Outdoor high-weather-resistance heat sublimation re-transfer printing film and preparation method thereof

Abstract

The invention relates to the technical field of thermal dye sublimation re-transfer printing, in particular to an outdoor high-weather-resistance thermal dye sublimation re-transfer printing film and a preparation method of the outdoor high-weather-resistance thermal dye sublimation re-transfer printing film. The re-transfer film includes a reactive dye receiving layer on a release layer; the reactive dye receiving layer comprises receiving layer main resin, a reactive substance ultraviolet absorbent and a light stabilizer; the receiving layer main resin comprises a vinyl chloride-vinyl acetate copolymer and chlorinated polyether resin, and the reactive substance comprises an isocyanate cross-linking agent and a zirconium ion complexing agent. The reactive dye receiving layer is arranged, reactive substances in the reactive dye receiving layer can achieve chemical stability, an ultraviolet absorbent and a light stabilizer have the physical protection effect, and the ultraviolet absorbent and the light stabilizer cooperate so that the thermal sublimation re-transfer film can be well applied outdoors; and the paint also has a good waterproof effect and good adhesive force.

Description

Technical Field

[0001] This invention relates to the field of thermal sublimation retransfer technology, and more specifically, to a high weather-resistant thermal sublimation retransfer film for outdoor use and its preparation method. Background Technology

[0002] Dye-sublimation printing has unique advantages in outdoor advertising and signage due to its high color fidelity. However, the small molecular structure of dyes, mainly azo and anthraquinone, is easily degraded by ultraviolet light, temperature and humidity. Furthermore, the traditional coating of transfer film uses materials such as chloroacetic acid resin and ordinary acrylic resin, resulting in poor weather resistance and lack of waterproof design. At the same time, the rough surfaces and uneven ink absorption of commonly used outdoor substrates such as Xuan paper, silk cloth and inkjet cloth further exacerbate the problems of weather resistance and adhesion.

[0003] Existing technologies for improving the weather resistance of thermal sublimation products mainly include surface coating (such as 3M 1170 protective film), improved OC film (adding light stabilizers), and traditional retransfer film (using chloroacetic acid resin as the core coating, improving performance by optimizing resin ratio and adding light stabilizers). However, these solutions have significant limitations: While surface coating offers good weather resistance, it is costly and limited for wide-format applications; improved OC film processes are simple but lack waterproofing and have limited weather resistance; traditional retransfer film, despite optimization, suffers from easily degradable dyes, lacks waterproofing, and has a short outdoor lifespan.

[0004] In addition, dyes are prone to photo-oxidation or photo-reduction reactions in outdoor applications. After 3 months of exposure, the fading rate exceeds 30% and the color difference ΔE is greater than 15. The coating is prone to cracking and peeling in high temperature and high humidity environments, and rainwater directly contacting the dye layer will accelerate fading and loss, which cannot meet the needs of long-term use of outdoor advertising signs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an outdoor high weather resistance thermal sublimation retransfer film and its preparation method.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: This invention provides an outdoor high weather resistance thermal sublimation retransfer film, comprising a substrate layer and a release layer located on the substrate layer, and further comprising a reactive dye receiving layer located on the release layer; The reactive dye receiving layer comprises a main resin for the receiving layer, a reactive substance ultraviolet absorber, and a light stabilizer. The main resin of the receiving layer includes vinyl chloride-vinyl acetate copolymer and chloroether resin, and the reactive substances include isocyanate crosslinking agents and zirconium ion complexing agents.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the mass of the reactive substance is 5%-8% of the main resin of the receiving layer.

[0009] The reactive dye receiving layer also includes a receiving layer auxiliary resin, which includes an adhesion promoting resin and an anti-sticking resin.

[0010] Furthermore, the adhesion-promoting resin is chlorinated polypropylene resin and / or polyester resin, and the anti-sticking resin is silicone resin.

