Soft label imaging material with high color density and high uniformity and preparation method thereof

Abstract

The invention relates to a high-color-density and high-uniformity soft label imaging material and a preparation method thereof, and relates to the technical field of printing supplies. The soft label imaging material sequentially comprises a back coating layer, a base material, a bottom coating layer and a dye layer from top to bottom, the back coating comprises the following components: back coating resin, a lubricant and a first solid filler; the bottom coating layer comprises the following components: bottom coating layer resin; the dye layer comprises the following components: bonding resin, dye, a solid lubricant and a second solid filler. The invention provides a soft label imaging material, namely a thermal dye sublimation colored tape for soft label printing, and the color density is improved under the condition that the printing uniformity of the colored tape is not influenced by increasing the relative content of the dye relative to the bonding resin; the uniformity of the light color gradation of the printed image-text is improved by adding a solid lubricating agent into the dye layer; therefore, the thermal dye sublimation ribbon has high color density and high uniformity in the application of soft label printing at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of printing consumables, and in particular to a soft-label imaging material with high color density and high uniformity and a preparation method thereof. Background Art

[0002] Thermal sublimation printing technology mainly uses heat energy to transfer yellow, magenta and cyan dyes to the printing medium, and obtains different shades of color by controlling the temperature of the print head, and forms a continuous color scale by superimposing the three colors. Its printing effect is more delicate than inkjet printing, and has higher color continuity and reproduction than traditional printing through halftone printing of dot superposition.

[0003] At present, the application range of thermal sublimation ribbons on the market is relatively wide, such as soft labels, ID cards, photo printing and other fields, but it mainly has the following problems: on the one hand, the solubility of thermal sublimation dyes is very low. Adding dyes within the solubility range can easily cause the printing color concentration of the ribbon to fail to meet the requirements; on the other hand, adding dyes beyond the solubility range can easily cause the dye to precipitate when the ribbon is printed, resulting in poor uniformity of the printed image.

[0004] There are three main existing solutions: (1) increasing the amount of dye added to increase the print color density, but this solution will reduce the print uniformity; (2) increasing the thickness of the dye layer to increase the print color density, but this solution will reduce the heat transfer effect of the ribbon, resulting in a decrease in the utilization rate of the dye, an increase in cost, and is not environmentally friendly; (3) adding sols such as aluminum oxide and silicon oxide to the base coat to prevent the migration of the dye to the base coat, thereby achieving the purpose of increasing the color density. This solution will reduce the adhesion between the base coat and the dye layer and increase the risk of the ribbon fading. In view of this, the present invention provides a soft label imaging material with high color density and high uniformity and a preparation method thereof. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a soft-label imaging material with high color density and high uniformity and a preparation method thereof.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] In a first aspect, a soft label imaging material with high color density and high uniformity, the soft label imaging material comprises, from top to bottom, a back coating layer, a substrate, a primer layer and a dye layer;

[0008] The back coating layer comprises the following components: a back coating layer resin, a lubricant, and a first solid filler; the lubricant accounts for 10%-40% of the weight of the back coating layer resin; the first solid filler accounts for 1%-5% of the weight of the back coating layer resin;

[0009] The base coating layer comprises the following components: a base coating layer resin;

[0010] The dye layer comprises the following components: an adhesive resin, a dye, a solid lubricant, and a second solid filler; the weight ratio of the dye to the adhesive resin is in the range of 1:1-2:1; the solid lubricant accounts for 0.3%-5% of the total amount of the adhesive resin and the dye; and the second solid filler accounts for 0.2%-0.4% of the total amount of the adhesive resin and the dye.

[0011] The beneficial effects of the present invention are as follows: the present invention provides a soft label imaging material, namely a thermal sublimation ribbon for soft label printing, which improves the color density without affecting the printing uniformity of the ribbon by increasing the relative content of the dye to the adhesive resin; improves the uniformity of the light color levels of the printed image and text by adding a solid lubricant to the dye layer; and enables the thermal sublimation ribbon to have the characteristics of high color density and high uniformity in the application of soft label printing.

[0012] Based on the above technical solution, the present invention can also be improved as follows.

[0013] Further, the back coating resin includes at least one of polyvinyl butyral (PVB) resin, cellulose resin, silicone-modified polyurethane, and polyamide resin;

[0014] The lubricant includes at least one of metal soap, phosphate ester, silicone oil (such as organic silicone oil), and a release agent;

[0015] The first solid filler includes at least one of silica, talc and kaolin.

[0016] Furthermore, the back coating resin includes polyvinyl butyral (PVB) resin and cellulose resin; the molecular weight of the polyvinyl butyral is 50000-60000, and the degree of polymerization is 300-1300;

[0017] The particle size of the first solid filler is 300 nm-5 μm.

[0018] Furthermore, the primer resin includes at least one of polyvinyl pyrrolidone, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, and methyl cellulose.

[0019] Furthermore, the dye layers are, from left to right, a yellow dye layer, a magenta dye layer, and a cyan dye layer.

[0020] Further, the adhesive resin includes at least one of polyvinyl pyrrolidone, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, methyl cellulose, polyurethane, polycarbonate, and polyester resin;

[0021] The magenta dye layer includes a magenta dye (Solvent Red 24); the yellow dye layer includes a yellow dye (Solvent Yellow 2); the cyan dye layer includes a cyan dye (Solvent Blue 36); the weight ratio of the magenta dye to the binding resin is 1.8:1-1.5:1, the weight ratio of the yellow dye to the binding resin is 1.4:1-1.2:1, and the weight ratio of the cyan dye to the binding resin is 2:1-1.8:1;

[0022] The solid lubricant includes a solid lubricant with a melting point of 60° C.-70° C.; the second solid filler includes polymethyl methacrylate (PMMA).

[0023] Furthermore, the solid lubricant includes at least one of pentaerythritol stearate, octadecyl erucamide, and erucamide.

