A thermal sublimation retransfer film for glass substrates

Abstract

The present invention relates to the field of thermal transfer technology, and in particular, to a thermal sublimation retransfer film for glass substrates. The thermal sublimation retransfer film comprises a substrate, a primer layer and a dye receiving layer; the components of the dye receiving layer include a first main resin and a first auxiliary resin; the first main resin is one of halogenated resins such as polyvinyl chloride, polyvinylidene chloride, and vinyl chloride-vinyl acetate copolymer; the first auxiliary resin is one or more of thermoplastic polyurethane resin, acrylic resin, and acrylic modified resin. The thermal sublimation retransfer film can ensure high color concentration when used for thermal sublimation soft label printing, and can also directly thermally transfer patterns to the surface of an untreated glass substrate.

Description

Technical Field

[0001] The invention relates to the technical field of thermal transfer, in particular to a thermal sublimation retransfer film for glass substrates. Background Art

[0002] Thermal transfer film is a special printing film that has a pattern pre-printed on the surface of a PET film. Under the combined action of heat and pressure, the pattern is transferred and attached to the surface of the substrate. It is often used to replace screen printing technology because it can achieve a perfect transition of colors.

[0003] At present, there is no retransfer film on the market that can be directly transferred to glass substrates after thermal sublimation printing. The main reasons are the following: 1. Thermal sublimation ribbon image printing requires a special dye receiving coating, otherwise the color concentration is very low. 2. The surface of the substrate is complicated, and it is often necessary to pre-heat transfer a layer of coating on its surface to improve the adhesion of the substrate surface before the pattern can be re-transferred. Therefore, this method has the defects of cumbersome operation process and high cost. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a thermal sublimation retransfer film for glass substrates.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] The present invention provides a thermal sublimation retransfer film for glass substrates, comprising a substrate, a primer layer arranged on the substrate, and a dye receiving layer arranged on the primer layer;

[0007] The dye receiving layer comprises a first main resin and a first auxiliary resin;

[0008] The first main resin is one of polyvinyl chloride, polyvinylidene chloride, polyvinyl chloride, pervinyl chloride, chlorinated polyvinyl chloride, and vinyl chloride-vinyl acetate copolymer; the first auxiliary resin is one or more of thermoplastic polyurethane resin, acrylic resin, and acrylic modified resin.

[0009] Furthermore, the first main resin is vinyl chloride-vinyl acetate copolymer; the first auxiliary resin is thermoplastic polyurethane, the mass fraction of vinyl chloride-vinyl acetate copolymer is 10-80 parts, and the mass fraction of thermoplastic polyurethane is 1 part-15 parts.

[0010] Furthermore, in the vinyl chloride-vinyl acetate copolymer, the molar mass ratio of vinyl chloride monomer to vinyl acetate monomer is in the range of 80:20-90:10.

[0011] Furthermore, the components of the dye receiving layer also include an adhesion promoter, a plasticizer, a release agent and a first organic solvent; the mass fraction of the adhesion promoter is 1-3 parts, the mass fraction of the plasticizer is 1-5 parts, the mass fraction of the release agent is 1-5 parts, and the mass fraction of the first organic solvent is 50-80 parts.

[0012] Furthermore, the adhesion promoter is a resin adhesion promoter, a silane coupling agent adhesion promoter or a titanate coupling agent adhesion promoter.

[0013] Further, the composition of the primer layer includes a second main resin and a second auxiliary resin;

[0014] The second main resin is polyvinyl chloride, polyvinylidene chloride, polyvinyl chloride, pervinyl chloride, chlorinated polyvinyl chloride, vinyl chloride-vinyl acetate copolymer; the second auxiliary resin is one of polyurethane resin, polyester resin, polycarbonate resin and acrylic resin.

[0015] Furthermore, the second main resin is a vinyl chloride-vinyl acetate copolymer; the second auxiliary resin is a polyurethane resin; the mass fraction of the vinyl chloride-vinyl acetate copolymer is 10 parts to 80 parts, and the mass fraction of the polyurethane resin is 2 parts to 4 parts.

