Two-stage UV nail glue and preparation method thereof

Abstract

The present invention relates to a two-stage UV nail glue and a preparation method thereof. The two-stage UV nail glue body is formed by partially curing raw materials including the following components: 100 parts by mass of ultraviolet light curing acrylic resin, 5-10 parts by mass of tackifying resin, 15-20 parts by mass of active diluent, 2-5 parts by mass of photoinitiator, 0.5-2 parts by mass of UV color paste, 3-8 parts by mass of leveling agent, and 0.1-1 parts by mass of natural essence; wherein the weight ratio of the tackifying resin to the active diluent is 1:(2-3); the nail glue body is 100% solid and solvent-free. The UV nail glue is environmentally friendly, easy to use, has good filling properties, and is not easy to debond.

Description

Technical Field

[0001] The invention relates to the technical field of nail glue, and in particular to a two-stage UV nail glue and a preparation method thereof. Background Art

[0002] As consumers' demand for the nail industry increases, the scale of the nail market continues to expand. At present, nail polish accounts for a relatively high proportion of nail materials on the market. As consumers' health awareness increases, the harm of nail polish to the human body is gradually being taken seriously. More and more consumers tend to choose non-toxic nail products. Nail polish also has disadvantages such as long curing time, environmental pollution, high professional requirements for operators, and the high price of professional nail art in nail salons. Therefore, safer and harmless UV nail glue has gradually appeared in people's vision. On the basis of nail polish, UV-curing nail glue has achieved the effects of short curing time, excellent environmental protection, low volatility, convenient operation, and low price. However, conventional UV nail glue is affected by traditional technology and has the risk of easy degumming. At the same time, because UV-curing nail glue is cured once and has a high molecular weight, it has poor fluidity in the later stage and cannot achieve a high degree of fit in filling. It is easy to get water and dust in daily life, resulting in undesirable phenomena. Summary of the invention

[0003] In view of the deficiencies in the prior art, the first object of the present invention is to provide a two-stage UV nail glue, which is environmentally friendly, easy to use, has a high filling fit, and is not easy to debond.

[0004] The second object of the present invention is to provide a method for preparing the UV nail glue, which has the advantages of simple preparation steps and low cost.

[0005] To achieve the first purpose of the present invention, the present invention provides a two-stage UV nail glue, which includes a nail glue body, and the nail glue body includes the following raw materials in parts by weight: the nail glue body is formed by partially curing the raw materials including the following components: 100 parts by weight of ultraviolet light-curable acrylic resin, 5 to 10 parts by weight of tackifying resin, 15 to 20 parts by weight of active diluent, 2 to 5 parts by weight of photoinitiator, 0.5 to 2 parts by weight of UV color paste, 3 to 8 parts by weight of leveling agent, and 0.1 to 1 part by weight of natural flavor; wherein the weight ratio of the tackifying resin to the active diluent is 1:(2 to 3); the active diluent has at least two ultraviolet light-curable groups; the nail glue body is 100% solid and solvent-free.

[0006] In some embodiments of the present invention, the UV-curable acrylic resin is polymerized from (meth)acrylic acid and its ester monomers, and the (meth)acrylic acid and its ester monomers are at least one of acrylic acid, methyl (meth)acrylate, ethyl (meth)acrylate, isooctyl (meth)acrylate, n-butyl (meth)acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, isobornyl (meth)acrylate, cyclohexyl (meth)acrylate, tridecyl (meth)acrylate, and pentanediol di(meth)acrylate.

[0007] In some embodiments of the present invention, the (meth)acrylic acid and its ester monomers are at least two of acrylic acid, methyl (meth)acrylate, ethyl (meth)acrylate, isooctyl (meth)acrylate, n-butyl (meth)acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, isobornyl (meth)acrylate, cyclohexyl (meth)acrylate, tridecyl (meth)acrylate, and pentanediol di(meth)acrylate.

[0008] In some embodiments of the present invention, the structural formula of the UV-curable acrylic resin is:

[0009]

[0010] In the formula, m, n and p are positive integers greater than or equal to 0, and at least one of m, n and p is not 0.

