Photocuring water transfer printing ink as well as preparation method and use method thereof

Abstract

The invention discloses a photocuring water transfer printing ink, a preparation method and a use method, and relates to the technical field of inks, the ink is composed of the following components by weight: 25-35 parts of propylene isophthalate resin; 20 to 35 parts of alkoxy modified polyester acrylate; 10 to 20 parts of propylene oxide neopentyl glycol diacrylate; 10 to 20 parts of a monomer; 6 to 10 parts of a photoinitiator; 20 parts of pigment; and 5-10 parts of a filler. The photocuring water transfer printing ink can adapt to curing in modes of LEDs, traditional UV mercury lamps and the like, is good in hydrophobicity, and has good wear resistance, heat resistance, folding resistance and adhesive force.

Description

Technical Field

[0001] The present invention relates to the technical field of inks, and more particularly to a photocurable water transfer ink, a preparation method and a use method thereof. Background Art

[0002] As the efficiency and energy consumption requirements for ink printing in various industries are getting higher and higher, printing operators and users are also demanding higher and higher performance of ink products, so ink manufacturers must continuously improve the quality of inks. They require good transfer performance, high tinting strength, fast drying speed after printing, good friction resistance and smoothness of ink products. To meet these requirements, it is necessary to improve the process of ink raw materials and strictly control the quality of inks.

[0003] Those skilled in the art know that different printing methods require different inks. In the printing process, water transfer printing requires water transfer ink, offset printing requires offset printing ink, plastic printing requires plastic printing ink, etc. This is because their printing plates and printing materials are different, and the substrates to which the inks adhere are different, so different types of inks with different suitability are required.

[0004] At present, the market demand for ink is large, and the water transfer process requires a relatively high hydrophobicity of the ink. The existing ink formulas generally have problems such as weak adhesion and wear resistance, poor gloss, etc. that affect the printing effect; at the same time, the hydrophobicity of the ink does not meet the requirements of high-precision transfer. Therefore, it is necessary to develop a water transfer ink with good hydrophobicity, good wear resistance, strong adhesion and good gloss. Summary of the invention

[0005] In view of the above technical problems, the present invention provides a photocurable water transfer ink having the characteristics of good hydrophobicity, good wear resistance, strong adhesion, good glossiness, light resistance and heat resistance.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] A photocurable water transfer ink comprises the following components in parts by weight:

[0008] 25-35 parts of isophthalic acid propylene ester resin, 20-35 parts of alkoxy modified polyester acrylate, 20-40 parts of monomer, 6-10 parts of photoinitiator, 20 parts of pigment, and 5-10 parts of filler.

[0009] Furthermore, the monomers include cyclotrimethylolpropane formal acrylate and propoxylated neopentyl glycol diacrylate.

[0010] Furthermore, the photoinitiator includes ethyl 2,4,6-trimethylbenzoylphosphinate, 2,4-diethylthioxanthone, tetraethyl Michler's ketone and isooctyl p-N,N-dimethylaminobenzoate.

[0011] Furthermore, the pigment includes at least one of Pigment Blue 1, Pigment Violet 23, Pigment Black 7, Pigment Yellow 13, Pigment Yellow 180, Pigment Yellow 16, Pigment Red 57:1, Pigment Red 185, titanium dioxide, Pigment Blue 1, and Pigment Blue 61.

[0012] Furthermore, the filler includes at least one of calcium carbonate, magnesium carbonate and kaolin.

[0013] A method for preparing a photocurable water transfer ink comprises the following steps: uniformly mixing 25-35 parts of propylene isophthalate resin, 20-35 parts of alkoxy modified polyester acrylate, 20-40 parts of monomer, 6-10 parts of photoinitiator, 20 parts of pigment and 5-10 parts of filler, and grinding the mixture to a fineness of ≤5 μm.

[0014] Furthermore, the grinding further includes vacuum degassing; the stirring method is to add each component of the ingredients into a high-speed disperser, and maintain the rotation speed at 500-1500 rpm for 30 minutes to 2 hours.

[0015] A method for using a light-curable water transfer ink, comprising:

[0016] Applying the above-mentioned light-curable water transfer ink to water transfer paper and curing the ink to form a transfer layer on the water transfer paper;

[0017] Soak the water transfer paper carrying the transfer layer in water so that the transfer layer in the water transfer paper floats in the water;

[0018] The substrate is placed in water so that the transfer layer is transferred to the substrate, and the transfer layer on the substrate is dried.

