Efficient radiation refrigeration sunscreen cream as well as preparation method and application thereof

Abstract

The invention provides efficient radiation refrigeration sunscreen cream as well as a preparation method and application thereof. The sunscreen cream with the radiation refrigeration function is prepared from the following components in parts by weight: 0.1 to 99.9 parts of metal oxide, 0.1 to 99.9 parts of iron oxide pigment and 0.1 to 99.9 parts of solvent. The sunscreen cream provided by the invention has excellent radiation refrigeration effect and sunscreen function, and has the characteristics of high ultraviolet stability, water resistance and no deterioration after being placed for a long time, and the method for preparing the sunscreen cream has the characteristics of simplicity, low cost, environmental friendliness, easiness in large-scale production and the like.

Description

Technical Field

[0001] The invention belongs to the field of sunscreen creams, and in particular relates to a highly efficient radiation cooling sunscreen cream and a preparation method and application thereof. Background Art

[0002] Refrigeration technology plays an irreplaceable role in keeping people comfortable and healthy in hot environments, buildings cool and livable, and electronic equipment operating normally. Traditional refrigeration equipment (such as air conditioners) consumes up to 15% of the world's total electricity generation each year, accounting for about 40% of building energy consumption, and is accompanied by a large amount of greenhouse gas emissions. In the face of increasingly stringent energy-saving requirements under the "dual carbon" goals, it is urgent to develop a new low-energy refrigeration technology.

[0003] Radiative cooling is a passive cooling technology that achieves cooling through thermal radiation. This technology does not require any earth energy consumption and has no carbon emissions. It is an ideal "zero-carbon" cooling technology. The mechanism of radiative cooling is to use the inherent temperature difference in nature (such as the temperature between human body and ambient temperature, the temperature between the earth and outer space) to achieve passive cooling. The 8-13μm band is called the "atmospheric transparent window" and has extremely high infrared transmittance. The material has a high emissivity in the 8-13μm band, and the huge temperature difference between the earth's surface and outer space (minus 270℃) can be used to transfer surface heat directly to outer space, thereby achieving a significant cooling effect and achieving efficient sub-ambient cooling in hot environments. Common radiative cooling materials include: photonic crystals based on inorganic dielectric materials, organic polymer nano-metamaterials, and nano-designed organic-inorganic composite materials.

[0004] Thermal radiation is the main way for the human body to dissipate heat, accounting for 40%-60%. Therefore, radiation cooling technology has great application potential in human thermal management. At present, only radiation cooling fabrics can apply radiation cooling technology to the human body. Applying radiation cooling technology to the field of sunscreen can protect human skin from ultraviolet rays (premature aging, skin cancer) in high-temperature outdoor environments while cooling the human body to keep the surface temperature of the human body at a comfortable level. Therefore, there is an urgent need to develop a sunscreen with radiation cooling function to enrich the application of radiation cooling technology in the field of human thermal management. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. The purpose of the present invention is to enrich the singleness of the application mode of radiation cooling technology in the field of human thermal management, and provide a sunscreen with radiation cooling effect. The radiation cooling sunscreen has excellent radiation cooling performance, stable performance, UV stability, waterproofness, long shelf life and other advantages, and the method for preparing the sunscreen is simple, low cost, environmentally friendly and easy to mass produce. The provided sunscreen can be used in outdoor high temperature environment and applied to human skin.

[0006] Specifically, the present invention provides the following technical solutions:

[0007] The first aspect of the present invention provides a sunscreen with a radiation cooling effect, comprising, by weight:

[0008] 0.1-99.9 parts of metal oxides,

[0009] 0.1-99.9 parts of iron oxide pigment,

[0010] and 0.1-99.9 parts of a solvent.

[0011] According to an embodiment of the present invention, the invention comprises, by weight:

[0012] 1 to 5 parts of metal oxide,

[0013] 1 to 5 parts of iron oxide pigment,

[0014] and 14 to 95 parts of a solvent.

