Heat transfer printing resin thermal transfer ribbon for outdoor advertisement

Abstract

The invention relates to a heat transfer printing resin thermal transfer ribbon for outdoor advertisement, which comprises a base material layer, a back coating layer, an anti-dazzle protection layer and a color layer, the back coating layer is arranged on one side surface of the base material layer, the anti-dazzle protection layer is arranged on the other side surface of the base material layer, and the color layer is arranged on the anti-dazzle protection layer. According to the heat transfer printing thermal transfer ribbon for the outdoor advertisement, through structural and formula design of the heat transfer printing thermal transfer ribbon for the outdoor advertisement, a printed pattern can be reliably used outdoors, a good display effect is achieved, color uniformity can be kept in reflection and projection environments, and viewers can feel the consistent color effect from different angles in the daytime and at night.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal transfer resin ribbons, and more particularly to a thermal transfer resin ribbon for outdoor advertising. Background Art

[0002] With the development of large-width thermal transfer technology, thermal transfer outdoor signs have been widely used in fields such as electric power, petroleum, chemical industry, and transportation, and are accepted by the majority of customers. As an important application in the field of outdoor signs, existing outdoor advertising solutions are mainly prepared by spraying. Especially in the field of door head light box advertising, spraying and film pasting are the most common preparation processes. However, when using the spraying process, it is often necessary to use a weather-resistant protective film, resulting in high costs. When using the film pasting process to prepare door head light box advertising, the production process is complex and the efficiency is low. In view of this, by using the thermal transfer digital printing method to print advertising patterns on the door head light box cloth, the production efficiency can be effectively improved. At the same time, by designing the thermal transfer ribbon, it is possible to effectively ensure that the printed pattern has excellent weather resistance and high reliability in outdoor use. Summary of the Invention

[0003] The present invention provides a thermal transfer resin ribbon for outdoor advertising and a preparation method thereof to solve one or several of the technical problems existing in the prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: A thermal transfer resin ribbon for outdoor advertising includes a substrate layer, a back coating, an anti-glare protective layer, and a color layer. The back coating is provided on one side of the substrate layer, the anti-glare protective layer is provided on the other side of the substrate layer, and the color layer is provided on the anti-glare protective layer.

[0005] The beneficial effect of the present invention is that through the structural and formulation design of the thermal transfer ribbon for outdoor advertising, reliable use of the printed pattern outdoors can be achieved, and it has a good display effect, can maintain color uniformity in both reflective and projection environments, enabling viewers to feel a consistent color effect from different angles during the day and at night.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Further, the components of the anti-glare protective layer include thermoplastic polymethyl methacrylate, micro wax powder, and a first filler;

[0008] By weight percentage, the proportion of thermoplastic polymethyl methacrylate in the anti-glare protective layer is 80% - 90%, the proportion of micro wax powder in the anti-glare protective layer is 5% - 10%, and the proportion of the first filler in the anti-glare protective layer is 5% - 10%.

[0009] Furthermore, the molecular weight of the thermoplastic polymethyl methacrylate is 3000 to 15000, preferably 10000 to 15000; the Tg value is 60°C to 110°C, preferably 80°C to 100°C;

[0010] The micro wax powder is at least one of PE wax and Fischer-Tropsch wax; the particle size of the micro wax powder is 1 to 10 μm, preferably 1 to 7 μm; the melting point of the micro wax powder is 80°C to 120°C;

[0011] The first filler is at least one of silica matting powder, talc powder and kaolin.

[0012] The beneficial effect of adopting the above further scheme is that the thermoplastic methyl methacrylate copolymer used in the anti-glare protective layer provides good coatability for the anti-glare protective layer, and the thermoplastic methyl methacrylate has excellent thermal transfer peelability, ensuring the feasibility of thermal transfer. At the same time, the thermoplastic methyl methacrylate has excellent light and weather resistance. Although the thermoplastic methyl methacrylate has excellent peelability, due to its own characteristics, when performing high-resolution transfer, problems such as printing block dropping are likely to occur. In the present invention, by controlling the thickness of the anti-glare protective layer and the molecular weight of the thermoplastic methyl methacrylate, high-resolution printing can be satisfied.

[0013] Designing the micro wax powder and the anti-glare filler in the non-pigment coating can avoid their adverse effects on color dispersion and maintain the uniformity of the color display effect of the color layer.