[0016] Furthermore, the ingredients of the primer layer also include an anti-hydrolysis stabilizer, a fluorescent whitening agent and a second organic solvent;

[0017] The mass fraction of the anti-hydrolysis agent is 1 part to 5 parts, the mass fraction of the fluorescent whitening agent is 0.05 parts to 0.1 parts, and the mass fraction of the second organic solvent is 50 parts to 80 parts.

[0018] Furthermore, the thickness of the dye receiving layer is 5-15 μm, and the thickness of the primer layer is 1-5 μm.

[0019] Furthermore, the material of the substrate is PET; the thickness of the substrate 1 is 20-125 μm, and the weight is 30-100 g / m 2 .

[0020] The beneficial effects of the present invention are:

[0021] (1) The thermal sublimation retransfer film for glass substrates of the present invention has a dye receiving layer whose first main resin is one of halogenated resins such as polyvinyl chloride, polyvinylidene chloride, and vinyl chloride-vinyl acetate copolymer; the first auxiliary resin is one or more of thermoplastic polyurethane resin, acrylic resin, and acrylic modified resin; the above resin components can improve the adhesion of the dye on the surface of the glass substrate after being transferred to the glass substrate;

[0022] (2) The thermal sublimation retransfer film for glass substrates of the present invention has a second main resin in the composition of the base coat layer, which is a halogenated resin such as polyvinyl chloride, polyvinylidene chloride, or vinyl chloride-vinyl acetate copolymer; its main function is to give the dye receiving layer a certain adhesion during the thermal sublimation printing process, to ensure that the dye receiving layer will not peel off from the substrate under high-speed printing, and to solve the problem of interlayer adhesion;

[0023] (3) The thermal sublimation retransfer film for glass substrates of the present invention can ensure high color concentration while being used for thermal sublimation soft label printing, and can also directly thermally transfer patterns to the surface of untreated glass substrates. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a schematic diagram of the structure of each layer of the thermal sublimation retransfer film for glass substrates of the present invention.

[0025] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0026] 1. Substrate; 2. Primer; 3. Dye receiving layer. DETAILED DESCRIPTION

[0027] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0028] like Figure 1 As shown, the thermal sublimation retransfer film for glass substrates of the present invention comprises a substrate 1, a primer layer 2 arranged on the substrate 1, and a dye receiving layer 3 arranged on the primer layer 2; the components of the dye receiving layer 3 include a dye receiving resin and a bonding resin; wherein the components of the dye receiving layer 3 include a first main resin and a first auxiliary resin; the first main resin is one of a halogenated resin such as polyvinyl chloride, polyvinylidene chloride, and a vinyl chloride-vinyl acetate copolymer; the first auxiliary resin is one or more of a thermoplastic polyurethane resin, an acrylic resin, and an acrylic modified resin. wherein the halogenated resin may also be selected from polyvinyl chloride, perchloroethylene, and chlorinated polyvinyl chloride.

[0029] The thermal sublimation retransfer film of the present invention can improve the adhesion of the dye on the surface of the glass substrate after being transferred to the glass substrate by using the first main resin of the above-mentioned composition as a component of the dye receiving layer 3. Unlike metal, the surface of glass is smoother, resulting in a lower diffusion adhesion of the coating. In addition, since the empty orbits of the metal atoms can form coordination bonds and the covalent bonds and coordination bonds formed by the oxides on the metal surface can increase its adhesion, and glass lacks such properties, resulting in a relatively difficult coating adhesion. Therefore, the use of the first auxiliary resin of the above-mentioned composition can make it more suitable for transfer to glass substrates.

[0030] The thermal sublimation retransfer film of the present invention is particularly suitable for soft label printing.

[0031] In the dye receiving layer 3 of the present invention, the main function of the resin component is to have good adhesion to the surface of the glass substrate in addition to receiving the thermal sublimation dye.

[0032] Preferably, the first main resin is vinyl chloride-vinyl acetate copolymer; the first auxiliary resin is thermoplastic polyurethane; in the vinyl chloride-vinyl acetate copolymer, the molar mass ratio of vinyl chloride monomer to vinyl acetate monomer is in the range of 80:20-90:10.

