Modified acrylic polyester resin applied to silver reflecting film and coating thereof

Abstract

The invention belongs to the field of optical materials, and particularly relates to modified acrylic polyester resin applied to a silver reflecting film and a coating of the modified acrylic polyester resin. Modified acrylic polyester resin is prepared from specific linear saturated polyester resin and acrylic resin; the coating prepared from the modified acrylic polyester resin has strong adhesive force and is not easy to fall off or peel off, especially when the coating is applied to a silver reflecting film, the coating can be rapidly cured to generate excellent adhesive force, has good inertia, is not easy to bond and has excellent salt fog resistance, and the coating does not react with the coating after metal evaporation; and the prepared silver reflecting film is high in film transmittance, has relatively high surface brightness and is suitable for industrial production.

Description

Technical Field

[0001] The invention belongs to the field of optical materials, and in particular relates to a modified acrylic polyester resin and a coating thereof applied to a silver reflective film. Background Art

[0002] PET film (polyester film) is widely used in optical films in recent years, for example, in base films or silver reflective films for brightness enhancement sheets, touch panels, backlights, etc. used in liquid crystal display devices. The base films used in such applications are required to have excellent transparency and good adhesion to the adhesive coating provided on the base films.

[0003] Optical grade PET polyester film can be made into optical films with different functions by applying different coatings on PET polyester film. However, PET film, especially PET polyester film made by biaxial stretching, has fewer active points of contact between the coating and the surface of the film substrate, which makes it difficult for the coating liquid to penetrate and form adsorption with it.

[0004] Secondly, the highly oriented crystals on the surface of the PET film make it difficult for the coating molecules to penetrate into the PET film, and it is also difficult to form a good interface adhesion with the coating. Generally, the adhesion is worse than that of other materials, such as the coating with acrylic resin as the main component.

[0005] The current conventional practice is to perform corona treatment on the surface of the polyester film to increase the adhesion of the coating to the substrate. However, this method is not only time-consuming and labor-intensive, but also seriously affects the transparency of the coating and has a great impact on the brightness and color difference of the reflective film layer.

[0006] Such as patent<CN 112812701 A> The following mentions nickel-tungsten alloy layer, nickel-chromium alloy layer, nickel-copper alloy layer, nickel-titanium alloy layer, chromium-titanium alloy layer, chromium-tungsten alloy layer, or chromium-copper alloy layer. All of the above are metal coatings. When the thickness of the following layer is in the range of 10nm to 1μm, it can show good adhesion and transparency. In the process of silver-plating the silver reflective film, a high-temperature evaporation process is usually used. The polymer resin film layer currently used cannot withstand long-term high-temperature evaporation tests.

[0007] However, the thermal expansion coefficient of the metal oxide coating film is almost half of that of the silver layer, so cracking will cause a decrease in yield during high-temperature evaporation. It also consumes a lot of energy and is extremely costly, making it unsuitable for large-scale production. Summary of the invention

[0008] In order to achieve the above object, the first aspect of the present invention discloses a modified acrylic polyester resin, comprising the following components in parts by weight:

[0009] The basic raw material of the modified acrylic polyester resin includes 50 to 60 parts by weight of acrylic resin and 5 to 15 parts by weight of linear saturated polyester resin; the linear saturated polyester resin is polyethylene glycol monolaurate or polypropylene glycol monolaurate;

[0010] 50-60 parts by weight of the acrylic resin and 5-15 parts by weight of the linear saturated polyester resin are put into a reaction kettle, and the temperature is controlled between 80 and 90° C. After the linear saturated polyester resin is completely dissolved, a chain extender is added to carry out polymerization reaction, and the reaction is carried out for 5-6 hours; then, the reaction is sealed and pressurized to 2-3 standard atmospheric pressures, and the temperature is maintained to continue the reaction for 2-4 hours; then, normal pressure is restored, an organic solvent is added to dilute, and the temperature is slowly lowered to 40-30 degrees Celsius, and the cooling rate is controlled at 8-12 degrees / hour, and finally the modified acrylic polyester resin is obtained;

[0011] The chain extender is selected from any one of 1,4-butanediol (BDO), 1,6-hexanediol, glycerol, trimethylolpropane, diethylene glycol (DEG), triethylene glycol, neopentyl glycol (NPG), sorbitol or diethylaminoethanol (DEAE) or a combination thereof; the organic solvent is selected from any one of butanone, acetone, toluene, ethyl acetate, xylene or a combination thereof.

