Sun-resistant and blue-light-resistant composite material as well as preparation method and application thereof

Abstract

The invention discloses a sunscreen and blue-light-resistant composite material as well as a preparation method and application of the sunscreen and blue-light-resistant composite material. The sunscreen and blue light-resistant composite material takes boron nitride as a carrier, the surface of the boron nitride is coated with a sunscreen material layer and a blue light absorbent layer, and the surface of the sunscreen material layer is coated with a silane coupling agent layer. The specific preparation method comprises the following steps: by taking boron nitride as a carrier, firstly carrying out acid treatment, then washing to be neutral, then drying, respectively dispersing the nano sunscreen material and the blue light absorbent by using a solvent, sequentially adding into boron nitride to enable the nano sunscreen material and the blue light absorbent to be adsorbed on the surface of boron nitride, and then adding a coupling agent to carry out chemical grafting, so as to obtain the blue light-resistant nano sunscreen material. According to the preparation method, the nano sunscreen material and the blue light absorbent are firmly attached to the surface of the boron nitride in a drying manner, so that the obtained boron nitride not only has a relatively good ultraviolet-proof effect, but also has a relatively strong blue light-proof effect, and the preparation method is simple in process and suitable for batch production.

Description

Technical Field

[0001] The present invention relates to the technical field of material preparation, and in particular to a composite material with sun protection and anti-blue light functions, its preparation method and application. Background Art

[0002] Traditionally, sun protection mainly targets ultraviolet rays (UVB 280 - 315nm, UVA 315 - 400nm). The blue light band is in the range of 400 - 500nm. The penetration ability of blue light is stronger than that of ultraviolet rays, and it can reach the dermis layer directly, accelerating skin aging by activating mitochondria to produce reactive oxygen species (ROS), inducing melanin production and other pathways.

[0003] Boron nitride has a hexagonal layered structure and an extremely low coefficient of friction, and has a wide range of applications in many fields such as coatings, semiconductor and electronics industries, plastics, cosmetics, etc. In the cosmetics field, it is often used to optimize skin feel and smoothness, optical modification, etc. However, since it has no sun protection effect, it often needs to be used in combination with nanomaterials in sun protection cosmetics. Nanomaterials can effectively defend against ultraviolet radiation, but are weak in defending against blue light and need further research and improvement. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a composite material with sun protection and anti-blue light functions, its preparation method and application.

[0005] The first object of the present invention is to provide a composite material with sun protection and anti-blue light functions, using boron nitride as a carrier, and a sun protection material layer and a blue light absorber layer are wrapped on the surface of the boron nitride, and a silane coupling agent layer is wrapped on the surface of the sun protection material layer.

[0006] In some embodiments of the present invention, the particle size of the boron nitride is 1 micron to 100 microns, preferably 1 micron to 60 microns, and more preferably 1 micron to 30 microns. The larger the particle size of boron nitride, the more nano-sun protection materials and blue light absorbers can be adsorbed on its surface. Theoretically, the SPF value and blue light absorption rate will be higher. However, the larger the particle size of boron nitride, the smaller its specific surface area, the lower the proportion of surface atoms, the fewer active sites, and it will be more difficult to process. And during use, the dispersibility will be worse, resulting in serious agglomeration, which will reduce its sun protection and anti-blue light effects. Therefore, it is necessary to reasonably control the particle size.

[0007] In some embodiments of the present invention, the sun protection material is one or more of nano-titanium dioxide, nano-zinc oxide, and nano-cerium oxide, preferably nano-titanium dioxide and nano-zinc oxide.

[0008] In some embodiments of the present invention, the content of the sunscreen material accounts for 0.1-30 wt% of the mass of the boron nitride, preferably 1-30 wt%, and more preferably 1-20 wt%. The more the amount of nanomaterials, the higher the SPF value and the blue light absorption rate will be. However, due to the surface area of ​​the flaky boron nitride, when the amount of sunscreen material reaches a certain point, it will be a maximum point. If it is excessive, it will cause waste and increase costs.

[0009] In some embodiments of the present invention, the blue light absorber is one or more of alfalfa (purple alfalfa extract), rutin, anthocyanin (blueberry extract), and cassia seed extract, preferably alfalfa (purple alfalfa extract) and anthocyanin (blueberry extract).

[0010] In some embodiments of the present invention, the mass ratio of the blue light absorber to the solvent is (1:1) to (1:20); preferably 1:1 to 1:10, and more preferably 1:1 to 1:5.

[0011] The amount of the blue light absorber is 0.1% to 10Wt% of the composite material, preferably 0.5% to 8Wt%, and more preferably 0.5% to 5Wt%. The blue light absorber can effectively defend against blue light. Theoretically, the more blue light absorbers there are, the stronger the ability to defend against blue light will be. However, the surface of boron nitride is limited, and the amount of blue light absorbers it can accommodate is limited. Too much will lead to increased costs but the effect will not be obvious.

