An ultra-high weather-resistant OC protective carbon tape and its preparation method

Abstract

The present invention relates to an ultra-high weather-resistant OC protective carbon ribbon and a preparation method thereof, and relates to the field of thermal transfer technology. The OC protective carbon ribbon of the present invention comprises an adhesive layer, a curing layer, a peeling layer, a substrate, and a back coating layer, which are sequentially arranged from top to bottom; the peeling layer comprises the following raw materials in parts by weight: 19-22 parts of a second resin, 0.5-0.7 parts of a release agent, 1.8-2.2 parts of a solid lubricant, 0.9-1.2 parts of a dispersant, 26-32 parts of a light stabilizer, 0.3-0.6 parts of an antioxidant, and 0.5-0.8 parts of an antistatic agent; the curing layer comprises the following raw materials in parts by weight: 18-22 parts of a third resin, 2-4 parts of an isocyanate curing agent, and 19-22 parts of a reactive light stabilizer; and the adhesive layer comprises the following raw materials in parts by weight: 8-12 parts of a fourth resin, 2-4 parts of an auxiliary agent, and 0.8-1.1 parts of a dispersant. The OC protective ribbon obtained by the present invention can maintain good foil retention during high-speed printing while also achieving high weather resistance, high alcohol resistance, and high gloss. It can be applied to various scenarios, thus expanding the scope of use and adaptability of thermal transfer ribbons.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal transfer printing, and in particular to an ultra-high weather resistance OC protective carbon tape and a preparation method thereof. Background Art

[0002] In response to the special demand for high weather resistance, high alcohol resistance, high gloss and foil retention performance of carbon ribbons under high-speed printing of soft labels, there are many problems with the protective films currently on the market: First, thermal sublimation ribbons use small molecule dyes. The dyes absorb light energy, the energy level increases, the molecules are in an excited state, the color system of the dye molecules changes or is destroyed, resulting in dye decomposition and discoloration or fading. Therefore, a high weather resistance protective layer needs to be set on the pattern surface, but most carbon ribbons on the market have poor weather resistance and alcohol friction resistance due to the migration of resins and additives, and cannot take both into account at the same time; second, under high-speed printing conditions, the heating and pressurizing method of the print head leads to insufficient foil retention performance of the single-layer carbon ribbon, affecting the continuous printing and quality of the finished product; third, under high-speed printing conditions, the heating and pressurizing method of the print head requires the carbon ribbon protective layer to have good demolding properties, otherwise it will affect the gloss of the thermal sublimation pattern surface.

[0003] Therefore, it is urgently needed to provide a thermal transfer carbon ribbon that can simultaneously take into account high weather resistance, high alcohol resistance, high gloss and foil retention performance of the carbon ribbon under high-speed printing of soft labels. Summary of the Invention

[0004] To address the above-mentioned technical issues, the present invention provides an ultra-highly weather-resistant OC protective ribbon and a method for its preparation. The OC protective ribbon prepared by the present invention comprises a back coating layer on one side of the substrate and an OC protective layer (comprising a release layer, a curing layer, and an adhesive layer) on the other side. The resulting OC protective ribbon exhibits excellent foil retention during high-speed printing while also achieving high weather resistance, high alcohol resistance, and high gloss. This allows for diverse applications, broadening the range of applications and adaptability of thermal transfer ribbons.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] The first object of the present invention is to provide an ultra-high weather-resistant OC protective carbon tape, comprising an adhesive layer, a curing layer, a peeling layer, a substrate, and a back coating layer arranged in sequence from top to bottom;

[0007] The peeling layer comprises the following raw materials in parts by weight: 19-22 parts of a second resin, 0.5-0.7 parts of a release agent, 1.8-2.2 parts of a solid lubricant, 0.9-1.2 parts of a dispersant, 26-32 parts of a light stabilizer, 0.3-0.6 parts of an antioxidant, and 0.5-0.8 parts of an antistatic agent;

[0008] The curing layer comprises the following raw materials in parts by weight: 18-22 parts of a third resin, 2-4 parts of an isocyanate curing agent, and 19-22 parts of a reactive light stabilizer;

[0009] The adhesive layer comprises the following raw materials in parts by weight: 8-12 parts of a fourth resin, 2-4 parts of an auxiliary agent, and 0.8-1.1 parts of a dispersant.

[0010] The present invention has the following beneficial effects: The protective carbon ribbon comprises a substrate having a back coating layer on one side and an OC protective layer (comprising a release layer, a curing layer, and an adhesive layer) on the other side. By adjusting the composition and structure of the carbon ribbon, employing a multi-layered structure and employing different combinations of additives, the present invention not only simultaneously addresses various performance characteristics but also allows for application in diverse scenarios, thereby expanding the ribbon's range of uses and adaptability. The protective carbon ribbon produced by the present invention exhibits excellent foil retention during high-speed printing, while also achieving high weather resistance, high alcohol resistance, and high gloss, making it well-suited for high-speed soft label printing.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the back coating layer comprises the following raw materials in parts by weight: 9-11 parts of a first resin, 2-4 parts of an isocyanate curing agent, 0.5-1 part of an inorganic filler, 0.5-0.9 parts of a release agent, and 0.3-0.5 parts of an organic silicone oil;

[0013] The first resin is a thermoplastic resin;

[0014] The isocyanate curing agent in the back coating layer includes at least one of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, and aromatic isocyanate;

[0015] The inorganic filler includes at least one of talc, kaolin, calcium carbonate, aluminum hydroxide, silicon dioxide, graphite, and boron nitride;

[0016] The release agent in the back coating layer includes at least one of phosphate ester, metal soap, silicone oil, and surfactant.

[0017] The beneficial effects of adopting this further solution are as follows: the back coating layer provides smoothness at different printing temperatures, preventing adverse effects such as lateral wrinkling and stickiness during printing. It also cleans and protects the print head and ensures uniform heat transfer, resulting in improved glossiness, reduced surface roughness, and enhanced wear resistance of the protective layer after transfer. To enhance the back coating layer's heat resistance during printing, improve adhesion between the back coating layer and PET, and reduce viscosity at high temperatures, an isocyanate curing agent can be added to the aforementioned resin. Inorganic fillers and release agents are also required to maintain the ribbon's excellent smoothness during high-speed printing.

[0018] Preferably, the first resin includes at least one of polyester resin, polyacrylate resin, polyvinyl acetate resin, styrene acrylate resin, polyurethane resin, polyethylene resin, polypropylene resin, polystyrene resin, polyvinyl chloride resin, polyether resin, polyamide resin, polyimide resin, polyamideimide resin, polycarbonate resin, polyacrylamide resin, polyvinyl chloride resin, polyvinyl butyral resin, polyvinyl acetal resin, and polyvinyl acetal resin;

[0019] Preferably, the first resin further comprises a silicone modified product of the above resin.

[0020] Preferably, the first resin is polyvinyl butyral resin.

[0021] Preferably, the aromatic isocyanate includes, but is not limited to, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, toluidine diisocyanate, and p-phenylene diisocyanate.

[0022] Preferably, the inorganic filler is talc powder with a mesh size of 5000-11000.

[0023] Preferably, the release agent is a phosphate ester.

[0024] Preferably, the inorganic filler has a D50 particle size of 1.0-5 μm and a D90 particle size of 3-10 μm.

[0025] The beneficial effects of adopting the above scheme are: in order to ensure that the inorganic filler is evenly dispersed in the resin, improve the good thermal conductivity of the back coating, improve the gloss after transfer, reduce the surface roughness, and improve the wear resistance, it is necessary to control the overall particle size and particle size distribution of the back coating filler. If the requirements cannot be met, grinding treatment is required.

