Modified cosmetic material and cosmetic

Abstract

The invention relates to the technical field of cosmetic material preparation, in particular to a modified cosmetic material and a cosmetic. Bamboo charcoal is selected as a base material, tea polyphenol is attached to the surface of the bamboo charcoal and in micropores in the bamboo charcoal by means of porosity and adsorbability of the bamboo charcoal, chitosan forms a film on the surface of the bamboo charcoal to cover the surface of the bamboo charcoal by means of the cross-linking effect between the chitosan and a cross-linking agent, and the film structure can protect the bamboo charcoal and the tea polyphenol in the bamboo charcoal from being in contact with the outside. Oxidation of tea polyphenols is avoided, cosmetics still have a long effective storage life after packaging is opened, bamboo charcoal which becomes a film is added into vegetable oil and water, then an emulsifying agent is added, paste or emulsion is formed, cosmetic materials can be conveniently stored and utilized, and the method can be widely applied to the technical field of cosmetic material preparation.

Description

Technical Field

[0001] The present invention relates to the technical field of cosmetic material preparation, in particular to a modified cosmetic material and cosmetics. Background Art

[0002] Tea polyphenols is the general term for polyphenol compounds in tea leaves, accounting for 20% to 35% of the dry weight of tea leaves, mainly including 6 types of compounds: flavanones, anthocyanidins, flavonols and anthocyanidins, phenolic acid and deoxyphenolic acid. Among them, flavanones (mainly catechin compounds) are the most important, accounting for 60% to 80% of the total tea polyphenols.

[0003] In cosmetics, tea polyphenols are widely used as functional additives, which have the effects of anti-skin aging, anti-inflammatory and sterilization, promoting skin microcirculation, sunscreen and spot removal, etc. However, tea polyphenols are easily oxidized after contacting oxygen in the air; if tea polyphenols are directly added to cosmetics, the cosmetics in the package will frequently contact with the air after the cosmetics package is opened, and the tea polyphenols in the cosmetics will oxidize in contact with the air, which will lead to a decline in the performance of the cosmetics product and shorten the effective use period of the cosmetics after the package is opened. Summary of the invention

[0004] The object of the present invention is to provide a modified cosmetic material and cosmetics to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a modified cosmetic material and cosmetics, wherein the preparation of the modified cosmetic material comprises the following steps:

[0006] The components used in the following steps are all measured by weight fraction;

[0007] 1. A modified cosmetic material comprising the following synthesis steps: In parts by weight, the following synthesis steps are included:

[0008] Dissolve 3-4 parts of tea polyphenols in 100-110 parts of water to obtain a tea polyphenol solution;

[0009] Add 7-12 parts of bamboo charcoal to the tea polyphenol solution and let it stand for 4 hours to allow the tea polyphenol to be adsorbed onto the bamboo charcoal;

[0010] Adding 2 parts of chitosan and 2 parts of a cross-linking agent into the tea polyphenol solution, and forming a film of chitosan on the surface of the bamboo charcoal through the cross-linking effect between the chitosan and the cross-linking agent, thereby obtaining a bamboo charcoal with a surface film;

[0011] 8-10 parts of bamboo charcoal with a surface film and 1 part of salicylic acid are added to 10-12 parts of vegetable oil, and then an emulsifier and 100 parts of deionized water are added, and the mixture is stirred and mixed to obtain a cosmetic material.

[0012] Bamboo charcoal is selected as the basic material, and its porosity and adsorption are utilized to make tea polyphenols adhere to the surface of bamboo charcoal and the micropores inside bamboo charcoal. The cross-linking effect between chitosan and the cross-linking agent is utilized to make chitosan form a film on the surface of bamboo charcoal. This film structure can protect the bamboo charcoal and tea polyphenols inside from contact with the outside world, avoid the oxidation of tea polyphenols, and make the cosmetics still have a long effective storage period after the package is opened.

[0013] The bamboo charcoal that has been transformed into a film is added into vegetable oil and water, and then an emulsifier is added to form a paste or emulsion, which is convenient for the storage and use of cosmetic materials.

