Yellow heat transfer printing resin thermal transfer ribbon for road light reflecting mark and preparation method of yellow heat transfer printing resin thermal transfer ribbon

Abstract

The invention relates to the technical field of road reflective marks, in particular to a yellow heat transfer printing resin thermal transfer ribbon for a road reflective mark and a preparation method of the yellow heat transfer printing resin thermal transfer ribbon. The color layer of the thermal transfer ribbon comprises a pigment and thermoplastic methyl methacrylate. The pigments comprise a yellow pigment and a red pigment, the yellow pigment is at least one of an azo nickel complex type yellow pigment, a benzimidazolone yellow pigment and a benzimidazolone azo yellow pigment, and the red pigment is a diketopyrrolopyrrole red pigment. According to the yellow heat transfer printing resin thermal transfer ribbon, the high-transmittance yellow pigment is matched with the high-transmittance red pigment, so that the key indexes such as chromaticity coordinates and retroreflection coefficients of the yellow coating transferred to the reflective film meet the national standard; the transfer printing ink has excellent transfer printing sensitivity, weather resistance and scratch resistance, also has good hardness, adhesive force, scratch resistance and wear resistance, and has good tolerance to alcohols, grease, weak acids, weak alkalis and the like.

Description

Technical Field

[0001] This invention relates to the field of road reflective marking technology, and more specifically, to a yellow thermal transfer resin ribbon for road reflective marking and its preparation method. Background Technology

[0002] In modern transportation systems, road reflective markings, such as traffic signs and road markings, play a crucial role in ensuring driving safety at night or in low-light conditions. Yellow markings, in particular, are typically used for warnings and construction zones, requiring excellent visual visibility and long-term weather resistance. The national standard GB / T18833-2012, "Road Traffic Reflective Markings," sets strict requirements for the chromaticity coordinates (chromaticity performance) and retroreflectance coefficient (photometric performance) of Class V yellow reflective film used for these markings.

[0003] Traditional yellow ribbons are typically prepared using common yellow pigments (such as azo yellow pigments or chrome yellow pigments). These pigments often have low color purity, resulting in colors that are either too greenish or too dark, causing the chromaticity coordinates of the yellow coating to fall outside the range specified by national standards. Furthermore, many yellow pigments have poor light transmittance, leading to excessive absorption or scattering of light as it passes through the coating, resulting in a low retroreflection coefficient that does not meet national standards.

[0004] Specifically, the commonly available red hue yellows such as 139 and 83, and green hue yellows such as 110, all have certain limitations in practical applications. 139 yellow meets national standards for chromaticity and exhibits stable color performance, but its photometric performance fails to meet the standards, exhibiting insufficient brightness and poor gloss. While 83 yellow meets national standards for photometric performance and has good optical performance, its weather resistance is poor, and its performance is prone to degradation after long-term exposure to outdoor and ultraviolet light. 110 yellow meets national standards for both chromaticity and photometric performance, with vibrant color and good optical performance, but its weather resistance is poor, failing to meet national standards and limiting its use in applications requiring long-term weather resistance.

[0005] On the other hand, existing ordinary yellow thermal transfer ribbons mostly use traditional organic pigments (such as azo yellow) or inorganic pigments (such as chrome yellow). These yellow pigments have limitations in terms of color purity, light transmittance, and weather resistance, resulting in the yellow chromaticity coordinates of patterns or text transferred onto reflective film often not falling completely within the chromaticity coordinate range specified by national standards, especially with insufficient red hue causing chromaticity coordinate shifts. Furthermore, these pigments have poor light transmittance, severely affecting reflectivity, and fade or decrease in reflectivity after a period of outdoor use, failing to meet national standards in the long term. High-transmittance DPP red pigment is a high-performance organic pigment with high light transmittance, a vibrant red hue, and excellent weather resistance; however, its combination with high-transmittance yellow pigment in thermal transfer ribbons, and the optimized ratio to balance color and photometric performance, has not yet been reported. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a yellow thermal transfer resin ribbon for road reflective markings and a method for its preparation.

[0007] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: This invention provides a yellow heat transfer resin ribbon for road reflective markings, comprising a color layer, wherein the color layer comprises pigments and thermoplastic methyl methacrylate. The pigments include yellow pigments and red pigments. The yellow pigment is at least one of azo nickel complex type yellow pigment, benzimidazole ketone type yellow pigment, and benzimidazole ketone type azo yellow pigment. The red pigment is a diketopyrrolopyrrole type red pigment.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the mass ratio of the yellow pigment to the red pigment is 25-35:1.

