Full-color erasable thermo-sensitive paper based on high brightness and preparation method of full-color erasable thermo-sensitive paper

Abstract

The invention relates to high-brightness-based full-color erasable thermo-sensitive paper and a preparation method thereof, and relates to the technical field of printing consumables, the thermo-sensitive paper comprises a protective layer, a yellow thermo-sensitive coating, a first intermediate layer, a magenta thermo-sensitive coating, a second intermediate layer and a cyan thermo-sensitive coating which are sequentially arranged from top to bottom; the full-color erasable thermo-sensitive paper provided by the invention is relatively high in color vividness, the color coordinates of the full-color erasable thermo-sensitive paper are only slightly deviated after being repeatedly erased for 100 times, the full-color erasable thermo-sensitive paper can be repeatedly used for multiple times, the problems of serious environmental pollution and resource waste caused by the fact that inkless photographic paper can only be used once in the prior art are solved, and the color printing effect is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of printing consumables, and particularly relates to a thermosensitive paper with high vividness full-color erasability and a preparation method thereof. Background Art

[0002] Ordinary thermosensitive paper generally has three layers. The bottom layer is the paper base layer, the second layer is the thermosensitive coating layer, and the third layer is the film protective layer. Generally, the thermosensitive coating layer contains two substances. One is a colorless dye, also known as a latent dye, which is a colorless or nearly colorless solid and will show color when encountering an acid or an electron acceptor compound. The other is a developer. Under the condition of heating, the colorless dye and the developer will have a color reaction to achieve information recording.

[0003] At present, the erasable information storage certificates based on ID cards have achieved thermosensitive erasability, but their colors are single, and the erasability resistance still needs to be improved. After being erased 20 times by a thermal laminator, obvious imprints appear on the surface. Especially for its photocuring protective layer, it cannot be folded, which limits its application on ordinary paper and is difficult to meet the requirements of full-color photo paper. And the inkless photo paper prepared by the current technology can only be used once. These thermosensitive papers used to record text information or images will be treated as garbage or waste when they are useless, which will cause huge waste of resources and environmental pollution. Therefore, it is of great significance to develop erasable full-color photo paper.

[0004] At present, the color hue of the inkless printing photo paper of Zink company is relatively dark after printing, and excellent printing effects cannot be achieved. There is relatively little research on the development of full-color erasable thermosensitive photo paper. Because the melting points of yellow, magenta, and cyan thermosensitive dyes are close, it is difficult to achieve color overlay. In view of this, the present invention provides a thermosensitive paper with high vividness full-color erasability and a preparation method thereof. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a thermosensitive paper with high vividness full-color erasability and a preparation method thereof. The full-color erasable thermosensitive paper provided by the present invention has relatively high vividness. After being erased 100 times repeatedly, its color coordinates only have a slight deviation, and it can be used repeatedly, solving the serious environmental pollution and resource waste problems caused by the fact that the inkless photo paper in the prior art can only be used once, and greatly improving the color printing effect.

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

[0007] In a first aspect, a thermosensitive paper with high vividness full-color erasability, the thermosensitive paper includes a protective layer, a yellow thermosensitive coating layer, a first intermediate layer, a magenta thermosensitive coating layer, a second intermediate layer, and a cyan thermosensitive coating layer which are sequentially arranged from top to bottom;

[0008] The protective layer comprises the following raw materials in parts by weight: 10-50 parts of heat conduction auxiliary agent A, 1-10 parts of ultraviolet resistance auxiliary agent, 1-5 parts of lubricant, 30-80 parts of adhesive A, and 40-60 parts of curing agent A;

[0009] The yellow thermosensitive coating comprises the following raw materials in parts by weight: 10-45 parts of yellow developer, 2-15 parts of yellow thermosensitive dye, 30-50 parts of adhesive B, 20-30 parts of curing agent B, and 1-20 parts of heat conduction auxiliary agent B;

[0010] The first intermediate layer comprises the following raw materials in parts by weight: 10-50 parts of heat insulation auxiliary agent C, 30-80 parts of adhesive C, and 40-60 parts of curing agent C;

[0011] The magenta thermosensitive coating comprises the following raw materials in parts by weight: 10-45 parts of magenta developer, 2-15 parts of magenta thermosensitive dye, 30-50 parts of adhesive D, 20-30 parts of curing agent D, 1-20 parts of heat conduction auxiliary agent D, and 2-15 parts of temperature adjustment auxiliary agent D;