[0014] Salicylic acid is slightly soluble in water, making the solution weakly acidic. When using cosmetic materials, add an appropriate amount of water to dissolve salicylic acid, thus forming an acidic aqueous solution environment, which in turn dissolves the membrane structure formed by chitosan in an acidic environment, thereby releasing tea polyphenols attached to bamboo charcoal. At the same time, salicylic acid can remove the stratum corneum on the surface of the skin, accelerate the entry of tea polyphenols into the skin pores, and enhance the applicability of tea polyphenols.

[0015] Preferably, before adding the tea polyphenol solution, the bamboo charcoal is modified with ethylenediaminetetraacetic acid, which comprises the following modification steps by weight:

[0016] S1. Add 20 parts of bamboo charcoal into 150-200 parts of deionized water, boil the deionized water, filter the deionized water while it is hot, and put the filtered bamboo charcoal into an oven to dry;

[0017] S2, dissolving 1 part of ethylenediaminetetraacetic acid in 160 parts of boiling water to obtain an ethylenediaminetetraacetic acid solution, adding 15 parts of the bamboo charcoal dried in the oven in S1 to the ethylenediaminetetraacetic acid solution, stirring the ethylenediaminetetraacetic acid solution for 10 minutes to make the bamboo charcoal mix evenly;

[0018] S3, stopping stirring, cooling the EDTA solution to 20° C., filtering the EDTA solution to obtain bamboo charcoal modified with EDTA.

[0019] Soluble impurities in bamboo charcoal can be removed by boiling deionized water and filtering.

[0020] Among them, EDTA, as a powerful chelating agent, can combine with certain metal ions on the surface of bamboo charcoal to prevent the metal ions in the bamboo charcoal from damaging the skin; and through the above combination, the adsorption capacity of bamboo charcoal is enhanced, so that bamboo charcoal can absorb more tea polyphenols.

[0021] Among them, tea polyphenols are more stable in a weak acid environment. Ethylenediaminetetraacetic acid is a weak acid. By adsorbing it on the surface of bamboo charcoal, the bamboo charcoal as a whole becomes weakly acidic, thereby enhancing the stability of tea polyphenols on the bamboo charcoal.

[0022] Preferably, the process of adsorbing tea polyphenols onto the surface of bamboo charcoal comprises the following steps:

[0023] S1. Dissolve 3-4 parts of tea polyphenols in 100-110 parts of warm water to obtain a tea polyphenol solution, wherein the temperature of the warm water is in the range of 75° C. to 85° C.;

[0024] S2, adding 7 to 12 parts of bamboo charcoal to the tea polyphenol solution, and stirring to fully mix the bamboo charcoal and the tea polyphenol solution, and keeping the temperature of the tea polyphenol solution unchanged during the mixing process;

[0025] S3, adding 2 parts of sodium chloride to the tea polyphenol solution, stirring the saturated tea polyphenol solution for 10 minutes to dissolve the sodium chloride, and keeping the temperature of the saturated tea polyphenol solution unchanged during the stirring process;

[0026] S4. Stop stirring, slowly cool the tea polyphenols solution to 20-25°C, and let it stand for 4 hours to allow the tea polyphenols to precipitate on the surface of the bamboo charcoal.

[0027] The tea polyphenols in the tea polyphenol solution are precipitated by cooling, wherein sodium chloride is added to the tea polyphenol solution, and the sodium chloride and tea polyphenols compete for solvent water, thereby increasing the precipitation amount of tea polyphenols.

[0028] Preferably, during the process of tea polyphenols being adsorbed on bamboo charcoal, after the tea polyphenol solution is cooled to 20-25°C, 1 part of sodium bicarbonate is first added to the tea polyphenol solution by weight to dissolve, and then allowed to stand for 4 hours to allow the tea polyphenols and sodium bicarbonate to precipitate on the surface of the bamboo charcoal.

[0029] Sodium bicarbonate is adsorbed onto bamboo charcoal. When the cosmetics are used, the cosmetics are dissolved in hot water. Sodium bicarbonate is decomposed by heat to produce gas, which then breaks through the chitosan film covering the surface of the bamboo charcoal, so that the tea polyphenols on the bamboo charcoal can be released as soon as possible. The solution of sodium bicarbonate is weakly alkaline, and the stability of tea polyphenols decreases in a weakly alkaline environment. The ethylenediaminetetraacetic acid adsorbed on the bamboo charcoal can adjust the pH environment in the bamboo charcoal to a certain extent, enhance the stability of tea polyphenols on the bamboo charcoal, and at the same time, ethylenediaminetetraacetic acid can accelerate the decomposition of sodium bicarbonate under elevated temperature conditions.