[0024] In a second aspect, a method for preparing a soft-label imaging material with high color density and high uniformity comprises the following steps:

[0025] (1) preparing a back coating coating liquid by mixing the components of the back coating layer with a first solvent;

[0026] The components of the base coating layer are formulated with a second solvent to form a base coating liquid;

[0027] The components of the dye layer are mixed with a third solvent to form a dye layer coating liquid, wherein the dye layer coating liquid includes a magenta dye layer coating liquid, a yellow dye layer coating liquid and a cyan dye layer coating liquid;

[0028] (2) grinding the back coating liquid, coating it on one side of the substrate by a gravure coater, and drying it to obtain a back coating;

[0029] Applying the primer coating liquid on the other side of the substrate by a gravure coater, and drying to obtain a primer coating;

[0030] The yellow dye layer coating liquid, the magenta dye layer coating liquid and the cyan dye layer coating liquid are sequentially coated on the undercoat layer by a gravure coater and dried to obtain dye layers.

[0031] The beneficial effect of the above-mentioned solution adopted by the present invention is: the flatness of the back coating of the ribbon is improved by grinding, so that the heat transfer uniformity during ribbon printing is improved, thereby improving the uniformity of printed images and texts.

[0032] Further, the first solvent comprises a first butanone-toluene mixed solvent, wherein the mass ratio of butanone to toluene in the first butanone-toluene mixed solvent is 3:1-2:1; the first solvent accounts for 80%-90% of the weight of the back coating liquid;

[0033] The second solvent includes isopropyl alcohol; the second solvent accounts for 90%-98% by weight of the primer coating solution;

[0034] The third solvent comprises a second butanone-toluene mixed solvent, wherein the mass ratio of butanone to toluene in the second butanone-toluene mixed solvent is 1:1-1:3; the third solvent accounts for 80%-95% of the weight of the dye layer coating liquid.

[0035] The beneficial effect of the above-mentioned solution of the present invention is that the uniformity of the coating film surface is improved by adjusting the proportion of the third solvent.

[0036] Further, the back coating liquid is coated on one side of the substrate by a gravure coater to a coating thickness of 0.2 μm to 1 μm;

[0037] The grinding parameters are as follows: grinding speed 1200r / min-1800r / min, air pump pressure 0.1Mpa-0.3Mpa, time 30min-120min;

[0038] The primer coating liquid is coated on the other side of the substrate by a gravure coater to a coating thickness of 0.1 μm to 0.5 μm;

[0039] The yellow dye layer coating solution, the magenta dye layer coating solution and the cyan dye layer coating solution are sequentially coated on the undercoat layer by a gravure coater to a coating thickness of 0.3 μm-0.5 μm, 0.4 μm-0.6 μm and 0.6 μm-0.8 μm, respectively.

[0040] Furthermore, the substrate includes a polyethylene terephthalate film; the substrate is usually a commonly known material on the market with a certain degree of heat resistance and strength. The thickness of the substrate is 4μm-125μm, and the component of the substrate is a PET film. Preferably, the thickness of the PET film substrate is 4.3μm-12.5μm. Generally speaking, the substrate needs to be surface treated before the coating is directly applied on the substrate. Considering the cost, corona discharge treatment is generally used to make the dyne value of the substrate surface greater than 38. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic structural diagram of the soft label imaging material of the present invention. DETAILED DESCRIPTION

[0042] The principles and features of the present invention are described below, and the examples are only used to explain the present invention and are not used to limit the scope of the present invention. If no specific technology or conditions are specified in the embodiments, the technology or conditions described in the literature in this field or the product instructions are used. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased through regular channels.

[0043] This embodiment relates to a soft label imaging material with high color density and high uniformity, and the soft label imaging material comprises a back coating layer, a substrate, a primer layer and a dye layer ( Figure 1 );

[0044] The back coating layer comprises the following components: a back coating layer resin, a lubricant, and a first solid filler; the lubricant accounts for 10%-40% of the weight of the back coating layer resin; the first solid filler accounts for 1%-5% of the weight of the back coating layer resin;

[0045] The base coating layer comprises the following components: a base coating layer resin;

[0046] The dye layer comprises the following components: an adhesive resin, a dye, a solid lubricant, and a second solid filler; the weight ratio of the dye to the adhesive resin is in the range of 1:1-2:1; the solid lubricant accounts for 0.3%-5% of the total amount of the adhesive resin and the dye; and the second solid filler accounts for 0.2%-0.4% of the total amount of the adhesive resin and the dye.

[0047] In this embodiment, the substrate preferably includes a polyethylene terephthalate film; the substrate is usually a commonly known material on the market with a certain degree of heat resistance and strength. The thickness of the substrate is 4μm-125μm, and the component of the substrate is a PET film. Preferably, the thickness of the PET film substrate is 4.3μm-12.5μm; generally speaking, the substrate needs to be surface treated before the coating is directly applied on the substrate. Considering the cost, corona discharge treatment is generally used to make the dyne value of the substrate surface greater than 38.

[0048] In this embodiment, the back coating resin includes at least one of polyvinyl butyral (PVB) resin, cellulose resin, silicone-modified polyurethane, and polyamide resin; the lubricant includes at least one of metal soap, phosphate ester, silicone oil (such as silicone oil), and mold release agent; the first solid filler includes at least one of gas silica, talcum powder, and kaolin. The back coating resin includes polyvinyl butyral (PVB) resin and cellulose resin; the molecular weight of the polyvinyl butyral is 50000-60000, and the degree of polymerization is 300-1300; the particle size of the first solid filler is 300nm-5μm.

