Thermal transfer printing material for line size sticker label and preparation process thereof

Abstract

The invention relates to the technical field of line number sticker labels, in particular to a heat transfer printing material for a line number sticker label and a preparation process of the heat transfer printing material. The heat transfer printing material for the line number sticker label comprises a heat insulation layer, a base material, a transfer printing layer and a color developing layer, the heat insulation layer is coated on the back face of the base material, the transfer printing layer is coated on the front face of the base material, and the color developing layer is coated on the transfer printing layer; the heat insulation layer is prepared from the following raw materials in percentage by weight: 90 to 95 weight percent of solvent, 2 to 7 weight percent of organic silicon resin and 3 to 8 weight percent of high-adhesion resin, and the transfer printing layer is prepared from the following raw materials in percentage by weight: 70 to 80 weight percent of solvent, 2 to 6 weight percent of ethylene-vinyl acetate copolymer and 16 to 27 weight percent of wax powder. According to the present invention, the characteristics of good durability, good heat resistance, good alcohol resistance, good friction resistance, wide applicability, rich color and the like can be provided in the application aspect of the sticker label, and the sticker label can be more suitable for use under severe conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of line number sticker labels, and in particular to a thermal transfer material for line number sticker labels and a preparation process thereof. Background Art

[0002] Line number sticker labels are a commonly used identification tool, mainly used to mark cables, equipment ports, etc. Existing line number sticker label transfer materials are subject to some restrictions in terms of applicable substrates and applicable models, such as poor transfer effects on certain special material surfaces (such as certain coatings, smooth surfaces, etc.), low versatility, relatively poor durability of transfer labels, and are easily affected by wear, scratches, and chemical erosion. The use conditions are affected by the environment and have a narrow scope of application.

[0003] Therefore, technical personnel in this field urgently need to develop a new thermal transfer material for line number sticker labels and its preparation process, so that it has good durability, heat resistance, alcohol resistance and friction resistance, wide applicability, rich colors and other characteristics in sticker label applications, providing a reliable and efficient solution for product identification. Summary of the invention

[0004] In view of the problems of the prior art, the purpose of the present invention is to provide a thermal transfer material for line number sticker labels and a preparation process thereof, and to strive to improve the alcohol resistance and friction resistance of the thermal transfer material for line number sticker labels during use, so that it can be more suitable for use under harsh conditions, and has good durability, heat resistance, rich colors, wide applicability and other characteristics in sticker label applications, providing a reliable and efficient solution for product identification.

[0005] To achieve the above object, the present invention is implemented according to the following technical solutions:

[0006] A thermal transfer material for a line number sticker label, comprising a heat insulating layer, a substrate, a transfer layer and a color developing layer;

[0007] The main function of the thermal insulation layer is to improve the smoothness of the thermal transfer material for the line number sticker label when it passes through the machine for printing, reduce the generation of static electricity, enhance its heat resistance to ensure the integrity of the film, and protect the machine print head. The raw materials of the thermal insulation layer include 90-95wt% solvent, 2-7wt% silicone resin and 3-8wt% high-bonding resin. The high-bonding resin is polyester resin or polyurethane, which has excellent bonding force and wear resistance. The silicone content in the silicone resin is more than 50% (the introduction of silicon groups increases its inherent anti-friction performance and high temperature resistance), and because of its modified polymerization, it contains acryl groups with excellent affinity, has excellent sliding characteristics, and can also effectively prevent vibration sounds and creaking noises.

