An oil-sensitive skin cleansing composition and a method of making the same

Abstract

The application provides an oil-sensitive skin cleaning composition and a preparation method thereof, and relates to the technical field of skin care products. The composition comprises an oil control component, a soothing component, a sebum-like component, a water-soluble polymer, and an ambient fragrance component. The oil control component can remove oil, achieve oil control, and remove oil without removing water. The soothing component can increase the mildness of the formula and reduce the irritation of the formula. The sebum-like component can also achieve the effect of removing oil without removing water, protect the oil-sensitive skin during cleaning, prevent dryness and tightness of the skin caused by excessive cleaning, and remove oil without removing water. The water-soluble polymer component wraps or winds surfactant molecules, reduces the combination of free surfactant molecules and proteins in the cuticle, and thus reduces irritation. The soothing component soothes the skin that has contacted the cleaning composition and prevents inflammatory reactions. The ambient fragrance component plays a role in relieving stress, relaxing the body and mind, and promoting sleep while cleaning the skin.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of skin care, in particular to an oil-sensitive skin cleaning composition and a preparation method thereof. BACKGROUND

[0002] With the development of technology and the increase of entertainment ways, people's living habits have changed, and more and more people have the habit of staying up late. Frequent overtime work will not only cause mental fatigue, but also cause a series of skin problems: overtime work will cause the loss of internal water in the body, and the skin is prone to dryness and water loss; overtime work will cause sleep deprivation, and the skin around the eyes is prone to dark circles; overtime work will affect the normal endocrine of the human body, causing the metabolism of the skin to be disordered, which will cause the sebaceous glands to be stimulated, thereby causing the increase of oil secretion of the skin.

[0003] Research has found that overtime work will cause abnormal oil secretion of the skin, and if the oil is not cleaned in time, it will block the pores and form blackheads and acne, and in severe cases, it will turn into acne; the oil secreted by the skin is mainly composed of lipids and sebaceous gland secretions, which contain certain fatty acids and cholesterol, and if it is not cleaned in time, these oils will come into contact with air and epidermal cells, causing an oxidation reaction, producing some harmful chemicals that will stimulate the skin, causing the skin barrier to be damaged, and the skin to be prone to sensitivity. Therefore, the habit of staying up late leads to a large number of people with oily and sensitive skin (skin that is prone to oiliness and skin sensitivity).

[0004] Oily and sensitive skin, also known as "oil-sensitive skin", is one of the main characteristics of skin problems in people who stay up late. The characteristic of oil-sensitive skin is both oily and sensitive, which is skin that has both "oily" and "sensitive" elements, because the skin has both an imbalance (excessive sebaceous secretion) and damage (skin barrier damage).

[0005] Research has found that overtime work will cause the increase of sebaceous glands and increase the incidence of skin acne. Secondly, there are differences in skin microecology between people who stay up late and people who do not stay up late, leading to an increase in the abundance of propionic acid bacillus and pseudomonas. In addition, the skin problems of people who stay up late are barrier damage, decreased water content, increased sebaceous glands, and increased skin pigmentation, which are all closely related to skin sensitivity problems. The oil produced by the skin must be cleaned in time, because the oil exposed to the air will undergo an oxidation reaction, producing some harmful chemicals that will stimulate the skin; of course, the cleaning must be gentle to prevent stimulating the already sensitive skin; while cleaning, moisturizing should be done to restore the skin to normal as soon as possible.

[0006] There is no special cleaning product for people with oily and sensitive skin on the market. The common cleansing products on the market are developed for oily skin, focusing on improving the ability to clean and remove oil, but the cleaning power is too strong, which can easily damage the skin barrier of oily and sensitive skin, and is not suitable for sensitive skin. In order to achieve the effect of cleaning power, the amount of surfactant in the formula on the market is sufficient, and the increase of the amount of surfactant will increase the irritation. Therefore, it is difficult to find a cleansing product with good cleaning ability and low irritation for people with oily and sensitive skin. Therefore, it is urgent to develop a cleaning product for the increasing number of people with oily and sensitive skin. SUMMARY

[0007] The purpose of the present application is to provide an oily and sensitive skin cleaning composition and a preparation method thereof to solve the above problems.

