Preparation method of photocuring flexographic printing ink for outdoor reflective film

Abstract

The invention discloses a preparation method of photocuring flexographic printing ink for an outdoor reflective film, which comprises the following steps of: 1, preparing color paste, namely compounding the high-concentration color paste according to printing ink with different color concentration requirements, and meeting the wider application requirement of the printing ink by the high-color-concentration color paste; in the second step, binder gloss oil is prepared in advance, the binder gloss oil is prepared in advance when the color paste is ground and produced, and the binder gloss oil can be compounded immediately after the color paste is ground, so that time is saved. In the third step, compounding is carried out according to the color concentration, tinting strength and viscosity of different colors of the four-color ink in proportion to obtain a corresponding product. According to the three-step preparation method, the problem that the storage time is short due to the fact that the UV / LED light-cured ink is sensitive to the environment can be well solved, the stability of the product quality can be well controlled in the first step and the second step, the third step is used for preparing the finished product for delivery after an order is received, and the production efficiency is greatly improved. Therefore, the storage cost of finished products of enterprises can be well controlled.

Description

Technical Field

[0001] The invention relates to the technical field of ink production, and in particular to a method for preparing a light-curing flexographic printing ink for outdoor reflective film. Background Art

[0002] When printing and processing various patterns and fonts such as various traffic road signs and car body stickers, outdoor reflective films at home and abroad are mostly colored by gravure or silk screen printing. The colors are bright, the patterns are diverse, and the fonts are thick and transparent. They are highly recognizable both during the day and at night. The color processing of reflective films produced and processed domestically is mostly pure color. When the pattern is required for color overlay, it is mostly printed by gravure printing in the front process of the reflective film. After printing, the reflective layer with microbead structure is coated or the reflective layer with molded microprism structure is laminated. This process is difficult to modify when wrong characters or wrong pictures appear. In addition, the production cycle of the plate roller required for multi-color overlay is long and the price is high. A certain amount of production orders is required to reduce the cost. The process of using silk screen external printing for graphic printing has low processing and printing efficiency, unclear pattern dots, and it is difficult to achieve processing and printing of gradient colors or overlay dots.

[0003] To solve the above problems, flexographic printing is a relatively good solution at present. However, flexographic printing is currently mainly used for printing paper and labels. Flexographic inks have not been widely used in the printing and production of outdoor reflective films. Flexographic inks are mostly water-based inks, and the weather resistance of such inks in outdoor environments has not yet reached the performance requirements of outdoor reflective films. In particular, the climates of different countries and regions vary greatly, making it difficult to meet the international requirement of more than 10 years of use.

[0004] In view of the difficulties of the above-mentioned inks, the present invention provides a UV / LED high-transmittance and high-weather-resistant ultraviolet light-curing flexographic printing ink for outdoor reflective film materials. Summary of the invention

[0005] The present invention aims at the defects of the prior art such as high production cost, not requiring small batch production, serious pollution, etc., and provides a novel preparation method of light-curing flexographic printing ink for outdoor reflective film.

[0006] In order to solve the above technical problems, the present invention is implemented by the following technical solutions:

[0007] A method for preparing a light-curing flexographic printing ink for outdoor reflective film comprises the following steps:

[0008] S1. Take 70 to 85 parts of active monomer, 10 to 15 parts of ternary copolymer resin, 1 to 1.5 parts of dispersant, 0.1 to 0.2 parts of inhibitor, 10 to 15 parts of highly light-resistant transparent organic pigment, stir at a speed of 7 to 10 m / s for 2 hours, then transfer to a grinder for grinding, the fineness reaches less than 5 microns, and obtain a color paste for standby use;

[0009] S2. Take 20 to 30 parts of polyurethane-modified acrylic polymer, 20 to 30 parts of polyester-modified acrylic polymer, 5 to 10 parts of active amine polymer, 25 to 30 parts of active monomer, 3 to 5 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2 to 4 parts of 1-hydroxycyclohexyl phenyl ketone, 2 to 4 parts of 1-phenyl-1,2-propanedione, 0.2 to 0.5 parts of polyethylene wax, 0.5 to 1 parts of defoaming agent, 0.5 to 1 parts of leveling agent, disperse at a high speed of 7 to 10 m / s for 30 minutes to obtain ink vehicle varnish, cool and shield from light for standby use;

[0010] S3. Take 30-40 parts of the color paste obtained in step S1 and 60-70 parts of the ink vehicle varnish obtained in step S2, stir at a low linear speed of 3-5 m / s for 10 minutes, let stand for 2 hours to defoam, and obtain the finished product.

