Laser transfer coating and preparation method thereof

Abstract

In order to overcome the problem that the main resin has a high softening point and needs high temperature molding during the preparation of laser coatings in the prior art, and has high requirements for process and equipment, the present invention provides a laser transfer coating and a preparation method thereof, including a main resin, the main resin including an acrylate monomer and a first functional monomer, the first functional monomer including one or more of o-phenylphenoxyethyl acrylate, 2-phenoxyethyl methacrylate, ethoxylated bisphenol A diacrylate, propoxylated bisphenol A diacrylate and 4-biphenylmethanol acrylate; the main resin also includes a second functional monomer, and the second functional monomer includes an unsaturated monomer containing a heterocyclic side group or a polar group. The laser transfer coating provided by the present invention, after the acrylate monomer is combined with the first functional monomer, not only provides good film-forming properties for the coating, but also has good optical properties, and can also regulate the reflection and refraction of light at a microscopic level, and enhance the visual effect of the laser transfer coating.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a laser transfer coating and a preparation method thereof. Background Art

[0002] In the modern decoration and packaging industry, holographic laser transfer coatings are favored by the market for their unique and beautiful visual effects and anti-counterfeiting functions. Holographic laser transfer coatings are a special type of coating that combines holographic technology and laser effects. By forming complex optical interference patterns on the substrate, it produces dynamic and three-dimensional visual effects and has anti-counterfeiting properties. In addition, holographic laser transfer coatings can form clear and delicate holographic patterns on the substrate through their unique optical properties and processes, presenting rich colors and layers, greatly enhancing the visual effects and attractiveness of the product.

[0003] In addition, due to the complexity and uniqueness of the holographic pattern, it is difficult to be copied and forged, providing an effective anti-counterfeiting method for the product. This makes holographic laser transfer coatings widely used in many fields.

[0004] Among them, high-definition laser effects can better show the visual effects of holographic patterns and enhance the attractiveness of products. The high definition of holographic laser transfer coatings is mainly manifested in three aspects: high transfer brightness L value, high reflectivity, and uniform and defect-free laser effect. The technical key to this type of transfer coating lies in the selection of film-forming materials and the optimization of the formula design of coating components to ensure high-yield production of products under conditions of high cost-effectiveness and relatively low process thresholds.

[0005] However, in the pursuit of a lower threshold process method to manufacture coating products with high-definition holographic laser effects, the existing technology still faces some challenges. The main problem is that the main resin has a high softening point and requires high-temperature molding, which places high demands on the process and equipment. Summary of the invention

[0006] Aiming at the problem that the main resin in the preparation process of laser coating in the prior art has a high softening point and needs high-temperature molding, and has high requirements on process and equipment, a laser transfer coating and a preparation method thereof are provided.

[0007] The technical solution adopted by the present invention to solve the above technical problems is as follows:

[0008] In one aspect, the present invention provides a laser transfer coating, comprising a main resin, wherein the main resin comprises an acrylate monomer and a first functional monomer, wherein the first functional monomer comprises one or more of o-phenylphenoxyethyl acrylate, 2-phenoxyethyl methacrylate, ethoxylated bisphenol A diacrylate, propoxylated bisphenol A diacrylate and 4-biphenylmethanol acrylate;

[0009] The main resin further includes a second functional monomer, wherein the second functional monomer includes an unsaturated monomer containing a heterocyclic side group or a polar group.

[0010] Optionally, the acrylic acid ester monomers include two or more of methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate and isobutyl methacrylate.

[0011] Optionally, the refractive index of the second functional monomer is ≥1.50.

[0012] Optionally, the second functional monomer includes one or more of N-acryloylmorpholine, N-vinylpyrrolidone, and 1-methacryloyloxy-3-adamantanol.

[0013] Optionally, the main resin includes the following mass components:

[0014] Acrylate monomer 20.0~42.5 parts

[0015] 2.5~25 parts of the first functional monomer

[0016] 0.05~2.5 parts of the second functional monomer

[0017] Initiator 0.05~2.5 parts

[0018] 50-55 parts of the first solvent.