[0019] Furthermore, the step of immersing the water transfer paper carrying the transfer layer in water so that the transfer layer in the water transfer paper floats in the water further includes: adding a transfer aid into the water, wherein the transfer aid includes a polar ring so that the polar ring is adsorbed in the transfer layer;

[0020] The substrate was plasma sprayed before being placed in water for transfer.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present application adopts alkoxy-modified polyester acrylate as one of the resins. The polyester acrylate modified by alkoxy makes the water transfer ink have a higher gloss. At the same time, the alkoxy-modified polyester acrylate is used in conjunction with isophthalic acid propylene resin and monomer to ensure that the ink contains more hydrophobic groups, thereby improving the hydrophobicity of the water transfer ink. Good gloss and hydrophobicity ensure that the water transfer ink is easy to store and not prone to color bleeding, and the ink pattern transferred to the substrate has good gloss.

[0023] The preparation method of the present application is simple and fast, and the pigment can be added according to the color required by the ink pattern, which is convenient for mass production. By improving the ink formula, it can be ensured that the mass-produced ink has good performance stability.

[0024] The method of using the application increases the polarity of the transfer layer by adding a polar ring to the transfer layer, which helps the transfer layer to be laid flat in the water; polarity treatment of the surface of the substrate helps to improve the adhesion between the transfer layer and the substrate, allowing the two to quickly combine and adhere. The method of use is simple and efficient, and helps to improve the transfer effect and transfer stability. DETAILED DESCRIPTION

[0025] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention. Modifications or substitutions made to the methods, steps or conditions of the present invention without departing from the spirit and essence of the present invention are within the scope of protection of the present invention. Unless otherwise specified, the experimental materials, reagents, instruments, etc. used in the examples of the present invention are all commercially available; unless otherwise specified, all technical means in the examples of the present invention are conventional means well known to those skilled in the art.

[0026] The present application provides a photocurable water transfer ink, comprising the following components in parts by weight: 25-35 parts of isophthalic acid propylene ester resin, 20-35 parts of alkoxy modified polyester acrylate, 20-40 parts of monomer, 6-10 parts of photoinitiator, 20 parts of pigment, and 5-10 parts of filler. Among them, the monomer includes cyclotrimethylolpropane methyl acrylate and propoxylated neopentyl glycol diacrylate. The photoinitiator includes 2,4,6-trimethylbenzoylphosphoethyl ester, 2,4-diethylthioxanthone, tetraethyl Michler's ketone and isooctyl p-N,N-dimethylaminobenzoate. The filler is at least one of calcium carbonate, magnesium carbonate, and kaolin. The pigment includes at least one of pigment blue 1, pigment violet 23, pigment black 7, pigment yellow 13, pigment yellow 180, pigment yellow 16, pigment red 57:1, pigment red 185, titanium dioxide, pigment blue 1, and pigment blue 61.

[0027] Furthermore, the invention comprises the following components in parts by weight: 25-35 parts of propylene isophthalate resin, 20-35 parts of alkoxy modified polyester acrylate, 10-20 parts of cyclotrimethylolpropane formal acrylate, 10-20 parts of propoxylated neopentyl glycol diacrylate; 2-3 parts of ethyl 2,4,6-trimethylbenzoylphosphinate; 2-3 parts of 2,4-diethylthioxanthone; 1-2 parts of tetraethyl Michler's ketone; 1-2 parts of isooctyl p-N,N-dimethylaminobenzoate; 20 parts of pigment; and 5-10 parts of filler.

[0028] The present application adopts alkoxy-modified polyester acrylate as one of the resins. The polyester acrylate modified by alkoxy makes the water transfer ink have a higher gloss. At the same time, the alkoxy-modified polyester acrylate is used in conjunction with isophthalic acid propylene resin and monomer to ensure that the ink contains more hydrophobic groups, thereby improving the hydrophobicity of the water transfer ink. Good gloss and hydrophobicity ensure that the water transfer ink is easy to store and not prone to color bleeding, and the ink pattern transferred to the substrate has good gloss.

[0029] When the alkoxy-modified polyester acrylate is propoxylated neopentyl glycol diacrylate (NPG(PO)2DA), it can be prepared in the following manner:

[0030] S1: Preparation of mixed liquid: Propylene oxide, neopentyl glycol, acrylic acid, catalyst, inhibitor and solvent are placed in a reaction kettle to form a mixed liquid, and the valve is opened to slowly heat the mixture to control the temperature at 60-90°C and maintain the temperature at 60-90°C for 20-40 minutes to react.