[0011] In some embodiments of the present invention, before the nail polish body is partially cured, the viscosity of the mixture of raw materials at 25° C. is 1000 to 2000 cps.

[0012] In some embodiments of the present invention, the tackifying resin is a hydrogenated rosin resin; the tackifying resin is selected from at least one of Eastman Regalite S1100, Eastman Regalite R1090, Eastman Regalite R7125, Eastman Foral 85-E, Eastman Foral 105-E, Eastman Foralyn 90, Eastman Foralyn110, Arakawa P-90, Arakawa P-100, Arakawa P-140, Arakawa M-90, Arakawa M-100, Arakawa M-135, Exxon L120, Exxon L130, Exxon L140, Exxon E1202, Exxon E1204, and Exxon E2184.

[0013] In some embodiments of the present invention, the active diluent is at least one of 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, polyethylene glycol dimethacrylate, ethoxylated bisphenol A methacrylate, dipentaerythritol hexaacrylate, ethylene glycol dimethacrylate, and hexanediol dimethacrylate.

[0014] In some embodiments of the present invention, the photoinitiator is at least one of Lucirin TPO, Darocur 1173, Irgacure 184, Irgacure 907, Irgacure 369, Irgacure 379, Irgacure 127, and Irgacure 819 from BASF, Germany.

[0015] In some embodiments of the present invention, the UV color paste is at least one of red UR275, red UR236, yellow UY016, yellow UY017, blue US058, blue US237, purple UR256, and purple US061.

[0016] In some embodiments of the present invention, the leveling agent is at least one of German BYK-3455, German BYK-3456, German BYK-3560, German BYK-3565, German BYK-3566, German BYK-3568, German TEGO Rad 2100, German TEGO Rad 2600, German TEGO 100, German TEGO 245, and German TEGO 450.

[0017] In some embodiments of the present invention, the natural flavor is at least one of pine needle oil, wormwood oil, lemon oil, eucalyptus oil, peppermint oil, tea tree oil, cypress leaf oil, osmanthus oil, clove oil, white meadowfoam seed oil, wintergreen oil, bergamot oil, and patchouli oil.

[0018] In some embodiments of the present invention, the UV nail glue further includes a first release film and a second release film, the nail glue body is layered and disposed between the first release film and the second release film, and the thickness of the nail glue body is 300-400 μm.

[0019] To achieve the second object of the present invention, the present invention provides a method for preparing a two-stage UV nail polish as described in any of the above embodiments, comprising the following steps:

[0020] Step 1: Stir and mix the raw materials of the nail glue body evenly;

[0021] Step 2: Extruding the nail glue body between the first release film and the second release film, and partially curing under ultraviolet light;

[0022] Step 3: Roll up the UV nail glue.

[0023] In some embodiments of the present invention, in step 2, the wavelength of the ultraviolet light used for partial curing is 320-400 nm, and the energy of the ultraviolet light is 50-80 J / cm 2 .

[0024] In some embodiments of the present invention, the first release film and the second release film are single-sided release films respectively.

[0025] In some embodiments of the present invention, one of the first release film and the second release film has a thickness of 20 to 30 μm, and the other has a thickness of 70 to 80 μm.

[0026] In some embodiments of the present invention, in step three, a six to twelve inch tube core is used as a support for winding.

[0027] In some embodiments of the present invention, in the step three, the UV nail glue is die-cut after being rolled up.

[0028] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0029] The two-stage UV nail glue of the present invention has the advantages of being healthy and environmentally friendly. Compared with nail polish sold in the form of glue, it reduces the harm of direct contact of solvents with the human body and the damage caused by solvent volatilization, and greatly reduces the pollution to the environment caused by solvent volatilization. The two-stage UV nail glue of the present invention is very convenient to use and can be applied, removed or replaced at any time, saving time and cost, and meeting the demand for style replacement. In addition, the two-stage UV nail glue of the present invention first partially solidifies the UV nail glue, and fits it between the nail and the nail during the nail art. The partially solidified UV nail glue can remain relatively soft and has good filling properties, which better meets the filling of nails of different groups of people. After the bonding, a second UV cross-linking is performed to form more network cross-linking, thereby enhancing the structural strength and improving the bonding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of an embodiment of UV nail glue of the present invention.