[0019] Optionally, the initiator includes one or more of dibenzoyl peroxide, dilauroyl peroxide, tert-butyl peroxy-2-ethylhexanoate, azobisisobutyronitrile, azobisisoheptanenitrile and dimethyl azobisisobutyrate; and / or, the first solvent includes one or more of ethyl acetate, butyl acetate, n-propyl acetate, butanone, methyl isobutyl ketone, propylene glycol monomethyl ether and isopropanol.

[0020] Optionally, the following quality components may be included:

[0021] Main resin 10.5~26.6 parts

[0022] Auxiliary resin 4.4~11.4 parts

[0023] Additive 0.1~2 parts

[0024] 60-85 parts of the second solvent.

[0025] Optionally, the auxiliary resin includes one or more of cellulose acetate butyrate, cellulose acetate propionate, nitrocellulose, and vinyl chloride resin; and / or the auxiliary agent includes one or more of a defoaming agent, a leveling agent, and a wetting agent.

[0026] Optionally, the second solvent includes one or more of ethyl acetate, butyl acetate, n-propyl acetate, butanone, methyl isobutyl ketone, propylene glycol monomethyl ether and isopropyl alcohol.

[0027] In another aspect, the present invention provides a method for preparing the above-mentioned laser transfer coating, comprising the following operations:

[0028] S1: taking an acrylate monomer, a first functional monomer, and a second functional monomer and mixing them evenly to obtain a mixture;

[0029] S2: taking part of the mixture in S1 and mixing it with the first solvent, taking the remaining mixture in S1 and mixing it with the first solvent to obtain a main resin;

[0030] S3: taking the second solvent, the auxiliary resin and the main resin, dissolving and mixing them to obtain the laser transfer coating.

[0031] The beneficial effects of the present invention are:

[0032] The laser transfer coating provided by the present invention comprises a main resin, wherein the main resin comprises an acrylate monomer and a first functional monomer, wherein the acrylate monomer forms a polymer network by polymerization in the laser transfer coating, and provides good film-forming property for the coating, and the acrylate monomer and the first functional monomer are combined to not only provide good film-forming property for the coating but also have good optical property, and can also regulate the reflection and refraction of light at a microscopic level, thereby enhancing the visual effect of the laser transfer coating coating; the second functional monomer, which comprises an unsaturated monomer containing a heterocyclic side group or a polar group, has a corresponding polarity, and when the second functional monomer with polarity is applied to the laser transfer coating, the polar site of the second functional monomer can effectively improve the interaction force between the coating and ink or other printing materials, thereby facilitating the improvement of the adhesion and printability of the laser transfer coating. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] The present invention provides a laser transfer coating, comprising a main resin, wherein the main resin comprises an acrylate monomer and a first functional monomer, wherein the first functional monomer comprises one or more of o-phenylphenoxyethyl acrylate, 2-phenoxyethyl methacrylate, ethoxylated bisphenol A diacrylate, propoxylated bisphenol A diacrylate and 4-biphenylmethanol acrylate;

[0035] The main resin further includes a second functional monomer, wherein the second functional monomer includes an unsaturated monomer containing a heterocyclic side group or a polar group.

[0036] Specifically, it includes a main resin, wherein the main resin includes an acrylate monomer and a first functional monomer. The acrylate monomer forms a polymer network by polymerization in the laser transfer coating, providing the coating with good film-forming properties. The combination of the acrylate monomer and the first functional monomer not only provides the coating with good film-forming properties but also has good optical properties, and can also regulate the reflection and refraction of light at a microscopic level, thereby enhancing the visual effect of the laser transfer coating; the second functional monomer, which includes an unsaturated monomer containing a heterocyclic side group or a polar group, has a corresponding polarity. When the second functional monomer with polarity is applied to the laser transfer coating, the polar site of the second functional monomer can effectively improve the interaction between the coating and the ink or other printing materials, thereby facilitating the improvement of the adhesion and printability of the laser transfer coating.