[0012] In some embodiments of the present invention, the silane coupling agent in the silane coupling agent layer is selected from one or more of methyltrimethoxysilane, methyltriethoxysilane, polymethyltriethoxysilane, propyltrimethoxysilane, propyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, octyltrimethoxysilane, octyltriethoxysilane, preferably methyltrimethoxysilane, propyltrimethoxysilane, octyltrimethoxysilane, more preferably propyltrimethoxysilane;

[0013] The dosage of the silane coupling agent is 0.1-10 wt% of the boron nitride. Preferably, it is 1-10 Wt%, and more preferably 1-5 Wt%. The coupling agent can increase the grafting rate of chemical bonds (the coupling agent in the present invention serves as a chemical connecting chain here and can form an O-Si-O bond with the hydroxyl -OH on the nano sunscreen material and the hydroxyl -OH on the surface of boron nitride, and can also form an O-Si-O bond with the hydroxyl -OH on the blue light absorber and the hydroxyl -OH on the surface of boron nitride, thereby firmly adsorbing the nano sunscreen material and the blue light absorber on the surface of boron nitride). The higher the grafting rate, the better the adsorption effect, and the higher the SPF value and the blue light absorption rate. However, the amount of chemical bonds of each boron nitride is limited. When the dosage of the coupling agent reaches a certain level, the chemical bond grafting rate will reach the maximum, and further increase will cause overflow, which may instead affect the SPF value and the blue light absorption rate).

[0014] The second object of the present invention is to provide a method for preparing the sunscreen and blue light resistant composite material, comprising the following steps:

[0015] Provide a kind of boron nitride, denoted as powder A;

[0016] Wet and disperse powder A in deionized water, and then adjust the pH of the solution to 1-4 with an acidic regulator to obtain slurry B;

[0017] Wash slurry B by dehydration until it is neutral, and then dry it to obtain powder C;

[0018] Mix the sunscreen material with a solvent and ultrasonically disperse it to obtain suspension D;

[0019] Spray suspension D into powder C and adsorb completely to obtain powder E;

[0020] Mix the blue light absorber with a solvent, stir and disperse it to obtain mixture F;

[0021] Spray mixture F into powder E and adsorb completely to obtain powder G;

[0022] Then spray the silane coupling agent into powder G, stir and disperse it to obtain powder H, heat and dry it to obtain the sunscreen and blue light resistant boron nitride.

[0023] In some embodiments of the present invention, the acidic regulator is one or more of hydrochloric acid, sulfuric acid, nitric acid, and phosphoric acid. Preferably, it is hydrochloric acid and sulfuric acid, and more preferably hydrochloric acid.

[0024] In some embodiments of the present invention, the solvent is selected from one or more of ethanol, isopropanol, water, and ethylene glycol. Preferably, it is ethanol and water, and more preferably ethanol.

[0025] In some embodiments of the present invention, the mass ratio of the sunscreen material to the solvent is 1:1 to 1:20; preferably 1:1 to 1:10, more preferably 1:1 to 1:5. The amount of the solvent needs to be appropriate. The more the solvent, the more uniformly the sunscreen materials, such as nano titanium dioxide or zinc oxide, can be dispersed, which can increase the effective adsorption rate. However, the solvent content cannot be too high, as too much will cause boron nitride to be overly wet and agglomerate, which is not conducive to the adsorption of the nanomaterials.

[0026] The temperature of the heat drying is 30°C to 100°C, preferably 30°C to 80°C, more preferably 60°C, and the time is 1 to 10 h, preferably 2 to 8 h, more preferably 2 to 5 h.

[0027] In some embodiments of the present invention, the spraying method of spraying suspension D into powder C, spraying the blue light absorber into mixture F, or spraying the silane coupling agent into powder G is carried out by spraying. Here, the spraying method is used to better make the nano sunscreen material and the blue light absorber more uniformly distributed on the surface of boron nitride.

[0028] The third object of the present invention is to provide a sunscreen cosmetic, including the composite material for sunscreen and anti-blue light.

[0029] Further, the sunscreen cosmetic includes sunscreen cream, sunscreen lotion, sunscreen liquid foundation, sunscreen cushion, sunscreen loose powder, sunscreen powder cake, and sunscreen lip balm.