[0015] According to an embodiment of the present invention, the metal oxide is selected from at least one of ZnO, CaO, Al2O3, TiO2, MgO, BaSO4, CaCO3, Fe2O3, and Na2O;

[0016] The solvent is selected from at least one of deionized water, ethanol, liquid paraffin, glyceryl stearate, palmitic acid, sodium hydroxide, cetyl alcohol, propylene glycol, glycerin, and polydimethylsiloxane.

[0017] The second aspect of the present invention provides a method for preparing the sunscreen with radiant cooling effect as described in the first aspect, comprising:

[0018] (1) Preliminarily mixing a certain proportion of metal oxide, iron oxide pigment and solvent to obtain a mixed solution;

[0019] (2) The mixed solution in (1) is continuously mixed and heat-treated to obtain a uniform emulsion.

[0020] According to an embodiment of the present invention, the concentration of the metal oxide in step (1) is 0.01-5 g / mL;

[0021] The mass ratio of the metal oxide, the iron oxide pigment, and the solvent is (1-5):(1-5):20.

[0022] According to an embodiment of the present invention, the heat treatment temperature in step (2) is 30-80° C. and the time is 0.1-600 h.

[0023] According to an embodiment of the present invention, the preliminary mixing method in step (1) is selected from at least one of oil bath heating / magnetic stirring / mechanical stirring / ultrasound / oven heating;

[0024] The continuous mixing method in step (2) is selected from at least one of oil bath heating / magnetic stirring / mechanical stirring / ultrasound / oven heating.

[0025] The third aspect of the present invention provides use of the sunscreen with radiant cooling effect described in the first aspect in the field of outdoor sun protection.

[0026] According to an embodiment of the present invention, the outdoor environment is an outdoor high temperature environment.

[0027] According to an embodiment of the present invention, the outdoor high temperature environment is 25-50° C. In this environment, the radiant cooling sunscreen can cool the skin by 4.2-6° C. If the surface of the sunscreen is intact, it can provide all-day protection, and the optical properties of the sunscreen remain unchanged after being measured for 30 days.

[0028] The sunscreen provided by the present invention has at least the following advantages:

[0029] (1) The provided sunscreen has excellent radiation cooling performance and stable performance, and has multiple advantages such as UV stability, water resistance, and long shelf life.

[0030] (2) By changing the content of different components, the color and the spectral properties of the material itself can be regulated, so as to optimize the effect of radiation cooling performance. At the same time, the resulting sunscreen has a long shelf life, high UV stability and water resistance.

[0031] (3) The method for preparing sunscreen has the advantages of being simple, low-cost, environmentally friendly and easy to scale up. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 These are SEM images and mapping images of the radiative cooling sunscreen provided according to an embodiment of the present invention.

[0033] Figure 2It is a solar spectrum characteristic curve and an infrared spectrum characteristic curve of the radiative cooling sunscreen provided according to an embodiment of the present invention.

[0034] Figure 3 It is a graph showing infrared spectrum characteristics of the radiation cooling sunscreen provided according to an embodiment of the present invention.

[0035] Figure 4 This is an actual temperature test curve of the radiant cooling sunscreen provided according to an embodiment of the present invention and a common commercial sunscreen in an outdoor high temperature environment. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0037] The present invention provides a sunscreen with a radiation cooling function, comprising: 0.1-99.9 parts of metal oxide, 0.1-99.9 parts of iron oxide pigment, and 0.1-99.9 parts of solvent. According to a preferred embodiment, in parts by weight, it comprises: 1-5 parts of metal oxide, 1-5 parts of iron oxide pigment, and 14-95 parts of solvent.

