Coating type reflecting film and preparation method thereof

Abstract

The invention relates to the technical field of polyester films, in particular to a coating type reflecting film and a preparation method thereof.The coating type reflecting film comprises a reflecting polyester film, the surface of the reflecting polyester film is coated with a coating layer, and the coating layer is bonded to the surface of the reflecting polyester film after being dried and cured through coating liquid; the coating liquid comprises the following substances in percentage by weight: 20-40% of matrix resin, 1-20% of modified organic particles, 1-5% of a curing agent, 1-3% of a dispersing agent and 32-77% of a solvent; wherein the modified organic particles are products obtained by melt blending of an organic salt antistatic agent and organic particles; the addition amount of the organic salt antistatic agent is 0.1-5% of the weight of the organic particles. The coating type emission film has the effects of adsorption resistance and scratch resistance, and meanwhile the problem that the antistatic agent is separated out on the surface of the reflection film is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of polyester films and relates to a coating type reflective film and a preparation method thereof. Background Art

[0002] Liquid crystal display technology is the most common display technology and has occupied a dominant position in the display field. The liquid crystal backlight is a light source located behind the liquid crystal display (LCD). Its luminous effect will directly affect the visual effect of the liquid crystal display module (LCM). The liquid crystal backlight module mainly includes components such as light source, reflective film, light guide plate, diffusion film, brightness enhancement film and outer frame. In the liquid crystal backlight module, the reflective film is located at the bottom of the backlight module, below the light guide plate. Its function is to reflect the light that leaks through the light guide plate to the bottom back to the panel side, thereby reducing light loss and increasing the backlight brightness. As the size of liquid crystal displays becomes thinner and lighter, the reflective film and the light guide plate often come into contact or adsorb and scratch, thereby scratching the light guide plate or producing shadows.

[0003] In order to solve the above problems, Chinese invention patent CN 107033695 B discloses an antistatic coating liquid and an antistatic reflective film and a preparation method thereof. This method coats nanosilver on the reflective film to make it have an antistatic effect, but the cost of nanosilver is high, and the dispersion requirements of nanosilver are high, and it is easy to agglomerate, resulting in uneven antistatic performance. Another Chinese invention patent CN 106908885 B discloses an anti-adsorption coated reflective film. This method coats large-diameter flexible particles on the surface of the reflective film to manufacture an isolation layer to achieve the purpose of anti-adsorption, but the production and cutting process of the reflective film will generate a large amount of static electricity. If the reflective film itself does not have antistatic properties, it will still adsorb light guide plates or adsorb cutting debris and dust. The lowest cost and most conventional method is to add an antistatic agent to the coating layer, but due to the protrusion of the particles, the antistatic effect will be reduced, and a large amount of antistatic agent often needs to be added, which will cause the precipitation of the antistatic agent, thereby affecting the use of the reflective film. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a coated reflective film and a preparation method thereof, wherein organic particles are modified, an organic salt antistatic agent is blended and modified with the organic particles, and a raised coating of organic particles with antistatic properties is formed on the surface of the reflective film after coating and drying, thereby achieving the effects of anti-adsorption and scratch resistance, and solving the problem of precipitation of the antistatic agent on the surface of the reflective film.

[0005] In order to achieve the above technical purpose, the technical solution adopted by the present application is a coated reflective film, which includes a reflective polyester film, a coating layer is coated on the surface of the reflective polyester film, and the coating layer is bonded to the surface of the reflective polyester film after being dried and cured by a coating liquid; the coating liquid includes the following substances in percentage by weight:

[0006] Main resin 20-40%

[0007] Modified organic particles 1-20%

[0008] Curing agent 1-5%

[0009] Dispersant 1-3%

[0010] Solvent 32-77%;

[0011] The modified organic particles are the product of melt blending of an organic salt antistatic agent and organic particles; the addition amount of the organic salt antistatic agent is 0.1-5% of the weight of the organic particles.

[0012] As an improved technical solution of the present application, the glue layer thickness of the coating layer is 3-9 μm, and the particle size of the modified organic particles is 10-60 um.

[0013] As an improved technical solution of the present application, the organic particles are selected from one or more of polymethyl methacrylate (PMMA), polybutyl methacrylate (PBMA), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycarbonate (PC), and polyamide (PA) in any weight ratio.