[0010] Furthermore, the composition of the color layer and the mass percentage of each component are as follows: 30%-50% pigment, 40%-70% thermoplastic methyl methacrylate, and 0-2.5% functional additives.

[0011] Furthermore, the functional additives include plasticizers and / or anti-aging agents; the plasticizer is one of epoxidized soybean oil, phthalate, and adipic acid-based polyester, and the anti-aging agent is at least one of ultraviolet light absorber, photostable agent, and antioxidant.

[0012] Furthermore, it also includes a substrate, on both sides of which are respectively provided a back coating layer and a release layer, and the color layer is located on the release layer.

[0013] The present invention also provides a method for preparing a yellow thermal transfer resin ribbon for road reflective markings as described above, comprising the step of preparing a color layer coating liquid containing the pigment and the thermoplastic methyl methacrylate.

[0014] Furthermore, the color layer coating liquid is prepared by mixing the components of the color layer with an organic solvent and then grinding them.

[0015] Furthermore, after the grinding process, the particle size D in the color layer coating liquid... 50 Less than 0.1 μm, and D 90 Less than 1.0 μm.

[0016] Furthermore, the organic solvent is a mixture of butanone and toluene.

[0017] Further, the color layer coating liquid is applied to the release layer and cured to obtain the color layer.

[0018] The beneficial effects of this invention are as follows: (1) The yellow thermal transfer resin ribbon for road reflective markings of the present invention uses a suitable high-transparency yellow pigment and a high-transparency red pigment to make the yellow coating transferred to the reflective film meet the national standards in key indicators such as chromaticity coordinates and retroreflection coefficient. (2) The yellow heat transfer resin ribbon for road reflective markings of the present invention uses thermoplastic methyl methacrylate with high transparency, good optical properties and weather resistance, which can resist ultraviolet rays and oxidation and is not easy to yellow. (3) The yellow thermal transfer resin carbon ribbon for road reflective markings of the present invention has excellent transfer sensitivity, weather resistance and scratch resistance in its color layer. While ensuring the transparency and gloss of the coating, it also has good hardness, adhesion, scratch resistance and wear resistance. At the same time, it has good tolerance to alcohols, oils, weak acids and weak alkalis. (4) The preparation method of the yellow thermal transfer resin carbon ribbon for road reflective markings of the present invention is simple, efficient and safe in composition, and easy to promote. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the layer structure of the yellow thermal transfer resin ribbon for road reflective markings according to the present invention.

[0020] The attached diagram lists the components represented by each number as follows: 1. Substrate; 2. Release layer; 3. Color layer; 4. Back coating. Detailed Implementation

[0021] 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.

[0022] The present invention provides a yellow thermal transfer resin ribbon for road reflective markings, comprising a color layer 3, the composition of which includes pigments and thermoplastic methyl methacrylate; the pigments include yellow pigments and red pigments, wherein the yellow pigment is at least one of azo nickel complex type yellow pigment, benzimidazole ketone yellow pigment, and benzimidazole ketone azo yellow pigment, and the red pigment is a diketopyrrolopyrrole red pigment.

[0023] The yellow thermal transfer resin ribbon for road reflective markings of the present invention optimizes the composition of color layer 3 by selecting a suitable high-transparency yellow pigment and a high-transparency red pigment, and designs a suitable ratio of the two pigments so that the yellow coating transferred to the reflective film meets national standards in key indicators such as chromaticity coordinates and retroreflection coefficient, while also possessing excellent transfer sensitivity, weather resistance and scratch resistance.

[0024] Specifically, the various color-changing pigments and red pigments selected in this invention are all high-purity organic pigments with stable crystal structures. The yellow pigment has a greenish-yellow hue, providing a reference yellow, while the red pigment has a bluish-red hue, serving as a complementary color. After mixing, the red pigment can absorb excess green light from the yellow, thereby correcting the hue and making the yellow closer to the standard value. It is also less prone to phase separation or color migration, ensuring color uniformity and reproducibility. Their molecular structures all contain halogen atoms, effectively absorbing ultraviolet light and converting it into heat energy, preventing ultraviolet degradation of the resin and the pigment itself. After mixing, this protective effect is more comprehensive, covering a wider ultraviolet spectrum.