[0026] Furthermore, the second resin includes at least one of acrylonitrile-butadiene-styrene copolymer resin, polystyrene resin, polycarbonate resin, polymethyl methacrylate resin, and polyacrylic acid resin;

[0027] The release agent in the peeling layer is at least one of a solid release agent and a liquid release agent;

[0028] The solid lubricant includes at least one of talc powder, wax powder, and metal soap;

[0029] The dispersant in the peeling layer includes at least one of a cationic wetting dispersant, an anionic wetting dispersant, a nonionic wetting dispersant, an amphoteric wetting dispersant, and a polymeric hyperdispersant;

[0030] The light stabilizer in the release layer includes at least one of a light shielding agent, an ultraviolet absorber, a quencher, a free radical scavenger, and a hydroperoxide decomposer;

[0031] The antioxidant includes at least one of hindered phenol antioxidants, phosphite antioxidants, thio antioxidants, composite antioxidants, and hindered amine antioxidants;

[0032] The antistatic agent includes at least one of sulfuric acid derivatives, phosphoric acid derivatives, amines, quaternary ammonium salts, imidazoles, and ethylene oxide derivatives.

[0033] The beneficial effects of adopting the above further scheme are: the role of the peeling layer in the present invention is to ensure that the peeling layer can be smoothly demolded during printing; secondly, to provide glossiness on the pattern surface after printing is completed; thirdly, to provide UV protection in indoor environments and extend the storage life of the finished product; and fourthly, to provide a certain degree of alcohol friction resistance protection.

[0034] The peeling layer uses a high-gloss resin to ensure that the pattern surface of the peeling layer has good gloss after printing. To further improve the gloss of the peeling layer, a certain amount of mold release agent is added to the peeling layer. In addition, a solid lubricant is added to improve the wear resistance of the peeling layer. To ensure that the time and energy required to complete the dispersion process during powder grinding are reduced, a certain amount of dispersant is added. A certain amount of light stabilizer is also added to the coating to improve the product's indoor weather resistance. In addition, a certain amount of antioxidant is added to the coating to extend the product's service life. In order to promptly eliminate the static electricity accumulated by the carbon ribbon during the printing process and prevent adverse conditions such as static adsorption, dust absorption, and fire discharge, a certain amount of antistatic agent can be added to the peeling layer.

[0035] Preferably, considering the release effect and weather resistance of the peeling layer, the second resin is preferably a thermoplastic acrylic resin, and more preferably a resin with a Tg of 80-130° C. and a molecular weight of 30,000-200,000.

[0036] Preferably, the mesh size of the talc powder is 5000-12000 and the specific surface area is 5-10 g / m 2.

[0037] Preferably, the light stabilizer is a solid triazine ultraviolet absorber.

[0038] Preferably, the light stabilizer is a solid triazine ultraviolet absorber with a melting point of 85-110° C. and a molecular weight of 300-700.

[0039] The beneficial effects of adopting the above scheme are: the absorption mechanism of triazine ultraviolet absorbers is based on two components: first, the compound has a conjugated π-electron system structure, and second, the structure of the compound is capable of hydrogen migration. The ortho-hydroxyl group on the benzene ring and the nitrogen atom on the adjacent triazine ring can form an intramolecular hydrogen bond to form a six-membered ring. The six-membered ring and the surrounding structure form a conjugated system. The energy range required to open the chelate ring is just close to the ultraviolet light energy within the UVA and UVB ranges. When the molecule itself absorbs ultraviolet light, the molecular energy increases, and the weakest NH bond in the six-membered ring breaks. The absorbed energy is released in the form of heat, fluorescence, or phosphorescence, which are harmless to polymer materials, and the molecular structure is restored, thereby repeatedly absorbing large amounts of ultraviolet light, playing a role in protecting the polymer.

[0040] In addition, the UV resistance of solid UV absorbers is better than that of liquid UV absorbers. The reason is that the solid state can be better embedded in the coating resin, just like the effect of filler, so it is more resistant to migration and can show better resistance, while most liquid UV absorbers do not have this effect and are more likely to migrate during use, resulting in poor resistance; secondly, the alcohol friction resistance of solid UV absorbers is better than that of liquid UV absorbers. The solid state can be better embedded in the coating resin to maintain the tightness of the coating, while the liquid state will make the coating structure looser. At the same time, most liquid additives have good viscosity, and polyacrylic resin itself is brittle, which will cause acrylic acid to form resin clumps due to the viscosity of the liquid additive during the friction process. The resin clumps will further damage the coating during the friction process, resulting in reduced alcohol resistance.

[0041] Preferably, the light stabilizer is a benzoate ultraviolet absorber. Since the main action range of the solid triazine ultraviolet absorber is UVA and UVB, in order to further improve the weather resistance, it is necessary to add an absorber that acts in the UVC band to be used in combination with it. The benzoate ultraviolet absorber can convert ultraviolet radiation into heat energy through reversible chemical rearrangement. The solid benzoate ultraviolet absorber preferably has a melting point of 190-250°C.

[0042] Furthermore, the third resin includes at least one of polyester resin, polyacrylate resin, styrene acrylate resin, polyurethane resin, polyethylene resin, polypropylene resin, polyolefin resin, polystyrene resin, polyvinyl chloride resin, polyvinyl butyral resin, amino resin, epoxy resin, hydroxyl-modified acrylic resin, hydroxyl-modified vinyl chloride-acrylate resin, polyester-modified acrylic resin, and acrylic-modified polyester resin;

[0043] The isocyanate curing agent in the curing layer includes at least one of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, and aromatic isocyanate;

[0044] The reactive light stabilizer includes at least one of a phenolic compound ultraviolet absorber, a benzotriazole ultraviolet absorber, a benzophenone ultraviolet absorber, an oxamide ultraviolet absorber, and a triazine ultraviolet absorber.

[0045] The beneficial effects of adopting this further solution are as follows: the curing layer in the present invention serves to: firstly, enhance the coating's adhesion, isolating the effects of water and air on dye oxidation and fading; and secondly, to reduce UV absorber migration, thereby improving weather resistance. To enhance the coating's adhesion, the curing layer is preferably composed of a thermoplastic resin containing reactive groups. To further enhance the adhesion of the cured layer, an isocyanate compound may be added to the aforementioned thermoplastic resin. To enhance weather resistance and prevent UV absorber migration, a certain amount of a reactive light stabilizer may also be added to the coating. This reacts with the curing agent to fix the UV absorber within the coating, reducing UV absorber migration and thereby improving weather resistance.

[0046] Preferably, the third resin is at least one of hydroxyl-modified acrylic resin, polyhydroxyl-modified vinyl chloride-acrylate resin, polyester-modified acrylic resin, acrylic acid-modified polyester and the like.

[0047] Preferably, considering interlayer adhesion and weather resistance, the third resin is a polyhydroxy-modified vinyl chloride-acrylate resin with a Tg of 60-75° C. and a molecular weight of 10,000-50,000.

[0048] Preferably, the isocyanate curing agent is an aromatic isocyanate, including but not limited to 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, toluidine diisocyanate, and p-phenylene diisocyanate.