[0014] As an improved technical solution of the present application, the organic salt antistatic agent is one or more of tri-n-butyloctylphosphine bis(trifluoromethanesulfonyl)imide salt, bis(trifluoromethanesulfonyl)imide lithium, 1-ethyl-3-methylimidazolium hexafluorophosphate, and 1-ethyl-3-methylimidazolium diethyl phosphate salt in any weight ratio.

[0015] As an improved technical solution of the present application, the main resin is selected from one or more of acrylic resin, polyester resin and polyurethane resin in any weight ratio.

[0016] As an improved technical solution of the present application, the curing agent is one of blocked isocyanate, amino resin, epoxy resin or multiple thereof in any weight ratio.

[0017] As an improved technical solution of the present application, the dispersant is one of alkylammonium salt solutions of polyhydroxy acids, modified polyurethane solutions, polyester-modified polyolefin imine solutions, or multiple thereof in any weight ratio.

[0018] As an improved technical solution of the present application, the preparation method of the modified organic particles comprises the following steps:

[0019] (1) Modification of organic particles by organic salt antistatic agent

[0020] The organic particles were dried by forced air at 100°C for 12 h;

[0021] The organic particles and the organic salt antistatic agent are placed in a blending granulator and melt-extruded at 240°C;

[0022] After cooling and pelletizing, modified organic particle slices are obtained;

[0023] (2) The modified organic particles are sliced, ground, sieved and filtered to obtain modified organic particles of different particle sizes.

[0024] As an improved technical solution of the present application, the solvent is one of toluene, ethyl acetate, butyl acetate, and butanone, or multiple thereof in any weight ratio.

[0025] Another object of the present application is to provide a method for preparing a coated reflective film, comprising the following steps:

[0026] (1) The solvent, main resin, dispersant, modified organic particles, and curing agent are weighed and added to a stirring barrel in sequence at a stirring speed of 300 to 1000 rpm / min for 60 minutes to mix evenly to obtain a mixed coating liquid;

[0027] (2) The mixed coating liquid is evenly coated on the surface of the reflective film by a gravure roller, and dried and solidified in an oven at 130° C. to form a coating layer, which is then cooled and rolled up to obtain a coated reflective film.

[0028] Beneficial Effects

[0029] (1) The present invention adds organic particles modified by an organic salt antistatic agent to the coating layer. The antistatic agent migrates to the surface of the organic particles, making them have antistatic properties. When the antistatic agent on the surface of the particles is missing or damaged, the antistatic molecules inside the organic particles can continue to migrate outward to supplement, thereby having a more sustained antistatic effect.

[0030] (2) The protrusions of the modified organic particles on the coating surface have a certain effect of preventing adsorption, but the protruding organic particles have an antistatic effect, which more effectively reduces the surface resistivity of the coating layer and further improves the anti-adsorption performance. Therefore, compared with the prior art, although the particles of this technical solution are protruding, the antistatic effect after protrusion is actually improved.

[0031] (3) Since it is no longer necessary to add an antistatic agent to the coating solution, and the amount of antistatic agent added to the organic particles modified with an organic salt antistatic agent is relatively small, it not only reduces the cost but also solves the problem of antistatic agent precipitation.

[0032] (4) Organic particles modified with organic salt antistatic agents. The addition of antistatic agents can also make the organic particles have a lubricating effect, reduce friction, lower the friction coefficient and improve the scratch resistance of the particles, while also reducing and inhibiting the generation of static charges. DETAILED DESCRIPTION

[0033] The present application provides a coated reflective film, which comprises a reflective polyester film, a coating layer coated on the surface of the reflective polyester film, and the coating layer is bonded to the surface of the reflective polyester film after the coating liquid is dried and solidified;

[0034] The coating solution includes the following substances in percentage by weight:

[0035] Main resin 20-40%

[0036] Modified organic particles 1-20%

[0037] Curing agent 1-5%

[0038] Dispersant 1-3%

[0039] Solvent 32-77%.

[0040] The main resin is selected from one of acrylic resin, polyester resin, polyurethane resin or multiple resins in any weight ratio. The main resin is used as a film-forming material for the coating layer, wraps the modified organic particles, and after cross-linking and curing with a curing agent, can be well bonded to the reflective film, so that the coating layer has very excellent weather resistance and adhesion.

