Transfer coating for improving scratch resistance of tobacco transferring paper, and preparation method therefor

Abstract

The present invention specifically relates to the field of tobacco packaging, and discloses a transfer coating for improving the scratch resistance of tobacco transferring paper, and a preparation method therefor. The coating consists of a polyurethane (PU) resin, an acrylate resin and an epoxy resin, and auto-repairing microcapsules are added thereto. The shell material of the auto-repairing microcapsules is a polylactic acid-polyglycolic acid copolymer, which is internally filled with silica nanoparticles, polydimethylsiloxane, an epoxy resin, and vitamin E that serves as an antioxidant. The microcapsules are prepared by means of a double emulsion method, in which chitosan is used as a stabilizer, polyethylene glycol is used as an emulsifier and carbon nanotubes are used as a reinforcing agent. When a coating layer is damaged, the microcapsules break, and release a repairing agent to automatically repair cracks. The coating also contains a nanomaterial and a functional filler, which significantly improve the wear resistance and mechanical strength of the coating layer. By means of the improvements, the transfer coating of the present invention prolongs the service life of tobacco transferring paper and provides better scratch resistance.

Description

A transfer coating for improving the abrasion resistance of tobacco transfer paper and its preparation method Technical Field

[0001] This invention relates to the field of tobacco packaging technology, and more specifically, to a transfer coating for improving the abrasion resistance of tobacco transfer paper and its preparation method. Background Technology

[0002] Tobacco transfer paper, a special type of paper used for tobacco packaging and transfer, is widely used in the tobacco industry. Existing tobacco transfer papers typically employ traditional coating processes, applying a protective coating to the paper surface to improve its abrasion resistance and durability. These traditional coating materials mainly include polyurethane resin, acrylic resin, and epoxy resin, which provide certain mechanical strength and chemical stability. In addition, some coatings also incorporate functional fillers and nanomaterials to further enhance the overall performance of the coating.

[0003] Although existing technologies have improved the abrasion resistance and durability of tobacco transfer paper to some extent, some significant defects and shortcomings still exist. Traditional coating materials are easily subject to mechanical damage and wear during use. Once the coating is damaged, its protective effect drops rapidly and it cannot self-repair, resulting in a significant reduction in the service life of tobacco transfer paper. Secondly, while improving the hardness and abrasion resistance of the coating, existing coating technologies often sacrifice the flexibility and adhesion of the coating, causing the coating to easily peel off and crack under high stress conditions. Therefore, there is still considerable room for improvement in many aspects of tobacco transfer paper coatings. Summary of the Invention

[0004] To overcome the aforementioned deficiencies of the prior art, embodiments of the present invention provide a transfer coating for improving the abrasion resistance of tobacco transfer paper and a method for preparing the same. By adding self-healing microcapsules to a coating composed of polyurethane (PU) resin, acrylate resin, and epoxy resin, the coating can automatically repair cracks when damaged, thereby extending the service life of the coating and solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a transfer coating for improving the abrasion resistance of tobacco transfer paper, wherein the transfer coating comprises the following components and their weight percentages:

[0006] Polyurethane resin 35-45%, acrylate resin 15-25%, epoxy resin 10-15%, self-healing microcapsules 7-12%, solvent 10-20%, additives 2-5%, nano silver particles 0.5-1%;

[0007] Self-healing microcapsules contain the following components:

[0008] The shell material is 50-60% polylactic acid-polyglycolic acid copolymer;

[0009] The core material is a complex containing 5-10% silica nanoparticles, 30-40% polydimethylsiloxane, 20-30% epoxy resin, and 1-2% antioxidant vitamin E.

[0010] The stabilizer is chitosan, 3-5%;

[0011] The emulsifier is polyethylene glycol, 1-3%;

[0012] The reinforcing agent is carbon nanotubes, 2-3%;

[0013] The microcapsules were prepared by a double emulsion method, in which the shell material encapsulates the core material to form microcapsules with a diameter of 0.5-2 micrometers.

[0014] In a preferred embodiment, the transfer coating comprises the following components and their weight percentages: 1-3% nano-titanium dioxide, 1-2% nano-boron nitride, 0.5-1.5% nano-zirconia, 2-4% polymethyl methacrylate microspheres, and 0.5-1% triethanolamine.

[0015] In a preferred embodiment, the transfer coating comprises the following components and their weight percentages: 0.5-1% graphene, 1-2% titanium boride fiber, 1-2% barium titanate microspheres, 0.5-1% polytetrafluoroethylene micropowder, and 1-2% high-density polyethylene microparticles.

[0016] In a preferred embodiment, the transfer coating comprises the following components and their weight percentages: 1-2% photoinitiator, 5-10% UV-curable acrylate resin, 0.5-1% pyrrolidone, 3-5% trimethylolpropane triacrylate, and 1-2% divinylbenzene.

[0017] In a preferred embodiment, the transfer coating comprises the following components and their weight percentages: 5-10% silicone resin, 3-5% sodium silicate sol, 1-2% hydroxyl silicone oil, 0.5-1% silane coupling agent, 2-3% tetraethyl orthosilicate, and 0.5-1% titanium dioxide nanoparticles.

