40 wt% methanol, and 59.95 wt% deionized water.

[0093] (4) Add isophorone diisocyanate to acetone to prepare a second mixed solution. Add the hydroxyl-terminated unsaturated polyether to a round-bottom flask equipped with a magnetic stirrer, a reflux condenser, and a nitrogen inlet / outlet, add dibutyltin dilaurate, and at 25 °C, drop the second mixed solution into the round-bottom flask. Use the acetone-dibutylamine method to test the isocyanate group content, and react until the NCO% in the system is below 0.5 wt% to obtain a polyurethane copolymer.

[0094] Example 3

[0095] A nail art diamond-encrusting glue comprises the following components in parts by weight: 10 parts of polyurethane copolymer, 60 parts of acrylate composition, 10 parts of phosphate monomer, 9 parts of reactive diluent-3, 6 parts of photoinitiator-3, 3 parts of defoaming agent, and 2 parts of leveling agent.

[0096] The acrylate composition includes polyester acrylate, epoxy acrylate, and methacrylic acid copolymer; the weight ratio of polyester acrylate: epoxy acrylate: methacrylic acid copolymer is polyester acrylate: epoxy acrylate: methacrylic acid copolymer = 20:10:30.

[0097] The preparation method of the nail art diamond-encrusting glue is as follows: Add the polyurethane copolymer, acrylate composition, phosphate monomer, reactive diluent, photoinitiator, and additives to a high-speed dispersant, stir at 1500 rpm for 30 min, and filter with a filter net to obtain the nail art diamond-encrusting glue.

[0098] The polyurethane copolymer includes the following components in parts by weight: 20 parts of 1,3-propanediol, 20 parts of dichloroethane, 15 parts of glycidyl methacrylate, 1 part of 4-methoxybenzene, 24 parts of trifluoroacetic acid, 20 parts of stannic chloride, 100 parts of deionized water, 200 parts of 0.1 mol / L potassium hydroxide solution, 0.5 part of diatomaceous earth, 20 parts of isophorone diisocyanate, 0.1 part of dibutyltin dilaurate, 600 parts of washing solution, and 40 parts of acetone.

[0099] The preparation method of the polyurethane copolymer is as follows:

[0100] (1) Place a four-necked round-bottom flask in a heating magnetic stirrer with heat collection and constant temperature. The four-necked round-bottom flask is equipped with a constant-pressure dropping funnel, a reflux condenser, a three-way joint, and a magnetic stir bar. Add 1,3-propanediol and dichloroethane to the four-necked round-bottom flask, raise the temperature to 80 °C, and under a nitrogen atmosphere, add trifluoroacetic acid and stannic chloride, and stir evenly to obtain a precursor.

[0101] (2) Mix glycidyl methacrylate and 4-methoxyphenol evenly to obtain a first mixed solution, and add the first mixed solution to the dropping funnel.

[0102] (3) Open the valve of the dropping funnel to allow the first mixed solution to drop into the precursor, react for 2 h, add deionized water at room temperature, stir for 1 h, add potassium hydroxide solution to adjust the pH of the reaction solution to neutral, then add diatomaceous earth, stir evenly, filter by suction to remove solid substances, obtain a transparent liquid, wash it 3 times with a washing solution, and remove volatile substances by steam distillation to obtain a hydroxyl-terminated unsaturated polyether; the washing solution includes 0.05 wt% disodium ethylenediaminetetraacetate, 40 wt% methanol, and 59.95 wt% deionized water.

[0103] (4) Add isophorone diisocyanate to acetone to prepare a second mixed solution. Add the hydroxyl-terminated unsaturated polyether to a round-bottom flask equipped with a magnetic stir bar, a reflux condenser, and a nitrogen inlet / outlet, add dibutyltin dilaurate, and at 25 °C, drop the second mixed solution into the round-bottom flask. Use the acetone-dibutylamine method to test the isocyanate group content, and react until the NCO% in the system is below 0.5 wt% to obtain the polyurethane copolymer.

[0104] Example 4

[0105] A nail art rhinestone glue comprises the following components in parts by weight: 42 parts of polyurethane copolymer, 35 parts of acrylate composition, 8 parts of phosphate monomer, 7 parts of reactive diluent-1, 6 parts of photoinitiator-2, 1 part of defoaming agent, and 1 part of leveling agent.