[0008] The substrate is one of polyethylene terephthalate (PET) film, 1,4-polycyclohexylene dimethylene terephthalate film, polyethylene naphthalate (PEN) film, polyphenylene sulfide film, polystyrene (PS) film, polypropylene (PP) film, polyethylene (PE) film, polyvinyl chloride film, nylon film, and polyimide film;

[0009] The transfer layer mainly appears as a protective layer, a wear-resistant layer and a peeling layer. The transfer layer includes the following raw materials in weight percentage: 70-80wt% solvent, 2-6wt% ethylene-vinyl acetate copolymer, 16-27wt% wax powder; the ethylene-vinyl acetate copolymer preferably has a vinyl acetate content between 15% and 35%, and the wax powder is mainly PE wax powder, polystyrene wax powder, polyamide wax powder, etc., preferably with a narrow particle size range and a high melting point. Ethylene-vinyl acetate in the transfer layer provides good film-forming properties and good compatibility with wax. Wax ensures good peelability, wear resistance and clarity of the printed pattern during printing. The slipperiness of the wax itself further improves the alcohol resistance and friction resistance of the printed pattern.

[0010] The main function of the color development layer is to improve the adhesion and color development level of the thermal transfer material for the line number sticker label. The main components are composed of a pigment system, a resin system, a solvent, and a dispersant. The weight percentage of each component is: 5-10wt% of the pigment system, 15-20wt% of the resin system, 1-3wt% of the dispersant, and 67-75wt% of the solvent. Specifically, the pigment system is mainly composed of carbon black and solid particles. By weight, the content of carbon black is 95-98wt%, the content of solid particles is 2 ~5wt%, and the solid particles are preferably silicon dioxide with a particle size of 3 to 10μm, and the average particle size of the carbon black is 5μm; the resin system is composed of the following raw materials in weight percentage, polyester resin 60 to 80wt%, epoxy resin 20 to 40wt%; the solvent is composed of the following raw materials in weight percentage: one of butanone and methyl isobutyl ketone, one of cyclohexanone and toluene, added in a ratio of 1:2; the dispersant is polyester modified resin particles with hydroxyl groups, which have excellent wettability to pigments.

[0011] Furthermore, the polyester resin is a saturated copolymer resin, which is a resin obtained by introducing unsaturated groups into saturated hydrocarbon molecules to enable copolymerization. When the resin is modified, carboxyl and hydroxyl functional groups are formed at the ends of the molecular chains through chemical modification methods such as grafting and hybridization, so that it has good adhesion to various PET, PVC, PC and other materials. The glass transition temperature of the polyester resin is between 60 and 80°C, and the molecular weight is 10,000 to 30,000;

[0012] Furthermore, the epoxy resin forms a cross-linked structure by reacting an amine cross-linking agent with an epoxy group, thereby increasing the molecular weight and viscosity of the epoxy resin, thereby increasing the overall viscosity of the coating, making the coating evenly dispersed, maintaining internal stability, and being beneficial to improving production efficiency. The softening point temperature of the epoxy resin is between 100 and 110° C., and the molecular weight is 8,000 to 15,000.

[0013] Furthermore, the purity of the toluene, butanone, cyclohexanone and methyl isobutyl ketone is ≥ 99%.

[0014] Furthermore, the thickness of the heat insulation layer is 0.1-0.4 μm, the thickness of the substrate is 4.0-6.0 μm, the thickness of the transfer layer is 0.8-1.2 μm, and the thickness of the color development layer is 0.8-1.0 μm.

[0015] In this formula, the polyester resin has good adhesion to the substrate because it contains more side chains, hydroxyl and carboxyl functional groups, and the epoxy group of the epoxy resin. The narrow melting range of the polyester resin is conducive to the efficient transfer of the transfer layer. The epoxy resin has strong chain polarity and a cross-linked structure, which makes it have excellent alcohol resistance and friction resistance.

[0016] The present invention also provides a process for preparing a thermal transfer material for a line number label sticker, comprising the following steps:

[0017] S1. Preparation of thermal insulation layer: under the temperature condition of 40-80°C, add solvent, silicone resin and high-bonding resin in a proportion in a material reactor, dissolve the silicone resin and high-bonding resin in the solvent, keep the temperature for 1-2 hours to obtain coating A, wherein the solid content of the coating A is 5%, after cooling to room temperature, stand for 30 minutes without stratification, and then coat on the machine;