[0018] In a preferred embodiment, a method for preparing a transfer coating that improves the abrasion resistance of tobacco transfer paper:

[0019] Step 1: Preparation of self-healing microcapsules

[0020] 1.1 Dissolving the shell material: Dissolve 50% to 60% of polylactic acid-polyglycolic acid copolymer in dichloromethane and stir until homogeneous to form a PLGA solution;

[0021] 1.2 Preparation of core material: 5% to 10% silica nanoparticles, 30% to 40% polydimethylsiloxane, 20% to 30% epoxy resin and 1% to 2% vitamin E are mixed evenly to form core material;

[0022] 1.3 Emulsifying the primary emulsion: The core material is slowly added to the PLGA solution and a primary emulsion is formed under high-speed stirring. 3% to 5% chitosan and 1% to 3% polyethylene glycol are added as stabilizers and emulsifiers, and stirring is continued.

[0023] 1.4 Microcapsule formation: The colostrum was added dropwise to a 0.5% to 1% polyvinyl alcohol aqueous solution, and the phase was separated by continuous stirring to form microcapsules; the microcapsules were separated by centrifugation, washed and dried to obtain self-healing microcapsules with a diameter of 0.5 to 2 micrometers;

[0024] Step 2: Preparation of nanomaterial-reinforced matrix liquid

[0025] 2.1 Dispersing nanomaterials: 1% to 3% nano-titanium dioxide, 1% to 2% nano-boron nitride, and 0.5% to 1.5% nano-zirconia are dispersed in ethanol by ultrasonic dispersion to form a nanomaterial dispersion.

[0026] 2.2 Mixed base solution: Add 2% to 4% of polymethyl methacrylate microspheres and 0.5% to 1% of triethanolamine to the nanomaterial dispersion, and mix evenly under high-speed shearing to form a nanomaterial reinforced base solution;

[0027] Step 3: Preparation of functional filler base liquid

[0028] 3.1 Mixed filler: 0.5% to 1% graphene, 1% to 2% titanium boride fiber, 1% to 2% barium titanate microspheres, 0.5% to 1% polytetrafluoroethylene micro powder and 1% to 2% high-density polyethylene microparticles are mixed;

[0029] 3.2 Preparation of base solution: The above filler mixture is gradually added to the nanomaterial-reinforced base solution obtained in step 2.2 while stirring to form a functional filler base solution;

[0030] Step 4: Prepare surface hardening base liquid

[0031] 4.1 Addition of photoinitiator: Add 1% to 2% photoinitiator, 5% to 10% UV-curable acrylate resin, 0.5% to 1% pyrrolidone, 3% to 5% trimethylolpropane triacrylate and 1% to 2% divinylbenzene to the functional filler base liquid, stir evenly to form a surface-hardening base liquid;

[0032] Step 5: Preparation of organic-inorganic hybrid base liquid

[0033] 5.1 Organic-inorganic hybridization: Add 5% to 10% organosilicon resin, 3% to 5% sodium silicate sol, 1% to 2% hydroxyl silicone oil, 0.5% to 1% silane coupling agent, 2% to 3% tetraethyl orthosilicate and 0.5% to 1% titanium dioxide nanoparticles to the surface hardening base liquid, stir evenly to form an organic-inorganic hybrid base liquid;

[0034] Step 6: Prepare the final coating

[0035] 6.1 Adding self-healing microcapsules: Slowly add 7% to 12% of the self-healing microcapsules prepared in step 1 to the organic-inorganic hybrid base liquid, stirring at low speed to avoid microcapsule rupture;

[0036] 6.2 Mixing the coating base liquid: Mix the above mixture with 35% to 45% polyurethane resin, 15% to 25% acrylic resin and 10% to 15% epoxy resin, and stir until uniform; add 0.5% to 1% nano silver particles, and continue stirring to form the final coating.

[0037] Step 7: Coating and Curing

[0038] 7.1 Coating process: The final coating is uniformly coated on the surface of the tobacco transfer paper using a scraping, spraying, or dip coating process to ensure uniform coating.

[0039] 7.2 Curing process: The coated transfer paper is baked at 80 to 100 degrees Celsius for 40 to 70 minutes to allow the coating to fully cure into a film, thus completing the preparation.

[0040] The technical effects and advantages of this invention are as follows:

[0041] Improved abrasion resistance of self-healing coatings: By adding self-healing microcapsules to coatings composed of polyurethane (PU) resin, acrylic resin, and epoxy resin, the coating can automatically repair cracks when damaged, extending the service life of the coating. It is particularly suitable for repairing mechanical damage to tobacco transfer paper during processing and use.

[0042] Nanomaterial-enhanced coating for high wear resistance: Nano-titanium dioxide, nano-boron nitride and nano-zirconia are added to the coating and uniformly distributed through ultrasonic dispersion technology, which significantly improves the hardness and wear resistance of the coating. It is suitable for tobacco transfer paper under high wear conditions and ensures its excellent performance in light and high temperature environments.

[0043] Multifunctional properties of functional filler coatings: By adding graphene, titanium boride fiber, barium titanate microspheres, polytetrafluoroethylene (PTFE) micro powder and high-density polyethylene (HDPE) microparticles, the mechanical strength, conductivity and lubricity of the coating are enhanced, making the coating perform well in high-friction and complex environments, and suitable for the multifunctional application needs of tobacco transfer paper.

[0044] Rapid curing and high hardness of surface hardening coating: Photoinitiator, UV-curable acrylate resin, pyrrolidone, trimethylolpropane triacrylate (TMPTA) and divinylbenzene are added to the coating, which is rapidly cured by UV light irradiation to form a high-hardness surface coating, suitable for the rapid processing requirements of tobacco transfer paper in high-abrasion environments.

