Craft dipping solution and method for manufacturing craft products

Abstract

To provide a dip liquid for crafts capable of readily forming a thick cured film.SOLUTION: A craft dip liquid that can form a film on the inside of an annular frame by dipping the frame and pulling it up is made of an ultraviolet curable resin composition. With this configuration, a thicker cured film can be formed compared to conventional craft dip liquids dissolved in organic solvents. Therefore, it is possible to omit the reinforcing work after forming the cured film or to reduce the number of times of the reinforcing work compared to the conventional method.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a dipping solution for crafts that forms a curable film within a frame by immersing the annular frame in the solution and pulling it out. [Background Art]

[0002] A technique called dip art is known, in which a frame immersed in a craft dipping solution is pulled up, and the film formed inside the frame is cured to form a shape imitating petals or leaves, and a craft product is manufactured by combining a plurality of such shaped parts. A conventional craft dipping solution is a solution obtained by dissolving a synthetic resin in an organic solvent. When the frame is immersed in the dipping solution, pulled up, and left at room temperature, the organic solvent volatilizes while a film is formed inside the frame, thereby forming a cured film (for example, Patent Document 1). [Prior Art Literature] [Patent Literature]

[0003] [Patent Document 1] Japanese Patent No. 3253139 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] A cured film obtained with a conventional craft dipping solution has a small film thickness, and in many cases, after the cured film is formed, a reinforcing work of coating with a reinforcing agent to increase the film thickness is required.

[0005] The present invention has been made in view of such current circumstances, and an object of the present invention is to provide a dipping solution for crafts that can easily form a thicker cured film than conventional ones, and a method for producing a craft product. [Means for Solving the Problem]

[0006] The present invention relates to a craft dipping liquid that forms a curable film on the inside of an annular frame by immersing and withdrawing the frame, characterized in that it is an ultraviolet-curable resin composition that can be cured in a film state on the inside of the frame by irradiating it with ultraviolet light after the immersed frame has been withdrawn.

[0007] This craft dipping solution allows for the formation of a thicker, more robust cured film compared to conventional craft dipping solutions. This is thought to be because UV-curable resin compositions generally do not require solvents, preventing film shrinkage during curing. Therefore, using the craft dipping solution of the present invention to form a cured film on a frame makes it easier to omit reinforcement work on the cured film. Furthermore, even when reinforcement work is performed to increase the thickness of the cured film, the number of times the cured film is coated with a reinforcing agent can be reduced compared to conventional configurations. Furthermore, conventional craft dipping solutions cannot be used as reinforcing agents for cured films because, when a dried cured film is dipped into them, the cured film dissolves in the organic solvent. In contrast, with the craft dipping solution of the present invention, if a UV-cured film is dipped into the solution and then removed, UV light is re-irradiated, allowing the cured film to be coated with the craft dipping solution adhering to the surface, thereby increasing the film thickness. In other words, the dipping solution of the present invention can also be used as a reinforcing agent for cured films. Therefore, according to the present invention, there is no need to prepare a reinforcing agent separately from the craft dipping solution.

[0008] Another aspect of the present invention is a method for manufacturing a craft product, comprising a film-forming step of immersing an annular frame in a craft dipping liquid and then lifting it out to form a film on the inside of the frame, and a curing step of curing the film, wherein the craft dipping liquid is an ultraviolet-curable resin composition, and in the curing step, ultraviolet light is irradiated onto the film formed on the inside of the frame to cure the film.

[0009] This method of manufacturing craftsmanship allows for the formation of a thicker, more robust cured film compared to conventional methods using solvent-based craft dipping solutions, thus eliminating or reducing the need for reinforcing the cured film. [Effects of the Invention]

[0010] As described above, according to the present invention, a thicker cured film can be easily formed compared to using conventional craft dipping liquids, thus facilitating the manufacture of craft products using craft dipping liquids. [Modes for carrying out the invention]

[0011] The craft dipping solution of the present invention is a liquid UV-curable resin composition that hardens upon irradiation with ultraviolet light. The craft dipping solution of the present invention comprises at least a polymerizable compound and a photoreaction initiator.

[0012] The polymerizable compound contained in the craft dipping solution of the present invention can be either a polymerizable compound that undergoes photoradical polymerization or a polymerizable compound that undergoes photocationic polymerization, but a photoradical polymerizable compound is preferable. This is because photoradical polymerizable compounds have a relatively faster curing rate.

