A carbon-coated nanometer far-infrared ceramic composite material, a preparation method and application thereof

Abstract

The application discloses a carbon-coated nano far-infrared ceramic composite material, a preparation method and application thereof, and relates to the technical field of novel functional material preparation, and comprises the following steps: preparing 0.1 mol / L of a trimethylol aminomethane aqueous solution, preparing polydopamine-coated nano far-infrared ceramic iron-loaded particles, preparing carbon-coated nano far-infrared ceramic iron-loaded composite material, and loading MOF on the surface of the carbon-coated nano far-infrared ceramic composite material. The far-infrared radiation emitted by the nano far-infrared ceramic powder can stimulate the heat receptors in the skin, expand blood vessels, and accelerate blood circulation, so that the molecules of the organism can be excited to be in a higher vibration state, the activity of biological macromolecules such as nucleic acid proteins is activated, and the functions of the biological macromolecules in regulating the metabolism, immunity and other activities of the organism are exerted, which is beneficial to the recovery and balance of functions and promotes and improves the blood circulation of the skin.

Description

Technical Field

[0001] This invention relates to the field of novel functional material preparation technology, and in particular to a carbon-coated nano-far-infrared ceramic composite material, its preparation method and application. Background Technology

[0002] In recent years, with the improvement of people's living standards and the enhancement of health awareness, more and more people have begun to pay attention to skin care. The skin is the largest organ in the human body, undertaking important functions such as protecting the body, regulating body temperature, and eliminating waste. Therefore, protecting the skin has become increasingly important. People often use various skin care products, face masks, and beauty salons for skin care to protect their skin. They also pay attention to healthy eating and regular exercise to maintain overall health and achieve the goal of protecting their skin. More and more people realize that skin care is not only a necessity for appearance but also a guarantee of health. Especially in recent years, air quality has gradually deteriorated, with a large amount of fine particulate matter suspended in the air, containing a large amount of heavy metals, microorganisms, and other harmful substances. These fine particulate matter are less than 2.5 micrometers in diameter, small in size, and highly active, easily adhering to the skin and penetrating deep into the pores, causing a significant impact on human health.

[0003] However, current skin cleansing and care products on the market are poorly effective at removing fine particles with diameters ranging from 4 to 100 nm. These particles easily accumulate in skin pores, clogging them and leading to adverse symptoms such as facial itching, inflammation, and acne. Furthermore, existing skin cleansing and care products have negligible effects on promoting and improving skin blood circulation, as well as on restoring and balancing skin function, and therefore cannot meet people's demand for high-quality skin cleansing and care products. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a carbon-coated nano far-infrared ceramic composite material, which, when combined with other skin cleansing and care product ingredients, enhances the skin's cleansing ability, effectively eliminates bacteria on the skin surface, promotes and improves blood circulation, and enhances the skin's restorative and balancing effects.

[0005] To address the aforementioned technical problems, this invention also provides a method for preparing carbon-coated nano-far-infrared ceramic composite materials, the specific steps of which are as follows:

[0006] (1) Prepare a 0.1 mol / L aqueous solution of tris(hydroxymethyl)aminomethane and adjust its pH value to 8-9 with hydrochloric acid as a buffer solution.

[0007] (2) Add nano far-infrared ceramic powder to the buffer solution at a ratio of 500-1000 mL / g, and stir under ultrasonic assistance for 30-120 min to obtain a uniformly dispersed suspension. Then add 2 times the mass of nano far-infrared ceramic powder, dopamine hydrochloride and 1-2 times the mass of ferric chloride hexahydrate, and stir for 8-24 h to allow dopamine to undergo in-situ polymerization on the surface of nano far-infrared ceramic powder to generate polydopamine, which encapsulates the nano far-infrared ceramic powder and embeds Fe particles in the polydopamine. Then centrifuge to separate the particles, wash the precipitate with water and ethanol respectively, and dry it in a forced-air drying oven to obtain polydopamine-coated nano far-infrared ceramic iron-carrying particles.

[0008] (3) Transfer polydopamine-coated nano-far-infrared ceramic iron-carrying particles to a tube furnace, and heat to 750-850℃ at a heating rate of 5℃ / min under an argon atmosphere. Hold for 2-5 hours to allow polydopamine to fully carbonize and decompose, exposing more iron particles and forming a composite material in which polydopamine carbon is coated on the surface of nano-far-infrared ceramic powder and Fe particles are embedded in the carbon layer. Then, cool naturally to room temperature and collect the product to obtain carbon-coated nano-far-infrared ceramic iron-carrying composite material.

[0009] (4) Weigh out carbon-coated nano-far-infrared ceramic iron-carrying composite material and uniformly disperse it in 35 times its mass of methanol to form liquid A. Then weigh out 1.1-1.5 times its mass of 4-(2-hydroxyethoxy)benzoic acid of carbon-coated nano-far-infrared ceramic iron-carrying composite material and disperse it in 35 times its mass of methanol to form liquid B. Then slowly add liquid A to liquid B, sonicate for 10-30 min, and then stir the reaction for 12-48 h to allow Fe particles to self-assemble with 4-(2-hydroxyethoxy)benzoic acid to generate Fe-MOF. Then centrifuge to separate the solid particles obtained by centrifugation, redisperse them in methanol to wash away excess unreacted ligands, centrifuge again, collect the precipitate, and vacuum dry to obtain carbon-coated nano-far-infrared ceramic composite material.