[0031] S2: Further heating the reaction: Continue heating to 80-120°C, react for 3-4 hours, then reflux for 5-7 hours, and the reaction is completed.

[0032] S3: washing and stratification: adding aqueous soda ash solution and aqueous sodium chloride solution to the mixed solution, washing, standing and stratifying, and taking the upper organic phase.

[0033] S4: Desolventization: remove the solvent from the upper organic phase.

[0034] S5: Cooling and pressing the material: Cooling and pressing the material to obtain a finished product of propoxylated neopentyl glycol diacrylate (NPG(PO)2DA).

[0035] In the present application, cyclotrimethylolpropane methylal acrylate is used as a monomer, and cyclotrimethylolpropane methylal acrylate is used together with isophthalic acid propylene ester resin and alkoxy modified polyester acrylate, which helps to break the resin chain under heating or high temperature conditions, thereby adjusting the viscosity of the ink, and thereby improving the subsequent cross-linking degree of the ink; at the same time, in the present application, propoxylated neopentyl glycol diacrylate is used as another monomer, which can also adjust the viscosity of the water transfer ink, help the resin chain breakage and fragmentation, and thereby improve the subsequent cross-linking degree of the ink; the two monomers are used together with the two resins, and the synergistic combination promotes the chain breakage at heating to adjust the viscosity, improves the bonding degree of the subsequent process, and makes the water transfer ink have better light curing properties and helps to reduce the curing power.

[0036] At the same time, the synergistic effect of the two monomers and two resins in the present application can also ensure that the ink curing process is tight and the density is increased. At the same time, the added filler can also increase the density of the water transfer ink, so that the water transfer ink has good wear resistance.

[0037] In the present application, the photoinitiator is used together with the monomer and the resin. During the photocuring process of the ink, a large number of hydrophobic groups are generated, so that the water transfer ink in the present application has good hydrophobicity. During the water transfer process, it maintains a good hydrophobic relationship with the aqueous solution, which helps it to be smoothly transferred to the substrate.

[0038] The present application provides a method for preparing a light-curable water transfer ink, comprising the following steps: 25-35 parts of propylene isophthalate resin; 20-35 parts of alkoxy modified polyester acrylate; 10-20 parts of cyclotrimethylolpropane formal acrylate; 10-20 parts of propoxylated neopentyl glycol diacrylate; 2-3 parts of ethyl 2,4,6-trimethylbenzoylphosphinate; 2-3 parts of 2,4-diethylthioxanthone; 1-2 parts of tetraethyl Michler's ketone; -1-2 parts of isooctyl N, N-dimethylaminobenzoate; 20 parts of pigment; 5-10 parts of filler are added into a high-speed disperser at a speed of 500-1500 rpm and a stirring time of 30 minutes to 2 hours. After stirring evenly, the mixture is transferred into a bead mill-three-roller online production line at a bead mill temperature of 65°C-75°C, a cylinder pressure of 35-40KPa, a three-roll mill temperature of 35°C-55°C, a discharge pressure of 35-45KPa, and vacuum degassing to obtain a light-curing water transfer ink.

[0039] The preparation method of the present application is simple and fast, and the pigment can be added according to the color required by the ink pattern, which is convenient for mass production. By improving the ink formula, it can be ensured that the mass-produced ink has good performance stability.

[0040] The present application also provides a method for using a light-curable water transfer ink, comprising:

[0041] S1: Apply light-curable water transfer ink on water transfer paper and cure it. Specifically, apply light-curable water transfer ink on water transfer paper to form a transfer layer on the water transfer paper, and irradiate the transfer layer with LED or traditional UV mercury lamp for a short time to cure the layer; a layer of glue that melts when in contact with water is provided on one side of the water transfer paper for carrying the cured layer, so that the cured layer can be easily separated in water.

[0042] S2: using a transfer aid to treat the transfer layer, and immersing the water transfer paper carrying the transfer layer in water, so that the transfer layer in the water transfer paper floats in the water.

[0043] A small amount of transfer aid is added into the water, wherein the transfer aid includes a polar ring, so that the polar ring is adsorbed in the transfer layer, the polar ring enhances the polarity of the transfer layer, and helps the transfer layer to be spread in the water.

[0044] S3: placing the substrate in water so that the transfer layer is transferred to the substrate, and drying the transfer layer attached to the substrate. Specifically, the substrate is subjected to plasma spraying before being placed in the transfer solution to increase the polarity of the substrate surface, thereby increasing the adhesion of the transfer layer to the substrate.