[0031] In the figure, 1-first release film, 2-nail glue body layer, 3-second release film.

[0032] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation modes. DETAILED DESCRIPTION

[0033] The embodiment of the present invention provides a two-stage UV nail glue, which can be used to decorate and beautify nails, for example, a crystal clear decorative protective layer can be formed on the nails. Of course, the UV nail glue of the present invention can also be used in other suitable scenes, such as other scenes that require decoration.

[0034] Specifically, the UV nail glue comprises a nail glue body, which is formed by partially curing raw materials including the following components: 100 parts by mass of ultraviolet light-curable acrylic resin, 5-10 parts by mass of tackifying resin, 15-20 parts by mass of reactive diluent, 2-5 parts by mass of photoinitiator, 0.5-2 parts by mass of UV color paste, 3-8 parts by mass of leveling agent, and 0.1-1 parts by mass of natural essence. Among them, the weight ratio of tackifying resin to reactive diluent is 1:(2-3); the reactive diluent has at least two ultraviolet light-curable groups; and the nail glue body is 100% solid and solvent-free.

[0035] The two-stage UV nail glue of the present embodiment has the advantages of health and environmental protection. Compared with the nail polish sold in the form of glue, it reduces the damage caused by direct contact of the solvent with the human body, and greatly reduces environmental pollution. Wherein, the ultraviolet light-cured acrylic resin is a prepolymer formed by polymerization of (methyl) acrylic acid and its esters as monomers, with a low molecular weight and low viscosity. Its molecular chain also contains an incompletely reacted active group, which can further participate in ultraviolet light curing. Compared with the formula using pure monomers, the fluidity of this formula is low, which helps to maintain the shape of the nail glue and improves process convenience. The reactive diluent has at least two ultraviolet light-curable groups, which can participate in UV partial curing and UV full curing, and form a straight chain (or substantially straight chain) cross-linked structure and a network cross-linked structure respectively. The present embodiment adopts ultraviolet light-cured acrylic resin, adds tackifying resin, reactive diluent and photoinitiator, and selects the dosage ratio of components such as suitable ultraviolet light-cured acrylic resin, tackifying resin, reactive diluent, etc. to obtain a glue with optimized performance. During the coating and production process of UV nail glue, the partial curing of UV nail glue can be controlled by adjusting the cumulative light energy to make it as linear cross-linked as possible. This method allows the colloid to remain soft and have good filling properties after the first stage of curing. When performing nail art, the first cross-linked product is attached between the nail art and the nail, and then the second UV cross-linking is performed. By using a multifunctional active diluent as a cross-linking agent, more network cross-links are formed during the second cross-linking, thereby enhancing the structural strength, achieving full filling and improving the bonding strength.

[0036] In some embodiments, among the raw materials of the nail glue body, relative to 100 parts by mass of the UV-curable acrylic resin, the mass of the tackifying resin can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc., the mass of the active diluent can be 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, etc., the mass of the photoinitiator can be 2 parts, 3 parts, 4 parts, 5 parts, etc., and the mass of the UV color paste can be 0.5 parts, 0.6 parts, etc. The mass of natural flavor is 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part, 1.1 part, 1.2 part, 1.3 part, 1.4 part, 1.5 part, 1.6 part, 1.7 part, 1.8 part, 1.9 part, 2 parts, etc. The mass of leveling agent can be 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, etc. The mass of natural flavor is 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part, etc.

[0037] In some embodiments, in the raw materials of the nail glue body, the weight ratio of the tackifying resin to the active diluent can be 1:2, 1:2.5, 1:3, etc.

[0038] In some embodiments, the nail glue body is composed of the following raw materials in parts by weight: 100 parts of UV-curable acrylic resin, 5-10 parts of tackifying resin, 15-20 parts of reactive diluent, 2-5 parts of photoinitiator, 0.5-2 parts of UV color paste, 3-8 parts of leveling agent, and 0.1-1 part of natural flavor. The nail glue body does not contain other components except the above raw materials, and the composition is simpler.