[0030] The above technical solutions of the present invention have the following beneficial effects compared with the prior art:

[0031] In the present invention, boron nitride is used as a carrier. First, it is acid-treated. The acid treatment can break the B-N bonds on the surface of boron nitride. The broken B-bonds can combine with the -OH bonds in water to form B-OH bonds, thereby achieving the purpose of introducing hydroxyl groups. Then it is washed with water until neutral and dried. The nano sunscreen material and the blue light absorber are respectively dispersed with a solvent and then added to boron nitride successively, so that the nano sunscreen material and the blue light absorber are both adsorbed on the surface of boron nitride. Then a coupling agent is added for chemical grafting to form O-Si-O bonds between the nano sunscreen material and the blue light absorber and boron nitride respectively. Finally, through the drying method, the nano sunscreen material and the blue light absorber can be firmly attached to the surface of boron nitride. The obtained boron nitride not only has good ultraviolet protection effect, but also has strong anti-blue light effect, and the process is simple and suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to the specific embodiments of the present invention and in combination with the drawings, wherein

[0033] Figure 1It is the SEM micrograph of Embodiment 10 of the present invention. Detailed Embodiment

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments cited do not limit the present invention.

[0035] Embodiment 1

[0036] S1. Wet and disperse 100 g of boron nitride with a particle size of 1 micron in 300 g of deionized water, and then adjust the pH of the solution to 3 with hydrochloric acid to obtain slurry B;

[0037] S2. Dehydrate and wash slurry B until the pH is 6.5, and then dry it to obtain powder C;

[0038] S3. Mix 1 g of nano-titanium dioxide with 1 g of ethanol and ultrasonically disperse to obtain suspension D;

[0039] S4. Spray suspension D into powder C and adsorb completely to obtain powder E;

[0040] S5. Mix 0.5 g of Medicago sativa L. (alfalfa extract) with 0.5 g of ethanol, stir and disperse to obtain mixture F;

[0041] S6. Spray mixture F into powder E and adsorb completely to obtain powder G;

[0042] S7. Spray 1 g of propyltrimethoxysilane into powder G, stir and disperse to obtain powder H, and stir, heat and dry at 60 °C to obtain the sunscreen and anti-blue light composite material.

[0043] Embodiment 2

[0044] S1. Wet and disperse 100 g of boron nitride with a particle size of 10 microns in 300 g of deionized water, and then adjust the pH of the solution to 3 with hydrochloric acid to obtain slurry B;

[0045] S2. Dehydrate and wash slurry B until the pH is 6.5, and then dry it to obtain powder C;

[0046] S3. Mix 1 g of nano-titanium dioxide with 1 g of ethanol and ultrasonically disperse to obtain suspension D;

[0047] S4. Spray suspension D into powder C and adsorb completely to obtain powder E;

[0048] S5. Mix 0.5 g of Medicago sativa L. (alfalfa extract) with 0.5 g of ethanol, stir and disperse to obtain mixture F;

[0049] S6. Spray mixture F into powder E and adsorb completely to obtain powder G;

[0050] S7. Spray 1 g of propyltrimethoxysilane into powder G, stir and disperse to obtain powder H, and stir, heat and dry at 60 °C to obtain the sun protection and blue light resistant composite material.

[0051] Example 3

[0052] S1. Wet and disperse 100 g of boron nitride with a particle size of 30 microns in 300 g of deionized water, and then adjust the pH of the solution to 3 with hydrochloric acid to obtain slurry B;

[0053] S2. Dehydrate and wash slurry B until the pH is 6.5, and then dry to obtain powder C;

[0054] S3. Mix 1 g of nano-titanium dioxide with 1 g of ethanol and ultrasonically disperse to obtain suspension D;

[0055] S4. Spray suspension D into powder C and adsorb completely to obtain powder E;

[0056] S5. Mix 0.5 g of Medicago sativa extract (alfalfa extract) with 0.5 g of ethanol, stir and disperse to obtain mixture F;

[0057] S6. Spray mixture F into powder E and adsorb completely to obtain powder G;

[0058] S7. Spray 1 g of propyltrimethoxysilane into powder G, stir and disperse to obtain powder H, and stir, heat and dry at 60 °C to obtain the sun protection and blue light resistant composite material.

[0059] Example 4

[0060] S1. Wet and disperse 100 g of boron nitride with a particle size of 10 microns in 300 g of deionized water, and then adjust the pH of the solution to 3 with hydrochloric acid to obtain slurry B;

[0061] S2. Dehydrate and wash slurry B until the pH is 6.5, and then dry to obtain powder C;

[0062] S3. Mix 10 g of nano-titanium dioxide with 10 g of ethanol and ultrasonically disperse to obtain suspension D;

[0063] S4. Spray suspension D into powder C and adsorb completely to obtain powder E;

[0064] S5. Mix 0.5 g of Medicago sativa extract (alfalfa extract) with 0.5 g of ethanol, stir and disperse to obtain mixture F;

[0065] S6. Spray mixture F into powder E and adsorb completely to obtain powder G;

[0066] S7. Spray 1 g of propyltrimethoxysilane into powder G, stir and disperse to obtain powder H, and stir, heat and dry at 60 °C to obtain the sun protection and blue light resistant composite material.