[0012] The synthetic raw materials of the acrylic resin include the following components in parts by weight: 3-5 parts of acrylic acid; 8-10 parts of 2-hydroxyethyl methacrylate; 15-30 parts of butyl acrylate; 8-15 parts of methyl methacrylate; 8-15 parts of styrene; 11-13 parts of high refractive index monomer; 2-3 parts of dibenzoyl peroxide; 26-35 parts of propylene glycol methyl ether acetate;

[0013] The high refractive index monomer is selected from any one of zirconium acrylate, hafnium carboxyethyl acrylate, bromonorbornane lactone triacrylate zirconium carboxylate, or polyethylene glycol o-phenylphenyl ether acrylate or a combination thereof.

[0014] The second aspect of the present invention discloses a method for preparing the acrylic resin, and the specific steps are as follows:

[0015] S1, placing the propylene glycol methyl ether acetate in a reaction vessel, stirring and heating to 90-92° C.;

[0016] S2, acrylic acid, 2-hydroxyethyl methacrylate, butyl acrylate, methyl methacrylate, styrene, high refractive index monomer, dibenzoyl peroxide are mixed, and then added dropwise to the reaction container in step S1 for 6 to 8 hours, and stirred for reaction at a reaction temperature of 90 to 92°C;

[0017] S3. After the dropwise addition is completed, the heating is stopped and stirring is continued for 2 to 4 hours. When the system temperature drops below 45 degrees, the reaction liquid is poured out to obtain acrylic resin.

[0018] The third aspect of the present invention discloses a coating, which is prepared using the above-mentioned modified acrylic polyester resin as a basic raw material.

[0019] The coating comprises the following components in parts by weight: 40-50 parts of the modified acrylic resin, 10-15 parts of a single-component curing agent, 0.5-1 part of a leveling agent, 0.5-1 part of a substrate wetting agent, and 40-50 parts of butyl acetate;

[0020] The one-component curing agent is a blocked aliphatic polyisocyanate, and its deblocking temperature is 70°C; the leveling agent is a polyether-modified silicone; the substrate wetting agent is a nonylphenol polyoxyethylene compound; and the nonylphenol polyoxyethylene compound includes nonylphenol polyoxyethylene ether.

[0021] Preferably, the blocking agent used in the preparation of the blocked aliphatic polyisocyanate is selected from the group consisting of cresol, ethylphenol, n-propol, isopropol, n-butylphenol, sec-butylphenol, tert-butylphenol, n-hexylphenol, 2-ethylhexylphenol, n-octylphenol, n-nonylphenol, di-n-propol, diisopropol, isopropylcresol, di-n-butylphenol, di-sec-butylphenol, di-tert-butylphenol, di-n-octylphenol, di-2-ethylhexylphenol, di-n-nonylphenol, nitrophenol, bromophenol, chlorophenol, fluorine Any one of phenol, xylenol, styrenated phenol, methyl salicylate, methyl 4-hydroxybenzoate, benzyl 4-hydroxybenzoate, 2-ethylhexyl hydroxybenzoate, 4-[(dimethylamino)methyl]phenol, 4-[(dimethylamino)methyl]nonylphenol, bis(4-hydroxyphenyl)acetic acid, 2-hydroxypyridine (dissociation temperature 80°C), 2- or 8-hydroxyquinoline, 2-chloro-3-pyridinol or pyridine-2-thiol.

[0022] The fourth aspect of the present invention discloses the use of the above-mentioned coating in the preparation of an optical film, wherein the coating is coated on the surface of the optical film as a protective layer.