[0049] Further, the fourth resin includes at least one of cellulose-based resin, polyvinyl acetate resin, polyvinyl alcohol resin, polyurethane resin, polyamide resin, polyester resin, polyacrylic resin, polyolefin resin, polystyrene resin, styrene acrylate resin, vinyl chloride-acrylate resin, vinyl chloride-vinyl acetate resin, and vinyl chloride-vinyl isobutyl ether resin;

[0050] The auxiliary agent includes at least one of inorganic particles and solid lubricants;

[0051] The dispersant in the adhesive layer includes at least one of a cationic wetting and dispersing agent, an anionic wetting and dispersing agent, a nonionic wetting and dispersing agent, an amphoteric wetting and dispersing agent, and a polymeric hyperdispersant.

[0052] The beneficial effects of adopting the above further scheme are: the functions of the adhesive layer in the present invention are as follows: first, after printing is completed, the adhesive layer is located on the pattern receiving layer, providing adhesion between the coatings; second, it provides the main alcohol friction resistance; third, it provides foil retention of the carbon ribbon, preventing the carbon ribbon from having adverse conditions such as coating resin powdering during use.

[0053] The adhesive layer is preferably composed of thermoplastic resin as the base. In order to further enhance the friction resistance of the adhesive layer, a certain amount of additives needs to be added to the coating. In addition, a certain amount of dispersant needs to be added to reduce the time and energy required to complete the dispersion process during powder grinding and to stabilize the dispersion after grinding.

[0054] Preferably, considering the alcohol resistance, film-forming property and compatibility with the pattern receiving layer of the resin, the fourth resin is at least one of polyurethane resin, polyacrylic resin and polyvinyl chloride resin.

[0055] Preferably, the fourth resin is a vinyl chloride-vinyl acetate resin having a Tg of 60-80° C., a vinyl acetate content of 10-20%, and a molecular weight of 30,000-100,000.

[0056] Preferably, the dispersant is a polymeric hyperdispersant.

[0057] Furthermore, the solid release agent includes at least one of polyethylene wax, palmitamide, ethylene bislauric acid amide, behenic acid amide, ethylene bisoleic acid amide, stearic acid amide, ethylene bisstearic acid amide, oleic acid amide, erucic acid amide, oleyl palmitamide, octadecyl stearic acid amide, octadecyl erucic acid amide, pentaerythritol tetrastearate, glyceryl trihydroxystearate, zinc stearate, zinc stearyl phosphate, calcium stearate, magnesium stearate, talc, and wax powder;

[0058] The liquid release agent includes at least one of silicone oil, liquid paraffin, chlorinated paraffin, and n-butyl stearate.

[0059] Preferably, the release agent is a solid release agent.

[0060] Preferably, the melting point of the solid release agent is 50°C-120°C.

[0061] Preferably, the solid lubricant is talcum powder, the mesh size of the talcum powder is 5000-12000, and the specific surface area is 5-10g / m 2 .

[0062] Furthermore, the inorganic particles include at least one of silicon dioxide, aluminum oxide, titanium dioxide, molybdenum disulfide, calcium carbonate, and talc; when the auxiliary agent is the solid lubricant, the solid lubricant includes at least one of microcrystalline wax, carnauba wax, paraffin wax, low molecular weight polyethylene wax, wood wax, honey wax, spermaceti, wool wax, candelilla wax, vaseline, polyester wax, modified wax, and metal soap compounds.

[0063] The beneficial effect of adopting the above further solution is that in order to further improve the friction resistance of the bonding layer, a certain amount of additives needs to be added to the coating.

[0064] Preferably, the inorganic particles have a mesh size of 5000-12000 and a specific surface area of ​​5-10 g / m 2 of fine talc powder.

[0065] Preferably, the molecular weight of the low molecular weight polyethylene wax is 2000-5000.

[0066] Preferably, the metal soap compound is at least one of zinc stearate, zinc stearyl phosphate, calcium stearate, and magnesium stearate.

[0067] Furthermore, the substrate is a transparent flexible plastic film, including at least one of polypropylene, polyethylene naphthalate, polyethylene terephthalate, polyethylene, polyvinyl alcohol, and polymethyl methacrylate.

[0068] Preferably, the surface roughness Ra of the substrate is 0.02-0.1 nm.

[0069] The beneficial effect of adopting the above solution is that the surface roughness of the substrate affects the glossiness of the coating after transfer, and the lower the surface roughness, the higher the glossiness.

[0070] Furthermore, the thickness of the substrate is 4 μm-50 μm, and the surface roughness Ra is 0.02-0.1 nm; the thickness of the back coating is 0.4 μm-1.2 μm; the thickness of the peeling layer is 0.3-5 μm; the thickness of the cured layer is 0.3-5 μm; and the thickness of the adhesive layer is 0.1-1 μm.

[0071] The second object of the present invention is to provide a method for preparing an ultra-high weather-resistant OC protective carbon tape, which is as follows:

[0072] S1: Preparation of liquid: Back coating liquid: Dissolve the first resin in a solvent, then add an isocyanate curing agent, an inorganic filler, a release agent, and an organic silicone oil, mix and dissolve them together to prepare a back coating liquid for standby use; Stripping liquid: Dissolve the second resin in a solvent, then add a release agent, a solid lubricant, a dispersant, a light stabilizer, an antioxidant, and an antistatic agent, mix and dissolve them together to prepare a stripping liquid for standby use; Curing liquid: Dissolve the third resin in a solvent, then add an isocyanate curing agent and a reactive light stabilizer, mix and dissolve them together to prepare a curing liquid for standby use; Adhesive liquid: Dissolve the fourth resin in a solvent, then add an auxiliary agent and a dispersant, mix and dissolve them together to prepare a bonding liquid for standby use;

[0073] S2: applying corona to one side of the substrate;

[0074] S3: Coating: Apply the back coating liquid on the corona-charged surface of the substrate, and then dry it to form a back coating layer for standby use; then apply the stripping liquid on the side of the substrate away from the back coating layer, and then dry it to form a stripping layer; then apply the curing liquid on the side of the stripping layer away from the substrate, and then dry it to form a curing layer; apply the adhesive liquid on the side of the curing layer away from the substrate, and then dry it to form an adhesive layer, thereby obtaining an OC protective carbon tape.

[0075] Furthermore, the drying temperature of the back coating layer is 60-120°C, and the drying time is 0.5-2h; the drying temperature of the peeling layer is 60-120°C, and the drying time is 0.5-2h; the drying temperature of the curing layer is 60-120°C, and the drying time is 0.5-2h; the drying temperature of the bonding layer is 60-120°C, and the drying time is 0.5-2h. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] Figure 1 Schematic diagram of the structure of the OC protective carbon tape prepared in Examples 1-5 of the present invention.

[0077] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0078] 1- back coating layer, 2- substrate, 3- release layer, 4- cured layer, 5- adhesive layer. DETAILED DESCRIPTION

[0079] The principles and features of the present invention are described below. The examples are only used to explain the present invention and are not intended to limit the scope of the present invention. Where specific techniques or conditions are not specified in the examples, the techniques or conditions described in the literature in this field or the product instructions are used. Where the manufacturers of the reagents or instruments used are not specified, they are all conventional products that can be purchased through regular channels.