[0011] Furthermore, in the reactive dye receiving layer, the mass fractions of each component are as follows: 15-20 parts of vinyl chloride-vinyl acetate copolymer, 5-10 parts of chloroether resin, 1-3 parts of isocyanate crosslinking agent, 0.5-1 part of zirconium ion complexing agent, 1-2 parts of chlorinated polypropylene resin, 0.5-1 part of polyester resin, 0.3-0.5 parts of organosilicon resin, 0.5-1 part of ultraviolet absorber, and 0.3-0.8 parts of light stabilizer.

[0012] Furthermore, the thickness of the reactive dye receiving layer is 5-8 μm.

[0013] Furthermore, a waterproof and moisture-proof protective layer is provided between the reactive dye receiving layer and the release layer. The composition and mass fraction of the waterproof and moisture-proof protective layer are as follows: 3-5 parts of fluorocarbon resin and 0.5-1 parts of hydrophobic nano-silica. The particle size of the hydrophobic nano-silica is 15-25 nm.

[0014] Furthermore, the thickness of the waterproof and moisture-proof protective layer is 0.8-1.2 μm.

[0015] This invention also provides a method for preparing the outdoor high-weather-resistant thermal sublimation retransfer film as described above, characterized by comprising the following steps: S1. Perform corona treatment on the surface of the substrate layer, and then prepare the release layer; S2. Prepare a reactive dye receiving layer coating solution containing the main resin of the receiving layer and the reactive substance; S3. The reactive dye receiving layer coating solution is coated onto the release layer and dried at 110-120℃ for 35-45s to obtain the reactive dye receiving layer. S4. The film is aged for 20-30 hours at 20-30℃ and 45%-55% humidity to obtain the outdoor high weather resistance heat sublimation retransfer film.

[0016] Furthermore, in step S2, the reactive dye receiving layer coating solution is prepared by mixing each component with a solvent and then ultrasonically dispersing and stirring; the solvent is 2-butanone and toluene in a mass ratio of 1:1.

[0017] The beneficial effects of this invention are as follows: (1) The outdoor high weather resistance thermal sublimation retransfer film of the present invention, by setting a reactive dye receiving layer, wherein the reactive substances can achieve chemical stability, and the ultraviolet absorber and light stabilizer have the effect of physical protection. The two work together to enable the thermal sublimation retransfer film to be well used in outdoor applications. (2) The outdoor high weather resistance heat sublimation retransfer film of the present invention has isocyanate crosslinking agents that can crosslink with the hydroxyl / amino groups of dye molecules, and zirconium ion complexing agents that can form complexes with anthraquinone dyes; (4) The outdoor high weather resistance heat sublimation retransfer film of the present invention has a waterproof and moisture-proof protective layer that achieves a waterproof rating of IPX5 or higher through a composite system of fluorocarbon resin and nano silica, effectively blocking the loss of dye caused by rainwater erosion and filling the gap of traditional retransfer film without waterproof function. (5) The outdoor high weather resistance heat sublimation retransfer film of the present invention can be adapted to a variety of outdoor rough substrates such as silk cloth, inkjet cloth, and Xuan paper, and the adhesion test reaches Grade A with no peeling. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the layer structure of the outdoor high weather resistance thermal sublimation retransfer film of the present invention.

[0019] The attached diagram lists the components represented by each number as follows: 1. Matrix layer; 2. Release layer; 3. Reactive dye receiving layer; 4. Waterproof and moisture-proof protective layer. Detailed Implementation

[0020] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0021] The outdoor high weather-resistant thermal sublimation retransfer film of the present invention includes a substrate layer 1 and a release layer 2 located on the substrate layer 1, and further includes a reactive dye receiving layer 3 located on the release layer 2; the reactive dye receiving layer 3 comprises a receiving layer main resin, a reactive substance ultraviolet absorber and a light stabilizer; the receiving layer main resin comprises vinyl chloride-vinyl acetate copolymer and chloroether resin, and the reactive substance comprises an isocyanate crosslinking agent and a zirconium ion complexing agent.