[0014] The micro wax powder can be PE wax, Fischer-Tropsch wax, etc., preferably PE wax. The proportion of wax in the anti-glare protective layer is between 5% and 10%, the particle size is between 1 and 10 μm, preferably below 7 μm, and the melting point is between 80 and 120°C. Introducing the micro wax powder into the anti-glare protective layer can improve the scratch and wear resistance of the printed pattern.

[0015] The first filler can be selected from silica matting powder, talc powder, kaolin, etc., preferably silica matting powder; the content of the filler in the color layer is 5% - 10%, preferably 4% - 6%. The filler can effectively reduce glare, make the reflection of light on the film surface more uniform and soft, reduce the bright spots or dark areas caused by the concentrated reflection of light, and contribute to maintaining the uniformity of color in the reflection and projection environments, enabling viewers to feel the same color performance from different angles.

[0016] Furthermore, the preparation method of the anti-glare protective layer is to dissolve, grind and disperse the thermoplastic polymethyl methacrylate, the micro wax powder and the first filler to prepare an anti-glare protective layer coating solution, and then use a 500-line ceramic gravure roll to coat the anti-glare protective layer coating solution on the substrate by an intaglio coater, and dry it at 80°C to 100°C, with a coating speed of 60 to 100 m / min.

[0017] Further, the components of the color layer include phenolic resin, thermoplastic methyl methacrylate, pigment, and plasticizer;

[0018] By weight percentage, the proportion of the phenolic resin in the color layer is 5% - 15%, the proportion of the thermoplastic methyl methacrylate in the color layer is 30% - 45%, the proportion of the pigment in the color layer is 45% - 60%, and the proportion of the plasticizer in the color layer is 1% - 10%.

[0019] Further, the molecular weight of the thermoplastic methyl methacrylate is 120,000 - 300,000, preferably 150,000 - 250,000; Tg > 100 °C, preferably 100 °C - 105 °C.

[0020] The beneficial effects of adopting the above further scheme are as follows: The content of thermoplastic methyl methacrylate in the color layer is between 30% - 45%. The thermoplastic methyl methacrylate has good light transmittance, excellent light and weather resistance, and good transferability, which can ensure that the carbon ribbon has good transfer ability. The selection of high molecular weight effectively ensures the outdoor use reliability of the pattern after transfer. At the same time, with the precise design of the anti-glare protective layer, problems such as insufficient resolution can be effectively avoided.

[0021] The content of phenolic resin in the color layer is 5% - 15%; phenolic resin has good high-temperature resistance, and the coating after transfer has excellent flame retardant effect.

[0022] The pigment is a high weather-resistant pigment, and high weather-resistant pigments of different colors such as yellow (such as Yellow 110, Yellow 150, Yellow 139), red (such as Red 149, Red 254, Red 264), blue (phthalocyanine blue, ultramarine blue), green (phthalocyanine blue), black (carbon black) can be selected. The proportion in the color layer is between 45% - 60%. Selecting this type of pigment has good light and weather resistance, which can ensure the outdoor use reliability of the pattern after printing. Insufficient pigment content in the color layer will lead to a decline in light and weather resistance; grinding the color layer and controlling its particle size D50 < 0.08um and D100 < 0.1um can make the pigment evenly distributed in the coating. Under the action of light, and there are no other solid substances in the color layer, so the absorption and reflection of light with different wavelengths in the color layer are relatively consistent, and the entire film surface presents a uniform color effect, avoiding color differences caused by pigment agglomeration or uneven distribution.

[0023] For the plasticizer, commonly used plasticizers such as epoxidized soybean oil, dioctyl phthalate, dibutyl phthalate, etc. can be selected, and the content is generally 1% - 10% of the methyl methacrylate copolymer. The use of plasticizer can improve the use reliability of the pattern after printing;

[0024] Further, the components of the color layer further include anti-aging additives.

[0025] The beneficial effects of adopting the above further solution are as follows: By adding light absorbers, light stability additives, antioxidants, etc., the weather resistance of the printed pattern can be further improved.