[0080] Example 1: Preparation of OC protective carbon tape

[0081] S1: Preparation of liquid: Back coating liquid: Dissolve 10 parts of polyvinyl butyral resin (S-LEC BH-6, Sekisui Chemical, Japan) in 60 parts of 2-butanone and 30 parts of toluene, then add 3 parts of isocyanate curing agent (TMHG-80B, Asahi Chemical, Japan), 0.6 parts of talc powder (HY-TA05 with a particle size of 1.5 μm and a D90 particle size of 4.2 μm) D50; Haiyang Powder), 0.6 parts of phosphate ester (MOA-3PK-70; Jiangsu Haian Petrochemical Plant), and 0.5 parts of silicone oil (KF-965-100cs; Shin-Etsu Silicone) were mixed and dissolved to prepare a back coating solution for use; stripping solution: 20 parts of thermoplastic acrylic resin (BR-52; Mitsubishi) were dissolved in 32.7 parts of toluene and 32.7 parts of 2-butanone, and then 0.6 parts of solid release agent (erucamide, melting point 79-83°C; Jiangxi Dongyuan), 2 parts of talc powder (MICRO ACEP-3; Japan Talc), 1 part of dispersant (BYK180; Bi Ke), 20 parts of UV absorber (UV-460 solid; BASF), 10 parts of UV absorber (UV-120 solid; Milan Chemical), 0.4 parts of antioxidant (B-225; BASF), 0.6 parts of antistatic agent (Atmer 262; Croda) were mixed and dissolved to prepare a stripping solution for later use; curing solution: 20 parts of polyhydroxy-modified vinyl chloride-acrylate resin (H15 / 40A; Wacker) were dissolved in 38.2 parts of 2-butanone and 38.2 parts of toluene, and then 3 parts of isocyanate curing agent (TFD-90SB; Dornaide), 10 parts of ultraviolet absorber (Tinuvin 400; liquid; BASF), and 10 parts of ultraviolet absorber (Tinuvin 1130; liquid; BASF) were added and mixed and dissolved to prepare a curing solution for later use; bonding solution: 10 parts of vinyl chloride-vinyl acetate resin (H11 / 59; Wacker) were dissolved in 43 parts of 2-butanone and 43 parts of toluene, and then 3 parts of talc powder (MICROACE P-3; Japan Talc) and 1 part of dispersant (LD-1010; Lida) were added and mixed and dissolved to prepare a bonding solution for later use;

[0082] S2: A 4.5 μm PET film (Lumirror; Toray, Japan) with a surface roughness Ra of 0.04 nm was used as substrate 2, and one side of the substrate 2 was corona-charged.

[0083] S3: Coating: Coating is performed using a gravure coater, first coating the back coating liquid on the corona-charged surface of the substrate 2 with a coating thickness of 0.7μm, and then drying it at 90℃ for 90S to form a back coating layer 1 for standby use; then coating the stripping liquid on the side of the substrate 2 away from the back coating layer 1 with a coating thickness of 1μm, and then drying it at 90℃ for 90S to form a stripping layer 3; then coating the curing liquid on the side of the stripping layer 3 away from the substrate 2 with a coating thickness of 0.5μm, and then drying it at 90℃ for 90S to form a curing layer 4; coating the adhesive liquid on the side of the curing layer 4 away from the substrate 2 with a coating thickness of 0.3μm, and then drying it at 90℃ for 90S to form an adhesive layer 5, thereby obtaining an OC protective carbon tape.

[0084] Example 2: Preparation of OC protective carbon tape

[0085] The difference between this embodiment and embodiment 1 is that the raw materials for preparing the stripping solution are different, and the rest of the steps are the same as those in embodiment 1. Specifically, step S1 is as follows:

[0086] S1: Preparation of liquid: Back coating liquid: the same as in Example 1; Stripping liquid: 15 parts of thermoplastic acrylic resin (MB-12; Bolier) and 5 parts of thermoplastic acrylic resin (MB-2; Bolier) are dissolved in 32.7 parts of toluene and 32.7 parts of 2-butanone, and then 0.6 parts of release agent (erucamide, melting point 79-83°C; Jiangxi Dongyuan), 2 parts of talc powder (MICRO ACE P-3; Japan Talc), 1 part of dispersant (BYK180; Bi Ke), 20 parts of ultraviolet absorber (UV-460 solid; BASF), 10 parts of ultraviolet absorber (UV-120 solid; Milan Chemical), 0.4 parts of antioxidant (B-225; BASF), 0.6 parts of antistatic agent (Atmer 262; Croda) were mixed and dissolved to prepare a stripping solution for later use; curing solution: 20 parts of polyhydroxy-modified vinyl chloride-acrylate resin (H15 / 40A; Wacker) were dissolved in 38.2 parts of 2-butanone and 38.2 parts of toluene, and then 3 parts of isocyanate curing agent (TFD-90SB; Dornade), 10 parts of ultraviolet absorber (Tinuvin 400; liquid; BASF), and 10 parts of ultraviolet absorber (Tinuvin1130; liquid; BASF) were added and mixed and dissolved to prepare a curing solution for later use; bonding solution: 10 parts of vinyl chloride-vinyl acetate resin (H11 / 59; Wacker) were dissolved in 43 parts of 2-butanone and 43 parts of toluene, and then 3 parts of talc powder (MICRO ACE P-3; Japan Talc) and 1 part of dispersant (LD-1010; Lida) were added and mixed and dissolved to prepare a bonding solution for later use.

[0087] Example 3: Preparation of OC protective carbon tape

[0088] The difference between this embodiment and embodiment 1 is that the raw materials for preparing the solidifying liquid are different, and the rest of the steps are the same as those in embodiment 1. Specifically, step S1 is as follows:

[0089] S1: Preparation of liquid: Back coating liquid: the same as in Example 1; Stripping liquid: 15 parts of thermoplastic acrylic resin (MB-12; Bolier) and 5 parts of thermoplastic acrylic resin (MB-2; Bolier) are dissolved in 32.7 parts of toluene and 32.7 parts of 2-butanone, and then 0.6 parts of release agent (erucamide, melting point 79-83°C; Jiangxi Dongyuan), 2 parts of talc powder (MICRO ACE P-3; Japan Talc), 1 part of dispersant (BYK180; Bi Ke), 20 parts of ultraviolet absorber (UV-460 solid; BASF), 10 parts of ultraviolet absorber (UV-120 solid; Milan Chemical), 0.4 parts of antioxidant (B-225; BASF), 0.6 parts of antistatic agent (Atmer 262; Croda) were mixed and dissolved to prepare a stripping solution for later use; curing solution: 10 parts of polyhydroxy-modified vinyl chloride-acrylate resin (H15 / 40A; Wacker) and 10 parts of hydroxy-modified acrylic resin (SGR-015A; Changhao) were dissolved in 38.2 parts of 2-butanone and 38.2 parts of toluene, and then 3 parts of isocyanate curing agent (TFD-90SB; Dornaide), 10 parts of ultraviolet absorber (Tinuvin 400; liquid; BASF), and 10 parts of ultraviolet absorber (Tinuvin 1130; liquid; BASF) were added and mixed and dissolved to prepare a curing solution for later use; adhesive solution: 10 parts of vinyl chloride-vinyl acetate resin (H11 / 59; Wacker) were dissolved in 43 parts of 2-butanone and 43 parts of toluene, and then 3 parts of talc powder (MICRO ACE P-3; Japanese talc), 1 part dispersant (LD-1010; Lida) were mixed and dissolved together to prepare an adhesive solution for later use.