[0022] The outdoor high weather-resistant thermal sublimation retransfer film of the present invention, by setting a reactive dye receiving layer 3, wherein the reactive substances can achieve chemical stability, and the ultraviolet absorber and light stabilizer have the effect of physical protection, the two work together to enable the thermal sublimation retransfer film to be well used in outdoor applications.

[0023] Regarding the selection of the main resin for the receiving layer, vinyl chloride-vinyl acetate copolymer is the core skeleton material for coating film formation and performance. It can efficiently adsorb and temporarily fix azo and anthraquinone dye molecules during the thermal transfer process, while chloroether resin can improve the compatibility of the matrix layer.

[0024] For reactive substances, the -NCO groups of isocyanate crosslinking agents undergo addition reactions with the hydroxyl (-OH) and amino (-NH2) groups in dye molecules to form crosslinked structures, preventing photooxidative degradation of dye molecules. Zirconium ions form six-membered complexes with the carbonyl (C=O) groups of anthraquinone dyes, enhancing the dye molecules' resistance to photoreduction and significantly reducing the fading rate. The reactive substances of this invention can inhibit photooxidative / photoreduction degradation of dyes at its source.

[0025] UV absorbers preferentially absorb 270-385nm UV light (the main wavelength range for dye degradation), while light stabilizers capture free radicals and block the degradation chain reaction.

[0026] Preferably, the mass of the reactive substance is 5%-8% of the main resin of the receiving layer; this ratio ensures that it reacts fully with the dye without affecting print compatibility.

[0027] Preferably, the vinyl chloride-vinyl acetate copolymer is graded H15 / 42, the chloroether resin is graded MP-25, the isocyanate crosslinking agent is HDI trimer, and the zirconium ion complexing agent is zirconium oxychloride.

[0028] The reactive dye receiving layer 3 of the present invention also includes a receiving layer auxiliary resin, which includes an adhesion promoting resin and an anti-sticking resin; both can effectively improve the adhesion and anti-sticking properties of the reactive dye receiving layer 3, thereby effectively ensuring the transfer effect.

[0029] Preferably, the adhesion promoting resin is chlorinated polypropylene resin and / or polyester resin, and the anti-sticking resin is silicone resin.

[0030] Chlorinated polypropylene resin has excellent affinity for low surface energy substrates, which can effectively enhance the interfacial bonding force with rough outdoor substrates such as silk cloth and inkjet cloth. Further preferred, the adhesion promoting resin is chlorinated polypropylene resin and polyester resin, which have a good synergistic effect, so that the adhesion test reaches the A-level no peeling standard, which solves the problem of easy peeling of traditional retransfer film on complex outdoor substrates.

[0031] As an anti-sticking agent, silicone resin can provide reliable anti-blocking properties during the heat transfer process, ensuring that the pattern is completely transferred without affecting the color reproduction (ΔE<5), while improving the smoothness and wear resistance of the coating surface, and maintaining good process compatibility while ensuring high adhesion.

[0032] Preferably, the grade of chlorinated polypropylene resin is 9122P, the grade of polyester resin is 220, and the silicone resin can be BYK323.

[0033] In the reactive dye receiving layer 3 of the present invention, the mass fractions of each component are as follows: 15-20 parts of vinyl chloride-vinyl acetate copolymer, 5-10 parts of chloroether resin, 1-3 parts of isocyanate crosslinking agent, 0.5-1 part of zirconium ion complexing agent, 1-2 parts of chlorinated polypropylene resin, 0.5-1 part of polyester resin, 0.3-0.5 parts of organosilicon resin, 0.5-1 part of ultraviolet absorber, and 0.3-0.8 parts of light stabilizer.

