A high-definition thermal transfer paper for carbon ribbon and a method for manufacturing the same

Abstract

The application discloses a kind of high-definition carbon tape thermal transfer paper and preparation method thereof, it is related to the technical field of carbon tape thermal transfer coating paper.A kind of high-definition carbon tape thermal transfer paper, including paper base layer and carbon tape thermal transfer coating layer, the coating of carbon tape thermal transfer coating layer includes composite filler, adhesive, water retaining agent, lubricant, dispersing agent;Composite filler includes first filler and second filler;The oil absorption value of first filler is not less than 70, D50 particle size is 3-4um;The oil absorption value of second filler is not less than 150, D50 particle size is 3-4um.The carbon tape thermal transfer paper described in the application compared with traditional carbon tape thermal transfer paper, need not be carried out multiple or multilayer coating treatment, utilize special functional water-based paint to be directly to paper base once single layer coating, multilayer coating process is saved, low in cost.And it is suitable for different types of carbon tape thermal transfer printer and carbon tape, so that printed pattern and bar code have the characteristics of high-definition, and good scratch-resistant effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon ribbon thermal transfer printing coated paper, in particular to a high-definition carbon ribbon thermal transfer printing paper and a preparation method thereof. BACKGROUND

[0002] At present, in some special use fields with harsh environmental requirements, carbon ribbon and carbon ribbon thermal transfer printing paper are still needed as information carriers to carry information such as text, bar codes, two-dimensional codes, etc. of articles, such as high-end clothing labels, showcase labels, heating electrical labels, super-long shelf life or super-strong protection type labels, etc. Traditional copper plate paper is generally used as a kind of transfer printing paper to carry the wax, resin and carbon ink on the carbon ribbon to display the carried information. However, the surface of the copper plate paper is rough and has poor adsorption capacity for carrying carbon powder, the printed information is not clear, is easy to be smeared, the printed information is easy to be scratched off or even to fall off, etc. which leads to the loss of scanning information and affects the actual use effect, especially in high-end fields, which causes many troubles.

[0003] The existing technical path is mainly from the carbon ribbon itself, and there are wax-based, resin-based and mixed-based varieties and formula processes for different needs of clarity and application. Resin-based and mixed-based carbon ribbons can provide relatively clear and non-smearing printing effect compared with wax-based carbon ribbons, but they are expensive and the carbon ribbons and carbon ribbon transfer printing papers are not universal. Traditional copper plate paper or imported carbon ribbon thermal transfer printing paper needs single-layer high coating or multi-layer coating, which increases the material cost and production cost; and the copper plate paper has the problem of easy smearing, which often leads to unusable bar code information due to mutual contact, scratching or friction with the label object or other objects.

[0004] Traditional copper plate paper is coated with single-layer high coating, and relatively good flatness can be obtained by using boot pressure on the equipment. The boot pressure equipment is expensive, and the material cost, equipment cost and operation and maintenance cost are high. And the main material uses heavy calcium carbonate as adsorption filler and uses latex as adhesive, but the oil absorption value of heavy calcium carbonate is less than 50, the carbon ribbon transfer is easy to be scratched and smeared, and the flatness cannot meet the requirements of high definition. Other imported carbon ribbon paper generally uses multi-coating, first filling coating with calcium carbonate material for interwoven fibers, and then transfer carrying layer coating with fumed silica. The multi-coating process is complex, and the production cost is high due to the high energy consumption requirement of fumed silica for dispersion. The existing products mainly match wax-based carbon ribbons and part of mixed-based carbon ribbons to obtain relatively clear effect by conventional printing, but the transferred information is easy to be smeared by scratching, cannot be scanned, and has poor adaptability to printer levels, and the printing effect is not good when using low or high level printers, and has poor applicability to resin-based carbon ribbons. SUMMARY

[0005] The present application aims at overcoming the deficiencies of the prior art and provides a high-definition carbon ribbon thermal transfer paper and a preparation method thereof.The carbon ribbon thermal transfer paper of the present application does not need to be subjected to multiple or multilayer coating treatment, but is directly subjected to single-layer coating on the paper base by using a special functional water-based coating, thereby eliminating the multilayer coating process, making it more economical and low in cost, and low in requirement for production equipment.The carbon ribbon thermal transfer paper of the present application is suitable for different types of carbon ribbon thermal transfer printers and carbon ribbons on the market, and has the characteristics of high-definition printing patterns and bar codes, and good scratch resistance, thereby preventing information loss.