[0045] It should be noted that only a small amount of transfer aid is required in this application. Since water is a polar molecule and can dissolve polar or ionic substances, if the amount of transfer aid added is too large, it will accelerate the solubility of the transfer layer in water, causing the transfer layer to decompose. A small amount of added polar rings can be attached to both sides of the floating transfer layer, which helps to attach to the surface of the polar treated substrate.

[0046] The method of using the application increases the polarity of the transfer layer by adding a polar ring to the transfer layer, which helps the transfer layer to be laid flat in the water; polarity treatment of the surface of the substrate helps to improve the adhesion between the transfer layer and the substrate, allowing the two to quickly combine and adhere. The method of use is simple and efficient, and helps to improve the transfer effect and transfer stability.

[0047] Example 1

[0048] The present embodiment provides a light-curable water transfer ink, including: 25kg of propylene isophthalate resin, 25kg of alkoxy-modified polyester acrylate, 15kg of propoxylated neopentyl glycol diacrylate, 12kg of cyclotrimethylolpropane formal acrylate, 3kg of 2,4,6-trimethylbenzoylphosphinate TPO-L, 2kg of 2,4-diethylthioxanthone DETX, 1kg of tetraethyl Michler's ketone EMK, 1kg of isooctyl p-N,N-dimethylaminobenzoate EHA, 20kg of pigments (CI pigment blue 1, CI pigment violet 23, CI pigment black 7, CI pigment yellow 13, CI pigment yellow 180, CI pigment yellow 16, CI pigment red 57:1, CI pigment red 185, titanium dioxide, CI pigment blue 1, CI pigment blue 61), and 8kg of fillers (calcium carbonate, magnesium carbonate, kaolin, etc.).

[0049] The present embodiment provides a method for preparing a photocurable water transfer ink, comprising: adding each component in the formula to a high-speed disperser at a speed of 1000 rpm, stirring for 1 hour, and after stirring evenly, transferring to a bead mill-three-roller online production line, the bead mill is at 70° C., the cylinder pressure is 38 KPa, the three-roller is at 34° C., the discharge pressure is 40 KPa, and vacuum degassing is performed to obtain a slurry fluid of basic colors (red, yellow, blue, black, and white) and special colors, namely, the photocurable water transfer ink.

[0050] The present embodiment provides a method for using a light-curable water transfer ink, comprising:

[0051] S1: Apply light-curable water transfer ink on water transfer paper and cure it. Specifically, apply light-curable water transfer ink on water transfer paper to form a transfer layer on the water transfer paper, and irradiate the transfer layer with LED or traditional UV mercury lamp for a short time to cure the layer; a layer of glue that melts when in contact with water is provided on one side of the water transfer paper for carrying the cured layer, so that the cured layer can be easily separated in water.

[0052] S2: using a transfer aid to treat the transfer layer, and immersing the water transfer paper carrying the transfer layer in water, so that the transfer layer in the water transfer paper floats in the water.

[0053] A small amount of transfer aid is added into the water, wherein the transfer aid includes a polar ring, so that the polar ring is adsorbed in the transfer layer, the polar ring enhances the polarity of the transfer layer, and helps the transfer layer to be spread in the water.

[0054] S3: placing the helmet in water so that the transfer layer is transferred to the helmet, and drying the transfer layer attached to the helmet. Specifically, the helmet is subjected to plasma spraying before being placed in the transfer solution to increase the polarity of the helmet surface, thereby increasing the adhesion of the transfer layer to the helmet.

[0055] Example 2

[0056] The present embodiment provides a light-curable water transfer ink, including: 28kg of propylene isophthalate resin, 20kg of alkoxy-modified polyester acrylate, 17kg of propoxylated neopentyl glycol diacrylate, 15kg of cyclotrimethylolpropane formal acrylate, 3kg of 2,4,6-trimethylbenzoylphosphinate ethyl ester TPO-L, 3kg of 2,4-diethylthioxanthone DETX, 1kg of tetraethyl Michler's ketone EMK, 1kg of isooctyl p-N,N-dimethylaminobenzoate EHA, 18kg of pigments (CI pigment blue 1, CI pigment violet 23, CI pigment black 7, CI pigment yellow 13, CI pigment yellow 180, CI pigment yellow 16, CI pigment red 57:1, CI pigment red 185, titanium dioxide, CI pigment blue 1, CI pigment blue 61), and 6kg of fillers (calcium carbonate, magnesium carbonate, kaolin, etc.).