[0010] Nano-far-infrared ceramic powder can radiate more far-infrared rays than normal objects. When far-infrared rays act on the skin, most of the energy is absorbed by the skin and converted into heat energy, causing the skin temperature to rise. This stimulates the heat receptors in the skin, and through the thalamus reflex, it causes vasodilation and accelerates blood circulation. As a result, the molecules of the organism can be excited and put into a higher vibrational state, activating the activity of biological macromolecules such as nucleic acids and proteins. In turn, the biological macromolecules play a role in regulating the body's metabolism, immunity and other activities, which is conducive to the recovery and balance of functions, and achieves the purpose of preventing and treating diseases and promoting and improving blood circulation.

[0011] Polydopamine (PDA) is a low-toxicity, highly surface-adsorbent, and biodegradable polymer. Converting PDA into a carbon structure at high temperatures avoids its physiological toxicity to the skin. Nano-Fe particles have a large specific surface area and high chemical reactivity, making them more likely to be absorbed by the human body, leading to more chemical and biological reactions and increasing the risk of genotoxicity. By embedding Fe particles within a carbon layer and using Fe as a metal source to self-assemble with organic ligands to form Fe-MOF, direct contact between nano-Fe particles and the human body can be avoided, effectively preventing the risk of genotoxicity from nano-Fe particles.

[0012] The carbon-coated far-infrared ceramic composite material prepared by the above method involves coating the surface of the far-infrared ceramic powder with a carbon structure and loading a metal element material (MOF) onto the carbon structure. This avoids direct contact between the far-infrared ceramic powder and the human body, preventing it from adhering to the skin surface or even penetrating into the pores. It also maintains a certain distance between the far-infrared ceramic powder and the skin, appropriately reducing the amount of far-infrared radiation absorbed by the skin. This prevents excessive skin overheating and discomfort caused by excessive energy absorption, thus reducing skin irritation. Simultaneously, the MOF material on the surface of the carbon-coated far-infrared ceramic composite material has high porosity and specific surface area, exhibiting very strong adsorption capacity and efficiency. It can adsorb oil and bacteria from the skin surface. When oil comes into contact with the MOF material, oil molecules enter the MOF pores and are adsorbed by weak interactions with the MOF surface. When bacteria come into contact with the MOF material, they are adsorbed onto the particle surface and killed. It can also adsorb macromolecules and metal ions from cosmetic residues. In addition, MOF can increase the viscosity and gel properties of facial cleansers, improving the user experience and effectiveness; MOF can also act as an antioxidant, helping skin cleansing and care products reduce the production of free radicals, thereby reducing skin damage.

[0013] Furthermore, before adding the far-infrared nanoparticles to the buffer solution in step (2), the far-infrared nanoparticles are first surface modified. The method is as follows: Weigh the coupling agent and dissolve it in a mixed solution of ethanol and water with a volume ratio of 1:1 to prepare a dilute solution with a mass fraction of 0.5-1%. Disperse it ultrasonically for 10-20 minutes, adjust the pH to 5-6 with oxalic acid, and after stirring and stabilizing, add the far-infrared nanoparticles to the mixed solution at a ratio of 500 mL / g. Disperse it ultrasonically for 10-30 minutes, and then stir it in a 70℃ water bath for 30-60 minutes. After centrifugation, drying, and grinding, the surface-modified far-infrared nanoparticles are obtained. Surface modification can improve the rheological and curing properties of the far-infrared nanoparticles, improve the dispersibility of the far-infrared nanoparticles in the buffer solution, and enable them to come into more complete contact with dopamine. This allows dopamine to undergo in-situ polymerization on the surface of the far-infrared nanoparticles to generate polydopamine, achieving the purpose of completely coating the far-infrared nanoparticles and reducing the exposure of the far-infrared nanoparticles.

[0014] Furthermore, the conditions for ultrasound assistance in step (2) are: ultrasound power 150-300W, frequency 40-60kHz, and temperature 30-50℃.

[0015] Furthermore, the centrifugation separation method in step (2) is as follows: first, centrifuge at 2000 rpm for 5-10 min to remove larger impurities, take the supernatant, then centrifuge the supernatant at 8000 rpm for 15-30 min, take the precipitate, and finally obtain uniformly sized polydopamine-coated nano-far-infrared ceramic iron-carrying particles.

[0016] Furthermore, the drying temperature in the blower drying oven in step (2) is 50-70℃, and the drying time is 12-48h.

[0017] Furthermore, the conditions for ultrasonic treatment in step (4) are: ultrasonic power 100-150W, frequency 20-40kHz, and temperature 50-80℃.

[0018] Furthermore, the temperature of the stirring reaction in step (4) is 80-100℃.

