Blue-light-proof peep-proof film and preparation process thereof

Abstract

The invention discloses an anti-blue-light peep-proof film and a preparation process thereof, and relates to the technical field of anti-blue-light peep-proof films, and the anti-blue-light peep-proof film comprises a base material layer and a functional layer compounded on the surface of the base material layer; the thickness of the base material layer is 80-100 microns, and the thickness of the functional layer is 100-120 microns; the base material layer is prepared from composite nylon resin containing a nickel phosphate polymer; the functional layer is prepared from a functionalized carboxymethyl cellulose solution containing a functional graphene sheet.

Description

Technical Field

[0001] The present invention relates to the technical field of blue light blocking and anti-peeping films, and specifically to a blue light blocking and anti-peeping film and its preparation process. Background Art

[0002] With the popularization and continuous enhancement of the functions of electronic communication devices, the security protection of personal information and business secrets has become an increasingly concerned focus. Electronic devices such as computers, mobile phones, and tablets are prone to the risk of information being peeked due to the large viewing angle of their screens. Especially in public places or office environments, the leakage problems of sensitive information, account passwords, and business secrets are becoming more prominent. Therefore, as an important means to effectively protect privacy, anti-peeping films have been widely used.

[0003] Traditional anti-peeping films are usually prepared based on super shutter optical technology. Its process includes forming a prism structure on the surface of the substrate by UV coating or hot pressing, and then filling black or gray components to achieve the limitation of the screen viewing angle. However, the problem of blue light radiation generally exists in modern electronic displays. Blue light not only causes harm to the eyes but also may accelerate the aging of retinal cells, thus causing visual fatigue and health hazards. Therefore, many anti-peeping films have added anti-blue light performance in function, and filter the screen blue light through electroplating technology or adding anti-blue light materials in the substrate. However, these traditional processes have obvious technical difficulties, including the reduction of imaging clarity and double image phenomenon caused by the refractive index mismatch between materials, and the problem that it is difficult to balance the anti-blue light performance and the anti-peeping effect.

[0004] Therefore, it is of great significance to develop a new type of anti-peeping film that can simultaneously have high anti-peeping performance and excellent anti-blue light function. Summary of the Invention

[0005] The purpose of the present invention is to provide a blue light blocking and anti-peeping film and its preparation process to solve the problems raised in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A blue light blocking and anti-peeping film includes a substrate layer and a functional layer compounded on the surface of the substrate layer; the thickness of the substrate layer is 80 - 100 μm, and the thickness of the functional layer is 100 - 120 μm; the substrate layer is prepared from a composite nylon resin containing nickel phosphate polymer; the functional layer is prepared from a functionalized carboxymethyl cellulose solution containing functional graphene flakes.

[0008] Further, the preparation method of the composite nylon resin includes the following steps:

[0009] Dissolve the alcohol-soluble nylon resin in absolute ethanol at 60 - 65°C, stir evenly to obtain a nylon solution; add the ethanol solution of nickel phosphate polymer to the nylon solution, heat to 60 - 65°C and stir for reaction for 12 - 13 h to obtain a composite nylon resin.

[0010] Furthermore, in the preparation process of the composite nylon resin, the mass ratio of nickel phosphate polymer to alcohol-soluble nylon resin is (10 - 20):(80 - 90); the concentration of the ethanol solution of nickel phosphate polymer is 20 - 25 mg / mL.

[0011] Furthermore, the preparation method of the nickel phosphate polymer includes the following steps:

[0012] Add nickel chloride hexahydrate to absolute ethanol, stir evenly, add triethylamine, stir evenly, add the ethanol solution of phosphoric acid, stir at room temperature for 12 - 14 h, centrifuge, remove the supernatant, collect the gel, wash to obtain the nickel phosphate polymer.

[0013] Furthermore, in the preparation process of the nickel phosphate polymer, the molar ratio of nickel chloride hexahydrate:triethylamine:phosphoric acid is 1:20:1.