[0011] Among them, the present application uses three steps to prepare the ink. The first step is the preparation of the color paste: the high-concentration color paste can be compounded according to the ink with different color concentration requirements, not only for the single-color compounding of the four-color ink, but also for the compounding of the special color ink with higher requirements. The color paste with high color concentration gives the ink a wider application requirement. In this step, a ternary copolymer resin, a binder with excellent performance in pigment wetting, is used. The resin itself has very good compatibility and has good adhesion to various substrates. It has a wide range of adaptability and is a good pigment carrier, and the storage time can be very long. The second step is to prepare the binder varnish in advance, which can be prepared in advance when the color paste is ground and produced. After the color paste is ground, it can be compounded immediately, which saves time for the production of ink and increases the production speed of the finished ink. The compounding in the third step is to compound the corresponding products according to the color concentration, tinting power and viscosity of different colors of the four-color ink in proportion.

[0012] This application uses a combination of polyurethane modified acrylic resin polymer and polyester modified acrylate resin polymer, which is complementary to the entire ink system. It brings some of the properties of polyurethane resin and polyester resin into the ink. Because the main polymer acrylic resin is modified, it has excellent compatibility. It can be cured by photocuring reaction agent, has good curing properties, acid and alkali resistance, solvent resistance, high hardness after curing, excellent strength, low shrinkage, heat resistance and high TG, thereby improving the protection and scratch resistance of the ink. However, it has a certain flexibility of polyester resin. It also reflects the high toughness, wear resistance, water resistance and other properties of polyurethane resin.

[0013] In addition, since polyethylene wax powder is added to the ink, the wax powder will float on the surface of the coating after the ink is applied to form a coating, which can effectively prevent the inhibition of oxygen in the air on the surface of the ink, promote the photocuring of the ink, and thus achieve high-speed photocuring.

[0014] In order to improve the curing form and speed of the product, the present application can cure not only in a mercury lamp light source but also in an LED light source. Therefore, three photoinitiators, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 1-hydroxycyclohexyl phenyl ketone and 1-phenyl-1,2-propanedione, are used. The three initiators can promote each other in a wider range of light wavelengths of 200nm to 400nm in a certain proportion, so as to achieve rapid and complete curing. At the same time, an active amino resin polymer is added to the ink system to promote the excitation speed of the initiator and play a role in inhibiting polyoxidation.

[0015] Preferably, in the method for preparing the above-mentioned light-curing flexographic printing ink for outdoor reflective film, the ternary copolymer resin is a vinyl chloride-vinyl acetate-maleic anhydride copolymer or a vinyl chloride-vinyl acetate-vinyl alcohol copolymer.

[0016] Preferably, in the method for preparing a light-curing flexographic printing ink for outdoor reflective film described above, the highly light-resistant transparent organic pigment in step S1 is one of PY180 yellow, PR122 red, PB15:4 phthalocyanine blue, and 7# pigment carbon black.

[0017] Preferably, in the method for preparing a light-curable flexographic printing ink for outdoor reflective film described above, the polyurethane-modified acrylic polymer in step S2 has a functionality of 2 to 3, a TG value of 22 to 25° C., a tensile strength of 1000 to 1200, and an elongation of 81%.

[0018] Preferably, in the method for preparing a light-curable flexographic printing ink for outdoor reflective film described above, the polyester-modified acrylic polymer in step S2 has a functionality of 2 to 3, a tensile strength of 1.1, and an elongation at break of 20.5%.

[0019] Preferably, in the method for preparing a light-curable flexographic printing ink for outdoor reflective film described above, the active amine polymer in step S2 is a tertiary amine polymer containing a reactive group, with a molecular weight of 250 to 270 g / mol, a TG value of 10 to 15° C., and an amine value of 120 to 150.

[0020] Preferably, in the method for preparing a light-curing flexographic printing ink for outdoor reflective film described above, the inhibitor in step S1 is one of N-nitroso-N-phenylhydroxylamine aluminum, hydroquinone, p-tetraoxyphenol, and N-nitrophenylhydroxylamine aluminum salt.