[0008] To achieve the above purpose, the following technical solutions are adopted in the present application:

[0009] The present application first provides an oily and sensitive skin cleaning composition, which comprises, by weight percentage: 0.05%-2% of oil control ingredient, 0.05-0.5% of soothing ingredient, 0.05-0.8% of sebum-like ingredient, 0.3%-6% of water-soluble polymer, 0.01-0.3% of ambient fragrance ingredient, and the balance of water.

[0010] The oil control ingredient can remove oil, achieve cleaning and oil control, and remove oil without removing water. The soothing ingredient can increase the mildness of the formula and reduce the irritation of the formula. It can soothe the skin that has been in contact with the cleaning composition and prevent inflammatory reactions. The sebum-like ingredient can also achieve the effect of removing oil without removing water. It can clean the skin while protecting the oily and sensitive skin from dryness and tightness caused by excessive cleaning, and achieve the effect of removing oil without removing water. The water-soluble polymer ingredient can wrap or wrap the surfactant molecules, reduce the combination of free surfactant molecules with proteins in the cuticle, and thus reduce the irritation of the cleaning composition. The ambient fragrance ingredient can relieve stress, relax the body and mind, and promote sleep while cleaning the skin.

[0011] Preferably, the oil control ingredient is selected from any one or a combination of more than one of zinc yeast, honey acid, PCA zinc, white willow bark extract, and camellia seed extract;

[0012] Preferably, the oil control ingredient is a combination of zinc yeast and camellia seed extract;

[0013] Preferably, in the composition, the oil control ingredient comprises, by weight percentage: 0.05-0.5% of zinc yeast and 0.05-1% of camellia seed extract.

[0014] Among them, yeast zinc is a kind of zinc-rich yeast that absorbs and transforms zinc in the growth and metabolism process, and makes zinc combine with the protein and polysaccharide in the yeast body, which is easier to combine with the skin, has the effect of controlling oil, anti-inflammatory and inhibiting propionibacterium acnes. Camellia seed extract mainly uses enzyme to carry out enzymatic reaction on camellia seed, so that the active ingredients in the cells are released, and then the purified plant saponin is purified, which has the effect of gently cleaning the skin.

[0015] The addition of camellia seed extract can improve the cleaning performance of the product, reduce the amount of surfactant in the cleaning formula, and at the same time, not reduce the cleaning performance; camellia seed oil extract can reduce the amount of surfactant to achieve the same cleaning effect, while reducing the irritation caused by excessive use of surfactant, and improving the mildness of the product; yeast zinc and camellia seed extract can play a synergistic effect to control oil; yeast zinc and camellia seed extract can achieve the effect of removing oil without removing water.

[0016] Preferably, the soothing ingredient is selected from a combination of one or more of citrus fruit extract, spilanthes flower / leaf / stem extract, and gentian root extract.

[0017] Preferably, the soothing ingredient is selected from a citrus fruit extract.

[0018] Among them, the citrus fruit extract contains flavonoids and alkaloids, which can inhibit the activation and expression of keratinocyte TRPV1, and relieve skin discomfort in time. Generally, due to the hydrophilic and lipophilic properties of surfactants, they have certain interfacial action and permeability, which causes the reaction of keratinocytes, makes keratinocyte TRPV1 express, and makes the skin appear tingling, itching and redness. Therefore, when cleaning sensitive skin, in addition to using mild surfactants to reduce irritation, some soothing ingredients can also be used to regulate keratinocyte TRPV1 expression and relieve skin discomfort in time. Citrus fruit extract has soothing effect and can reduce the irritation of the formula.

[0019] Preferably, the sebum-like ingredient is selected from a combination of one or more of cetyl stearyl alcohol, squalane, palmitic acid, and stearic acid.

[0020] Preferably, the sebum-like ingredient is selected from squalane.