[0014] Furthermore, the preparation method of the functionalized carboxymethyl cellulose solution includes the following steps:

[0015] Add filter paper to 1M sodium chloroacetate solution, heat to 50 - 55°C and stir for 2 - 2.5 h, filter, wash the fibers with deionized water, dry at 65 - 70°C to obtain carboxymethyl cellulose; add carboxymethyl cellulose and functional graphene flakes to 1-allyl-3-methylimidazolium chloride, stir evenly, dry in vacuum, heat to 100 - 102°C and stir for 5 - 6 h to obtain the functionalized carboxymethyl cellulose solution.

[0016] Furthermore, in the preparation process of the functionalized carboxymethyl cellulose solution, the mass ratio of carboxymethyl cellulose:function graphene flakes:1-allyl-3-methylimidazolium chloride is (0.4 - 0.5):(5 - 10):(19.5 - 19.6).

[0017] Furthermore, the preparation method of the functional graphene flakes includes the following steps:

[0018] Ultrasonically disperse the graphene oxide stock solution in deionized water, add the lutein solution, add 1M sodium hydroxide solution to adjust the pH to 9 - 10, heat to 95 - 96°C and stir for reaction for 3 - 4 h, filter, wash, dry to obtain the functional graphene flakes.

[0019] Furthermore, in the preparation process of the functional graphene flakes, 0.02 - 0.03 mg of lutein is added per 1 mg of graphene oxide.

[0020] A preparation process of a blue light blocking and anti-peeping film, comprising the following steps: S1: Coating a composite nylon resin on the surface of a glass plate and drying at 60-65 °C to obtain a substrate layer;

[0021] S2: Coating a functionalized carboxymethyl cellulose solution on the surface of the substrate layer, standing for 30-45 min, immersing in deionized water at room temperature for coagulation, and washing to obtain a functional layer;

[0022] S3: Adding lutein into absolute ethanol, stirring evenly, immersing the material prepared in step S2 therein, soaking at 20-25 °C for 2-3 h, washing, and drying at room temperature to obtain a blue light blocking and anti-peeping film;

[0023] During the preparation of the blue light blocking and anti-peeping film, 1 mL of absolute ethanol is added for every 10-20 mg of lutein;

[0024] The preparation processes of step S2 and step S3 are placed in a magnetic field environment throughout, the magnetic field direction is perpendicular to the substrate layer, so that the functional graphene flakes in the functionalized carboxymethyl cellulose solution are distributed parallel to the magnetic field direction.

[0025] The magnetic induction intensity of the magnetic field environment is 1 T-3 T.

[0026] The thickness of the graphene oxide is 10-20 nm, and the radial length is 70-90 μm.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. The present invention prepares a nylon / nickel phosphate polymer nanocomposite by a hydrogen bond crosslinking method. By using the -PO 4 3- terminal group of the nickel phosphate polymer to form hydrogen bonds with the -NH groups on the nylon molecular chain, the problem that the incompatibility between the inorganic metal salt and the polymer interface often leads to agglomeration and phase separation is solved, the compatibility is greatly improved, and it is uniformly dispersed in the nanoscale in the prepared composite nylon resin, forming an invisible phase interface at the nano-micro scale. At the same time, due to the weak interface between the nickel phosphate polymer and nylon, it can not only ensure the inorganic strength enhancement effect, but also ensure that nylon has good toughness under high load. Using it as the substrate layer combined with the functional layer, in terms of mechanical properties, the substrate layer is responsible for providing excellent toughness, elongation and impact resistance for the blue light blocking and anti-peeping film, and the functional layer is responsible for providing excellent tensile strength for the blue light blocking and anti-peeping film, endowing the blue light blocking and anti-peeping film with excellent mechanical properties. In terms of blue light blocking performance, due to the true nano-dispersion of the nickel phosphate polymer in nylon without obvious agglomeration, excellent blue light blocking performance is given to the substrate layer on the premise of retaining a high light transmittance.

[0029] 2. On the basis of the substrate layer technology, the present invention further incorporates the natural bioactive ingredient lutein into the cellulose matrix through a green and simple adsorption strategy, and controls the arrangement of lutein-modified graphene films in the cellulose matrix aromatically by means of a magnetic field to prepare a functional layer with anti-peeping performance. The lutein in the functional layer further enhances the blue light shielding performance of the film, and the loading of lutein by the cellulose matrix can improve the photostability of lutein, greatly extending the service life of the film as a blue light shielding material. At the same time, the cellulose film can still maintain high visible light transparency and low haze, and finally a blue light blocking and anti-peeping film with excellent mechanical properties, light transmission properties and blue light shielding properties is prepared. Detailed implementation mode

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] In the following examples, the filter paper is a round quantitative cotton fiber filter paper; the alcohol-soluble nylon resin model is ES-1; the rest of the raw materials are commercially available.