[0037] The specific functional groups and chemical bonds contained in the molecular structure of the first functional monomer, such as the benzene ring and other groups in o-phenylphenoxyethyl acrylate, can produce a specific refraction effect on visible light. The chemical structure of propoxylated bisphenol A diacrylate contains a bisphenol A skeleton. Bisphenol A not only provides a certain rigidity for the polymer network, but its biphenyl structure can produce a stronger refraction and dispersion effect on visible light. That is, after the first functional monomer is polymerized with the acrylate monomer to form a coating film, its aggregation state has a specific influence on the propagation path and intensity of visible light.

[0038] In a preferred embodiment, the first functional monomer is selected from at least one of o-phenylphenoxyethyl acrylate and 2-phenoxyethyl methacrylate.

[0039] In some embodiments, the acrylic acid ester monomer includes two or more of methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, and isobutyl methacrylate.

[0040] Specifically, acrylate monomers form a tough polymer network in the coating through polymerization reaction, which gives the coating good adhesion and wear resistance. Since the coating needs to be firmly attached to the substrate and remain intact during the transfer process, this film-forming property is particularly important for laser transfer coatings.

[0041] Specifically, in a preferred embodiment, the acrylic acid ester monomer is selected from two or more of ethyl acrylate, methyl methacrylate, butyl acrylate and n-butyl methacrylate.

[0042] In some embodiments, the refractive index of the second functional monomer is ≥1.50.

[0043] It should be noted that the refractive index of the second functional monomer is ≥1.50, and when measured at 20 degrees Celsius using D-line (yellow double-line sodium spectral line, wavelength of 589.3 nanometers) light, the refractive index is ≥1.50.

[0044] The second functional monomer includes an unsaturated monomer containing a heterocyclic side group or a polar group, and the second functional monomer includes one or more of N-acryloylmorpholine, N-vinylpyrrolidone, and 1-methacryloyloxy-3-adamantanol.

[0045] Specifically, the second functional monomer includes an unsaturated monomer containing a heterocyclic side group or a polar group. This type of second functional monomer has corresponding polarity. When the polar second functional monomer is applied to the laser transfer coating, the polar site of the second functional monomer can effectively enhance the interaction between the coating and the ink or other printing materials, thereby facilitating the improvement of the printability of the laser transfer coating.

[0046] In a preferred embodiment, the second functional monomer is selected from one or more of N-acryloylmorpholine, 1-methacryloyloxy-3-adamantanol and N-vinylpyrrolidone.

[0047] In some embodiments, the host resin includes the following mass components:

[0048] Acrylate monomer 20.0~42.5 parts

[0049] 2.5~25 parts of the first functional monomer

[0050] 0.05~2.5 parts of the second functional monomer

[0051] Initiator 0.05~2.5 parts

[0052] 50-55 parts of the first solvent.

[0053] It should be noted that acrylate monomers can be used to synthesize coating resins with good compatibility with ink systems through free radical polymerization reactions. Such resins have high brightness, good transparency and excellent scratch resistance, thereby solving the problems of existing coating systems in terms of flow parallelism, bonding strength with inks, and brightness, transparency and scratch resistance of the printed layout. When the acrylate monomers in the main resin described in the present application are combined with the first functional monomer, the acrylate monomers are modified by using the first functional monomer, which can significantly improve the refractive index of the acrylate monomers. In laser transfer coatings, a higher refractive index helps to enhance the gloss and visual effect of the coating after coating, making the laser pattern more three-dimensional and vivid.

[0054] Specifically, the mass percentage of the acrylic acid ester monomer may be 20.0 parts, 25.0 parts, 30.0 parts, 35.0 parts, 38.0 parts, 40.0 parts or 42.5 parts;

[0055] The mass percentage of the first functional monomer may be 2.5 parts, 5.0 parts, 7.0 parts, 7.9 parts, 10.0 parts, 15.0 parts, 20.0 parts or 25.0 parts;

[0056] The mass percentage of the second functional monomer may be 0.05 parts, 0.10 parts, 0.20 parts, 0.50 parts, 1.0 parts, 1.5 parts, 2.0 parts or 2.5 parts;

[0057] The mass percentage of the initiator may be 0.05 parts, 0.15 parts, 0.20 parts, 0.50 parts, 1.1 parts, 1.5 parts, 2.0 parts or 2.5 parts.