[0039] In some embodiments, the two-stage UV nail glue body is mainly composed of the following raw materials in parts by weight: 100 parts of ultraviolet light curing acrylic resin, 5-10 parts of tackifying resin, 15-20 parts of reactive diluent, 2-5 parts of photoinitiator, 0.5-2 parts of UV color paste, 3-8 parts of leveling agent, and 0.1-1 part of natural flavor. In addition to the above raw materials, the nail glue body may also contain a small amount of auxiliary agents.

[0040] In some embodiments, the UV nail glue of this embodiment does not contain solvent, which means that it is substantially free of solvent, for example, the solvent content is less than 0.1wt%, and residual solvent impurities in some raw materials are not excluded. Solvents include organic solvents, water, etc.

[0041] In some embodiments, the UV-curable acrylic resin is polymerized from (meth) acrylic acid and its ester monomers, and the (meth) acrylic acid and its ester monomers are at least one of acrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, n-butyl (meth) acrylate, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, isobornyl (meth) acrylate, cyclohexyl (meth) acrylate, tridecyl (meth) acrylate, and pentanediol di(meth) acrylate. The above acrylic acid and its ester monomers can be homopolymerized or copolymerized to obtain a UV-curable acrylic resin having UV-curing activity through double bond polymerization, and the molecular weight of the UV-curable acrylic resin can be between 1000 and 5000.

[0042] In some embodiments, (meth)acrylic acid and its ester monomers are at least two of acrylic acid, methyl (meth)acrylate, ethyl (meth)acrylate, isooctyl (meth)acrylate, n-butyl (meth)acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, isobornyl (meth)acrylate, cyclohexyl (meth)acrylate, tridecyl (meth)acrylate, and pentanediol di(meth)acrylate. The performance of the UV-curable acrylic resin can be adjusted by using a variety of (meth)acrylic acid and its ester monomers. For example, the UV-curable acrylic resin can be a copolymer of acrylic acid and isooctyl acrylate, a copolymer of acrylic acid and hydroxypropyl acrylate, a copolymer of butyl acrylate, pentylene glycol diacrylate and acrylic acid, a copolymer of acrylic acid, isooctyl acrylate, butyl acrylate and pentylene glycol diacrylate, a copolymer of acrylic acid, hydroxypropyl acrylate, butyl acrylate and pentylene glycol diacrylate, a copolymer of acrylic acid, isooctyl acrylate, hydroxypropyl acrylate, butyl acrylate and pentylene glycol diacrylate, a copolymer of acrylic acid, hydroxypropyl methacrylate, isooctyl acrylate, cyclohexyl methacrylate, ethyl acrylate and methyl methacrylate, and the like.

[0043] In some embodiments, the UV-curable acrylic resin has the structural formula:

[0044]

[0045] Wherein, m, n and p are respectively positive integers greater than or equal to 0, and at least one of m, n and p is not 0. The ultraviolet light curing acrylic resin can be a copolymer of acrylic acid and hydroxypropyl methacrylate, a copolymer of isooctyl acrylate and cyclohexyl methacrylate, a copolymer of ethyl acrylate and methyl methacrylate, a copolymer of acrylic acid, hydroxypropyl methacrylate, isooctyl acrylate and cyclohexyl methacrylate, a copolymer of acrylic acid, hydroxypropyl methacrylate, ethyl acrylate and methyl methacrylate, a copolymer of isooctyl acrylate, cyclohexyl methacrylate, ethyl acrylate and methyl methacrylate, a copolymer of acrylic acid, hydroxypropyl methacrylate, isooctyl acrylate, cyclohexyl methacrylate, ethyl acrylate and methyl methacrylate, and a copolymer of acrylic acid, hydroxypropyl methacrylate, isooctyl acrylate, cyclohexyl methacrylate, ethyl acrylate and methyl methacrylate, and the like. The above polymer is copolymerized by methacrylic acid (ester) and acrylic acid (ester), and the flexibility and rigidity of the chain segment are moderate, so that the obtained partially cured nail glue body has good flexibility and sufficient mechanical strength, is easy to fill and is not easy to damage.