[0033] Preferably, the mass parts of each component of the dye receiving layer 3 of the present invention are: the components of the dye receiving layer 3 also include an adhesion promoter, a plasticizer, a release agent and a first organic solvent; the mass parts of each component of the dye receiving layer 3 are: 10-80 parts of vinyl chloride-vinyl acetate copolymer, 1 part-15 parts of thermoplastic polyurethane, 1 part-3 parts of adhesion promoter, 1 part-5 parts of plasticizer, 1 part-5 parts of release agent, and 50 parts-80 parts of the first organic solvent.

[0034] Further preferably, the content of vinyl chloride-vinyl acetate copolymer is 15-70 parts, and even more preferably, the content is 15-25 parts.

[0035] More preferably, the content of thermoplastic polyurethane is 3-10 parts.

[0036] Among them, the adhesion promoter can improve the adhesion of the dye receiving layer 3 on the surface of the substrate 1, the plasticizer can improve the softness and plasticity of the dye receiving layer 3 on the surface of the substrate 1, and the anti-sticking agent can be used for anti-sticking, which can prevent the dye receiving layer 3 and the ribbon from sticking together due to heating and melting of the resin during printing.

[0037] Preferably, the adhesion promoter may be a resin adhesion promoter, a silane coupling agent adhesion promoter or a titanate coupling agent adhesion promoter.

[0038] Further preferably, in one embodiment of the present invention, a resin adhesion promoter is used. This type of adhesion promoter contains hydroxyl, carboxyl, ether bond or chlorinated resin, sulfonylamino and other solvent-based resins, has good compatibility with general resins, and can form a certain chemical bond with the substrate, thereby improving adhesion; in addition, these additives themselves are combined with the coating film through mutual dissolution, entanglement and other effects in the coating film to improve adhesion.

[0039] Preferably, the anti-sticking agent can generally be selected from liquid lubricants or solid lubricants, such as polyethylene wax, amide wax, Teflon (registered trademark) powder and other solid waxes, fluorine or phosphate surfactants, silicone oil, reactive silicone oil and curable silicone oil and other modified silicone oils, etc., preferably modified silicone oil.

[0040] Generally speaking, there is no particular limitation on the first organic solvent of the dye receiving layer 3, as long as the resin component can be dissolved in a suitable organic solvent and the viscosity at 25° C. is within 100-500 mPa·s. For example, the first organic solvent can be selected from acetone, 2-butanone, cyclohexanone, isophorone, tetrahydrofuran, ethyl acetate, butyl acetate, propyl acetate, toluene, xylene, DMF, etc.

[0041] Further preferably, the first organic solvent is a mixed solution of 2-butanone and toluene, and the mass ratio of 2-butanone to toluene is controlled between 8:2 and 1:1.

[0042] Preferably, the thickness of the dye receiving layer 3 is 5-15 μm; more preferably, the thickness of the dye receiving layer 3 is 5-10 μm.

[0043] In the primer layer 2 of the present invention, the main function of the resin component is, on the one hand, to give the dye receiving layer 3 a certain adhesion during the thermal sublimation printing process, to ensure that the dye receiving layer 3 will not peel off from the substrate 1 under high-speed printing, and to solve the problem of interlayer adhesion. On the other hand, it is to give the transferred pattern a certain solvent resistance and friction resistance.

[0044] Preferably, the components of the primer layer 2 include a second main resin and a second auxiliary resin; the second main resin is a halogenated resin such as polyvinyl chloride, polyvinylidene chloride, or vinyl chloride-vinyl acetate copolymer; the second auxiliary resin is one of polyurethane resin, polyester resin, polycarbonate resin and acrylic resin.

[0045] Preferably, the second main resin is vinyl chloride-vinyl acetate copolymer; and the second auxiliary resin is polyurethane resin.

[0046] Preferably, in the vinyl chloride-vinyl acetate copolymer, the molar mass ratio of vinyl chloride monomer to vinyl acetate monomer is in the range of 80:20-90:10.