[0058] In some embodiments, the initiator includes one or more of dibenzoyl peroxide, dilauroyl peroxide, tert-butyl peroxy-2-ethylhexanoate, azobisisobutyronitrile, azobisisoheptanenitrile and dimethyl azobisisobutyrate; and / or, the first solvent includes one or more of ethyl acetate, butyl acetate, n-propyl acetate, butanone, methyl isobutyl ketone, propylene glycol monomethyl ether and isopropanol.

[0059] Specifically, in a preferred embodiment, the initiator is selected from one of azobisisoheptanonitrile and azobisisobutyronitrile.

[0060] Specifically, in a preferred embodiment, the first solvent is selected from one or more of ethyl acetate, n-propyl acetate and butanone.

[0061] In some embodiments, the laser transfer coating comprises the following mass components:

[0062] Main resin 10.5~26.6 parts

[0063] Auxiliary resin 4.4~11.4 parts

[0064] Additive 0.1~2 parts

[0065] 60-85 parts of the second solvent.

[0066] In some embodiments, the auxiliary resin includes one or more of cellulose acetate butyrate, cellulose acetate propionate, nitrocellulose, and vinyl chloride resin; and / or, the auxiliary agent includes one or more of a defoamer, a leveling agent, and a wetting agent.

[0067] Specifically, in a preferred embodiment, the auxiliary resin is selected from one of cellulose acetate butyrate and nitrocellulose;

[0068] In some embodiments, the second solvent includes one or more of ethyl acetate, butyl acetate, n-propyl acetate, butanone, methyl isobutyl ketone, propylene glycol monomethyl ether, and isopropyl alcohol.

[0069] Specifically, the second solvent may be the same as the first solvent.

[0070] Another embodiment of the present invention provides a method for preparing a laser transfer coating, comprising the following operations:

[0071] S1: taking an acrylate monomer, a first functional monomer, and a second functional monomer and mixing them evenly to obtain a mixture;

[0072] S2: taking part of the mixture in S1 and mixing it with the first solvent, taking the remaining mixture in S1 and mixing it with the first solvent to obtain a main resin;

[0073] S3: taking a second solvent and an auxiliary resin, dissolving and mixing them with the main resin to obtain a laser transfer coating.

[0074] Specifically, the specific preparation method of the laser transfer coating includes the following operations:

[0075] S1: Mix the acrylic ester monomer, the first functional monomer, the second functional monomer, etc. uniformly, take 1 / 3 of them and mix with the solvent and add them into the reaction kettle, stir slowly and heat to 50-90°C under nitrogen atmosphere;

[0076] S2: The remaining mixed monomers are mixed evenly with the solvent, 2 / 3 of the initiator, etc., placed in a high-level tank, dripped at a uniform speed for 2-5 hours, and kept warm for 1-2 hours;

[0077] S3: Add the remaining initiator, raise the temperature to 55-95°C, and keep the temperature for reaction for 2-4 hours;

[0078] S4: Cooling to 50-60°C, adding solvent to adjust solid content, filtering the material to obtain the main resin;

[0079] S5: Add 30-50 parts of solvent into the reaction kettle, heat it to 50-70°C, add auxiliary resin, and stir for 2-4 hours until it is completely dissolved;

[0080] S6: Add the main resin, additives, and solvent, and stir at 50-60°C for 1-3 hours to obtain a laser transfer coating.

[0081] The present invention is further described below by way of examples.