[0023] Preferably, the optical film is a silver reflective film.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The invention prepares a modified acrylic polyester resin by using a specific linear saturated polyester resin and an acrylic resin, and then uses the modified acrylic polyester resin to prepare a coating, which has strong adhesion and is not easy to fall off or peel off. In particular, the coating applied to a silver reflective film can be quickly cured to produce excellent adhesion, has good inertness, is not easy to produce adhesion, has excellent salt spray resistance and durability, does not react with the metal after metal evaporation, and the prepared silver reflective film has high transparency and high surface brightness, and is suitable for industrial production. DETAILED DESCRIPTION

[0026] The technical scheme of the present invention is described in detail below in conjunction with the embodiments, but the present invention is not limited to the scope of the embodiments. The process parameters not specified in the embodiments of the present application can be carried out according to conventional methods, and the raw materials used can be obtained through commercial channels.

[0027] The easy adhesion mentioned in the embodiments specifically refers to strong adhesion and not easy to fall off or peel off.

[0028] Example 1

[0029] The present invention relates to an acrylic resin for easy-adhesion coating, which comprises the following components in parts by weight: 3 parts of acrylic acid; 10 parts of 2-hydroxyethyl methacrylate; 20 parts of butyl acrylate; 8 parts of methyl methacrylate; 8 parts of styrene; 11 parts of polyethylene glycol o-phenylphenyl ether acrylate; 2 parts of dibenzoyl peroxide; and 30-40 parts of solvent.

[0030] In a preferred embodiment, the solvent is propylene glycol methyl ether acetate.

[0031] The invention relates to a method for preparing an acrylic resin for easy-adhesion coating, comprising the following steps: A. placing a solvent in a reaction container, stirring and heating to 90-92°C, wherein the solvent is propylene glycol methyl ether acetate; B. mixing acrylic acid, 2-hydroxyethyl methacrylate, butyl acrylate, methyl methacrylate, styrene, polyethylene glycol o-phenylphenyl ether acrylate and dibenzoyl peroxide, and dripping the mixture into the reaction container in step A for 6-8 hours, stirring for reaction, and the reaction temperature being 90-92°C; C. stopping heating after the dripping is completed, and continuing to stir for 2-4 hours, and when the system temperature drops below 45°C, pouring out the reaction liquid to obtain an easy-adhesion resin semi-finished product.

[0032] The semi-finished acrylic resin product was taken out, and 50 parts of the semi-finished acrylic resin product and 10 parts of linear saturated polyester resin (polyethylene glycol monolaurate) were put into a stirring kettle, and the temperature was controlled between 80 and 90 degrees. After the linear saturated polyester resin was completely dissolved, a chain extender was added to carry out a polymerization reaction. After 5 to 6 hours of reaction, the pressure was sealed and pressurized to 2.5 bar. The temperature was maintained and the reaction was continued for 3 hours. Then, butanone was added to dilute and the temperature was slowly lowered to 35 degrees. The cooling rate was controlled at 10 degrees / hour. After reaching the specified temperature, the pressure was broken and the temperature was dropped to room temperature. The mixture was continuously dispersed, stirred and dissolved. After confirming that there was no colloid, the material was filtered out to obtain the finished product of easy-to-bond acrylic modified polyester resin.

[0033] Example 2

[0034] The present invention relates to an acrylic resin for easy-adhesion coating, which comprises the following components in parts by weight: 3 parts of acrylic acid; 10 parts of 2-hydroxyethyl methacrylate; 20 parts of butyl acrylate; 8 parts of methyl methacrylate; 8 parts of styrene; 11 parts of zirconium acrylate; 2 parts of dibenzoyl peroxide; and 30-40 parts of solvent.

[0035] In a preferred embodiment, the solvent is propylene glycol methyl ether acetate.

[0036] The invention relates to a method for preparing an acrylic resin for easy-adhesion coating, comprising the following steps: A. placing a solvent in a reaction container, stirring and heating to 90-92°C, wherein the solvent is propylene glycol methyl ether acetate; B. mixing acrylic acid, 2-hydroxyethyl methacrylate, butyl acrylate, methyl methacrylate, styrene, polyethylene glycol o-phenylphenyl ether acrylate and dibenzoyl peroxide, and dripping the mixture into the reaction container in step A for 6 hours, stirring for reaction, and the reaction temperature being 90-92°C; stopping heating after the dripping is completed, and continuing to stir for 4 hours, and when the system temperature drops below 45°C, pouring out the reaction liquid to obtain a semi-finished acrylic resin for easy-adhesion coating.