[0106] The acrylate composition includes polyester acrylate, epoxy acrylate, and methacrylic acid copolymer; the weight ratio of polyester acrylate: epoxy acrylate: methacrylic acid copolymer is polyester acrylate: epoxy acrylate: methacrylic acid copolymer = 12:10:13.

[0107] The preparation method of the nail art rhinestone glue is as follows: Add the polyurethane copolymer, acrylate composition, phosphate monomer, reactive diluent, photoinitiator, and auxiliary agent to a high-speed dispersant, stir at 1500 rpm for 30 min, and filter with a filter net to obtain the nail art rhinestone glue.

[0108] The polyurethane copolymer described above comprises the following components in parts by weight: 20 parts of 1,3 - propanediol, 20 parts of dichloroethane, 15 parts of glycidyl methacrylate, 1 part of 4 - methoxyphenol, 24 parts of trifluoroacetic acid, 20 parts of tin tetrachloride, 100 parts of deionized water, 200 parts of 0.1 mol / L potassium hydroxide solution, 0.5 part of diatomaceous earth, 20 parts of isophorone diisocyanate, 0.1 part of dibutyltin dilaurate, 600 parts of washing liquid, and 40 parts of acetone.

[0109] The preparation method of the polyurethane copolymer is as follows:

[0110] (1) Place a four - necked round - bottom flask in a collecting - heat type constant - temperature heating magnetic stirrer. The four - necked round - bottom flask is equipped with a constant - pressure dropping funnel, a reflux condenser, a three - way joint, and a magnetic stir bar. Add 1,3 - propanediol and dichloroethane into the four - necked round - bottom flask, raise the temperature to 80 °C, and under a nitrogen atmosphere, add trifluoroacetic acid and tin tetrachloride, and stir evenly to obtain a precursor.

[0111] (2) Mix glycidyl methacrylate and 4 - methoxyphenol evenly to obtain a first mixed solution, and add the first mixed solution into the dropping funnel.

[0112] (3) Open the valve of the dropping funnel to let the first mixed solution drip into the precursor, react for 2 h. At room temperature, add deionized water, stir for 1 h, add potassium hydroxide solution to adjust the pH of the reaction solution to neutral, then add diatomaceous earth, stir evenly, filter by suction to remove solid substances, obtain a transparent liquid, wash it 3 times with the washing liquid, and remove volatile substances by steam distillation to obtain a hydroxyl - terminated unsaturated polyether; the washing liquid comprises 0.05 wt% disodium ethylenediaminetetraacetate, 40 wt% methanol, and 59.95 wt% deionized water.

[0113] (4) Add isophorone diisocyanate into acetone to prepare a second mixed solution. Add the hydroxyl - terminated unsaturated polyether into a round - bottom flask equipped with a magnetic stir bar, a reflux condenser, and a nitrogen inlet / outlet, add dibutyltin dilaurate. At 25 °C, drip the second mixed solution into the round - bottom flask, and use the acetone - dibutylamine method to test the isocyanate group content. React until the NCO% in the system is below 0.5 wt% to obtain the polyurethane copolymer.

[0114] Example 5

[0115] A nail art rhinestone glue comprises the following components in parts by weight: 35 parts of polyurethane copolymer, 40 parts of acrylate composition, 9 parts of phosphate monomer, 10 parts of reactive diluent - 1, 5 parts of photoinitiator - 2, 0.5 part of defoamer, and 0.5 part of leveling agent.

[0116] The described acrylate composition includes polyester acrylate, epoxy acrylate, and methacrylic acid copolymer; the weight ratio of polyester acrylate: epoxy acrylate: methacrylic acid copolymer is polyester acrylate: epoxy acrylate: methacrylic acid copolymer = 12:10:13.

[0117] The preparation method of the described nail art diamond-encrusting glue is as follows: Add polyurethane copolymer, acrylate composition, phosphate monomer, active diluent, photoinitiator, and auxiliary agent into a high-speed dispersant, stir at a speed of 1500 rpm for 30 min, and filter with a filter net to obtain the nail art diamond-encrusting glue.

[0118] The described polyurethane copolymer includes the following components in parts by weight: 20 parts of 1,3-propanediol, 20 parts of dichloroethane, 15 parts of glycidyl methacrylate, 1 part of 4-methoxyphenol, 24 parts of trifluoroacetic acid, 20 parts of tin tetrachloride, 100 parts of deionized water, 200 parts of 0.1 mol / L potassium hydroxide solution, 0.5 part of diatomite, 20 parts of isophorone diisocyanate, 0.1 part of dibutyltin dilaurate, 600 parts of washing liquid, and 40 parts of acetone.