[0082] Table 1

[0083]

[0084] Example 1

[0085] This embodiment is used to illustrate a laser transfer coating and a preparation method thereof disclosed in the present invention, and includes the following steps:

[0086] Example 1: Laser transfer coating was prepared according to the materials, material addition amounts and corresponding material numbers in Table 1:

[0087] S1: Mix materials 1 to 5 evenly to make a mixed monomer, take 1 / 3 of the mixed monomer and 1 / 2 of material 7 and add them into the reactor, stir slowly and heat to 65°C under nitrogen atmosphere;

[0088] S2: Mix the remaining part of the mixed monomer, 2 / 3 of material 6, the remaining part of material 7, and material 8 evenly, place in a high-level tank, drip at a constant speed for 4 hours, and keep warm for 1 hour;

[0089] S3: Add the remaining part of material 6, raise the temperature to 70°C and keep reacting for 3 hours.

[0090] S4: Cool down to 55°C, adjust the solid content to 50 parts, filter out the material, and obtain the main resin.

[0091] S5: 40 parts of butanone were added into the reaction kettle, and the temperature was raised to 65° C., 11.4 parts of cellulose acetate propionate were added, and the mixture was stirred at 200 rpm for 2 h until it was completely dissolved.

[0092] S6: 26.6 parts of main resin, 0.05 parts of wetting agent, 0.05 parts of leveling agent, 15 parts of ethyl acetate and 5 parts of isopropanol were added to the above reaction kettle in sequence, and stirred at 60° C. for 2 hours to obtain laser transfer coating.

[0093] Table 2

[0094]

[0095] Example 2

[0096] This embodiment is used to illustrate a laser transfer coating and a preparation method thereof disclosed in the present invention, and includes the following steps:

[0097] Example 2: Laser transfer coating was prepared according to the materials, material addition amounts and corresponding material numbers in Table 2:

[0098] S1: Mix materials 1 to 4 evenly to make a mixed monomer, take 1 / 3 of the mixed monomer and 1 / 2 of material 6 and add them into the reactor, stir slowly and heat to 70°C under nitrogen atmosphere;

[0099] S2: Mix the remaining part of the mixed monomer, 2 / 3 of material 5, the remaining part of material 6, and material 7 evenly, place them in a high-level tank, drip them at a constant speed for 4 hours, and keep them warm for 1 hour;

[0100] S3: Add the remaining part of material 5, raise the temperature to 75°C and keep reacting for 2.5 hours.

[0101] S4: Cool down to 55°C, adjust the solid content to 50 parts, filter out the material, and obtain the main resin.

[0102] S5: Add 60 parts of ethyl acetate into a reaction kettle, heat it to 65°C, add 4.4 parts of cellulose acetate butyrate, and stir at 200 rpm for 2 hours until it is completely dissolved.

[0103] S6: 10.5 parts of main resin, 0.1 parts of wetting agent, 20 parts of ethyl acetate and 5 parts of propylene glycol monomethyl ether were added to the above reaction kettle in sequence, and stirred at 60° C. for 2 hours to obtain laser transfer coating.

[0104] Table 3

[0105]

[0106] Example 3

[0107] This embodiment is used to illustrate a laser transfer coating and a preparation method thereof disclosed in the present invention, and includes the following steps:

[0108] Example 3: Laser transfer coating was prepared according to the materials, material addition amounts and corresponding material numbers in Table 3:

[0109] S1: Mix materials 1 to 5 evenly to make a mixed monomer, take 1 / 3 of the mixed monomer and 1 / 2 of material 7 and add them into the reactor, stir slowly and heat to 65°C under nitrogen atmosphere;

[0110] S2: Mix the remaining part of the mixed monomer, 2 / 3 of material 6, the remaining part of material 7, and material 8 evenly, place in a high-level tank, drip at a constant speed for 4 hours, and keep warm for 1 hour;

[0111] S3: Add the remaining part of material 6, raise the temperature to 70°C and keep the reaction for 3 hours.

[0112] S4: Cool down to 55°C, adjust the solid content to 50 parts, filter out the material, and obtain the main resin.

[0113] S5: Add 50 parts of butanone into a reaction kettle, raise the temperature to 65°C, add 8.8 parts of nitrocellulose, and stir at 200 rpm for 2 hours until it is completely dissolved.