[0032] Example 1: A preparation process of a blue light blocking and anti-peeping film, comprising the following steps: S1: Add 1 mol of nickel chloride hexahydrate to 1.5 L of absolute ethanol, stir evenly, add 20 mol of triethylamine, stir evenly, add a 100 mL ethanol solution containing 1 mol of phosphoric acid, stir at room temperature for 12 h, centrifuge, remove the supernatant, collect the gel, wash, and obtain nickel phosphate polymer;

[0033] S2: Add 9 g of alcohol-soluble nylon resin to 50 mL of absolute ethanol at 60 °C, stir evenly to obtain a nylon solution; add an ethanol solution containing 1 g of nickel phosphate polymer to the nylon solution, heat to 60 °C and stir for 12 h to obtain a composite nylon resin;

[0034] S3: Ultrasonically disperse 1 mg of graphene oxide stock solution in deionized water, add a lutein solution containing 0.02 mg, add 1 M sodium hydroxide solution to adjust the pH to 9, heat to 95 °C and stir for 3 h, filter, wash, and dry to obtain functional graphene flakes;

[0035] S4: Add 40 g of filter paper into 1 L of 1 M sodium chloroacetate solution, heat to 50 °C and stir for 2 h, filter, wash the fibers with deionized water, and dry at 65 °C to obtain carboxymethyl cellulose; add 0.5 g of carboxymethyl cellulose and 5 g of functional graphene flakes into 19.5 g of 1-allyl-3-methylimidazolium chloride, stir evenly, dry under vacuum, heat to 100 °C and stir for 5 h to obtain a functionalized carboxymethyl cellulose solution;

[0036] S5: Coat the composite nylon resin on the surface of the glass plate and dry at 60 °C to obtain a substrate layer;

[0037] S6: Coat the functionalized carboxymethyl cellulose solution on the surface of the substrate layer, let it stand for 30 min, immerse it in deionized water at room temperature to solidify, wash it to obtain a functional layer;

[0038] S7: Add 2000 mg of lutein into 100 mL of absolute ethanol, stir evenly, immerse the material prepared in step S2 into it, soak at 20 °C for 2 h, wash it, and dry at room temperature to obtain a blue light blocking and privacy protection film.

[0039] The thickness of the substrate layer is 100 μm and the thickness of the functional layer is 100 μm.

[0040] Example 2: A preparation process of a blue light blocking and privacy protection film, comprising the following steps: S1: Add 1 mol of nickel chloride hexahydrate into 1.5 L of absolute ethanol, stir evenly, add 20 mol of triethylamine, stir evenly, add 100 mL of ethanol solution containing 1 mol of phosphoric acid, stir at room temperature for 12 h, centrifuge, remove the supernatant, collect the gel, wash it to obtain nickel phosphate polymer;

[0041] S2: Add 8.5 g of alcohol-soluble nylon resin into 50 mL of absolute ethanol at 60 °C, stir evenly to obtain a nylon solution; add the ethanol solution containing 1.5 g of nickel phosphate polymer into the nylon solution, heat to 60 °C and stir for 12 h to obtain a composite nylon resin;

[0042] S3: Ultrasonically disperse 1 mg of graphene oxide stock solution in deionized water, add a lutein solution containing 0.02 mg, add 1 M sodium hydroxide solution to adjust the pH to 9, heat to 95 °C and stir for 3 h, filter, wash, and dry to obtain functional graphene flakes;

[0043] S4: Add 40 g of filter paper into 1 L of 1 M sodium chloroacetate solution, heat to 50 °C and stir for 2 h, filter, wash the fibers with deionized water, and dry at 65 °C to obtain carboxymethyl cellulose; add 0.5 g of carboxymethyl cellulose and 5 g of functional graphene flakes into 19.5 g of 1-allyl-3-methylimidazolium chloride, stir evenly, dry under vacuum, heat to 100 °C and stir for 5 h to obtain a functionalized carboxymethyl cellulose solution;