[0021] Preferably, in the method for preparing a light-curing flexographic printing ink for outdoor reflective film described above, the leveling agent in step S2 is polyether-modified polydimethylsiloxane, the solid content of the polyether-modified polydimethylsiloxane is 100%, the viscosity is 800-1200 (25°C, cs), and the surface tension is 22-25 (25°C, mN / m).

[0022] Preferably, in the method for preparing the above-mentioned photocurable flexographic printing ink for outdoor reflective film, the active monomers are one or two of 1,6-hexanediol diacrylate and acryloylmorpholine.

[0023] Preferably, in the method for preparing a light-curable flexographic printing ink for outdoor reflective film described above, the polyethylene wax in step S2 has a fineness of less than 5 um.

[0024] Compared with the prior art, this application has the following beneficial effects:

[0025] 1. The three-step preparation method adopted in this application can effectively solve the problem that UV / LED light-curing ink is sensitive to environmental influences and has a short storage time. The stability of product quality can be well controlled in the first and second steps. After receiving the order, the third step is used to prepare the finished product for shipment. In this way, the storage cost of the company's finished products can be well controlled and the rate of obsolete products can be reduced.

[0026] 2. The product prepared in this application brings a new printing method to the graphic display in the outdoor reflective film industry, with low production cost, high efficiency, no VOC emissions, and green environmental protection.

[0027] 3. Compared with traditional products, the product prepared in this application has better outdoor weather resistance, acid, alkali resistance, solvent resistance and other properties because the ink layer formed after light curing meets the application requirements of outdoor reflective film inks in outdoor areas. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with specific embodiments, but they are not intended to limit the present invention:

[0029] Example 1

[0030] A method for preparing a light-curing flexographic printing ink for outdoor reflective film comprises the following steps:

[0031] S1. Take 79 parts of active monomer, 10 parts of ternary copolymer resin, 1 part of dispersant, 0.1 parts of inhibitor, 10 parts of highly light-resistant transparent organic pigment, at a speed of 10 m / s, high-speed stirring for 2 hours, and then transferred to a grinder for grinding, the fineness reached 5 microns or less, to obtain a color paste for standby;

[0032] S2. Take 30 parts of polyurethane-modified acrylic polymer, 20 parts of polyester-modified acrylic polymer, 5 parts of active amine polymer, 30 parts of active monomer, 5 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2 parts of 1-hydroxycyclohexyl phenyl ketone, 4 parts of 1-phenyl-1,2-propanedione, 0.5 parts of polyethylene wax, 0.5 parts of defoamer, 0.5 parts of leveling agent, dispersed at a high speed of 10 m / s for 30 minutes, and obtained ink binder varnish, cooled and shielded from light for standby;

[0033] S3. Take 30-40 parts of the color paste obtained in step S1 and 70 parts of the ink vehicle varnish obtained in step S2, stir at a low linear speed of 5 m / s for 10 minutes, let stand for 2 hours to defoam, and obtain the finished product.

[0034] Preferably, the terpolymer resin is a vinyl chloride-vinyl acetate-maleic anhydride copolymer or a vinyl chloride-vinyl acetate-vinyl alcohol copolymer.

[0035] Preferably, the highly light-resistant transparent organic pigment in step S1 is PY180 yellow.

[0036] Preferably, the polyurethane modified acrylic polymer in step S2 has a functionality of 2 to 3, a TG value of 22 to 25° C., a tensile strength of 1000 to 1200, and an elongation of 81%.

[0037] Preferably, the polyester-modified acrylic polymer in step S2 has a functionality of 2 to 3, a tensile strength of 1.1, and an elongation at break of 20.5%.

[0038] Preferably, the active amine polymer in step S2 is a tertiary amine polymer containing reactive groups, with a molecular weight of 250-270 g / mol, a TG value of 10-15° C., and an amine value of 120-150.

[0039] Preferably, the inhibitor in step S1 is one of N-nitroso-N-phenylhydroxylamine aluminum, hydroquinone, p-tetraoxyphenol, and N-nitrophenylhydroxylamine aluminum salt.

[0040] Preferably, the leveling agent in step S2 is polyether-modified polydimethylsiloxane, the solid content of the polyether-modified polydimethylsiloxane is 100%, the viscosity is 800-120025°C, cs, and the surface tension is 22-25 (25°C, mN / m).

[0041] Preferably, the active monomers are 1,6-hexanediol diacrylate and acryloylmorpholine.