[0019] Furthermore, the vacuum drying conditions in step (4) are: drying temperature 60-80℃, vacuum degree 0.09-0.1MPa, and drying time 8-12h.

[0020] Furthermore, this invention also provides an application of carbon-coated nano-far-infrared ceramic composite material in skin cleansing and care products. By adding the carbon-coated nano-far-infrared ceramic composite material of this invention to skin cleansing and care products such as facial cleansers, shampoos, shower gels, facial masks, and skin creams, it can not only improve the skin's cleansing ability and effectively disinfect bacteria on the skin surface, but also promote and improve blood circulation, activate the activity of biological macromolecules such as nucleic acids and proteins, and thus exert the function of biological macromolecules in regulating the body's metabolism and immune activities, which is beneficial to the recovery and balance of skin function.

[0021] The beneficial effects of this invention are:

[0022] 1. This invention utilizes the far-infrared rays radiated by nano far-infrared ceramic powder, which can stimulate the heat receptors in the skin, causing vasodilation and accelerated blood circulation. This allows the molecules of the organism to be excited and put into a higher vibrational state, activating the activity of biological macromolecules such as nucleic acids and proteins. In turn, the biological macromolecules play a role in regulating the body's metabolism, immunity and other activities, which is beneficial to the recovery and balance of skin function and promotes and improves skin blood circulation.

[0023] 2. This invention, by coating a carbon structure on the surface of the nano-far-infrared ceramic powder and loading MOF on the surface of the carbon structure, can avoid direct contact between the nano-far-infrared ceramic powder and the human body, preventing it from adhering to the skin surface or even penetrating into the skin pores. It can also maintain a certain distance between the nano-far-infrared ceramic powder and the human skin, thereby appropriately reducing the amount of far-infrared radiation emitted by the nano-far-infrared ceramic powder absorbed by the skin, preventing excessive skin absorption and resulting in discomfort caused by excessive skin temperature rise, and reducing skin irritation.

[0024] 3. This invention improves the adsorption capacity and efficiency of the composite material by loading MOF onto the surface of carbon-coated nano-far-infrared ceramic composite material. It can adsorb oil, bacteria and cosmetic residues on the skin surface, thereby improving the skin's cleansing ability and the ability to disinfect bacteria on the skin surface.

[0025] 4. This invention increases the viscosity and gel properties of skin cleansing and care products by loading MOF onto the surface of carbon-coated nano-far-infrared ceramic composite material, thereby improving the user experience and effectiveness of skin cleansing and care products; moreover, MOF can also act as an antioxidant, helping skin cleansing and care products reduce the generation of free radicals and reduce skin damage. Detailed Implementation

[0026] The present invention will be described in detail below with reference to the embodiments:

[0027] Example 1

[0028] A carbon-coated nano-far-infrared ceramic composite material is prepared by the following method:

[0029] (1) Prepare a 0.1 mol / L aqueous solution of tris(hydroxymethyl)aminomethane, adjust its pH to 8 with hydrochloric acid, and use it as a buffer solution.

[0030] (2) Weigh 160g of coupling agent and dissolve it in 15L of a mixed solution of ethanol and water with a volume ratio of 1:1 to prepare a dilute solution. Disperse it ultrasonically for 10min, adjust the pH to 5 with oxalic acid, and after stirring until stable, add 30g of nano far-infrared ceramic powder, disperse it ultrasonically for 10min, and then stir it in a 70℃ water bath for 30min. After centrifugation, drying and grinding, the surface-modified nano far-infrared ceramic powder is obtained.

[0031] (3) Weigh 30g of surface-modified nano far-infrared ceramic powder and add it to 15L of buffer solution. Under the ultrasonic assistance of 150W power and 40kHz frequency, stir at 30℃ for 30min to obtain a uniformly dispersed suspension. Then add 60g of dopamine hydrochloride and 30g of ferric chloride hexahydrate and stir for 8h to allow dopamine to undergo in-situ polymerization on the surface of the nano far-infrared ceramic powder to generate polydopamine, which encapsulates the nano far-infrared ceramic powder and embeds Fe particles in the polydopamine. Then centrifuge at 2000rpm for 5min to remove larger impurities. Take the supernatant and centrifuge it at 8000rpm for 15min. Wash the precipitate with water and ethanol respectively, and then dry it in a 50℃ drying oven for 12h to obtain polydopamine-coated nano far-infrared ceramic iron-carrying particles.

[0032] (4) The polydopamine-coated nano-far-infrared ceramic iron-carrying particles were transferred to a tube furnace and heated to 750°C at a heating rate of 5°C / min under an argon atmosphere. The temperature was held for 2 hours to allow the polydopamine to fully carbonize and decompose, exposing more iron particles and forming a composite material in which polydopamine carbon is coated on the surface of the nano-far-infrared ceramic powder and Fe particles are embedded in the carbon layer. The product was then naturally cooled to room temperature and collected to obtain the carbon-coated nano-far-infrared ceramic iron-carrying composite material.