[0026] Further, the preparation method of the color layer is as follows: Dissolve phenolic resin, thermoplastic methyl methacrylate, pigment and plasticizer, and grind them to prepare a color layer coating solution, so that the particle size of the pigment is D50 < 0.08um and D100 < 0.1um; Use a 230-line ceramic gravure roll, and coat the color layer coating solution on the PET substrate by an intaglio coater, and dry it at 80°C to 100°C, and the coating speed is 60 to 100 m / min.

[0027] Further, the thickness of the substrate layer is 4 to 10μm; the thickness of the anti-glare protective layer is 0.1 to 0.3μm; the thickness of the back coating layer is 0.1 to 0.5μm; the thickness of the color layer is 0.6 to 1.2μm;

[0028] The substrate layer is made of one of polyethylene terephthalate film, 1,4-polycyclohexylene dimethylene terephthalate film, polyethylene naphthalate film, polyphenylene sulfide film, polystyrene film, polypropylene film, polyethylene film, polyvinyl chloride film, nylon film, polyimide film;

[0029] The components of the back coating layer include cellulose acetate propionate, polyvinyl acetal resin, polyvinyl butyral resin, binder, lubricant, second filler, crosslinking agent;

[0030] The preparation method of the back coating layer is as follows: Dissolve the components of the back coating layer to make a back coating layer coating solution, and then use a 300-line ceramic gravure roll to coat the back coating layer coating solution on the substrate layer by an intaglio coater, and dry it at 60°C to 100°C, and the coating speed is 60 - 100 m / min. Brief Description of the Drawings

[0031] Figure 1 It is a layered structure diagram of the thermal transfer resin ribbon for outdoor advertising of the present invention.

[0032] In the drawings, the list of components represented by each reference numeral is as follows:

[0033] 1. Substrate layer; 2. Anti-glare protective layer; 3. Color layer; 4. Back coating layer. Detailed Embodiments

[0034] The principles and features of the present invention are described below with reference to the drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0035] Example 1

[0036] As Figure 1 shown, a thermal transfer resin ribbon for outdoor advertising includes a substrate layer 1, a back coating layer 4, an anti-glare protective layer 2, and a color layer 3. The back coating layer 4 is disposed on one side of the substrate layer 1, the anti-glare protective layer 2 is disposed on the other side of the substrate layer 1, and the color layer 3 is disposed on the anti-glare protective layer 2.

[0037] The substrate layer 1 is made of polyethylene terephthalate (PET) film.

[0038] The raw materials for the back coating layer 4 are weighed in the following proportions: 60 parts of 2-butanone, 25 parts of toluene, 10 parts of cellulose acetate propionate, 0.5 part of polyester resin, 0.3 part of zinc stearate, 0.25 part of phosphate ester, 0.2 part of glycerol dioleate, 2 parts of isocyanate, 0.3 part of talc, 0.2 part of silica, and 0.3 part of antistatic agent. The preparation method of the back coating layer is as follows: First, dissolve cellulose acetate propylene and polyester resin in a mixed solvent of 2-butanone and toluene, then add zinc stearate, phosphate ester, glycerol dioleate, talc, silica, and antistatic agent and stir well for 2 hours, and then add isocyanate and stir for 0.5 hour to obtain the back coating liquid.

[0039] The raw materials for the anti-glare protective layer 2 are weighed in the following proportions: 45 parts of 2-butanone, 45 parts of toluene, 8 parts of thermoplastic methyl methacrylate, 1 part of micro wax powder, and 1 part of the first filler. The molecular weight of the thermoplastic polymethyl methacrylate is 13,000; the Tg value is 65 °C; the micro wax powder is PE wax; the particle size of the micro wax powder is 5 μm; the melting point of the micro wax powder is 105 °C; the first filler is silica matting powder. The preparation method of the anti-glare protective layer 2 is to dissolve, grind, and disperse thermoplastic polymethyl methacrylate, micro wax powder, and the first filler to prepare the anti-glare protective layer coating liquid, and then use a 500-line ceramic gravure roll and an intaglio coater to coat the anti-glare protective layer coating liquid on the substrate, and dry it at 80 °C, and the coating speed is 100 m / min.