[0030] Preferably, the chitosan is degraded into low molecular weight chitosan using hydrogen peroxide before cross-linking.

[0031] When the molecular weight of chitosan is large, acid needs to be added to water to make the pH of the aqueous solution reach a certain range in order to dissolve the chitosan; if acid is added during the chitosan cross-linking process, sodium bicarbonate will react with the acid to decompose, causing the sodium bicarbonate to become ineffective. Moreover, after cross-linking, the solubility of chitosan with a large molecular weight is less affected by changes in the pH of the solution. When using cosmetics, its chitosan film is difficult to destroy, which is not conducive to the release of tea polyphenols when using cosmetics.

[0032] Therefore, before cross-linking, chitosan is degraded into small molecular chitosan by using hydrogen peroxide to improve the solubility of chitosan, so that it can be directly dissolved in water. No acid needs to be added during the cross-linking process, and a chitosan film is formed under the action of the cross-linking agent. After the small molecular chitosan is cross-linked into a film, its solubility is greatly affected by the change of solution pH, which is beneficial to the destruction of the chitosan film.

[0033] Preferably, the cross-linking agent is sodium alginate. 2 parts of low molecular weight chitosan and 2 parts of sodium alginate are added to the tea polyphenol solution by weight, mixed, allowed to stand for 3 to 5 hours, and filtered to obtain bamboo charcoal with a surface film.

[0034] High molecular weight chitosan cannot be directly dissolved in water, and needs to be added with acidic organic acids to make the water acidic before it can be dissolved; using high molecular weight chitosan to form a film will increase the difficulty of subsequent process treatment; low molecular weight chitosan can be directly dissolved in water, so chitosan, sodium alginate and bamboo charcoal can be directly blended to form a film. The film formed by sodium alginate as a cross-linking agent has better sealing properties.

[0035] As a preferred method, by weight, by weight, the surface film-forming bamboo charcoal and salicylic acid are added to the vegetable oil in the emulsification process as follows;

[0036] S1. Add salicylic acid to ethanol and dissolve it; after the salicylic acid is completely dissolved, slowly add deionized water to the ethanol until the salicylic acid precipitates to form fine particles, and filter to obtain salicylic acid particles.

[0037] S2. Add 1 part of salicylic acid particles and 8-10 parts of surface film-forming bamboo charcoal to 10-12 parts of vegetable oil solution, then add 100 parts of deionized water, and then add an emulsifier and stir for 3 hours to obtain a cosmetic material.

[0038] Salicylic acid has low solubility in both vegetable oil and water, and is difficult to mix evenly in vegetable oil and water. Therefore, salicylic acid is dissolved in ethanol, and then water is added to the ethanol, and water and salicylic acid compete for the ethanol solvent, so that salicylic acid is precipitated into fine particles. Then, the bamboo charcoal with a film on the surface and the fine particles of salicylic acid are added to the vegetable oil and water, and the mixture is fully mixed, and then an emulsifier is added to emulsify to obtain a relatively stable emulsion or paste; it is convenient to add cosmetic materials into cosmetics.

[0039] A cosmetic characterized by adding the modified cosmetic material according to any one of claims 1 to 7.

[0040] Compared with the prior art, the preparation method of the cosmetic material in the present invention has the following beneficial effects:

[0041] (1) By modifying bamboo charcoal with EDTA, the adsorption effect of bamboo charcoal is enhanced, so that it can absorb more tea polyphenols; secondly, EDTA, as a chelating agent, can combine with metal ions on the surface of bamboo charcoal to avoid the damage of metal ions in bamboo charcoal to the skin; tea polyphenols are more stable under acidic conditions. EDTA, as a weak acid, is adsorbed on the surface of bamboo charcoal and neutralizes the alkalinity of sodium bicarbonate to a certain extent, thereby improving the stability of tea polyphenols on the surface of bamboo charcoal.

[0042] (2) By forming a chitosan film on the surface of bamboo charcoal, the contact between the outside air and the tea polyphenols on the surface of bamboo charcoal is avoided after the cosmetics package is opened, thereby improving the stability of tea polyphenols in the cosmetics and extending the effective storage period of the cosmetics after the package is opened.