[0042] Preferably, the polyethylene wax in step S2 has a fineness of less than 5 um.

[0043] Example 2

[0044] A method for preparing a light-curing flexographic printing ink for outdoor reflective film comprises the following steps:

[0045] S1. Take 74 parts of active monomer, 10 parts of ternary copolymer resin, 1.5 parts of dispersant, 0.1 parts of inhibitor, 15 parts of highly light-resistant transparent organic pigment, stir at a speed of 10 m / s for 2 hours, then transfer to a grinder for grinding to a fineness of less than 5 microns to obtain a color paste for standby use;

[0046] S2. Take 25 parts of polyurethane-modified acrylic polymer, 25 parts of polyester-modified acrylic polymer, 8 parts of active amine polymer, 25 parts of active monomer, 3 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 4 parts of 1-hydroxycyclohexyl phenyl ketone, 2 parts of 1-phenyl-1,2-propanedione, 0.5 parts of polyethylene wax, 0.5 parts of defoamer, 0.5 parts of leveling agent, dispersed at a high speed of 10 m / s for 30 minutes, and obtained ink binder varnish, cooled and shielded from light for standby;

[0047] S3. Take 40 parts of the color paste obtained in step S1 and 60 parts of the ink vehicle varnish obtained in step S2, stir them at a low linear speed of 5 m / s for 10 minutes, let them stand for 2 hours to defoam, and obtain the finished product.

[0048] Preferably, the terpolymer resin is a vinyl chloride-vinyl acetate-maleic anhydride copolymer or a vinyl chloride-vinyl acetate-vinyl alcohol copolymer.

[0049] Preferably, the highly light-resistant transparent organic pigment in step S1 is PR122 red.

[0050] Preferably, the polyurethane modified acrylic polymer in step S2 has a functionality of 2 to 3, a TG value of 22 to 25° C., a tensile strength of 1000 to 1200, and an elongation of 81%.

[0051] Preferably, the polyester-modified acrylic polymer in step S2 has a functionality of 2 to 3, a tensile strength of 1.1, and an elongation at break of 20.5%.

[0052] Preferably, the active amine polymer in step S2 is a tertiary amine polymer containing reactive groups, with a molecular weight of 250-270 g / mol, a TG value of 10-15° C., and an amine value of 120-150.

[0053] Preferably, the inhibitor in step S1 is one of N-nitroso-N-phenylhydroxylamine aluminum, hydroquinone, p-tetraoxyphenol, and N-nitrophenylhydroxylamine aluminum salt.

[0054] Preferably, the leveling agent in step S2 is polyether-modified polydimethylsiloxane, the solid content of the polyether-modified polydimethylsiloxane is 100%, the viscosity is 800-120025°C, cs, and the surface tension is 22-25 (25°C, mN / m).

[0055] Preferably, the active monomers are 1,6-hexanediol diacrylate and acryloylmorpholine.

[0056] Preferably, the polyethylene wax in step S2 has a fineness of less than 5 um.

[0057] Example 3

[0058] A method for preparing a light-curing flexographic printing ink for outdoor reflective film comprises the following steps:

[0059] S1. Take 75 parts of active monomer, 12 parts of ternary copolymer resin, 1 part of dispersant, 0.1 parts of inhibitor, 12 parts of highly light-resistant transparent organic pigment, at a speed of 10 m / s, high-speed stirring for 2 hours, and then transferred to a grinder for grinding, the fineness reached 5 microns or less, to obtain a color paste for standby;

[0060] S2. Take 30 parts of polyurethane-modified acrylic polymer, 20 parts of polyester-modified acrylic polymer, 5 parts of active amine polymer, 30 parts of active monomer, 5 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2 parts of 1-hydroxycyclohexyl phenyl ketone, 4 parts of 1-phenyl-1,2-propanedione, 0.5 parts of polyethylene wax, 0.5 to 0.5 parts of defoamer, 0.5 parts of leveling agent, disperse at a high speed of 10 m / s for 30 minutes to obtain ink binder varnish, cool and shield from light for standby;

[0061] S3. Take 35 parts of the color paste obtained in step S1 and 65 parts of the ink vehicle varnish obtained in step S2, stir them at a low linear speed of 5 m / s for 10 minutes, let them stand for 2 hours to defoam, and obtain the finished product.