[0006] To achieve the above object, the technical scheme adopted by the present application is as follows:

[0007] In a first aspect, the present application provides a high-definition carbon ribbon thermal transfer paper, comprising a paper base layer and a carbon ribbon thermal transfer coating layer, wherein the coating component of the carbon ribbon thermal transfer coating layer comprises a composite filler, an adhesive, a water-retaining agent, a lubricant and a dispersant.

[0008] The composite filler comprises a first filler and a second filler; the oil absorption value of the first filler is not less than 70, and the D50 particle size is 3-4 um; the oil absorption value of the second filler is not less than 150, and the D50 particle size is 3-4 um.

[0009] The present application controls the particle size and oil absorption value of the first filler and the second filler in the above range by compounding the first filler and the second filler, which is beneficial to controlling the flatness of the coating. If the particle size is too low, the surface energy is high, and the dispersion difficulty increases, and if the particle size is too large, the oil absorption value decreases and is not conducive to the flatness control of the coating.

[0010] Preferably, the oil absorption value of the first filler is 70-80, and the oil absorption value of the second filler is 150-220.

[0011] Preferably, the mass ratio of the first filler to the second filler is 1:(1-8), and further preferably 1:(4-6.5).

[0012] Preferably, the first filler is precipitated silica, and the second filler is calcined kaolin, which has a loose amorphous porous structure after high-temperature calcination and good adsorption performance.

[0013] Preferably, the amount of the composite filler is 40-77% of the total mass of the components, and preferably 55-77%.

[0014] Preferably, the amount of the adhesive is 20-30% of the total mass of the components, and preferably 20-25%.

[0015] Preferably, the amount of the water-retaining agent is 0.5-2% of the total mass of the components.

[0016] Preferably, the amount of the lubricant is 0.5-2% of the total mass of the components.

[0017] Preferably, the amount of the dispersant is 0.1-0.5% of the total mass of the components.

[0018] Preferably, the composite filler further comprises other fillers with a D50 particle size less than 1 um, specifically at least one of kaolin, mica powder, bentonite, calcium carbonate, white carbon black, and talc powder.

[0019] Preferably, the other fillers account for 0-5% of the mass percentage of the composite filler.

[0020] Preferably, the composite filler further comprises functional material thermal phase change polymer spherical particles with a D50 particle size less than 1 um, and the functional material thermal phase change polymer spherical particles account for 5-10% of the mass percentage of the composite filler.

[0021] The present application uses the above-mentioned polymer spherical particles with specific particle sizes, which can greatly fill the gaps formed by the first and second fillers, further fill the fiber paper surface, and effectively improve the flatness of the coating through ordinary calendering process.

[0022] The above-mentioned functional material thermal phase change polymer spherical particles can also act as a light adhesive. The thermal phase change temperature of the polymer spherical particles is lower than 90℃, preferably 60-80℃, which is conducive to filling the filler gaps during calendering, quickly recovering light adhesion and bonding with the carbon ribbon during printing, and closely combining with the carbon ribbon. The polymer spherical particles include at least one of polyurea water-based emulsion, polyurethane water-based emulsion, polyamide water-based emulsion, polyalkane water-based emulsion, and polyolefin water-based emulsion, preferably polyalkane water-based emulsion, and further preferably polyalkane water-based emulsion with a carbon atom number of 18-30.