[0013] Examples of polymerizable compounds that undergo photoradical polymerization include (meth)acrylate compounds, styrene monomers, vinyl monomers, and allyl compounds. Examples of (meth)acrylate compounds include (meth)acrylate monomers, (meth)acrylate oligomers, and acrylate-modified liquid rubbers. Examples of (meth)acrylate oligomers include urethane (meth)acrylate oligomers, polyester (meth)acrylate oligomers, and epoxy (meth)acrylate oligomers. Examples of vinyl monomers include vinylpyrrolidone and diallyl phthalate. Multiple types of these photoradical polymerizable compounds can be combined.

[0014] Examples of polymerizable compounds that undergo photocationic polymerization include cyclic ethers (epoxides and oxetanes, etc.), ethylenically unsaturated compounds (vinyl ethers and styrenes, etc.), bicycloalthoesters, spiroalthocarbonates, and spiroalthoesters. Known epoxides can be used, including aromatic epoxides, alicyclic epoxides, and aliphatic epoxides. Known cationic polymerizable monomers can be used, including aliphatic monovinyl ethers, aromatic monovinyl ethers, polyfunctional vinyl ethers, styrenes, and cationic polymerizable nitrogen-containing monomers. Multiple types of these can be combined.

[0015] The type of photoreaction initiator contained in the craft dip solution of the present invention is not particularly limited, and one suitable for polymerizable compounds can be selected. Examples of photoreaction initiators for polymerizable compounds undergoing radical polymerization include photoradical polymerization initiators and thermal radical polymerization initiators. Examples of photoradical polymerization initiators include alkylphenone systems of 1-hydroxycyclohexylphenyl ketone and 2-hydroxy-2-methyl-1-phenyl-1-propanone, acylphosphine oxide systems of 2,4,6-trimethylbenzoyldiphenylphosphine oxide, titanocene systems, oxime ester systems, oxyphenyl acetate systems, benzoin systems, benzophenone systems, thioxanthone systems, etc. Examples of thermal radical polymerization initiators include 2,2'-azobisisobutyronitrile, benzoyl peroxide, tert-butyl hydroperoxide, cumene hydroperoxide, di-tert-butyl peroxide, dicumyl peroxide, etc. The curable composition may contain one or more radical polymerization initiators.

[0016] Examples of photocatalytic initiators for polymerizable compounds undergoing cationic polymerization include photocatalytic cationic polymerization initiators and thermal cationic polymerization initiators. Examples of photocatalytic cationic polymerization initiators include arylsulfonium salts, diarylsulfonium salts, triarylsulfonium salts, phenacylsulfonium salts, alkylbenzylsulfonium salts, diaryliodonium salts, and sulfonyldiazomethane. Examples of thermal cationic polymerization initiators include benzylsulfonium salts, benzylammonium salts, phosphonium salts, arylsulfonium salts, diarylsulfonium salts, and triarylsulfonium salts. The curable composition may contain one or more cationic polymerization initiators. The content of the photocatalytic initiator is not particularly limited, but it is preferably 0.5% by weight or more.

[0017] According to the inventor's research, the higher the viscosity of the dipping liquid for crafts in this invention, the thicker the cured film tends to be. Therefore, it is suggested to adjust the viscosity according to the desired thickness of the cured film. However, according to the inventor's research, if the viscosity of the dipping liquid for crafts in this invention exceeds 30 Pa·s at 25°C, irregularities due to liquid accumulation become noticeable on the surface of the cured film, reducing its smoothness and degrading the aesthetic appearance of the cured film. Therefore, it is desirable that the viscosity of the dipping liquid for crafts in this invention be 30 Pa·s or less at 25°C.

[0018] The dipping solution for crafts of the present invention preferably contains a surface tension modifier. According to the inventor's research, when a surface tension modifier is included, the uncured film formed on the frame can be held relatively stably. Therefore, with this configuration, it becomes easier to form a cured film on a relatively large frame. Furthermore, with this configuration, the uncured film can be held on the frame for a relatively long time, so even when the intensity of the irradiated ultraviolet light is weak and curing takes time, it becomes easier to cure the film held on the frame before it breaks. The surface tension modifier to be included in the dipping solution for crafts of the present invention is not particularly limited, but specific examples include polyether-modified silicone oil, polymethylsiloxane group-containing acrylate compounds, and fluorine-based surfactants. Multiple types of these can be combined. The amount of surface tension modifier to be included in the dipping solution for crafts of the present invention is not particularly limited, but the higher the amount, the more stable the uncured film tends to be.