[0049] The main function of the back coating is to adapt to the high-speed printing of the thermal sublimation printer, improve the heat resistance and lubricity of the substrate, prevent adhesion and printing wrinkles caused by the heat of the thermal head during printing, and ensure the heat transfer of the print head without melting the substrate under high-heat printing conditions. Generally, the optional resins are PVB resin, cellulose resin, silicone-modified polyurethane, polyamide resin, etc. The preferred resin is high acetal, high TG PVB resin, the molecular weight is preferably 50000-60000, and the degree of polymerization is preferably 300-1300.

[0050] Furthermore, in order to improve the lubricity of the back coating and reduce friction damage to the print head during printing, a certain amount of solid and liquid lubricants, such as metal soaps, phosphate esters, silicone oils, release agents, etc., can be added to the back coating. The amount added is 10%-40% of the weight of the back coating resin, and preferably 20%-30%.

[0051] In order to solve the problem of material accumulation on the print head and further improve the lubricity of the back coating, a certain amount of solid fillers such as gas silica, talcum powder, kaolin, etc. can be added to the back coating, with a particle size of 300nm-5μm, preferably 1-4μm, and an addition amount of 1%-5% of the weight of the back coating resin, preferably 3%-5%. Too large a particle size will affect the surface smoothness of the coating, and too small a particle size will not reduce the friction between the print head and the back coating.

[0052] In order to improve the uniformity of ribbon printing, the back coating material needs to be ground. Grinding the back coating can improve the distribution uniformity of solid lubricants and solid particulate materials in the back coating, as well as the uniformity of the particle size of the particulate materials. Within a certain range, as the grinding time increases, the uniformity of the printed light color levels will gradually improve, reducing the uneven color distribution and whitening; after grinding for a certain period of time, its uniformity will no longer change. It is recommended to add zirconium beads with a particle size of 0.6mm, a grinding speed of 1500r / min, and an air pump pressure of 0.1Mpa-0.3Mpa during grinding. Stirring is required during grinding to avoid uneven system or sinking to the bottom. The recommended grinding time is 30-120min, preferably 40-60min.

[0053] In order to increase the color density of ribbon printing, the coating thickness of the back coating can be reduced within a certain range. The color density gradually increases with the reduction of coating thickness, but the heat resistance during ribbon printing needs to be considered. The recommended coating thickness of the back coating is 0.2μm-1μm, and the preferred thickness is 0.4μm-0.6μm.

[0054] In this embodiment, the primer resin includes at least one of polyvinyl pyrrolidone, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, and methyl cellulose.

[0055] The main function of the primer layer is to improve the adhesion and dispersibility of the dye on the substrate, thereby improving the uniformity of the printed image and the vividness of the color. When heated during the printing process, the dye will diffuse in two opposite directions of the substrate and the adhesive layer at the same time. Therefore, the primer layer preferably selects a resin or sol that satisfies both poor dye adsorption and excellent adhesion to the substrate. For cost and coating considerations, it is preferred to use one or more of polyvinyl pyrrolidone, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, methyl cellulose, etc. The primer solvent is mainly isopropanol, with a content of 90%-98% of the total mass, and the content of the resin is 2%-10% of the total mass, preferably 3%-6%. The thickness is 0.1μm-0.5μm, and the preferred thickness is 0.1μm-0.3μm. If the coating thickness is too low or too high, there is a risk of printing discoloration.

[0056] In this embodiment, the dye layers are preferably yellow dye layer, magenta dye layer and cyan dye layer from left to right. The adhesive resin includes at least one of polyvinyl pyrrolidone, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, methyl cellulose, polyurethane, polycarbonate and polyester resin; the magenta dye layer includes magenta dye (solvent red 24); the yellow dye layer includes yellow dye (solvent yellow 2); the cyan dye layer includes cyan dye (solvent blue 36); the weight ratio of the magenta dye to the adhesive resin is 1.8:1-1.5:1, the weight ratio of the yellow dye to the adhesive resin is 1.4:1-1.2:1, and the weight ratio of the cyan dye to the adhesive resin is 2:1-1.8:1; the solid lubricant includes a solid lubricant with a melting point of 60°C-70°C; the second solid filler includes polymethyl methacrylate (PMMA). The solid lubricant includes at least one of pentaerythritol stearate, octadecyl erucamide and erucamide.

[0057] The function of the dye layer is mainly to provide dyes for true color printing. There is no special restriction on the dye, and it can be selected from a variety of sublimation dyes, preferably dyes with low melting and sublimation temperatures and good solubility. As a binder for the above-mentioned dye, the main resin of the dye layer preferably uses one or more of polyvinyl pyrrolidone, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, methyl cellulose, polyurethane, polycarbonate, polyester resin, etc. Increasing the amount of resin added can increase the viscosity of the dye layer, thereby achieving better coating uniformity, but it will also hinder the sublimation of the dye during printing and reduce the printing color density; reducing the amount of resin added can increase the printing color density, but if the amount added is too low, there will be problems such as uneven coating film surface and easy migration of dyes. Therefore, the amount added is 2%-15% of the total mass, and the preferred amount added is 2%-5%.

[0058] The coating uniformity of the dye layer can affect the printing uniformity of the ribbon to a certain extent. The solvent is a mixed solvent of butanone and toluene. The viscosity of the dye layer can be increased by increasing the amount of toluene in the solvent, thereby achieving better coating uniformity. The amount of solvent added is 80%-95% of the total mass, preferably 5%-10%; the ratio of butanone to toluene is preferably 1:1-1:3.