[0012] The second intermediate layer comprises the following raw materials in parts by weight: 10-50 parts of heat insulation auxiliary agent E, 30-80 parts of adhesive E, and 40-60 parts of curing agent E;

[0013] The cyan thermosensitive coating comprises the following raw materials in parts by weight: 10-45 parts of cyan developer, 2-15 parts of cyan thermosensitive dye, 30-50 parts of adhesive F, 20-30 parts of curing agent F, 1-20 parts of heat conduction auxiliary agent F, and 2-15 parts of temperature adjustment auxiliary agent F.

[0014] The beneficial effects of the present invention are as follows: by adding a temperature adjustment auxiliary agent, the present invention adjusts the color development temperature of the magenta thermosensitive coating and the cyan thermosensitive coating to medium and low. Yellow single-color printing is achieved by short-term high-temperature heating, magenta single-color printing is achieved by short-term medium-temperature heating, cyan single-color printing is achieved by low-temperature heating, and full-color printing can be achieved by superimposing three colors; on this basis, by using a combination of various color development dyes, a printing effect with more vivid colors is obtained; the intermediate layer plays a role in preventing leakage and heat insulation.

[0015] Further, two or more color development dyes are used for the yellow thermosensitive dye, the magenta thermosensitive dye, and the cyan thermosensitive dye.

[0016] The beneficial effect of adopting the above further scheme is that: under the condition of heat, each dye and the corresponding developer are mixed to produce a color development reaction. By using a combination of two or more dyes in each layer, color printing with higher color density is achieved, and various colors with higher color density and distinctness can be stacked.

[0017] Further, in the protective layer, the thermal conductivity promoter A includes at least one of ZnO, MgO, and Al2O3;

[0018] The ultraviolet resistance promoter includes at least one of salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, and triazines;

[0019] The lubricant includes at least one of zinc stearate, mineral lubricant, silicone oil, fatty acid amide, oleic acid, polyester, synthetic ester, and carboxylic acid;

[0020] The adhesive A includes at least one of polyvinyl alcohol (PVA), polyacrylate, and polyurethane;

[0021] The curing agent A includes at least one of polyamide, diethylenetriamine, and polyisocyanate.

[0022] The beneficial effect of adopting the above further solution is that the protective layer ensures the thermal conductivity effect and reduces the cost at the same time.

[0023] Further, in the yellow thermosensitive coating, the yellow color former includes p = 12 - 37;

[0024] The yellow thermosensitive dye includes

[0025] The adhesive B includes at least one of epoxy resin, polyurethane, and acrylate;

[0026] The curing agent B includes at least one of polyamide, diethylenetriamine, and polyisocyanate;

[0027] The thermal conductivity promoter B includes at least one of ZnO, MgO, and Al2O3.

[0028] The beneficial effect of adopting the above further solution is that it can achieve yellow with a relatively high color density and avoid the insufficient yellow color density in the current thermosensitive paper.

[0029] Further, in the first intermediate layer, the heat insulation promoter C includes at least one of ZnO, glass fiber, montmorillonite, Al2O3, rare earth heat resistant agent, porous silica, porous alumina, porous titanium dioxide, and porous carbon;

[0030] The adhesive C includes at least one of epoxy resin, epoxy acrylate, organosilicon acrylate, and acrylic resin;

[0031] The curing agent C includes at least one of polyamide, diethylenetriamine, and polyisocyanate.

[0032] The beneficial effects of adopting the above further scheme are as follows: it plays a heat insulation role and prevents the magenta thermosensitive coating from developing color when printing yellow at high temperature.

[0033] Further, in the magenta thermosensitive coating, the magenta color former includes p = 12 - 37;

[0034] The magenta thermosensitive dye includes at least two of;

[0035] The adhesive D includes at least one of epoxy resin, polyurethane, and acrylate;

[0036] The curing agent D includes at least one of polyamide, diethylenetriamine, and polyisocyanate;

[0037] The heat conduction aid D includes at least one of ZnO, MgO, and Al2O3;

[0038] The temperature adjustment aid D includes at least one of naphthylurea compounds, naphthylamide compounds, naphthyl ester compounds, and naphthyl amino acid ester compounds.