[0019] The surface tension modifier to be included in the dipping solution for crafts of the present invention preferably contains polyether-modified silicone oil. According to the inventor's research, as the content of the surface tension modifier in the dipping solution for crafts of the present invention increases, the cured film tends to become cloudy and its transparency decreases. However, polyether-modified silicone oil has a strong effect in stabilizing the film even in relatively small amounts, so compared to other surface tension modifiers, it is less likely to reduce the transparency of the cured film. If the inherent transparency of the cured film is high, it becomes easier to adjust the color and transparency of the cured film by mixing in pigments or dyes or applying paint. According to the inventor's research, the content of polyether-modified silicone oil is preferably less than 1% by weight, and more preferably less than 0.6% by weight. If the content is 1% by weight or more, the cured film is prone to clouding, but if the content is less than 0.6% by weight, clouding of the cured film can be reliably prevented. On the other hand, the content of polyether-modified silicone oil is preferably 0.05% by weight or more, and more preferably 0.2% by weight or more. If the content is 0.05% by weight or more, the uncured film can be stably held in the frame, and if the content is 0.2% by weight or more, the uncured film held in the frame can be maintained for a time sufficient to ensure curing by ultraviolet light.

[0020] In the dipping solution for crafts of the present invention, air comes into contact with both the front and back surfaces of the film during curing. Therefore, if the polymerizable compound contains a (meth)acrylate-based compound, the curing reaction is easily inhibited by oxygen. If the curing reaction is insufficient due to oxygen inhibition, the surface of the cured film becomes sticky and unpleasant to the touch. While the curing reaction can be advanced without oxygen inhibition by irradiating with strong ultraviolet light, strong ultraviolet light has a strong adverse effect on the human body, and irradiation equipment is expensive, making it difficult to use in crafts. For this reason, if the dipping solution for crafts of the present invention contains a (meth)acrylate-based compound as a polymerizable compound, it is desirable to further contain polythiol. This is because the effect of oxygen inhibition can be reduced by containing polythiol. According to the inventor's research, it is desirable to contain 3% by weight or more of polythiol, and more preferably 4% by weight or more. When it contains 3% by weight or more, the curing reaction can proceed sufficiently even at the level of ultraviolet irradiation irradiated by an ultraviolet irradiation device for crafts, and the stickiness of the cured film can be generally suppressed. When it contains 4% by weight or more, the stickiness of the cured film can be reliably prevented. The polythiol contained in the craft dip liquid of the present invention is not particularly limited, but specific examples include mercapto group-substituted alkyl compounds such as dimercaptobutane and trimercaptohexane, mercapto group-substituted allyl compounds such as dimercaptobenzene, polyhydric alcohol esters such as thioglycolic acid and thiopropionic acid such as trimethylolpropane-tris-(β-thiopropinate), tris-2-hydroxyethyl-isocyanurate-tris-β-mercaptopropionate, pentaerythritoltetrakis(β-thiopropionate), and 1,8-dimercapto-3,6-dioxaoctane, 1,11-dimercapto3,69-Trioxadodecane, diethylene glycol bisthioglycolate, triethylene glycol bisthioglycolate, tetraethylene glycol bisthioglycolate, pentaethylene glycol bisthioglycolate, hexaethylene glycol bisthioglycolate, octaethylene glycol bisthioglycolate, dodecane ethylene glycol bisthioglycolate, diethylene glycol bis(3-mercaptopropionate), triethylene glycol bis(3-mercaptopropionate), tetraethylene glycol bis(3-mercaptopropionate) Bis(3-mercaptopropionate), pentaethylene glycol bis(3-mercaptopropionate), hexaethylene glycol bis(3-mercaptopropionate), octaethylene glycol bis(3-mercaptopropionate), dodecaneethylene glycol bis(3-mercaptopropionate), diethylene glycol bis(3-mercaptobutyrate), triethylene glycol bis(3-mercaptobutyrate), tetraethylene glycol bis(3-mercaptobutyrate), pentaethylene glycol bis(3-mercaptobutyrate), Xaethylene glycol bis(3-mercaptobutyrate), octaethylene glycol bis(3-mercaptobutyrate), dodecaneethylene glycol bis(3-mercaptobutyrate), polyethylene glycol bisthioglycolate, polyethylene glycol bis(3-mercaptopropionate), polyethylene glycol bis(3-mercaptobutyrate), polypropylene glycol bisthioglycolate, polypropylene glycol bis(3-mercaptopropionate), polypropylene glycol bis(3-mercaptobutyrate), 1,4-Bis(3-mercaptobutyryloxy)butane, ethylene oxide adduct of trimethylolpropane-tris-(3-mercaptopropinate), ethylene oxide adduct of tris-[(3-mercaptopropionyloxy)-ethyl]-isocyanurate, ethylene oxide adduct of pentaerythritoltetrakis(3-mercaptopropionate), ethylene oxide adduct of pentaerythritoltetrakis(3-mercaptobutyrate), ethylene oxide adduct of trimethylolethanetris(3-mercaptobutyrate), 1,Reaction products of alkylene oxide adducts of polyhydric alcohols such as ethylene oxide adducts of 8-dimercapto-3,6-dioxaoctane, 1,3,5-tris(3-mercaptobutyloxyethyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, dipentaerythritol hexakis(3-mercaptopropionate), and hydrogen sulfide are mentioned; in addition, 1,8-dimercapto-3,6-disulfideoctane, triazinethiol, and the like can be mentioned. A plurality of these may be used in combination.,