[0114] S6: 20.6 parts of main resin, 0.05 parts of wetting agent, 0.05 parts of leveling agent, 14.5 parts of ethyl acetate, and 5 parts of butyl acetate were added to the above reactor in sequence, and stirred at 60° C. for 2 hours to obtain a laser transfer coating.

[0115] Table 4

[0116]

[0117] Comparative Example 1

[0118] This comparative example is used to compare and illustrate a laser transfer coating and a preparation method thereof disclosed in the present invention, and includes the following steps:

[0119] Comparative Example 1: Laser transfer coating was prepared according to the materials, material addition amounts and corresponding material numbers in Table 4:

[0120] S1: Mix materials 1 to 3 evenly to make a mixed monomer, take 1 / 3 of the mixed monomer and 1 / 2 of material 5, add them into the reactor, stir slowly and heat to 70°C under nitrogen atmosphere;

[0121] S2: Mix the remaining part of the mixed monomer, 2 / 3 of material 4, the remaining part of material 5, and material 6 evenly, place them in a high-level tank, drip them at a uniform speed for 4 hours, and keep them warm for 1 hour;

[0122] S3: Add the remaining portion of material 4, raise the temperature to 75°C and keep reacting for 2.5 hours.

[0123] S4: Cool down to 55°C, adjust the solid content to 50 parts, filter out the material, and obtain the main resin.

[0124] S5: Add 60 parts of ethyl acetate into a reaction kettle, heat it to 65°C, add 4.4 parts of cellulose acetate butyrate, and stir at 200 rpm for 2 hours until it is completely dissolved.

[0125] S6: 10.5 parts of main resin, 0.1 parts of wetting agent, 20 parts of ethyl acetate and 5 parts of propylene glycol monomethyl ether were added to the above reaction kettle in sequence, and stirred at 60° C. for 2 hours to obtain laser transfer coating.

[0126] Table 5

[0127]

[0128] Comparative Example 2

[0129] This comparative example is used to compare and illustrate a laser transfer coating and a preparation method thereof disclosed in the present invention, and includes the following steps:

[0130] Comparative Example 2: Laser transfer coating was prepared according to the materials, material addition amounts and corresponding material numbers in Table 5:

[0131] S1: Mix material 1 and material 2 evenly to make a mixed monomer, take 1 / 3 of the mixed monomer and 1 / 2 of material 4 and add them into the reactor, stir slowly and heat to 70°C under nitrogen atmosphere;

[0132] S2: Mix the remaining part of the mixed monomer, 2 / 3 of material 3, the remaining part of material 4, and material 5 evenly, place them in a high-level tank, drip them at a uniform speed for 4 hours, and keep them warm for 1 hour;

[0133] S3: Add the remaining portion of material 3, raise the temperature to 75°C and keep reacting for 2.5 hours.

[0134] S4: Cool down to 55°C, adjust the solid content to 50 parts, filter out the material, and obtain the main resin.

[0135] S5: Add 60 parts of ethyl acetate into a reaction kettle, heat it to 65°C, add 4.4 parts of cellulose acetate butyrate, and stir at 200 rpm for 2 hours until it is completely dissolved.

[0136] S6: 10.5 parts of main resin, 0.1 parts of wetting agent, 20 parts of ethyl acetate and 5 parts of propylene glycol monomethyl ether were added to the above reaction kettle in sequence, and stirred at 60° C. for 2 hours to obtain laser transfer coating.

[0137] Table 6

[0138]

[0139] Comparative Example 3

[0140] This comparative example is used to compare and illustrate a laser transfer coating and a preparation method thereof disclosed in the present invention, and includes the following steps:

[0141] Comparative Example 3: Laser transfer coating was prepared according to the materials, material addition amounts and corresponding material numbers in Table 6:

[0142] S1: Mix materials 1 to 4 evenly to make a mixed monomer, take 1 / 3 of the mixed monomer and 1 / 2 of material 6 and add them into the reactor, stir slowly and heat to 70°C under nitrogen atmosphere;

[0143] S2: Mix the remaining part of the mixed monomer, 2 / 3 of material 5, the remaining part of material 6, and material 7 evenly, place them in a high-level tank, drip them at a uniform speed for 4 hours, and keep them warm for 1 hour;

[0144] S3: Add the remaining portion of material 5, raise the temperature to 75°C and keep reacting for 2.5 hours.