[0039] The beneficial effects of adopting the above further scheme are as follows: it can achieve a magenta with a relatively high color density and avoid the insufficient magenta color density in the current thermosensitive paper.

[0040] Further, in the second intermediate layer, the heat insulation aid E includes at least one of ZnO, glass fiber, montmorillonite, Al2O3, rare earth heat resistant agent, porous silica, porous alumina, porous titanium dioxide, and porous carbon;

[0041] The adhesive E includes at least one of epoxy resin, epoxy acrylate, silicone acrylate, and acrylic resin (PVA, polyacrylate, and polyurethane);

[0042] The curing agent E includes at least one of polyamide, diethylenetriamine, and polyisocyanate.

[0043] The beneficial effects of adopting the above further scheme are as follows: it plays a heat insulation role and prevents the cyan thermosensitive coating from developing color when printing magenta at high temperature.

[0044] Further, in the cyan thermosensitive coating, the cyan color former includes p = 12 - 37;

[0045] The cyan thermosensitive dye includes at least two of;

[0046] The adhesive F includes at least one of epoxy resin, polyurethane, and acrylate;

[0047] The curing agent F includes at least one of polyamide, diethylenetriamine, and polyisocyanate;

[0048] The heat-conducting aid F includes at least one of ZnO, MgO, and Al2O3;

[0049] The temperature-regulating aid F includes at least one of naphthylurea compounds, naphthylamide compounds, naphthyl ester compounds, and naphthyl amino acid ester compounds.

[0050] The beneficial effect of adopting the above further scheme is that it can achieve a higher color density of cyan and avoid the insufficient cyan color density in the current thermal paper.

[0051] In the first intermediate layer and the second intermediate layer, the adhesive resin includes at least one of PVA, polyacrylate, and polyurethane.

[0052] Further, the thickness of the protective layer is 1 - 3 μm, the thickness of the yellow thermal coating is 5 - 8 μm, the thickness of the first intermediate layer is 2 - 6 μm, the thickness of the magenta thermal coating is 6 - 10 μm, the thickness of the second intermediate layer is 2 - 6 μm, and the thickness of the cyan thermal coating is 8 - 14 μm.

[0053] Further, the thermal paper further includes a base material layer, and the base material layer includes at least one of coated paper, white cardboard, kraft paper, double-sided coated paper, glassine paper, stone paper, and PVC cardboard;

[0054] The thickness of the base material layer is 100 - 140 μm.

[0055] In a second aspect, a high-colorfulness full-color erasable thermal paper includes the following steps:

[0056] S1: Preparation of solutions: Prepare coating solutions for the protective layer, yellow thermal coating, first intermediate layer, magenta thermal coating, second intermediate layer, and cyan thermal coating respectively to obtain the coating solution for the protective layer, the coating solution for the yellow thermal coating, the coating solution for the first intermediate layer, the coating solution for the magenta thermal coating, the coating solution for the second intermediate layer, and the coating solution for the cyan thermal coating;

[0057] S2: Coating: Coat the coating solution of the cyan thermosensitive coating on one side of the substrate layer, and then dry it to form the cyan thermosensitive coating; coat the second intermediate layer on the cyan thermosensitive coating and dry it to form the second intermediate layer; coat the coating solution of the magenta thermosensitive coating on the second intermediate layer and dry it to form the magenta thermosensitive coating; coat the coating solution of the first intermediate layer on the magenta thermosensitive coating and dry it to form the first intermediate layer; coat the coating solution of the yellow thermosensitive coating on the first intermediate layer and dry it to form the yellow thermosensitive coating; coat the coating solution of the protective layer on the yellow thermosensitive coating and dry it to form the protective layer;

[0058] S3: Laminating: Laminate the substrate layer, the cyan thermosensitive coating, the second intermediate layer, the magenta thermosensitive coating, the first intermediate layer, the yellow thermosensitive coating, and the protective layer to obtain a thermosensitive paper based on highly vivid full-color erasable writing.

[0059] The beneficial effects of the present invention are as follows: The color thermosensitive erasable paper prepared by the preparation method of the present invention can display yellow, magenta, and cyan, and can display full-color printing through the superposition of the three colors, and can be erased and rewritten multiple times. Description of the Drawings

[0060] Figure 1 It is a schematic diagram of the color erasable thermosensitive paper of the present invention. Detailed Embodiments

[0061] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention. For those not specifying specific techniques or conditions in the examples, the techniques or conditions described in the literature in the field or according to the product specifications are followed. For reagents or instruments not indicating the manufacturer, they are all conventional products that can be purchased through regular channels.