[0067] Example 5

[0068] S1. Wet and disperse 100 g of boron nitride with a particle size of 10 microns in 300 g of deionized water, and then adjust the pH of the solution to 3 with hydrochloric acid to obtain slurry B;

[0069] S2. Dehydrate and wash slurry B until the pH is 6.5, and then dry to obtain powder C;

[0070] S3. Mix 20 g of nano-titanium dioxide with 20 g of ethanol and ultrasonically disperse to obtain suspension D;

[0071] S4. Spray suspension D into powder C and adsorb completely to obtain powder E;

[0072] S5. Mix 0.5 g of Medicago sativa (alfalfa extract) with 0.5 g of ethanol, stir and disperse to obtain mixture F;

[0073] S6. Spray mixture F into powder E and adsorb completely to obtain powder G;

[0074] S7. Spray 1 g of propyltrimethoxysilane into powder G, stir and disperse to obtain powder H, and stir, heat and dry at 60 °C to obtain the sun protection and blue light resistant composite material.

[0075] Example 6

[0076] S1. Wet and disperse 100 g of boron nitride with a particle size of 10 microns in 300 g of deionized water, and then adjust the pH of the solution to 3 with hydrochloric acid to obtain slurry B;

[0077] S2. Dehydrate and wash slurry B until the pH is 6.5, and then dry to obtain powder C;

[0078] S3. Mix 20 g of nano-titanium dioxide with 20 g of ethanol and ultrasonically disperse to obtain suspension D;

[0079] S4. Spray suspension D into powder C and adsorb completely to obtain powder E;

[0080] S5. Mix 2 g of Medicago sativa (alfalfa extract) with 2 g of ethanol, stir and disperse to obtain mixture F;

[0081] S6. Spray mixture F into powder E and adsorb completely to obtain powder G;

[0082] S7. Spray 1 g of propyltrimethoxysilane into powder G, stir and disperse to obtain powder H, and stir, heat and dry at 60 °C to obtain the sun protection and blue light resistant composite material.

[0083] Example 7

[0084] S1. Wet and disperse 100 g of boron nitride with a particle size of 10 microns in 300 g of deionized water, and then adjust the pH of the solution to 3 with hydrochloric acid to obtain slurry B;

[0085] S2. Dehydrate and wash slurry B until the pH is 6.5, and then dry to obtain powder C;

[0086] S3. Mix 20 g of nano-titanium dioxide with 20 g of ethanol and ultrasonically disperse to obtain suspension D;

[0087] S4. Spray suspension D into powder C and adsorb completely to obtain powder E;

[0088] S5. Mix 5 g of Medicago sativa extract (alfalfa extract) with 5 g of ethanol, stir and disperse to obtain mixture F;

[0089] S6. Spray mixture F into powder E and adsorb completely to obtain powder G;

[0090] S7. Spray 1 g of propyltrimethoxysilane into powder G, stir and disperse to obtain powder H, and stir, heat and dry at 60 °C to obtain the sun protection and blue light resistant composite material.

[0091] Example 8

[0092] S1. Wet and disperse 100 g of boron nitride with a particle size of 10 microns in 300 g of deionized water, and then adjust the pH of the solution to 3 with hydrochloric acid to obtain slurry B;

[0093] S2. Dehydrate and wash slurry B until the pH is 6.5, and then dry to obtain powder C;

[0094] S3. Mix 20 g of nano-titanium dioxide with 20 g of ethanol and ultrasonically disperse to obtain suspension D;

[0095] S4. Spray suspension D into powder C and adsorb completely to obtain powder E;

[0096] S5. Mix 2 g of Medicago sativa extract (alfalfa extract) with 2 g of ethanol, stir and disperse to obtain mixture F;

[0097] S6. Spray mixture F into powder E and adsorb completely to obtain powder G;

[0098] S7. Spray 5 g of propyltrimethoxysilane into powder G, stir and disperse to obtain powder H, and stir, heat and dry at 60 °C to obtain the sun protection and blue light resistant composite material.

[0099] Example 9

[0100] S1. Wet and disperse 100 g of boron nitride with a particle size of 10 microns in 300 g of deionized water, and then adjust the pH of the solution to 3 with hydrochloric acid to obtain slurry B;

[0101] S2. Dehydrate and wash slurry B until the pH is 6.5, and then dry it to obtain powder C;

[0102] S3. Mix 20 g of nano-titanium dioxide with 100 g of ethanol and ultrasonically disperse to obtain suspension D;

[0103] S4. Spray suspension D into powder C and adsorb completely to obtain powder E;

[0104] S5. Mix 2 g of Medicago sativa extract (alfalfa extract) with 2 g of ethanol, stir and disperse to obtain mixture F;

[0105] S6. Spray mixture F into powder E and adsorb completely to obtain powder G;

[0106] S7. Spray 5 g of propyltrimethoxysilane into powder G, stir and disperse to obtain powder H, stir, heat and dry at 60 °C to obtain the sunscreen and anti-blue light composite material.