[0119] The preparation method of the described polyurethane copolymer is as follows:

[0120] (1) Place a four-necked round-bottom flask in a collecting heat type constant temperature heating magnetic stirrer. The four-necked round-bottom flask is equipped with a constant pressure dropping funnel, a reflux condenser, a three-way joint, and a magnetic stir bar. Add 1,3-propanediol and dichloroethane into the four-necked round-bottom flask, raise the temperature to 80 °C, and under a nitrogen atmosphere, add trifluoroacetic acid and tin tetrachloride, and stir evenly to obtain a precursor.

[0121] (2) Mix glycidyl methacrylate and 4-methoxyphenol evenly to obtain a first mixed solution, and add the first mixed solution into the dropping funnel.

[0122] (3) Open the valve of the dropping funnel to allow the first mixed solution to drop into the precursor, react for 2 h, at room temperature, add deionized water, stir for 1 h, add potassium hydroxide solution to adjust the pH of the reaction solution to neutral, then add diatomite, stir evenly, filter by suction to remove solid substances, obtain a transparent liquid, wash 3 times with the washing liquid, and evaporate and distill to remove volatile substances to obtain a hydroxyl-terminated unsaturated polyether; the washing liquid includes 0.05 wt% disodium ethylenediaminetetraacetate, 40 wt% methanol, and 59.95 wt% deionized water.

[0123] (4) Isophorone diisocyanate was added to acetone to prepare a second mixed solution. The hydroxyl-terminated unsaturated polyether was added to a round-bottom flask equipped with a magnetic stirrer, a reflux condenser, and a nitrogen inlet / outlet. Dibutyltin dilaurate was added. At 25 °C, the second mixed solution was dropped into the round-bottom flask, and the isocyanate group content was measured by the acetone-dibutylamine method. The reaction was continued until the NCO% in the system was below 0.5 wt%, and the polyurethane copolymer was obtained.

[0124] Comparative Example 1

[0125] The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 does not contain the polyurethane copolymer described above.

[0126] The nail art diamond-encrusting glue described in this comparative example comprises the following components in parts by weight: 12 parts of acrylate composition, 10 parts of phosphate monomer, 7 parts of reactive diluent-1, 10 parts of photoinitiator-2, 0.5 part of defoamer, and 0.5 part of leveling agent.

[0127] The acrylate composition includes polyester acrylate, epoxy acrylate, and methacrylic acid copolymer; the weight ratio of polyester acrylate: epoxy acrylate: methacrylic acid copolymer is polyester acrylate: epoxy acrylate: methacrylic acid copolymer = 1:1:10.

[0128] The preparation method of the nail art diamond-encrusting glue is as follows: The polyurethane copolymer, acrylate composition, phosphate monomer, reactive diluent, photoinitiator, and auxiliary agent are added to a high-speed dispersant, stirred at 1500 rpm for 30 min, and filtered through a filter screen to obtain the nail art diamond-encrusting glue.

[0129] Comparative Example 2

[0130] The difference between Comparative Example 2 and Example 1 is that the polyurethane copolymer in Comparative Example 2 is commercially available.

[0131] In this comparative example, the polyurethane copolymer is a difunctional aliphatic polyurethane copolymer 6282 (purchased from DSM).

[0132] The acrylate composition includes polyester acrylate, epoxy acrylate, and methacrylic acid copolymer; the weight ratio of polyester acrylate: epoxy acrylate: methacrylic acid copolymer is polyester acrylate: epoxy acrylate: methacrylic acid copolymer = 1:1:10.

[0133] The preparation method of the nail art diamond-encrusting glue is as follows: The polyurethane copolymer, acrylate composition, phosphate monomer, reactive diluent, photoinitiator, and auxiliary agent are added to a high-speed dispersant, stirred at 1500 rpm for 30 min, and filtered through a filter screen to obtain the nail art diamond-encrusting glue.

[0134] Comparative Example 3

[0135] The difference between Comparative Example 3 and Example 1 is that the polyurethane copolymer described in Comparative Example 3 is replaced with a hydroxyl-terminated unsaturated polyether.

[0136] A nail art glue for setting rhinestones, comprising the following components in parts by weight: 60 parts of hydroxyl-terminated unsaturated polyether, 12 parts of acrylate composition, 10 parts of phosphate monomer, 7 parts of reactive diluent-1, 10 parts of photoinitiator-2, 0.5 part of defoaming agent, 0.5 part of leveling agent.