[0047] Preferably, the components of the primer layer 2 also include an anti-hydrolysis stabilizer, a fluorescent brightener and a second organic solvent; the mass proportions of the components of the primer layer 2 are 10-80 parts of vinyl chloride-vinyl acetate copolymer, 2-4 parts of polyurethane resin, 1-5 parts of anti-hydrolysis agent, 0.05-0.1 parts of fluorescent brightener and 50-80 parts of the second organic solvent.

[0048] Among them, the anti-hydrolysis stabilizer can effectively improve the storage stability of the thermal transfer film, and the fluorescent brightener can improve the brightness of the dye receiving layer.

[0049] Further preferably, the content of vinyl chloride-vinyl acetate copolymer is 15-70 parts, and even more preferably, the content is 15-25 parts.

[0050] More preferably, the content of the anti-hydrolysis agent is 1-2.5 parts.

[0051] There is no particular limitation on the type of the second organic solvent, as long as the resin component of the undercoat layer 2 can be dissolved in a suitable organic solvent and the viscosity at 25° C. is within 100-500 mPa·s. For example, the organic solvent may be acetone, 2-butanone, cyclohexanone, ethyl acetate, butyl acetate, propyl acetate, toluene, xylene, DMF, etc.

[0052] Preferably, the second organic solvent is a mixed solution of 2-butanone and toluene, and the ratio of 2-butanone to toluene is controlled between 8:2 and 1:1.

[0053] Preferably, the thickness of the primer layer 2 is 1-5 μm; more preferably, the thickness of the primer layer 2 is 1-3 μm.

[0054] The material of the substrate 1 of the present invention is PET, which is a common material used for packaging printing on the market.

[0055] Preferably, the thickness of the substrate 1 is 20-125 μm, and the weight is 30-100 g / m 2 .

[0056] The technical solution of the present invention is illustrated by means of specific embodiments below:

[0057] Embodiment 1:

[0058] The retransfer film of this embodiment has a base 1 with a thickness of 50 μm and a weight of 35 g / m 2 PET film, the manufacturer is Guangdong Shunming Products.

[0059] The specific components and weight percentages of the primer layer 2 are: 18 parts of vinyl chloride-vinyl acetate copolymer (CP710 Hanwha, South Korea), 2 parts of polyurethane (TPU-5778 Lubrizol), 0.5 parts of anti-hydrolysis stabilizer (RelysorbTMStab2 Ruilian New Materials Co., Ltd.), 0.2 parts of fluorescent brightener (OB-1 Bojian Fine Chemical), 39.65 parts of 2-butanone, and 39.65 parts of toluene. The coating was applied by a gravure coater, and the coating thickness was 2 μm.

[0060] The specific components and mass fractions of the dye receiving layer 3 are: 15 parts of vinyl chloride-vinyl acetate copolymer (MLC-10-80 Pangao Chemical), 5 parts of polyurethane (901H Wanhua Chemical), 0.2 parts of epoxy-modified silicone oil (KF-105 Shin-Etsu Silicone), 0.5 parts of anti-hydrolysis stabilizer (RelysorbTMStab2 Ruilian New Materials Co., Ltd.), 0.3 parts of plasticizer (A110 Maoheng Chemical), 1 part of adhesion promoter (LTW Digao Chemical), 38.0 parts of 2-butanone, and 38.0 parts of toluene. The coating was applied using a gravure coater, and the coating thickness was 58 μm.

[0061] Example 2

[0062] The retransfer film of this embodiment has a base 1 with a thickness of 50 μm and a weight of 35 g / m 2 PET film, the manufacturer is Guangdong Shunming Products.

[0063] The specific components and mass fractions of the primer layer 2 are: 16 parts of vinyl chloride-vinyl acetate copolymer (CP710 Hanwha, South Korea), 4 parts of polyurethane (TPU-5778 Lubrizol), 0.5 parts of anti-hydrolysis stabilizer (RelysorbTMStab2 Ruilian New Materials Co., Ltd.), 0.2 parts of fluorescent brightener (OB-1 Bojian Fine Chemical), 39.65 parts of 2-butanone, and 39.65 parts of toluene. The coating was applied using a gravure coater, and the coating thickness was 2 μm.