[0062] Description of the sources of materials and reagents:

[0063] The raw materials used in the embodiments of the present invention are all commercial raw materials except for the color developer and the temperature adjustment aid. The temperature adjustment aid is independently designed in the laboratory.

[0064] (1) The synthesis route of the color developer is as follows: Octadecyl isocyanate and p-aminophenol are added to a beaker containing toluene, and the reaction is carried out in a water bath at 60 °C until it cannot be stirred anymore. After filtration, recrystallization, and drying, the color developer is obtained.

[0065] (2) The synthesis method of the temperature adjustment aid: Octadecyl isocyanate and aminophenol are added to a beaker containing 100 mL of toluene, and the reaction is carried out in a water bath at 60 °C until it cannot be stirred anymore. After filtration, recrystallization, and drying, the temperature adjustment aid is obtained.

[0066] Example 1:

[0067] This embodiment relates to a color erasable thermal paper based on multi-color multi-layer superposition. The color erasable thermal paper includes a protective layer, a yellow thermal coating, a first intermediate layer, a magenta thermal coating, a second intermediate layer, a cyan thermal coating, and a substrate layer arranged in sequence from top to bottom. Figure 1 )

[0068] The protective layer includes the following specific components by weight: 40 parts of zinc oxide, 5 parts of ultraviolet-resistant auxiliary benzotriazole, 3 parts of lubricant talcum powder, 75 parts of adhesive epoxy resin, 50 parts of curing agent, and the thickness is controlled at 3 um.

[0069] The yellow thermal coating includes the following specific components by weight: 36 parts of yellow developer, 5 parts of first yellow thermal dye, 4 parts of second yellow thermal dye, 30 parts of adhesive epoxy resin, 30 parts of polyamide curing agent, and 6 parts of magnesium oxide heat conduction auxiliary, and the thickness is controlled at 6 um; the first yellow thermal dye is The second yellow thermal dye is The developer is where P = 12 - 37;

[0070] The magenta thermal coating includes the following specific components by weight: 24 parts of developer, 4 parts of first thermal red dye, 2 parts of second thermal red dye, 30 parts of adhesive epoxy resin, 30 parts of polyamide curing agent, 6 parts of temperature adjustment auxiliary naphthyl octadecyl ester, and 6 parts of magnesium oxide heat conduction auxiliary, and the thickness is controlled at 6 um; the first thermal red dye is The second thermal red dye is The developer is where P = 12 - 37;

[0071] The cyan thermal coating includes the following specific components by weight: 36 parts of cyan developer, 6 parts of first cyan thermal dye, 3 parts of second cyan thermal dye, 30 parts of epoxy resin adhesive, 30 parts of polyamide curing agent, 9 parts of temperature adjustment auxiliary octadecyl urea-based phenol, and 6 parts of magnesium oxide heat conduction auxiliary, and the thickness is controlled at 8 um; the first cyan thermal dye is The second cyan thermal dye is The developer is where P = 12 - 37;

[0072] The intermediate layer includes the following specific components by weight: 40 parts of zinc oxide, 75 parts of adhesive epoxy resin, 50 parts of curing agent, and the thickness is controlled at 3 um.

[0073] A preparation method of a thermal paper based on highly vivid full-color erasable according to this embodiment includes the following steps:

[0074] S1: Prepare coating liquids for the cyan thermosensitive coating from its respective components; prepare coating liquids for the magenta thermosensitive coating from its respective components; prepare coating liquids for the yellow thermosensitive coating from its respective components; prepare coating liquid for the intermediate layer from its respective components; successively coat the coating liquid of the cyan thermosensitive coating, the intermediate layer coating liquid, the coating liquid of the magenta thermosensitive coating, the intermediate layer coating liquid, and the coating liquid of the yellow thermosensitive coating on a substrate, and then dry it to obtain a thermosensitive coating;

[0075] S2: Prepare coating liquid for the protective layer from its respective components, coat it on the thermosensitive coating, and then dry it to obtain a protective layer;

[0076] S3: Composite the substrate, the thermosensitive coating, and the protective layer through a hot pressing process to obtain a color thermosensitive erasable paper based on a multi-color multi-layer superposition of a color erasable thermosensitive paper.