[0021] Squalane is a kind of excellent hydrocarbon oil extracted from squalene in deep-sea shark liver by hydrogenation. Squalane itself is colorless and odorless, and is chemically inert, with high moisturizing and moisturizing properties. Squalene is one of the components of intercellular lipids, that is, sebum film, which is one of the components of the outermost water-locking defense layer of the skin. By adding squalane ingredients in the formula, squalane will actively deposit on the skin during the washing process, supplementing the lost lipid components during the cleaning process; at the same time, squalane can also saturate the micelles by acting as sacrificial lipids, thereby minimizing the lipid consumption of surfactant micelles, thereby protecting the surfactant from damaging the sebum film of the skin, protecting the fragile stratum corneum of oily skin, and reducing the irritation of surfactants in cleansing formulations, while also achieving the effect of oil removal without water.

[0022] Preferably, the water-soluble polymer is selected from a combination of any one or more of acrylic acid (ester) copolymer, modified corn starch, and acrylic acid (ester) / C10-30 alkyl alcohol acrylate cross-linked polymer;

[0023] Preferably, the water-soluble polymer is selected from a combination of acrylic acid (ester) copolymer and modified corn starch.

[0024] Preferably, in the composition, the water-soluble polymer comprises, by weight percentage: 0.1-3% of acrylic acid (ester) copolymer and 0.2-3% of modified corn starch.

[0025] Preferably, in the composition, the water-soluble polymer comprises, by weight percentage: 0.1-3% of acrylic acid (ester) copolymer and 0.2-3% of modified corn starch.

[0026] Preferably, the ambient fragrance ingredient is selected from a combination of any one or more of lemongrass, basil, agarwood, lavender, and sage essential oil or essence;

[0027] Preferably, the ambient fragrance ingredient is sage essential oil.

[0028] Clary sage is a perennial woody herb with a special fragrance. The clary sage essential oil, which is obtained by distillation, acts on the pineal gland in our brain. It can help us to awaken intuition, enhance inspiration, relax and nourish the tired brain, and even has a better soothing and sleep-inducing effect than lavender essential oil. Clary sage essential oil contains more linalyl acetate, which can regulate the secretion of balanced hormones, thereby relieving anxiety, stabilizing mood and sleep. The addition of clary sage essential oil fragrance can relieve stress, relax the body and mind, and promote sleep while cleaning the skin.

[0029] Preferably, the composition comprises, by weight percentage: 0.1% of zinc yeast, 0.5% of camellia seed extract, 0.3% of citrus fruit extract, 0.2% of squalane, 1.5% of acrylic acid (ester) copolymer, 2.2% of modified corn starch, 0.1% of clary sage essential oil, and the balance of water.

[0030] Preferably, the composition further comprises, by weight percentage: 5%-20% of anionic surfactant, 0.5%-12% of amphoteric surfactant, and 0.2%-3% of skin conditioning agent.

[0031] The anionic surfactant and the amphoteric surfactant are necessary components in the cleaning product, which play a cleaning role. In the composition of the present application, other components are mainly added to reduce the amount of anionic surfactant and amphoteric surfactant; the skin conditioning agent can replace the traditional preservative to achieve less irritation, so as to be suitable for oil-sensitive skin cleaning.

[0032] Preferably, in the composition, the anionic surfactant comprises, by weight percentage: 5-18% of potassium cocoyl glycinate, 0.1-0.5% of sodium lauryl glycol carboxylate;

[0033] The amphoteric surfactant comprises, by weight percentage: 0.5-5% of sodium cocoamphoacetate, 0.3-6% of lauryl hydroxysulfobetaine;

[0034] The skin conditioning agent comprises, by weight percentage: 0.1-2% of p-hydroxyacetophenone, 0.1-0.8% of 1,2-hexanediol.

[0035] The present application also provides a preparation method of an oil-sensitive skin cleaning composition, comprising:

[0036] The anionic surfactant, the amphoteric surfactant, the camellia seed extract, the p-hydroxyacetophenone, and the modified corn starch are emulsified at 80-85°C to obtain a first mixture;

[0037] The sebum-like component and the acrylic acid (ester) copolymer are added to the first mixture and stirred to defoam to obtain a second mixture;

[0038] The second mixture is cooled to 40-45℃, and zinc yeast, ambient fragrance, 1,2-hexanediol, and citrus fruit extract are sequentially added, and the pH is adjusted to 6.0-7.8 to obtain the oil-sensitive skin cleaning composition.