[0040] The raw materials for the color layer 3 are weighed in the following proportions: 40 parts of 2-butanone, 40 parts of toluene, 8 parts of thermoplastic methyl methacrylate, 2 parts of phenolic resin, and 10 parts of pigment. The molecular weight of the thermoplastic methyl methacrylate is 240,000; Tg = 105 °C; the preparation method of the color layer 3 is to dissolve, grind, and configure phenolic resin, thermoplastic methyl methacrylate, pigment, and plasticizer into the color layer coating liquid. After grinding, the particle size of the pigment is D50 = 0.06 μm, D100 = 0.7 μm. Use a 230-line ceramic gravure roll and an intaglio coater to coat the color layer coating liquid on the PET substrate and dry it at 80 °C. The coating speed is 100 m / min.

[0041] When preparing a thermal transfer resin ribbon for outdoor advertising, corona is applied to both side surfaces of the substrate layer 1; a back coating layer 4 is coated on one side surface of the substrate layer 1; an anti-glare protective layer 2 is coated on the other side surface of the substrate layer 1; and a color layer 3 is coated on the anti-glare protective layer 2. The thickness of the substrate layer 1 is 4.5 μm; the thickness of the anti-glare protective layer 2 is 0.2 μm; the thickness of the back coating layer 4 is 0.3 μm; and the thickness of the color layer 3 is 1.1 μm.

[0042] Example 2

[0043] For the color layer of this example, raw materials are weighed according to the following proportions: 40 parts of 2-butanone, 40 parts of toluene, 8 parts of thermoplastic methyl methacrylate, 0.5 part of phenolic resin, and 11.5 parts of pigment. The rest is the same as in Example 1.

[0044] Example 3

[0045] For the color layer of this example, raw materials are weighed according to the following proportions: 40 parts of 2-butanone, 40 parts of toluene, 7 parts of thermoplastic methyl methacrylate, 2 parts of phenolic resin, and 11 parts of pigment. The rest is the same as in Example 1.

[0046] Example 4

[0047] For the color layer of this example, raw materials are weighed according to the following proportions: 40 parts of 2-butanone, 40 parts of toluene, 9 parts of thermoplastic methyl methacrylate, 1 part of phenolic resin, and 10 parts of pigment.

[0048] For the anti-glare protective layer of this example, raw materials are weighed according to the following proportions: 45 parts of 2-butanone, 45 parts of toluene, 8.58 parts of thermoplastic methyl methacrylate, 0.7 part of micro wax powder, 0.7 part of the first filler, and 0.02 part of anti-aging additive.

[0049] The rest is the same as in Example 1.

[0050] Example 5

[0051] For the color layer of this example, raw materials are weighed according to the following proportions: 40 parts of 2-butanone, 40 parts of toluene, 6 parts of thermoplastic methyl methacrylate, 2 parts of phenolic resin, and 12 parts of pigment. The rest is the same as in Example 1.

[0052] Example 6

[0053] For the color layer of this example, raw materials are weighed according to the following proportions: 40 parts of 2-butanone, 40 parts of toluene, 8 parts of thermoplastic methyl methacrylate, 3 parts of phenolic resin, and 9 parts of pigment. The rest is the same as in Example 1.

[0054] Example 7

[0055] The anti-glare protective layer of this embodiment weighs raw materials in the following proportions: 45 parts of 2-butanone, 45 parts of toluene, 9 parts of thermoplastic methyl methacrylate, 0.5 part of micro wax powder, 0.5 part of the first filler, and 0 part of anti-aging additive. The rest is the same as in Embodiment 1.

[0056] Example 8

[0057] The anti-glare protective layer of this embodiment weighs raw materials in the following proportions: 45 parts of 2-butanone, 45 parts of toluene, 9 parts of thermoplastic methyl methacrylate, 0.5 part of micro wax powder, 0.48 part of the first filler, and 0.02 part of anti-aging additive. The rest is the same as in Embodiment 1.

[0058] Comparative Example 1

[0059] The color layer of this embodiment weighs raw materials in the following proportions: 40 parts of 2-butanone, 40 parts of toluene, 5 parts of thermoplastic methyl methacrylate, 5 parts of phenolic resin, and 10 parts of pigment.

[0060] The rest is the same as in Embodiment 1.

[0061] Comparative Example 2

[0062] The anti-glare protective layer of this comparative example weighs raw materials in the following proportions: 45 parts of 2-butanone, 45 parts of toluene, 9 parts of thermoplastic methyl methacrylate, 1 part of micro wax powder, and 0 part of the first filler.