[0045] High comprehensive performance of organic-inorganic hybrid coating: By introducing organosilicon resin, sodium silicate sol, hydroxyl silicone oil, silane coupling agent, tetraethyl orthosilicate (TEOS) and titanium dioxide nanoparticles into the coating, an organic-inorganic hybrid structure is formed. The coating has high hardness, chemical resistance and good flexibility, and is particularly suitable for tobacco transfer paper that requires high durability and environmental stress resistance. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] An embodiment of the present invention provides a transfer coating for improving the abrasion resistance of tobacco transfer paper. The transfer coating comprises the following components and their weight percentages:

[0048] Polyurethane (PU) resin 35-45%, acrylate resin 15-25%, epoxy resin 10-15%, self-healing microcapsules 7-12%, solvent 10-20%, additives 2-5%, nano silver particles 0.5-1%;

[0049] Self-healing microcapsules contain the following components:

[0050] The shell material is 50-60% polylactic acid-polyglycolic acid copolymer (PLGA);

[0051] The core material is a complex containing 5-10% silica nanoparticles, 30-40% polydimethylsiloxane (PDMS), 20-30% epoxy resin, and 1-2% antioxidant vitamin E.

[0052] The stabilizer is chitosan, 3-5%;

[0053] The emulsifier is polyethylene glycol (PEG), 1-3%;

[0054] The reinforcing agent is carbon nanotubes (CNTs), 2-3%;

[0055] The microcapsules are prepared via a two-emulsion method, with a shell material encapsulating a core material to form microcapsules with a diameter of 0.5-2 micrometers. When subjected to external force, the microcapsules rupture, releasing a self-healing agent for surface repair. The coating is then baked at 80-100°C for 40-70 minutes to cure into a film.

[0056] The transfer coating also includes the following components and their weight percentages: 1-3% nano-titanium dioxide, 1-2% nano-boron nitride, 0.5-1.5% nano-zirconia, 2-4% polymethyl methacrylate (PMMA) microspheres, and 0.5-1% triethanolamine. The nanomaterials are uniformly dispersed in the coating using high-speed shear dispersion technology, significantly improving the coating's wear resistance and mechanical strength. The PMMA microspheres provide additional smoothness and abrasion resistance, while triethanolamine acts as a stabilizer and dispersant, ensuring the uniform distribution of the nanomaterials.

[0057] The transfer coating also includes the following components and their weight percentages: graphene 0.5-1%, titanium boride fibers 1-2%, barium titanate microspheres 1-2%, polytetrafluoroethylene (PTFE) micropowder 0.5-1%, and high-density polyethylene (HDPE) microparticles 1-2%. Functional fillers are uniformly mixed in the coating, significantly improving the coating's abrasion resistance, conductivity, and mechanical strength. Graphene provides excellent conductivity, titanium boride fibers and barium titanate microspheres enhance abrasion resistance, and PTFE micropowder and HDPE microparticles provide additional lubricity and mechanical strength.

[0058] The transfer coating also includes the following components and their weight percentages: photoinitiator 1-2%, UV-curable acrylate resin 5-10%, pyrrolidone 0.5-1%, trimethylolpropane triacrylate (TMPTA) 3-5%, and divinylbenzene 1-2%. The coating cures rapidly under UV light, forming a high-hardness surface coating. The photoinitiator and pyrrolidone promote the UV curing reaction, while TMPTA and divinylbenzene provide higher crosslinking density and mechanical strength, significantly improving the coating's abrasion resistance.

[0059] The transfer coating also includes the following components and their weight percentages: 5-10% silicone resin, 3-5% sodium silicate sol, 1-2% hydroxyl silicone oil, 0.5-1% silane coupling agent, 2-3% tetraethyl orthosilicate (TEOS), and 0.5-1% titanium dioxide nanoparticles. The silicone resin and inorganic sodium silicate sol are blended via a sol-gel method to form an organic-inorganic hybrid structure. The hydroxyl silicone oil provides additional flexibility, the silane coupling agent enhances the bonding force between the organic and inorganic components, and TEOS and titanium dioxide nanoparticles further improve the coating's hardness and chemical resistance.

[0060] A method for preparing a transfer coating to improve the abrasion resistance of tobacco transfer paper.

[0061] Step 1: Preparation of self-healing microcapsules

[0062] 1.1 Dissolving the shell material: Dissolve 50% to 60% of polylactic acid-polyglycolic acid copolymer in dichloromethane and stir until homogeneous to form a PLGA solution;

[0063] 1.2 Preparation of core material: 5% to 10% silica nanoparticles, 30% to 40% polydimethylsiloxane, 20% to 30% epoxy resin and 1% to 2% vitamin E are mixed evenly to form core material;

[0064] 1.3 Emulsifying the primary emulsion: The core material is slowly added to the PLGA solution and a primary emulsion is formed under high-speed stirring. 3% to 5% chitosan and 1% to 3% polyethylene glycol are added as stabilizers and emulsifiers, and stirring is continued.

[0065] 1.4 Microcapsule formation: The colostrum was added dropwise to a 0.5% to 1% polyvinyl alcohol aqueous solution, and the phase was separated by continuous stirring to form microcapsules; the microcapsules were separated by centrifugation, washed and dried to obtain self-healing microcapsules with a diameter of 0.5 to 2 micrometers;

[0066] Step 2: Preparation of nanomaterial-reinforced matrix liquid

[0067] 2.1 Dispersing nanomaterials: 1% to 3% nano-titanium dioxide, 1% to 2% nano-boron nitride, and 0.5% to 1.5% nano-zirconia are dispersed in ethanol by ultrasonic dispersion to form a nanomaterial dispersion.