[0064] The scheme of the dye receiving layer 3 is the same as that of Example 1.

[0065] Example 3

[0066] The retransfer film of this embodiment has a base 1 with a thickness of 50 μm and a weight of 35 g / m 2 PET film, the manufacturer is Guangdong Shunming Products.

[0067] The scheme of the primer layer 2 is consistent with that of Example 1.

[0068] The specific components and mass fractions of the dye receiving layer 3 are: 15 parts of vinyl chloride-vinyl acetate copolymer (MLC-10-80 Pangao Chemical), 5 parts of epoxy-modified acrylic resin (SWA 5101 Kunshan Sanwang Resin Co., Ltd.), 5 parts of polyurethane (901H Wanhua Chemical), 0.2 parts of epoxy-modified silicone oil (KF-105 Shin-Etsu Silicone), 0.5 parts of anti-hydrolysis stabilizer (RelysorbTMStab2 Ruilaien New Materials Co., Ltd.), 0.3 parts of plasticizer (A110 Maoheng Chemical), 1 part of adhesion promoter (LTW Digao Chemical), 35.5 parts of 2-butanone, and 35.5 parts of toluene. Use a gravure coater to coat, and the coating thickness is 5 μm.

[0069] Example 4

[0070] The retransfer film of this embodiment has a base 1 with a thickness of 50 μm and a weight of 35 g / m 2 PET film, the manufacturer is Guangdong Shunming Products.

[0071] The scheme of the primer layer 2 is consistent with that of Example 2.

[0072] The specific components and mass fractions of the dye receiving layer 3 are: 15 parts of vinyl chloride-vinyl acetate copolymer (MLC-10-80 Pangao Chemical), 5 parts of epoxy-modified acrylic resin (SWA 5101 Kunshan Sanwang Resin Co., Ltd.), 5 parts of polyurethane (901H Wanhua Chemical), 0.2 parts of epoxy-modified silicone oil (KF-105 Shin-Etsu Silicone), 0.5 parts of anti-hydrolysis stabilizer (RelysorbTMStab2 Ruilaien New Materials Co., Ltd.), 0.3 parts of plasticizer (A110 Maoheng Chemical), 1 part of adhesion promoter (LTW Digao Chemical), 35.5 parts of 2-butanone, and 35.5 parts of toluene. The coating was applied using a gravure coater, and the coating thickness was 5 μm.

[0073] Comparative Example 1

[0074] The retransfer film of this comparative example has a substrate 1 with a thickness of 50 μm and a gram weight of 35 g / m 2 PET film, the manufacturer is Guangdong Shunming Products.

[0075] There is no primer layer 2 and dye receiving layer 3.

[0076] Comparative Example 2

[0077] The retransfer film of this comparative example 2 has a substrate 1 with a thickness of 50 μm and a gram weight of 35 g / m 2 PET film, the manufacturer is Guangdong Shunming Products.

[0078] There is no primer layer 2, and the dye receiving layer 3 is the same as in Example 1.

[0079] Comparative Example 3

[0080] The retransfer film of this comparative example 3 has a substrate 1 with a thickness of 50 μm and a gram weight of 35 g / m 2 PET film, the manufacturer is Guangdong Shunming Products.

[0081] There is no primer layer 2, and the dye receiving layer 3 is the same as in Example 3.

[0082] Comparative Example 4

[0083] The retransfer film of this comparative example 4 has a substrate 1 with a thickness of 50 μm and a gram weight of 35 g / m 2 PET film, the manufacturer is Guangdong Shunming Products.

[0084] The specific components and weight fractions of the primer layer 2 are: 20 parts of vinyl chloride-vinyl acetate copolymer (CP710 Hanwha, South Korea), 0.5 parts of anti-hydrolysis stabilizer (RelysorbTM Stab2 Ruilian New Materials Co., Ltd.), 0.2 parts of fluorescent brightener (OB-1 Bojian Fine Chemical), 39.65 parts of 2-butanone, and 39.65 parts of toluene. The coating was applied using a gravure coater, and the coating thickness was 2 μm.