[0037] The semi-finished acrylic resin product was taken out, and 50 parts of the semi-finished acrylic resin product and 10 parts of linear saturated polyester resin (polyethylene glycol monolaurate) were put into a stirring kettle, and the temperature was controlled between 80 and 90 degrees. After the linear saturated polyester resin was completely dissolved, a chain extender was added to carry out a polymerization reaction. After 5 to 6 hours of reaction, the pressure was sealed and pressurized to 2.5 bar. The temperature was maintained and the reaction was continued for 3 hours. Then, butanone was added to dilute and the temperature was slowly lowered to 35 degrees. The cooling rate was controlled at 10 degrees / hour. After reaching the specified temperature, the pressure was broken and the temperature was dropped to room temperature. The mixture was continuously dispersed, stirred and dissolved. After confirming that there was no colloid, the material was filtered out to obtain the finished product of easy-to-bond acrylic modified polyester resin.

[0038] Example 3

[0039] The present invention relates to an acrylic resin for easy-adhesion coating, which comprises the following components in parts by weight: 3 parts of acrylic acid; 10 parts of 2-hydroxyethyl methacrylate; 20 parts of butyl acrylate; 8 parts of methyl methacrylate; 8 parts of styrene; 11 parts of polyethylene glycol o-phenylphenyl ether acrylate; 2 parts of dibenzoyl peroxide; and 30-40 parts of solvent.

[0040] In a preferred embodiment, the solvent is propylene glycol methyl ether acetate.

[0041] The invention relates to a method for preparing an acrylic resin for easy-adhesion coating, comprising the following steps: A. placing a solvent in a reaction container, stirring and heating to 90-92°C, wherein the solvent is propylene glycol methyl ether acetate; B. mixing acrylic acid, 2-hydroxyethyl methacrylate, butyl acrylate, methyl methacrylate, styrene, polyethylene glycol o-phenylphenyl ether acrylate and dibenzoyl peroxide, and dripping the mixture into the reaction container in step A for 6-8 hours, stirring for reaction, and the reaction temperature being 90-92°C; C. stopping heating after the dripping is completed, and continuing to stir for 2-4 hours, and when the system temperature drops below 45°C, pouring out the reaction liquid to obtain an easy-adhesion resin semi-finished product.

[0042] The semi-finished acrylic resin product was taken out, and 50 parts of the semi-finished acrylic resin product and 10 parts of linear saturated polyester resin (polypropylene glycol monolaurate) were put into a stirring kettle, and the temperature was controlled between 80 and 90 degrees. After the linear saturated polyester resin was completely dissolved, a chain extender was added to carry out a polymerization reaction. After 5 to 6 hours of reaction, the pressure was sealed and pressurized to 2.5 bar. The temperature was maintained and the reaction was continued for 3 hours. Then, butanone was added to dilute and the temperature was slowly lowered to 35 degrees. The cooling rate was controlled at 10 degrees / hour. After reaching the specified temperature, the pressure was broken and the temperature was dropped to room temperature. The mixture was continuously dispersed, stirred and dissolved. After confirming that there was no colloid, the material was filtered out to obtain the finished product of easy-to-bond acrylic modified polyester resin.

[0043] Example 4

[0044] The present invention relates to an acrylic resin for easy-adhesion coating, which comprises the following components in parts by weight: 3 parts of acrylic acid; 10 parts of 2-hydroxyethyl methacrylate; 20 parts of butyl acrylate; 8 parts of methyl methacrylate; 8 parts of styrene; 11 parts of zirconium acrylate; 2 parts of dibenzoyl peroxide; and 30-40 parts of solvent.

[0045] In a preferred embodiment, the solvent is propylene glycol methyl ether acetate.

[0046] The invention relates to a method for preparing an acrylic resin for easy-adhesion coating, comprising the following steps: A. placing a solvent in a reaction container, stirring and heating to 90-92°C, wherein the solvent is propylene glycol methyl ether acetate; B. mixing acrylic acid, 2-hydroxyethyl methacrylate, butyl acrylate, methyl methacrylate, styrene, polyethylene glycol o-phenylphenyl ether acrylate and dibenzoyl peroxide, and dripping the mixture into the reaction container in step A for 6 hours, stirring for reaction, and the reaction temperature being 90-92°C; stopping heating after the dripping is completed, and continuing to stir for 4 hours, and when the system temperature drops below 45°C, pouring out the reaction liquid to obtain a semi-finished acrylic resin for easy-adhesion coating.