[0023] Preferably, the adhesive comprises a first adhesive and a second adhesive. The first adhesive is polyvinyl alcohol with a degree of polymerization of 500-2500, and an alcoholysis degree of 88%, which has good bonding effect and water retention, and is conducive to the long-term stability of the thermal transfer printing coating during coating production. The polyvinyl alcohol can be specifically selected from at least one of 17-88, 14-88, and 05-88.

[0024] Preferably, the second adhesive comprises at least one of styrene-butadiene latex, nitrile-butadiene latex, chloroprene latex, styrene-acrylate latex, acrylic latex, polyurethane latex, polyester emulsion, and epoxy resin emulsion, preferably polyurethane latex, and more preferably polyether-modified polyurethane emulsion, which has stronger adhesive capacity for fillers, carbon powder, and other resins, and is conducive to improving scratch resistance and paste code after carbon ribbon transfer printing.

[0025] Preferably, the film-forming temperature of the second adhesive is lower than 30℃, the TG is lower than 50℃, and the second adhesive can be well matched with polyvinyl alcohol to form a film.

[0026] The first adhesive and the second adhesive are used in the application to make the components in the coating adhere to each other closely and have certain film-forming effect, and to have certain viscosity when heated, thereby making the coating adhere to the substance transferred from the carbon tape more firmly.

[0027] Preferably, the mass ratio of the first adhesive to the second adhesive is 1:(3-10), preferably 1:(5-8).

[0028] Preferably, the dispersant includes at least one of sodium oleate, carboxylate, sulfate, sulfonate, and polyacrylic acid, and is preferably sulfonate.

[0029] The dispersant is used to ensure the uniform and sufficient dispersion effect and dispersion stability of the filler.

[0030] Preferably, the water-retaining agent includes at least one of polyacrylic acid polymer, cellulose, and sodium alginate, and the water retention value of the coating is required to be not less than 150g / m 2 .

[0031] Preferably, the lubricant includes at least one of zinc stearate, calcium stearate, paraffin, and silicone oil, and more preferably, the lubricant is calcium stearate.

[0032] Preferably, the coating of the carbon tape thermal transfer coating further includes a fluorescent whitening agent, and the fluorescent whitening agent is at least one of disodium distyrylbiphenyl disulfonate, tetrasodium distyrylbiphenyl disulfonate, and hexasodium distyrylbiphenyl disulfonate.

[0033] The fluorescent whitening agent is used to improve the visual appearance of the coating.

[0034] Preferably, the amount of the fluorescent whitening agent is 0-0.5% of the total mass of the components.

[0035] Preferably, the paper base layer is prepared by using short fibers or long fibers, and is sized on one side or both sides, and the smooth side is selected as the coating surface, and the roughness of the smooth side is not higher than 3.5um.

[0036] Preferably, in the paper base layer, the mass ratio of long fibers to the total fibers is less than 20%, and the mass ratio of short fibers to the total fibers is not less than 80%. The mass ratio of the filler (composite filler) to the total mass of the paper base is less than 15%, and the particle size of the filler is less than 35um.

[0037] Preferably, the paper base layer is subjected to single-sided or double-sided sizing surface treatment, and the sizing process can be selected from rosin sizing, AKD, starch, etc. The paper base treated by sizing can effectively prevent the functional substances of the multifunctional carbon ribbon thermal transfer coating from penetrating or migrating into the paper base during coating processing, thereby ensuring that the functional substances stay on the surface of the paper base.

[0038] Preferably, the carbon ribbon thermal transfer coating is coated by a carbon ribbon thermal transfer coating material. The coating can be made by a coating method selected from a bar, a doctor blade, a curtain, a slope flow, an air knife, etc. After drying and calendering, the carbon ribbon thermal transfer coating has a smoothness of not less than 300 seconds and a roughness of less than 1.5 um.

[0039] Preferably, the thickness of the carbon ribbon thermal transfer coating is not higher than 8 um.