[0068] 2.2 Mixed base solution: Add 2% to 4% of polymethyl methacrylate microspheres and 0.5% to 1% of triethanolamine to the nanomaterial dispersion, and mix evenly under high-speed shearing to form a nanomaterial reinforced base solution;

[0069] Step 3: Preparation of functional filler base liquid

[0070] 3.1 Mixed filler: 0.5% to 1% graphene, 1% to 2% titanium boride fiber, 1% to 2% barium titanate microspheres, 0.5% to 1% polytetrafluoroethylene micro powder and 1% to 2% high-density polyethylene microparticles are mixed;

[0071] 3.2 Preparation of base solution: The above filler mixture is gradually added to the nanomaterial-reinforced base solution obtained in step 2.2 while stirring to form a functional filler base solution;

[0072] Step 4: Prepare surface hardening base liquid

[0073] 4.1 Addition of photoinitiator: Add 1% to 2% photoinitiator, 5% to 10% UV-curable acrylate resin, 0.5% to 1% pyrrolidone, 3% to 5% trimethylolpropane triacrylate and 1% to 2% divinylbenzene to the functional filler base liquid, stir evenly to form a surface-hardening base liquid;

[0074] Step 5: Preparation of organic-inorganic hybrid base liquid

[0075] 5.1 Organic-inorganic hybridization: Add 5% to 10% organosilicon resin, 3% to 5% sodium silicate sol, 1% to 2% hydroxyl silicone oil, 0.5% to 1% silane coupling agent, 2% to 3% tetraethyl orthosilicate and 0.5% to 1% titanium dioxide nanoparticles to the surface hardening base liquid, stir evenly to form an organic-inorganic hybrid base liquid;

[0076] Step 6: Prepare the final coating

[0077] 6.1 Adding self-healing microcapsules: Slowly add 7% to 12% of the self-healing microcapsules prepared in step 1 to the organic-inorganic hybrid base liquid, stirring at low speed to avoid microcapsule rupture;

[0078] 6.2 Mixing the coating base liquid: Mix the above mixture with 35% to 45% polyurethane resin, 15% to 25% acrylic resin and 10% to 15% epoxy resin, and stir until uniform; add 0.5% to 1% nano silver particles, and continue stirring to form the final coating.

[0079] Step 7: Coating and Curing

[0080] 7.1 Coating process: The final coating is uniformly coated on the surface of the tobacco transfer paper using a scraping, spraying, or dip coating process to ensure uniform coating.

[0081] 7.2 Curing process: The coated transfer paper is baked at 80 to 100 degrees Celsius for 40 to 70 minutes to allow the coating to fully cure into a film, thus completing the preparation.

[0082] It should be noted that: in this invention, polyurethane (PU) resin accounts for 35-45%, acrylate resin 15-25%, epoxy resin 10-15%, self-healing microcapsules 7-12%, solvent 10-20%, additives 2-5%, and nano-silver particles 0.5-1%. Polyurethane resin provides flexibility and good adhesion in coatings and is often used to improve abrasion resistance. For example, in automotive coatings, the polyurethane content is typically between 30-50% to ensure the coating's flexibility and impact resistance. A proportion of 35-45% ensures that the coating maintains flexibility while possessing sufficient strength and elasticity, suitable for the abrasion resistance requirements of tobacco transfer paper. Acrylic resin, due to its excellent weather resistance and chemical resistance, is widely used in protective coatings. For example, in architectural coatings, the acrylic resin content is typically between 20-30% to provide good UV resistance and water resistance. A proportion of 15-25% enhances the coating's durability, complementing the polyurethane resin and suitable for improving the abrasion resistance of tobacco transfer paper. Epoxy resin provides strong adhesion and chemical resistance. Corrosion resistance is assessed, and the content in anti-corrosion coatings is typically between 10% and 20% to ensure coating adhesion and durability; a proportion of 10% to 15% enhances coating adhesion without affecting its flexibility, suitable for the specific needs of tobacco transfer paper; solvents are used to adjust the viscosity and flowability of the coating, for example, in industrial coatings, the solvent content is typically between 20% and 30% to ensure good workability; a proportion of 10% to 20% can provide appropriate coating performance and curing effect; additives are used to improve the leveling, dispersibility, and antistatic properties of the coating, for example, in industrial coatings, the additive content is typically between 1% and 5% to provide the necessary functions; a proportion of 2% to 5% can effectively improve the workability and surface properties of the coating, suitable for the coating requirements of tobacco transfer paper; nano-silver particles provide antibacterial and enhanced conductivity, for example, in antibacterial coatings, the content of nano-silver particles is typically between 0.1% and 1% to ensure antibacterial effect; a proportion of 0.5% to 1% provides the necessary antibacterial properties without affecting the transparency and other properties of the coating.