[0046] In some embodiments, before the nail polish body is partially cured, the viscosity of the mixture of raw materials at 25° C. is 1000 to 2000 cps, which is convenient for coating.

[0047] In some embodiments, the tackifying resin is hydrogenated rosin resin. The polarity of the natural rosin resin is reduced after hydrogenation, so that the nail glue has better oxidation resistance and stability, and the effect of the resin on the yellowing of the glue is reduced. In some embodiments, the tackifying resin is selected from at least one of Eastman Regalite S1100, Eastman Regalite R1090, Eastman Regalite R7125, Eastman Foral 85-E, Eastman Foral 105-E, Eastman Foralyn 90, Eastman Foralyn 110, Arakawa P-90, Arakawa P-100, Arakawa P-140, Arakawa M-90, Arakawa M-100, Arakawa M-135, Exxon L120, Exxon L130, Exxon L140, Exxon E1202, Exxon E1204, and Exxon E2184.

[0048] In some embodiments, the active diluent is at least one of 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, polyethylene glycol dimethacrylate, ethoxylated bisphenol A methacrylate, dipentaerythritol hexaacrylate, ethylene glycol dimethacrylate, and hexanediol dimethacrylate. The active diluent can reduce the viscosity of the nail glue before curing, enhance its fluidity, and facilitate coating; after partial curing, it can form a partially cross-linked product, such as a linear partially cross-linked product, which has good filling properties; after curing, it can form a network cross-linked product, which has good hardness and stickiness.

[0049] In some embodiments, the photoinitiator is at least one of Lucirin TPO, Darocur 1173, Irgacure 184, Irgacure 907, Irgacure 369, Irgacure 379, Irgacure 127, and Irgacure 819 from BASF, Germany. The above photoinitiators have the advantages of high initiation efficiency.

[0050] In some embodiments, the UV color paste is at least one of red UR275, red UR236, yellow UY016, yellow UY017, blue US058, blue US237, purple UR256, and purple US061. The UV color paste pigment is dispersed stably.

[0051] In some embodiments, the leveling agent is at least one of German BYK-3455, German BYK-3456, German BYK-3560, German BYK-3565, German BYK-3566, German BYK-3568, German TEGO Rad2100, German TEGO Rad 2600, German TEGO 100, German TEGO 245, and German TEGO 450. The leveling agent can promote the formation of a flat glue layer on the nail glue body.

[0052] In some embodiments, the natural essence is at least one of pine needle oil, wormwood oil, lemon oil, eucalyptus oil, peppermint oil, tea tree oil, cypress leaf oil, osmanthus oil, clove oil, meadowfoam seed oil, wintergreen oil, bergamot oil, and patchouli oil. The natural essence can give the nail polish a pleasant fragrance.

[0053] In some embodiments, Figure 1As shown, the UV nail glue also includes a first release film 1 and a second release film 3. The nail glue body is layered, that is, a nail glue body layer 2 is formed. The nail glue body layer 2 is arranged between the first release film 1 and the second release film 3. The first release film 1 or the second release film 3 can be peeled off and then the nail glue body layer 2 can be pasted on the nail, which is convenient to use. The thickness of the nail glue body is 300-400 μm, and it has excellent texture and excellent mechanical strength.

[0054] In some embodiments, the method for preparing the UV nail glue described in any of the above embodiments comprises the following steps:

[0055] Step 1: Stir and mix the raw materials of the nail glue body evenly;

[0056] Step 2: squeeze the nail glue body out from the gap between the first release film and the second release film, and partially cure it under ultraviolet light;

[0057] Step 3: Roll up the UV nail glue.

[0058] It can be seen that in this embodiment, the raw materials of the nail glue are squeezed into the gap between the release films by means of the sandwich curing method, and then partially cured. The partially cured nail glue body has a stable shape, which is convenient for die-cutting, easy to package and store after die-cutting, and more convenient to transport. At the same time, the nail glue body is not completely cross-linked,

[0059] In some embodiments, both the first release film and the second release film are single-sided release films, and the release surface of the release film may face the nail glue body.