[0040] In a second aspect, the present application further provides a preparation method of the high-definition carbon ribbon thermal transfer paper, comprising the following steps:

[0041] (1) dispersing a dispersing agent in water, then dispersing a glue, a water retaining agent and a lubricant in the water, adding a composite filler, and mixing uniformly to obtain a coating material;

[0042] (2) coating the coating material on the smooth surface of the paper base, drying, and calendering to obtain the high-definition carbon ribbon thermal transfer paper; the coating amount is 5-8 g / m 2 .

[0043] Preferably, the coating material of the high-definition carbon ribbon thermal transfer paper uses water as the solvent, and the water content of the coating material is 50-80%, preferably 65-75%.

[0044] Compared with the prior art, the present application has the following beneficial effects:

[0045] 1. The present application uses multifunctional thermal transfer coating material and low-roughness sized base paper to prepare the carbon ribbon transfer paper with smooth and flat coating surface, thereby obtaining the high-definition bar code printing grade.

[0046] 2. The present application uses a plurality of fillers with high oil absorption value and mutually matched particle size to match the functional material thermal phase change spherical particles. The fillers fill the paper surface, and under the conditions of heat and pressure in the calendering link, the coating surface slightly deforms, the gaps in the paper surface are better inlaid and filled, the flat and smooth effect is achieved, the roughness is less than 1.5 um, and the carbon ribbon material is tightly matched, the mutual absorption and bearing effect is achieved, the bar code clarity grade is improved, the functional material thermal phase change spherical particles have certain adhesive capacity when printing is heated, and the adhesion of the fillers and the adhesive is further improved.

[0047] 3、The application adopts PVA, water-retaining agent and the like to optimize continuous coating effect, adopts preferred PVA and preferred two kinds of adhesives to be used in combination, to adhere fillers and paper surfaces, to achieve good film forming and leveling effect of coating, and to obtain good adhesion when printing is heated, so that the carbon tape material is well adhered and firmly adhered, thereby improving the scratch resistance of the coating. DETAILED DESCRIPTION

[0048] In order to better illustrate the purpose, technical scheme and advantages of the present application, the present application will be further described below in combination with specific examples, but the protection scope and implementation mode of the present application are not limited thereto.

[0049] In the following examples, the materials, reagents and the like used are commercially available reagents and materials unless otherwise specified.

[0050] Example 1

[0051] A preparation method of a high-definition carbon tape thermal transfer paper, comprising the following steps:

[0052] (1) Slowly add the precipitated silica powder with a solid content of 20% (precipitated silica powder 20%, water 80%) into water for stirring and dispersion, and add a dispersing agent (the amount of the dispersing agent is 0.1% of the mass of the silica) at the same time for high-speed stirring and dispersion for 30 min, to obtain a precipitated silica dispersion (first filler); the dispersing agent is a polyacrylic acid sodium type dispersing agent (DC-40, Dow Chemical);

[0053] (2) Slowly add the calcined kaolin powder with a solid content of 40% (calcined kaolin powder 40%, water 60%) into water for stirring and dispersion, and add a dispersing agent (the amount of the dispersing agent is 0.1% of the mass of the calcined kaolin) at the same time for high-speed stirring and dispersion for 30 min, to obtain a calcined kaolin dispersion (second filler);

[0054] (3) Slowly add the kaolin powder with a solid content of 50% into water for stirring and dispersion, and add a dispersing agent (the amount of the dispersing agent is 0.1% of the mass of the calcined soil) at the same time for high-speed stirring and dispersion for 30 min, to obtain a kaolin dispersion (other filler);

[0055] (4) Slowly add the polyvinyl alcohol powder with a solid content of 10% into water for stirring, and heat to 95℃ for stirring and cooking for 30 min, to obtain a polyvinyl alcohol cooking liquid (first adhesive);

[0056] (5) Preparation of a multifunctional water-based carbon tape thermal transfer coating:

[0057] S1: In the clear water, 0.2 parts of dispersant, 0.8 parts of water retention agent, 0.5 parts of lubricant, 0.5 parts of fluorescent whitening agent were added while stirring, and mixed and stirred;