[0018] During coating, a ceramic anilox roller with a precision of 300 to 460 lines is used to coat the back of the substrate on a micro-gravure coater, the coating speed is 100 to 200 m / min, the drying temperature is 90 to 120° C., and the drying time is 5 to 10 seconds;

[0019] S2, preparation of transfer layer: under the temperature condition of 40-80°C, add solvent and ethylene-vinyl acetate copolymer in a proportion in a material reactor, dissolve ethylene-vinyl acetate copolymer in the solvent until it becomes clear and transparent, keep warm for 1-2h to obtain coating B, the solid content of coating B is 8%, after cooling to room temperature, add wax powder, grind with a sand mill, grind at a rate of 5kg / min, grind to an average particle size between 0.8 and 1μm, and a viscosity between 30 and 50cp, then coat on the machine;

[0020] During coating, a ceramic anilox roller with a precision of 200 to 350 lines is used to coat the front side of the substrate on a micro-gravure coater, the coating speed is 80 to 150 m / min, the drying temperature is 80 to 100°C, and the drying time is 8 to 15 seconds;

[0021] S3, preparation of color development layer: weigh the solvent in proportion and add it to a chemical kettle equipped with a heating interlayer and a stirring device, start stirring, then add the raw materials of the resin system weighed in proportion to the chemical kettle, turn on the heating, control the temperature at 40-80°C until it is completely dissolved, and obtain a light yellow transparent coating C; after the coating C in the chemical kettle is cooled to room temperature, add the raw materials and dispersant in the pigment system in proportion, stir evenly, and transfer to a horizontal sand mill for grinding at a grinding speed of 5-10kg / min. After grinding, a thermal transfer coating for line number sticker labels is obtained, the solid content of the thermal transfer coating is 32%, and the average particle size is 1.0-1.4μm. After standing for 30 minutes without precipitation at the bottom of the barrel, it can be coated on the machine;

[0022] During coating, a ceramic anilox roller with a precision of 300 to 400 lines is used to coat the surface of the transfer layer on a micro-gravure coater. The coating speed is 80 to 150 m / min, the drying temperature is 80 to 150° C., and the drying time is 8 to 15 seconds.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The invention can have good durability, heat resistance, alcohol resistance and friction resistance, wide applicability, rich colors and the like in the application of sticker labels, and is more suitable for use under harsh conditions, providing a reliable and efficient solution for product identification. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of each layer of a thermal transfer material for a line number sticker label in an embodiment of the present invention.

[0026] Figure 2 This is the pattern transferred in Example 1 of the present invention.

[0027] Figure 3 This is the pattern transferred in Example 2 of the present invention.

[0028] Figure 4 This is the pattern transferred in Example 3 of the present invention.

[0029] Figure 5 This is the pattern transferred in the comparative example of the present invention. DETAILED DESCRIPTION

[0030] The present invention is further described below with reference to specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0031] The raw materials used in the present invention are purchased from conventional channels or prepared by existing technical methods.

[0032] Example 1

[0033] like Figure 1 As shown, this embodiment provides a thermal transfer material for a line number sticker label, including a heat insulation layer, a substrate, a transfer layer and a color development layer;

[0034] The main function of the thermal insulation layer is to improve the smoothness of the thermal transfer material for line number stickers and labels when it passes through the machine for printing, reduce static electricity generation, enhance its heat resistance to ensure the integrity of the film, and protect the machine print head. The raw materials of the thermal insulation layer, measured by weight percentage, include 90wt% solvent, 7wt% silicone resin and 3wt% high-bonding resin. The high-bonding resin is polyester resin or polyurethane, and the silicone content in the silicone resin is more than 50% (the introduction of silicon groups increases its inherent anti-friction and high temperature resistance).