[0033] (5) Weigh 30g of carbon-coated nano-far-infrared ceramic iron-carrying composite material and uniformly disperse it in 1050g of methanol to form solution A. Then weigh 33g of 4-(2-hydroxyethoxy)benzoic acid and disperse it in 1155g of methanol to form solution B. Then slowly add solution A to solution B and treat it in an ultrasonic bath at 100W power and 20kHz frequency for 10min. After treatment at 50℃, stir the reaction at 80℃ for 12h to allow Fe particles to self-assemble with 4-(2-hydroxyethoxy)benzoic acid to generate Fe-MOF. Then centrifuge the solid particles obtained by centrifugation, redisperse them in methanol to wash away excess unreacted ligands, centrifuge again, collect the precipitate, and dry it under vacuum conditions of 0.09MPa and 60℃ for 8h to obtain carbon-coated nano-far-infrared ceramic composite material.

[0034] Example 2

[0035] A carbon-coated nano-far-infrared ceramic composite material is prepared by the following method:

[0036] (1) Prepare a 0.1 mol / L aqueous solution of tris(hydroxymethyl)aminomethane, adjust its pH to 8.5 with hydrochloric acid, and use it as a buffer solution.

[0037] (2) Weigh 170g of coupling agent and dissolve it in 15L of a 1:1 mixture of ethanol and water to prepare a dilute solution. Disperse the solution by sonication for 15min, adjust the pH to 5.5 with oxalic acid, and after stirring until stable, add 30g of nano far-infrared ceramic powder and disperse by sonication for 20min. Then stir in a 70℃ water bath for 50min. After centrifugation, drying and grinding, the surface-modified nano far-infrared ceramic powder is obtained.

[0038] (3) Weigh 30g of surface-modified nano far-infrared ceramic powder and add it to 24L of buffer solution. Under the ultrasonic assistance of 200W power and 50kHz frequency, stir at 40℃ for 90min to obtain a uniformly dispersed suspension. Then add 60g of dopamine hydrochloride and 45g of ferric chloride hexahydrate and stir for 12h to allow dopamine to undergo in-situ polymerization on the surface of the nano far-infrared ceramic powder to generate polydopamine, which encapsulates the nano far-infrared ceramic powder and embeds Fe particles in the polydopamine. Then centrifuge at 2000rpm for 8min to remove larger impurities. Take the supernatant and centrifuge at 8000rpm for 20min. Wash the precipitate with water and ethanol respectively, and then dry it in a 60℃ drying oven for 24h to obtain polydopamine-coated nano far-infrared ceramic iron-carrying particles.

[0039] (4) The polydopamine-coated nano-far-infrared ceramic iron-carrying particles were transferred to a tube furnace and heated to 800°C at a heating rate of 5°C / min under an argon atmosphere. The temperature was held for 4 hours to allow the polydopamine to fully carbonize and decompose, exposing more iron particles and forming a composite material in which polydopamine carbon is coated on the surface of the nano-far-infrared ceramic powder and Fe particles are embedded in the carbon layer. The product was then naturally cooled to room temperature and collected to obtain the carbon-coated nano-far-infrared ceramic iron-carrying composite material.

[0040] (5) Weigh 30g of carbon-coated nano-far-infrared ceramic iron-carrying composite material and uniformly disperse it in 1050g of methanol to form solution A. Weigh 39g of 4-(2-hydroxyethoxy)benzoic acid and disperse it in 1365g of methanol to form solution B. Then slowly add solution A to solution B and treat it in an ultrasonic bath at 120W power and 30kHz frequency for 20min. After treatment at 60℃, stir the reaction at 90℃ for 24h to allow Fe particles to self-assemble with 4-(2-hydroxyethoxy)benzoic acid to generate Fe-MOF. Then centrifuge the solid particles and redisperse them in methanol to wash away excess unreacted ligands. Centrifuge again, collect the precipitate, and dry it under vacuum conditions of 0.095MPa and 70℃ for 9h to obtain carbon-coated nano-far-infrared ceramic composite material.

[0041] Example 3

[0042] A carbon-coated nano-far-infrared ceramic composite material is prepared by the following method:

[0043] (1) Prepare a 0.1 mol / L aqueous solution of tris(hydroxymethyl)aminomethane, adjust its pH to 9 with hydrochloric acid, and use it as a buffer solution.

[0044] (2) Weigh 175g of coupling agent and dissolve it in 15L of a mixed solution of ethanol and water with a volume ratio of 1:1 to prepare a dilute solution. Disperse it ultrasonically for 20min, adjust the pH to 6 with oxalic acid, and after stirring until stable, add 30g of nano far-infrared ceramic powder, disperse it ultrasonically for 30min, and then stir it in a 70℃ water bath for 60min. After centrifugation, drying and grinding, the surface-modified nano far-infrared ceramic powder is obtained.