[0044] S5: Coat the surface of the glass plate with composite nylon resin and dry at 60 °C to obtain a substrate layer;

[0045] S6: Coat the surface of the substrate layer with the functionalized carboxymethyl cellulose solution, let it stand for 30 min, immerse it in deionized water at room temperature for solidification, and wash to obtain a functional layer;

[0046] S7: Add 2000 mg of lutein to 100 mL of absolute ethanol, stir evenly, immerse the material prepared in step S2 therein, soak at 20 °C for 2 h, wash, and dry at room temperature to obtain a blue light blocking and privacy protection film.

[0047] The thickness of the substrate layer is 100 μm, and the thickness of the functional layer is 100 μm.

[0048] Example 3: A preparation process of a blue light blocking and privacy protection film, comprising the following steps: S1: Add 1 mol of nickel chloride hexahydrate to 1.5 L of absolute ethanol, stir evenly, add 20 mol of triethylamine, stir evenly, add 100 mL of ethanol solution containing 1 mol of phosphoric acid, stir at room temperature for 12 h, centrifuge, remove the supernatant, collect the gel, wash to obtain nickel phosphate polymer;

[0049] S2: Add 8 g of alcohol-soluble nylon resin to 50 mL of absolute ethanol at 60 °C, stir evenly to obtain a nylon solution; add the ethanol solution containing 2 g of nickel phosphate polymer to the nylon solution, heat to 60 °C and stir for reaction for 12 h to obtain a composite nylon resin;

[0050] S3: Ultrasonically disperse 1 mg of graphene oxide stock solution in deionized water, add a lutein solution containing 0.02 mg, add 1 M sodium hydroxide solution to adjust the pH to 9, heat to 95 °C and stir for reaction for 3 h, filter, wash, and dry to obtain functional graphene flakes;

[0051] S4: Add 40 g of filter paper to 1 L of 1 M sodium chloroacetate solution, heat to 50 °C and stir for 2 h, filter, wash the fibers with deionized water, and dry at 65 °C to obtain carboxymethyl cellulose; add 0.5 g of carboxymethyl cellulose and 5 g of functional graphene flakes to 19.5 g of 1-allyl-3-methylimidazolium chloride, stir evenly, dry under vacuum, heat to 100 °C and stir for 5 h to obtain a functionalized carboxymethyl cellulose solution;

[0052] S5: Coat the surface of the glass plate with the composite nylon resin and dry at 60 °C to obtain a substrate layer;

[0053] S6: Coat the surface of the substrate layer with the functionalized carboxymethyl cellulose solution, let it stand for 30 min, immerse it in deionized water at room temperature for solidification, and wash to obtain a functional layer;

[0054] S7: Add 2000 mg of lutein into 100 mL of absolute ethanol, stir evenly, immerse the material prepared in step S2 therein, soak at 20 °C for 2 h, wash, and dry at room temperature to obtain the blue light blocking and privacy protection film.

[0055] The thickness of the substrate layer is 100 μm, and the thickness of the functional layer is 100 μm.

[0056] Example 4: A preparation process of a blue light blocking and privacy protection film, comprising the following steps: S1: Add 1 mol of nickel chloride hexahydrate into 1.5 L of absolute ethanol, stir evenly, add 20 mol of triethylamine, stir evenly, add 100 mL of ethanol solution containing 1 mol of phosphoric acid, stir at room temperature for 12 h, centrifuge, remove the supernatant, collect the gel, wash to obtain nickel phosphate polymer;

[0057] S2: Add 9 g of alcohol-soluble nylon resin into 50 mL of absolute ethanol at 60 °C, stir evenly to obtain a nylon solution; add the ethanol solution containing 1 g of nickel phosphate polymer into the nylon solution, heat to 60 °C and stir for reaction for 12 h to obtain a composite nylon resin;

[0058] S3: Ultrasonically disperse 1 mg of graphene oxide stock solution in deionized water, add a lutein solution containing 0.02 mg, add 1 M sodium hydroxide solution to adjust the pH to 9, heat to 95 °C and stir for reaction for 3 h, filter, wash, and dry to obtain functional graphene flakes;