[0145] S4: Cool down to 55°C, adjust the solid content to 50 parts, filter out the material, and obtain the main resin.

[0146] S5: Add 60 parts of ethyl acetate into a reaction kettle, heat it to 65°C, add 4.4 parts of cellulose acetate butyrate, and stir at 200 rpm for 2 hours until it is completely dissolved.

[0147] S6: 10.5 parts of main resin, 0.1 parts of wetting agent, 20 parts of ethyl acetate and 5 parts of propylene glycol monomethyl ether were added to the above reaction kettle in sequence, and stirred at 60° C. for 2 hours to obtain laser transfer coating.

[0148] Comparative Example 4

[0149] This comparative example uses commercially available laser transfer coating to compare and illustrate a laser transfer coating and a preparation method thereof disclosed in the present invention.

[0150] Performance Testing

[0151] The laser transfer coatings prepared in the above Examples 1 to 3 and Comparative Examples 1 to 4 were subjected to the following performance tests:

[0152] Test coating effect:

[0153] The leveling effect was tested using a 200 mesh ceramic roller on the coater.

[0154] Coating transfer brightness and reflectivity test:

[0155] A laser layer is coated on the PET film, and the information layer is transferred by a small molding machine and then aluminum is plated. The coating with holographic information is then transferred to the hard cardboard. After the PET film is peeled off, the brightness and reflectivity of the cardboard with the transfer coating are tested.

[0156] Coating pressure resistance test:

[0157] Coat a laser layer on the PET film, perform long-term molding on a small molding machine, and observe the degree of change in the molding brightness of the coating.

[0158] Temperature point (softening point) test:

[0159] Coat a laser layer on the PET film, and perform molding on a small molding machine at different temperatures, taking the lowest temperature when the molding brightness is ≥85.

[0160] Coating adhesion test:

[0161] Coat the PET film with a laser layer, and perform a high-temperature plate-forming test on a small-scale molding machine to observe the degree of adhesion of the coating.

[0162] Storage stability test:

[0163] Place 150 g of the coating sample in a 50°C oven for 15 days and observe whether there is precipitation or viscosity increase.

[0164] Adhesion test between coating and offset UV ink after transfer:

[0165] After the laser coating is aluminum-plated, it is laminated on the cardboard with glue. The PET film is peeled off, and UV ink is printed on the release layer with a small offset printing machine. After it is fully cured, a hundred grids are drawn and 3M tape is used to test the ratio of the glue to pull off the ink.

[0166] The test results obtained are entered in Table 7.

[0167] Table 7

[0168]

[0169] From the test results in Table 7, it can be seen that the test results of Examples 1 to 3 are better than those of Comparative Examples 1 to 4 as a whole, and the brightness of the laser transfer coatings prepared in Examples 1 to 3 is further improved at a molding temperature higher than the temperature point. The reason is that the first functional monomer is added to the main resin of the laser transfer coatings in Examples 1 to 3, and the combination of the acrylate monomer and the first functional monomer has good optical properties, thereby enhancing the gloss and brightness of the coating coating; from the test results of Example 2, it can be seen that the offset ink adhesion test results of the laser transfer coating prepared in Example 2 after transfer are compared with those of Example 1 and Example 3. The offset ink of Example 2 falls off after transfer, and its adhesion is relatively poor. The reason is that the second functional monomer added in Example 2 in the preparation of the coating is relatively small, which affects the printability of its laser transfer coating;