[0039] Compared with the prior art, the beneficial effects of the present application include:

[0040] The oil-sensitive skin cleaning composition provided by the present application comprises an oil control component, a soothing component, a sebum-like component, a water-soluble polymer, and an ambient fragrance component. The oil control component can remove oil and achieve clean and oil control without removing water. The soothing component can increase the mildness of the formula and reduce the irritation of the formula. The sebum-like component can also achieve the effect of removing oil without removing water, protecting the oil-sensitive skin during cleaning, preventing dryness and tightness of the skin caused by excessive cleaning, and achieving oil removal without water removal. In order to achieve mild and soothing cleaning for sensitive skin, in addition to using mild surfactants and reducing the amount of surfactants, water-soluble polymer components are added to wrap or entangle surfactant molecules, reducing the combination of free surfactant molecules with proteins in the stratum corneum, thereby reducing the irritation of the cleaning composition. In addition, soothing components are added to soothe the skin that has been in contact with the cleaning composition and prevent inflammatory reactions. In order to relieve fatigue in people who stay up late, relax the body and mind, and promote sleep, the cleaning composition also adds an ambient fragrance component, which can relieve stress, relax the body and mind, and promote sleep while cleaning the skin. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope of the present application.

[0042] Figure 1 The figure is the cleaning rate result graph corresponding to different embodiment samples;

[0043] Figure 2 The figure is the skin oil content result graph corresponding to different embodiments;

[0044] Figure 3 The figure is the 15min oil change rate result graph corresponding to different embodiments;

[0045] Figure 4 The figure is the change in skin water content before and after use result graph corresponding to different embodiments;

[0046] Figure 5 The figure is the change rate of skin water content before and after use result graph corresponding to different embodiments;

[0047] Figure 6Results plot of oil change rate for different embodiments 30 min. DETAILED DESCRIPTION

[0048] As used herein the terms "about" and "substantially" mean approximately or nearly, as in "about 90%," "substantially identical," or "substantially similar," to indicate any value plus or minus ten percent.

[0049] "Made from" is synonymous with "comprising." The terms "comprising," "including," "having," "with," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements but can include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0050] The transitional phrase "consisting of" excludes any element, step, or ingredient not specified. If used in the claims, this phrase shall not be construed to mean that the noted elements or steps are essential to the practice of the claims. The phrase "consisting of" shall not be interpreted to mean that any reference sign in the claims shall be construed as limiting the claim beyond the contents of the organized clause.

[0051] When expressing amounts, concentrations, or other values or parameters of a range, preferably a range, or a series of upper preferred values and lower preferred values, it should be understood that all ranges formed by any pair of any upper or lower limit or preferred value, whether or not the range is expressly disclosed, are specifically disclosed. For example, when a range "1-5" is disclosed, the described range should be interpreted to include ranges "1-4," "1-3," "1-2," "1-2 and 4-5," "1-3 and 5," etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include the endpoints and all integers and fractions within that range.

[0052] In these examples, the parts and percentages are by mass unless otherwise indicated.

[0053] "Mass parts" refers to a basic unit of measurement that represents the proportional relationship of the mass of multiple components, 1 part can represent any unit of mass, such as 1 g, 2.689 g, etc. If we say that the mass parts of component A is a parts, and the mass parts of component B is b parts, it means that the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it means that the mass of component A is aK, and the mass of component B is bK (K is an arbitrary number, representing a multiple factor). It must not be misunderstood that, unlike mass parts, the sum of the mass parts of all components is not limited to 100 parts.

[0054] "and / or" is used to indicate one or both possibilities can occur, for example, A and / or B includes (A and B) and (A or B).