[0035] The substrate is a polyethylene terephthalate (PET) film with a thickness of 5 μm;

[0036] The transfer layer mainly appears as a protective layer, a wear-resistant layer and a peeling layer. The transfer layer includes the following raw materials in weight percentage: 70wt% solvent, 5wt% ethylene-vinyl acetate copolymer, and 25wt% wax powder; the vinyl acetate content in the ethylene-vinyl acetate copolymer is 30%, and the wax powder is mainly PE wax powder. The ethylene-vinyl acetate in the transfer layer provides good film-forming properties and has good compatibility with wax. The wax ensures good peelability, wear resistance and clarity of the printed pattern during printing. The slippery nature of the wax itself further improves the alcohol resistance and friction resistance of the printed pattern.

[0037] The main function of the color development layer is to improve the adhesion and color development level of the thermal transfer material used for the line number sticker label. The main components are composed of a pigment system, a resin system, a solvent, and a dispersant. Specifically, the pigment system includes carbon black and silica, and the particle size of silica is 3 to 10 μm, and the average particle size of carbon black is 5 μm; the resin system includes polyester resin and epoxy resin; the polyester resin is a saturated copolymer resin, which is a resin obtained by introducing unsaturated groups into saturated hydrocarbon molecules to enable copolymerization. When the resin is modified, carboxyl and hydroxyl functional groups are formed at the ends of the molecular chain through chemical modification methods such as grafting and hybridization, so that it has good adhesion to various materials such as PET, PVC, and PC. The glass transition temperature of the polyester resin is between 60 and 80°C, and the molecular weight is between 10,000 and 30,000. The epoxy resin forms a cross-linked structure by reacting an amine cross-linking agent with an epoxy group, thereby increasing the molecular weight and viscosity of the epoxy resin, thereby increasing the overall viscosity of the coating, making the coating evenly dispersed, maintaining internal stability, and being conducive to improving production efficiency. The softening point temperature of the epoxy resin is between 100 and 110°C, and the molecular weight is between 8,000 and 15,000.

[0038] In this formula, the polyester resin has good adhesion to the substrate because it contains more side chains, hydroxyl and carboxyl functional groups, and the epoxy group of the epoxy resin. The narrow melting range of the polyester resin is conducive to the efficient ink transfer of the transfer layer. The epoxy resin has strong chain polarity and a cross-linked structure, which makes it have excellent alcohol resistance and friction resistance.

[0039] Specifically, the raw materials of the color development layer, by weight percentage, include the following components: 13.6wt% polyester resin, 3.4wt% epoxy resin, 4.75wt% carbon black, 0.25wt% silica, 75wt% solvent and 3wt% dispersant, wherein the dispersant is polyester modified resin particles with hydroxyl groups, which have excellent wettability to pigments.

[0040] More specifically, the solvent includes butanone and toluene, and the weight ratio of butanone to toluene is 1:2, and the purity of the toluene and butanone is ≥99%.

[0041] In this embodiment, the thickness of the heat insulation layer is 0.2 μm, the thickness of the transfer layer is 0.8 μm, and the thickness of the color development layer is 0.8 μm.

[0042] A thermal transfer material for a line number label sticker in this embodiment is prepared by the following steps:

[0043] S1. Preparation of thermal insulation layer: under the temperature condition of 40-80°C, add solvent, silicone resin and high-bonding resin in a proportion in a material reactor, dissolve the silicone resin and high-bonding resin in the solvent, keep the temperature for 1-2 hours to obtain coating A, wherein the solid content of the coating A is 5%, after cooling to room temperature, stand for 30 minutes without stratification, and then coat on the machine;

[0044] During coating, a ceramic anilox roller with a precision of 300 to 460 lines is used to coat the back of the substrate on a micro-gravure coater, the coating speed is 100 to 200 m / min, the drying temperature is 90 to 120° C., and the drying time is 5 to 10 seconds;

[0045] S2, preparation of transfer layer: under the temperature condition of 40-80°C, add solvent and ethylene-vinyl acetate copolymer in a proportion in a material reactor, dissolve ethylene-vinyl acetate copolymer in the solvent until it becomes clear and transparent, keep warm for 1-2h to obtain coating B, the solid content of coating B is 8%, after cooling to room temperature, add wax powder, grind with a sand mill, grind at a rate of 5kg / min, grind to an average particle size between 0.8 and 1μm, and a viscosity between 30 and 50cp, then coat on the machine;