[0021] The dip coating liquid for crafts of the present invention may contain various additives other than those described above. Specifically, examples of other additives include pigments, dyes, ultraviolet absorbers, polymers (prepolymers), polymerization inhibitors, and the like. The pigments are not particularly limited, and examples thereof include diketopyrrolopyrrole pigments, azo pigments such as condensed azo pigments, perylene·perinone pigments, dioxazine pigments, anthraquinone pigments, titanium oxide pigments, carbon black pigments, and the like. A plurality of these may be used in combination.

[0022] The dyes are not particularly limited, and may be dyes having any basic skeleton (color-developing moiety) such as azo dyes, metal complex azo dyes, anthraquinone dyes, triarylmethane dyes, xanthene dyes, cyanine dyes, indigo dyes, naphthoquinone dyes, quinoneimine dyes, methine dyes, phthalocyanine dyes, and the like. Further, the above dyes may be any classified dyes such as acid dyes having an anionic substituent, basic dyes having a cationic substituent, and the like. A plurality of these may be used in combination.

[0023] The ultraviolet absorber is not particularly limited, and at least one selected from benzotriazole-based ultraviolet absorbers, triazine-based ultraviolet absorbers, salicylic acid derivative-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, and the like can be used.

[0024] Examples of polymers (prepolymers) compatible with acrylic monomer compounds include allyl ester monomers and copolymers, (meth)acrylic ester monomers and copolymers, styrene (meth)acrylate copolymers, polyvinyl chloride-vinyl acetate copolymers, polyvinyl acetate, vinyl acetate (meth)acrylate copolymers, polydiallyl phthalate, ethylene-vinyl acetate copolymers, polyester polymers and prepolymers, epoxy resins, petroleum resins, rosin and derivative resins thereof, styrene-maleic acid resins, and the like. A plurality of these may be used in combination.

[0025] The polymerization inhibitor is not particularly limited, and examples thereof include dibutylhydroxytoluene, 4-methoxyphenol, 4-dimethyl-6-t-butylphenol, 2-hydroxy-1,4-naphthoquinone, 4-methoxy-1-naphthol, 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di-tert-pentylphenyl acrylate, 2-tert-butyl-4-methyl-6-(2-hydroxy-3-tert-butyl-5-methylbenzyl)phenyl acrylate, 2,2-bis{[3-(dodecylthio)-1-oxopropoxy]methyl}propane-1,3-diylbis[3-(dodecylthio)propionate], and the like. A plurality of these may be used in combination.

[0026] The dip solution for crafts of the present invention can be produced by mixing the above components at ordinary temperature.

[0027] The method for producing a craft article of the present invention is characterized by comprising: a film forming step of immersing an annular frame body in the dip solution for crafts of the present invention and pulling up the frame body to form a film inside the frame body; and a curing step of irradiating the film formed inside the frame body with ultraviolet rays to cure the film.