[0085] The dye receiving layer 3 is the same as that of Example 1.

[0086] Comparative Example 5

[0087] The retransfer film of this comparative example 5 has a substrate 1 with a thickness of 50 μm and a gram weight of 35 g / m 2 PET film, the manufacturer is Guangdong Shunming Products.

[0088] The specific components and mass fractions of the primer layer 2 are: 20 parts of polyurethane (TPU-5778 Lubrizol), 0.5 parts of anti-hydrolysis stabilizer (RelysorbTMStab2 Ruilian New Materials Co., Ltd.), 0.2 parts of fluorescent brightener (OB-1 Bojian Refining Chemical), 39.65 parts of 2-butanone, and 39.65 parts of toluene. The coating was applied using a gravure coater, and the coating thickness was 2 μm.

[0089] The dye receiving layer 3 is the same as that of Example 1.

[0090] Comparative Example 6

[0091] The retransfer film of this comparative example 6 uses a PET film with a thickness of 50 μm and a gram weight of 35 g / m2 as substrate 1, and the manufacturer is Guangdong Shunming Products.

[0092] The specific components and mass fractions of the primer layer 2 are: 10 parts of vinyl chloride-vinyl acetate copolymer (CP710 Hanwha, South Korea), 10 parts of polyurethane (TPU-5778 Lubrizol), 0.5 parts of anti-hydrolysis stabilizer (RelysorbTMStab2 Ruilian New Materials Co., Ltd.), 0.2 parts of fluorescent brightener (OB-1 Bojian Refining), 39.65 parts of 2-butanone, 39.65 parts of toluene, and coated with a gravure coater, with a coating thickness of 2 μm. Coated with a gravure coater, the coating thickness is 2 μm.

[0093] The dye receiving layer 3 is the same as that of Example 1.

[0094] Comparative Example 7

[0095] The retransfer film of this comparative example 7 has a substrate 1 with a thickness of 50 μm and a gram weight of 35 g / m 2 PET film, the manufacturer is Guangdong Shunming Products.

[0096] The specific components and weight fractions of the primer layer 2 are: 19.5 parts of vinyl chloride-vinyl acetate copolymer (CP710 Hanwha, South Korea), 0.5 parts of polyurethane (TPU-5778 Lubrizol), 0.5 parts of anti-hydrolysis stabilizer (RelysorbTMStab2 Ruilian New Materials Co., Ltd.), 0.2 parts of fluorescent brightener (OB-1 Bojian Fine Chemical), 39.65 parts of 2-butanone, and 39.65 parts of toluene. The coating was applied using a gravure coater, and the coating thickness was 2 μm.

[0097] The dye receiving layer 3 is the same as that of Example 1.

[0098] The retransfer films of the above-mentioned embodiments and comparative examples were subjected to performance tests. The specific performance test scheme is as follows. The test results are shown in Table 1.

[0099] The printing test was conducted using a DNP DS620 thermal sublimation printer, the original DNP DS620 ribbon was used, the color density test pattern was a 255 grayscale image, and the print sample size was 6×6 inches. The color density was tested using an X-Rite i1-PRO3 colorimeter, and the number of test points was 256 (16×16). The color density was the average of 256 points.

[0100] The coating is transferred to a flat or curved glass substrate by vacuum heating, and then tested for adhesion with a German BYK cross-cut knife at 120°C and 1 atm for 10 seconds. The test level is based on the ISO2409 cross-cut test standard, as shown below:

[0101] 0: The cutting edge is completely smooth; no grid is missing.

[0102] 1: A small amount of coating falls off at the cross-cutting area. The cross-cutting area affected cannot be greater than 5%.

[0103] 2: Coating is peeling off at the cut edges and / or intersections. The affected cut area is greater than 5% but less than 15%.

[0104] 3: The coating has partially or completely fallen off in large pieces along the cut edge and / or partially or completely fallen off in different parts of the grid. The affected cut area is greater than 15% but less than 35%.

[0105] 4: Coating is falling off in large pieces along the cut edge and / or some cells are partially or completely falling off. The affected cut area is greater than 35% but less than 65%.