[0170] The second functional monomer is not added to the laser transfer coating prepared in Comparative Example 1, and compared with Examples 1 to 3, the adhesion of the offset ink after transfer is poor; the first functional monomer and the second functional monomer are not added to the laser transfer coating prepared in Comparative Example 2, and it can be seen from the test results of Comparative Example 2 that its brightness decreases after molding above the temperature point, and its overall properties such as stickiness, pressure resistance, and adhesion of the offset ink after transfer are also poor; Comparative Example 3 does not add the first functional monomer, and its molding brightness above the temperature point is also poor; Comparative Example 4 is tested using commercially available laser transfer coatings, and it can be seen from the test results that its temperature point is high, and even if it is treated at a molding temperature of 180°C, the molding brightness of Comparative Example 4 only reaches 85, which is still not as excellent as the molding brightness of the laser transfer coating prepared by the embodiments of the present invention.

[0171] In summary, in the present invention, by adding a plurality of monomers with excellent refractive index to the provided laser transfer coating, the coating can improve its adhesion to offset ink while exerting excellent optical properties.

[0172] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser transfer coating, characterized in that: The main resin comprises the following mass components: Acrylate monomer 20.0~42.5 parts 2.5~25 parts of the first functional monomer 0.05~2.5 parts of the second functional monomer Initiator 0.05~2.5 parts 50-55 parts of the first solvent; The first functional monomer includes one or more of o-phenylphenoxyethyl acrylate, 2-phenoxyethyl methacrylate, ethoxylated bisphenol A diacrylate, propoxylated bisphenol A diacrylate and 4-biphenylmethanol acrylate; The acrylic acid ester monomers include two or more of methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate and isobutyl methacrylate; The second functional monomer includes an unsaturated monomer containing a heterocyclic side group or a polar group, and the second functional monomer includes one or more of N-acryloylmorpholine, N-vinylpyrrolidone, and 1-methacryloyloxy-3-adamantanol.

2. The laser transfer coating according to claim 1, characterized in that: The initiator includes one or more of dibenzoyl peroxide, dilauroyl peroxide, tert-butyl peroxy-2-ethylhexanoate, azobisisobutyronitrile, azobisisoheptanenitrile and dimethyl azobisisobutyrate; and / or, the first solvent includes one or more of ethyl acetate, butyl acetate, n-propyl acetate, butanone, methyl isobutyl ketone, propylene glycol monomethyl ether and isopropanol.

3. The laser transfer coating according to claim 1, characterized in that: Includes the following quality components: Main resin 10.5~26.6 parts Auxiliary resin 4.4~11.4 parts Additives 0.1~2 parts 60-85 parts of the second solvent.

4. The laser transfer coating according to claim 3, characterized in that: The auxiliary resin includes one or more of cellulose acetate butyrate, cellulose acetate propionate, nitrocellulose, and chloroacetic acid resin; and / or the auxiliary agent includes one or more of a defoamer, a leveling agent, and a wetting agent.

5. The laser transfer coating according to claim 4, characterized in that: The second solvent includes one or more of ethyl acetate, butyl acetate, n-propyl acetate, butanone, methyl isobutyl ketone, propylene glycol monomethyl ether and isopropyl alcohol.

6. The method for preparing the laser transfer coating according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Evenly mix the acrylic ester monomer, the first functional monomer, and the second functional monomer to obtain a mixed monomer, take 1 / 3 of the mixed monomer and mix it with part of the first solvent and add it into a reaction kettle, slowly stir it under a nitrogen atmosphere and heat it to 50-90° C.; S2: The remaining mixed monomers are evenly mixed with the remaining first solvent and 2 / 3 of the initiator, placed in a high-level tank, and dripped at a uniform speed for 2-5 hours, and kept warm for reaction for 1-2 hours; S3: Add the remaining initiator, raise the temperature to 55-95°C, and keep the temperature for 2-4 hours; S4: Cooling to 50-60°C, adding solvent to adjust solid content, filtering the material to obtain the main resin; S5: taking the second solvent, the auxiliary resin and the main resin, dissolving and mixing them to obtain the laser transfer coating.

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