[0059] S4: Add 40 g of filter paper into 1 L of 1 M sodium chloroacetate solution, heat to 50 °C and stir for 2 h, filter, wash the fibers with deionized water, and dry at 65 °C to obtain carboxymethyl cellulose; add 0.5 g of carboxymethyl cellulose and 10 g of functional graphene flakes into 19.5 g of 1-allyl-3-methylimidazolium chloride, stir evenly, dry under vacuum, heat to 100 °C and stir for 5 h to obtain a functionalized carboxymethyl cellulose solution;

[0060] S5: Coat the composite nylon resin on the surface of a glass plate, and dry at 60 °C to obtain the substrate layer;

[0061] S6: Coat the functionalized carboxymethyl cellulose solution on the surface of the substrate layer, let it stand for 30 min, immerse it in deionized water at room temperature for coagulation, and wash to obtain the functional layer;

[0062] S7: Add 2000 mg of lutein into 100 mL of absolute ethanol, stir evenly, immerse the material prepared in step S2 therein, soak at 20 °C for 2 h, wash, and dry at room temperature to obtain the blue light blocking and privacy protection film.

[0063] The thickness of the substrate layer is 100 μm, and the thickness of the functional layer is 100 μm.

[0064] Comparative Example 1: A preparation process of a blue light blocking and anti-peeping film, comprising the following steps: S1: Add 0.4 g of cetyltrimethylammonium bromide to 1.5 L of deionized water, stir evenly, add an aqueous solution of potassium dihydrogen phosphate trihydrate, stir evenly, add 1 M sodium hydroxide solution to adjust the pH to 9, add an aqueous solution of nickel chloride hexahydrate, stir for 24 h, filter, wash the precipitate with deionized water, vacuum dry at 50 °C for 24 h, and grind to obtain nickel phosphate nanoparticles;

[0065] S2: Add 9 g of alcohol-soluble nylon resin to 50 mL of anhydrous ethanol at 60 °C, stir evenly to obtain a nylon solution; add an ethanol solution containing 1 g of nickel phosphate nanoparticles to the nylon solution, heat to 60 °C and stir for 12 h to obtain a composite nylon resin;

[0066] S3: Ultrasonically disperse 1 mg of graphene oxide stock solution in deionized water, add a lutein solution containing 0.02 mg, add 1 M sodium hydroxide solution to adjust the pH to 9, heat to 95 °C and stir for 3 h, filter, wash, and dry to obtain functional graphene flakes;

[0067] S4: Add 40 g of filter paper to 1 L of 1 M sodium chloroacetate solution, heat to 50 °C and stir for 2 h, filter, wash the fibers with deionized water, and dry at 65 °C to obtain carboxymethyl cellulose; add 0.5 g of carboxymethyl cellulose and 5 g of functional graphene flakes to 19.5 g of 1-allyl-3-methylimidazolium chloride, stir evenly, vacuum dry, heat to 100 °C and stir for 5 h to obtain a functionalized carboxymethyl cellulose solution;

[0068] S5: Coat the composite nylon resin on the surface of a glass plate and dry at 60 °C to obtain a substrate layer;

[0069] S6: Coat the functionalized carboxymethyl cellulose solution on the surface of the substrate layer, let it stand for 30 min, immerse it in deionized water at room temperature to solidify, and wash to obtain a functional layer;

[0070] S7: Add 2000 mg of lutein to 100 mL of anhydrous ethanol, stir evenly, immerse the material prepared in step S2 in it, soak at 20 °C for 2 h, wash, and dry at room temperature to obtain a blue light blocking and anti-peeping film.

[0071] The thickness of the substrate layer is 100 μm and the thickness of the functional layer is 100 μm.

[0072] Comparative Example 2: A preparation process of a blue light blocking and anti-peeping film, comprising the following steps: S2: Add 9.5 g of alcohol-soluble nylon resin to 50 mL of anhydrous ethanol at 60 °C, stir evenly to obtain a nylon solution; add an ethanol solution containing 0.5 g of nickel phosphate polymer to the nylon solution, heat to 60 °C and stir for 12 h to obtain a composite nylon resin;

[0073] The remaining steps are the same as those in Example 1.