[0060] In some embodiments, one of the first release film and the second release film has a thickness of 70 to 80 μm and can play a good supporting role, and the other has a thickness of 20 to 30 μm and plays a protective role.

[0061] In some embodiments, in step 3, the six to twelve inch tube core is used as a support for winding. The winding process of this embodiment adopts upper and lower sandwich winding, and the six to twelve inch tube core is used as a support base to roll the coil, which is convenient for die cutting and forming of various nail shapes.

[0062] In some embodiments, in step three, after rolling up, the UV nail glue is die-cut into nail sheets that can fit the nails, so as to facilitate the use of the nail sheets.

[0063] The UV nail polish of the present invention will be further described in detail below through specific embodiments.

[0064] In the following examples and comparative examples, the UV-curable acrylic resin used is a copolymer obtained by copolymerizing acrylic acid, hydroxypropyl methacrylate, isooctyl acrylate, cyclohexyl methacrylate, ethyl acrylate, and methyl methacrylate in an equal molar ratio, and the number average molecular weight is 2000-2500; the tackifying resin is Regalite S1100 from Eastman, USA; the active diluent is a mixture of 1,6-hexanediol diacrylate and polyethylene glycol dimethacrylate (mass ratio 1:1); the photoinitiator is Lucirin TPO from BASF, Germany; the UV color paste is red UR275; the leveling agent is BYK-3455 from BYK, Germany; and the natural flavor is pine needle oil.

[0065] Example 1

[0066] The raw materials of the nail glue body in the two-stage UV nail glue of this embodiment are composed of the following components by mass: 100 parts of ultraviolet light curing acrylic resin; 10 parts of tackifying resin; 20 parts of active diluent; 5 parts of photoinitiator; 1.2 parts of UV color paste; 6 parts of leveling agent; 0.5 parts of natural essence. The viscosity of the above raw material mixture at 25°C is 1800cps.

[0067] The preparation method of the two-stage UV nail glue of this embodiment is as follows: the above raw materials are stirred and mixed evenly, and then squeezed out between the first release film (75 μm) and the second release film (25 μm), and then put into the UV curing box for partial curing, and the UV irradiation energy is controlled to be 70 J / cm 2 , and finally the obtained UV nail glue is rolled up.

[0068] Example 2

[0069] The raw materials of the nail glue body in the two-stage UV nail glue of this embodiment are composed of the following components by mass: 100 parts of ultraviolet light curing acrylic resin; 5 parts of tackifying resin; 15 parts of active diluent; 2 parts of photoinitiator; 1.2 parts of UV color paste; 6 parts of leveling agent; 0.5 parts of natural essence. The viscosity of the above raw material mixture at 25°C is 1500cps.

[0070] The preparation method of the two-stage UV nail polish in this embodiment is the same as that in Example 1.

[0071] Comparative Example 1

[0072] The raw materials of the nail glue body of this comparative example do not contain the component of the tackifying resin, and are composed of the following components by mass: 100 parts of UV-curable acrylic resin; 20 parts of reactive diluent; 5 parts of photoinitiator; 1.2 parts of UV color paste; 6 parts of leveling agent; 0.5 parts of natural flavor. The viscosity of the above raw material mixture at 25°C is 1000cps.

[0073] The preparation method of the nail polish in this comparative example is the same as that in Example 1.

[0074] Comparative Example 2

[0075] The raw materials of the nail glue body of this comparative example have a lower amount of tackifying resin and a higher amount of active diluent, and are composed of the following components by mass: 100 parts of UV-curable acrylic resin; 5 parts of tackifying resin; 20 parts of active diluent; 5 parts of photoinitiator; 1.2 parts of UV color paste; 6 parts of leveling agent; 0.5 parts of natural flavor. The viscosity of the raw material mixture at 25°C is 1200cps.

[0076] The preparation method of the nail polish in this comparative example is the same as that in Example 1.