[0090] Example 4: Preparation of OC protective carbon tape

[0091] The difference between this embodiment and embodiment 1 is that the raw materials for preparing the solidifying liquid are different, and the rest of the steps are the same as those in embodiment 1. Specifically, step S1 is as follows:

[0092] S1: Preparation of liquid: Back coating liquid: the same as in Example 1; Stripping liquid: 15 parts of thermoplastic acrylic resin (MB-12; Bolier) and 5 parts of thermoplastic acrylic resin (MB-2; Bolier) are dissolved in 32.7 parts of toluene and 32.7 parts of 2-butanone, and then 0.6 parts of release agent (erucamide, melting point 79-83°C; Jiangxi Dongyuan), 2 parts of talc powder (MICRO ACE P-3; Japan Talc), 1 part of dispersant (BYK180; Bi Ke), 20 parts of ultraviolet absorber (UV-460 solid; BASF), 10 parts of ultraviolet absorber (UV-120 solid; Milan Chemical), 0.4 parts of antioxidant (B-225; BASF), 0.6 parts of antistatic agent (Atmer 262; Croda) were mixed and dissolved to prepare a stripping solution for later use; curing solution: 10 parts of polyhydroxy-modified vinyl chloride-acrylate resin (H15 / 40A; Wacker) and 10 parts of hydroxy-modified acrylic resin (SGR-015A; Changhao) were dissolved in 38.2 parts of 2-butanone and 38.2 parts of toluene, and then 3 parts of isocyanate curing agent (TFD-90SB; Dornaide), 8 parts of UV absorber (Tinuvin 400; liquid; BASF), 10 parts of UV absorber (Tinuvin 1130; liquid; BASF), and 2 parts of UV absorber (Tinuvin152 liquid; BASF) were added and dissolved to prepare a curing solution for later use; adhesive solution: 10 parts of vinyl chloride-vinyl acetate resin (H11 / 59; Wacker) were dissolved in 43 parts of 2-butanone and 43 parts of toluene, and then 3 parts of talc (MICRO ACE P-3; Japanese talc), 1 part dispersant (LD-1010; Lida) were mixed and dissolved together to prepare an adhesive solution for later use.

[0093] Example 5: Preparation of OC protective carbon tape

[0094] The difference between this embodiment and embodiment 1 is that the resins used to prepare the stripping solution and the curing solution are different. The rest of the steps are the same as those in embodiment 1. Specifically, step S1 is as follows:

[0095] S1: Preparation of liquid: Back coating liquid: the same as in Example 1; Stripping liquid: 15 parts of thermoplastic acrylic resin (MB-12; Bolier) and 5 parts of thermoplastic acrylic resin (MB-2; Bolier) are dissolved in 32.7 parts of toluene and 32.7 parts of 2-butanone, and then 0.6 parts of release agent (erucamide, melting point 79-83°C; Jiangxi Dongyuan), 2 parts of talc powder (MICRO ACE P-3; Japan Talc), 1 part of dispersant (BYK180; Bi Ke), 20 parts of ultraviolet absorber (UV-460 solid; BASF), 10 parts of ultraviolet absorber (UV-120 solid; Milan Chemical), 0.4 parts of antioxidant (B-225; BASF), 0.6 parts of antistatic agent (Atmer 262; Croda) were mixed and dissolved to prepare a stripping solution for later use; curing solution: 10 parts of polyhydroxy-modified vinyl chloride-acrylate resin (H15 / 40A; Wacker) and 10 parts of hydroxy-modified acrylic resin (SGR-015A; Changhao) were dissolved in 38.2 parts of 2-butanone and 38.2 parts of toluene, and then 3 parts of isocyanate curing agent (TFD-90SB; Dornaide), 8 parts of UV absorber (Tinuvin 400; liquid; BASF), 10 parts of UV absorber (Tinuvin 1130; liquid; BASF) and 2 parts of ultraviolet absorber (Tinuvin152 liquid; BASF) were mixed and dissolved together to form a curing liquid for later use; bonding liquid: 5 parts of vinyl chloride-vinyl acetate resin (H11 / 59; Wacker) and 5 parts of polyester modified acrylic resin (SGR-2600; Changhao) were dissolved in 43 parts of 2-butanone and 43 parts of toluene, and then 3 parts of talc powder (MICRO ACE P-3; Japan Talc) and 1 part of dispersant (LD-1010; Lida) were added and dissolved together to form a bonding liquid for later use.

[0096] Comparative Example 1: Preparation of OC protective carbon tape

[0097] Compared with Example 1, this comparative example differs in that no stripping liquid, curing liquid, or bonding liquid is prepared. The remaining raw materials and steps are the same as those in Example 1. Specifically, step S1 is as follows:

[0098] S1: Preparation liquid: back coating liquid: the same as Example 1;

[0099] S2: Same as Example 1;

[0100] S3: Coating: The back coating liquid is first coated on the corona-charged surface of the substrate 2 by a gravure coater with a coating thickness of 0.7 μm, and then dried at 90° C. for 90 seconds to form a back coating layer 1, thereby obtaining an OC protective carbon tape.

[0101] Comparative Example 2: Preparation of OC protective carbon tape

[0102] Compared with Example 1, this comparative example differs in that no curing liquid and bonding liquid are prepared, and the remaining raw materials and steps are the same as those in Example 1. Specifically, step S1 is as follows:

[0103] S1: Preparation liquid: back coating liquid: the same as in Example 1; stripping liquid: the same as in Example 1;

[0104] S2: Same as Example 1;

[0105] S3: Coating: Coating is performed using a gravure coater. First, the back coating liquid is coated on the corona-charged surface of the substrate 2 with a coating thickness of 0.7 μm, and then dried at 90°C for 90S to form a back coating layer 1; then, the stripping liquid is coated on the side of the substrate 2 away from the back coating layer 1 with a coating thickness of 1 μm, and then dried at 90°C for 90S to form a stripping layer 3; that is, an OC protective carbon tape is obtained.

[0106] Comparative Example 3: Preparation of OC protective carbon tape

[0107] This comparative example is different from Example 1 in that no stripping solution or bonding solution is prepared. The remaining raw materials and steps are the same as those in Example 1. The specific steps are as follows:

[0108] S1: Preparation liquid: Back coating liquid: the same as in Example 1; Curing liquid: the same as in Example 1;

[0109] S2: Same as Example 1;

[0110] S3: Coating: Coating is performed using a gravure coater. First, the back coating liquid is coated on the corona-charged surface of the substrate 2 with a coating thickness of 0.7 μm, and then dried at 90°C for 90S to form a back coating layer 1; then the curing liquid is coated on the side of the substrate 2 away from the back coating layer 1 with a coating thickness of 0.5 μm, and then dried at 90°C for 90S to form a curing layer 4; that is, an OC protective carbon tape is obtained.

[0111] Comparative Example 4: Preparation of OC protective carbon tape

[0112] This comparative example is different from Example 1 in that no stripping solution or curing solution is prepared, and the remaining raw materials and steps are the same as those in Example 1. The specific steps are as follows:

[0113] S1: Preparation liquid: Back coating liquid: the same as in Example 1; Adhesive liquid: the same as in Example 1;

[0114] S2: Same as Example 1;

[0115] S3: Coating: Coating is performed using a gravure coater. First, the back coating liquid is coated on the corona-charged surface of the substrate 2 with a coating thickness of 0.7 μm, and then dried at 90°C for 90S to form a back coating layer 1; the adhesive liquid is coated on the side of the substrate 2 away from the back coating layer 1 with a coating thickness of 0.3 μm, and then dried at 90°C for 90S to form a solidified layer 4; that is, an OC protective carbon tape is obtained.