[0047] The semi-finished acrylic resin product was taken out, and 50 parts of the semi-finished acrylic resin product and 10 parts of linear saturated polyester resin (polypropylene glycol monolaurate) were put into a stirring kettle, and the temperature was controlled between 80 and 90 degrees. After the linear saturated polyester resin was completely dissolved, a chain extender was added to carry out a polymerization reaction. After 5 to 6 hours of reaction, the pressure was sealed and pressurized to 2.5 bar. The temperature was maintained and the reaction was continued for 3 hours. Then, butanone was added to dilute and the temperature was slowly lowered to 35 degrees. The cooling rate was controlled at 10 degrees / hour. After reaching the specified temperature, the pressure was broken and the temperature was dropped to room temperature. The mixture was continuously dispersed, stirred and dissolved. After confirming that there was no colloid, the material was filtered out to obtain the finished product of easy-to-bond acrylic modified polyester resin.

[0048] In order to achieve the aforementioned purpose and confirm the performance of the easily-adhesive acrylic modified polyester resin, the resin obtained by the above-mentioned embodiment method was used to prepare an easily-adhesive coating to verify the performance.

[0049] The invention relates to a method for preparing an easy-adhesive coating, comprising the following components in parts by weight: 45 parts of acrylic resin for easy-adhesive coating, 11 parts of a single-component curing agent, 0.5 parts of a leveling agent, 0.5 parts of a substrate wetting agent, and 43 parts of a solvent.

[0050] The easy-to-bond coating is characterized in that the one-component curing agent is a blocked aliphatic polyisocyanate, and its unblocking temperature is 70°C. The specific phenolic compound of the blocking agent can be, for example, phenol, cresol, ethylphenol, n-propylphenol, isopropylphenol, n-butylphenol, 2-butylphenol, 3-butylphenol, n-hexylphenol, 2-ethylhexylphenol, n-octylphenol, n-nonylphenol, di-n-propylphenol, diisopropylphenol, isopropylcresol, di-n-butylphenol, di-2-butylphenol, di-3-butylphenol, di-n-octylphenol, di-2-ethylhexylphenol, di-n-nonylphenol, nitrophenol, bromophenol, chlorophenol, fluorophenol, dimethylphenol, styrenated phenol, methyl salicylate, methyl 4-hydroxybenzoate, benzyl 4-hydroxybenzoate, 2-ethylhexyl hydroxybenzoate, 4-[(dimethylamino)methyl]phenol, 4-[(dimethylamino)methyl]phenol, Methylamino)methyl]nonylphenol, bis(4-hydroxybenzene 2-Hydroxypyridine (dissociation temperature 80°C), 2- 8-Hydroxyquinoline, 2-chloro-3-pyridinol, pyridine-2-thiol, etc.

[0051] In the schemes of Examples 1-4, the one-component curing agent used is specifically 2-hydroxypyridine

[0052] The leveling agent is polyether modified silicone.

[0053] The substrate wetting agent is polyoxyethyl nonylphenol.

[0054] The solvent is butyl acetate.

[0055] The finished resins in Examples 1-4 and commercially available resins were prepared into easy-adhesive coatings according to the above method and then tested and compared:

[0056] Table 1. Coating formula test table

[0057]

[0058] In order to test the effect of the easy-adhesion coating of the present invention, several tests were carried out after coating as follows:

[0059] Use a coating preparation device to evenly coat the easy-adhesive coating on the PET film (film thickness 1 micron), the coating thickness is controlled to 2 microns, and then heat-cured. The curing condition is baking at 100 degrees for 60 seconds. After the curing is completed, the test is carried out:

[0060] 1. Brightness test: The test conditions are temperature: 25℃-60℃, humidity: 60℃-90℃, and the cycle is 48 hours.

[0061] Test results: The brightness variation on the thin film coating is less than 1%.

[0062] 2. Salt spray test: The test conditions are temperature: 25°, salt water concentration: 5% sodium chloride solution, and the cycle is 48 hours.