[0055] The embodiments of the present application will be described in detail below with specific examples, but those skilled in the art will understand that the following examples are only for illustration of the present application, and should not be regarded as limiting the scope of the present application. If the specific conditions are not specified in the examples, they are carried out under the conventional conditions or the conditions recommended by the manufacturer. If the reagents or instruments used are not specified by the manufacturer, they are all conventional products that can be obtained by commercial purchase.

[0056] The camellia seed extract used in the following examples and comparative examples was purchased from Guangdong Jingqu Biological Technology Co., Ltd., the acrylic acid (ester) copolymer was purchased from Lubrizol Advanced Materials Co., Ltd., the citrus fruit extract was purchased from Shanghai Jia Kai Biological Technology Co., Ltd., and the sage essential oil was purchased from Wilfen (Beijing) Science and Technology Development Co., Ltd.

[0057] Example 1

[0058] The oil-sensitive skin cleansing composition of Example 1 includes, by weight percentage, potassium cocoyl glycinate 12%, sodium lauryl glycol carboxylate 0.5%, sodium cocamphoacetate 1%, lauryl hydroxysultaine 2.5%, camellia seed extract 0.5%, squalane 0.2%, modified corn starch 2.2%, acrylic acid (ester) copolymer 1.5%, zinc yeast 0%, citrus fruit extract 0.3%, p-hydroxyacetophenone 0.5%, 1,2-hexanediol 0.5%, sage essential oil 0%, and the balance of water.

[0059] The preparation method of the oil-sensitive skin cleansing composition of Example 1 is as follows:

[0060] The potassium cocoyl glycinate, sodium lauryl glycol carboxylate, sodium cocamphoacetate, lauryl hydroxysultaine, camellia seed extract, p-hydroxyacetophenone, and modified corn starch were added to an emulsifying kettle in proportion, and stirred and heated to 80-85°C; after being stirred uniformly at 80-85°C, squalane was added, and stirred uniformly; then the acrylic acid (ester) copolymer pre-mixed with water was added, and defoaming was performed under vacuum; after being stirred uniformly, the temperature was lowered to 40-45°C; the zinc yeast, sage essential oil, 1,2-hexanediol, and citrus fruit extract were sequentially added under low-speed stirring, and the pH was adjusted to 6.0-7.8 with citric acid, and then the mixture was stirred uniformly and discharged for detection.

[0061] The formulations of the oil-sensitive skin cleansing compositions of Examples 2 to 7 and Comparative Examples 1 to 8 are shown in Table 1, which are prepared according to the preparation method of Example 1, and the oil-sensitive skin cleansing compositions of Examples 2 to 7 and Comparative Examples 1 to 8 are prepared respectively, and the efficacy of the oil-sensitive skin cleansing compositions of Examples 1 to 7 and Comparative Examples 1 to 8 is evaluated.

[0062] Formulations of the oil-sensitive skin cleansing compositions of each of the examples and comparative examples in Table 1

[0063]

[0064]

[0065]

[0066]

[0067] Efficacy evaluation

[0068] 1. Cleaning performance evaluation

[0069] 1) Test principle

[0070] In recent years, methods for evaluating the cleaning ability of products have become diversified. Subjective evaluation methods include consumer questionnaires and sensory evaluation by professionals, and objective evaluation methods include evaluating the skin color difference or L* value difference under different conditions based on instruments such as colorimeters, and then quantitatively evaluating the cleaning ability of products. In order to make the test results more objective, a skin biomimetic stain is used to simulate common facial stains, which is dyed, and by comparing the change in skin color difference before and after cleaning, the stain removal ability of the facial cleanser is quantitatively reflected. The closer the skin state after cleaning is to the initial state of the skin before use, i.e. the smaller the △E, the cleaner the skin, i.e. the stronger the cleaning ability of the cleaning product.

[0071] 2) Test method

[0072] The raw materials of the skin biomimetic stain include C10-18 triglyceride 34 g, hexadecyl hexadecanoate 23 g, oleic acid 17 g, squalane 10 g, ceramide 5 g, phytosteryl isostearate 4 g, hydrogenated lecithin 4 g, cholesterol 2 g, and pigment 1 g.