[0077] Comparative Example 3

[0078] The raw materials of the nail glue body of this comparative example have a higher amount of tackifying resin and a lower amount of active diluent, and are composed of the following components by mass: 100 parts of UV-curable acrylic resin; 10 parts of tackifying resin; 15 parts of active diluent; 5 parts of photoinitiator; 1.2 parts of UV color paste; 6 parts of leveling agent; 0.5 parts of natural flavor. The viscosity of the raw material mixture at 25°C is 2000cps.

[0079] The preparation method of the nail polish in this comparative example is the same as that in Example 1.

[0080] The performance of the two-stage UV nail glue in the embodiment and the comparative example was tested.

[0081] Test items and test methods:

[0082] The thickness test is carried out using a digital thickness gauge, referring to GB / T7125-2014;

[0083] The initial adhesion of the inclined surface is tested by using the initial adhesion tester of the inclined surface rolling ball method, referring to GB / T4852-2002;

[0084] The ring initial adhesion is tested by a computerized tension and pressure testing machine, referring to GB / T31125-2014;

[0085] The steel plate peeling force is tested using a computerized tension and pressure testing machine, referring to GB / T2792-2014;

[0086] The shear force is tested using a computerized tension and compression testing machine, referring to GB / T33332-2016;

[0087] The holding force is tested on UV fully cured samples using a holding force test chamber, referring to GB / T4851-2014.

[0088] The test results are shown in the following table.

[0089]

[0090] As can be seen from the above table, Example 1 uses 10 parts of tackifying resin, 20 parts of active diluent and 100 parts of UV-curable acrylic resin to form a nail glue body with high initial viscosity and good filling properties, which can meet the filling of different types of nails. Example 2 uses 5 parts of tackifying resin, 15 parts of active diluent and 100 parts of UV-curable acrylic resin to form a nail glue body with high peeling force and high shear force, which can meet the basic filling performance of nail glue, and at the same time improves the stickiness, which can reduce the probability of nail glue falling off and improve the durability of use. It can be seen that Examples 1 and 2 within the scope of the present invention both have good initial viscosity, filling properties and stickiness, among which Example 1 has better filling properties and Example 2 has better anti-falling properties. The amount of each component in the formula can be adjusted within the scope of the present invention to obtain a series of products that meet the requirements of different users.

[0091] Comparative Example 1 does not contain a tackifying resin relative to Example 1. The nail glue of Comparative Example 1 has low initial adhesion, low peeling force and shear force, low stickiness, and is not practical.

[0092] Comparative Example 2 uses 5 parts of tackifying resin, 20 parts of reactive diluent and 100 parts of UV-curable acrylic resin. The tackifying resin is insufficient and the reactive diluent is excessive, so that the partially or fully cured nail glue forms an over-crosslinked network, which is not conducive to filling and maintaining adhesion.

[0093] Comparative Example 3 uses 10 parts of tackifying resin and 15 parts of active diluent in combination with 100 parts of UV-curable acrylic resin, resulting in insufficient crosslinking after partial or complete curing, causing the product's adhesion to fail to meet the requirements.

[0094] Finally, it should be emphasized that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A two-stage UV nail polish, characterized in that The invention comprises a nail glue body, wherein the nail glue body is formed by partially solidifying raw materials including the following components: 100 parts by weight of UV-curable acrylic resin, 5 to 10 parts by weight of tackifying resin, 15 to 20 parts by weight of active diluent, 2 to 5 parts by weight of photoinitiator, UV color paste 0.5-2 parts by mass, 3 to 8 parts by weight of leveling agent, 0.1-1 parts by weight of natural flavor; Wherein, the weight ratio of the tackifying resin to the active diluent is 1:(2-3); The reactive diluent has at least two UV-curable groups; The nail glue body is 100% solid and solvent-free.

2. A two-stage UV nail polish according to claim 1, characterized in that: The UV-curable acrylic resin is polymerized from (meth)acrylic acid and its ester monomers, wherein the (meth)acrylic acid and its ester monomers are at least one of acrylic acid, methyl (meth)acrylate, ethyl (meth)acrylate, isooctyl (meth)acrylate, n-butyl (meth)acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, isobornyl (meth)acrylate, cyclohexyl (meth)acrylate, tridecyl (meth)acrylate, and pentanediol di(meth)acrylate.