[0041] The modified organic particles are the product of melt blending of an organic salt antistatic agent and organic particles. The preparation method of the modified organic particles comprises the following steps:

[0042] (1) Modification of organic particles by organic salt antistatic agent

[0043] The organic particles were dried by blast drying at 100° C. for 12 h, respectively, in order to remove moisture from the organic particles after being fully dried, thereby facilitating melt extrusion and reducing degradation of the organic particles during the melt extrusion process.

[0044] The organic particles and the organic salt antistatic agent are placed in a blending granulator and melt-extruded at 240° C. The purpose is to blend and disperse the organic particles with the organic salt antistatic agent more evenly in a molten state.

[0045] After cooling and pelletizing, modified organic particle slices are obtained.

[0046] (2) The modified organic particles are sliced, ground, sieved and filtered to obtain modified organic particles of different particle sizes.

[0047] The organic salt antistatic agent is added in an amount of 0.1-5% of the weight of the organic particles.

[0048] The coating layer has a glue layer thickness of 3-9 μm and a particle size of the modified organic particles of 10-60 μm. Definition: The coating layer is a coating formed by the modified organic particles distributed in the glue layer; wherein the glue layer is a coating formed by the portion of the coating liquid that does not contain the modified organic particles.

[0049] The modified organic particles have their own antistatic effect. The modified organic particles protrude from the glue layer, which has a better antistatic effect and effectively avoids the problem of antistatic agent precipitation. The antistatic agents in the prior art are all added to the coating liquid. After the particles protrude, the glue layer cannot completely wrap the particles, resulting in poor antistatic effect. Often, a lot of antistatic agents need to be added to achieve the effect, which will cause the antistatic agent to precipitate and affect the use of the reflective film.

[0050] The organic particles are selected from one or more of polymethyl methacrylate (PMMA), polybutyl methacrylate (PBMA), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycarbonate (PC), and polyamide (PA). The organic particles have extremely high light transmittance, will not reduce reflectivity, and have excellent wear resistance and chemical corrosion resistance.

[0051] As an improved technical solution of the present application, the organic salt antistatic agent is one of tri-n-butyloctylphosphine bis(trifluoromethanesulfonyl)imide salt, bis(trifluoromethanesulfonyl)imide lithium, 1-ethyl-3-methylimidazole hexafluorophosphate, and 1-ethyl-3-methylimidazole diethyl phosphate salt, or multiple of any weight ratio. On the one hand, the organic salt antistatic agent has high conductivity, can effectively reduce the resistivity of the polymer, has good compatibility with the polymer, is more evenly dispersed, and does not affect the transparency of the polymer. On the other hand, the organic salt antistatic agent is added to the polymer to have a lubricating effect, can reduce friction, reduce the friction coefficient, improve the scratch resistance of the particles, and also reduce and inhibit the generation of static charge.

[0052] Among them, tri-n-butyloctylphosphine bis(trifluoromethanesulfonyl)imide salt, manufacturers such as Solvay Group. Lithium bis(trifluoromethanesulfonyl)imide, manufacturers such as Solvay Group. Ethyl-3-methylimidazolium bis(fluorosulfonyl)imide salt, manufacturers such as Zhejiang Lande New Energy Technology Development Co., Ltd. 1-Ethyl-3-methylimidazolium diethyl phosphate salt, manufacturers such as Zhejiang Lande New Energy Technology Development Co., Ltd.

[0053] As an improved technical solution of the present application, the curing agent is one or more of blocked isocyanate, amino resin and epoxy resin in any weight ratio. The curing agent reacts with the main resin at high temperature to form a three-dimensional network structure, so that the coating layer has better bonding performance and weather resistance.

[0054] As an improved technical solution of the present application, the dispersant is one or more of polyhydric hydroxy acid alkyl ammonium salt solution (such as product BYK203), modified polyurethane solution (such as product BYK168), polyester modified polyolefin imine solution (such as product BYK2159) in any weight ratio. The addition of the dispersant can effectively help the modified organic particles in the coating liquid to disperse uniformly, prevent the particles from agglomerating and causing sedimentation, and avoid uneven distribution of particles in the coating layer, which affects the anti-adsorption and antistatic effects.

[0055] The solvent is one of toluene, ethyl acetate, butyl acetate and butanone or multiple thereof in any weight ratio.

[0056] A method for preparing a coating type reflective film comprises the following steps:

[0057] (1) The solvent, main resin, dispersant, modified organic particles, and curing agent are weighed and added to a stirring barrel in sequence, and the stirring speed is 300 to 1000 rpm / min. The mixture is stirred for 60 minutes to be uniformly mixed to obtain a mixed coating liquid. The stirring speed is 300 to 1000 rpm / min in order to improve the dispersion effect of the particles.