[0077] Example 2:

[0078] This example relates to a thermosensitive paper based on highly vivid full-color erasable, with a protective layer, a yellow thermosensitive coating, a first intermediate layer, a magenta thermosensitive layer, a second intermediate layer, a cyan thermosensitive coating, and a substrate layer arranged from top to bottom ( Figure 1 );

[0079] The protective layer includes the following specific components by weight: 40 parts of zinc oxide, 5 parts of ultraviolet-resistant auxiliary benzotriazole, 3 parts of solid lubricant talc powder, 75 parts of epoxy resin adhesive resin, 50 parts of curing agent, and the thickness is controlled at 3um;

[0080] The yellow thermosensitive coating includes the following specific components by weight: 36 parts of yellow developer, 9 parts of yellow thermosensitive dye, 30 parts of epoxy resin adhesive, 30 parts of polyamide curing agent, and 6 parts of magnesium oxide filler, and the thickness is controlled at 6um; the developer is where P = 12 - 37;

[0081] The magenta thermosensitive coating includes the following specific components by weight: 24 parts of magenta developer, 6 parts of thermosensitive dye (pink), 30 parts of epoxy resin adhesive, 30 parts of polyamide curing agent, 6 parts of temperature adjustment auxiliary, and 6 parts of magnesium oxide filler, and the thickness is controlled at 6um; the developer is where P = 12 - 37;

[0082] The cyan thermosensitive coating includes the following specific components by weight: 36 parts of developer, 9 parts of cyan thermosensitive dye, 30 parts of epoxy resin adhesive, 30 parts of polyamide curing agent, 9 parts of temperature adjustment auxiliary, and 6 parts of magnesium oxide filler, and the thickness is controlled at 8um; the developer is where P = 12 - 37;

[0083] The preparation method of the color thermosensitive erasable paper of the color erasable thermosensitive paper based on multi-color multi-layer superposition involved in this embodiment includes the following steps:

[0084] S1: Prepare the coating liquid of the cyan thermosensitive coating from the components of the cyan thermosensitive coating; prepare the coating liquid of the magenta thermosensitive coating from the components of the magenta thermosensitive coating; prepare the coating liquid of the yellow thermosensitive coating from the components of the yellow thermosensitive coating; prepare the coating liquid of the intermediate layer from the components of the intermediate layer; successively coat the coating liquid of the cyan thermosensitive coating, the intermediate layer coating liquid, the coating liquid of the magenta thermosensitive coating, the intermediate layer coating liquid, and the coating liquid of the yellow thermosensitive coating on the substrate, and dry to obtain the thermosensitive coating;

[0085] S2: Prepare the coating liquid of the protective layer from the components of the protective layer, coat it on the thermosensitive coating, and dry to obtain the protective layer;

[0086] S3: Compose the substrate, the thermosensitive coating, and the protective layer through a hot pressing process to obtain the color erasable thermosensitive paper of the color erasable thermosensitive paper based on multi-color multi-layer superposition.

[0087] Comparative Example 1:

[0088] Compared with Example 1, except that the protective layer is not provided, the rest is the same as in Example 1.

[0089] Comparative Example 2:

[0090] On the basis of Example 1, except that there are 8 parts of the developer, 1 part of the first yellow thermosensitive dye, and 1 part of the second yellow thermosensitive dye in the yellow thermosensitive coating, the rest is the same.

[0091] Comparative Example 3:

[0092] On the basis of Example 2, zinc oxide, the heat conduction assistant, is not added to the protective layer, and the rest is the same.

[0093] Comparative Example 4:

[0094] On the basis of Comparative Example 1, the thickness of the cyan coating is reduced from 8 μm to 2 μm, and the rest is the same.

[0095] Test Example:

[0096] (1) Printing method: Use a CV80 printer to print yellow, magenta, and cyan, and test the color density.

[0097] (2) Erasing method: At 140 °C and a pressure of 1 kgf / cm 2 , use a thermal imager to heat the image for 1 second to erase it. If the retention rate is lower than 10%, it indicates that the reversibility is successful once.

[0098] (3) Erasure efficiency: (Color density after erasure - Base color density) / (Printing color density - Base color density) * 100%.

[0099] Table 1 Performance comparison between Example 1 and Comparative Example 2

[0100]

[0101]

[0102] It can be seen from Table 1 that reducing the dosages of the yellow layer developer and dye will reduce the color density of yellow.