[0046] During coating, a ceramic anilox roller with a precision of 200 to 350 lines is used to coat the front side of the substrate on a micro-gravure coater, the coating speed is 80 to 150 m / min, the drying temperature is 80 to 100°C, and the drying time is 8 to 15 seconds;

[0047] S3, preparation of color development layer: weigh the solvent in proportion and add it to a chemical kettle equipped with a heating interlayer and a stirring device, start stirring, then add the raw materials of the resin system weighed in proportion to the chemical kettle, turn on the heating, control the temperature at 40-80°C until it is completely dissolved, and obtain a light yellow transparent coating C; after the coating C in the chemical kettle is cooled to room temperature, add the raw materials and dispersant in the pigment system in proportion, stir evenly, and transfer to a horizontal sand mill for grinding at a grinding speed of 5-10kg / min. After grinding, a thermal transfer coating for line number sticker labels is obtained, the solid content of the thermal transfer coating is 32%, and the average particle size is 1.0-1.4μm. After standing for 30 minutes without precipitation at the bottom of the barrel, it can be coated on the machine;

[0048] During coating, a ceramic anilox roller with a precision of 300 to 400 lines is used to coat the surface of the transfer layer on a micro-gravure coater. The coating speed is 80 to 150 m / min, the drying temperature is 80 to 150° C., and the drying time is 8 to 15 seconds.

[0049] Example 2

[0050] The difference between this embodiment and embodiment 1 is that:

[0051] The raw materials of the heat insulation layer include, by weight percentage, 92.5wt% solvent, 4.5wt% silicone resin and 3wt% high-bonding resin;

[0052] The raw materials of the transfer layer are calculated by weight percentage: 70wt% solvent, 4.5wt% ethylene-vinyl acetate copolymer, and 25.5wt% wax powder;

[0053] The raw materials of the color development layer include, by weight percentage, 12wt% polyester resin, 5wt% epoxy resin, 4.8wt% carbon black, 0.2wt% silicon dioxide, 75wt% solvent and 3wt% dispersant;

[0054] The thickness of the heat insulation layer is 0.2 μm, the thickness of the transfer layer is 1 μm, and the thickness of the color development layer is 0.8 μm.

[0055] Example 3

[0056] The difference between this embodiment and embodiment 1 is that:

[0057] The raw materials of the heat insulation layer include, by weight percentage, 95wt% solvent, 2wt% silicone resin and 3wt% high-bonding resin;

[0058] The raw materials of the transfer layer are calculated by weight percentage: 70wt% solvent, 6wt% ethylene-vinyl acetate copolymer, and 24wt% wax powder;

[0059] The raw materials of the color development layer include, by weight percentage, 10.2 wt % polyester resin, 6.8 wt % epoxy resin, 4.9 wt % carbon black, 0.1 wt % silicon dioxide, 75 wt % solvent and 3 wt % dispersant;

[0060] The thickness of the heat insulation layer is 0.2 μm, the thickness of the transfer layer is 1.2 μm, and the thickness of the color development layer is 0.8 μm.

[0061] Comparative Example

[0062] The difference between this comparative example and Example 1 is that:

[0063] The raw materials of the transfer layer are calculated by weight percentage: 70wt% solvent, 8wt% ethylene-vinyl acetate copolymer, and 22wt% wax powder;

[0064] The raw materials of the color development layer include, by weight percentage, 17 wt % polyester resin, 0 wt % epoxy resin, 5 wt % carbon black, 0 wt % silicon dioxide, 75 wt % solvent and 3 wt % dispersant.

[0065] Comparison test

[0066] The products obtained in the above Examples 1 to 3 and the comparative example were tested for printing contrast effects.

[0067] During the test, a label printer (model P900 / MAX LM-550) was used to transfer the following labels on PET and PP stickers: Figure 2 , 3 The patterns shown in 4 are printed at standard density. Use a label printer (MAX LM-550) to transfer the patterns on PET and PP stickers. Figure 2 , 3 , and the pattern shown in 4 has a printing density of 3.