[0063] Test results: The oxidation discoloration area on the front side of the film coating is less than 10%.

[0064] 3. Alcohol resistance test: Use 95% alcohol cotton, 500 grams of strength, and test back and forth 50 times.

[0065] Test result: There is no shiny phenomenon on the surface after wiping with alcohol.

[0066] 4. Adhesion test: After damaging the coating surface with a grating knife, test with a 3M 610 label. Cover the entire label and tear off the 3M label at a 45-degree angle. Number of times: once.

[0067] Inspection result: There was no peeling of the coating.

[0068] Table 2. Comparison of test data of coatings configured in the embodiment and commercially available products

[0069] Silver plating adhesion Dryness Brightness Salt spray test (48hr) Solvent resistance A 5B Completely dry and non-sticky -0.2％ Oxidation 10% >80 times B 5B Completely dry and non-sticky -0.4％ Oxidation 12% >80 times C 5B Completely dry and non-sticky -0.8％ Oxidation 3% >150 times D 5B Completely dry and non-sticky -0.9％ Oxidation 3% >150 times E 2B Undried back glue -4.6％ Oxidation 80% 25 times F 2B Semi-dry, slightly sticky -2.5％ Oxidation 60% 30 times

[0070] From the test data, it can be compared that the formula resins of A, B, C, and D are better than the commercially available products. The main difference between A and B is the selection of refractive index monomers, and the main difference between C and D is the selection of grafted polyester. The same preparation method using different refractive index monomers will lead to changes in the brightness and salt spray resistance of the finished product.

[0071] From the comparative tests of A, B, C, and D, it can be found that when propylene glycol laurate is used to modify acrylic resin, its crosslinking density can be increased, and its salt spray corrosion resistance and heat resistance can be improved. However, its molecular weight after grafting is large and its solubility is poor, resulting in lower transparency after film formation than that of the resin modified with ethylene glycol laurate.

[0072] From the data in Table 2, it can be found that the coating made of easy-to-bond acrylic modified polyester resin is far superior to the coating made of conventional resin in terms of adhesion, drying, salt spray resistance and solvent resistance, which is enough to prove that the formulation process has technical priority.

[0073] Conventional acrylic resins and polyurethane resins on the market have a slow drying speed. The coating cannot be completely dried under fast drying conditions, which will cause difficulties in coating and winding, thereby reducing production capacity. In addition, because the coating has not been completely cured, its performance is insufficient, which seriously affects the subsequent processing and use of the coil.

[0074] The resin synthesis process adopts a segmented polymerization method to increase the refractive index of the resin, making the refractive index of the resin equivalent to that of the PET film, thereby reducing the brightness change of the finished film. In addition, the formulation process also adds polyester grafting modification to improve the adhesion to the substrate and resistance to salt spray. The overall performance is far superior to conventional products on the market.

[0075] After inspection and testing, the product's surface brightness, salt spray resistance and adhesion all meet the requirements. The product is qualified and has been greatly improved compared to products with existing technology.

[0076] The present invention is not limited to the above-mentioned embodiments. Any changes in shape or structure shall fall within the protection scope of the present invention. The protection scope of the present invention is defined by the attached claims. Those skilled in the art may make various changes, modifications, substitutions, combinations and simplifications to these embodiments without departing from the principle and essence of the present invention. All of these shall be equivalent replacement methods and fall within the protection scope of the present invention.

Claims

1. A modified acrylic polyester resin, characterized in that: The composition comprises the following components in parts by weight: The basic raw material of the modified acrylic polyester resin includes 50 to 60 parts by weight of acrylic resin and 5 to 15 parts by weight of linear saturated polyester resin; the linear saturated polyester resin is polyethylene glycol monolaurate or polypropylene glycol monolaurate; 50-60 parts by weight of the acrylic resin and 5-15 parts by weight of the linear saturated polyester resin are put into a reaction kettle, and the temperature is controlled between 80 and 90° C. After the linear saturated polyester resin is completely dissolved, a chain extender is added to carry out polymerization reaction, and the reaction is carried out for 5-6 hours; then, the reaction is sealed and pressurized to 2-3 standard atmospheric pressures, and the temperature is maintained to continue the reaction for 2-4 hours; then, normal pressure is restored, an organic solvent is added to dilute, and the temperature is slowly lowered to 40-30 degrees Celsius, and the cooling rate is controlled at 8-12 degrees / hour, and finally the modified acrylic polyester resin is obtained; The chain extender is selected from any one of 1,4-butanediol (BDO), 1,6-hexanediol, glycerol, trimethylolpropane, diethylene glycol (DEG), triethylene glycol, neopentyl glycol (NPG), sorbitol or diethylaminoethanol (DEAE) or a combination thereof; the organic solvent is selected from any one of butanone, acetone, toluene, ethyl acetate, xylene or a combination thereof.