[0107] Example 10

[0108] S1. Wet and disperse 100 g of boron nitride with a particle size of 10 microns in 300 g of deionized water, and then adjust the pH of the solution to 3 with hydrochloric acid to obtain slurry B;

[0109] S2. Dehydrate and wash slurry B until the pH is 6.5, and then dry it to obtain powder C;

[0110] S3. Mix 20 g of nano-titanium dioxide with 100 g of ethanol and ultrasonically disperse to obtain suspension D;

[0111] S4. Spray suspension D into powder C and adsorb completely to obtain powder E;

[0112] S5. Mix 2 g of Medicago sativa extract (alfalfa extract) with 10 g of ethanol, stir and disperse to obtain mixture F;

[0113] S6. Spray mixture F into powder E and adsorb completely to obtain powder G;

[0114] S7. Spray 5 g of propyltrimethoxysilane into powder G, stir and disperse to obtain powder H, stir, heat and dry at 60 °C to obtain the sunscreen and anti-blue light composite material, and conduct structural characterization on the obtained composite material. The characterization results are shown in Figure 1, As can be seen from the figure, the originally smooth surface of boron nitride has become rough, with many particles on it, indicating that a large amount of nano-sunscreen material is adsorbed on the surface of boron nitride.

[0115] Example 11

[0116] S1. Wet and disperse 100 g of boron nitride with a particle size of 10 microns in 300 g of deionized water, and then adjust the pH of the solution to 3 with hydrochloric acid to obtain slurry B;

[0117] S2. Dehydrate and wash slurry B until the pH is 6.5, and then dry it to obtain powder C;

[0118] S3. Mix 20 g of nano-zinc oxide with 100 g of ethanol and ultrasonically disperse to obtain suspension D;

[0119] S4. Spray suspension D into powder C and adsorb completely to obtain powder E;

[0120] S5. Mix 2 g of Medicago sativa L. (alfalfa extract) with 10 g of ethanol, stir and disperse to obtain mixture F;

[0121] S6. Spray mixture F into powder E and adsorb completely to obtain powder G;

[0122] S7. Spray 5 g of propyltrimethoxysilane into powder G, stir and disperse to obtain powder H, and stir, heat and dry at 60 °C to obtain the sunscreen and anti-blue light composite material.

[0123] Example 12

[0124] S1. Wet and disperse 100 g of boron nitride with a particle size of 10 microns in 300 g of deionized water, and then adjust the pH of the solution to 3 with hydrochloric acid to obtain slurry B;

[0125] S2. Dehydrate and wash slurry B until the pH is 6.5, and then dry it to obtain powder C;

[0126] S3. Mix 20 g of nano-titanium dioxide with 100 g of ethanol and ultrasonically disperse to obtain suspension D;

[0127] S4. Spray suspension D into powder C and adsorb completely to obtain powder E;

[0128] S5. Mix 2 g of anthocyanin (blueberry extract) with 10 g of ethanol, stir and disperse to obtain mixture F;

[0129] S6. Spray mixture F into powder E and adsorb completely to obtain powder G;

[0130] S7. Spray 5 g of propyltrimethoxysilane into powder G, stir and disperse to obtain powder H, 60

[0131] Stir, heat, and dry at ℃ to obtain the sunscreen and blue light resistant composite material.

[0132] Comparative Example 1

[0133] This comparative example is similar to Example 10, except that no sunscreen material is added in this comparative example.

[0134] S1. Wet and disperse 100 g of boron nitride with a particle size of 10 microns in 300 g of deionized water, and then adjust the pH of the solution to 3 with hydrochloric acid to obtain slurry B;

[0135] S2. Dehydrate and wash slurry B until the pH is 6.5, and then dry it to obtain powder C;

[0136] S3. Mix 2 g of Medicago sativa (alfalfa extract) with 10 g of ethanol, and stir and disperse to obtain mixture D;

[0137] S4. Spray mixture D into powder C and adsorb completely to obtain powder E;

[0138] S5. Spray 5 g of propyltrimethoxysilane into powder E, stir and disperse to obtain powder F, stir, heat, and dry at 60 °C to obtain the sunscreen and blue light resistant composite material.

[0139] Comparative Example 2

[0140] This comparative example is similar to Example 10, except that no blue light absorber is added in this comparative example.