[0045] (3) Weigh 30g of surface-modified nano far-infrared ceramic powder and add it to 30L of buffer solution. Under the ultrasonic assistance of 300W power and 60kHz frequency, stir at 50℃ for 120min to obtain a uniformly dispersed suspension. Then add 60g of dopamine hydrochloride and 60g of ferric chloride hexahydrate and stir for 24h to allow dopamine to undergo in-situ polymerization on the surface of the nano far-infrared ceramic powder to generate polydopamine, which encapsulates the nano far-infrared ceramic powder and embeds Fe particles in the polydopamine. Then centrifuge at 2000rpm for 10min to remove larger impurities. Take the supernatant and centrifuge it at 8000rpm for 30min. Wash the precipitate with water and ethanol respectively, and then dry it in a 70℃ drying oven for 48h to obtain polydopamine-coated nano far-infrared ceramic iron-carrying particles.

[0046] (4) The polydopamine-coated nano-far-infrared ceramic iron-carrying particles were transferred to a tube furnace and heated to 850°C at a heating rate of 5°C / min under an argon atmosphere. The temperature was held for 5 hours to allow the polydopamine to fully carbonize and decompose, exposing more iron particles and forming a composite material in which polydopamine carbon is coated on the surface of the nano-far-infrared ceramic powder and Fe particles are embedded in the carbon layer. The product was then naturally cooled to room temperature and collected to obtain the carbon-coated nano-far-infrared ceramic iron-carrying composite material.

[0047] (5) Weigh 30g of carbon-coated nano-far-infrared ceramic iron-carrying composite material and uniformly disperse it in 1050g of methanol to form solution A. Weigh 45g of 4-(2-hydroxyethoxy)benzoic acid and disperse it in 1575g of methanol to form solution B. Then slowly add solution A to solution B and treat it in an ultrasonic bath at 150W power and 40kHz frequency for 30min. After treatment at 80℃, stir the reaction at 100℃ for 48h to allow Fe particles to self-assemble with 4-(2-hydroxyethoxy)benzoic acid to generate Fe-MOF. Then centrifuge the solid particles obtained by centrifugation, redisperse them in methanol to wash away excess unreacted ligands, centrifuge again, collect the precipitate, and dry it under vacuum conditions of 0.1MPa and 80℃ for 12h to obtain carbon-coated nano-far-infrared ceramic composite material.

[0048] Example 4

[0049] A facial cleanser, the preparation method of which is as follows:

[0050] (1) Weigh 7.5g of sodium carboxymethyl cellulose and dissolve it in 96g of glycerol, then add 350g of deionized water to make it swell;

[0051] (2) Weigh 350g of deionized water, add 30g of sodium dodecyl alcohol ether sulfate, 10g of lauroyl diethanolamide and 10g of amine oxide respectively, and stir evenly;

[0052] (3) Place the contents obtained in steps (1) and (2) into the mixing tank of a homogenizing emulsifier, heat it to 60°C under stirring conditions, add 8.5g of hydrophilic lanolin and 15g of stearic acid respectively, and stir evenly; then cool it down to 40°C, add 14g of hyaluronic acid, and stir evenly.

[0053] (4) Continue to add 300g of carbon-coated nano far-infrared ceramic composite material prepared according to the method of Example 1 and 0.1g of fragrance. Turn on the shear stirring function of the homogenizer emulsifier, set the shear force to 1200rpm and the stirring time to 20min, so that the sodium chloride can be fully dissolved under strong shear force and achieve emulsification and homogenization.

[0054] (5) Adjust the pH value to 7.5;

[0055] (6) The product obtained in step (5) is transferred to the finished product container and left to stand for 24 hours to obtain the facial cleanser.

[0056] Example 5

[0057] This embodiment repeats the steps of embodiment 4, the only difference being that the carbon-coated nano far-infrared ceramic composite material added in step (4) is the carbon-coated nano far-infrared ceramic composite material prepared according to the method of embodiment 2.

[0058] Example 6

[0059] This embodiment repeats the steps of embodiment 4, the only difference being that the carbon-coated nano far-infrared ceramic composite material added in step (4) is the carbon-coated nano far-infrared ceramic composite material prepared according to the method of embodiment 3.

[0060] Example 7

[0061] This embodiment repeats the steps of embodiment 4, the only difference being that carbon-coated nano-far-infrared ceramic composite material is not added in step (4).

[0062] Example 8

[0063] A moisturizing cream, the preparation method of which is as follows:

[0064] Weigh out 100g of medical petroleum jelly and 5g of carbon-coated nano-far-infrared ceramic composite material prepared according to the preparation method in Example 1, mix them evenly to obtain a moisturizing cream.

[0065] Example 9

[0066] A moisturizing cream, the preparation method of which is as follows:

[0067] Weigh out 100g of medical petroleum jelly and 5g of carbon-coated nano-far-infrared ceramic composite material prepared according to the preparation method in Example 2, mix them evenly, and you will get a moisturizing cream.

[0068] Example 10

[0069] A moisturizing cream, the preparation method of which is as follows:

[0070] Weigh out 100g of medical petroleum jelly and 5g of carbon-coated nano-far-infrared ceramic composite material prepared according to the preparation method in Example 3, mix them evenly, and you will get a moisturizing cream.