[0038] The metal oxides mentioned include but are not limited to several of ZnO, CaO, Al2O3, TiO2, MgO, BaSO4, CaCO3, Fe2O3, and Na2O. According to a specific embodiment, the particle size of these metal oxides is in the range of 0.001-100 μm. According to a preferred embodiment, the metal oxide is at least one of Fe2O3, Al2O3, ZnO, BaSO4, and TiO2. According to a more preferred embodiment, the metal oxide is Fe2O3 and Al2O3; or the metal oxide is TiO2; or the metal oxide is ZnO.

[0039] The solvent mentioned includes but is not limited to one or more of deionized water, ethanol, liquid paraffin, glyceryl stearate, palmitic acid, sodium hydroxide, cetyl alcohol, propylene glycol, glycerol, and polydimethylsiloxane. According to a preferred embodiment, the solvent is a mixture of one or more of deionized water, ethanol, glycerol, and polydimethylsiloxane.

[0040] After these ingredients are mixed, they can be heated and stirred by means of oil bath heating / magnetic stirring / mechanical stirring / ultrasound / oven heating, etc. to obtain the final sunscreen lotion.

[0041] The present invention also provides a method for preparing a sunscreen with a radiation cooling effect, comprising the following steps:

[0042] (1) Preliminary mixing of metal oxide, iron oxide pigment, and solvent;

[0043] (2) The solution in (1) is continuously subjected to heat treatment to obtain a uniform emulsion.

[0044] The method provided by the invention has the characteristics of simplicity, low cost, environmental friendliness, easy large-scale production, etc. The obtained radiation cooling sunscreen has excellent radiation cooling effect and sun protection function, and also has the characteristics of high ultraviolet stability, water resistance and long-term storage without deterioration.

[0045] The concentration of the metal oxide in step (1) is 0.01-2.5 g / mL. The preliminary mixing can be performed simply, or by heating in an oil bath, magnetic stirring, mechanical stirring, ultrasound, oven heating, etc. After the preliminary mixing, the heat treatment can be continued to obtain a uniform emulsion.

[0046] According to a specific implementation, the heat treatment temperature in step (2) is 30-80°C and the time is 0.1-600h.

[0047] The radiant cooling sunscreen mentioned is used in outdoor high temperature environments to achieve the effect of radiant cooling.

[0048] The radiation cooling sunscreen is used as a sunscreen for different outdoor environments, different outdoor temperatures and people with different skin colors and skin types.

[0049] The technical scheme of the present invention is further described below in conjunction with specific embodiments. It should be noted that these embodiments are only used to facilitate the understanding of those skilled in the art and should not be regarded as the Xi'an of the scope of the present invention. The raw materials used in the present invention are all commercially available analytically pure products without purification treatment.

[0050] Example 1

[0051] Example 1 A sunscreen with a radiant cooling effect is prepared by the following method, comprising:

[0052] (1) Weigh 0.06 g of Fe2O3 and 0.04 g of Al2O3, 6 g of deionized water, 3.4 g of polydimethylsiloxane and 0.5 g of iron oxide pigment, and mix them (the total concentration of metal oxides is 10 mg / mL).

[0053] (2) The solution in (1) was then heated in an oil bath with continuous mixing and heating overnight to obtain a uniform emulsion.

[0054] Example 2

[0055] Example 2 A sunscreen with a radiant cooling effect is prepared by the following method, comprising:

[0056] (1) Weigh 0.2 g of Fe2O3, 5 g of deionized water, 2 g of glycerol, 1.3 g of propylene glycol, 1 g of ethanol and 0.5 g of iron oxide pigment and mix them (the total concentration of metal oxides is 20 mg / mL).

[0057] (2) The solution in (1) was then continuously mixed by magnetic stirring and heated overnight to obtain a uniform emulsion.

[0058] Example 3

[0059] Example 3 A sunscreen with a radiant cooling effect is prepared by the following method, comprising:

[0060] (1) Weigh 0.12 g of MgO, 6 g of deionized water, 3.38 g of propylene glycol and 0.5 g of iron oxide pigment and mix them (the total concentration of metal oxides is 12 mg / mL).