[0028] The frame used to form the hardened film can be the same frame used in conventional craft dipping solutions. Specifically, a frame with a handle formed by bending and curving metal or resin wire into a ring shape can be suitably used. The shape of the frame is not particularly limited as long as it is ring-shaped, and the size of the frame is also acceptable as long as it is capable of forming the film.

[0029] In the method for manufacturing craft products of the present invention, the ultraviolet light irradiated in the curing process is not particularly limited as long as it has an intensity and wavelength that can cure the craft dip liquid. According to the inventor's research, in the curing process of the present invention, the film can be completely cured by ultraviolet irradiation for about one minute. Conventional craft dip liquids require a drying time of several tens of minutes to completely cure the film, so according to the present invention, a cured film can be obtained in a shorter time than conventional methods. Furthermore, since the craft dip liquid of the present invention does not require organic solvents, it has the advantage of reducing adverse effects on the human body and eliminating the risk of fire compared to conventional configurations.

[0030] The cured film formed by the curing process according to the present invention is thicker than the cured film formed using conventional craft dipping solutions. This is because conventional craft dipping solutions are mostly volatile organic solvents, whereas the craft dipping solution of the present invention contains little to no volatile components and does not shrink during curing. Thus, the method for manufacturing craft products according to the present invention yields a thicker cured film compared to conventional methods, making it possible to omit reinforcement work on the cured film in many cases. Furthermore, even when reinforcement work is performed to increase the thickness of the cured film, the number of times the cured film is coated with a reinforcing agent can be reduced compared to conventional methods because the base cured film is thick.

[0031] In the method for manufacturing craftwork of the present invention, when a reinforcing process is performed by coating with a reinforcing agent after the formation of a hardened film, the craft dip liquid used to form the hardened film can be used as the reinforcing agent. That is, by immersing the frame on which the hardened film has been formed in the craft dip liquid again, and then irradiating it with ultraviolet light after removing it, the thickness of the hardened film can be increased by hardening the craft dip liquid adhering to the surface of the hardened film. Conventional craft dip liquids cannot be used as a reinforcing agent for hardened films because the hardened film dissolves in the organic solvent when the hardened film is re-immersed in the craft dip liquid. However, the craft dip liquid of the present invention has the advantage of being usable as a reinforcing agent for hardened films as described above.

[0032] In the method for manufacturing craftwork of the present invention, the frame on which a hardened film has been formed by the film-forming and hardening steps can be used in craftwork by existing dip art techniques. For example, by shaping the frame or coloring the hardened film, it can be molded into shapes that resemble flower petals or leaves, and by combining multiple such frames, craftwork that imitates plants can be manufactured. [Examples]

[0033] The present invention will be specifically described below with reference to examples. However, the present invention is not limited to the configurations of the following examples and can be modified as appropriate without altering the spirit of the invention.

[0034] <Examples 1-10> The dipping solutions for crafts in Examples 1 to 10 were prepared by mixing each of the components shown in Table 1 in the quantities shown in Table 1.

[0035] [Table 1] UF-8001B: Urethane acrylate oligomer (manufactured by Kyoeisha Chemical Co., Ltd.) UA-H-B55: Urethane acrylate oligomer (manufactured by Alpha Kaken) PDBE-200A: Ethylene oxide-modified bisphenol A dimethacrylate (manufactured by Nippon Oil & Fats Co., Ltd.) HPMA: Hydroxypropyl methacrylate A-BPE-4: Ethylene oxide-modified bisphenol A diacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd.) IBXA: Isovonyl acrylate M-305: Pentaerythritol tetraacrylate (manufactured by Toagosei) Omirad TPO:2,4,6-trimethylbenzoyldiphenylphosphine oxide (manufactured by Toyotsu Chemiplus) SH-28: Polyether-modified silicone oil (manufactured by Toray Dow Corning) BYK-3500: Acrylic group-containing polyether-modified polydimethylsiloxane (manufactured by BIC Chemie) EBECRYL350: Silicone diacrylate (manufactured by Daicel Ornex) PEMP: Pentaerythritol tetrakis (3-mercaptopropionate, manufactured by SC Organic Chemicals) DAP-A: Polydiallyl phthalate (manufactured by Osaka Soda) Toadip: No.2 Clear (Made by Toupe)

[0036] <Comparative Example 1> A commercially available craft dipping solution (Toa Dip, color "Clear," manufactured by Toupe Co., Ltd.) was used as the comparative example craft dipping solution. This craft dipping solution is a solution obtained by dissolving cotton acetate in an organic solvent.