[0059] This ribbon is provided with three dyes: yellow, magenta and cyan. The ratio of dye to resin in its formula can be adjusted according to the solubility of different color dyes and the color density required. Within a certain ratio range, when the total amount of resin and dye remains unchanged, increasing the proportion of dye and reducing the proportion of resin can greatly improve the color density of the ribbon. However, when the ratio of dye to resin reaches a certain value, the effect of improving color density gradually decreases. Due to the low solubility of the dye, this method can obtain a more uniform coating film surface and printing film surface compared to directly increasing the amount of dye added in the dye layer, and at the same time, its color density improvement efficiency is also higher; compared with increasing the thickness of the dye layer, this scheme has a higher heat transfer efficiency, thereby improving the utilization rate of the dye and achieving the effect of reducing costs. The weight ratio of dye to resin ranges from 1:1 to 2:1. If the amount of resin added is too high, the migration efficiency of the dye during printing will be reduced, and if the amount of resin added is too low, its fixing effect on the dye will be weakened, resulting in the problem that the dye is easy to migrate to the surface of the ribbon at room temperature, that is, the floating color phenomenon. Different colors have different requirements for color density. The preferred weight ratio of dye to resin is 1.4:1-1.2:1 for yellow, 1.8:1-1.5:1 for magenta, and 2:1-1.8:1 for cyan.

[0060] In order to make the ribbon adapt to the high heat and high pressure required for printing, reduce the transfer of liquid lubricant on the substrate to the ribbon, and avoid the situation where the ribbon and the substrate are bonded during printing, it is necessary to increase the smoothness of the dye layer. A certain amount of solid lubricant can be added to the dye layer to improve the smoothness of the ribbon surface. Considering that the dye layer will be in direct contact with the back coating when the ribbon is rolled up, in order to make the carbon ribbon still maintain good printing quality after passing through a high temperature and high humidity environment, a solid lubricant with a higher melting point is preferred to reduce the migration of the dye and lubricant to the back coating. The preferred solid lubricant is a solid lubricant with a melting point of about 60°C-70°C, such as pentaerythritol stearate, octadecyl erucamide, erucamide, etc., which provides smoothness and reduces dye migration. At the same time, its melting point range has a certain effect on improving the color density of the low color level of the ribbon, and can assist the dye to diffuse and distribute more evenly to the surface of the substrate during the printing heating process. The amount of solid lubricant added is 0.3%-5% of the total amount of resin and dye, and the preferred amount is 1%-3%.

[0061] In order to further ensure that the carbon ribbon can still maintain good printing quality after being subjected to a high temperature and high humidity environment, and to prevent the dye layer from bonding with the back coating layer, a certain amount of solid filler can be added to the dye layer. The preferred filler is polymethyl methacrylate (PMMA), which has the advantages of high mechanical strength, good light transmittance, and low cost. The preferred amount of addition is 0.2%-0.4% of the total amount of resin and dye. The amount of addition needs to be well controlled. If too much is added, the color density and uniformity of light-level printing will be reduced. If too little is added, the back coating layer may bond with the dye layer.

[0062] The recommended coating thickness of the dye layer is 0.3μm-1.0μm. On the basis of achieving the required color density, the coating thickness of the dye layer should be reduced as much as possible to obtain a better heat transfer effect, thereby increasing the migration rate of the dye to the printing layer, so that the utilization rate of the dye in the formula is improved, and finally the purpose of reducing the required cost is achieved. The preferred thickness for different colors is 0.6μm-0.8μm for cyan, 0.4μm-0.6μm for magenta, and 0.3μm-0.5μm for yellow.

[0063] This embodiment also relates to a method for preparing a soft label imaging material with high color density and high uniformity, comprising the following steps:

[0064] (1) preparing a back coating coating liquid by mixing the components of the back coating layer with a first solvent;

[0065] The components of the base coating layer are formulated with a second solvent to form a base coating liquid;

[0066] The components of the dye layer are mixed with a third solvent to form a dye layer coating liquid, wherein the dye layer coating liquid includes a magenta dye layer coating liquid, a yellow dye layer coating liquid and a cyan dye layer coating liquid;

[0067] (2) grinding the back coating layer coating liquid, and then coating it on one side of the substrate by a gravure coater, and then grinding it after drying to obtain a back coating layer;

[0068] Applying the primer coating liquid on the other side of the substrate by a gravure coater, and drying to obtain a primer coating;

[0069] The yellow dye layer coating liquid, the magenta dye layer coating liquid and the cyan dye layer coating liquid are sequentially coated on the undercoat layer by a gravure coater and dried to obtain dye layers.

[0070] This embodiment improves the flatness of the back coating of the ribbon by grinding, so that the heat transfer uniformity of the ribbon during printing is improved, thereby improving the uniformity of printed images and texts.

[0071] In this embodiment, the first solvent includes a first butanone-toluene mixed solvent, wherein the volume ratio of butanone to toluene in the first butanone-toluene mixed solvent is 3:1-2:1; the first solvent accounts for 80%-90% of the weight of the back coating liquid;

[0072] The second solvent includes isopropyl alcohol; the second solvent accounts for 90%-98% by weight of the primer coating solution;

[0073] The third solvent comprises a second butanone-toluene mixed solvent, wherein the volume ratio of butanone to toluene in the second butanone-toluene mixed solvent is 1:1-1:3; the third solvent accounts for 80%-95% of the weight of the dye layer coating liquid.

[0074] In this embodiment, the uniformity of the coating film surface is improved by adjusting the proportion of the third solvent.

[0075] In this embodiment, the back coating liquid is preferably coated on one side of the substrate by a gravure coater to a coating thickness of 0.2 μm to 1 μm;

[0076] The grinding parameters are as follows: grinding speed 1200r / min-1800r / min, air pump pressure 0.1Mpa-0.3Mpa, time 30min-120min;

[0077] The primer coating liquid is coated on the other side of the substrate by a gravure coater to a coating thickness of 0.1 μm to 0.5 μm;

[0078] The yellow dye layer coating solution, the magenta dye layer coating solution and the cyan dye layer coating solution are sequentially coated on the undercoat layer by a gravure coater to a coating thickness of 0.3 μm-0.5 μm, 0.4 μm-0.6 μm and 0.6 μm-0.8 μm, respectively.