[0061] (2) The solution in (1) was then heated and stirred in an oil bath and continuously mixed and heated overnight to obtain a uniform emulsion.

[0062] Example 4

[0063] Example 4 A sunscreen with a radiant cooling effect is prepared by the following method, comprising:

[0064] (1) Weigh 2.5 g ZnO, 5 g ethanol, 2 g glycerol and 0.5 g iron oxide pigment and mix them.

[0065] (2) The solution in (1) was then continuously mixed by magnetic stirring and heated overnight to obtain a uniform emulsion.

[0066] Example 5

[0067] Example 5 A sunscreen with a radiant cooling effect is prepared by the following method, comprising:

[0068] (1 Weigh 0.1 g ZnO, 0.15 g BaSO4, 5 g ethanol, 4.25 g glycerol and 0.5 g iron oxide pigment and mix.

[0069] (2) The solution in (1) was then continuously mixed by magnetic stirring and heated overnight to obtain a uniform emulsion.

[0070] Example 6

[0071] Example 6 A sunscreen with a radiant cooling effect is prepared by the following method, comprising:

[0072] (1) Weigh 0.15 g of BaSO4, 4 g of ethanol, 3 g of glycerol, 1 g of propylene glycol, 1.35 g of polydimethylsiloxane and 0.5 g of iron oxide pigment and mix them.

[0073] (2) The solution in (1) was then continuously mixed by mechanical stirring and heated overnight to obtain a uniform emulsion.

[0074] Example 7

[0075] Example 7 A sunscreen with a radiant cooling effect is prepared by the following method, comprising:

[0076] (1) Weigh 0.08 g BaSO4 and 0.07 g MgO, 6 g ethanol, 3.35 g polydimethylsiloxane and 0.5 g iron oxide pigment and mix them.

[0077] (2) The solution in (1) was then continuously mixed by mechanical stirring and heated overnight to obtain a uniform emulsion.

[0078] Example 8

[0079] Example 8 A sunscreen with a radiant cooling effect is prepared by the following method, comprising:

[0080] (1) Weigh 0.03 g of CaO and 0.07 g of CaCO3, 6 g of ethanol, 3.4 g of polydimethylsiloxane and 0.5 g of iron oxide pigment and mix them.

[0081] (2) The solution in (1) was then continuously mixed by magnetic stirring and heated overnight to obtain a uniform emulsion.

[0082] Example 9

[0083] Example 9 A sunscreen with a radiant cooling effect is prepared by the following method, comprising:

[0084] (1) Weigh 2.5 g TiO2, 5 g deionized water, 1 g ethanol, 1 g polydimethylsiloxane and 0.5 g iron oxide pigment and mix them.

[0085] (2) The solution in (1) was then continuously mixed by magnetic stirring and heated to 80° C. overnight to obtain a uniform emulsion.

[0086] Taking the radiation cooling sunscreen prepared in Example 9 as an example, and taking commercial organic sunscreen and inorganic sunscreen as reference, its various performances are characterized as follows:

[0087] Figure 1 These are the SEM images and mapping images of the radiation cooling sunscreen prepared according to Example 9. It can be seen that the ingredients in the radiation cooling sunscreen are evenly distributed.

[0088] Figure 2 The solar spectrum characteristic curve diagram of the radiation cooling sunscreen prepared according to Example 9. Figure 3 This is the infrared spectrum characteristic curve of the radiation cooling sunscreen prepared according to Example 9. From the sunlight radiation curve of the radiation cooling sunscreen, it can be seen that the radiation cooling sunscreen has a high reflectivity in the sunlight band, and the reflectivity is 90.19%, which is much higher than that of ordinary commercial sunscreens (such as Figure 2 The emissivity of the radiative cooling sunscreen in the mid- and far-infrared bands is 92.9%, which is also higher than that of ordinary commercial sunscreens (such as Figure 3 shown).