[0116] Comparative Example 5: Preparation of OC protective carbon tape

[0117] This comparative example differs from Example 1 in that no adhesive solution and adhesive layer 5 are prepared. The remaining raw materials and steps are the same as those in Example 1. The specific steps are as follows:

[0118] S1: Preparation liquid: back coating liquid: the same as in Example 1; stripping liquid: the same as in Example 1; curing liquid: the same as in Example 1;

[0119] S2: Same as Example 1;

[0120] S3: Coating: Coating is performed using a gravure coater. First, the back coating liquid is coated on the corona-charged surface of the substrate 2 with a coating thickness of 0.7 μm, and then dried at 90°C for 90S to form a back coating layer 1; then, the stripping liquid is coated on the side of the substrate 2 away from the back coating layer 1 with a coating thickness of 1 μm, and dried at 90°C for 90S to form a stripping layer 3; finally, the curing liquid is coated on the side of the stripping layer 3 away from the back coating layer 1 with a coating thickness of 0.5 μm, and dried to form a curing layer 4, thereby obtaining an OC protective carbon tape.

[0121] Comparative Example 6: Preparation of OC protective carbon tape

[0122] Compared with Example 1, this comparative example differs in that no curing liquid and curing layer 4 are prepared. The remaining raw materials and steps are the same as those in Example 1. The specific steps are as follows:

[0123] S1: Preparation liquid: back coating liquid: the same as in Example 1; stripping liquid: the same as in Example 1; adhesive liquid: the same as in Example 1;

[0124] S2: Same as Example 1;

[0125] S3: Coating: Coating is performed using a gravure coater. First, the back coating liquid is coated on the corona-charged surface of the substrate 2 with a coating thickness of 0.7 μm, and then dried at 90°C for 90S to form a back coating layer 1; the stripping liquid is coated on the side of the substrate 2 away from the back coating layer 1 with a coating thickness of 1 μm, and then dried at 90°C for 90S to form a stripping layer 3; finally, the adhesive liquid is coated on the side of the stripping layer 3 away from the back coating layer 1 with a coating thickness of 0.3 μm, and dried to form an adhesive layer 5, thereby obtaining an OC protective carbon tape.

[0126] Comparative Example 7: Preparation of OC protective carbon tape

[0127] This comparative example differs from Example 1 in that no stripping solution and stripping layer 3 are prepared. The remaining raw materials and steps are the same as those in Example 1. The specific steps are as follows:

[0128] S1: Preparation liquid: back coating liquid: the same as in Example 1; curing liquid: the same as in Example 1; adhesive liquid: the same as in Example 1;

[0129] S2: Same as Example 1;

[0130] S3: Coating: Coating is performed using a gravure coater. First, the back coating liquid is coated on the corona-charged surface of the substrate 2 with a coating thickness of 0.7 μm, and then dried at 90°C for 90S to form a back coating layer 1; the curing liquid is coated on the side of the substrate 2 away from the back coating layer 1 with a coating thickness of 0.5 μm, and then dried at 90°C for 90S to form a curing layer 4; finally, the adhesive liquid is coated on the side of the peeling layer 3 away from the back coating layer 1 with a coating thickness of 0.3 μm, and dried to form an adhesive layer 5, thereby obtaining an OC protective carbon tape.

[0131] Comparative Example 8: Preparation of OC protective carbon tape

[0132] This comparative example is different from Example 1 in that the type of ultraviolet absorber in the stripping solution is different. The remaining raw materials and steps are the same as those in Example 1. The specific step S1 is as follows:

[0133] S1: Preparation of liquid: Back coating liquid: the same as in Example 1; Stripping liquid: 20 parts of thermoplastic acrylic resin (BR-52; Mitsubishi) were dissolved in 32.7 parts of toluene and 32.7 parts of 2-butanone, and then 0.6 parts of release agent (erucamide, melting point 79-83°C; Jiangxi Dongyuan), 2 parts of talc powder (MICRO ACE P-3; Japan Talc), 1 part of dispersant (BYK180; Bick), 20 parts of ultraviolet absorber (UV-477 solid; BASF), 10 parts of ultraviolet absorber (UV-120 solid; Milan Chemical), 0.4 parts of antioxidant (B-225; BASF), and 0.6 parts of antistatic agent (Atmer 262; Croda) were added and mixed and dissolved to prepare a stripping liquid for later use; Adhesive liquid: the same as in Example 1.

[0134] Comparative Example 9: Preparation of OC protective carbon tape

[0135] Compared with Example 1, this comparative example differs in that the stripping solution does not contain talc powder, and the remaining raw materials and steps are the same as those in Example 1. Specifically, step S1 is as follows:

[0136] S1: Preparation of liquid: Back coating liquid: the same as in Example 1; Stripping liquid: 20 parts of thermoplastic acrylic resin (BR-52; Mitsubishi) were dissolved in 32.7 parts of toluene and 32.7 parts of 2-butanone, and then 0.6 parts of release agent (erucamide, melting point 79-83°C; Jiangxi Dongyuan), 20 parts of ultraviolet absorber (UV-477 solid; BASF), 10 parts of ultraviolet absorber (UV-120 solid; Milan Chemical), 0.4 parts of antioxidant (B-225; BASF), and 0.6 parts of antistatic agent (Atmer 262; Croda) were added and mixed and dissolved to prepare a stripping liquid for later use; Adhesive liquid: the same as in Example 1.

[0137] Comparative Example 10: Preparation of OC protective carbon tape

[0138] Compared with Example 1, this comparative example differs in that no release agent is added to the stripping solution, and the remaining raw materials and steps are the same as those in Example 1. Specifically, step S1 is as follows:

[0139] S1: Preparation of liquid: Back coating liquid: the same as in Example 1; Stripping liquid: 20 parts of thermoplastic acrylic resin (BR-52; Mitsubishi) are dissolved in 33 parts of toluene and 33 parts of 2-butanone, and then 20 parts of ultraviolet absorber (UV-460 solid; BASF), 10 parts of ultraviolet absorber (UV-120 solid; Milan Chemical), 0.4 parts of antioxidant (B-225; BASF), 0.6 parts of antistatic agent (Atmer 262; Croda), 2 parts of talc powder (MICRO ACE P-3; Japan Talc), and 1 part of dispersant (BYK180; BYK) are added and mixed and dissolved to prepare a stripping liquid for later use; Curing liquid: the same as in Example 1; Adhesive liquid: the same as in Example 1.

[0140] Comparative Example 11: Preparation of OC protective carbon tape

[0141] This comparative example is different from Example 1 in that the substrate 2 used is different. The remaining raw materials and steps are the same as those of Example 1. The specific step S2 is as follows:

[0142] S2: A 4.5 μm PET film with a surface roughness of Ra=0.04 nm was used as the substrate 2 , and both surfaces of the substrate 2 were corona-applied.

[0143] Comparative Example 12: Preparation of OC protective carbon tape

[0144] This comparative example is different from Example 1 in that the raw materials of the solidifying liquid are different. The other raw materials and steps are the same as those of Example 1. The specific step S1 is as follows:

[0145] S1: Preparation of liquid: Back coating liquid: the same as in Example 1; Stripping liquid: the same as in Example 1; Curing liquid: 20 parts of polyhydroxy-modified vinyl chloride-acrylate resin (H15 / 40A; Wacker) are dissolved in 39.5 parts of toluene and 39.5 parts of 2-butanone, and then 10 parts of ultraviolet absorber (Tinuvin 571 liquid; BASF), 10 parts of ultraviolet absorber (Tinuvin 292 liquid; BASF), and 3 parts of isocyanate curing agent (TFD-90SB; Dornade) are added and mixed and dissolved to prepare a curing liquid for use; Adhesive liquid: the same as in Example 1.