[0025] Both pigments exhibit high transmittance (≥80%) in the visible light range, especially at wavelengths of 500-600 nm, and the overall transmittance of the mixed coating remains at a high level. At this point, light loss during propagation within the coating is minimal, with more light penetrating the coating and being reflected back by the glass microspheres or microprisms of the reflective film, thus significantly improving the retroreflection coefficient and meeting national standards. Simultaneously, the pigments are well dispersed in the resin, reducing light scattering and making the coating more transparent, further enhancing the retroreflection coefficient. Experiments have confirmed that the chromaticity coordinates of the transferred coating after mixing the various yellow and red pigments of this invention fall within the range specified by national standards.

[0026] Furthermore, the thermoplastic methyl methacrylate used in this invention possesses high transparency, excellent optical properties, and weather resistance. It resists ultraviolet radiation and oxidation and is not prone to yellowing. When applied to pigment layers, it significantly improves the coating's hardness, adhesion, scratch resistance, and abrasion resistance while ensuring the coating's transparency and gloss. It also exhibits good resistance to alcohols, oils, weak acids, and weak alkalis.

[0027] Preferably, the mass ratio of yellow pigment to red pigment is 25-35:1; an improper ratio of yellow pigment to red pigment will cause the colorimetric performance to deviate from the national standard and lead to a decrease in photometric performance or weather resistance.

[0028] Preferably, the specific type of yellow pigment is pigment yellow 150, pigment yellow 151 or pigment yellow 154, and the specific type of red pigment is pigment red 254.

[0029] Pigment Yellow 150 belongs to the heterocyclic azo nickel complex pigment of the pyrimidine ring, Pigment Yellow 151 belongs to the benzimidazole ketone azo pigment, and Pigment Yellow 154 belongs to the benzimidazole ketone pigment.

[0030] Preferably, the color layer 3 also includes functional additives, which are plasticizers and / or anti-aging agents; the plasticizer is one of epoxidized soybean oil, phthalate, and adipic acid-based polyester. The plasticizer can provide excellent thermal stability, migration resistance and durability, and improve the durability of the reflective film after printing.

[0031] The anti-aging agent is at least one of ultraviolet light absorber, photostable agent, and antioxidant, which can further improve the weather resistance of the reflective film after printing.

[0032] Preferably, the mass percentages of each component in color layer 3 are: pigment 30%-50%, thermoplastic methyl methacrylate 40%-70%, and plasticizer 0.1%-2.5%; the total mass percentage of these components is 100%.

[0033] The thickness of color layer 3 is 0.8-2μm, preferably 1-1.5μm.

[0034] The yellow heat transfer resin ribbon of the present invention also includes a substrate 1, on both sides of the substrate 1 respectively having a back coating layer 4 and a release layer 2, and a color layer 3 located on the release layer 2.

[0035] There are no particular limitations on the material of the substrate 1, but it is preferred to be a material that can withstand the heat applied to the release layer 2 and the pigment layer 3 during heat transfer and whose mechanical properties are not affected during processing.

[0036] Preferably, the substrate 1 can be a film made of, for example, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), poly(1,4-cyclohexanediol) terephthalate, polyethylene (PE), polypropylene (PP) and polymethylpentene and other polyolefins, polyamides such as nylon 6 and nylon 6,6, polyvinyl alcohol (PVA), polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, vinyl butyral and polyvinylpyrrolidone (PVP) and other vinyl resins, polyacrylate, polymethacrylate and polymethyl methacrylate and other (meth)acrylic resins, polyimide and polyetherimide and other imide resins.

[0037] The thickness of substrate 1 is 4-10 μm, preferably 4-6 μm.

[0038] The purpose of the back coating 4 is to prevent the ribbon from becoming sticky or wrinkled due to the heat of the print head during thermal transfer.

[0039] Preferably, the back coating 4 may contain an adhesive resin, such as cellulose resin, vinyl resin, styrene resin, polyester resin, polyurethane resin, and acrylic resin.

[0040] Preferably, inorganic or organic microparticles may be added to the back coating 4 to provide good heat resistance and lubricity. Examples of inorganic microparticles include clay minerals such as talc and kaolin, hydroxides such as calcium carbonate and calcium sulfate, aluminum hydroxide and magnesium hydroxide, sulfates such as calcium sulfate, oxides such as silicon dioxide, graphite, nitrate, and boron nitride. Examples of organic microparticles include organic resin microparticles composed of acrylic resin, silicone resin, phenolic resin, acetal resin, polystyrene resin, and nylon resin.

[0041] Preferably, the back coating 4 may also contain additives such as polymeric permanent antistatic agents, wetting agents, defoamers, and crosslinking agents to improve the surface properties of the coating and make the coating more uniform.