[0073] The preparation method is as follows: the raw materials except the pigment are mixed according to the ratio, heated to 70 degrees Celsius, the pigment is finally added, stirred uniformly, and cooled to room temperature to obtain the skin biomimetic stain.

[0074] Experimental procedure: Before the test, the volunteers first washed the inner side of the forearms with water at about 35°C, sat and rested for 20 minutes in the test environment, and then started the test after natural drying. Two symmetrical areas without hair on the inner side of the forearms of the volunteers were selected, and the test area boundary was marked with positioning paper. Randomly numbered A and B, the test area of the volunteer's arm was smeared according to the dirt amount of 3 mg / cm 2 After uniform smearing, it was naturally dried. The volunteers smeared the test product in two different areas A and B. The test area was cleaned with a fixed method, and then washed with water at a fixed flow rate of 3 L / min and at about 35°C for 20 seconds.

[0075] After the volunteers' test area was naturally dried, a dermoscope was used to take pictures of each test area, and the skin micrograph of the test area after cleaning with the sample was saved. The larger the L value, the more white it is, and vice versa. The a value represents the balance from green to red, and the larger the a value, the more red the skin is, and vice versa. The b value represents the balance from blue to yellow, and the larger the b value, the more yellow it is, and vice versa. The color difference can be calculated by the difference of L value, a value and b value, which is consistent with the feeling of eyes.

[0076] The skin micrograph of the volunteers before smearing dirt, after smearing dirt and after cleaning with the sample was obtained, and the IPP software was used to analyze the L value, a value and b* value of the picture, respectively. The color difference after smearing dirt compared with before smearing dirt was calculated, recorded as ΔΕ (after smearing), and the color difference after cleaning with the product compared with after smearing dirt was calculated, recorded as ΔΕ (after cleaning). ΔΕ can reflect the stereo change of color, and the larger the ΔΕ value, the more obvious the color difference is, and the smaller the ΔΕ value, the closer the color is. The cleaning ability of the product is calculated by the ΔΕ value; each sample corresponds to three testers, and the cleaning rate is calculated according to the cleaning rate calculation formula, and the average value is finally taken to obtain the cleaning rate of each sample. The cleaning rate calculation formula is:

[0077]

[0078]

[0079] 3) Test results and analysis

[0080] The test results are shown in Tables 2 and Figure 1As shown, the test of Comparative Example 1 and Example 4 cleaning ability can be found that the cleaning rate of Comparative Example 1 is 76.16%, and the cleaning rate of Example 4 is 90.77%, which proves that the addition of 0.5% camellia seed extract can improve the cleaning power of the product, and the camellia seed extract can improve the cleaning power of the product. Comparative Example 7 is to add the lower limit of 0.1% camellia seed extract, and its cleaning rate is 81.37%, which proves that the camellia seed extract can improve the cleaning power of the product even at the lower limit of the amount used. The cleaning rate of Example 7 is 91.23%, which proves that the upper limit of the camellia seed extract concentration can improve the cleaning power of the product, but the cleaning rate only increases by 0.44% when the concentration is doubled, so 0.5% is selected as the optimal proportion.

[0081] In Comparative Example 8, the surfactant potassium cocoyl glycinate is increased to 18%, and it can be found that its cleaning power (90.98%) is almost the same as that of Example 4 (90.77%), which proves that the addition of camellia seed extract can reduce the amount of surfactant, but still achieve the same cleaning effect. In order to achieve a certain cleaning power, skin cleaning products on the market must add enough amount of surfactant, which often brings more irritation to the product.

[0082] In summary, in this experiment, the irritation caused by excessive use of surfactant can be reduced by adding camellia seed extract to improve the mildness of the product, but the cleaning effect caused by the reduction of surfactant will not be reduced.

[0083] Table 2: Cleaning rate test data results

[0084]

[0085] 2. Oil removal without water removal efficiency evaluation

[0086] 1) Test principle

[0087] The water and oil content before and 15 minutes after using the product is tested, and the conclusion of oil removal without water removal is drawn according to the results.

[0088] 2) Test method

[0089] 35 people in the overworked group were selected, with skin type of oily and sensitive skin, male to female ratio of 5:5, and age of 18-55 years old, finally ensuring 30 people to complete the test.