[0079] The following is a detailed description with specific implementation methods; unless otherwise specified, the parts in the following implementation methods all represent mass fractions.

[0080] Embodiment 1:

[0081] This embodiment relates to a soft label imaging material with high color density and high uniformity, and the soft label imaging material comprises a back coating layer, a substrate, a primer layer and a dye layer from top to bottom;

[0082] The substrate uses a PET film with a thickness of 4.3μm, and the manufacturer is Anhui Tongai.

[0083] The primer layer includes the following components in parts by weight:

[0084] 2 parts of polyvinyl pyrrolidone (industrial grade PVP K90 Guangdong Yuemei Chemical Industry);

[0085] Polyvinyl alcohol (Tianjin Damao Chemical) 2 parts;

[0086] 96 parts of isopropyl alcohol;

[0087] The coating was performed using a gravure coater, and the coating thickness was 0.2 μm.

[0088] The dye layer includes a magenta dye layer, a yellow dye layer and a cyan dye layer;

[0089] Wherein, the yellow dye layer comprises the following components in parts by weight:

[0090] Polyurethane (901H Wanhua Chemical) 3 parts;

[0091] Solvent Yellow 2 (Henan Wokas Biotechnology) 3.6 parts;

[0092] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts;

[0093] Octadecyl erucamide (DY1558 Jiangxi Dongyuan) 0.13 parts;

[0094] 2-butanone 46.62 parts;

[0095] 3-toluene 46.62 parts;

[0096] The coating was performed using a gravure coater, and the coating thickness was 0.4 μm.

[0097] The magenta dye layer includes the following components in parts by weight:

[0098] Polyurethane (901H Wanhua Chemical) 3.2 parts;

[0099] Solvent Red 24 (Sinopharm Chemical Reagent) 4.8 parts;

[0100] Polymethyl methacrylate (CM 205, Taiwan Chimei) 0.03 parts; octadecyl erucamide (DY1558, Jiangxi Dongyuan) 0.13 parts; 2-butanone 45.92 parts;

[0101] Toluene 45.92 parts.

[0102] The coating was performed using a gravure coater, and the coating thickness was 0.6 μm.

[0103] The cyan dye layer includes the following components in parts by weight:

[0104] Polyurethane (901H Wanhua Chemical) 2.85 parts;

[0105] Solvent Blue 36 (Nanjing Kangmanlin Chemical Industry) 5.13 parts;

[0106] 0.03 parts of polymethyl methacrylate (CM 205, Chimei, Taiwan); 0.13 parts of octadecyl erucamide (DY1558, Dongyuan, Jiangxi); 45.93 parts of 2-butanone;

[0107] Toluene 45.93 parts;

[0108] The coating was performed using a gravure coater, and the coating thickness was 0.8 μm.

[0109] The back coating layer includes the following components in parts by weight:

[0110] 3 parts of polyvinyl butyral (B265H-B Guangzhou Hongshang);

[0111] Cellulose acetate butyrate (CAB393-3 American Eastman) 7 parts; Isocyanate ( MDI-50 Wanhua Chemical) 2.5 parts; talcum powder (LJ-320 Liangjiang Chemical) 0.5 parts;

[0112] 0.2 parts of silicone oil (KF-6001 Shin-Etsu silicone); 57.8 parts of 2-butanone;

[0113] Toluene 29 parts.

[0114] The film was ground with a sander for 20 minutes and coated with a gravure coater with a coating thickness of 0.5 μm.

[0115] Embodiment 2:

[0116] This embodiment relates to a soft label imaging material with high color density and high uniformity, and the soft label imaging material comprises a back coating layer, a substrate, a primer layer and a dye layer from top to bottom;

[0117] The substrate, the primer layer, and the dye layer are consistent with those in Example 1, the back coating formulation is consistent with that in Example 1, and the grinding time is 40 min.

[0118] Embodiment 3:

[0119] This embodiment relates to a soft label imaging material with high color density and high uniformity, and the soft label imaging material comprises a back coating layer, a substrate, a primer layer and a dye layer from top to bottom;

[0120] The substrate, the primer layer, and the dye layer are consistent with those in Example 1, the back coating formulation is consistent with that in Example 1, and the grinding time is 60 min.

[0121] Embodiment 4:

[0122] This embodiment relates to a soft label imaging material with high color density and high uniformity, and the soft label imaging material comprises a back coating layer, a substrate, a primer layer and a dye layer from top to bottom;

[0123] The substrate, the base coating, and the back coating are consistent with those in Example 2, and the dye layer formula is as follows:

[0124] The dye layer includes a magenta dye layer, a yellow dye layer and a cyan dye layer;

[0125] Wherein, yellow comprises the following components by weight:

[0126] Polyurethane (901H Wanhua Chemical) 2.87 parts;

[0127] Solvent Yellow 2 (Henan Wokas Biotechnology) 3.73 parts;

[0128] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts;

[0129] Octadecyl erucamide (DY1558 Jiangxi Dongyuan) 0.13 parts;

[0130] 2-butanone 46.62 parts;

[0131] Toluene 46.62 parts;

[0132] The coating was performed using a gravure coater, and the coating thickness was 0.4 μm.

[0133] Magenta includes the following components in parts by weight:

[0134] Polyurethane (901H Wanhua Chemical) 3.08 parts;

[0135] Solvent Red 24 (Sinopharm Chemical Reagent) 4.92 parts;

[0136] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts;

[0137] Octadecyl erucamide (DY1558 Jiangxi Dongyuan) 0.13 parts;

[0138] 2-butanone 45.92 parts;

[0139] Toluene 45.92 parts;

[0140] The coating was performed using a gravure coater, and the coating thickness was 0.6 μm.