[0042] The thickness of the back coating 4 is 0.1-0.7μm, preferably 0.2-0.5μm; the back coating 4 within this thickness range can maintain heat transfer from the thermal head to achieve sufficient printing density, while preventing defects such as stickiness or wrinkles.

[0043] Release layer 2 is composed of 100% thermoplastic acrylic resin. This resin has good thermal stability and excellent and controllable release force. The ribbon can achieve good peeling and transfer properties after being heated by the thermal printhead. It also has good adhesion to a variety of substrates and good processing adaptability.

[0044] The release layer thickness is 0.1-0.4μm, preferably 0.1-0.3μm.

[0045] The present invention provides a method for preparing a yellow thermal transfer resin ribbon for road reflective markings, comprising the step of preparing a color layer coating liquid containing pigment and thermoplastic methyl methacrylate.

[0046] Preferably, the color layer coating liquid is prepared by mixing the pigment, the thermoplastic methyl methacrylate and an organic solvent and then grinding them.

[0047] Preferably, after grinding, the particle size D in the color layer coating liquid is... 50 Less than 0.1 μm, and D 90 The particle size range of less than 1.0 μm allows the pigment to be evenly distributed in the coating, avoiding color differences caused by pigment agglomeration or uneven distribution.

[0048] Preferably, the organic solvent is a mixture of butanone and toluene in a mass ratio of 1:1.

[0049] Preferably, in the color layer coating liquid, the mass ratio of the mixed solvent to other components is 80:20.

[0050] The preparation method of the present invention comprises the following specific steps: Corona discharge is applied to both sides of substrate 1, and then a back coating liquid is applied to one side. After curing, a back coating 4 is obtained. A release layer liquid is applied to the other side, and after curing, a release layer 2 is obtained. A color layer liquid is applied to release layer 2, and after curing, a color layer 3 is obtained.

[0051] Preferably, the curing method is drying, with a temperature of 60-100℃ and a time of 5 seconds.

[0052] Preferably, the coating method is gravure coating, using a gravure coating machine and a 250-line ceramic anilox roller to coat the color layer onto the substrate 1.

[0053] The present invention will be illustrated by specific embodiments below.

[0054] Example 1 In this embodiment, the yellow heat transfer resin ribbon uses a PET substrate as substrate 1, and the specific formulations of the coating solutions for each layer are as follows: Back coating solution: 9 parts cellulose resin, 0.5 parts polyurethane, 0.3 parts silica, 0.2 parts aldehyde-ketone resin, 60 parts methyl ethyl ketone, and 30 parts toluene.

[0055] Release layer coating liquid: 10 parts thermoplastic acrylic resin, 45 parts methyl ethyl ketone, and 45 parts toluene.

[0056] Color coating solution: 10 parts thermoplastic methyl methacrylate, 9.615 parts pigment yellow 150, 0.385 parts pigment red 254, 0.5 parts epoxidized soybean oil, 40 parts toluene, and 40 parts methyl ethyl ketone. After mixing the above components evenly, grind them to achieve the desired particle size D in the color coating solution. 50 Less than 0.1 μm, and D 90 Less than 1.0 μm.

[0057] The method for preparing the yellow thermal transfer resin ribbon in this embodiment is as follows: A corona discharge is applied to both sides of a PET substrate. A back coating liquid is then applied to one side and cured to obtain a back coating layer 4. A release layer liquid is applied to the other side and cured to obtain a release layer 2. A color layer liquid is then applied to the release layer 2 and cured to obtain a color layer 3.

[0058] Example 2 In this embodiment, the yellow thermal transfer resin ribbon contains 9.678 parts by weight of pigment yellow 150 and 0.322 parts by weight of pigment red 254 in the color layer coating liquid, and all other components are the same as in Example 1.

[0059] Example 3 In this embodiment, the yellow thermal transfer resin ribbon contains 9.722 parts by weight of pigment yellow 150 and 0.278 parts by weight of pigment red 254 in the color layer coating liquid, and all other components are the same as in Example 1.

[0060] Example 4 In this embodiment, the yellow thermal transfer resin ribbon contains 9.722 parts by weight of pigment yellow 151 and 0.278 parts by weight of pigment red 254 in the color layer coating liquid, and all other components are the same as in Example 1.

[0061] Comparative Example 1 In this comparative example, the yellow thermal transfer resin ribbon contains 9.524 parts by mass of Pigment Yellow 150 and 0.476 parts by mass of Pigment Red 254 in the color layer coating liquid, and all other components are consistent with those in Example 1.