[0058] (2) The mixed coating liquid is evenly coated on the surface of the reflective film by a gravure roller, and dried and solidified in an oven at 130° C. to form a coating layer, which is then cooled and rolled up to obtain a coated reflective film.

[0059] The technical solution of the present application is described in detail and completely below in conjunction with specific embodiments.

[0060] Example 1

[0061] A coating type reflective film is prepared according to the following steps:

[0062] (1) 69% solvent toluene, 20% acrylic resin, 1% dispersant BYK203, 5% modified organic PET particles, and 5% curing agent amino resin were weighed and added to a stirring barrel in sequence, stirred at a speed of 300 rpm / min, and stirred for 60 minutes to mix evenly to obtain a mixed coating liquid;

[0063] (2) The mixed coating liquid is evenly coated on the surface of the reflective film through a gravure roller, and is dried and solidified in an oven at 130° C. to form a coating layer. After cooling and rolling, a coated reflective film is obtained, and the thickness of the glue layer is 9 μm.

[0064] The preparation method of modified organic PET particles is as follows:

[0065] (1) drying the organic PET particles at 100° C. for 12 h; placing the organic PET particles and the organic salt antistatic agent tri-n-butyl octyl phosphine bis-trifluoromethanesulfonyl imide salt in a blending granulator for melt extrusion at 240° C., wherein the amount of the tri-n-butyl octyl phosphine bis-trifluoromethanesulfonyl imide salt added is 0.1% of the weight of the organic PET particles; cooling and pelletizing to obtain modified organic particle slices;

[0066] (2) The modified organic particles are sliced, ground, sieved and filtered to obtain modified organic PET particles with a particle size of 60 μm.

[0067] Example 2

[0068] A coating type reflective film is prepared according to the following steps:

[0069] (1) 51% solvent butyl acetate, 30% polyurethane resin, 2% dispersant BYK168, 15% modified organic PMMA particles, and 2% curing agent blocked isocyanate were weighed and added to a stirring barrel in sequence, stirred at a speed of 600 rpm / min, and stirred for 60 minutes to mix evenly to obtain a mixed coating liquid;

[0070] (2) The mixed coating liquid is evenly coated on the surface of the reflective film through a gravure roller, and is dried and solidified in an oven at 130° C. to form a coating layer. After cooling and rolling, a coated reflective film is obtained, and the thickness of the glue layer is 6 μm.

[0071] The preparation method of modified organic PMMA particles is as follows:

[0072] (1) drying the organic PMMA particles at 100° C. for 12 h; placing the organic PMMA particles and an organic salt antistatic agent, lithium bis(trifluoromethanesulfonyl imide) in a blending granulator and melt-extruded at 240° C., wherein the amount of lithium bis(trifluoromethanesulfonyl imide added is 1% of the weight of the organic PMMA particles; cooling and pelletizing to obtain modified organic particle slices;

[0073] (2) The modified organic particles are sliced, ground and sieved to obtain modified organic PMMA particles with a particle size of 10 μm.

[0074] Example 3

[0075] A coating type reflective film is prepared according to the following steps:

[0076] (1) Weigh 40% toluene and 37% butanone as solvent, 20% acrylic resin, 1% dispersant BYK2159, 1% modified organic PC particles, and 1% epoxy resin as curing agent, and add them to a stirring barrel in sequence, stirring at a speed of 800 rpm / min for 60 minutes to mix evenly, thereby obtaining a mixed coating liquid;

[0077] (2) The mixed coating liquid is evenly coated on the surface of the reflective film through a gravure roller, and is dried and solidified in an oven at 130° C. to form a coating layer. After cooling and rolling, a coated reflective film is obtained, and the thickness of the glue layer is 5 μm.

[0078] The preparation method of modified organic PC particles is as follows:

[0079] (1) drying the organic PC particles at 100° C. for 12 h; placing the organic PC particles and the organic salt antistatic agent 1-ethyl-3-methylimidazolium hexafluorophosphate in a blending granulator for melt extrusion at 240° C., wherein the amount of the 1-ethyl-3-methylimidazolium hexafluorophosphate added is 2.5% of the weight of the organic PC particles; cooling and pelletizing to obtain modified organic particle slices;

[0080] (2) The modified organic particles are sliced, ground and sieved to obtain modified organic PC particles with a particle size of 25 μm.