[0071] Antibacterial performance test:

[0072] The carbon-coated nano-far-infrared ceramic composite materials prepared in Examples 1-3 were dispersed in suspensions composed of Propionibacterium acnes, Staphylococcus aureus, Enterococcus, and Gram-positive bacilli, respectively, and designated as Experimental Group 1, Experimental Group 2, and Experimental Group 3. A suspension composed of Propionibacterium acnes, Staphylococcus aureus, Enterococcus, and Gram-positive bacilli without any added components was designated as the blank group. Experimental Groups 1-3 and the blank group were then irradiated with 15W fluorescent light for 30 minutes, followed by incubation at 37°C for 24 hours. Colony counts were then performed using a colony counter to calculate the inhibition rate of each material against Propionibacterium acnes, Staphylococcus aureus, Enterococcus, and Gram-positive bacilli under fluorescent light irradiation. The inhibition rate was calculated as follows: (N...) SC -N S ) / N SC ×100% (where N is the formula) SC N represents the colony count of the blank control group without any added components. S The colony counts of the experimental groups containing the corresponding carbon-coated nano-far-infrared ceramic composite materials were measured, and the test results are shown in Table 1.

[0073] Table 1. Results of antibacterial performance test

[0074]

[0075] As can be seen from the test data in Table 1, the carbon-coated nano-far-infrared ceramic composite materials prepared in Examples 1-3 all exhibited inhibition rates of over 99.5% against Propionibacterium acnes, Staphylococcus aureus, Enterococcus, and Gram-positive bacilli. Therefore, the carbon-coated nano-far-infrared ceramic composite materials prepared in this invention possess excellent antibacterial properties and can effectively eliminate bacteria on the skin surface.

[0076] Skin irritation test:

[0077] Forty mice were used. A 2×2cm section of fur was removed from the back of each mouse. A circular area with a diameter of 10mm was measured and marked on each mouse. The skin was disinfected with cotton wool, then lifted with tweezers and surgical scissors were used to cut away the skin along the marked lines, creating a full-thickness circular wound with a diameter of 10mm. The mice were then divided into four groups and numbered at the base of their tails: three experimental groups (Experimental Group 1, Experimental Group 2, and Experimental Group 3) and one control group. Experimental Groups 1, 2, and 3 were each uniformly coated with equal amounts of the moisturizing creams prepared in Examples 8, 9, and 10, respectively. The control group was uniformly coated with pure medical petroleum jelly. The day the incision was made was designated as day 0. The medication was administered the following day (day 1). The mice's mental state and wound condition after applying the cleanser were observed daily. The average scarring time (h) and complete wound healing time (d) were recorded. The test results are shown in Table 2.

[0078] Table 2 Results of Skin Irritation Tests

[0079]

[0080] As shown in Table 2, the mice treated with the moisturizing cream prepared in Examples 8 to 10 showed better activity levels and no adverse reactions compared to mice with untreated wounds. The mice treated with the moisturizing cream prepared in Examples 8 to 10 had no tissue fluid leakage or redness / swelling. While the control group mice treated with pure medical petroleum jelly also showed good activity and no adverse reactions, their wounds had a small amount of tissue fluid leakage and mild redness / swelling. Furthermore, the average scarring time for the wounds treated with the moisturizing cream prepared in Examples 8 to 10 was within 15 hours, and the complete healing time was approximately 5 days, which was more than half the average scarring and complete healing time compared to the mice treated with pure medical petroleum jelly. Therefore, it can be seen that the carbon-coated nano-far-infrared ceramic composite material of the present invention has low irritation. Even when it comes into contact with a wound, it will not cause tissue fluid to flow out due to irritation, and it can also promote wound healing. The main reason is that the carbon-coated nano-far-infrared ceramic composite material of the present invention can promote and improve blood circulation, enhance the recovery and balance of skin function, and therefore can be used on human skin.

[0081] Facial cleanser product performance test:

[0082] The facial cleansers prepared in Examples 4-7 were used to test the performance of each product.

[0083] pH value test: pH value is measured by direct measurement method, that is, the pH value is measured by placing the pH meter electrode into the undiluted sample at 25℃.

[0084] Viscosity test: Viscosity was measured using the test method described in GB / T15357-2014 at a rotation speed of 20 rpm.

[0085] -15℃ / 25℃ (3 cycles) test: The sample was placed in a -15℃ freezer for 24 hours, then removed and kept at 25℃ for 25 hours, constituting one cycle. This cycle was repeated 3 times for observation and testing. The test results are shown in Table 3.

[0086] Table 3 Performance test results of facial cleanser products

[0087]

[0088] In Table 3: O represents good stability; X represents sample delamination and / or roughening of appearance.