[0062] Preferably, the terpolymer resin is a vinyl chloride-vinyl acetate-maleic anhydride copolymer or a vinyl chloride-vinyl acetate-vinyl alcohol copolymer.

[0063] Preferably, the highly light-resistant transparent organic pigment in step S1 is PB15:4 phthalocyanine blue.

[0064] Preferably, the polyurethane modified acrylic polymer in step S2 has a functionality of 2 to 3, a TG value of 22 to 25° C., a tensile strength of 1000 to 1200, and an elongation of 81%.

[0065] Preferably, the polyester-modified acrylic polymer in step S2 has a functionality of 2 to 3, a tensile strength of 1.1, and an elongation at break of 20.5%.

[0066] Preferably, the active amine polymer in step S2 is a tertiary amine polymer containing reactive groups, with a molecular weight of 250-270 g / mol, a TG value of 10-15° C., and an amine value of 120-150.

[0067] Preferably, the inhibitor in step S1 is one of N-nitroso-N-phenylhydroxylamine aluminum, hydroquinone, p-tetraoxyphenol, and N-nitrophenylhydroxylamine aluminum salt.

[0068] Preferably, the leveling agent in step S2 is polyether-modified polydimethylsiloxane, the solid content of the polyether-modified polydimethylsiloxane is 100%, the viscosity is 800-120025°C, cs, and the surface tension is 22-25 (25°C, mN / m).

[0069] Preferably, the active monomers are 1,6-hexanediol diacrylate and acryloylmorpholine.

[0070] Preferably, the polyethylene wax in step S2 has a fineness of less than 5 um.

[0071] Example 4

[0072] A method for preparing a light-curing flexographic printing ink for outdoor reflective film comprises the following steps:

[0073] S1. Take 79 parts of active monomer, 10 parts of ternary copolymer resin, 1 part of dispersant, 0.1 parts of inhibitor, 10 parts of highly light-resistant transparent organic pigment, at a speed of 10 m / s, high-speed stirring for 2 hours, and then transferred to a grinder for grinding, the fineness reached 5 microns or less, to obtain a color paste for standby;

[0074] S2. Take 30 parts of polyurethane-modified acrylic polymer, 20 parts of polyester-modified acrylic polymer, 10 parts of active amine polymer, 25 parts of active monomer, 5 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 4 parts of 1-hydroxycyclohexyl phenyl ketone, 4 parts of 1-phenyl-1,2-propanedione, 0.5 parts of polyethylene wax, 0.5 parts of defoamer, 0.5 parts of leveling agent, dispersed at a high speed of 10 m / s for 30 minutes, and obtained ink vehicle varnish, cooled and shielded from light for standby;

[0075] S3. Take 30 parts of the color paste obtained in step S1 and 70 parts of the ink vehicle varnish obtained in step S2, stir them at a low linear speed of 5 m / s for 10 minutes, let them stand for 2 hours to defoam, and obtain the finished product.

[0076] Preferably, the terpolymer resin is a vinyl chloride-vinyl acetate-maleic anhydride copolymer or a vinyl chloride-vinyl acetate-vinyl alcohol copolymer.

[0077] Preferably, the highly light-resistant transparent organic pigment in step S1 is 7# pigment carbon black.

[0078] Preferably, the polyurethane modified acrylic polymer in step S2 has a functionality of 2 to 3, a TG value of 22 to 25° C., a tensile strength of 1000 to 1200, and an elongation of 81%.

[0079] Preferably, the polyester-modified acrylic polymer in step S2 has a functionality of 2 to 3, a tensile strength of 1.1, and an elongation at break of 20.5%.

[0080] Preferably, the active amine polymer in step S2 is a tertiary amine polymer containing reactive groups, with a molecular weight of 250-270 g / mol, a TG value of 10-15° C., and an amine value of 120-150.

[0081] Preferably, the inhibitor in step S1 is one of N-nitroso-N-phenylhydroxylamine aluminum, hydroquinone, p-tetraoxyphenol, and N-nitrophenylhydroxylamine aluminum salt.

[0082] Preferably, the leveling agent in step S2 is polyether-modified polydimethylsiloxane, the solid content of the polyether-modified polydimethylsiloxane is 100%, the viscosity is 800-120025°C, cs, and the surface tension is 22-25 (25°C, mN / m).

[0083] Preferably, the active monomers are 1,6-hexanediol diacrylate and acryloylmorpholine.