[0146] Comparative Example 13: Preparation of OC protective carbon tape

[0147] This comparative example is different from Example 1 in that the raw materials of the adhesive layer are different. The remaining raw materials and steps are the same as those of Example 1. The specific step S1 is as follows:

[0148] S1: Prepare liquid: Back coating liquid: the same as in Example 1; Stripping liquid: the same as in Example 1; Curing liquid: the same as in Example 1; Adhesive liquid: Dissolve 10 parts of vinyl chloride-vinyl acetate resin (H11 / 59; Wacker) in 45 parts of 2-butanone and 45 parts of toluene to prepare an adhesive liquid for use.

[0149] Comparative Example 14: Preparation of OC protective carbon tape

[0150] This comparative example is different from Example 1 in that the particle size of the talc powder in the back coating layer is different. The remaining raw materials and steps are the same as those in Example 1. The specific step S1 is as follows:

[0151] S1: Preparation of liquid: Back coating liquid: 10 parts of polyvinyl butyral resin (S-LEC BH-6, Sekisui Chemical, Japan) were dissolved in 60 parts of 2-butanone and 30 parts of toluene, and then 3 parts of isocyanate curing agent (TMHG-80B; Asahi Chemical, Japan), 0.6 parts of talc powder with a D50 particle size of 6 μm and a D90 particle size of 13.5 μm (HY-TA05 D50; Haiyang Powder), 0.6 parts of phosphate ester (MOA-3PK-70; Jiangsu Hai'an Petrochemical Plant), and 0.5 parts of silicone oil (KF-965-100cs; Shin-Etsu Silicone) were added and mixed and dissolved to prepare a back coating liquid for use; Stripping liquid: the same as in Example 1; Curing liquid: the same as in Example 1; Adhesive liquid: the same as in Example 1.

[0152] Test example: performance testing

[0153] The OC protective ribbons prepared in Examples 1-5 and Comparative Examples 1-14 were tested for printing using a DTP330 thermal sublimation soft label printer. The original ribbons were used, the print sample size was 6×6 inches, and the printing speed was 6 m / min. The specific test items are as follows:

[0154] (1) Glossiness test and evaluation standards

[0155] The protective layers (peel layer, curing layer, and adhesive layer) of the OC protective ribbons prepared in Examples 1-5 and Comparative Examples 1-14 were transferred onto black and white patterned photographic paper using a DTP330 printer to produce test samples. The 20° glossiness of partial black and white areas was measured using a Tri-Touchscreen NHG268 glossmeter. The average value was read and the glossiness was evaluated based on the evaluation criteria in Table 1. The evaluation results are shown in Table 3.

[0156] Table 1: Glossiness evaluation criteria

[0157]

[0158] (2) Alcohol friction resistance test and evaluation standards

[0159] The protective layers of the OC protective ribbons prepared in Examples 1-5 and Comparative Examples 1-14 were transferred to photographic paper with a 16-step Cyan monochrome pattern using a DTP330 printer. The resulting test samples were then rubbed 1200 times using a DZ-204 alcohol rub tester and a WIP-1009D rubbing cloth at a 500g load and a rubbing speed of 60 strokes / min. The color density of the test samples was measured before and after rubbing using an X-Rite i1-PRO3 colorimeter. The ratio of the color density before and after rubbing was calculated, and the alcohol rubbing resistance was evaluated based on Table 2. The evaluation results are shown in Table 3.

[0160] Table 2: Color density evaluation criteria

[0161]

[0162] (3) Weather resistance test

[0163] The OC protective ribbons prepared in Examples 1-5 and Comparative Examples 1-14 were transferred using a DTP330 printer onto photographic paper with a three-color monochrome pattern of yellow, magenta, and cyan densities of 0.5, 1.0, and the highest order. The resulting test samples were then tested for pre-weathering color density using an X-Rite i1-PRO3 colorimeter. The samples were then aged using a xenon lamp with a continuous spectrum between 300 nm and 1200 nm. The illumination on the sample surface was between 30 klx and 100 klx. A standard window glass filter was placed between the xenon light source and the sample. The blackboard temperature in the chamber was set at 40°C ± 3°C, and the relative humidity was set at 50% ± 5%. The exposure period was 24 hours with drying, and the accelerated aging test lasted 1200 hours. After the test, the post-weathering color density was measured using an X-Rite i1-PRO3 colorimeter, and the ratio of the post-weathering color density to the pre-weathering color density was calculated. The results are shown in Table 3.

[0164] Table 3

[0165]

[0166] From Table 3 we can get:

[0167] (1) The glossiness and alcohol friction resistance evaluation results of the OC protective carbon ribbons of Examples 1-5 were all A, and the calculated weather resistance results were above 94.6%, with the highest being 98.4, which were better than the comprehensive performance of the OC protective carbon ribbons of Comparative Examples 1-14 during the thermal transfer process.

[0168] (2) Comparative Examples 1-7 have different structures of thermal transfer ribbons compared with the examples. The ribbon structure of Comparative Example 1 only includes a substrate and a back coating layer, and has the worst performance. Comparative Example 2 has no curing layer or adhesive layer, and its weather resistance and alcohol friction resistance are reduced compared with Examples 1-5. Comparative Example 3 has no peeling layer or adhesive layer, and the test results show that all performances are poor, with a weather resistance of only 69.7%; Comparative Example 4 has no peeling layer or curing layer, and only the friction resistance is B, and the other performances are poor, with a weather resistance of only 15%; Comparative Example 5 has various performances comparable to those of the examples, but is not resistant to alcohol friction, which may be due to the lack of an adhesive layer; Comparative Example 6 lacks a curing layer, and the glossiness and alcohol friction resistance evaluation results are both A, but the weather resistance calculation result is poor, at 72.1%; Comparative Example 7 lacks a peeling layer, and only the alcohol friction resistance test result is good.

[0169] (3) The difference between Comparative Examples 8-14 and Example 1 lies in the different raw materials of each layer. The light stabilizer in the peeling layer of Comparative Example 8 is a liquid UV absorber, the peeling layer of Comparative Example 9 does not contain a solid lubricant, and the adhesive layer of Comparative Example 13 does not contain an additive. The gloss test results of the three comparative examples are good, but all are not resistant to alcohol friction; the peeling layer of Comparative Example 10 does not contain a release agent; the substrate used in Comparative Example 11 has a large surface roughness and average gloss. The reason for this may be that the OC protective carbon ribbon of Comparative Example 10 has poor smoothness during high-speed printing, while the substrate of Comparative Example 11 has a large surface roughness, and the greater the surface roughness, the lower the gloss. The curing layer of the OC protective carbon ribbon of Comparative Example 12 uses a non-reactive UV absorber. It can be seen that the setting of the curing layer in the OC protective carbon ribbon of the present invention and the non-reactive UV absorber added therein can greatly improve the weather resistance of the OC protective carbon ribbon and can meet the requirements of long-term reliable use.

[0170] In summary, the OC protective ribbon provided by the present invention comprises a back coating layer 1 on one side of the substrate and an OC protective layer (comprising a release layer 3, a curing layer 4, and an adhesive layer 5) on the other side. The resulting OC protective ribbon exhibits excellent foil retention during high-speed printing while also achieving high weather resistance, high alcohol resistance, and high gloss. This allows for diverse applications, broadening the range of uses and adaptability of thermal transfer ribbons.