[0141] Cyan includes the following components in parts by weight:

[0142] Polyurethane (901H Wanhua Chemical) 2.76 parts;

[0143] Solvent Blue 36 (Nanjing Kangmanlin Chemical Industry) 5.24 parts;

[0144] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts;

[0145] Octadecyl erucamide (DY1558 Jiangxi Dongyuan) 0.13 parts;

[0146] 2-butanone 45.93 parts;

[0147] Toluene 45.93 parts;

[0148] The coating was performed using a gravure coater, and the coating thickness was 0.8 μm.

[0149] Embodiment 5:

[0150] This embodiment relates to a soft label imaging material with high color density and high uniformity, and the soft label imaging material comprises a back coating layer, a substrate, a primer layer and a dye layer from top to bottom;

[0151] The substrate, the primer layer, and the back coating layer are the same as those in Example 2, except for the dye layer.

[0152] Yellow includes the following components by weight:

[0153] Polyurethane (901H Wanhua Chemical) 2.75 parts;

[0154] Solvent Yellow 2 (Henan Wokas Biotechnology) 3.85 parts;

[0155] 0.03 parts of polymethyl methacrylate (CM 205, Chimei, Taiwan); 0.13 parts of octadecyl erucamide (DY1558, Dongyuan, Jiangxi); 46.62 parts of 2-butanone;

[0156] Toluene 46.62 parts;

[0157] The coating was carried out using a gravure coater with a coating thickness of 0.4 μm. Magenta includes the following components in parts by weight:

[0158] Polyurethane (901H Wanhua Chemical) 2.86 parts;

[0159] Solvent Red 24 (Sinopharm Chemical Reagent) 5.14 parts;

[0160] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts; Octadecyl erucamide (DY1558, Dongyuan, Jiangxi) 0.13 parts; 2-butanone 45.92 parts;

[0161] Toluene 45.92 parts;

[0162] The coating was carried out using a gravure coater with a coating thickness of 0.6 μm. The cyan color includes the following components in parts by weight:

[0163] Polyurethane (901H Wanhua Chemical) 2.67 parts;

[0164] Solvent Blue 36 (Nanjing Kangmanlin Chemical Industry) 5.33 parts;

[0165] 0.03 parts of polymethyl methacrylate (CM 205, Taiwan Chimei); 0.13 parts of octadecyl erucamide (DY1558, Jiangxi Dongyuan); 45.93 parts of 2-butanone;

[0166] Toluene 45.93 parts;

[0167] The coating was performed using a gravure coater, and the coating thickness was 0.8 μm.

[0168] Embodiment 6:

[0169] This embodiment relates to a soft label imaging material with high color density and high uniformity, and the soft label imaging material comprises a back coating layer, a substrate, a primer layer and a dye layer from top to bottom;

[0170] The substrate, the primer layer, and the back coating layer are the same as those in Example 2, except for the dye layer.

[0171] Yellow includes the following components by weight:

[0172] Polyurethane (901H Wanhua Chemical) 3 parts;

[0173] Solvent Yellow 2 (Henan Wokas Biotechnology) 3.6 parts;

[0174] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts;

[0175] 2-butanone 46.68 parts;

[0176] Toluene 46.68 parts;

[0177] The coating was performed using a gravure coater, and the coating thickness was 0.4 μm.

[0178] Magenta includes the following components in parts by weight:

[0179] Polyurethane (901H Wanhua Chemical) 3.2 parts;

[0180] Solvent Red 24 (Sinopharm Chemical Reagent) 4.8 parts;

[0181] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts;

[0182] 2-butanone 45.98 parts;

[0183] Toluene 45.98 parts

[0184] The coating was performed using a gravure coater, and the coating thickness was 0.6 μm.

[0185] Cyan includes the following components in parts by weight:

[0186] Polyurethane (901H Wanhua Chemical) 2.85 parts;

[0187] Solvent Blue 36 (Nanjing Kangmanlin Chemical Industry) 5.13 parts;

[0188] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts;

[0189] 2-butanone 46 parts;

[0190] Toluene 46 parts;

[0191] The coating was performed using a gravure coater, and the coating thickness was 0.8 μm.

[0192] Embodiment 7:

[0193] This embodiment relates to a soft label imaging material with high color density and high uniformity, and the soft label imaging material comprises a back coating layer, a substrate, a primer layer and a dye layer from top to bottom;

[0194] The substrate, the primer layer, and the back coating layer are the same as those in Example 2, except for the dye layer.

[0195] Yellow includes the following components by weight:

[0196] Polyurethane (901H Wanhua Chemical) 3 parts;

[0197] Solvent Yellow 2 (Henan Wokas Biotechnology) 3.6 parts;

[0198] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts;

[0199] Octadecyl erucamide (DY1558 Jiangxi Dongyuan) 0.13 parts;

[0200] 2-butanone 31.08 parts;

[0201] Toluene 62.16 parts;

[0202] The coating was performed using a gravure coater, and the coating thickness was 0.4 μm.

[0203] Magenta includes the following components in parts by weight:

[0204] Polyurethane (901H Wanhua Chemical) 3.2 parts;

[0205] Solvent Red 24 (Sinopharm Chemical Reagent) 4.8 parts;

[0206] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts;

[0207] Octadecyl erucamide (DY1558 Jiangxi Dongyuan) 0.13 parts;

[0208] 2-butanone 30.61 parts;

[0209] Toluene 61.23 parts;

[0210] The coating was performed using a gravure coater, and the coating thickness was 0.6 μm.

[0211] Cyan includes the following components in parts by weight:

[0212] Polyurethane (901H Wanhua Chemical) 2.85 parts;

[0213] Solvent Blue 36 (Nanjing Kangmanlin Chemical Industry) 5.13 parts;

[0214] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts;

[0215] Octadecyl erucamide (DY1558 Jiangxi Dongyuan) 0.13 parts

[0216] 2-butanone 30.62 parts;

[0217] Toluene 61.24 parts;

[0218] The coating was performed using a gravure coater, and the coating thickness was 0.8 μm.