[0058] S2: In the mixed solution of step 1, composite fillers including 10 parts of silica dispersion, 60 parts of calcined kaolin dispersion, 0 parts of kaolin dispersion, 5 parts of functional material thermal phase change polymer spherical particles were continuously added, and mixed and stirred for 30 min; the oil absorption value of the precipitated silica was 200, and the D50 particle size was 3um; the oil absorption value of the calcined kaolin was 78, and the D50 particle size was 3um;

[0059] S3: In the mixed solution of S2, adhesive including 3 parts of polyvinyl alcohol cooking liquid, 20 parts of polyether modified polyurethane emulsion (Star, JN-208) was continuously added, and appropriate amount of water was added, mixed and stirred for 30 min, to obtain a multifunctional water-based carbon tape thermal transfer coating with a solid content of 30%;

[0060] (6) The multifunctional water-based carbon tape thermal transfer coating was coated on the smooth surface of the paper base (surface sizing treatment, smooth surface roughness 3.1um) by a doctor blade, and the coating amount was 6g / m 2 , dried in an oven once, dried in an oven equipment twice, and surface high temperature dyeing decoration, and then physically flattened by a calender to obtain a high-definition carbon tape thermal transfer paper.

[0061] Example 2

[0062] A method for preparing a high-definition carbon tape thermal transfer paper, which is different from example 1 in that the composite fillers in step (5) include 25 parts of silica dispersion, 45 parts of calcined kaolin dispersion, 5 parts of functional material thermal phase change polymer spherical particles, and other steps are the same as example 1.

[0063] Example 3

[0064] A method for preparing a high-definition carbon tape thermal transfer paper, which is different from example 1 in that the composite fillers in step (5) include 10 parts of silica dispersion, 55 parts of calcined kaolin dispersion, 5 parts of kaolin dispersion, 5 parts of functional material thermal phase change polymer spherical particles, and other steps are the same as example 1.

[0065] Example 4

[0066] A method for preparing a high-definition carbon tape thermal transfer paper, which is different from example 1 in that the composite fillers in step (5) include 10 parts of silica dispersion, 55 parts of calcined kaolin dispersion, 3 parts of kaolin dispersion, 7 parts of functional material thermal phase change polymer spherical particles, and other steps are the same as example 1.

[0067] Example 5

[0068] A preparation method of high-definition carbon ribbon thermal transfer paper, different from example 1 is that in step (5), the composite filler includes 10 parts of silica dispersion liquid, 55 parts of calcined kaolin dispersion liquid, 5 parts of kaolin dispersion liquid, and 7 parts of functional material thermal phase change polymer spherical particles; the adhesive includes 2.5 parts of polyvinyl alcohol cooking liquid and 18.5 parts of polyether modified polyurethane emulsion, and other steps are the same as example 1.

[0069] Example 6

[0070] A preparation method of high-definition carbon ribbon thermal transfer paper, different from example 1 is that in step (5), the composite filler includes 10 parts of silica dispersion liquid, 55 parts of calcined kaolin dispersion liquid, 3 parts of kaolin dispersion liquid, and 7 parts of functional material thermal phase change polymer spherical particles, the oil absorption value of the precipitated silica is 180, the D50 particle size is 4um, the oil absorption value of the calcined kaolin is 71, the D50 particle size is 4um, and the coating amount of the coating is 8g / m 2 , and other steps are the same as example 1.

[0071] Comparative example 1

[0072] A preparation method of high-definition carbon ribbon thermal transfer paper, different from example 1 is that in step (5), the composite filler does not add precipitated silica dispersion liquid, and other steps are the same as example 1.

[0073] Comparative example 2

[0074] A preparation method of high-definition carbon ribbon thermal transfer paper, different from example 1 is that in step (5), the composite filler does not add calcined kaolin dispersion liquid, and other steps are the same as example 1.

[0075] Comparative example 3

[0076] A preparation method of high-definition carbon ribbon thermal transfer paper, different from example 1 is that in step (5), the same mass of kaolin is used to replace calcined kaolin, and other steps are the same as example 1.