[0068] in, Figures 2 to 4 These are the patterns transferred using the products of Examples 1 to 3, Figure 5 This is a pattern transferred using a product of a comparative example.

[0069] The formed images were visually checked and evaluated according to the following evaluation criteria:

[0070] A: No unprinted text, lines, or punctuation marks were observed in the image;

[0071] B: Less than 2 unprinted or unclearly printed characters, lines, and punctuation marks are observed in the image;

[0072] C: 2 to 10 or fewer unprinted or unclearly printed words, lines, and punctuation marks are observed in the image;

[0073] NG: 10 or more unprinted or unclearly printed characters, lines, and punctuation marks are observed in the image.

[0074] After the barcode is transferred, load the barcode with a 500g weight and wrap it with cotton cloth soaked with 0.5ml 75% alcohol, and rub the barcode back and forth 100 times.

[0075] The formed images were visually confirmed and evaluated according to the following evaluation criteria:

[0076] A: There is no image loss at all;

[0077] B: A few image points are missing, but not in a line.

[0078] C: There is slight shedding of threads;

[0079] NG: There is obvious thread shedding before the friction cycle is completed.

[0080] Color density test: Use an X-Rite spectrophotometer to measure the color density of the pattern and evaluate it according to the following evaluation criteria:

[0081] A: Color density is greater than or equal to 1.8;

[0082] B: Color density greater than or equal to 1.6;

[0083] C: Color density is greater than or equal to 1.5;

[0084] NG: Color density is less than 1.5.

[0085] The test results are as follows:

[0086] Test Category Example 1 Example 2 Example 3 Comparative Example Sticker Effect A A A C Alcohol resistance A A A B Color Density A A A B

[0087] According to the above test results:

[0088] The product provided by the present invention has rich printing colors, excellent abrasion resistance, alcohol resistance and good general effect, and can be applied to sticker labels of different line numbers and different printer types, such as PET transparent film and brother line number printer.

[0089] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. All technical variations made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A thermal transfer material for a line number sticker label, characterized in that: It comprises a heat-insulating layer, a substrate, a transfer layer and a color-developing layer, wherein the heat-insulating layer is coated on the back of the substrate, the transfer layer is coated on the front of the substrate, and the color-developing layer is coated on the transfer layer; The heat insulation layer comprises the following raw materials in weight percentage: 90-95wt% solvent, 2-7wt% silicone resin and 3-8wt% high-bonding resin, wherein the content of silicone in the silicone resin is more than 50%, and the high-bonding resin is polyester resin or polyurethane; The substrate is one of polyethylene terephthalate (PET) film, 1,4-polycyclohexylene dimethylene terephthalate film, polyethylene naphthalate (PEN) film, polyphenylene sulfide film, polystyrene (PS) film, polypropylene (PP) film, polyethylene (PE) film, polyvinyl chloride film, nylon film, and polyimide film; The transfer layer comprises the following raw materials in weight percentage: 70-80 wt % solvent, 2-6 wt % ethylene-vinyl acetate copolymer, and 16-27 wt % wax powder; The color development layer comprises the following raw materials in weight percentage: 5-10 wt % of a pigment system, 15-20 wt % of a resin system, 1-3 wt % of a dispersant and 67-75 wt % of a solvent.

2. The thermal transfer material for line number sticker labels according to claim 1, characterized in that: The content of vinyl acetate in the ethylene-vinyl acetate copolymer is between 15% and 35%.

3. The thermal transfer material for line number sticker label according to claim 1, characterized in that: The wax powder is one of PE wax powder, polystyrene wax powder and polyamide wax powder.

4. The thermal transfer material for line number sticker labels according to claim 1, characterized in that: The pigment system comprises the following raw materials in weight percentage: 95-98wt% carbon black and 2-5wt% silicon dioxide. The average particle size of the carbon black is 5μm, and the particle size of the silicon dioxide is 3-10μm.