[0081] Example 4

[0082] A coating type reflective film is prepared according to the following steps:

[0083] (1) Weigh 32% ethyl acetate solvent, 40% polyester resin, 1% BYK203 and 2% BYK168 dispersants, 20% modified organic PA particles, and 5% epoxy resin curing agent, and add them to a stirring barrel in sequence. Stir at a speed of 1000 rpm / min for 60 minutes to mix evenly to obtain a mixed coating liquid;

[0084] (2) The mixed coating liquid is evenly coated on the surface of the reflective film through a gravure roller, and is dried and solidified in an oven at 130° C. to form a coating layer. After cooling and rolling, a coated reflective film is obtained, and the thickness of the glue layer is 9 μm.

[0085] The preparation method of modified organic PA particles is as follows:

[0086] (1) drying the organic PA particles at 100° C. for 12 h; placing the organic PA particles and the organic salt antistatic agent 1-ethyl-3-methylimidazole diethyl phosphate in a blending granulator for melt extrusion at 240° C., wherein the amount of the 1-ethyl-3-methylimidazole diethyl phosphate added is 5% of the weight of the organic PA particles; cooling and pelletizing to obtain modified organic particle slices;

[0087] (2) The modified organic particles are sliced, ground and sieved to obtain modified organic PA particles with a particle size of 40 μm.

[0088] Comparative Example 1

[0089] The same as Example 1, except that, in Comparative Example 1, unmodified organic PET particles are used to replace the modified organic PET particles in Example 1. The particle size of the unmodified organic PET particles is 60 um.

[0090] Comparative Example 2

[0091] The same as Example 1, except that unmodified organic PET particles are used to replace the modified organic PET particles in Example 1, and an organic salt antistatic agent is added to the coating liquid.

[0092] A coating type reflective film is prepared according to the following steps:

[0093] (1) 68% solvent toluene, 20% acrylic resin, 1% dispersant BYK203, 5% unmodified organic PET particles, 5% curing agent amino resin, and 1% organic salt antistatic agent tri-n-butyl octylphosphine bistrifluoromethanesulfonyl imide salt were weighed and added to a stirring barrel in sequence, stirred at a speed of 300 rpm / min, and stirred for 60 minutes to mix evenly to obtain a mixed coating liquid;

[0094] (2) The mixed coating liquid is evenly coated on the surface of the reflective film through a gravure roller, and is dried and solidified in an oven at 130° C. to form a coating layer. After cooling and rolling, a coated reflective film is obtained, and the thickness of the glue layer is 9 μm.

[0095] The preparation method of unmodified organic PET particles is as follows:

[0096] (1) drying the organic PET particles at 100° C. for 12 h; placing the organic PET particles in a blending granulator for melt extrusion at 240° C., cooling and pelletizing to obtain unmodified organic particle slices;

[0097] (2) The unmodified organic particles are sliced, ground, sieved and filtered to obtain unmodified organic PET particles with a particle size of 60 μm.

[0098] Comparative Example 3

[0099] The same as Example 1, except that, in Comparative Example 3, the antistatic agent ethoxylated alkylamine is used to replace the organic salt antistatic agent tri-n-butyl octylphosphine bistrifluoromethanesulfonyl imide salt in Example 1. The preparation method of the modified organic PET particles is as follows:

[0100] (1) drying the organic PET particles at 100° C. for 12 h; placing the organic PET particles and the antistatic agent oleic acid polyethylene glycol ester in a blending granulator for melt extrusion at 240° C., wherein the amount of the oleic acid polyethylene glycol ester added is 0.1% of the weight of the organic PET particles; cooling and pelletizing to obtain modified organic particle slices;

[0101] (2) The modified organic particles are sliced, ground, sieved and filtered to obtain modified organic PET particles with a particle size of 60 μm.

[0102] Performance Testing

[0103] Relevant performance tests were performed on the coated reflective films obtained in Examples 1-4 and Comparative Examples 1-3. The specific test results are shown in Table 1.

[0104] Reflectivity test: Tested in accordance with GB / T 3979-2008 standard.

[0105] Surface resistance test: Test the surface resistance of the reflective film according to GB / T 31838.3-2019 standard. If the test result is ≥10 13 Ω, it indicates no antistatic performance. The lower the test result value, the better the antistatic performance, which means the better the anti-adsorption performance.