[0034] Preferably, the ultraviolet absorber is UV-384-2 and the light stabilizer is UV-1130.

[0035] The thickness of the reactive dye receiving layer 3 of the present invention is 5-8 μm, preferably 6 μm.

[0036] In general, the reactive dye receiving layer 3 of the present invention can efficiently receive sublimated dyes and stabilize the dye structure by chemically bonding / complexing the reactive substances with the dyes. At the same time, the reactive dye receiving layer 3 also has the advantages of high lightfastness and high adhesion performance.

[0037] The outdoor high weather-resistant thermal sublimation retransfer film of the present invention has a waterproof and moisture-proof protective layer 4 between the reactive dye receiving layer 3 and the release layer 2. Its core function is to block rainwater and moisture erosion and improve the surface wear resistance, making it especially suitable for long-term outdoor environments.

[0038] The composition and mass fraction of the waterproof and moisture-proof protective layer 4 are as follows: 3-5 parts fluorocarbon resin and 0.5-1 part hydrophobic nano-silica; the particle size of the hydrophobic nano-silica is 15-25 nm; in the above formula, the fluorocarbon resin and the hydrophobic nano-silica work synergistically to achieve water repellency and moisture protection through the low surface energy of the fluorocarbon resin and the dense structure of the nano-silica, enabling the retransfer film to achieve a waterproof rating of IPX5 or higher without affecting the compatibility of heat transfer printing.

[0039] Preferably, the thickness of the waterproof and moisture-proof protective layer 4 is 0.8-1.2μm, and most preferably 1μm.

[0040] The outdoor high weather-resistant heat sublimation retransfer film of the present invention has a substrate layer 1 of PET film, specifically made of polyethylene terephthalate, which can balance mechanical strength and transfer flexibility.

[0041] Preferably, the thickness of the substrate layer 1 is 12-25 μm, and most preferably 15-20 μm.

[0042] The outdoor high weather-resistant thermal sublimation retransfer film of the present invention comprises a release layer 2 containing chloroether resin and chloroacetic acid resin in a mass ratio of 7:3; this resin formulation enables the release layer 2 to achieve both release properties and weather resistance.

[0043] The release layer 2 also includes light stabilizers and free radical scavengers, which have a synergistic effect and can effectively inhibit UV-induced resin degradation.

[0044] Preferably, the composition and mass fraction of the release layer 2 are as follows: 6-8 parts of chloroethyl ether resin, 2-4 parts of chloroacetic acid resin, 0.5-1 parts of light stabilizer, and 0.2-0.5 parts of free radical scavenger. The above composition of the release layer 2 can ensure that the retransfer film has good anti-adhesion properties during thermal sublimation printing, so that it can be easily demolded during transfer, while also having basic weather resistance.

[0045] Preferably, the chloroether resin is VC-40, the chloroacetic acid resin is CP450, the light stabilizer is UV-1130, and the free radical scavenger is grade 123, namely hindered amine light stabilizer (HALS).

[0046] Preferably, the thickness of the release layer 2 is 1-3 μm, and most preferably 2 μm.

[0047] The preparation method of the outdoor high weather-resistant thermal sublimation retransfer film of the present invention includes the following steps: S1. Perform corona treatment on the surface of the substrate layer 1, and then prepare the release layer 2.

[0048] After corona treatment, the surface tension of the substrate layer 1 must be greater than or equal to 38 mN / m. This treatment can improve the adhesion between the substrate layer 1 and the release layer 2, so there is no need to apply an additional primer, which has the advantage of simplifying the process.

[0049] Preferably, the solvent used in the release layer coating liquid is a mixture of 2-butanone and toluene in a mass ratio of 1:1; after mixing each component in the release layer 2 with the solvent, the mixture is stirred and dispersed for 30 minutes until uniform.

[0050] Preferably, the release layer 2 is prepared by applying the release layer coating liquid to the surface of the substrate layer 1 using a 220-mesh anilox roller through a gravure coating method, and drying it at 100-110℃ for 30 seconds to form the release layer 2.