[0043] (3) The sodium bicarbonate attached to the bamboo charcoal can decompose in an environment above 50°C to produce carbon dioxide gas, which then breaks through the chitosan membrane and releases the tea polyphenols attached to the bamboo charcoal.

[0044] (4) Before chitosan cross-linking, high molecular weight chitosan is oxidized and degraded into low molecular weight chitosan by hydrogen peroxide, so that it can be directly dissolved in water without adding acid, avoiding the decomposition of sodium bicarbonate caused by adding acid during the cross-linking process; the solubility of low molecular weight chitosan is greatly affected by pH after it is cross-linked to form a film. Therefore, the dissolution of the chitosan film can still be controlled by the pH of the aqueous solution when using water-soluble cosmetics, thereby releasing the tea polyphenols on the bamboo charcoal.

[0045] (5) Use bamboo charcoal and vegetable oil to make emulsion or paste to facilitate the storage and use of cosmetic materials; add salicylic acid to the vegetable oil, and use salicylic acid to assist the vegetable oil in adjusting the pH of the cosmetic when it is dissolved in water, thereby dissolving the chitosan membrane; after the chitosan membrane is broken, salicylic acid can accelerate the decomposition of sodium bicarbonate and further accelerate the release process of tea polyphenols. Salicylic acid can remove the stratum corneum on the surface of the skin, thereby promoting the skin's absorption of tea polyphenols. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] The cosmetics referred to in the present invention refer to all cosmetics added with the modified cosmetic materials in the following embodiments, including facial creams, facial cleansers, etc.

[0048] Example 1

[0049] A modified cosmetic material, comprising the following preparation steps by weight:

[0050] S1. Add 20 parts of bamboo charcoal into 150 parts of deionized water, boil the deionized water, filter the deionized water while it is hot, and put the filtered bamboo charcoal into an oven to dry;

[0051] Dissolve 3 parts of tea polyphenols in 100 parts of warm water to obtain a tea polyphenol solution, wherein the temperature of the warm water is 75°C;

[0052] Take 7 portions of dried bamboo charcoal and add them to the tea polyphenol solution, and stir for 10 minutes to fully mix the bamboo charcoal and the tea polyphenol solution. During the stirring process, the temperature of the tea polyphenol solution remains unchanged.

[0053] Stop stirring, slowly cool the tea polyphenols solution to 20°C, allow the tea polyphenols to precipitate on the surface of the bamboo charcoal, and let it stand for 4 hours.

[0054] S2, dissolving 2 parts of high molecular weight chitosan and 2 parts of cross-linking agent in tea polyphenol solution, adding organic acid to acidify the tea polyphenol solution; through the cross-linking effect between chitosan and cross-linking agent, the chitosan is formed into a film and covered on the surface of bamboo charcoal; after standing for 3 hours, bamboo charcoal with surface film is obtained; the organic acid here can be oxalic acid, acetic acid and other acids. The cross-linking agent here can be sodium alginate, glutaraldehyde, genipin, etc.; in this embodiment, oxalic acid is used to adjust the acidity and alkalinity of the tea polyphenol solution, and sodium alginate is used as a cross-linking agent.

[0055] 8 parts of bamboo charcoal with a surface film and 1 part of salicylic acid are added to 10 parts of vegetable oil, then added to 100 parts of deionized water, and then added with an emulsifier, and stirred and mixed for 3 hours to obtain a cosmetic material. The emulsifier can be a glycerol lipid, sodium stearoyl glutamate, and the like. This embodiment uses a glycerol lipid emulsifier, and the amount of the emulsifier added is increased or decreased according to the emulsification of the cosmetic material in actual production.

[0056] Example 2

[0057] A modified cosmetic material, comprising the following preparation steps by weight:

[0058] S1. Add 20 parts of bamboo charcoal into 200 parts of deionized water, boil the deionized water, filter the deionized water while it is hot, and put the filtered bamboo charcoal into an oven to dry;

[0059] Dissolve 4 parts of tea polyphenols in 110 parts of warm water to obtain a tea polyphenol solution, wherein the temperature of the warm water is 85°C;

[0060] Take 12 portions of dried bamboo charcoal and add them to the tea polyphenol solution, and stir for 10 minutes to fully mix the bamboo charcoal and the tea polyphenol solution. During the stirring process, the temperature of the tea polyphenol solution remains unchanged.