[0083] Self-healing microcapsules comprise the following components: a shell material of 50-60% polylactic acid-polyglycolic acid copolymer (PLGA); a core material of a complex containing 5-10% silica nanoparticles, 30-40% polydimethylsiloxane (PDMS), 20-30% epoxy resin, and 1-2% antioxidant vitamin E; a stabilizer of 3-5% chitosan; an emulsifier of 1-3% polyethylene glycol (PEG); and a reinforcing agent of 2-3% carbon nanotubes (CNTs). These self-healing microcapsules release their internal repair agents when the coating is damaged, achieving self-repair. For example, in smart coatings, the content of self-healing microcapsules is typically 5-10%. Between 5% and 5% to ensure sufficient repair capability; a ratio of 7% to 12% provides sufficient self-healing effect while maintaining the overall performance of the coating, suitable for improving the abrasion resistance of tobacco transfer paper; polylactic acid-polyglycolic acid copolymer is used to form the shell of microcapsules, providing biodegradability and good mechanical strength. In drug controlled-release systems, the PLGA content is typically between 50% and 70% to ensure the stability of microcapsules; a ratio of 50% to 60% can form a stable microcapsule shell, suitable for self-healing coatings; the core material contains 5% to 10% silica nanoparticles, 30% to 40% PDMS, and epoxy resin. The core material, containing 20-30% lipids and 1-2% vitamin E, provides repair and antioxidant properties. For example, in self-healing coatings, the core material combination typically includes 5-15% nanoparticles and 30-50% PDMS to provide effective repair. This ratio ensures the microcapsules effectively release the repair agent when damaged, making it suitable for improving the abrasion resistance of tobacco transfer paper. Chitosan, as a natural polymeric stabilizer, provides good biocompatibility and stability. In drug delivery systems, the chitosan content is typically between 2-5% to ensure the stability and uniform distribution of the microcapsules; a ratio of 3-5% effectively stabilizes the microcapsules. Microcapsules ensure uniform dispersion in coatings; polyethylene glycol (PEG), as an emulsifier, provides good emulsification and biocompatibility. In emulsification systems, the PEG content is typically between 1% and 5% to ensure stable emulsification; a ratio of 1% to 3% effectively emulsifies microcapsules and improves their dispersibility in coatings; carbon nanotubes, as a reinforcing agent, significantly improve the mechanical strength and electrical conductivity of coatings. In high-performance composites, the carbon nanotube content is typically between 1% and 5% to provide significant reinforcing effects; a ratio of 2% to 3% can improve the strength of the coating without affecting its flexibility and other properties.

[0084] The transfer coating also includes the following components and their weight percentages: 1-3% nano-titanium dioxide, 1-2% nano-boron nitride, 0.5-1.5% nano-zirconia, 2-4% polymethyl methacrylate (PMMA) microspheres, and 0.5-1% triethanolamine. The nanomaterials are uniformly dispersed in the coating using high-speed shear dispersion technology, significantly improving the coating's wear resistance and mechanical strength. PMMA microspheres provide additional smoothness and abrasion resistance, while triethanolamine acts as a stabilizer and dispersant, ensuring the uniform distribution of the nanomaterials. Nano-titanium dioxide provides excellent photocatalytic and reinforcing properties; for example, in self-cleaning coatings, the content of nano-titanium dioxide is typically between 1-5% to ensure good photocatalytic effects. A proportion of 1-3% can enhance the coating's wear resistance and photocatalytic performance, suitable for improving the abrasion resistance of tobacco transfer paper. Nano-boron nitride provides excellent thermal conductivity and lubrication properties; for example, in lubricating coatings, the content of nano-boron nitride is typically between 0.5-2% to ensure good lubrication effects. A 1-2% concentration enhances the thermal conductivity and lubrication of the coating, suitable for the specific needs of tobacco transfer paper; nano-zirconia provides excellent abrasion resistance and mechanical properties; for example, in abrasion-resistant coatings, the content of nano-zirconia is typically between 0.5% and 2% to ensure good abrasion resistance; a 0.5-1.5% concentration significantly improves the abrasion resistance of the coating, suitable for the abrasion resistance requirements of tobacco transfer paper; PMMA microspheres provide excellent smoothness and mechanical properties; for example, in coatings, the content of PMMA microspheres is typically between 2% and 5% to ensure good smoothness; a 2-4% concentration improves the smoothness and abrasion resistance of the coating, suitable for enhancing the surface properties of tobacco transfer paper; triethanolamine, as a stabilizer and dispersant, improves the dispersibility and stability of the coating; for example, in coatings, the content of triethanolamine is typically between 0.5% and 2% to ensure good dispersion; a 0.5-1% concentration ensures the uniform distribution of nanomaterials in the coating, improving the coating performance.

[0085] The transfer coating also includes the following components and their weight percentages: graphene 0.5 to 1%, titanium boride fiber 1 to 2%, barium titanate microspheres 1 to 2%, polytetrafluoroethylene (PTFE) micropowder 0.5 to 1%, and high-density polyethylene (HDPE) microparticles 1 to 2%. Functional fillers are uniformly mixed in the coating, significantly improving the coating's abrasion resistance, conductivity, and mechanical strength. Graphene provides excellent conductivity and mechanical strength; for example, in conductive coatings, the graphene content is typically between 0.1% and 2% to ensure good conductivity. A proportion of 0.5% to 1% can significantly improve the coating's conductivity and mechanical strength, suitable for enhancing the overall performance of tobacco transfer paper. Titanium boride fiber provides excellent abrasion resistance and reinforcing properties; for example, in high-performance coatings, the titanium boride fiber content is typically between 0.5% and 3% to ensure good abrasion resistance. A proportion of 1% to 2% can significantly improve the coating's abrasion resistance and mechanical strength, suitable for tobacco... The abrasion resistance requirements of transfer paper; barium titanate microspheres provide excellent electrical insulation and mechanical properties. For example, in electrically insulating coatings, the content of barium titanate microspheres is typically between 0.5% and 3% to ensure good electrical insulation effects; a proportion of 1% to 2% can improve the mechanical strength and abrasion resistance of the coating, suitable for improving the overall performance of tobacco transfer paper; PTFE micropowder provides excellent lubrication and abrasion resistance. For example, in lubricating coatings, the content of PTFE micropowder is typically between 0.5% and 2% to ensure good lubrication effects; a proportion of 0.5% to 1% can improve the lubricity and abrasion resistance of the coating, suitable for improving the surface properties of tobacco transfer paper; HDPE microparticles provide excellent mechanical and lubrication properties. For example, in high-performance coatings, the content of HDPE microparticles is typically between 1% and 3% to ensure good mechanical strength; a proportion of 1% to 2% can improve the mechanical strength and lubricity of the coating, suitable for improving the overall performance of tobacco transfer paper;