[0219] Comparative Example 1:

[0220] This comparative example relates to a soft label imaging material with high color density and high uniformity, wherein the soft label imaging material comprises a back coating layer, a substrate, a primer layer and a dye layer in order from top to bottom;

[0221] The substrate and the base coating are the same as those in Example 1, but the dye layer is different.

[0222] Yellow includes the following components by weight:

[0223] Polyurethane (901H Wanhua Chemical) 3.3 parts;

[0224] Solvent Yellow 2 (Henan Wokas Biotechnology) 3.3 parts;

[0225] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts;

[0226] Octadecyl erucamide (DY1558 Jiangxi Dongyuan) 0.13 parts;

[0227] 2-butanone 46.62 parts;

[0228] Toluene 46.62 parts;

[0229] The coating was performed using a gravure coater, and the coating thickness was 0.4 μm.

[0230] Magenta includes the following components in parts by weight:

[0231] Polyurethane (901H Wanhua Chemical) 4 parts;

[0232] Solvent Red 24 (Sinopharm Chemical Reagent) 4 parts;

[0233] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts;

[0234] Octadecyl erucamide (DY1558 Jiangxi Dongyuan) 0.13 parts;

[0235] 2-butanone 45.92 parts;

[0236] Toluene 45.92 parts;

[0237] The coating was performed using a gravure coater, and the coating thickness was 0.6 μm.

[0238] Cyan includes the following components in parts by weight:

[0239] Polyurethane (901H Wanhua Chemical) 4 parts;

[0240] 4 parts of solvent blue 36 (Nanjing Kangmanlin Chemical Industry);

[0241] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts;

[0242] Octadecyl erucamide (DY1558 Jiangxi Dongyuan) 0.13 parts;

[0243] 2-butanone 45.93 parts;

[0244] Toluene 45.93 parts;

[0245] The coating was performed using a gravure coater, and the coating thickness was 0.8 μm.

[0246] The formulation of the back coating was consistent with that of Example 1, but no grinding was performed.

[0247] Comparative Example 2:

[0248] This comparative example relates to a soft label imaging material with high color density and high uniformity, wherein the soft label imaging material comprises a back coating layer, a substrate, a primer layer and a dye layer in order from top to bottom;

[0249] The substrate, the primer layer, and the back coating layer are consistent with those in Comparative Example 1, and the dye layer is consistent with that in Example 1.

[0250] Comparative Example 3:

[0251] This comparative example relates to a soft label imaging material with high color density and high uniformity, wherein the soft label imaging material comprises a back coating layer, a substrate, a primer layer and a dye layer in order from top to bottom;

[0252] The substrate, the primer layer, and the back coating layer are consistent with those in Example 2, and the dye layer is consistent with that in Comparative Example 1.

[0253] Comparative Example 4:

[0254] This comparative example relates to a soft label imaging material with high color density and high uniformity, wherein the soft label imaging material comprises a back coating layer, a substrate, a primer layer and a dye layer in order from top to bottom;

[0255] The substrate, the primer layer, and the back coating layer are the same as those in Example 2, except for the dye layer.

[0256] Yellow includes the following components by weight:

[0257] Polyurethane (901H Wanhua Chemical) 3.3 parts;

[0258] 5 parts of solvent yellow 2 (Henan Wokas Biotechnology);

[0259] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts;

[0260] Octadecyl erucamide (DY1558 Jiangxi Dongyuan) 0.13 parts;

[0261] 2-butanone 46.62 parts;

[0262] Toluene 46.62 parts;

[0263] The coating was performed using a gravure coater, and the coating thickness was 0.4 μm.

[0264] Magenta includes the following components in parts by weight:

[0265] Polyurethane (901H Wanhua Chemical) 4 parts;

[0266] Solvent Red 24 (Sinopharm Chemical Reagent) 7 parts;

[0267] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts;

[0268] Octadecyl erucamide (DY1558 Jiangxi Dongyuan) 0.13 parts;

[0269] 2-butanone 45.92 parts;

[0270] Toluene 45.92 parts;

[0271] The coating was performed using a gravure coater, and the coating thickness was 0.6 μm.

[0272] Cyan includes the following components in parts by weight:

[0273] Polyurethane (901H Wanhua Chemical) 4 parts;

[0274] Solvent Blue 36 (Nanjing Kangmanlin Chemical Industry) 7 parts;

[0275] Polymethyl methacrylate (CM 205, Chimei, Taiwan) 0.03 parts;

[0276] Octadecyl erucamide (DY1558 Jiangxi Dongyuan) 0.13 parts;

[0277] 2-butanone 45.93 parts;

[0278] Toluene 45.93 parts;

[0279] The coating was performed using a gravure coater, and the coating thickness was 0.8 μm.

[0280] Test example

[0281] (1) Color density test

[0282] Color density test: Use DTP330 for printing, and set STB values ​​to Y185, M200, C200, and OC100. Use X-Rite i1 PRO3 colorimeter to test the color density of the 16-color scale chart of the printed product covered with OC, and select 1, 9, and 16 levels of data for recording.

[0283] (2) Uniformity test

[0284] Uniformity test: Use DTP330 for printing, and set STB values ​​to Y185, M200, C200, and OC100. Observe the 16-color scale chart of the printed product covered with OC with a magnifying glass, and observe from which color scale the color block has no obvious mottled or leaking white phenomenon; and divide its overall uniformity into three levels: A, B, and C, where A means that the overall uniformity of all color scales is good; B means that the uniformity of medium and high color scales is good, and the uniformity of light color scales is poor; C means that the overall uniformity of all color scales is poor.