[0061] Stop stirring, slowly cool the tea polyphenols solution to 25°C, allow the tea polyphenols to precipitate on the surface of the bamboo charcoal, and let it stand for 4 hours.

[0062] S2, dissolving 2 parts of high molecular weight chitosan and 2 parts of cross-linking agent in tea polyphenol solution, adding oxalic acid to acidify the tea polyphenol solution; through the cross-linking effect between chitosan and cross-linking agent, the chitosan is formed into a film and covered on the surface of bamboo charcoal; after standing for 5 hours, bamboo charcoal with a surface film is obtained;

[0063] 10 parts of surface film-forming bamboo charcoal and 1 part of salicylic acid are added to 12 parts of vegetable oil, then added to 100 parts of deionized water, and then added with a glycerol lipid emulsifier, and stirred and mixed for 3 hours to obtain a cosmetic material.

[0064] Example 3

[0065] Compared with Example 2, the difference lies in step S2. In this example, high molecular weight chitosan is first oxidized to low molecular weight chitosan using hydrogen peroxide, and then the low molecular weight chitosan and sodium alginate are directly dissolved in the tea polyphenol solution, and oxalic acid is not added to the tea polyphenol solution to adjust the pH.

[0066] Example 4

[0067] Compared with Example 3, the difference is that before using the bamboo charcoal to adsorb tea polyphenols, the bamboo charcoal is modified using ethylenediaminetetraacetic acid.

[0068] The modification steps are as follows: 1 part of ethylenediaminetetraacetic acid is dissolved in 160 parts of boiling water by weight. Then 15 parts of bamboo charcoal, which has been removed by deionized water and dried in an oven, are added to the above ethylenediaminetetraacetic acid solution and stirred for ten minutes to fully mix the bamboo charcoal and the ethylenediaminetetraacetic acid solution; after stopping stirring, the mixture is cooled to 20°C to obtain bamboo charcoal modified with ethylenediaminetetraacetic acid.

[0069] Example 5

[0070] Compared with Example 4, the difference is that in the process of using bamboo charcoal to adsorb tea polyphenols, 2 parts of sodium chloride are added to the tea polyphenol solution and stirred for 10 minutes to dissolve it. After the stirring is completed, the tea polyphenol solution begins to cool down, so that the tea polyphenols are adsorbed on the bamboo charcoal.

[0071] Example 6

[0072] Compared with Example 5, the difference is that before salicylic acid is added to vegetable oil, it undergoes the following pretreatment steps: salicylic acid is added to ethanol to dissolve; after the salicylic acid is completely dissolved, deionized water is slowly added to the ethanol until the salicylic acid precipitates to form fine particles, and salicylic acid particles are obtained by filtering.

[0073] Example 7

[0074] Compared with Example 6, the difference is that after the tea polyphenol solution is cooled to 20-25°C and adsorbed on the bamboo charcoal, 1 part of sodium bicarbonate is first added to the tea polyphenol solution by weight to dissolve, and then allowed to stand for 4 hours to allow the tea polyphenols and sodium bicarbonate to precipitate on the surface of the bamboo charcoal.

[0075] Comparative Example 1

[0076] Compared with Example 6, the difference is that no cross-linking agent is added during the blending of chitosan and bamboo charcoal.

[0077] Comparative Example 2

[0078] Compared with Example 6, the difference is that salicylic acid is not added during the process of emulsifying the bamboo charcoal with film-forming surface by adding vegetable oil and water.

[0079] The performance of the cleansing milk prepared by using the modified cosmetic materials synthesized in Examples 1 to 7 and Comparative Examples 1 to 2 was tested.

[0080] Open the cap of the cleanser bottle and place it in the open air. On different experimental days, take 1 ml of the cleanser and dissolve it in 100 ml of warm water at 55°C, and stir it for 1 minute to mix it evenly. Then take out the aqueous solution and use a UV spectrophotometer to measure the tea polyphenols content in the aqueous solution.

[0081] The specific experimental data are as follows: The horizontal direction of the table represents the number of days the cleanser bottle cap is opened, and the vertical direction represents the time when the cleanser solution is sampled after the cleanser is dissolved in water and stirred. The tea polyphenol content of comparative example 1 when the bottle cap is opened and the sample is taken 0.5 minutes after the stirring is completed is set as 100.