[0057] The present embodiment provides a method for preparing a photocurable water transfer ink, comprising: adding each component in the formula to a high-speed disperser at a speed of 500 rpm, stirring for 2 hours, and after stirring evenly, transferring to a bead mill-three-roller online production line, the bead mill is at 75° C., the cylinder pressure is 38 KPa, the three-roller is at 55° C., the discharge pressure is 45 KPa, and vacuum degassing is performed to obtain a slurry fluid of basic colors (red, yellow, blue, black, and white) and special colors, namely, the photocurable water transfer ink.

[0058] The present embodiment provides a method for using a light-curable water transfer ink, comprising:

[0059] S1: Apply light-curable water transfer ink on water transfer paper and cure it. Specifically, apply light-curable water transfer ink on water transfer paper to form a transfer layer on the water transfer paper, and irradiate the transfer layer with LED or traditional UV mercury lamp for a short time to cure the layer; a layer of glue that melts when in contact with water is provided on one side of the layer for carrying the cured layer, so that the cured layer can be easily separated in water.

[0060] S2: using a transfer aid to treat the transfer layer, and immersing the water transfer paper carrying the transfer layer in water, so that the transfer layer in the water transfer paper floats in the water.

[0061] A small amount of transfer aid is added into the water, wherein the transfer aid includes a polar ring, so that the polar ring is adsorbed in the transfer layer, the polar ring enhances the polarity of the transfer layer, and helps the transfer layer to be spread in the water.

[0062] S3: placing the rearview mirror in water so that the transfer layer is transferred to the rearview mirror, and drying the transfer layer attached to the rearview mirror. Specifically, the rearview mirror is subjected to plasma spraying before being placed in the transfer solution to increase the polarity of the rearview mirror surface, thereby increasing the adhesion of the transfer layer on the rearview mirror.

[0063] Example 3

[0064] The present embodiment provides a light-curable water transfer ink, including: 30kg of propylene isophthalate resin, 25kg of alkoxy-modified polyester acrylate, 10kg of propoxylated neopentyl glycol diacrylate, 10kg of cyclotrimethylolpropane formal acrylate, 3kg of 2,4,6-trimethylbenzoylphosphinate ethyl ester TPO-L, 3kg of 2,4-diethylthioxanthone DETX, 2kg of tetraethyl Michler's ketone EMK, 1kg of isooctyl p-N,N-dimethylaminobenzoate EHA, 18kg of pigments (CI pigment blue 1, CI pigment violet 23, CI pigment black 7, CI pigment yellow 13, CI pigment yellow 180, CI pigment yellow 16, CI pigment red 57:1, CI pigment red 185, titanium dioxide, CI pigment blue 1, CI pigment blue 61), and 5kg of fillers (calcium carbonate, magnesium carbonate, kaolin, etc.).

[0065] The present embodiment provides a method for preparing a photocurable water transfer ink, comprising: adding each component in the formula to a high-speed disperser at a speed of 1500 rpm, stirring for 0.5 hours, and after stirring evenly, transferring to a bead mill-three-roller online production line, the bead mill is at 65° C., the cylinder pressure is 35 KPa, the three-roller is at 35° C., the discharge pressure is 35 KPa, and vacuum degassing is performed to obtain a slurry fluid of basic colors (red, yellow, blue, black, and white) and special colors, namely, the photocurable water transfer ink.

[0066] The present embodiment provides a method for using a light-curable water transfer ink, comprising:

[0067] S1: Apply light-curable water transfer ink on water transfer paper and cure it. Specifically, apply light-curable water transfer ink on water transfer paper to form a transfer layer on the water transfer paper, and irradiate the transfer layer with LED or traditional UV mercury lamp for a short time to cure the layer; a layer of glue that melts when in contact with water is provided on one side of the water transfer paper for carrying the cured layer, so that the cured layer can be easily separated in water.

[0068] S2: using a transfer aid to treat the transfer layer, and immersing the water transfer paper carrying the transfer layer in water, so that the transfer layer in the water transfer paper floats in the water.

[0069] A small amount of transfer aid is added into the water, wherein the transfer aid includes a polar ring, so that the polar ring is adsorbed in the transfer layer, the polar ring enhances the polarity of the transfer layer, and helps the transfer layer to be spread in the water.