3. A two-stage UV nail polish according to claim 2, characterized in that: The (meth)acrylic acid and its ester monomers are at least two of acrylic acid, methyl (meth)acrylate, ethyl (meth)acrylate, isooctyl (meth)acrylate, n-butyl (meth)acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, isobornyl (meth)acrylate, cyclohexyl (meth)acrylate, tridecyl (meth)acrylate, and pentanediol di(meth)acrylate.

4. A two-stage UV nail polish according to claim 2, characterized in that The structural formula of the UV-curable acrylic resin is: In the formula, m, n and p are positive integers greater than or equal to 0, and at least one of m, n and p is not 0.

5. A two-stage UV nail polish according to any one of claims 1 to 4, characterized in that: Before the nail polish body is partially solidified, the viscosity of the mixture of the raw materials at 25° C. is 1000 to 2000 cps.

6. A two-stage UV nail polish according to any one of claims 1 to 4, characterized in that: The tackifying resin is hydrogenated rosin resin; the tackifying resin is selected from at least one of American Eastman Regalite S1100, American Eastman Regalite R1090, American Eastman Regalite R7125, American Eastman Foral 85-E, American Eastman Foral 105-E, American Eastman Foralyn 90, American Eastman Foralyn 110, Japanese Arakawa P-90, Japanese Arakawa P-100, Japanese Arakawa P-140, Japanese Arakawa M-90, Japanese Arakawa M-100, Japanese Arakawa M-135, American Exxon L120, American Exxon L130, American Exxon L140, American Exxon E1202, American Exxon E1204, and American Exxon E2184; The active diluent is at least one of 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, polyethylene glycol dimethacrylate, ethoxylated bisphenol A methacrylate, dipentaerythritol hexaacrylate, ethylene glycol dimethacrylate and hexanediol dimethacrylate.

7. A two-stage UV nail polish according to any one of claims 1 to 4, characterized in that: The photoinitiator is at least one of Lucirin TPO, Darocur 1173, Irgacure 184, Irgacure 907, Irgacure 369, Irgacure 379, Irgacure 127 and Irgacure 819 from BASF, Germany. The UV color paste is at least one of red UR275, red UR236, yellow UY016, yellow UY017, blue US058, blue US237, purple UR256, and purple US061; The leveling agent is at least one of German BYK-3455, German BYK-3456, German BYK-3560, German BYK-3565, German BYK-3566, German BYK-3568, German TEGO Rad 2100, German TEGORad 2600, German TEGO 100, German TEGO 245, and German TEGO 450; The natural essence is at least one of pine needle oil, wormwood oil, lemon oil, eucalyptus oil, peppermint oil, tea tree oil, cypress leaf oil, osmanthus oil, clove oil, meadowfoam seed oil, wintergreen oil, bergamot oil and patchouli oil.

8. A two-stage UV nail polish according to any one of claims 1 to 4, characterized in that It also includes a first release film and a second release film. The nail glue body is layered and arranged between the first release film and the second release film. The thickness of the nail glue body is 300-400 μm.

9. A method for preparing a two-stage UV nail glue according to any one of claims 1 to 8, characterized in that The following steps are involved: Step 1: Stir and mix the raw materials of the nail glue body evenly; Step 2: Extruding the nail glue body between the first release film and the second release film, and partially curing it under ultraviolet light; Step 3: Roll up the UV nail glue.

10. The preparation method according to claim 9, characterized in that: In the step 2, the wavelength of the ultraviolet light used for partial curing is 320-400 nm, and the energy of the ultraviolet light is 50-80 J / cm 2 ; In the step 2, the first release film and the second release film are single-sided release films; one of the first release film and the second release film has a thickness of 70 to 80 μm, and the other has a thickness of 20 to 30 μm; In the step three, the six to twelve-inch tube core is used as a support for rolling; after rolling, the UV nail glue is die-cut.

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