[0106] 5: Any degree of shedding beyond Level 4.

[0107] The friction resistance test was conducted on the samples using the MCJ-01A friction tester independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd. The friction pressure was 20±0.2N, the friction speed was 43 times / min, and the number of frictions was 40 times. The wear resistance of the samples was determined by visual inspection, and the criteria are as follows:

[0108] √: The ink layer on the printed surface does not show through (fade) or stain the paper surface due to friction;

[0109] ×: The ink layer on the printed surface is exposed (fading) or the paper surface is stained due to friction.

[0110] The solvent resistance test is to tie a white cotton gauze to the bottom of a 1.0KGF tool, dip it in 95% alcohol, and then use the white cotton gauze to move back and forth 300 times on the printed pattern. Use the X-Rite i1-PRO3 colorimeter to test the optical density before and after solvent friction, and calculate the ratio of optical density after test / optical density before test. The judgment criteria are as follows:

[0111] √: Optical density after test / optical density before test ≥ 0.8;

[0112] ×: Optical density after test / optical density before test < 0.8.

[0113] Table 1 Performance test results of Examples 1-5 and Comparative Examples 1-7

[0114]

[0115] From the test results, it can be found that the color density of the retransfer film is not only close to that of the DNP original photo paper, but also has good adhesion, solvent resistance and friction resistance after transfer.

[0116] 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, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermal sublimation retransfer film for glass substrates, comprising a substrate (1), a primer layer (2) disposed on the substrate (1), and a dye receiving layer (3) disposed on the primer layer (2); characterized in that: The dye receiving layer (3) comprises a first main resin and a first auxiliary resin; The first main resin is a vinyl chloride-vinyl acetate copolymer; the first auxiliary resin is a thermoplastic polyurethane, the mass fraction of the vinyl chloride-vinyl acetate copolymer is 10 to 80 parts, and the mass fraction of the thermoplastic polyurethane is 1 to 15 parts; In the vinyl chloride-vinyl acetate copolymer, the molar mass ratio of vinyl chloride monomer to vinyl acetate monomer is in the range of 80:20-90:10; The composition of the primer layer (2) includes a second main resin and a second auxiliary resin; The second main resin is a vinyl chloride-vinyl acetate copolymer; the second auxiliary resin is a polyurethane resin; the mass fraction of the vinyl chloride-vinyl acetate copolymer is 10 parts to 80 parts, and the mass fraction of the polyurethane resin is 2 parts to 4 parts.

2. The thermal sublimation retransfer film for glass substrates according to claim 1, characterized in that: The components of the dye receiving layer (3) also include an adhesion promoter, a plasticizer, an anti-sticking agent and a first organic solvent; the mass fraction of the adhesion promoter is 1 to 3 parts, the mass fraction of the plasticizer is 1 to 5 parts, the mass fraction of the anti-sticking agent is 1 to 5 parts, and the mass fraction of the first organic solvent is 50 to 80 parts.

3. The thermal sublimation retransfer film for glass substrates according to claim 2, characterized in that: The adhesion promoter is a resin adhesion promoter, a silane coupling agent adhesion promoter or a titanate coupling agent adhesion promoter.

4. The thermal sublimation retransfer film for glass substrates according to claim 1, characterized in that: The components of the base coating (2) further include an anti-hydrolysis stabilizer, a fluorescent whitening agent and a second organic solvent; The mass fraction of the anti-hydrolysis agent is 1 to 5 parts, the mass fraction of the fluorescent whitening agent is 0.05 to 0.1 parts, and the mass fraction of the second organic solvent is 50 to 80 parts.

5. The thermal sublimation retransfer film for glass substrates according to any one of claims 1 to 4, characterized in that: The thickness of the dye receiving layer (3) is 5-15 μm, and the thickness of the primer layer (2) is 1-5 μm.

6. The thermal sublimation retransfer film for glass substrates according to any one of claims 1 to 4, characterized in that: The material of the substrate (1) is PET; the thickness of the substrate (1) is 20-125 μm, and the weight is 30-100 g / m 2 .

Images