[0077] Comparative example 4

[0078] A preparation method of high-definition carbon ribbon thermal transfer paper, different from example 1 is that in step (5), the oil absorption value of the precipitated silica is 100, the D50 particle size is 4um, and other steps are the same as example 1.

[0079] Comparative example 5

[0080] A preparation method of high-definition carbon ribbon thermal transfer paper, different from example 1 is that the oil absorption value of the precipitated silica in step (5) is 160, the D50 particle size is 5 um, and other steps are the same as example 1.

[0081] Comparative example 6

[0082] A preparation method of high-definition carbon ribbon thermal transfer paper, different from example 1 is that the oil absorption value of the calcined kaolin in step (5) is 60, the D50 particle size is 4 um, and other steps are the same as example 1.

[0083] Comparative example 7

[0084] A preparation method of high-definition carbon ribbon thermal transfer paper, different from example 1 is that the oil absorption value of the calcined kaolin in step (5) is 71, the D50 particle size is 5 um, and other steps are the same as example 1.

[0085] Comparative example 8

[0086] A preparation method of high-definition carbon ribbon thermal transfer paper, different from example 1 is that in step (6), the multifunctional water-based carbon ribbon thermal transfer coating is coated on the smooth surface of the paper base (not surface-sized, smooth surface roughness is 4.2 um) by a doctor blade, and the coating amount is 6 g / m 2 , and other steps are the same as example 1.

[0087] Comparative example 9

[0088] A preparation method of high-definition carbon ribbon thermal transfer paper, different from example 1 is that in step (6), the coating amount is 3 g / m 2 , and other steps are the same as example 1.

[0089] Experiment

[0090] 1. Smoothness: measured using a smoothness tester (GB / T 456-2002-Determination of smoothness of paper and paperboard (Bekk method)). The higher the smoothness, the better the flatness of the paper surface.

[0091] 2. Roughness: measured using a roughness tester (PPS). The lower the roughness, the smoother and flatter the paper surface, which is beneficial to close adhesion with the carbon ribbon film and improvement of transfer clarity.

[0092] 3. Barcode printing level: low energy level, default energy level, and high energy level barcode printing tests were respectively performed using a Toshiba TEC-B-SA4T printer.

[0093] 4. Barcode scanning grade: The barcode grade scanning evaluation was performed using AXICON PC-6500 type barcode detector. The barcode grade results were A-D (A3.1-A4.0, B2.5-B3.0, C1.5-C2.4, D0.5-D1.4) and F0.0. According to the scanning evaluation setting of the instrument, A grade (the higher the score) indicates that the barcode effect is better, D (the lower the score) indicates that the barcode effect is worse, and F grade indicates that it cannot be scanned.

[0094] 5. Rubbing resistance instrument: The mutual scratch resistance test between the printed barcodes was performed using MCJ-01A rubbing resistance tester. After 100 times of mutual back-and-forth scratching, the barcode scanning grade evaluation was performed again.

[0095] 6. Coating powder dropping grade: The test was performed using 3M tape method. The larger the coating area torn off from the coating surface by the 3M tape, the more serious the coating powder dropping, which is not conducive to the improvement of the carbon ribbon transfer clarity.

[0096] The above experimental results are shown in Table 1.

[0097] Table 1

[0098]

[0099] According to Examples 1-6 in Table 1, it can be obtained that the high-definition carbon ribbon thermal transfer paper described in the application has a clarity grade of B3.0 or above after carbon ribbon transfer, and the scanning code grade after scratch resistance of the transferred information is maintained to be B2.5 or above.