[0062] Comparative Example 2 In this comparative example, the yellow thermal transfer resin ribbon has a color layer coating solution containing 9.756 parts by mass of Pigment Yellow 150 and 0.244 parts by mass of Pigment Red 254, and all other components are consistent with those in Example 1.

[0063] Comparative Example 3 In this comparative example, the yellow thermal transfer resin ribbon has a pigment yellow 110 content of 9.722 parts by mass and pigment red 254 content of 0.278 parts by mass in the color layer coating liquid, and all other contents are consistent with those in Example 1.

[0064] The types and formulations of pigments in the above embodiments and comparative examples are shown in Table 1: Table 1 Based on the national standard GB / T 18833-2012 and practical application requirements, the colorimetric properties, photometric properties, and weather resistance of the reflective films printed with yellow resin-based carbon ribbons in the above embodiments and comparative examples were tested.

[0065] The specific provisions of national standard GB / T 18833-2012 are as follows: The chromaticity coordinates (x, y) of the yellow reflective film should be within the specified ranges of the four chromaticity coordinates: (0.545, 0.454), (0.494, 0.426), (0.444, 0.476), and (0.481, 0.518). With an observation angle of 0.2°, the RA of the yellow reflective film should be ≥435 cd / lx / m² at an incident angle of -4°, ≥261 cd / lx / m² at an incident angle of 30°, and ≥163 cd / lx / m² at an incident angle of 45°.

[0066] The specific tests are as follows: (1) Colorimetric performance test: The CIE standard illuminant D65 light source specified in GB / T3978 was used. The geometric conditions for measurement were 45°a∶0°. The chromaticity coordinates (x,y) of the yellow reflective film were measured by a colorimeter according to the method specified in GB / T3979, and evaluated according to the following evaluation criteria: OK: The chromaticity coordinates are within the national standard range; NG: The chromaticity coordinates are not within the national standard range.

[0067] Specifically, this test used a thermal transfer traffic sign printer (manufactured by Hunan Dingyi Intelligent Manufacturing Co., Ltd., model DTP-1300) and a yellow ribbon to print color blocks on 3M Class V reflective film.

[0068] Test equipment: Use a colorimeter (such as X-Rite i1PRO 3) to measure the chromaticity coordinates (x, y) of the coating transferred onto the reflective film surface.

[0069] Test conditions: Standard light source D65, standard viewing angle 2°.

[0070] Test data: See Table 2.

[0071] Test results: See Table 3.

[0072] (2) Photometric performance test: The retroreflection coefficient of the reflective film shall be measured by a retroreflection coefficient measuring instrument according to the method specified in JT / T690, and evaluated according to the following evaluation criteria: OK: Retroreflection coefficient RA is not lower than the national standard; NG: Retroreflection coefficient RA is lower than the national standard.

[0073] Specifically, this testing equipment uses a retroreflectance coefficient measuring instrument (such as Retroreflectance Cometer Road Vista-932) to measure the retroreflectance coefficient (RA) of the yellow reflective film, with the unit being cd / lx / m².

[0074] Test conditions: observation angle 0.2°, incident angles -4°, 30°, and 45°. Sample preparation and colorimetric performance testing.

[0075] Test data: See Table 2.

[0076] Test results: See Table 3 (3) Weather resistance test: The test was conducted according to the operating procedure of GB / T16422.2-2014 Plastics Laboratory Light Source Exposure Test Method Part 2: Xenon Arc Lamp, with a test cycle of 1800 hours. The Lab values ​​of the yellow reflective film before and after the accelerated aging test were measured using a colorimeter, and the results were evaluated based on the following criteria: OK: Color difference ∆E≤5; NG: Color difference ∆E > 5; The formula for calculating color difference is as follows: Color difference ∆E = ((L value before test - L value after test)^2 + (a value before test - a value after test)^2 + (b value before test - b value after test))^0.5.

[0077] The test results are shown in Table 3.

[0078] Table 2 Test data for colorimetric and photometric performance tests Table 3 Results of each test The results above show that the chromaticity coordinates of all embodiments fall within the color gamut of yellow reflective film specified in the national standard GB / T18833-2012. Among them, the coordinates of Embodiment 1 (0.522, 0.457) are close to the upper limit of the standard, the coordinates of Embodiment 3 (0.493, 0.489) are closer to the central area, and the coordinates of Embodiment 4 (0.490, 0.486) are similar to those of Embodiment 3.