[0070] S3: placing the substrate in water so that the transfer layer is transferred to the substrate, and drying the transfer layer attached to the substrate. Specifically, the substrate is subjected to plasma spraying before being placed in the transfer solution to increase the polarity of the substrate surface, thereby increasing the adhesion of the transfer layer to the substrate.

[0071] Example 4

[0072] The present embodiment provides a light-curable water transfer ink, including: 25kg of propylene isophthalate resin, 35kg of alkoxy-modified polyester acrylate, 10kg of propoxylated neopentyl glycol diacrylate, 20kg of cyclotrimethylolpropane formal acrylate, 3kg of 2,4,6-trimethylbenzoylphosphinate ethyl ester TPO-L, 3kg of 2,4-diethylthioxanthone DETX, 2kg of tetraethyl Michler's ketone EMK, 1kg of isooctyl p-N,N-dimethylaminobenzoate EHA, 20kg of pigments (CI pigment blue 1, CI pigment violet 23, CI pigment black 7, CI pigment yellow 13, CI pigment yellow 180, CI pigment yellow 16, CI pigment red 57:1, CI pigment red 185, titanium dioxide, CI pigment blue 1, CI pigment blue 61), and 10kg of fillers (calcium carbonate, magnesium carbonate, kaolin, etc.).

[0073] The present embodiment provides a method for preparing a photocurable water transfer ink, comprising: adding each component in the formula to a high-speed disperser at a speed of 1200 rpm, stirring for 1.5 hours, and after stirring evenly, transferring to a bead mill-three-roller online production line, the bead mill is at 72° C., the cylinder pressure is 37 KPa, the three-roller is at 45° C., the discharge pressure is 42 KPa, and vacuum degassing is performed to obtain a slurry fluid of basic colors (red, yellow, blue, black, and white) and special colors, namely, the photocurable water transfer ink.

[0074] The present embodiment provides a method for using a light-curable water transfer ink, comprising:

[0075] S1: Apply light-curable water transfer ink on water transfer paper and cure it. Specifically, apply light-curable water transfer ink on water transfer paper to form a transfer layer on the water transfer paper, and irradiate the transfer layer with LED or traditional UV mercury lamp for a short time to cure the layer; a layer of glue that melts when in contact with water is provided on one side of the water transfer paper for carrying the cured layer, so that the cured layer can be easily separated in water.

[0076] S2: using a transfer aid to treat the transfer layer, and immersing the water transfer paper carrying the transfer layer in water, so that the transfer layer in the water transfer paper floats in the water.

[0077] A small amount of transfer aid is added into the water, wherein the transfer aid includes a polar ring, so that the polar ring is adsorbed in the transfer layer, the polar ring enhances the polarity of the transfer layer, and helps the transfer layer to be spread in the water.

[0078] S3: placing the substrate in water so that the transfer layer is transferred to the substrate, and drying the transfer layer attached to the substrate. Specifically, the substrate is subjected to plasma spraying before being placed in the transfer solution to increase the polarity of the substrate surface, thereby increasing the adhesion of the transfer layer to the substrate.

[0079] Example 5

[0080] The present embodiment provides a light-curable water transfer ink, including: 35kg of propylene isophthalate resin, 20kg of alkoxy-modified polyester acrylate, 20kg of propoxylated neopentyl glycol diacrylate, 20kg of cyclotrimethylolpropane formal acrylate, 3kg of 2,4,6-trimethylbenzoylphosphinate ethyl ester TPO-L, 3kg of 2,4-diethylthioxanthone DETX, 2kg of tetraethyl Michler's ketone EMK, 2kg of isooctyl p-N,N-dimethylaminobenzoate EHA, 20kg of pigments (CI pigment blue 1, CI pigment violet 23, CI pigment black 7, CI pigment yellow 13, CI pigment yellow 180, CI pigment yellow 16, CI pigment red 57:1, CI pigment red 185, titanium dioxide, CI pigment blue 1, CI pigment blue 61), and 10kg of fillers (calcium carbonate, magnesium carbonate, kaolin, etc.).

[0081] The present embodiment provides a method for preparing a photocurable water transfer ink, comprising: adding each component in the formula to a high-speed disperser at a speed of 1200 rpm, stirring for 2 hours, and after stirring evenly, transferring to a bead mill-three-roller online production line, the bead mill is 72° C., the cylinder pressure is 37 KPa, the three-roller is 45° C., the discharge pressure is 42 KPa, and vacuum degassing is performed to obtain a slurry fluid of basic colors (red, yellow, blue, black, and white) and special colors, namely, the photocurable water transfer ink.