[0106] Anti-adsorption test: Place the coated reflective film sample into the backlight module, and observe whether there is a shadow after turning on the light. If there is a shadow, it means that the reflective film has poor adsorption.

[0107] Anti-scratch performance test: Use a wear-resistant testing machine to test, fix the light guide plate, press a 500g metal weight on the upper part of the reflective film and the light guide plate, the coating surface of the reflective film is in contact with the light guide plate, and the reflective film is rubbed back and forth 50 times. If linear scratches appear, it is unqualified, and if there are no linear scratches, it is qualified.

[0108] High temperature and high humidity test: Under the condition of 60℃ and 90% temperature and humidity, the coated reflective film is placed under this condition for 1000 hours, then taken out and observed to see if there is oil stain on the surface. If there is oil stain, the antistatic agent has precipitated. The reflectivity change after high temperature and high humidity is tested according to GB / T 3979-2008 standard.

[0109] Table 1 Performance test results

[0110]

[0111]

[0112] Note: In Table 1, ○: the reflective film has excellent anti-adsorption performance; △: the reflective film has average anti-adsorption performance; ×: the reflective film has poor anti-adsorption performance.

[0113] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A coating type reflective film, characterized in that: The coated reflective film comprises a reflective polyester film, the surface of which is coated with a coating layer, the coating layer being bonded to the surface of the reflective polyester film after being dried and cured by a coating liquid; the coating liquid comprises the following substances in percentage by weight: Main resin 20-40% Modified organic particles 1-20% Curing agent 1-5% Dispersant 1-3% Solvent 32-77%; The modified organic particles are the product of melt blending of an organic salt antistatic agent and organic particles; the addition amount of the organic salt antistatic agent is 0.1-5% of the weight of the organic particles.

2. A coating type reflective film according to claim 1, characterized in that: The glue layer thickness of the coating layer is 3-9 μm, and the particle size of the modified organic particles is 10-60 μm.

3. A coating type reflective film according to claim 1, characterized in that: The organic particles are selected from one or more of polymethyl methacrylate (PMMA), polybutyl methacrylate (PBMA), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycarbonate (PC), and polyamide (PA) in any weight ratio.

4. The coating type reflective film according to claim 1, characterized in that: The organic salt antistatic agent is one of tri-n-butyloctylphosphine bis(trifluoromethanesulfonyl)imide salt, bis(trifluoromethanesulfonyl)imide lithium, 1-ethyl-3-methylimidazolium hexafluorophosphate, and 1-ethyl-3-methylimidazolium diethyl phosphate salt, or multiple thereof in any weight ratio.

5. The coating type reflective film according to claim 1, characterized in that: The main resin is selected from one of acrylic resin, polyester resin and polyurethane resin or multiple resins in any weight ratio.

6. The coating type reflective film according to claim 1, characterized in that: The curing agent is one or more of blocked isocyanate, amino resin and epoxy resin in any weight ratio.

7. The coating type reflective film according to claim 1, characterized in that: The dispersant is one of alkylammonium salt solution of polyhydroxy acid, modified polyurethane solution, polyester modified polyolefin imine solution or multiple thereof in any weight ratio.

8. The coating type reflective film according to claim 1, characterized in that: The preparation method of the modified organic particles comprises the following steps: (1) Modification of organic particles by organic salt antistatic agent The organic particles were dried by forced air at 100°C for 12 h; The organic particles and the organic salt antistatic agent are placed in a blending granulator and melt-extruded at 240°C; After cooling and pelletizing, modified organic particle slices are obtained; (2) The modified organic particles are sliced, ground, sieved and filtered to obtain modified organic particles of different particle sizes.

9. The coating type reflective film according to claim 1, characterized in that: The solvent is one of toluene, ethyl acetate, butyl acetate and butanone or multiple thereof in any weight ratio.

10. A method for preparing a coating type reflective film according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) The solvent, main resin, dispersant, modified organic particles, and curing agent are weighed and added to a stirring barrel in sequence at a stirring speed of 300 to 1000 rpm / min for 60 minutes to mix evenly to obtain a mixed coating liquid; (2) The mixed coating liquid is evenly coated on the surface of the reflective film by a gravure roller, and dried and solidified in an oven at 130° C. to form a coating layer, which is then cooled and rolled up to obtain a coated reflective film.

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