5. The thermal transfer material for line number sticker label according to claim 1, characterized in that: The resin system comprises the following raw materials in weight percentage: 60-80wt% polyester resin and 20-40wt% epoxy resin, wherein the glass transition temperature of the polyester resin is between 60-80°C and the molecular weight is 10000-30000; the softening point temperature of the epoxy resin is between 100-110°C and the molecular weight is 8000-15000.

6. The thermal transfer material for line number sticker labels according to claim 1, characterized in that: The raw materials of the solvent include material A and material B, and the weight ratio of material A to material B is 1:

2. The material A is butanone or methyl isobutyl ketone, and the material B is cyclohexanone or toluene.

7. The thermal transfer material for line number sticker label according to claim 6, characterized in that: The purity of the toluene, butanone, cyclohexanone and methyl isobutyl ketone is ≥99%.

8. The thermal transfer material for line number sticker labels according to claim 1, characterized in that: The dispersant is polyester modified resin particles having hydroxyl groups.

9. The thermal transfer material for line number sticker labels according to claim 1, characterized in that: The thickness of the heat insulation layer is 0.1-0.4 μm, the thickness of the substrate is 4.0-6.0 μm, the thickness of the transfer layer is 0.8-1.2 μm, and the thickness of the color development layer is 0.8-1.0 μm.

10. A process for preparing a thermal transfer material for a line number sticker label according to any one of claims 1 to 9, characterized in that: The steps include: S1. Preparation of thermal insulation layer: under the temperature condition of 40-80°C, add solvent, silicone resin and high-bonding resin in a proportion in a material reactor, dissolve the silicone resin and high-bonding resin in the solvent, keep the temperature for 1-2 hours to obtain coating A, wherein the solid content of the coating A is 5%, after cooling to room temperature, stand for 30 minutes without stratification, and then coat on the machine; During coating, a ceramic anilox roller with a precision of 300 to 460 lines is used to coat the back of the substrate on a micro-gravure coater, the coating speed is 100 to 200 m / min, the drying temperature is 90 to 120° C., and the drying time is 5 to 10 seconds; S2, preparation of transfer layer: under the temperature condition of 40-80°C, add solvent and ethylene-vinyl acetate copolymer in a proportion in a material reactor, dissolve ethylene-vinyl acetate copolymer in the solvent until it becomes clear and transparent, keep warm for 1-2h to obtain coating B, the solid content of coating B is 8%, after cooling to room temperature, add wax powder, grind with a sand mill, grind at a rate of 5kg / min, grind to an average particle size between 0.8 and 1μm, and a viscosity between 30 and 50cp, then coat on the machine; During coating, a ceramic anilox roller with a precision of 200 to 350 lines is used to coat the front side of the substrate on a micro-gravure coater, the coating speed is 80 to 150 m / min, the drying temperature is 80 to 100°C, and the drying time is 8 to 15 seconds; S3, preparation of color development layer: weigh the solvent in proportion and add it to a chemical kettle equipped with a heating interlayer and a stirring device, start stirring, then add the raw materials of the resin system weighed in proportion to the chemical kettle, turn on the heating, control the temperature at 40-80°C until it is completely dissolved, and obtain a light yellow transparent coating C; after the coating C in the chemical kettle is cooled to room temperature, add the raw materials and dispersant in the pigment system in proportion, stir evenly, and transfer to a horizontal sand mill for grinding at a grinding speed of 5-10kg / min. After grinding, a thermal transfer coating for line number sticker labels is obtained, the solid content of the thermal transfer coating is 32%, and the average particle size is 1.0-1.4μm. After standing for 30 minutes without precipitation at the bottom of the barrel, it can be coated on the machine; During coating, a ceramic anilox roller with a precision of 300 to 400 lines is used to coat the surface of the transfer layer on a micro-gravure coater. The coating speed is 80 to 150 m / min, the drying temperature is 80 to 150° C., and the drying time is 8 to 15 seconds.

Images