[0089] Analysis of the experimental results in Table 3 shows that the pH values ​​of the facial cleansers prepared in Examples 8 to 10 are all around 7. However, the addition of the carbon-coated nano-far-infrared ceramic composite material of the present invention in Examples 8 to 9 slightly increased the pH value of the system, indicating that the carbon-coated nano-far-infrared ceramic composite material can reduce the acidity of the facial cleanser and has a certain effect on reducing skin damage. The viscosity of the facial cleansers prepared in Examples 8 to 9 is above 45,000 MPa, while the viscosity of the facial cleanser in Example 10 is 19,300 MPa. This indicates that the addition of the carbon-coated nano-far-infrared ceramic composite material of the present invention significantly increases the viscosity of the system. This is because the MOF in the carbon-coated nano-far-infrared ceramic composite material can interact with other components in the facial cleanser, increasing the interaction forces between them, thereby increasing the viscosity of the facial cleanser. At the same time, the MOF has a large number of porous structures, which can effectively adsorb water, thereby reducing the water content in the facial cleanser, increasing the viscosity and gel properties of the facial cleanser, and improving the user experience and effect of the facial cleanser.

[0090] The high and low temperature performance test results show that the facial cleansers in Examples 8 and 9, which incorporate the carbon-coated nano-far-infrared ceramic composite material of the present invention, exhibit excellent stability. However, the facial cleanser in Example 10, which does not contain the carbon-coated nano-far-infrared ceramic composite material of the present invention, showed stratification under high and low temperatures and under alternating cycling conditions. This is because the MOF in the carbon-coated nano-far-infrared ceramic composite material has strong chemical inertness and thermal stability, which enhances the physical and chemical stability of the facial cleanser, preventing deterioration, decomposition, and gelatinization during storage and use, thus extending the product's lifespan. Therefore, the carbon-coated nano-far-infrared ceramic composite material of the present invention can improve the user experience and effectiveness of facial cleansers, as well as the stability of skin cleansing and care products.

[0091] Cleanser product efficacy test:

[0092] Sixty women aged 20-40 with dull, yellowish facial skin, prone to acne, and sensitive skin were selected as participants. They were randomly divided into four groups of 15 each. Three groups were experimental, and one group was a control group. The experimental groups used the facial cleansers prepared according to the formulas in Examples 4-6 of this invention; the control group used the facial cleansers prepared according to Example 7 of this invention. Each participant washed their face twice a day, once in the morning and once in the evening. There was no significant difference in the amount of facial cleanser used each time. One month was considered one course of treatment.

[0093] The method of use is as follows: (1) Wet your face with water; (2) Take a pea-sized amount of the cleanser in your palm, gently rub it to create foam, apply it to your face, and gently massage your face for 1 minute; (3) Rinse the foam off your skin with water.

[0094] Test participants rated the sample based on their own sensations, using a 10-point scale, with 1 being the worst and 10 the best. Additionally, participants evaluated the mild irritation of the test sample, including the presence or absence of irritation, itching, and redness around the eyes. The test results are shown in Table 4.

[0095] Table 4 Results of the test on the effectiveness of facial cleanser products

[0096] Skin comfort 8.5 8.5 8.4 9.7 Cleaning effect 9.7 9.8 9.8 7.2 Moisturizing effect 9.4 9.6 9.5 7.1 rich foam 9.6 9.8 9.7 6.9 Stimulation slight slight slight none itching none none none none Redness around the eyes none none none none

[0097] Analysis of the experimental results in Table 4 shows that, firstly, the facial cleansers in Examples 4 to 6, which incorporated the carbon-coated nano-far-infrared ceramic composite material of the present invention, all scored above 9.4 points in terms of cleansing effect, moisturizing effect, and foam richness. In contrast, the facial cleanser in Example 7, which did not incorporate the carbon-coated nano-far-infrared ceramic composite material of the present invention, scored only around 7 points in these three aspects. This is mainly because the MOF in the carbon-coated nano-far-infrared ceramic composite material of the present invention has a highly ordered pore structure that provides numerous sites for gas molecule adsorption, thereby enhancing the foam stability of the facial cleanser. Simultaneously, the MOF also has high surface energy, allowing it to effectively interact with water molecules, promoting the dispersion and dissolution of the facial cleanser, further enhancing the foaming effect, and enabling the effective ingredients of the facial cleanser to more evenly contact the skin, fully covering the skin surface, improving cleansing ability, and also providing more thorough lubrication and effective moisturization. Therefore, the addition of the carbon-coated nano-far-infrared ceramic composite material can significantly improve the foaming performance of the facial cleanser, making it easier to form uniform, delicate, and rich foam that lasts longer, thus enhancing the cleansing and moisturizing effects of the facial cleanser.

[0098] Secondly, the skin comfort scores of the facial cleansers containing the carbon-coated nano-far-infrared ceramic composite material of the present invention in Examples 4 to 6 were all around 8.5 points, with a slight irritation. In contrast, the skin comfort score of the facial cleanser in Example 7, which did not contain the carbon-coated nano-far-infrared ceramic composite material of the present invention, reached 9.7 points, with no irritation. This is mainly because the far-infrared rays radiated by the nano-far-infrared ceramic powder in the carbon-coated nano-far-infrared ceramic composite material of the present invention are absorbed by the skin, stimulating the skin's thermal receptors and causing a slight irritation, thus slightly reducing skin comfort. However, the slight stimulation of far-infrared rays can dilate blood vessels and accelerate blood circulation, thereby exciting the molecules of the organism to a higher vibrational state, activating the activity of biological macromolecules such as nucleic acids and proteins, and thus exerting the function of biological macromolecules in regulating the body's metabolism and immune activities. This is beneficial for the recovery and balance of functions, promotes and improves blood circulation, and has a very beneficial effect on the skin. It is not a side effect of stimulation, and the irritation and comfort of the skin are completely within an acceptable range.