[0086] The transfer coating also includes the following components and their weight percentages: 1-2% photoinitiator, 5-10% UV-curable acrylate resin, 0.5-1% pyrrolidone, 3-5% trimethylolpropane triacrylate (TMPTA), and 1-2% divinylbenzene. The coating cures rapidly under UV light, forming a high-hardness surface coating. The photoinitiator promotes the UV curing reaction; for example, in UV-curable coatings, the photoinitiator content is typically between 0.5% and 3% to ensure rapid curing. A proportion of 1-2% ensures rapid curing of the coating under UV light, forming a high-hardness surface. The UV-curable acrylate resin provides excellent hardness and abrasion resistance; for example, in UV-curable coatings, the acrylate resin content is typically between 5% and 15% to ensure good abrasion resistance. A proportion of 5-10% improves the hardness and abrasion resistance of the coating, suitable for enhancing the hardness of tobacco transfer paper. Surface properties; Pyrrolidone, as a solvent and dispersant, provides good dispersion and solubility. For example, in coatings, the content of pyrrolidone is usually between 0.5% and 2% to ensure good dispersion; a proportion of 0.5% to 1% can ensure uniform distribution of components in the coating and improve coating performance; TMPTA provides high crosslinking density and mechanical properties. For example, in UV-cured coatings, the content of TMPTA is usually between 3% and 10% to ensure high crosslinking density; a proportion of 3% to 5% can improve the mechanical strength and abrasion resistance of the coating, suitable for improving the surface properties of tobacco transfer paper; Divinylbenzene provides high crosslinking density and chemical resistance. For example, in high-performance coatings, the content of divinylbenzene is usually between 1% and 5% to ensure high crosslinking density; a proportion of 1% to 2% can improve the mechanical strength and chemical resistance of the coating, suitable for improving the overall performance of tobacco transfer paper;

[0087] The transfer coating also includes the following components and their weight percentages: 5-10% silicone resin, 3-5% sodium silicate sol, 1-2% hydroxyl silicone oil, 0.5-1% silane coupling agent, 2-3% tetraethyl orthosilicate (TEOS), and 0.5-1% titanium dioxide nanoparticles. Silicone resin provides excellent flexibility and heat resistance; for example, in high-temperature coatings, the content of silicone resin is typically between 5-15% to ensure good heat resistance. A proportion of 5-10% can improve the flexibility and heat resistance of the coating, suitable for enhancing the overall performance of tobacco transfer paper. Sodium silicate sol provides excellent mechanical and chemical properties; for example, in inorganic coatings, the content of sodium silicate sol is typically between 3-10% to ensure good mechanical strength. A proportion of 3-5% can improve the mechanical strength and chemical resistance of the coating, suitable for enhancing the overall performance of tobacco transfer paper. Hydroxyl silicone oil provides excellent flexibility and lubricity; for example, in lubricating coatings, the content of hydroxyl silicone oil is typically between 1-5% to ensure good lubrication. A 1-2% concentration can improve the flexibility and lubricity of the coating, suitable for enhancing the surface properties of tobacco transfer paper; silane coupling agents are used to enhance the bonding force between organic and inorganic components. For example, in composite materials, the content of silane coupling agents is typically between 0.5% and 2% to ensure good bonding; a 0.5-1% concentration can improve the bonding strength and overall performance of the coating, suitable for enhancing the surface properties of tobacco transfer paper; TEOS provides excellent hardness and chemical resistance. For example, in high-performance coatings, the content of TEOS is typically between 2% and 5% to ensure good hardness; a 2-3% concentration can improve the hardness and chemical resistance of the coating, suitable for enhancing the surface properties of tobacco transfer paper; titanium dioxide nanoparticles provide excellent mechanical and photocatalytic properties. For example, in self-cleaning coatings, the content of titanium dioxide nanoparticles is typically between 0.5% and 2% to ensure good photocatalytic effect; a 0.5-1% concentration can improve the mechanical strength and photocatalytic performance of the coating, suitable for enhancing the overall performance of tobacco transfer paper.

[0088] It should also be noted that:

[0089] The transfer coating of this invention comprises a combination of polyurethane (PU) resin, acrylic resin, and epoxy resin, providing flexibility, adhesion, and abrasion resistance. In particular, it incorporates self-healing microcapsules, which release repair agents when the coating is damaged, enabling the coating to self-repair. The flexibility and adhesion of the PU resin ensure the coating is not easily detached while providing a certain degree of abrasion resistance. The acrylic resin increases the coating's weather resistance and chemical resistance, maintaining stability under various environmental conditions. The addition of epoxy resin further improves the coating's mechanical strength and abrasion resistance. The self-healing microcapsules, encapsulated within the coating, rupture when the coating is damaged by external forces, releasing internal repair agents such as polydimethylsiloxane (PDMS) and epoxy resin to quickly repair coating cracks and ensure long-term durability. Compared to traditional coatings, coatings containing self-healing microcapsules effectively extend service life, making them particularly suitable for tobacco transfer papers susceptible to mechanical damage during processing and use.