[0079] Photometric performance test results show that the retroreflection coefficients of Examples 1-4 at an incident angle of -4° are 463, 481, 492 and 487 cd / lx / m, respectively. 2 All of them are significantly higher than the national standard requirement of 435 cd / lx / m 2Furthermore, the value increases with the increase of the proportion of pigment yellow, reaching its highest value in Example 3, and also meets the standard requirements at incident angles of 30° and 45°.

[0080] Weather resistance test results show that the color difference ΔE of each embodiment is ≤5 after 1800 hours of xenon lamp aging.

[0081] When using a 20:1 pigment ratio in Comparative Example 1, the chromaticity coordinates (0.534, 0.438) exceeded the standard range, resulting in NG (Not Acceptable) chromaticity performance, and the retroreflectance coefficient was 389 cd / lx / m. 2 Failure to meet standards resulted in substandard photometric performance. Although weather resistance was acceptable, overall performance was compromised. In Comparative Example 2, with a 40:1 mixing ratio, the chromatic coordinates were (0.478, 0.495) and the photometric index was 440 cd / lx / m. 2 Although barely passable, the weather resistance test showed ΔE>5, resulting in an NG rating. This indicates that an excessively low proportion of red pigment severely affects resistance to UV aging. While the coordinates (0.498, 0.456) of Comparative Example 3, after replacing the red pigment with Yellow 110, met the chromaticity requirements, the retroreflectance coefficient was only 345 cd / lx / m. 2 The results were far below the standard, resulting in poor photometric performance and poor weather resistance. This proves that although Pigment Yellow 110 performs reasonably well in the pure yellow phase, its light transmittance and structural stability are significantly deteriorated when it is compounded with Red 254.

[0082] As can be seen, the yellow carbon ribbon of the present invention, by optimizing the composition of the color layer 3, can achieve both long-term weather resistance and high reflectivity.

[0083] 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. A yellow thermal transfer resin ribbon for road reflective markings, comprising a color layer (3), characterized in that, The color layer (3) comprises pigments and thermoplastic methyl methacrylate; The pigments include yellow pigments and red pigments. The yellow pigment is at least one of azo nickel complex type yellow pigment, benzimidazole ketone type yellow pigment, and benzimidazole ketone type azo yellow pigment. The red pigment is a diketopyrrolopyrrole type red pigment.

2. The yellow thermal transfer resin ribbon for road reflective markings according to claim 1, characterized in that, The mass ratio of the yellow pigment to the red pigment is 25-35:

1.

3. The yellow heat transfer resin ribbon for road reflective markings according to claim 1, characterized in that, The composition and mass percentage of the color layer (3) are as follows: 30%-50% pigment, 40%-70% thermoplastic methyl methacrylate, and 0-2.5% functional additives.

4. The yellow heat transfer resin ribbon for road reflective markings according to claim 3, characterized in that, The functional additives include plasticizers and / or anti-aging agents; the plasticizer is one of epoxidized soybean oil, phthalate, and adipic acid-based polyester, and the anti-aging agent is at least one of ultraviolet light absorber, photostable agent, and antioxidant.

5. A yellow heat transfer resin ribbon for road reflective markings according to any one of claims 1-4, characterized in that, It also includes a substrate (1), on which a back coating layer (4) and a release layer (2) are respectively provided on both sides, and the color layer (3) is located on the release layer (2).

6. A method for preparing a yellow thermal transfer resin ribbon for road reflective markings as described in any one of claims 1-5, characterized in that, The process includes the step of preparing a color coating solution containing the pigment and the thermoplastic methyl methacrylate.

7. A method for preparing a yellow thermal transfer resin ribbon for road reflective markings according to claim 6, characterized in that, The color layer coating liquid is prepared by mixing each component of the color layer (3) with an organic solvent and then grinding it.

8. A method for preparing a yellow thermal transfer resin ribbon for road reflective markings according to claim 7, characterized in that, After the grinding process, the particle size D in the color layer coating liquid 50 Less than 0.1 μm, and D 90 Less than 1.0 μm.

9. A method for preparing a yellow thermal transfer resin ribbon for road reflective markings according to claim 7, characterized in that, The organic solvent is a mixture of butanone and toluene.

10. A method for preparing a yellow thermal transfer resin ribbon for road reflective markings according to claim 6, characterized in that, The color layer coating liquid is applied to the release layer (2), and the color layer (3) is obtained after curing.

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