[0103] Table 2 Performance comparison between Example 2 and Comparative Example 3

[0104]

[0105] It can be seen from Table 2 that not adding a heat conduction aid in the protective layer will reduce the color density of each color, and it can be seen from the comparison between Example 2 and Example 1 that using a blend of two dyes can effectively improve the color density of each color.

[0106] Table 3 Performance comparison between Comparative Example 1 and Comparative Example 4

[0107]

[0108] It can be seen from Table 3 that without the protective layer, the yellow color density drops significantly after 100 times of erasing and writing, and reducing the thickness of the cyan color developing layer will reduce the cyan color density.

[0109] In summary, it can be known that through the cooperation of the protective layer, the intermediate layer and the thermal sensitive coatings (yellow thermal sensitive coating, magenta thermal sensitive coating and cyan thermal sensitive coating), the present invention can achieve the color development of three colors, and through the blending and matching of thermal sensitive dyes, highly vivid erasable full-color superposition can be carried out.

[0110] 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 thermosensitive paper based on high vivid full-color erasable, characterized in that, The thermal paper includes a protective layer, a yellow thermal coating, a first intermediate layer, a magenta thermal coating, a second intermediate layer, and a cyan thermal coating, which are sequentially arranged from top to bottom; The protective layer includes the following raw materials in parts by weight: 10-50 parts of heat conduction aid A, 1-10 parts of ultraviolet resistance aid, 1-5 parts of lubricant, 30-80 parts of adhesive A, and 40-60 parts of curing agent A; The yellow thermal coating includes the following raw materials in parts by weight: 10-45 parts of yellow developer, 2-15 parts of yellow thermal dye, 30-50 parts of adhesive B, 20-30 parts of curing agent B, and 1-20 parts of heat conduction aid B; The first intermediate layer includes the following raw materials in parts by weight: 10-50 parts of heat insulation aid C, 30-80 parts of adhesive C, and 40-60 parts of curing agent C; The magenta thermal coating includes the following raw materials in parts by weight: 10-45 parts of magenta developer, 2-15 parts of magenta thermal dye, 30-50 parts of adhesive D, 20-30 parts of curing agent D, 1-20 parts of heat conduction aid D, and 2-15 parts of temperature adjustment aid D; The second intermediate layer includes the following raw materials in parts by weight: 10-50 parts of heat insulation aid E, 30-80 parts of adhesive E, and 40-60 parts of curing agent E; The cyan thermal coating includes the following raw materials in parts by weight: 10-45 parts of cyan developer, 2-15 parts of cyan thermal dye, 30-50 parts of adhesive F, 20-30 parts of curing agent F, 1-20 parts of heat conduction aid F, and 2-15 parts of temperature adjustment aid F.

2. The thermosensitive paper based on high vividness full-color erasable according to claim 1, wherein, In the protective layer, the heat conduction aid A includes at least one of ZnO, MgO, and Al2O3; The ultraviolet resistance aid includes at least one of salicylate esters, benzophenones, benzotriazoles, substituted acrylonitriles, and triazines; The lubricant includes at least one of zinc stearate, mineral lubricants, silicone oil, fatty acid amides, oleic acid, polyesters, synthetic esters, and carboxylic acids; The adhesive A includes at least one of polyvinyl alcohol, polyacrylate, and polyurethane; The curing agent A includes at least one of polyamides, diethylenetriamine, and polyisocyanates.

3. The thermosensitive paper based on high vividness full-color erasable according to claim 1, characterized in that In the yellow thermosensitive coating, the yellow developer includes p = 12 - 37; The yellow thermosensitive dye includes The adhesive B includes at least one of epoxy resins, polyurethanes, and acrylates; The curing agent B includes at least one of polyamides, diethylenetriamine, and polyisocyanates; The heat conduction aid B includes at least one of ZnO, MgO, and Al2O3.

4. The thermosensitive paper based on highly vivid full-color erasable according to claim 1, wherein In the first intermediate layer, the heat insulation aid C includes at least one of ZnO, glass fiber, montmorillonite, Al2O3, rare earth heat resistant agents, porous silica, porous alumina, porous titanium dioxide, and porous carbon; The adhesive C includes at least one of epoxy resins, epoxy acrylates, silicone acrylates, and acrylic resins; The curing agent C includes at least one of polyamides, diethylenetriamine, and polyisocyanates.