[0141] S1. Wet and disperse 100 g of boron nitride with a particle size of 10 microns in 300 g of deionized water, and then adjust the pH of the solution to 3 with hydrochloric acid to obtain slurry B;

[0142] S2. Dehydrate and wash slurry B until the pH is 6.5, and then dry it to obtain powder C;

[0143] S3. Mix 20 g of nano-titanium dioxide with 100 g of ethanol and ultrasonically disperse to obtain suspension D;

[0144] S4. Spray suspension D into powder C and adsorb completely to obtain powder E;

[0145] S5. Spray 5 g of propyltrimethoxysilane into powder E, stir and disperse to obtain powder F, stir, heat, and dry at 60 °C to obtain the sunscreen and blue light resistant composite material.

[0146] Comparative Example 3

[0147] This comparative example is similar to Example 10, except that no coupling agent is added in this comparative example.

[0148] S1. Wet and disperse 100 g of boron nitride with a particle size of 10 microns in 300 g of deionized water, and then adjust the pH of the solution to 3 with hydrochloric acid to obtain slurry B;

[0149] S2. Wash the slurry B by dehydration until the pH is 6.5, and then dry it to obtain powder C;

[0150] S3. Mix 20 g of nano-titanium dioxide with 100 g of ethanol and disperse it ultrasonically to obtain suspension D;

[0151] S4. Spray the suspension D into the powder C and adsorb it completely to obtain powder E;

[0152] S5. Mix 2 g of Medicago sativa extract with 10 g of ethanol and stir to disperse to obtain mixture F;

[0153] S6. Spray the mixture F into the powder E and adsorb it completely to obtain powder G;

[0154] S7. Stir and heat-dry the powder G at 60 °C to obtain the sunscreen and anti-blue light composite material.

[0155] Comparative Example 4

[0156] This comparative example is similar to Example 10, except that in this comparative example, various raw materials are simply mechanically mixed.

[0157] S1. Place 100 g of boron nitride with a particle size of 10 microns in a mixing crusher and mix evenly to obtain powder A;

[0158] S2. Add 20 g of nano-titanium dioxide to the powder A and mix evenly to obtain powder B;

[0159] S3. Add 2 g of Medicago sativa extract to the powder B and mix evenly to obtain powder C;

[0160] S4. Add 5 g of propyltrimethoxysilane to the powder C, stir and disperse to obtain powder D, and then dry the powder D at 60 °C to obtain the sunscreen and anti-blue light composite material.

[0161] Performance Test

[0162] SPF Value Test: The SPF value is an indicator to measure the ability of a sunscreen product to resist UVB (medium-wave ultraviolet rays). It represents how many times longer the skin can be exposed to sunlight after using the sunscreen product compared to not using it. The Labsphere UV-2000S SPF analyzer was used in this measurement. First, specific temperature and humidity conditions need to be set. Then, an appropriate amount of boron nitride with sunscreen and anti-blue light properties is weighed and evenly applied on the test plate. After waiting for a period of time to ensure its stability, the test is carried out. First, the blank test plate without the application of boron nitride with sunscreen and anti-blue light properties is tested as a reference, and then the plate with the application of boron nitride with sunscreen and anti-blue light properties is tested. Through the calculation of the tester, a test report of the SPF value can be automatically generated. The higher the SPF value, the better the sunscreen effect.

[0163] Blue Light Absorption Rate Test: The blue light absorption rate can effectively represent the efficiency of the product to absorb blue light and can be calculated through the following formula: blue light absorption rate = 100% - blue light transmittance (τsb), where the blue light transmittance can be obtained by testing with a blue light spectrum analyzer. In this measurement, the SS900EN blue light spectrum analyzer was used. First, the instrument was calibrated. The wavelength and photometric linearity were calibrated using a standard light source (such as a xenon lamp), and the error should be ≤ ±0.5 nm. The blue light hazard weighting function (B(λ)) and the spectral response curve were calibrated to ensure compliance with the IEC 62471 standard. The sample was evenly coated or loaded into a cuvette, and the thickness needs to be marked (such as the reference thickness of the lens is 2.0 ± 0.1 mm). The light source to be measured was aligned with the instrument probe (cosine corrector), and the distance was maintained at 10 cm to meet the optical path requirements. The wavelength range was set to 300 - 800 nm (the main measurement area of blue light hazard). According to the type of light source, "single measurement" or "continuous monitoring" was selected, and the scan was started through the touch screen or computer software to display the spectral curve in real time and record the required key parameters (such as the blue light peak wavelength, blue light transmittance).