[0037] <Evaluation Test 1> The viscosity of each dipping solution for Examples 1-10 and the Comparative Example was measured at 25°C using a Brookfield viscometer. The results are shown in Table 2. As shown in Table 2, the dipping solutions for Examples 1-10 showed a wide range of viscosities, from less than 1 / 10 to more than 3 times the viscosity of the dipping solution for the Comparative Example.

[0038] [Table 2]

[0039] <Evaluation Test 2> The surface tension of each craft dipping solution in Examples 1-10 and the comparative example was measured at 25°C. A Dunouy surface tension tester 514-B2 (manufactured by Ito Seisakusho Co., Ltd.) was used for the measurements. The results are shown in Table 2. As shown in Table 2, the surface tension of most craft dipping solutions was around 30 dyn / cm, but the craft dipping solution in Example 10, which did not contain a surface tension modifier, had a surface tension of 36.7 dyn / cm, which was significantly higher than the others.

[0040] <Evaluation Test 3> A rod-shaped handle and a 15mm diameter ring-shaped frame were fabricated by bending and curving a 1mm diameter aluminum wire. The frame was immersed in each of the craft dipping solutions from Examples 1 to 10, and after being removed, it was held still. The duration of the film formed on the inside of the frame was measured under non-ultraviolet light conditions. Since the film can be reliably cured with ultraviolet light if it lasts for 60 seconds or more, the measurement was stopped at 60 seconds. The results are shown in Table 2. As shown in Table 2, a film was formed on the inside of the frame after removal in all of the craft dipping solutions from Examples 1 to 10. However, in the craft dipping solution of Example 10, which did not contain a surface tension modifier, the film was maintained for only 1 second. In contrast, in the craft dipping solutions of Examples 1 to 9, which contained a surface tension modifier, the film was maintained for 40 seconds or more. This result suggests that the inclusion of a surface tension modifier can stabilize the film before curing.

[0041] Furthermore, in Example 8, which used silicon diacrylate (EBECRYL350) as a surface tension modifier, and Example 9, which used acrylic group-containing polyether-modified polydimethylsiloxane (BYK-3500), the film was maintained for 45-50 seconds when the surface tension modifier content was approximately 1.5% by weight. In contrast, in Example 2, which used polyether-modified silicone oil (SH-28) as a surface tension modifier, the film was maintained for 40 seconds with a content of approximately 0.05% by weight or more. This result suggests that when polyether-modified silicone oil is used as a surface tension modifier, the uncured film can be stabilized with a lower content than other surface tension modifiers. In addition, in Examples 1, 3-7, which contained approximately 0.2% by weight or more of polyether-modified silicone oil as a surface tension modifier, the film was maintained for 60 seconds or more. This result suggests that if the polyether-modified silicone oil content is 0.2% by weight or more, the uncured film can be maintained on the frame for a time sufficient for reliable curing by ultraviolet light.

[0042] <Test sample> The frames used in Evaluation Test 3 were immersed in the craft dip solutions of Examples 1 to 10, and after being removed, the films formed on the inside of the frames were irradiated with ultraviolet light for 120 seconds. The ultraviolet irradiation was performed using a craft ultraviolet irradiation device (UV-LED Handy Light 3: manufactured by Padico Corporation), irradiating with ultraviolet light at wavelengths of 365 nm and 405 nm. As a result, the craft dip solutions of Examples 1 to 9 were able to harden the films on the inside of the frames. These hardened films were used as test samples for the following evaluation tests. However, with the craft dip solution of Example 10, the film broke before it could harden, and a hardened film could not be obtained. This result suggests that when the film is relatively unstable, it is necessary to irradiate it with stronger ultraviolet light to harden the film in a shorter time.

[0043] The above frame was immersed in the comparative example's craft dipping solution, removed, and dried at room temperature for 30 minutes to harden the inner film of the frame. The resulting hardened film was used as a comparative test sample.