[0100] According to Comparative Examples 1-3 in Table 1 compared with Example 1 respectively, it can be obtained that the application of the first filler and the second filler in the application is conducive to improving the scratch resistance effect and the carbon ribbon transfer clarity of the carbon ribbon thermal transfer paper. According to Comparative Examples 4-7 compared with Example 1 respectively, it can be obtained that the control of the particle size and the oil absorption value of the first filler and the second filler in the application is conducive to controlling the flatness, high definition and scratch resistance effect of the carbon ribbon thermal transfer paper. According to Comparative Example 8 compared with Example 1, it can be obtained that the application of the base paper with sizing and a roughness of less than 3.5 um as the paper base of the carbon ribbon thermal transfer paper is conducive to guaranteeing the residence and filling effect of the coating layer on the surface of the paper base during coating processing. After coating with the carbon ribbon thermal transfer paper coating, drying, finishing and polishing, the thermal transfer paper with a smooth and flat surface can be obtained. According to Comparative Example 9 compared with Example 1, it can be obtained that if the coating amount of the coating is too low, the flatness, high definition and scratch resistance effect of the thermal transfer paper are all not as good as those of Example 1, which indicates that the control of the coating amount of the coating in the application to be 5-8 g / m 2 is conducive to improving the printing effect and clarity of the thermal transfer paper.

[0101] Finally, it should be noted that the above examples are merely intended to illustrate the technical solutions of the present application and not to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A high definition carbon ribbon transfer paper, characterized by, The paper base layer and the carbon ribbon thermal transfer printing coating layer, the coating component of the carbon ribbon thermal transfer printing coating layer comprises a composite filler, a binder, a water retaining agent, a lubricant and a dispersant; The composite filler comprises a first filler and a second filler; the oil absorption value of the first filler is 200, and the D50 particle size is 3-4 um; the oil absorption value of the second filler is 78, and the D50 particle size is 3-4 um; The first filler is precipitated silica, and the second filler is calcined kaolin; The composite filler further comprises functional material thermal phase change polymer particles with a D50 particle size less than 1 um; The mass ratio of the first filler to the second filler is 1: (1-8); The amount of the composite filler is 40-77% of the total mass of the components; The amount of the binder is 20-30% of the total mass of the components; The amount of the water retaining agent is 0.5-2% of the total mass of the components; The amount of the lubricant is 0.5-2% of the total mass of the components; The amount of the dispersant is 0.1-0.5% of the total mass of the components; The total mass of each component in the coating component of the carbon ribbon thermal transfer printing coating layer is 100%.

2. The high definition carbon ribbon transfer paper of claim 1, wherein, The composite filler further comprises other fillers, and the other fillers comprise at least one of kaolin, mica powder, bentonite, calcium carbonate, white carbon black and talc powder.

3. The high definition carbon ribbon transfer paper of claim 1, wherein, The binder comprises a first adhesive and a second adhesive, and the mass ratio of the first adhesive to the second adhesive is 1: (3-10).

4. The high definition carbon ribbon transfer paper of claim 3, wherein, At least one of (a)-(d) is included: (a) the first adhesive is polyvinyl alcohol, and the second adhesive comprises at least one of styrene-butadiene latex, nitrile-butadiene latex, chloroprene latex, styrene-acrylate latex, acrylic latex, polyurethane latex, polyester emulsion and epoxy resin emulsion; (b) the dispersant comprises at least one of sodium oleate, carboxylate, sulfate, sulfonate and polyacrylic acid; (c) the water retaining agent comprises at least one of polyacrylic acid polymer, cellulose and sodium alginate; (d) the lubricant comprises at least one of zinc stearate, calcium stearate, paraffin and silicone oil.

5. The high definition carbon ribbon transfer paper of claim 1 wherein, The roughness of the smooth surface of the paper base layer is not higher than 3.5 um.

6. The method for preparing high-definition carbon ribbon thermal transfer paper according to any one of claims 1-5, characterized in that, The method comprises the following steps: (1) dispersing the dispersant in water, and then dispersing the binder, the water retaining agent and the lubricant in the water, adding the composite filler, and mixing uniformly to obtain a coating. (2) The coating is applied on the smooth surface of the paper base, dried, calendered, and high-definition thermal transfer paper is obtained; the coating amount is 5-8 g / m 2 .

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