[0164] Table 1 shows the raw material dosages used in the sunscreen and anti-blue light composite materials in Examples 1 - 12 and Comparative Examples 1 - 3 of the present invention, as well as the test results of the SPF value and the blue light absorption rate. Table 1 Test Results of the SPF Value and Blue Light Absorption Rate of Boron Nitride with Sunscreen and Anti-Blue Light Properties Obtained from Examples and Comparative Examples

[0165]

[0166]

[0167] From the comparison of Example 1, Example 2, and Example 3, the particle size of boron nitride will affect the SPF value and the blue light absorption rate to a certain extent. The larger the particle size of boron nitride, the more nano-sunscreen and blue light absorber it can adsorb on its surface. In theory, the SPF value and the blue light absorption rate will be higher. However, the larger the particle size of boron nitride, the smaller its specific surface area, the lower the proportion of surface atoms, the fewer active sites, and it will be more difficult to process. Moreover, during use, the dispersibility will be worse, resulting in serious agglomeration, which will reduce its sunscreen and anti-blue light effects. Therefore, it is necessary to reasonably control the particle size. In the embodiments of the present invention, when the particle size of boron nitride is 10 microns, its SPF value and anti-blue light effect are the most ideal.

[0168] From the comparison of Example 2, Example 4, and Example 5, the more nano-sunscreen materials, the higher the SPF value and the blue light absorption rate. However, limited by the surface area of flaky boron nitride, when the sunscreen materials reach a certain amount, it will be at a peak point. If it is excessive, it will cause waste and increase costs. In the embodiments of the present invention, when the content of the sunscreen material accounts for 20Wt% of the mass of boron nitride, the SPF value and the blue light absorption rate are the most ideal and the effect is the best.

[0169] From the comparison of Example 5, Example 6, and Example 7, the blue light absorber can effectively defend against blue light. In theory, the more blue light absorbers, the stronger the ability to defend against blue light. However, on the limited surface of boron nitride, the amount of blue light absorber it can accommodate is limited. Too much will lead to increased costs but the effect is not obvious.

[0170] From the comparison of Example 6 and Example 8, the more coupling agents, the higher the SPF value and the blue light absorption rate. The coupling agent can increase the grafting rate of chemical bonds. The higher the grafting rate, the better its adsorption effect, and the SPF value and the blue light absorption rate will be higher. However, the amount of chemical bonds of each boron nitride is limited. When the amount of coupling agent reaches a certain level, the grafting rate of chemical bonds will reach the maximum. Increasing further will cause overflow and may instead affect the SPF value and the blue light absorption rate.

[0171] From the comparison of Example 8 and Example 9, and Example 9 and Example 10, the more solvent, the more beneficial it is to the dispersion of nano-sunscreen materials and blue light absorbers, and the higher the adsorption rate on the surface of boron nitride, and the higher the SPF value and the blue light absorption rate. However, the amount of solvent needs to be moderate. The solvent content cannot be too high. Too much will cause boron nitride to be too wet and agglomerate, which is not conducive to the adsorption of nano-materials and blue light absorbers.

[0172] From the comparison of Example 10 and Example 11, the effects of using nano-titanium dioxide as a sunscreen material and using nano-zinc oxide as a sunscreen material are basically the same.

[0173] Comparing Example 10 with Example 12, using Medicago sativa extract as a blue light absorber has a better effect than using anthocyanin (blueberry extract) as a blue light absorber, with higher SPF value and blue light absorption rate.

[0174] Comparing Example 10 with Comparative Example 1, the addition of the nano sunscreen material can significantly improve the SPF value and blue light absorption rate of boron nitride, indicating that the nano sunscreen material can effectively absorb ultraviolet light.

[0175] Comparing Example 10 with Comparative Example 2, the addition of the blue light absorber can significantly improve the SPF value and blue light absorption rate of boron nitride, indicating that the blue light absorber can effectively absorb ultraviolet light and blue light irradiation.

[0176] Comparing Example 10 with Comparative Example 3, the addition of the coupling agent can significantly improve the SPF value and blue light absorption rate of boron nitride. The addition of the coupling agent can increase the chemical grafting rate, making the nano sunscreen material and the blue light absorber more effectively grafted on the surface of boron nitride.

[0177] Comparing Example 10 with Comparative Example 4, the sun protection and blue light resistant composite material prepared by ordinary mechanical mixing has an unsatisfactory sun protection and blue light resistant effect. This is because ordinary mechanical mixing only adsorbs the nano sunscreen material and the blue light absorber on the surface of boron nitride through simple physical adsorption, and it will fall off at any time. After falling off, the sun protection and blue light resistant effect will be lost, which is far less firm than chemical grafting.

[0178] Application Test

[0179] Add the boron nitride used in the above blank control, as well as the sun protection and blue light resistant composite materials prepared in Example 10, Example 11, Example 12, Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4 to the sunscreen lotion, and test their SPF values and blue light absorption rates. The results are shown in Table 2.

[0180] Table 2 Formulation Ratio of Sunscreen Lotion Prepared from Sun Protection and Blue Light Resistant Boron Nitride in Examples and Comparative Examples

[0181]

[0182]

[0183]

[0184] Formulation Process of Sunscreen Lotion:

[0185] 1. After weighing Phase A, add it to a beaker, heat it to 80 °C in a water bath, stir and disperse evenly, and homogenize for 3 minutes;

[0186] 2. Weigh another beaker while holding it in your hand. After weighing, heat it in a water bath to 80 °C and stir until it dissolves into a transparent state.