[0099] Finally, none of the facial cleansers prepared in Examples 4 to 7 showed any itching or redness around the eyes, indicating that the carbon-coated nano-far-infrared ceramic composite material of the present invention has no toxic side effects on the skin.

[0100] In summary, the addition of the carbon-coated nano-far-infrared ceramic composite material of the present invention has virtually no negative impact on the performance of skin cleansing and care products. In fact, it improves the bactericidal function, cleansing effect, moisturizing effect, and foam richness of the facial cleanser, and also gives the facial cleanser a soothing and repairing effect. It can very effectively improve the quality of facial cleansers and is worthy of promotion and application.

[0101] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention. Technologies not described in detail in this invention are known technologies.

Claims

1. A method for preparing a carbon-coated nano-far-infrared ceramic composite material, characterized in that, The preparation method includes the following steps: (1) Prepare a 0.1 mol / L aqueous solution of tris(hydroxymethyl)aminomethane and adjust its pH to 8-9 with hydrochloric acid as a buffer solution for later use; (2) Add nano far-infrared ceramic powder to the buffer solution at a ratio of 500-1000 mL / g, and stir under ultrasonic assistance for 30-120 min to obtain a uniformly dispersed suspension. Then add 2 times the mass of nano far-infrared ceramic powder, dopamine hydrochloride and 1-2 times the mass of ferric chloride hexahydrate, stir and react for 8-24 h, then centrifuge to separate, wash the precipitate with water and ethanol respectively, and then dry it in a forced-air drying oven to obtain polydopamine-coated nano far-infrared ceramic iron-carrying particles. (3) Transfer polydopamine-coated nano-far-infrared ceramic iron-carrying particles to a tube furnace, and heat them to 750-850℃ at a heating rate of 5℃ / min under an argon atmosphere. Hold the temperature for 2-5 hours, and then cool them naturally to room temperature. Collect the product to obtain carbon-coated nano-far-infrared ceramic iron-carrying composite material. (4) Weigh out carbon-coated nano far-infrared ceramic iron-carrying composite material and uniformly disperse it in 35 times the mass of methanol to form liquid A. Weigh out 1.1-1.5 times the mass of 4-(2-hydroxyethoxy)benzoic acid of carbon-coated nano far-infrared ceramic iron-carrying composite material and disperse it in 35 times the mass of methanol to form liquid B. Then slowly add liquid A to liquid B, sonicate for 10-30 min, stir and react for 12-48 h, then centrifuge and separate. Redisperse the solid particles obtained by centrifugation in methanol, wash, centrifuge again, collect the precipitate, and vacuum dry to obtain carbon-coated nano far-infrared ceramic composite material. Before adding the buffer solution, the nano-far-infrared ceramic powder mentioned in step (2) is first surface modified. The method is as follows: Weigh the coupling agent and dissolve it in a mixed solution of ethanol and water with a volume ratio of 1:1 to prepare a dilute solution with a mass fraction of 0.5-1%. Disperse it ultrasonically for 10-20 minutes, adjust the pH to 5-6 with oxalic acid, and after stirring and stabilizing, add the nano-far-infrared ceramic powder to the mixed solution at a ratio of 500 mL / g. Disperse it ultrasonically for 10-30 minutes, and then stir it in a water bath at 70℃ for 30-60 minutes. After centrifugation, drying and grinding, the surface-modified nano-far-infrared ceramic powder is obtained.

2. The preparation method according to claim 1, characterized in that, The conditions for ultrasound assistance in step (2) are: ultrasound power 150-300W, frequency 40-60kHz, and temperature 30-50℃.

3. The preparation method according to claim 2, characterized in that, The centrifugation method described in step (2) is as follows: first centrifuge at 2000 rpm for 5-10 min, take the supernatant, and then centrifuge the supernatant at 8000 rpm for 15-30 min.

4. The preparation method according to claim 3, characterized in that, The drying temperature in the blower drying oven described in step (2) is 50-70℃, and the drying time is 12-48h.

5. The preparation method according to claim 4, characterized in that, The conditions for ultrasonic treatment in step (4) are: ultrasonic power 100-150W, frequency 20-40kHz, and temperature 50-80℃.

6. The preparation method according to claim 5, characterized in that, The temperature of the stirring reaction in step (4) is 80-100℃.

7. The preparation method according to claim 6, characterized in that, The vacuum drying conditions described in step (4) are: drying temperature 60-80℃, vacuum degree 0.09-0.1MPa, and drying time 8-12h.

8. The carbon-coated nano-far-infrared ceramic composite material prepared by the preparation method according to any one of claims 1-7.

9. The application of the carbon-coated nano-far-infrared ceramic composite material as described in claim 8 in the preparation of skin cleansing and care products.

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