[0090] This invention further incorporates nanomaterials such as nano-titanium dioxide, nano-boron nitride, and nano-zirconia into the transfer coating. These nanomaterials are uniformly distributed throughout the coating using ultrasonic dispersion technology, significantly improving the coating's wear resistance and mechanical strength. Nano-titanium dioxide not only enhances the coating's hardness but also possesses photocatalytic properties, enabling it to degrade organic matter under light conditions and maintain surface cleanliness. Nano-boron nitride provides excellent thermal conductivity and lubricity, reducing the coefficient of friction at high temperatures and improving the coating's performance in high-temperature environments. Nano-zirconia, with its high hardness and wear resistance, is widely used in coatings requiring high wear resistance. Through synergistic effects with other nanomaterials, it significantly improves the overall performance of the coating. Compared to common filler materials, this combination of nanomaterials not only enhances the coating's hardness and wear resistance but also retains good flexibility and adhesion, making the coating suitable for the specific needs of tobacco transfer paper.

[0091] The transfer coating of this invention also incorporates functional fillers such as graphene, titanium boride fibers, barium titanate microspheres, polytetrafluoroethylene (PTFE) micropowder, and high-density polyethylene (HDPE) microparticles. Graphene plays a crucial role in the coating due to its excellent conductivity and mechanical strength, enhancing its electrical and mechanical properties. Titanium boride fibers increase the coating's hardness and abrasion resistance, enabling it to perform exceptionally well in high-friction environments. Barium titanate microspheres provide good electrical insulation and high mechanical strength, resulting in excellent performance in electrical applications. PTFE micropowder, with its extremely low coefficient of friction, imparts good lubricity to the coating, making it suitable for use in high-friction environments. HDPE microparticles enhance the coating's toughness and abrasion resistance. Through the combined effect of these fillers, the coating exhibits excellent performance in abrasion resistance, conductivity, and lubricity, making it particularly suitable for tobacco transfer paper used in high-friction and complex environments. Compared to traditional functional fillers, the combination of these materials significantly improves the coating's multifunctional performance, meeting the application requirements in complex environments.

[0092] In this invention, the transfer coating incorporates a photoinitiator, UV-curable acrylate resin, pyrrolidone, trimethylolpropane triacrylate (TMPTA), and divinylbenzene, enabling rapid curing under UV light to form a high-hardness surface coating. The photoinitiator activates the curing reaction under UV light, allowing the coating to quickly solidify. The UV-curable acrylate resin provides rapid curing and high hardness, significantly improving the coating's abrasion resistance. TMPTA, as a trifunctional monomer, increases the coating's crosslinking density, enhancing its mechanical strength and abrasion resistance. Pyrrolidone improves the coating's flowability and application properties, ensuring uniform coating distribution. Divinylbenzene, through its double-bond structure, enhances the coating's chemical resistance and hardness. Compared to traditional thermosetting coatings, UV-curable coatings not only cure quickly but also have high surface hardness, making them suitable for forming a highly abrasion-resistant protective layer in a short time, particularly applicable to tobacco transfer paper applications in high-abrasion environments. These components work synergistically to achieve excellent performance in terms of hardness, abrasion resistance, and chemical resistance.

[0093] The transfer coating of this invention further comprises organosilicon resin, sodium silicate sol, hydroxyl silicone oil, silane coupling agent, tetraethyl orthosilicate (TEOS), and titanium dioxide nanoparticles, blended via a sol-gel method to form an organic-inorganic hybrid structure. The organosilicon resin provides excellent flexibility and heat resistance, ensuring the coating remains stable at high temperatures. Sodium silicate sol and TEOS increase the coating's hardness and chemical resistance, resulting in excellent performance in complex chemical environments. The hydroxyl silicone oil improves the coating's flexibility and lubricity, making it suitable for use under dynamic loads. The silane coupling agent enhances the organic... The bonding strength between the coating and inorganic components improves the overall performance of the coating; the introduction of titanium dioxide nanoparticles further enhances the mechanical strength and chemical corrosion resistance of the coating; compared with pure organic or pure inorganic coatings, organic-inorganic hybrid coatings, through the synergistic effect of organic and inorganic components, possess both high hardness and chemical resistance, while retaining good flexibility and adhesion, making them particularly suitable for tobacco transfer paper applications requiring high durability and resistance to environmental stress; through scientific combination and ratio optimization, these components enable the coating to exhibit excellent comprehensive performance, meeting the needs of various complex application scenarios.

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A transfer coating to improve the rub resistance of a tobacco transfer paper, characterized in that, The transfer coating includes the following components and their weight percentages: Polyurethane resin 35-45%, acrylic ester resin 15-25%, epoxy resin 10-15%, self-repairing microcapsule 7-12%, solvent 10-20%, auxiliary agent 2-5%, nano-silver particles 0.5-1%; The self-repairing microcapsule includes the following components: The shell material is polylactic acid-polyglycolic acid copolymer 50-60%; The core material is a compound containing silica nanoparticles 5-10%, polydimethylsiloxane 30-40%, epoxy resin 20-30%, and 1-2% antioxidant vitamin E; The stabilizer is chitosan 3-5%; The emulsifier is polyethylene glycol 1-3%; The reinforcing agent is carbon nanotube 2-3%; The microcapsule is prepared by a double emulsion method, the shell material coats the core material, forming a microcapsule with a diameter of 0.5-2 microns.