2. The modified acrylic polyester resin according to claim 1, characterized in that The synthetic raw materials of the acrylic resin include the following components in parts by weight: 3-5 parts of acrylic acid; 8-10 parts of 2-hydroxyethyl methacrylate; 15-30 parts of butyl acrylate; 8-15 parts of methyl methacrylate; 8-15 parts of styrene; 11-13 parts of high refractive index monomer; 2-3 parts of dibenzoyl peroxide; 26-35 parts of propylene glycol methyl ether acetate; The high refractive index monomer is selected from any one of zirconium acrylate, hafnium carboxyethyl acrylate, bromonorbornane lactone triacrylate zirconium carboxylate, or polyethylene glycol o-phenylphenyl ether acrylate or a combination thereof.

3. The modified acrylic polyester resin according to claim 2, characterized in that: The preparation method of the acrylic resin is as follows: S1, placing the propylene glycol methyl ether acetate in a reaction vessel, stirring and heating to 90-92° C.; S2, acrylic acid, 2-hydroxyethyl methacrylate, butyl acrylate, methyl methacrylate, styrene, high refractive index monomer, dibenzoyl peroxide are mixed, and then added dropwise to the reaction container in step S1 for 6 to 8 hours, and stirred for reaction at a reaction temperature of 90 to 92°C; S3. After the dropwise addition is completed, stop heating and continue stirring for 2 to 4 hours. When the system temperature drops below 45 degrees, pour out the reaction solution to obtain acrylic resin.

4. A coating, characterized in that: The coating is prepared using the modified acrylic polyester resin as claimed in any one of claims 1 to 4 as a basic raw material.

5. The coating according to claim 4, characterized in that: The coating comprises the following components in parts by weight: 40-50 parts of the modified acrylic resin, 10-15 parts of a single-component curing agent, 0.5-1 part of a leveling agent, 0.5-1 part of a substrate wetting agent, and 40-50 parts of butyl acetate; The one-component curing agent is a blocked aliphatic polyisocyanate, and its deblocking temperature is 70° C.; the leveling agent is a polyether-modified silicone; and the substrate wetting agent is a nonylphenol polyoxyethyl compound.

6. The coating according to claim 5, characterized in that: The blocking agent used in the preparation of the blocked aliphatic polyisocyanate is selected from the group consisting of cresol, ethylphenol, n-propol, isopropol, n-butylphenol, sec-butylphenol, tert-butylphenol, n-hexylphenol, 2-ethylhexylphenol, n-octylphenol, n-nonylphenol, di-n-propol, di-isopropol, isopropylcresol, di-n-butylphenol, di-sec-butylphenol, di-tert-butylphenol, di-n-octylphenol, di-2-ethylhexylphenol, di-n-nonylphenol, nitrophenol, bromophenol, chlorophenol, fluorophenol, dimethylphenol, styrenated phenol, methyl salicylate, methyl 4-hydroxybenzoate, benzyl 4-hydroxybenzoate, 2-ethylhexyl hydroxybenzoate, 4-[(dimethylamino)methyl]phenol, 4-[(dimethylamino)methyl]nonylphenol, bis(4-hydroxyphenyl)acetic acid, 2-hydroxypyridine (dissociation temperature 80°C), 2- or 8-hydroxyquinoline, 2-chloro-3-pyridinol or pyridine-2-thiol.

7. Use of the coating according to any one of claims 4 to 6 in the preparation of an optical film, characterized in that: The coating is coated on the surface of the optical film as a protective layer.

8. The use according to claim 7, characterized in that: The optical film includes a silver reflective film.

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