[0082] The present embodiment provides a method for using a light-curable water transfer ink, comprising:

[0083] S1: Apply light-curable water transfer ink on water transfer paper and cure it. Specifically, apply light-curable water transfer ink on water transfer paper to form a transfer layer on the water transfer paper, and irradiate the transfer layer with LED or traditional UV mercury lamp for a short time to cure the layer; a layer of glue that melts when in contact with water is provided on one side of the water transfer paper for carrying the cured layer, so that the cured layer can be easily separated in water.

[0084] S2: using a transfer aid to treat the transfer layer, and immersing the water transfer paper carrying the transfer layer in water, so that the transfer layer in the water transfer paper floats in the water.

[0085] A small amount of transfer aid is added into the water, wherein the transfer aid includes a polar ring, so that the polar ring is adsorbed in the transfer layer, the polar ring enhances the polarity of the transfer layer, and helps the transfer layer to be spread in the water.

[0086] S3: placing the substrate in water so that the transfer layer is transferred to the substrate, and drying the transfer layer attached to the substrate. Specifically, the substrate is subjected to plasma spraying before being placed in the transfer solution to increase the polarity of the substrate surface, thereby increasing the adhesion of the transfer layer to the substrate.

[0087] The properties of the light-curable water transfer inks of Examples 1-5 were tested, and the test results are shown in Table 1. As can be seen from Table 1, the inks of the present application have small color difference, good tinting strength, adhesion, folding resistance, friction resistance, smoothness, light resistance and heat resistance, high drying efficiency, low energy consumption, good transfer effect, meet various indicators of water transfer inks, and have high ink quality.

[0088] Table 1

[0089]

[0090] Regarding the glossiness, abrasion resistance and water resistance tests of the ink, the present application also provides the following comparative examples.

[0091] Comparative Example 1

[0092] The difference between this comparative example and Example 1 is that the weight of the isophthalic acid propylene ester resin is 50 kg, and no alkoxy-modified polyester acrylate is added. The other aspects are the same as those of Example 1.

[0093] Comparative Example 2

[0094] The difference between this comparative example and Example 1 is that the weight of cyclotrimethylolpropane formal acrylate is 27 kg, propoxylated neopentyl glycol diacrylate is not added, and the other aspects are the same as Example 1.

[0095] Comparative Example 3

[0096] The difference between this comparative example and Example 1 is that the weight of propoxylated neopentyl glycol diacrylate is 15 kg, cyclotrimethylolpropane formal acrylate is not added, and the other parts are the same as Example 1.

[0097] Comparative Example 4

[0098] The light-curing water transfer ink sold on the market was tested.

[0099] Detection Methods

[0100] The light-curable water transfer ink prepared in each embodiment and comparative example was transferred to a helmet or a car rearview mirror, the coating thickness was kept consistent, and the ink related properties were tested.

[0101] The test method is as follows:

[0102] Gloss: gloss value at 60° measured in accordance with GB / T 9754-2007;

[0103] Abrasion resistance: Taber CS17 method was used to test the abrasion resistance of the paint film. The load was 1000g, and the film was rotated 1500 times to measure the weight loss of the film (in mg).

[0104] Water resistance: Water resistance test is carried out in accordance with GB / T1733-1993.

[0105] The test results are shown in Table 2

[0106] Table 2

[0107] project Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Glossiness 98.5 52 97.3 98.2 81 Wear value / mg 36 41 90 86 52 Water resistance / h 85 82 71 68 75

[0108] From the comparison between Example 1 and Comparative Examples 1-4, it can be seen that the combination of propylene isophthalate resin, alkoxy modified polyester acrylate, propoxylated neopentyl glycol diacrylate, and cyclotrimethylolpropane formal acrylate can improve the gloss and water resistance of the ink and reduce abrasion.

[0109] Alkoxy-modified polyester acrylate can improve the glossiness of ink. Comparative Example 2 lacks alkoxy-modified polyester acrylate, and the glossiness of ink is also reduced.

[0110] It can be seen from Comparative Examples 2 and 3 that propoxylated neopentyl glycol diacrylate and cyclotrimethylolpropane formal acrylate are used as monomers in the production of ink. Adding them together with the resin can adjust the viscosity of the ink, improve the bonding degree of subsequent processes, make the ink more closely bonded to the helmet or rearview mirror, and improve the wear resistance of the ink.