[0187] 3. Slowly add the dissolved Phase B to Phase A while stirring. After adding, homogenize for 5 minutes to ensure complete emulsification.

[0188] 4. Stir and cool down to 45 °C, add Phase C, stir evenly, and cool to below 35 °C before discharging.

[0189] Table 3 shows the SPF values and blue light absorption rate test results of the sunscreen lotion prepared in Table 2 above.

[0190] Sun protection lotion SPF value Blue light absorption rate Boron nitride (blank control) 0 0 Example 10 287 84.95％ Example 11 269 84.13％ Example 12 253 81.53％ Comparative example 1 98 53.26％ Comparative example 2 65 26.21％ Comparative example 3 123 62.19％ Comparative example 4 83 39.81％

[0191] From the above comparison results, it can be seen that the boron nitride with sunscreen and anti-blue light properties prepared in Example 10, Example 11, and Example 12 has significant sunscreen and anti-blue light effects when applied in the sunscreen lotion formula, while Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4 are relatively poor.

[0192] From the above test results (Table 1, Table 3), it can be seen that Example 10 has the best effect, that is, when the particle size of boron nitride is 10 microns, the usage amount of the nano sunscreen material is 20Wt% of boron nitride, the ratio of the nano sunscreen material to the solvent is 1:5, the usage amount of the blue light absorber is 2Wt% of boron nitride, the ratio of the blue light absorber to the solvent is 1:5, and the usage amount of the coupling agent is 5Wt% of boron nitride, the performance is optimal.

[0193] Obviously, the above examples are only for clearly illustrating the examples and are not limitations on the implementation methods. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A composite material with sunscreen and anti - blue light properties, characterized in that, Boron nitride is used as a carrier, the surface of the boron nitride is coated with a sunscreen material layer and a blue light absorber layer, and the surface of the sunscreen material layer is coated with a silane coupling agent layer.

2. The sunscreen and blue light resistant composite material according to claim 1, characterized in that, The particle size of the composite material is 1 micron to 100 microns.

3. The composite material with sunscreen and anti-blue light function according to claim 1, wherein The sunscreen material is one or more of nano titanium dioxide, nano zinc oxide, and nano cerium oxide.

4. The composite material with sunscreen and anti-blue light function according to claim 1, characterized in that, The content of the sunscreen material in the sunscreen material layer accounts for 0.1 to 50 wt% of the composite material.

5. The composite material with sun protection and anti-blue light according to claim 1, characterized in that, The blue light absorber in the blue light absorber layer includes one or more of alfalfa, rutin, anthocyanin, and cassia seed extract; The amount of the blue light absorber is 0.1% to 10% by weight of the composite material.

6. The sunscreen and anti-blue light composite material according to claim 1, wherein The silane coupling agent in the silane coupling agent layer is selected from one or more of methyltrimethoxysilane, methyltriethoxysilane, polymethyltriethoxysilane, propyltrimethoxysilane, propyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, octyltrimethoxysilane and octyltriethoxysilane; The amount of the silane coupling agent used is 0.1 to 10 wt% of the mass of the composite material.

7. The preparation method of the sunscreen and anti-blue light composite material according to any one of claims 1 to 6, characterized in that, The following steps are involved: Provide a boron nitride, denoted as powder A; Wetting and dispersing powder A in deionized water, and then adjusting the pH of the solution to 1-4 with an acidic regulator to obtain slurry B; The slurry B is dehydrated and washed with water until it is neutral, and then dried to obtain powder C; The sunscreen material is mixed with a solvent and ultrasonically dispersed to obtain a suspension D; The suspension D is sprayed into the powder C, and the powder E is obtained after complete adsorption; The blue light absorber is mixed with the solvent, and after stirring and dispersing, a mixed solution F is obtained; The mixed liquid F is sprayed into the powder E, and the powder G is obtained after complete adsorption; Then, the silane coupling agent is sprayed into the powder G, and the powder H is obtained by stirring and dispersing, and the powder H is heated and dried to obtain the sun-proof and anti-blue light composite material.

8. The preparation method according to claim 7, characterized in that, The acidic regulator is one or more of hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid; The solvent is one or more of ethanol, isopropanol, water, and ethylene glycol; The mass ratio of the sunscreen material to the solvent is (1:1) to (1:20); The mass ratio of the blue light absorber to the solvent is (1:1) to (1:20).

9. The preparation method according to claim 7, characterized in that, The drying temperature is 30° C. to 100° C., and the drying time is 1 to 10 hours.

10. A sunscreen cosmetic, characterized in that, A composite material comprising the sunscreen and anti-blue light properties as described in any one of claims 1 to 6.

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