[0063] The rest is the same as in Embodiment 1.

[0064] Now, the transfer integrity, abrasion resistance of the printed pattern, display effect of the printed pattern, and accelerated aging test of the printed pattern of the resin carbon ribbon are carried out according to the following method;

[0065] Transfer integrity test:

[0066] Use a thermal transfer traffic sign printer (manufactured by Hunan Dingyi Intelligent Manufacturing Company, model DTP-1300) to print a set pattern on 3M PⅡ light box cloth;

[0067] Visually confirm the formed image and evaluate it according to the following evaluation criteria:

[0068] A: No untransferred pattern area is observed in the image;

[0069] B: <0.1% of untransferred pattern is observed in the image;

[0070] C: <1% of untransferred pattern is observed in the image;

[0071] NG: >1% of untransferred pattern is observed in the image.

[0072] Abrasion resistance test of the transferred pattern:

[0073] Use a thermal transfer traffic sign printer (manufactured by Hunan Dingyi Zhizao Co., Ltd., model DTP-1300) to print a set pattern on 3M PⅡ light box cloth.

[0074] Test with an abrasion tester under a load of 2 kg, using Dowling paper to rub 500 times, and evaluate according to the following evaluation criteria:

[0075] OK: After the friction test, there is no white showing through.

[0076] NG: After the friction test, there is white showing through.

[0077] Accelerated aging test of the transferred pattern:

[0078] Use a thermal transfer traffic sign printer (manufactured by Hunan Dingyi Zhizao Co., Ltd., model DTP-1300) to print a set pattern on 3M PⅡ light box cloth.

[0079] According to the operation method of "GB / T 16422.2-2014 Plastics - Methods of exposure to laboratory light sources - Part 2: Xenon-arc lamps", the test cycle is 1800 h;

[0080] Visually confirm the formed image and evaluate according to the following evaluation criteria:

[0081] OK: The pattern has no obvious fading.

[0082] NG: The pattern has obvious fading.

[0083] Display effect test:

[0084] Use a thermal transfer traffic sign printer (manufactured by Hunan Dingyi Zhizao Co., Ltd., model DTP-1300) to print a set pattern on 3M PⅡ light box cloth, observe the color in transmission and reflection modes respectively, and evaluate according to the following evaluation criteria:

[0085] OK: There is no obvious difference in color display between transmission and reflection.

[0086] NG: There is an obvious difference in color display between transmission and reflection.

[0087] Accelerated aging test of the transferred pattern:

[0088] Use a thermal transfer traffic sign printer (manufactured by Hunan Dingyi Zhizao Co., Ltd., model DTP-1300) to print a set pattern on 3M PⅡ light box cloth.

[0089] According to the operation method of "GB / T 16422.2-2014 Plastics - Methods of exposure to laboratory light sources - Part 2: Xenon-arc lamps", the test cycle is 1800 h;

[0090] Visually confirm the formed image and evaluate it according to the following evaluation criteria:

[0091] OK: The pattern has no obvious fading;

[0092] NG: The pattern has obvious fading;

[0093] The test results of Examples 1 to 8, Comparative Example 1, and Comparative Example 2 are shown in the following table.

[0094] Table 1 Test results of Examples 1 to 8

[0095]

[0096] Table 2 Test results of Comparative Example 1 and Comparative Example 2

[0097] Comparative Example 1 Comparative Example 2 Transfer Integrity Test NG OK Wear Resistance Test OK OK Display Effect Test OK NG Accelerated Aging Test NG OK

[0098] As can be seen from Table 1 and Table 2, by comparing Example 1 with Comparative Example 1, it can be known that the content of phenolic resin in the color layer of Comparative Example 1 is too high, its transferability is poor, and the weather resistance of phenolic resin is worse than that of polymethyl methacrylate, which further affects its weather resistance. After xenon lamp aging, the fading is obvious and the color difference is large; while by comparing Example 1 with Comparative Example 2, it can be known that no filler is added to the anti-glare protective layer of Comparative Example 2, and the surface of the pattern shows brightness after transfer. When observed from different angles, due to the reflection effect, the color display difference is large, which cannot meet the advertising requirements.