[0082] Example 1 data are as follows

[0083]

[0084] Example 2 data are as follows

[0085]

[0086] Example 3 data are as follows

[0087]

[0088] Example 4 Data are as follows

[0089]

[0090] Example 5 data are as follows

[0091]

[0092] Example 6 data are as follows

[0093]

[0094] Example 7 data are as follows

[0095]

[0096] The data of comparative example 1 are as follows

[0097]

[0098] Comparative Example 2 data are as follows

[0099]

[0100] The following conclusions can be drawn from the above data analysis:

[0101] 1. From the data of Example 6 and Comparative Example 1, it can be seen that:

[0102] In Comparative Example 1, the chitosan film was not used to coat the bamboo charcoal. When the cleanser was dissolved in water, the tea polyphenols on the bamboo charcoal did not need to pass through the chitosan film to dissolve quickly in the water, and the dissolution rate was faster. Therefore, the tea polyphenol content remained almost unchanged within the sampling time of 0.5 min to 5 min. At the same time, as the cleanser was placed for a certain period of time, the tea polyphenols contained in the solution were oxidized. After 120 days, the tea polyphenol content was less than half of the initial value.

[0103] After the cleansing milk in Example 6 was dissolved in water, the chitosan film was destroyed and the tea polyphenols attached to the bamboo charcoal were released. The maximum tea polyphenol content measured in Example 6 was lower than that in Comparative Example 1. It is speculated that although the chitosan film was destroyed, it still affected the release of tea polyphenols on the bamboo charcoal to a certain extent. However, after the bottle cap of the cleansing milk in Example 6 was opened for 180 days, the emulsion was dissolved in two parts of water and then sampled, and the tea polyphenol content could still reach 90. The cleansing milk still has better applicability.

[0104] 2. In Comparative Example 2, salicylic acid was not added. When the facial cleanser was dissolved in water, the aqueous solution was neutral, the chitosan membrane could not be destroyed, and the tea polyphenols attached to the bamboo charcoal could not enter the aqueous solution; therefore, the small amount of tea polyphenols measured was part of the tea polyphenols in the emulsion, and the tea polyphenol content was extremely low. As time went by, the tea polyphenols in the emulsion were completely oxidized, and tea polyphenols could not be measured after 120 days. At the same time, it was indirectly shown that the chitosan membrane had better sealing performance, which could effectively prevent the outside air from passing through the chitosan membrane to oxidize the tea polyphenols.

[0105] 3. By comparing the data of Example 1, Example 2 and Example 3, it can be found that after the facial cleanser in Example 3 is dissolved in water, the rate of increase of its tea polyphenol content within 0.5min to 5min is much higher than that of Example 1 and Example 2, which indicates that the chitosan film in Example 3 dissolves faster, and the use of low-molecular chitosan for cross-linking film formation can increase the release rate of tea polyphenols, so that the tea polyphenols on the bamboo charcoal are dissolved in water in the shortest possible time, thereby improving the performance of the facial cleanser.

[0106] 4. By comparing the data of Example 3, Example 4 and Example 5, it can be found that the bamboo charcoal modified with EDTA can improve the adsorption effect of bamboo charcoal on tea polyphenols, thereby increasing the content of tea polyphenols on bamboo charcoal. Adding sodium chloride during the process of bamboo charcoal adsorbing tea polyphenols increases the precipitation amount of tea polyphenols, so that more tea polyphenols are attached to the bamboo charcoal.

[0107] 5. Comparing the data of Example 5 and Example 6, the growth rate of tea polyphenols in Example 6 within 0.5min to 5min is faster than that in Example 5, indicating that the chitosan film in Example 6 dissolves faster. The dissolution rate of chitosan film in water can be increased by pretreatment with salicylic acid.

[0108] 6. By comparing the data of Example 6 and Example 7, it can be found that the tea polyphenols contents of Example 6 and Example 7 at about 5 minutes are similar, but the tea polyphenols content measured in Example 7 at about 2 minutes is higher than that of Example 6, which shows that adding sodium bicarbonate can accelerate the release rate of tea polyphenols, so that the tea polyphenols on the bamboo charcoal can be released in a shorter time.