[0089] Similarly, the reflectivity and emissivity corresponding to other embodiments are shown in the following table:

[0090] Table 1 Characterization results of different embodiments

[0091] Reflectivity, emissivity and SPF results Example 1 Reflectivity is 90.5%, emissivity is 93.5%, SPF value is 53 Example 2 Reflectivity is 91.2%, emissivity is 85%, SPF value is 40 Example 3 Reflectivity is 90.8%, emissivity is 75%, SPF value is 43 Example 4 Reflectivity is 92.5%, emissivity is 93.3%, SPF value is 52 Example 5 Reflectivity is 92.7%, emissivity is 80.2%, SPF value is 54 Example 6 Reflectivity is 91.2%, emissivity is 93%, SPF value is 20 Example 7 Reflectivity is 90.5%, emissivity is 92.1%, SPF value is 25 Example 8 Reflectivity is 80.9%, emissivity is 94%, SPF value is 22

[0092] Figure 3 The actual temperature test curves of the radiant cooling sunscreen and ordinary commercial sunscreen in outdoor high temperature environment are obtained according to Example 9. Figure 4 Compared with bare skin, skin covered with organic sunscreen and skin covered with inorganic sunscreen, the radiant cooling sunscreen can cool down skin by 10.4℃, 6.14℃ and 5.57℃ respectively (Fig. Figure 4 b); 4.06℃, 6.13℃ and 3.02℃( Figure 4 d); 1.67℃, 4.4℃ and 2.31℃( Figure 4 (as shown in e).

[0093] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific implementation" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0094] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A sunscreen with radiant cooling effect, characterized in that: In parts by weight, it includes: 0.1-99.9 parts of metal oxides, 0.1-99.9 parts of iron oxide pigment, and 0.1-99.9 parts of a solvent.

2. The sunscreen with radiant cooling effect according to claim 1, characterized in that: In parts by weight, it includes: 1 to 5 parts of metal oxide, 1 to 5 parts of iron oxide pigment, and 14 to 95 parts of a solvent.

3. The sunscreen with radiant cooling effect according to claim 1, characterized in that: The metal oxide is selected from at least one of ZnO, CaO, Al2O3, TiO2, MgO, BaSO4, CaCO3, Fe2O3, and Na2O; The solvent is selected from at least one of deionized water, ethanol, liquid paraffin, glyceryl stearate, palmitic acid, sodium hydroxide, cetyl alcohol, propylene glycol, glycerin, and polydimethylsiloxane.

4. The method for preparing the sunscreen with radiant cooling effect according to any one of claims 1 to 3, characterized in that: include: (1) Preliminarily mixing a certain proportion of metal oxide, iron oxide pigment and solvent to obtain a mixed solution; (2) The mixed solution in (1) is continuously mixed and heat-treated to obtain a uniform emulsion.

5. The method for preparing a sunscreen with a radiation cooling effect according to claim 4, characterized in that: The concentration of the metal oxide in step (1) is 0.01-5 g / mL; The mass ratio of the metal oxide, the iron oxide pigment, and the solvent is (1-5):(1-5):

20.

6. The method for preparing a sunscreen with a radiation cooling effect according to claim 4, characterized in that: The heat treatment temperature in step (2) is 30-80°C and the time is 0.1-600h.

7. The method for preparing a sunscreen with a radiation cooling effect according to claim 4, characterized in that: The preliminary mixing method in step (1) is selected from at least one of oil bath heating / magnetic stirring / mechanical stirring / ultrasound / oven heating; The continuous mixing method in step (2) is selected from at least one of oil bath heating / magnetic stirring / mechanical stirring / ultrasound / oven heating.

8. Use of the sunscreen with radiant cooling effect according to any one of claims 1 to 3 in the field of outdoor sun protection.

9. The use according to claim 8, characterized in that The outdoor environment is a high temperature outdoor environment.

10. The use according to claim 8, characterized in that The outdoor high temperature environment is 25-50°C.

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