[0074] Comparative Example 3: A preparation process of a blue light blocking and anti-peeping film, including the following steps: S2: Add 7 g of alcohol-soluble nylon resin to 50 mL of anhydrous ethanol at 60 °C, stir evenly to obtain a nylon solution; add an ethanol solution containing 3 g of nickel phosphate polymer to the nylon solution, heat to 60 °C and stir for 12 h to obtain a composite nylon resin;

[0075] The remaining steps are the same as those in Example 1.

[0076] Comparative Example 4: A preparation process of a blue light blocking and anti-peeping film, including the following steps: S4: Add 40 g of filter paper to 1 L of 1 M sodium chloroacetate solution, heat to 50 °C and stir for 2 h, filter, wash the fibers with deionized water, and dry at 65 °C to obtain carboxymethyl cellulose; add 0.5 g of carboxymethyl cellulose and 1 g of functional graphene flakes to 19.5 g of 1-allyl-3-methylimidazolium chloride, stir evenly, dry under vacuum, heat to 100 °C and stir for 5 h to obtain a functionalized carboxymethyl cellulose solution;

[0077] The remaining steps are the same as those in Example 1.

[0078] Comparative Example 5: A preparation process of a blue light blocking and anti-peeping film, including the following steps: S4: Add 40 g of filter paper to 1 L of 1 M sodium chloroacetate solution, heat to 50 °C and stir for 2 h, filter, wash the fibers with deionized water, and dry at 65 °C to obtain carboxymethyl cellulose; add 0.5 g of carboxymethyl cellulose and 14 g of functional graphene flakes to 19.5 g of 1-allyl-3-methylimidazolium chloride, stir evenly, dry under vacuum, heat to 100 °C and stir for 5 h to obtain a functionalized carboxymethyl cellulose solution;

[0079] The remaining steps are the same as those in Example 1.

[0080] Experiment: Blue light blocking performance test: Use an ultraviolet-visible absorption spectrophotometer to measure the blue light absorption. The wavelength range is 370 - 480 nm. Take the wavelength with the highest blue light absorption rate within the wavelength range as the reference blue light absorption rate, and compare the blue light absorption rates at the same wavelength.

[0081] Anti-peeping light transmittance performance test: Test the blue light blocking and anti-peeping films prepared in the above examples and comparative examples according to ASTM D 1003-07, and take the light transmittance perpendicular to the blue light blocking and anti-peeping film at 90° as the reference light transmittance for comparison.

[0082] Mechanical property test: Use a universal testing machine for testing. The tensile rate is 80 μm / s (cut the film sample into dumbbell-shaped specimens with a width of 10 mm, a length of 27 mm, a tensile zone width of 5 mm, and a length of 10 mm), and measure three times and take the average value.

[0083] The experimental data are shown in Table 1 below.

[0084]

[0085] Table 1 Data Sheet of Experimental Performance Test of Blue Light Blocking and Privacy Screen Film

[0086] Conclusion: The blue light blocking and privacy screen film prepared by the present invention has excellent blue light blocking, privacy protection, light transmittance, and mechanical properties.

[0087] In Comparative Example 1, nickel phosphate nanoparticles were prepared to replace nickel phosphate polymer, resulting in reduced dispersion performance in the nylon matrix, easy agglomeration, and reduced performance of various properties.

[0088] In Comparative Example 2, the addition amount of nickel phosphate polymer was reduced, resulting in reduced performance of various properties of the blue light blocking and privacy screen film.

[0089] In Comparative Example 3, the addition amount of nickel phosphate polymer was too much, resulting in reduced dispersion performance in the nylon matrix and a significant reduction in light transmittance.

[0090] In Comparative Example 4, the addition amount of functional graphene flakes was reduced, resulting in reduced performance of various properties of the blue light blocking and privacy screen film.

[0091] In Comparative Example 5, the addition amount of functional graphene flakes was too much, resulting in reduced performance of various properties of the blue light blocking and privacy screen film.