[0137] The acrylate composition includes polyester acrylate, epoxy acrylate, and methacrylic acid copolymer; the weight ratio of polyester acrylate: epoxy acrylate: methacrylic acid copolymer is polyester acrylate: epoxy acrylate: methacrylic acid copolymer = 1:1:10.

[0138] The preparation method of the nail art glue for setting rhinestones is as follows: adding the polyurethane copolymer, acrylate composition, phosphate monomer, reactive diluent, photoinitiator, and additives into a high-speed disperser, stirring at a speed of 1500 rpm for 30 min, and filtering with a filter screen to obtain the nail art glue for setting rhinestones.

[0139] The polyurethane copolymer includes the following components in parts by weight: 20 parts of 1,3-propanediol, 20 parts of dichloroethane, 15 parts of glycidyl methacrylate, 1 part of 4-methoxyphenol, 24 parts of trifluoroacetic acid, 20 parts of stannic chloride, 100 parts of deionized water, 200 parts of 0.1 mol / L potassium hydroxide solution, 0.5 part of diatomite, and 600 parts of washing liquid.

[0140] The preparation method of the hydroxyl-terminated unsaturated polyether is as follows:

[0141] (1) Place a four-necked round-bottom flask in a thermostatic heating magnetic stirrer with heat collection. The four-necked round-bottom flask is equipped with a constant-pressure dropping funnel, a reflux condenser, a three-way joint, and a magnetic stir bar. Add 1,3-propanediol and dichloroethane into the four-necked round-bottom flask, raise the temperature to 80 °C, and under a nitrogen atmosphere, add trifluoroacetic acid and stannic chloride, and stir evenly to obtain a precursor;

[0142] (2) Mix glycidyl methacrylate and 4-methoxyphenol evenly to obtain a first mixed solution, and add the first mixed solution into the dropping funnel;

[0143] (3) Open the valve of the dropping funnel to allow the first mixed solution to drip into the precursor, and react for 2 h. At room temperature, add deionized water, stir for 1 h, add potassium hydroxide solution to adjust the pH of the reaction solution to neutral, then add diatomaceous earth, stir evenly, filter by suction to remove solid substances, obtain a transparent liquid, wash it 3 times with the washing solution (same as in Example 1), and remove volatile substances by autoclave distillation to obtain a hydroxyl-terminated unsaturated polyether.

[0144] Comparative Example 4

[0145] The difference between Comparative Example 4 and Example 1 is that the acrylate composition described in Comparative Example 4 does not contain polyester acrylate.

[0146] A nail art diamond-encrusting glue comprises the following components in parts by weight: 60 parts of polyurethane copolymer, 12 parts of acrylate composition, 10 parts of phosphate monomer, 7 parts of reactive diluent-1, 10 parts of photoinitiator-2, 0.5 part of defoamer, and 0.5 part of leveling agent.

[0147] The acrylate composition includes epoxy acrylate and methacrylic acid copolymer; the weight ratio of epoxy acrylate to methacrylic acid copolymer is 1.5:10.5.

[0148] The preparation method of the nail art diamond-encrusting glue is as follows: Add the polyurethane copolymer, acrylate composition, phosphate monomer, reactive diluent, photoinitiator, and auxiliary agent into a high-speed dispersant, stir at 1500 rpm for 30 min, and filter with a filter net to obtain the nail art diamond-encrusting glue.

[0149] The preparation method of the polyurethane copolymer is the same as that in Example 1.

[0150] Comparative Example 5

[0151] The difference between Comparative Example 5 and Example 1 is that the acrylate composition described in Comparative Example 5 does not contain epoxy acrylate, and the others are the same.

[0152] A nail art diamond-encrusting glue comprises the following components in parts by weight: 60 parts of polyurethane copolymer, 12 parts of acrylate composition, 10 parts of phosphate monomer, 7 parts of reactive diluent-1, 10 parts of photoinitiator-2, 0.5 part of defoamer, and 0.5 part of leveling agent.

[0153] The acrylate composition includes polyester acrylate and methacrylic acid copolymer; the weight ratio of polyester acrylate to methacrylic acid copolymer is 1.5:10.5.