Claims

1. A modified cosmetic material, characterized in that: By weight, the method comprises the following synthesis steps: Dissolve 3-4 parts of tea polyphenols in 100-110 parts of water to obtain a tea polyphenol solution; Add 7-12 parts of bamboo charcoal to the tea polyphenol solution and let it stand for 4 hours to allow the tea polyphenol to be adsorbed onto the bamboo charcoal; Adding 2 parts of chitosan and 2 parts of a cross-linking agent into the tea polyphenol solution, and forming a film of chitosan on the surface of the bamboo charcoal through the cross-linking effect between the chitosan and the cross-linking agent, thereby obtaining a bamboo charcoal with a surface film; 8-10 parts of bamboo charcoal with a surface film and 1 part of salicylic acid are added to 10-12 parts of vegetable oil, and then an emulsifier and 100 parts of deionized water are added, and the mixture is stirred and mixed to obtain a cosmetic material.

2. A modified cosmetic material according to claim 1, characterized in that: Before adding the tea polyphenol solution, the bamboo charcoal is modified by using ethylenediaminetetraacetic acid, which comprises the following modification steps by weight: S1. Add 20 parts of bamboo charcoal into 150-200 parts of deionized water, boil the deionized water, filter the deionized water while it is hot, and put the filtered bamboo charcoal into an oven to dry; S2, dissolving 1 part of ethylenediaminetetraacetic acid in 160 parts of boiling water to obtain an ethylenediaminetetraacetic acid solution, adding 15 parts of the bamboo charcoal dried in the oven in S1 to the ethylenediaminetetraacetic acid solution, stirring the ethylenediaminetetraacetic acid solution for 10 minutes to make the bamboo charcoal mix evenly; S3, stopping stirring, cooling the EDTA solution to 20° C., filtering the EDTA solution to obtain bamboo charcoal modified with EDTA.

3. A modified cosmetic material according to claim 2, characterized in that: By weight, adsorbing tea polyphenols onto the surface of bamboo charcoal comprises the following steps: S1. Dissolve 3-4 parts of tea polyphenols in 100-110 parts of warm water to obtain a tea polyphenol solution, wherein the temperature of the warm water is in the range of 75° C. to 85° C.; S2, adding 7 to 12 parts of bamboo charcoal to the tea polyphenol solution, and stirring to fully mix the bamboo charcoal and the tea polyphenol solution, and keeping the temperature of the tea polyphenol solution unchanged during the mixing process; S3, adding 2 parts of sodium chloride to the tea polyphenol solution, stirring the saturated tea polyphenol solution for 10 minutes to dissolve the sodium chloride, and keeping the temperature of the tea polyphenol solution unchanged during the stirring process; S4. Stop stirring, slowly cool the tea polyphenols solution to 20-25°C, and let it stand for 4 hours to allow the tea polyphenols to precipitate on the surface of the bamboo charcoal.

4. A modified cosmetic material according to claim 3, characterized in that: In step S4, after the tea polyphenol solution is cooled to 20-25° C., 1 part of sodium bicarbonate is first added to the tea polyphenol solution by weight to dissolve, and then allowed to stand for 4 hours to allow the tea polyphenol and sodium bicarbonate to precipitate on the surface of the bamboo charcoal.

5. The modified cosmetic material according to claim 4, characterized in that: The chitosan is degraded into low molecular weight chitosan using hydrogen peroxide before cross-linking.

6. A modified cosmetic material according to claim 5, characterized in that : The cross-linking agent is sodium alginate; by weight, 2 parts of low molecular weight chitosan and 2 parts of sodium alginate are added to the tea polyphenol solution and mixed, and after standing for 3 to 5 hours, the surface film-forming bamboo charcoal is obtained after filtering.

7. The modified cosmetic material according to claim 1, characterized in that: By weight, the emulsification process of adding the bamboo charcoal and salicylic acid to the vegetable oil to form a surface film is as follows: S1. Add salicylic acid to ethanol and dissolve it; after the salicylic acid is completely dissolved, slowly add deionized water to the ethanol until the salicylic acid precipitates to form fine particles, and filter to obtain salicylic acid particles. S2. Add 1 part of salicylic acid particles and 8-10 parts of surface film-forming bamboo charcoal into 10-12 parts of vegetable oil, add 100 parts of deionized water, and then add an emulsifier and stir for 3 hours to obtain a cosmetic material.

8. A cosmetic, characterized in that A modified cosmetic material comprising any one of claims 1 to 7.

Images