[0285] Table 1 Color density test results

[0286]

[0287] Table 2 Uniformity test results

[0288]

[0289]

[0290] In summary, the present invention provides a thermal sublimation ribbon for soft label printing, which improves the flatness of the ribbon back coating layer by grinding, thereby improving the heat transfer uniformity when the ribbon is printed, thereby improving the uniformity of the printed image and text; by increasing the relative content of the dye contrast resin, the color density is improved without affecting the printing uniformity of the ribbon; by adjusting the solvent ratio of the dye layer, the uniformity of the coating film surface is improved; by adding a solid lubricant to the dye layer, the uniformity of the light color scale of the printed image and text is improved; so that the thermal sublimation ribbon has the characteristics of high color density and high uniformity in the application of soft label printing.

[0291] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A soft label imaging material with high color density and high uniformity, characterized in that: The soft label imaging material comprises a back coating layer, a substrate, a primer layer and a dye layer in order from top to bottom; The back coating layer comprises the following components: a back coating layer resin, a lubricant, and a first solid filler; the lubricant accounts for 10%-40% of the weight of the back coating layer resin; the first solid filler accounts for 1%-5% of the weight of the back coating layer resin; The base coating layer comprises the following components: a base coating layer resin; The dye layer comprises the following components: an adhesive resin, a dye, a solid lubricant, and a second solid filler; the weight ratio of the dye to the adhesive resin is in the range of 1:1-2:1; the solid lubricant accounts for 0.3%-5% of the total amount of the adhesive resin and the dye; and the second solid filler accounts for 0.2%-0.4% of the total amount of the adhesive resin and the dye.

2. The soft label imaging material with high color density and high uniformity according to claim 1, characterized in that: The back coating resin includes at least one of polyvinyl butyral resin, cellulose resin, silicone-modified polyurethane, and polyamide resin; The lubricant includes at least one of metal soap, phosphate ester, silicone oil and a release agent; The first solid filler includes at least one of silica, talc and kaolin.

3. The soft label imaging material with high color density and high uniformity according to claim 1, characterized in that: The back coating resin includes polyvinyl butyral resin and cellulose resin; the molecular weight of the polyvinyl butyral is 50000-60000, and the degree of polymerization is 300-1300; The particle size of the first solid filler is 300 nm-5 μm.

4. The soft label imaging material with high color density and high uniformity according to claim 1, characterized in that: The primer resin includes at least one of polyvinyl pyrrolidone, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, and methyl cellulose.

5. The soft label imaging material with high color density and high uniformity according to any one of claims 1 to 4, characterized in that: The dye layers are, from left to right, a yellow dye layer, a magenta dye layer, and a cyan dye layer.

6. The soft label imaging material with high color density and high uniformity according to claim 5, characterized in that: The adhesive resin includes at least one of polyvinyl pyrrolidone, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, methyl cellulose, polyurethane, polycarbonate, and polyester resin; The magenta dye layer includes a magenta dye; the yellow dye layer includes a yellow dye; the cyan dye layer includes a cyan dye; the weight ratio of the magenta dye to the binding resin is 1.8:1-1.5:1, the weight ratio of the yellow dye to the binding resin is 1.4:1-1.2:1, and the weight ratio of the cyan dye to the binding resin is 2:1-1.8:1; The solid lubricant includes a solid lubricant with a melting point of 60° C.-70° C.; the second solid filler includes polymethyl methacrylate.

7. The soft label imaging material with high color density and high uniformity according to claim 6, characterized in that: The solid lubricant includes at least one of pentaerythritol stearate, octadecyl erucamide, and erucamide.

8. A method for preparing a soft label imaging material with high color density and high uniformity according to any one of claims 1 to 7, characterized in that: The steps include: (1) preparing a back coating coating solution by mixing the components of the back coating layer with a first solvent; The components of the base coat layer are formulated with a second solvent to form a base coat coating solution; The components of the dye layer are mixed with a third solvent to form a dye layer coating liquid, wherein the dye layer coating liquid includes a magenta dye layer coating liquid, a yellow dye layer coating liquid and a cyan dye layer coating liquid; (2) grinding the back coating liquid, coating it on one side of the substrate by a gravure coater, and drying it to obtain a back coating; Applying the primer coating liquid on the other side of the substrate by a gravure coater, and drying to obtain a primer coating; The yellow dye layer coating liquid, the magenta dye layer coating liquid and the cyan dye layer coating liquid are sequentially coated on the undercoat layer by a gravure coater and dried to obtain dye layers.

9. The method for preparing a soft label imaging material with high color density and high uniformity according to claim 8, characterized in that: The first solvent comprises a first butanone-toluene mixed solvent, wherein the mass ratio of butanone to toluene in the first butanone-toluene mixed solvent is 3:1-2:1; the first solvent accounts for 80%-90% of the weight of the back coating liquid; The second solvent includes isopropyl alcohol; the second solvent accounts for 90%-98% by weight of the primer coating solution; The third solvent comprises a second butanone-toluene mixed solvent, wherein the mass ratio of butanone to toluene in the second butanone-toluene mixed solvent is 1:1-1:3; the third solvent accounts for 80%-95% of the weight of the dye layer coating liquid.

10. The method for preparing a soft label imaging material with high color density and high uniformity according to claim 8, characterized in that: The back coating liquid is coated on one side of the substrate by a gravure coater to a coating thickness of 0.2 μm to 1 μm; The grinding parameters are as follows: grinding speed 1200r / min-1800r / min, air pump pressure 0.1Mpa-0.3Mpa, time 30min-120min; The primer coating liquid is coated on the other side of the substrate by a gravure coater, and the coating thickness is 0.1 μm-0.5 μm; The yellow dye layer coating liquid, the magenta dye layer coating liquid and the cyan dye layer coating liquid are sequentially coated on the base coating layer by a gravure coater, and the coating thicknesses are 0.3 μm-0.5 μm, 0.4 μm-0.6 μm and 0.6 μm-0.8 μm, respectively.

Images