[0154] The preparation method of the nail art diamond-encrusted glue is as follows: Add polyurethane copolymer, acrylate composition, phosphate monomer, active diluent, photoinitiator, and auxiliary agent into a high-speed dispersant, stir at a speed of 1500 rpm for 30 minutes, and filter with a filter screen to obtain the nail art diamond-encrusted glue.

[0155] The preparation method of the polyurethane copolymer is the same as that in Example 1.

[0156] Comparative Example 6

[0157] The difference between Comparative Example 6 and Example 1 is that the acrylate composition in Comparative Example 6 does not contain methacrylic copolymer, and the others are the same.

[0158] A nail art diamond-encrusted glue, comprising the following components in parts by weight: 60 parts of polyurethane copolymer, 12 parts of acrylate composition, 10 parts of phosphate monomer, 7 parts of active diluent-1, 10 parts of photoinitiator-2, 0.5 part of defoaming agent, and 0.5 part of leveling agent.

[0159] The acrylate composition includes polyester acrylate and epoxy acrylate; the weight ratio of the polyester acrylate to the epoxy acrylate is 1:1.

[0160] The preparation method of the nail art diamond-encrusted glue is as follows: Add polyurethane copolymer, acrylate composition, phosphate monomer, active diluent, photoinitiator, and auxiliary agent into a high-speed dispersant, stir at a speed of 1500 rpm for 30 minutes, and filter with a filter screen to obtain the nail art diamond-encrusted glue.

[0161] The preparation method of the polyurethane copolymer is the same as that in Example 1.

[0162] Test Example

[0163] Test method:

[0164] 1. Abrasion resistance: Coat the finished product on tinplate, prepare a film with a coating film applicator, cure the film by ultraviolet light, and test according to the method of GB / T 1768-2006. Adopt the rotating rubber grinding wheel method. Under the same weight weight, judge the abrasion resistance by the number of cycles required to grind off the coating to the substrate and the amount of mass loss. If the loss is large, the abrasion resistance is poor; if the loss is small, the abrasion resistance is good.

[0165] The weight measured in this product test is 50 g, and the number of cycles is 200 times.

[0166] 2. Weather resistance: The finished product is coated on tinplate, and a film is prepared using a coating film former and cured by ultraviolet light. According to the method of GB / T 1767-1979 of the national standard, the sample plate is placed in a weathering accelerated aging machine and tested for 96 hours, and the yellowing situation of the coating film is observed. If the yellowing is large, the weather resistance is poor; if the yellowing is small, the weather resistance is good.

[0167] In this experiment, a color difference meter was used to measure the yellowing situation. If the color difference value ΔΕ≥12, it indicates that the yellowing is large; if the color difference value ΔΕ≤12, it indicates that the yellowing is small. The smaller ΔΕ is, the better the yellowing resistance performance is.

[0168] 3. Persistence: Under the same weight, the finished product is adhered to decorations such as diamonds and cured by ultraviolet light to form a film. Then the sample is immersed in hot water at 60°C, and the length of time required for the glue in the sample to fall off the surface of decorations such as diamonds is used to judge the good or bad of the persistence. A short required time indicates poor persistence, and a long required time indicates good persistence.

[0169] 4. Adhesion: The finished product is coated on tinplate, and a film is prepared using a coating film former and cured by ultraviolet light. According to the method of GB / T 9286-1998 of the national standard, the cross-cut method is used. The cross-cut method is to use a tool to cut grids with a spacing of 1 mm vertically and horizontally, and the number of grids is 5×5. The tape is pulled evenly to bond the cross-cut area, and the falling-off area of the grids is observed. According to the judgment method of the national standard, grade 0 is the best and grade 5 is the worst.

[0170] The test results are shown in Table 1.

[0171] Loss amount / g ΔΕ Falling-off time / h Adhesion force / grade Example 1 0.9 3.1 72 0 Example 2 1.1 5.0 66 0 Example 3 2.0 5.9 61 0 Example 4 1.4 5.4 65 0 Example 5 1.7 5.6 62 0 Comparative example 1 7.8 15.2 12 3 Comparative example 2 6.2 13.1 20 3 Comparative example 3 5.0 12.0 48 2 Comparative example 4 6.9 12.8 31 3 Comparative example 5 6.5 12.5 35 3 Comparative example 6 6.7 12.7 30 3

[0172] It can be seen from Table 1 that the nail art diamond-encrusting glue described in the present invention has good adhesion, weather resistance, persistence and wear resistance.