[0044] <Evaluation Test 4> The film thickness in the central part of the frame was measured using a micrometer for the test samples obtained from Examples 1 to 9 and the test sample obtained from the comparative example. The results are shown in Table 2. As shown in Table 2, the film thickness of the test samples obtained from Examples 1 to 9 was 3 to 13 times greater than that of the test sample obtained from the comparative example. This result suggests that the craft dipping liquid of the present invention yields a thicker cured film compared to conventional craft dipping liquids. Furthermore, as shown in Table 1, the film thickness of the test samples obtained from Examples 1 to 9 tended to increase with increasing viscosity of the craft dipping liquid. This result suggests that the thickness of the cured film can be adjusted by changing the viscosity of the craft dipping liquid.

[0045] <Evaluation Test 5> The surface smoothness of the test samples obtained from Examples 1 to 9 and the test samples obtained from the comparative examples was evaluated visually on the following three-point scale. ○: The unevenness is not noticeable. △: The unevenness is slightly noticeable. ×: The uneven surface is noticeable. The results are shown in Table 2. As shown in Table 2, in the test sample according to Example 3, which had the highest viscosity of 33 Pa·s, unevenness due to liquid pooling was noticeable on the surface of the cured film, and the smoothness was rated low. In the test samples according to the other examples with viscosities of 0.66 to 29 Pa·s, unevenness such as liquid pooling and wrinkles was not noticeable, and the smoothness was rated high in all cases. This result suggests that the craft dip liquid of the present invention can produce a cured film with high smoothness when the viscosity is 30 Pa·s or less.

[0046] <Evaluation Test 6> The transparency of the cured film was visually evaluated in the following three stages for the test samples obtained from Examples 1 to 9 and the test samples obtained from the comparative examples. ○: No turbidity △: Slightly cloudy ×: Very cloudy The results are shown in Table 2. As shown in Table 2, in the test samples of Examples 1 to 6, in which the surface tension modifier content was less than 0.6% by weight, no turbidity was observed in the cured film, and the transparency was highly rated. In the test samples of Examples 7 to 9, in which the surface tension modifier content was 1% by weight or more, white turbidity was observed in the cured film, and the transparency was low or medium rated. This result suggests that, with the craft dip liquid of the present invention, the transparency of the resulting cured film decreases as the surface tension modifier content increases. Furthermore, this result suggests that when using polyether-modified silicone oil as a surface tension modifier, it is desirable to keep the polyether-modified silicone oil content at least less than 1% by weight, and preferably less than 0.6% by weight.

[0047] <Evaluation Test 7> The cured films of the test samples obtained from Examples 1 to 9 and the test samples obtained from the comparative examples were evaluated by touch to determine the degree of stickiness of the surface, using the following three-stage evaluation system. ○: Not sticky △: Slightly sticky ×: Sticky The results are shown in Table 2. As shown in Table 2, in the test sample according to Example 4, which contained approximately 2% by weight of polythiol, stickiness was observed on the surface of the cured film. In addition, in the test sample according to Example 8, which contained approximately 3% by weight of polythiol, slight stickiness was observed on the surface of the cured film. Furthermore, in the test samples according to Examples 1-3, 5-7, and 9, which contained 4% by weight or more of polythiol, no stickiness was observed on the surface of the cured film. These results suggest that the craft dip liquid of the present invention can generally suppress stickiness of the cured film when it contains 3% by weight or more of polythiol, and can reliably prevent stickiness of the cured film when it contains 4% by weight or more of polythiol.

Claims

1. A craft dipping liquid that forms a hardenable film on the inside of an annular frame by immersing and then removing the frame, This is an ultraviolet-curable resin composition that can be cured in a film state on the inside of the frame by irradiating it with ultraviolet light after the immersed frame has been removed. Contains a surface tension modifier, The aforementioned surface tension adjusting agent is a dipping solution for crafts, characterized in that it contains polyether-modified silicone oil.

2. The craft dipping liquid according to claim 1, characterized in that the polyether-modified silicone oil content is 0.05% by weight or more and less than 1% by weight.

3. A film-forming step involves immersing an annular frame in a craft dipping solution and then lifting it out to form a film on the inside of the frame, A curing step for curing the aforementioned film A method for manufacturing crafts including, The aforementioned dipping solution for crafts is the dipping solution for crafts described in claim 1 or claim 2, A method for manufacturing a craft product, characterized in that, in the hardening step, ultraviolet light is irradiated onto the film formed on the inside of the frame to harden the film.

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