[0051] S2. Prepare a reactive dye receiving layer coating solution containing the receiving layer main resin and reactive substances.

[0052] Preferably, the specific preparation method of the reactive dye receiving layer coating solution is as follows: mix each component with the solvent, ultrasonically disperse for 20 minutes, and then stir for 60 minutes to ensure uniform dispersion of each component.

[0053] Preferably, the solvent is 2-butanone and toluene in a mass ratio of 1:1; the mass fraction of the solvent is 65-75 parts.

[0054] S3. Coat the reactive dye receiving layer coating solution onto the release layer 2 and dry it at 110-120℃ for 35-45s to obtain the reactive dye receiving layer 3.

[0055] Preferably, an 80-mesh anilox roller is used for coating.

[0056] S4. Cure at 20-30℃ and 45%-55% humidity for 20-30 hours to obtain a high weather-resistant thermal sublimation retransfer film for outdoor use; this step ensures that the reactive substances and resin are initially cross-linked, thus improving stability.

[0057] When the retransfer film contains a waterproof and moisture-proof protective layer 4, the waterproof and moisture-proof protective layer 4 is first prepared on the release layer 2, and then a reactive dye receiving layer 3 is prepared on the waterproof and moisture-proof protective layer 4.

[0058] The specific preparation method of the waterproof and moisture-proof protective layer 4 is as follows: the components are mixed with solvent and dispersed evenly to obtain a waterproof and moisture-proof protective layer coating liquid, which is then coated on the surface of the release layer 2 using a 150-mesh anilox roller and dried at 90-100℃ for 20 seconds.

[0059] The solvent used in the waterproof and moisture-proof protective coating liquid is a mixture of ethyl acetate and butanol with a mass ratio of 3:1, and the mass fraction of this mixture is 90-95 parts.

[0060] The present invention will be illustrated below through specific embodiments and comparative examples.

[0061] Example 1 The outdoor high weather-resistant thermal sublimation retransfer film of this embodiment has no waterproof and moisture-proof protective layer 4, and its application environment is mid-term outdoor scene.

[0062] In this embodiment, the substrate layer 1 is a 15μm PET film, which requires corona treatment before preparation.

[0063] The release layer 2 consists of: 7 parts chloroethyl ether resin (VC-40), 3 parts chloroacetic acid resin (CP450), 0.8 parts UV-1130, and 0.3 parts free radical scavenger 123. The solvent used to prepare the coating solution is a mixture of 2-butanone and toluene in a 1:1 mass ratio, totaling 78.9 parts by mass. All the above components are stirred and dispersed for 30 minutes until homogeneous. The mixture is then applied to the surface of the substrate layer 1 using a 220-mesh anilox roller, with a coating thickness of 2 μm. It is then dried at 100°C for 30 seconds to form the release layer 2.

[0064] The reactive dye receiving layer 3 consists of: 18 parts vinyl chloride-vinyl acetate copolymer, 7 parts MP-25 resin, HDI trimer, 0.8 parts zirconium oxychloride, 0.7 parts UV-384-2, 0.5 parts UV-1130, 1.5 parts 9122P, and 0.4 parts BYK323. The solvent used to prepare the coating solution is a mixture of 2-butanone and toluene in a 1:1 mass ratio, totaling 68.1 parts by mass. After ultrasonically dispersing the above components for 20 minutes and stirring for 60 minutes, the coating is applied using an 80-mesh gravure roller to a thickness of 6 μm. The coating is then dried at 120°C for 35 seconds to obtain the reactive dye receiving layer 3.

[0065] After curing for 24 hours at 25℃ and 50% humidity, a high weather-resistant thermal sublimation retransfer film for outdoor use is obtained.