[0173] Comparing Examples 1 to 5, it can be seen that the ratio of different raw materials and the mass ratio of raw materials in the acrylate composition can affect the adhesion, weather resistance, persistence and wear resistance of the nail art diamond-encrusting glue. Among them, Example 1 has the best adhesion, weather resistance, persistence and wear resistance, and it is the best implementation mode of the present invention.

[0174] Comparing Example 1 with Comparative Examples 1 to 2, it can be seen that the polyurethane copolymer prepared by the present invention can significantly improve the adhesion, weather resistance, persistence and wear resistance, and it has a better effect than the commercially available polyurethane copolymer.

[0175] Comparing Example 1 with Comparative Example 3, it can be seen that in the preparation method of the polyurethane copolymer of the present invention, a precursor and a first mixed solution are first prepared, and the precursor and the first mixed solution are synthesized. By adding deionized water and adjusting the pH to neutral with a potassium hydroxide solution, and then adding diatomaceous earth, a hydroxyl-terminated unsaturated polyether is synthesized. Under the action of a catalyst, the hydroxyl groups of the hydroxyl-terminated unsaturated polyether react with diisocyanates to synthesize a polyurethane copolymer with excellent properties. By further synthesizing the synthesized hydroxyl-terminated unsaturated polyether with diisocyanates, the adhesion, weather resistance, durability and abrasion resistance are further improved.

[0176] Comparing Example 1 with Comparative Examples 4 to 6, it can be seen that when the present invention uses a single acrylate (polyester acrylate, epoxy acrylate or methacrylic acid copolymer), the adhesion, weather resistance, durability and abrasion resistance do not meet the requirements. By using an acrylate composition including polyester acrylate, epoxy acrylate and methacrylic acid copolymer and controlling their weight ratios, under their interaction and mutual influence, the adhesion, weather resistance, durability and abrasion resistance are significantly improved, and the combined use of the three has a good synergistic effect.

[0177] In summary, the nail art diamond glue described in the present invention has good adhesion, weather resistance, durability and abrasion resistance. In the present invention, with the polyurethane copolymer as the main resin material and in combination with the acrylate composition, during the photocuring process of the resin, the shrinkage area is reduced, and it adheres and adsorbs on the surface of the substrate. Then, through the phosphate ester and the acrylate composition, the substrate is penetrated, thereby improving the adhesion, weather resistance, durability and abrasion resistance. Further, in the acrylate composition, the polyester acrylate has a low acid value, strong adhesion, and a relatively soft chain segment, which is beneficial to the diffusion of the film. It adheres to the substrate, which is beneficial to improving the weather resistance and abrasion resistance of the product. The epoxy acrylate adheres to the substrate, which is beneficial to improving the weather resistance and abrasion resistance of the product. The methacrylic acid copolymer is essentially a thermoplastic acrylate acid, which has good compatibility and weather resistance in the system, and further improves the adhesion and abrasion resistance.

[0178] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A nail art rhinestone glue, characterized in that It comprises the following components in parts by weight: 10 to 60 parts of polyurethane copolymer, 12 to 60 parts of acrylate composition, 1 to 10 parts of phosphate monomer, 5 to 30 parts of reactive diluent, and 1 to 10 parts of photoinitiator; The acrylate composition includes polyester acrylate, epoxy acrylate, and methacrylic acid copolymer; the weight ratio of polyester acrylate: epoxy acrylate: methacrylic acid copolymer is polyester acrylate: epoxy acrylate: methacrylic acid copolymer = (1 to 20): (1 to 10): (10 to 30); The polyurethane copolymer includes the following raw materials for preparation in parts by weight: 15 to 25 parts of hydroxyl-terminated alcohol, 16 to 22 parts of dichloroethane, 14 to 18 parts of glycidyl methacrylate, 0.8 to 1.2 parts of inhibitor, 20 to 26 parts of trifluoroacetic acid, 18 to 22 parts of tin tetrachloride, 80 to 120 parts of deionized water, 180 to 240 parts of potassium hydroxide solution, 0.4 to 0.8 parts of diatomaceous earth, 15 to 20 parts of diisocyanate, and 0.05 to 0.15 parts of catalyst; The preparation method of the polyurethane copolymer includes the following steps: (1) Mix hydroxyl-terminated alcohol, dichloroethane, trifluoroacetic acid, and tin tetrachloride evenly to obtain a precursor; (2) Mix glycidyl methacrylate and inhibitor evenly to obtain a first mixed solution; (3) Drop the first mixed solution into the precursor, react completely, add deionized water, stir evenly, add potassium hydroxide solution, stir evenly, then add diatomaceous earth, stir evenly, filter by suction to obtain a transparent liquid, wash, and perform vacuum distillation to obtain hydroxyl-terminated unsaturated polyether; (4) Prepare a second mixed solution by dissolving diisocyanate in an organic solvent, drop the catalyst into the hydroxyl-terminated unsaturated polyether obtained in step (3), disperse evenly, then drop the second mixed solution, and react until the NCO% in the system is below 0.5 wt%, thus obtaining the polyurethane copolymer.