[0084] Preferably, the polyethylene wax in step S2 has a fineness of less than 5 um.

[0085] Example 5

[0086] The finished ink products finally obtained in the above four embodiments were respectively coated on the surface of the reflective film substrate using a 250-mesh anilox roller, and the adhesion, acid and alkali resistance, aging resistance, alcohol resistance and other properties were tested after LED light curing:

[0087]

[0088] In conclusion, the above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A method for preparing a light-curing flexographic printing ink for outdoor reflective film, characterized in that: The steps include: S1. Take 70 to 85 parts of active monomer, 10 to 15 parts of ternary copolymer resin, 1 to 1.5 parts of dispersant, 0.1 to 0.2 parts of inhibitor, 10 to 15 parts of highly light-resistant transparent organic pigment, stir at a speed of 7 to 10 m / s for 2 hours, then transfer to a grinder for grinding, the fineness reaches less than 5 microns, and obtain a color paste for standby use; S2. Take 20 to 30 parts of polyurethane-modified acrylic polymer, 20 to 30 parts of polyester-modified acrylic polymer, 5 to 10 parts of active amine polymer, 25 to 30 parts of active monomer, 3 to 5 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2 to 4 parts of 1-hydroxycyclohexyl phenyl ketone, 2 to 4 parts of 1-phenyl-1,2-propanedione, 0.2 to 0.5 parts of polyethylene wax, 0.5 to 1 parts of defoaming agent, 0.5 to 1 parts of leveling agent, disperse at a high speed of 7 to 10 m / s for 30 minutes to obtain ink vehicle varnish, cool and shield from light for standby use; S3. Take 30-40 parts of the color paste obtained in step S1 and 60-70 parts of the ink vehicle varnish obtained in step S2, stir at a low linear speed of 3-5 m / s for 10 minutes, let stand for 2 hours to defoam, and obtain the finished product.

2. The method for preparing a light-curable flexographic printing ink for outdoor reflective film according to claim 1, characterized in that: The terpolymer resin is a vinyl chloride vinyl acetate maleic anhydride copolymer or a vinyl chloride vinyl acetate vinyl alcohol copolymer.

3. The method for preparing a light-curable flexographic printing ink for outdoor reflective film according to claim 1, characterized in that: The highly light-resistant transparent organic pigment in step S1 is one of PY180 yellow, PR122 red, PB15:4 phthalocyanine blue, and 7# pigment carbon black.

4. The method for preparing a light-curable flexographic printing ink for outdoor reflective film according to claim 1, characterized in that: The polyurethane modified acrylic polymer in step S2 has a functionality of 2 to 3, a TG value of 22 to 25° C., a tensile strength of 1000 to 1200, and an elongation of 81%.

5. The method for preparing a light-curable flexographic printing ink for outdoor reflective film according to claim 1, characterized in that: The polyester-modified acrylic polymer in step S2 has a functionality of 2 to 3, a tensile strength of 1.1, and an elongation at break of 20.5%.

6. The method for preparing a light-curable flexographic printing ink for outdoor reflective film according to claim 1, characterized in that: The active amine polymer in step S2 is a tertiary amine polymer containing a reactive group, with a molecular weight of 250-270 g / mol, a TG value of 10-15° C., and an amine value of 120-150.

7. The method for preparing a light-curable flexographic printing ink for outdoor reflective film according to claim 1, characterized in that: The inhibitor in step S1 is one of N-nitroso-N-phenylhydroxylamine aluminum, hydroquinone, p-tetraoxyphenol, and N-nitrophenylhydroxylamine aluminum salt.

8. The method for preparing a light-curable flexographic printing ink for outdoor reflective film according to claim 1, characterized in that: The leveling agent in step S2 is polyether-modified polydimethylsiloxane, the solid content of the polyether-modified polydimethylsiloxane is 100%, the viscosity is 800-1200 (25° C., cs), and the surface tension is 22-25 (25° C., mN / m).

9. The method for preparing a light-curable flexographic printing ink for outdoor reflective film according to claim 1, characterized in that: The active monomers are one or two of 1,6-hexanediol diacrylate and acryloylmorpholine.

10. The method for preparing a light-curable flexographic printing ink for outdoor reflective film according to claim 1, characterized in that: The polyethylene wax in step S2 has a fineness of less than 5 um.

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