[0066] Example 2 The outdoor high weather-resistant heat sublimation retransfer film of this embodiment contains a waterproof and moisture-proof protective layer 4, and its application environment is long-term outdoor scene.

[0067] The composition and preparation method of each layer in this embodiment are completely consistent with those in Example 1. The waterproof and moisture-proof protective layer 4 consists of 4 parts fluorocarbon resin, 0.8 parts hydrophobic nano silica, and the solvent used to prepare the coating solution is a mixture of ethyl acetate and butanol with a mass ratio of 3:1, comprising 95.2 parts by mass.

[0068] A 150-mesh anilox roller is used to apply a 1μm coating to the surface of the release layer 2. The coating is then dried at 100℃ for 20 seconds to obtain a waterproof and moisture-proof protective layer 4.

[0069] Comparative Example 1 This comparative example uses a traditional retransfer film, where the dye receiving layer contains no reactive substances and there is no protective layer.

[0070] The components of each layer are as follows: Release layer: 10 parts vinyl chloride-vinyl acetate resin (CP450), 90 parts solvent, coating thickness 2μm; Dye receiving layer: 25 parts vinyl chloride-vinyl acetate copolymer, 1.5 parts 9122P, 0.4 parts BYK323, 73.1 parts solvent, coating thickness 6μm; The preparation methods and parameters of the substrate layer 1 and each layer are the same as in Example 1.

[0071] Comparative Example 2 Compared to Comparative Example 1, this comparative example only added a light stabilizer to the dye receiving layer, without any reactive substances. Specifically, 0.8 parts of UV-1130 and 0.7 parts of UV-384-2 were added to the dye receiving layer of Comparative Example 1, with the rest being the same as Comparative Example 1.

[0072] Performance tests were conducted on the above embodiments and comparative examples, and the test plan is as follows: Test substrates: silk cloth, inkjet cloth (front-lit type), and Xuan paper (for outdoor art signage).

[0073] Testing equipment: Xenon lamp aging chamber (simulating outdoor rain, temperature 60℃, humidity 80%, UV band 270-405nm), fluorescence aging chamber, colorimeter (ΔE test), OD value tester, 3M SCOTCH tape (adhesion test), waterproof rating tester.

[0074] Test items and standards: (1) Weather resistance: Xenon lamp aging for 1000h (simulating 2 years outdoors), test ΔE (≤15) and OD retention rate (≥70%); fluorescence aging for 330h, test ΔE (≤10). (2) Adhesion: Tear the tape vertically at 90°, evaluation criteria A (no peeling), B (slight marks), C (peeling).

[0075] (3) Waterproofing: IPX5 rating test (no penetration when water jets).

[0076] (4) Transferability: 256 color gradation map transfer, evaluation criteria A (complete transfer), B (partial transfer), C (cannot be transferred).

[0077] The test results for each embodiment and comparative example are shown in Table 1: Table 1 Test results for each embodiment and comparative example The test results above show that the addition of reactive substances and weather-resistant additives to the reactive dye receiving layer 3 of the retransfer films in Examples 1 and 2 gives them a dual effect of chemical stability and physical protection, which significantly improves their weather resistance. Specifically, after 1000h xenon lamp aging, ΔE≤10 and OD retention rate≥85%, it is evident that they can meet the outdoor use requirements for 2 years, far exceeding the traditional retransfer film of Comparative Example 1 (ΔE>45).

[0078] The waterproof ratings of Examples 1 and 2 are excellent. In particular, Example 2, which adds a waterproof and moisture-proof protective layer 4, achieves a waterproof rating of IPX5 or higher, which can effectively solve the problem of dye loss caused by rain and fill the gap in the waterproof rating of traditional retransfer films.

[0079] Through transferability testing, the re-transfer films of Examples 1 and 2 are suitable for commonly used outdoor substrates such as silk cloth, inkjet cloth, and Xuan paper, with adhesion reaching Grade A and no coating peeling.