2. The nail art diamond glue according to claim 1, characterized in that It comprises the following components in parts by weight: 45 to 60 parts of polyurethane copolymer, 12 to 40 parts of acrylate composition, 1 to 10 parts of phosphate monomer, 5 to 20 parts of reactive diluent, and 1 to 10 parts of photoinitiator.

3. The nail art diamond glue according to claim 1, characterized in that, It comprises the following components in parts by weight: 60 parts of polyurethane copolymer, 12 parts of acrylate composition, 10 parts of phosphate monomer, 7 parts of reactive diluent, and 10 parts of photoinitiator.

4. The nail art diamond-encrusted glue according to claim 1, wherein The weight ratio of polyester acrylate: epoxy acrylate: methacrylic acid copolymer is polyester acrylate: epoxy acrylate: methacrylic acid copolymer = (1 to 15): (1 to 8): (10 to 20).

5. The nail art diamond-encrusted glue according to claim 1, characterized in that, The weight ratio of polyester acrylate: epoxy acrylate: methacrylic acid copolymer is polyester acrylate: epoxy acrylate: methacrylic acid copolymer = 1:1:

10.

6. The nail art diamond glue according to claim 1, characterized in that, The polyurethane copolymer includes the following raw materials for preparation in parts by weight: 20 parts of hydroxyl-terminated alcohol, 20 parts of dichloroethane, 15 parts of glycidyl methacrylate, 1 part of inhibitor, 24 parts of trifluoroacetic acid, 20 parts of tin tetrachloride, 100 parts of deionized water, 200 parts of potassium hydroxide solution, 0.5 parts of diatomaceous earth, 20 parts of diisocyanate, and 0.1 parts of catalyst.

7. The nail art diamond-encrusted glue according to claim 1, wherein The terminal hydroxyl alcohol includes at least one of 1,3-propanediol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, 1-pentanol, and 2-pentanol.

8. The nail art diamond glue according to claim 7, characterized in that The terminal hydroxyl alcohol is 1,3-propanediol.

9. The nail art diamond-encrusted glue according to claim 1, characterized in that The inhibitor includes at least one of hydroquinone, 2-tert-butylhydroquinone, methylhydroquinone, and 4-methoxybenzene.

10. The nail art diamond - embedding glue according to claim 1, characterized in that, The diisocyanate includes at least one of hexamethylene diisocyanate, isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, and dicyclohexylmethane diisocyanate.

11. The nail art rhinestone glue according to claim 10, characterized in that, The diisocyanate is isophorone diisocyanate.

12. The nail art rhinestone glue according to claim 1, characterized in that, The catalyst includes at least one of stannous octoate, dibutyltin diacetate, dibutyltin dilaurate, lead isooctoate, iron isooctoate, cobalt isooctoate, tetraisopropyl titanate, and tetra-isobutyl titanate.

13. The nail art diamond-encrusted glue according to claim 1, characterized in that, The phosphate monomer is Sartomer CN9051.

14. The nail art diamond-encrusted glue according to claim 1, wherein The reactive diluent includes at least one of trimethylolpropane formal acrylate, tetrahydrofurfuryl acrylate, and isobornyl acrylate.

15. The nail art gemstone glue according to claim 1, wherein The photoinitiator includes at least one of diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide, 4-chlorobenzophenone, and methyl benzoylformate.

16. The nail art rhinestone glue according to claim 1, wherein It further includes additives, and the additives include at least one of an antifoaming agent and a leveling agent.

17. The preparation method of the nail art rhinestone glue according to claim 16, characterized in that, It includes the following steps: Mix the polyurethane copolymer, acrylate composition, phosphate monomer, reactive diluent, photoinitiator, and additives evenly, and filter to obtain the nail art rhinestone glue.

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