2. A transfer coating to improve the rub resistance of a tobacco transfer paper according to claim 1, characterized in that: The transfer coating includes the following components and their weight percentages: nano-titanium dioxide 1-3%, nano-boron nitride 1-2%, nano-zirconium oxide 0.5-1.5%, polymethyl methacrylate microspheres 2-4%, triethanolamine 0.5-1%.

3. A transfer coating to improve the rub resistance of a tobacco transfer paper according to claim 2, characterized in that: The transfer coating includes the following components and their weight percentages: graphene 0.5-1%, titanium boride fiber 1-2%, barium titanate microspheres 1-2%, polytetrafluoroethylene micro powder 0.5-1%, high-density polyethylene particles 1-2%.

4. A transfer coating to improve the rub resistance of a tobacco transfer paper according to claim 3, characterized in that: The transfer coating includes the following components and their weight percentages: photoinitiator 1-2%, UV-curable acrylic ester resin 5-10%, pyrrolidone 0.5-1%, trimethylolpropane triacrylate 3-5%, divinylbenzene 1-2%.

5. The transfer coating for improving the scratch resistance of tobacco transfer paper according to claim 4, wherein the transfer coating includes the following components and their weight percentages: silicone resin 5-10%, sodium silicate sol 3-5%, hydroxyl silicone oil 1-2%, silane coupling agent 0.5-1%, ethyl silicate 2-3%, and titanium oxide nanoparticles 0.5-1%.

6. The transfer coating for improving the scratch resistance of tobacco transfer paper according to claim 5, further comprising a preparation method of a transfer coating for improving the scratch resistance of tobacco transfer paper, characterized by: Step 1: preparing self-repairing microcapsules 1.1 Dissolve the shell material: dissolve polylactic acid-polyglycolic acid copolymer 50-60% in dichloromethane, stir evenly to form a PLGA solution; 1.2 Prepare the core material: mix silica nanoparticles 5-10%, polydimethylsiloxane 30-40%, epoxy resin 20-30%, and vitamin E 1-2% evenly to form the core material; 1.3 Emulsify the initial milk: slowly add the core material to the PLGA solution under high-speed stirring to form the initial milk, add chitosan 3-5% and polyethylene glycol 1-3% as stabilizer and emulsifier, and continue stirring; 1.4 Form microcapsules: add the initial milk drop by drop into 0.5-1% polyvinyl alcohol aqueous solution, continuously stir for phase separation to form microcapsules; centrifuge the microcapsules, wash and dry to obtain self-repairing microcapsules with a diameter of 0.5-2 microns; Step 2: prepare nano-material reinforced base solution 2.1 Disperse nanomaterials: disperse 1% to 3% of nanometer titanium dioxide, 1% to 2% of nanometer boron nitride, and 0.5% to 1.5% of nanometer zirconium oxide in ethanol by ultrasonic dispersion method to form a nanomaterial dispersion solution; 2.2 Mix base liquid: add the nanomaterial dispersion solution to 2% to 4% of polymethyl methacrylate microspheres and 0.5% to 1% of triethanolamine, mix uniformly under high-speed shearing to form a nanomaterial enhanced base liquid; Step 3: Prepare functional filler base liquid 3.1 Mix fillers: mix 0.5% to 1% of graphene, 1% to 2% of titanium boride fibers, 1% to 2% of barium titanate microspheres, 0.5% to 1% of polytetrafluoroethylene micro powder, and 1% to 2% of high-density polyethylene microparticles; 3.2 Prepare base liquid: gradually add the above filler mixture to the nanomaterial enhanced base liquid obtained in step 2.2, stir while adding, and form a functional filler base liquid; Step 4: Prepare surface hardening base liquid 4.1 Add photoinitiator: add 1% to 2% of photoinitiator, 5% to 10% of UV-curable acrylate resin, 0.5% to 1% of pyrrolidone, 3% to 5% of trimethylolpropane triacrylate, and 1% to 2% of divinylbenzene to the functional filler base liquid, stir uniformly to form a surface hardening base liquid; Step 5: Prepare organic-inorganic hybrid base liquid 5.1 Organic-inorganic mixing: add 5% to 10% of silicone resin, 3% to 5% of sodium silicate sol, 1% to 2% of hydroxyl silicone oil, 0.5% to 1% of silane coupling agent, 2% to 3% of ethyl silicate, and 0.5% to 1% of titanium oxide nanoparticles to the surface hardening base liquid, stir uniformly to form an organic-inorganic hybrid base liquid; Step 6: Prepare the final coating 6.1 Add self-repairing microcapsules: slowly add 7% to 12% of self-repairing microcapsules prepared in step 1 to the organic-inorganic hybrid base liquid, stir at low speed to avoid microcapsule rupture; 6.2 Mix coating base liquid: mix the above mixture with 35% to 45% of polyurethane resin, 15% to 25% of acrylate resin, and 10% to 15% of epoxy resin, stir uniformly; add 0.5% to 1% of nanometer silver particles, continue stirring to form the final coating; Step 7: Coating and curing 7.1 Coating process: uniformly coat the final prepared coating on the surface of the tobacco transfer paper, use the blade coating, spraying or dipping coating process to ensure uniform coating; 7.2 Curing process: bake the coated transfer paper at 80 to 100 degrees Celsius for 40 to 70 minutes to fully cure the coating into a film, complete the preparation.