5. A thermosensitive paper based on high vivid full-color erasable according to claim 1, characterized in that, In the magenta thermal coating, the magenta color former includes p = 12 - 37; The magenta thermosensitive dye includes at least two of; The adhesive D includes at least one of epoxy resins, polyurethanes, and acrylates; The curing agent D includes at least one of polyamides, diethylenetriamine, and polyisocyanates; The heat conduction aid D includes at least one of ZnO, MgO, and Al2O3; The temperature-regulating auxiliary D includes at least one of naphthylurea compounds, naphthylamide compounds, naphthyl ester compounds, and naphthyl amino acid ester compounds.

6. A thermosensitive paper based on highly vivid full-color erasable according to claim 1, characterized in that, In the second intermediate layer, the heat-insulating auxiliary E includes at least one of ZnO, glass fiber, montmorillonite, Al2O3, rare earth heat-resistant agent, porous silica, porous alumina, porous titanium dioxide, and porous carbon; The adhesive E includes at least one of epoxy resin, epoxy acrylate, silicone acrylate, and acrylic resin; The curing agent E includes at least one of polyamide, diethylenetriamine, and polyisocyanate.

7. The thermosensitive paper based on high vividness full-color erasable according to claim 1, wherein In the cyan thermosensitive coating, the cyan developer includes p = 12 - 37; The cyan thermosensitive dye includes at least two of; The adhesive F includes at least one of epoxy resin, polyurethane, and acrylate; The curing agent F includes at least one of polyamide, diethylenetriamine, and polyisocyanate; The heat-conducting auxiliary F includes at least one of ZnO, MgO, and Al2O3; The temperature-regulating auxiliary F includes at least one of naphthylurea compounds, naphthylamide compounds, naphthyl ester compounds, and naphthyl amino acid ester compounds.

8. A thermosensitive paper based on high vivid full-color erasable according to any one of claims 1 to 7, characterized in that The thickness of the protective layer is 1 - 3 μm, the thickness of the yellow thermosensitive coating is 5 - 8 μm, the thickness of the first intermediate layer is 2 - 6 μm, the thickness of the magenta thermosensitive coating is 6 - 10 μm, the thickness of the second intermediate layer is 2 - 6 μm, and the thickness of the cyan thermosensitive coating is 8 - 14 μm.

9. A thermosensitive paper based on highly vivid full-color erasable, according to any one of claims 1 to 7, characterized in that, The thermosensitive paper further includes a base material layer, and the base material layer includes at least one of coated paper, white cardboard, kraft paper, double-sided coated paper, glassine paper, stone paper, and PVC cardboard; The thickness of the base material layer is 100 - 140 μm.

10. The thermosensitive paper based on high vivid full-color erasable according to any one of claims 1 to 9, characterized in that, It includes the following steps: S1: Solution preparation: Prepare coating solutions for the protective layer, yellow thermosensitive coating, first intermediate layer, magenta thermosensitive coating, second intermediate layer, and cyan thermosensitive coating respectively, to obtain the coating solution for the protective layer, the coating solution for the yellow thermosensitive coating, the coating solution for the first intermediate layer, the coating solution for the magenta thermosensitive coating, the coating solution for the second intermediate layer, and the coating solution for the cyan thermosensitive coating; S2: Coating: Coat the coating solution of the cyan thermosensitive coating on one side of the base material layer, and then dry it to form the cyan thermosensitive coating; Coat the second intermediate layer on the cyan thermosensitive coating and dry it to form the second intermediate layer; Coat the coating solution of the magenta thermosensitive coating on the second intermediate layer and dry it to form the magenta thermosensitive coating; Coat the coating solution of the first intermediate layer on the magenta thermosensitive coating and dry it to form the first intermediate layer; Coat the coating solution of the yellow thermosensitive coating on the first intermediate layer and dry it to form the yellow thermosensitive coating; Coat the coating solution of the protective layer on the yellow thermosensitive coating and dry it to form the protective layer; S3: Lamination: Laminating the base material layer, the cyan thermosensitive coating, the second intermediate layer, the magenta thermosensitive coating, the first intermediate layer, the yellow thermosensitive coating, and the protective layer to obtain the high-colorfulness full-color erasable thermosensitive paper.

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