[0099] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0100] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0101] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A thermal transfer resin ribbon for outdoor advertising, characterized in that: The invention comprises a substrate layer, a back coating layer, an anti-glare protective layer and a color layer, wherein the back coating layer is arranged on one side of the substrate layer, the anti-glare protective layer is arranged on the other side of the substrate layer, and the color layer is arranged on the anti-glare protective layer.

2. The thermal transfer resin ribbon for outdoor advertising according to claim 1, characterized in that: The components of the anti-glare protective layer include thermoplastic polymethyl methacrylate, micro wax powder and a first filler; In terms of weight percentage, the thermoplastic polymethyl methacrylate accounts for 80% to 90% of the anti-glare protective layer, the micro wax powder accounts for 5% to 10% of the anti-glare protective layer, and the first filler accounts for 5% to 10% of the anti-glare protective layer.

3. The thermal transfer resin ribbon for outdoor advertising according to claim 2, characterized in that: The molecular weight of the thermoplastic polymethyl methacrylate is 3000 to 15000; the glass transition temperature Tg value is 60° C. to 110° C.; The micro wax powder is at least one of PE wax and Fischer-Tropsch wax; the particle size of the micro wax powder is 1 to 10 μm; the melting point of the micro wax powder is 80° C. to 120° C.; The first filler is at least one of silicon dioxide matting powder, talcum powder and kaolin.

4. The thermal transfer resin ribbon for outdoor advertising according to claim 2, characterized in that: The preparation method of the anti-glare protective layer is to dissolve, grind and disperse thermoplastic polymethyl methacrylate, micro wax powder and a first filler to prepare an anti-glare protective layer coating liquid, and then use a 500-line ceramic anilox roller and a gravure coater to coat the anti-glare protective layer coating liquid on a substrate, dry it at 80°C to 100°C, and the coating speed is 60 to 100 m / min.

5. The thermal transfer resin ribbon for outdoor advertising according to claim 1, characterized in that: The components of the color layer include phenolic resin, thermoplastic methyl methacrylate, pigment and plasticizer; In terms of weight percentage, the phenolic resin accounts for 5% to 15% of the color layer, the thermoplastic methyl methacrylate accounts for 30% to 45% of the color layer, the pigment accounts for 45% to 60% of the color layer, and the plasticizer accounts for 1% to 10% of the color layer.

6. The thermal transfer resin ribbon for outdoor advertising according to claim 5, characterized in that: The molecular weight of the thermoplastic methyl methacrylate is 120,000 to 300,000, and Tg is greater than 100°C.

7. The thermal transfer resin ribbon for outdoor advertising according to claim 5, characterized in that: The components of the color layer also include an anti-aging aid.

8. The thermal transfer resin ribbon for outdoor advertising according to claim 5, characterized in that: The preparation method of the color layer is as follows: phenolic resin, thermoplastic methyl methacrylate, pigment and plasticizer are dissolved and ground to prepare a color layer coating liquid, so that the particle size of the pigment is D50<0.08um, D100<0.1um; a 230-line ceramic anilox roller is used to coat the color layer coating liquid on a PET substrate using a gravure coater, and the coating is dried at 80℃~100℃, and the coating speed is 60~100m / min.

9. The thermal transfer resin ribbon for outdoor advertising according to claim 1, characterized in that: The thickness of the substrate layer is 4-10 μm; the thickness of the anti-glare protective layer is 0.1-0.3 μm; the thickness of the back coating layer is 0.1-0.5 μm; the thickness of the color layer is 0.6-1.2 μm; The substrate layer is one of polyethylene terephthalate film, 1,4-polycyclohexylene dimethylene terephthalate film, polyethylene naphthalate film, polyphenylene sulfide film, polystyrene film, polypropylene film, polyethylene film, polyvinyl chloride film, nylon film and polyimide film.

10. The thermal transfer resin ribbon for outdoor advertising according to claim 1, characterized in that: The components of the back coating layer include cellulose acetate propionate, polyvinyl acetal resin, polyvinyl butyral resin, a binder, a lubricant, a second filler, and a cross-linking agent; The preparation method of the back coating layer is to dissolve the components of the back coating layer to prepare a back coating liquid, and then use a 300-line ceramic anilox roller and a gravure coater to coat the back coating liquid on the substrate layer, dry it at 60-100°C, and the coating speed is 60-100m / min.

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