[0092] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

Claims

1. A blue light protection film, characterized in that: It comprises a substrate layer and a functional layer composited on the surface of the substrate layer; the thickness of the substrate layer is 80-100 μm, and the thickness of the functional layer is 100-120 μm; the substrate layer is prepared from a composite nylon resin containing a nickel phosphate polymer; and the functional layer is prepared from a functionalized carboxymethyl cellulose solution containing functional graphene flakes.

2. The anti-blue light privacy film according to claim 1, characterized in that: The preparation method of the composite nylon resin comprises the following steps: The alcohol-soluble nylon resin is added to anhydrous ethanol at 60-65° C. and stirred evenly to obtain a nylon solution; the ethanol solution of the nickel phosphate polymer is added to the nylon solution, heated to 60-65° C. and stirred for reaction for 12-13 hours to obtain a composite nylon resin.

3. The anti-blue light privacy film according to claim 2, characterized in that: In the preparation process of the composite nylon resin, the mass ratio of the nickel phosphate polymer to the alcohol-soluble nylon resin is (10-20):(80-90); the concentration of the ethanol solution of the nickel phosphate polymer is 20-25 mg / mL.

4. The anti-blue light privacy film according to claim 2, characterized in that: The method for preparing the nickel phosphate polymer comprises the following steps: Add nickel chloride hexahydrate to anhydrous ethanol, stir evenly, add triethylamine, stir evenly, add phosphoric acid ethanol solution, stir at room temperature for 12-14 hours, centrifuge, remove the supernatant, collect the gel, wash, and obtain nickel phosphate polymer.

5. The anti-blue light privacy film according to claim 4, characterized in that: The molar ratio of nickel chloride hexahydrate: triethylamine: phosphoric acid in the preparation process of nickel phosphate polymer is 1:20:

1.

6. The anti-blue light privacy film according to claim 1, characterized in that: The method for preparing the functionalized carboxymethyl cellulose solution comprises the following steps: Add filter paper to 1M sodium chloroacetate solution, heat to 50-55°C and stir for 2-2.5h, filter, wash the fiber with deionized water, dry at 65-70°C to obtain carboxymethyl cellulose; add carboxymethyl cellulose and functional graphene sheets to 1-allyl-3-methylimidazole chloride, stir evenly, vacuum dry, heat to 100-102°C and stir for 5-6h to obtain a functionalized carboxymethyl cellulose solution.

7. The anti-blue light privacy film according to claim 6, characterized in that: In the preparation process of the functionalized carboxymethyl cellulose solution, the mass ratio of carboxymethyl cellulose: functional graphene flakes: 1-allyl-3-methylimidazolium chloride is (0.4-0.5):(5-10):(19.5-19.6).

8. The anti-blue light privacy film according to claim 6, characterized in that: The method for preparing the functional graphene sheet comprises the following steps: The graphene oxide stock solution was ultrasonically dispersed in deionized water, lutein solution was added, 1M sodium hydroxide solution was added to adjust the pH to 9-10, heated to 95-96° C. and stirred for reaction for 3-4 hours, filtered, washed, and dried to obtain functional graphene flakes.

9. The anti-blue light privacy film according to claim 8, characterized in that: During the preparation of functional graphene flakes, 0.02-0.03 mg of lutein was added per 1 mg of graphene oxide.

10. A process for preparing a blue light protection and privacy film according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: coating the composite nylon resin on the surface of the glass plate and drying at 60-65° C. to obtain a substrate layer; S2: coating the functionalized carboxymethyl cellulose solution on the surface of the substrate layer, allowing it to stand for 30-45 minutes, immersing it in deionized water at room temperature to solidify, and washing it to obtain a functional layer; S3: adding lutein to anhydrous ethanol, stirring evenly, immersing the material prepared in step S2 therein, soaking at 20-25° C. for 2-3 hours, washing, and drying at room temperature to obtain a blue light protection and privacy film; During the preparation of the blue light protection film, 1 mL of anhydrous ethanol was added for every 10-20 mg of lutein; The preparation process of step S2 and step S3 is placed in a magnetic field environment, the direction of the magnetic field is perpendicular to the substrate layer, so that the functional graphene flakes in the functionalized carboxymethyl cellulose solution are distributed parallel to the direction of the magnetic field.

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