[0171] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An ultra-high weather-resistant OC protective carbon tape, characterized in that: The OC protective carbon tape comprises an adhesive layer, a curing layer, a peeling layer, a substrate, and a back coating layer arranged in sequence from top to bottom; The peeling layer comprises the following raw materials in parts by weight: 19-22 parts of a second resin, 0.5-0.7 parts of a release agent, 1.8-2.2 parts of a solid lubricant, 0.9-1.2 parts of a dispersant, 26-32 parts of a light stabilizer, 0.3-0.6 parts of an antioxidant, and 0.5-0.8 parts of an antistatic agent; The curing layer comprises the following raw materials in parts by weight: 18-22 parts of a third resin, 2-4 parts of an isocyanate curing agent, and 19-22 parts of a reactive light stabilizer; The adhesive layer comprises the following raw materials in parts by weight: 8-12 parts of the fourth resin, 2-4 parts of the auxiliary agent, and 0.8-1.1 parts of the dispersant; The second resin includes at least one of acrylonitrile-butadiene-styrene copolymer resin, polystyrene resin, polycarbonate resin, polymethyl methacrylate resin, polyacrylic acid resin, and thermoplastic acrylic resin; The release agent in the peeling layer is at least one of a solid release agent and a liquid release agent; The solid lubricant includes at least one of talc powder, wax powder, and metal soap; The dispersant in the peeling layer includes at least one of a cationic wetting dispersant, an anionic wetting dispersant, a nonionic wetting dispersant, an amphoteric wetting dispersant, and a polymeric hyperdispersant; The light stabilizer in the release layer includes at least one of a light shielding agent, an ultraviolet absorber, a quencher, a free radical scavenger, and a hydroperoxide decomposer; The antioxidant includes at least one of hindered phenol antioxidants, phosphite antioxidants, thio antioxidants, composite antioxidants, and hindered amine antioxidants; The antistatic agent includes at least one of sulfuric acid derivatives, phosphoric acid derivatives, amines, quaternary ammonium salts, imidazoles, and ethylene oxide derivatives; The third resin includes at least one of polyester resin, polyacrylate resin, styrene acrylate resin, polyurethane resin, polyethylene resin, polypropylene resin, polyolefin resin, polystyrene resin, polyvinyl chloride resin, polyvinyl butyral resin, amino resin, epoxy resin, hydroxyl-modified acrylic resin, polyhydroxyl-modified vinyl chloride-acrylate resin, polyester-modified acrylic resin, and acrylic-modified polyester resin; The isocyanate curing agent in the curing layer includes at least one of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, and aromatic isocyanate; The reactive light stabilizer includes at least one of a phenolic compound ultraviolet absorber, a benzotriazole ultraviolet absorber, a benzophenone ultraviolet absorber, an oxamide ultraviolet absorber, and a triazine ultraviolet absorber; The fourth resin includes at least one of a cellulose-based resin, a polyvinyl acetate resin, a polyvinyl alcohol resin, a polyurethane resin, a polyamide resin, a polyester resin, a polyacrylic resin, a polyolefin resin, a polystyrene resin, a styrene acrylate resin, a vinyl chloride-acrylate resin, a vinyl chloride-vinyl acetate resin, and a vinyl chloride-vinyl isobutyl ether resin; The auxiliary agent includes at least one of inorganic particles and solid lubricants; The dispersant in the adhesive layer includes at least one of a cationic wetting and dispersing agent, an anionic wetting and dispersing agent, a nonionic wetting and dispersing agent, an amphoteric wetting and dispersing agent, and a polymeric hyperdispersant.

2. The ultra-high weather-resistant OC protective carbon tape according to claim 1, characterized in that: The back coating layer comprises the following raw materials in parts by weight: 9-11 parts of a first resin, 2-4 parts of an isocyanate curing agent, 0.5-1 parts of an inorganic filler, 0.5-0.9 parts of a release agent, and 0.3-0.5 parts of an organic silicone oil; The first resin is a thermoplastic resin; The isocyanate curing agent in the back coating layer includes at least one of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, and aromatic isocyanate; The inorganic filler includes at least one of talc, kaolin, calcium carbonate, aluminum hydroxide, silicon dioxide, graphite, and boron nitride; The release agent in the back coating layer includes at least one of phosphate ester, metal soap, silicone oil, and surfactant.

3. The ultra-high weather-resistant OC protective carbon tape according to claim 1, characterized in that: The solid release agent comprises at least one of polyethylene wax, palmitamide, ethylene bislauric acid amide, behenic acid amide, ethylene bisoleic acid amide, stearic acid amide, ethylene bisstearic acid amide, oleic acid amide, erucic acid amide, oleyl palmitamide, octadecyl stearic acid amide, octadecyl erucic acid amide, pentaerythritol tetrastearate, glyceryl trihydroxystearate, zinc stearate, zinc stearyl phosphate, calcium stearate, magnesium stearate, talc, and wax powder; The liquid release agent includes at least one of silicone oil, liquid paraffin, chlorinated paraffin, and n-butyl stearate.

4. The ultra-high weather-resistant OC protective carbon tape according to claim 1, characterized in that: The inorganic particles include at least one of silicon dioxide, aluminum oxide, titanium dioxide, molybdenum disulfide, calcium carbonate, and talc; when the auxiliary agent is the solid lubricant, the solid lubricant includes at least one of microcrystalline wax, carnauba wax, paraffin wax, low molecular weight polyethylene wax, wood wax, honey wax, spermaceti, wool wax, candelilla wax, vaseline, polyester wax, modified wax, and metal soap compounds.

5. The ultra-high weather-resistant OC protective carbon tape according to claim 1, characterized in that: The substrate is a transparent flexible plastic film, including at least one of polypropylene, polyethylene naphthalate, polyethylene terephthalate, polyethylene, polyvinyl alcohol, and polymethyl methacrylate.

6. The ultra-high weather-resistant OC protective carbon tape according to claim 1, characterized in that: The thickness of the substrate is 4 μm-50 μm, and the surface roughness Ra is 0.02-0.1 nm; the thickness of the back coating is 0.4 μm-1.2 μm; the thickness of the peeling layer is 0.3-5 μm; the thickness of the curing layer is 0.3-5 μm; and the thickness of the adhesive layer is 0.1-1 μm.

7. A method for preparing an ultra-high weather-resistant OC protective carbon tape according to any one of claims 1 to 6, characterized in that: The preparation method of the carbon ribbon is as follows: S1: Preparation of liquid: Back coating liquid: Dissolve the first resin in a solvent, then add an isocyanate curing agent, an inorganic filler, a release agent, and an organic silicone oil, mix and dissolve them together to prepare a back coating liquid for standby use; Stripping liquid: Dissolve the second resin in a solvent, then add a release agent, a solid lubricant, a dispersant, a light stabilizer, an antioxidant, and an antistatic agent, mix and dissolve them together to prepare a stripping liquid for standby use; Curing liquid: Dissolve the third resin in a solvent, then add an isocyanate curing agent and a reactive light stabilizer, mix and dissolve them together to prepare a curing liquid for standby use; Adhesive liquid: Dissolve the fourth resin in a solvent, then add an auxiliary agent and a dispersant, mix and dissolve them together to prepare a bonding liquid for standby use; S2: applying corona to one side of the substrate; S3: Coating: Apply the back coating liquid on the corona-charged surface of the substrate, and then dry it to form a back coating layer for standby use; then apply the stripping liquid on the side of the substrate away from the back coating layer, and then dry it to form a stripping layer; then apply the curing liquid on the side of the stripping layer away from the substrate, and then dry it to form a curing layer; apply the adhesive liquid on the side of the curing layer away from the substrate, and then dry it to form an adhesive layer, thereby obtaining an OC protective carbon tape.

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