[0080] The fluorescence aging test shows that the reactive substances in the retransfer films of Examples 1 and 2 are compatible with the thermal sublimation printing process and do not affect the color reproduction (ΔE < 5). Moreover, the preparation process is compatible with the traditional retransfer film and no new equipment is required.

[0081] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An outdoor high-weather-resistant thermal sublimation retransfer film, comprising a substrate layer (1) and a release layer (2) located on the substrate layer (1), characterized in that, It also includes a reactive dye receiving layer (3) located on the release layer (2); The reactive dye receiving layer (3) comprises a receiving layer main resin, a reactive substance ultraviolet absorber, and a light stabilizer. The main resin of the receiving layer includes vinyl chloride-vinyl acetate copolymer and chloroether resin, and the reactive substances include isocyanate crosslinking agents and zirconium ion complexing agents.

2. The outdoor high-weather-resistant thermal sublimation retransfer film according to claim 1, characterized in that, The mass of the reactive substance is 5%-8% of the main resin of the receiving layer.

3. The outdoor high-weather-resistant thermal sublimation retransfer film according to claim 1, characterized in that, The reactive dye receiving layer (3) also includes a receiving layer auxiliary resin, which includes an adhesion promoting resin and an anti-sticking resin.

4. The outdoor high-weather-resistant thermal sublimation retransfer film according to claim 3, characterized in that, The adhesion-promoting resin is chlorinated polypropylene resin and / or polyester resin, and the anti-sticking resin is silicone resin.

5. The outdoor high-weather-resistant thermal sublimation retransfer film according to claim 4, characterized in that, In the reactive dye receiving layer (3), the mass fractions of each component are as follows: 15-20 parts of vinyl chloride-vinyl acetate copolymer, 5-10 parts of chloroether resin, 1-3 parts of isocyanate crosslinking agent, 0.5-1 part of zirconium ion complexing agent, 1-2 parts of chlorinated polypropylene resin, 0.5-1 part of polyester resin, 0.3-0.5 parts of organosilicon resin, 0.5-1 part of ultraviolet absorber, and 0.3-0.8 parts of light stabilizer.

6. An outdoor high-weather-resistant thermal sublimation retransfer film according to any one of claims 1-5, characterized in that, The thickness of the reactive dye receiving layer (3) is 5-8 μm.

7. An outdoor high-weather-resistant thermal sublimation retransfer film according to any one of claims 1-5, characterized in that, A waterproof and moisture-proof protective layer (4) is provided between the reactive dye receiving layer (3) and the release layer (2). The composition and mass fraction of the waterproof and moisture-proof protective layer (4) are as follows: 3-5 parts of fluorocarbon resin and 0.5-1 parts of hydrophobic nano silica. The particle size of the hydrophobic nano silica is 15-25 nm.

8. The outdoor high-weather-resistant thermal sublimation retransfer film according to claim 7, characterized in that, The thickness of the waterproof and moisture-proof protective layer (4) is 0.8-1.2μm.

9. A method for preparing an outdoor high-weather-resistant thermal sublimation retransfer film as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Perform corona treatment on the surface of the substrate layer (1) and then prepare the release layer (2). S2. Prepare a reactive dye receiving layer coating solution containing the main resin of the receiving layer and the reactive substance; S3. The reactive dye receiving layer coating liquid is coated on the release layer (2) and dried at 110-120℃ for 35-45s to obtain the reactive dye receiving layer (3). S4. The film is aged for 20-30 hours at 20-30℃ and 45%-55% humidity to obtain the outdoor high weather resistance heat sublimation retransfer film.

10. The method for preparing an outdoor high-weather-resistant thermal sublimation retransfer film according to claim 9, characterized in that, In step S2, the reactive dye receiving layer coating solution is prepared by mixing each component with a solvent and then ultrasonically dispersing and stirring; the solvent is 2-butanone and toluene in a mass ratio of 1:1.

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