[0111] The beneficial effects of the present invention are:

[0112] (1) The photocurable water transfer ink of the present application has small color difference, good tinting power, adhesion, folding resistance, friction resistance, smoothness, light resistance and heat resistance, high drying efficiency, low energy consumption and good transfer effect. The present application adopts alkoxy-modified polyester acrylate as one of the resins. The polyester acrylate modified by alkoxy makes the water transfer ink have a higher gloss. At the same time, the alkoxy-modified polyester acrylate is used in conjunction with isophthalic acid propylene resin and monomer to ensure that the ink contains more hydrophobic groups and improve the hydrophobicity of the water transfer ink. The good gloss and hydrophobicity ensure that the water transfer ink is easy to store and not easy to bleed colors, and the ink pattern transferred to the substrate has good gloss.

[0113] (2) The preparation method of the photocurable water transfer ink of the present application is simple and efficient. The monomer and resin can cooperate with each other to promote the resin chain breaking by heating up to adjust the viscosity of the ink, improve the subsequent cross-linking degree, and improve the wear resistance and adhesion of the ink film layer; the pigment can be added according to the color required by the ink pattern, which is convenient for mass production, and by improving the ink formula, it can ensure that the mass-produced ink has good performance stability.

[0114] (3) The method of using the photocurable water transfer ink of the present application is simple and efficient, and has good transfer effect and transfer stability. By adding a polar ring to the transfer layer, the polarity of the transfer layer is enhanced, which helps the transfer layer to be spread flat in water. Polar treatment of the surface of the substrate helps to improve the adhesion between the transfer layer and the substrate, allowing the two to quickly combine and adhere.

[0115] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. A light-curable water transfer ink, It is characterized in that The composition comprises the following components in parts by weight: 25-35 parts of isophthalic acid propylene ester resin, 20-35 parts of alkoxy modified polyester acrylate, 20-40 parts of monomer, 6-10 parts of photoinitiator, 20 parts of pigment, and 5-10 parts of filler.

2. The light-curable water transfer ink according to claim 1, It is characterized in that The monomers include cyclotrimethylolpropane formal acrylate and propoxylated neopentyl glycol diacrylate.

3. The light-curable water transfer ink according to claim 1, It is characterized in that The photoinitiator includes ethyl 2,4,6-trimethylbenzoylphosphinate, 2,4-diethylthioxanthone, tetraethyl Michler's ketone and isooctyl p-N,N-dimethylaminobenzoate.

4. The light-curable water transfer ink according to claim 1, It is characterized in that The pigment includes at least one of Pigment Blue 1, Pigment Violet 23, Pigment Black 7, Pigment Yellow 13, Pigment Yellow 180, Pigment Yellow 16, Pigment Red 57:1, Pigment Red 185, titanium dioxide, Pigment Blue 1, and Pigment Blue 61.

5. The light-curable water transfer ink according to claim 1, It is characterized in that The filler includes at least one of calcium carbonate, magnesium carbonate and kaolin.

6. A method for preparing a light-curable water transfer ink, It is characterized in that The method comprises the following steps: uniformly mixing 25-35 parts of isophthalic acid propylene ester resin, 20-35 parts of alkoxy modified polyester acrylate, 20-40 parts of monomer, 6-10 parts of photoinitiator, 20 parts of pigment and 5-10 parts of filler, and grinding the mixture to a fineness of ≤5 μm.

7. The preparation method according to claim 6, It is characterized in that The grinding process also includes vacuum degassing.

8. The preparation method according to claim 6, It is characterized in that The stirring method is to add each component of the ingredients into a high-speed disperser, and maintain the rotation speed at 500-1500 rpm for 30 minutes to 2 hours.

9. A method for using a light-curable water transfer ink, It is characterized in that include: The photocurable water transfer ink of claim 1 is applied to water transfer paper and cured to form a transfer layer on the water transfer paper; Soak the water transfer paper carrying the transfer layer in water so that the transfer layer in the water transfer paper floats in the water; The substrate is placed in water so that the transfer layer is transferred to the substrate, and the transfer layer on the substrate is dried.

10. The method of use according to claim 9, It is characterized in that The method of soaking the water transfer paper carrying the transfer layer in water so that the transfer layer in the water transfer paper floats in the water also includes: adding a transfer aid into the water, wherein the transfer aid includes a polar ring so that the polar ring is adsorbed in the transfer layer; The substrate was plasma sprayed before being placed in water for transfer.

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