[0090] The subjects who passed the screening test cannot use skin care products on the morning of the test day. After checking in the laboratory, the Sebumeter and Corneometer instruments were used to test the skin oil and moisture, respectively;

[0091] After the test, the subjects were given product usage instructions, and after listening to the instructions, the products were distributed and used. The subjects sat for 15 minutes in a temperature of 21.0°C ± 1.0°C and a humidity of 50% ± 10%.

[0092] After 15 minutes, the skin moisture and oil content were tested.

[0093] 3) Test results were summarized and averaged

[0094] The oil content change data is shown in Table 3 and Figure 2 to Figure 3 The difference between Comparative Example 1 and Example 4 is that Comparative Example 1 does not add camellia seed extract; the difference between Comparative Example 4 and Example 4 is that Comparative Example 4 does not add squalane; Example 2 is a lower limit sample of the formula; and Example 5 is an upper limit sample of the formula.

[0095] From the 15-minute oil content change data analysis, it can be seen that both Example 4 and Comparative Example 1 have the effect of removing oil, and the 15-minute oil change rate of Example 4 is higher than that of Comparative Example 1, indicating that Example 4 with 0.5% camellia seed extract has better cleaning effect. It is generally believed that the purpose of a cleansing composition is to wash away sebum, sweat, and other dirt secreted by the skin, and the addition of oil components in the formula will weaken the cleaning power of the formula. The oil change rate of Comparative Example 4 is less than that of Example 4, which also proves this point; Example 5 adds the upper limit of squalane, which fills the micelles formed by the surfactant, reducing the oil removal ability.

[0096] Table 3 Oil Test and Change Rate Data

[0097]

[0098] The moisture content change data is shown in Table 4 and Figure 4 to Figure 5 From the 15-minute moisture content change data analysis, it can be seen that the 15-minute moisture change rate of Example 4 with 0.2% squalane and Comparative Example 1 is lower than that of Comparative Example 4 (without adding squalane), and the result of Example 5 with 0.8% squalane shows that the addition of squalane can weaken the excessive cleaning of the skin by the cleaning ingredients and weaken the damage to the sebaceous membrane, thereby maintaining a better moisture content of the skin.

[0099] The 15 min moisture change rate of Example 4 with 0.5% camellia seed extract is slightly lower than Comparative Example 1, indicating that the addition of camellia seed extract can achieve cleaning without damaging the stratum corneum as much as possible, thereby further maintaining the moisture content of the skin, indicating that the addition of squalane and camellia seed extract can achieve better cleaning while maintaining the skin in a better moisture state. When each concentration reaches the upper limit (Example 5), the moisture retention ability is not significantly improved compared to the optimal ratio (Example 4), so from the cost and efficacy dimensions, Example 4 is selected as the optimal ratio. In combination with the oil change data, the composition of the application achieves the effect of removing oil without removing water.

[0100] Table 4 Moisture test and change rate data

[0101]

[0102] 3 Oil control efficacy evaluation

[0103] 1) Test principle

[0104] The skin oil test meter Sebumeter SM815 of Germany CK is used in the present scheme to evaluate the efficacy of the oil absorption paper. The SEBUMETER method is recognized as the oil test method, which is based on the principle of photometer. A special 0.1mm thick extinction tape absorbs the oil on the human skin, which becomes a kind of translucent tape, and its light transmission will change. The more oil absorbed, the greater the light transmission, so the content of skin oil can be measured. The biggest advantage is that the test probe is small in size, easy to use, and can test any position of the skin. It is an indirect measurement method of sebaceous gland secretion, and the results can be used to distinguish different skin types, so that it is possible to accurately understand the changes of oil caused by internal and external reasons.

[0105] 2) Test method

[0106] Test environment: the test environment temperature is 21±1℃, and the humidity is 50±5%.

[0107] Test volunteers: aged 18-55 years old (except pregnant or lactating women), people who often stay up late, skin type is oily and sensitive; no serious systemic disease, no immune deficiency or autoimmune disease; no use of hormone drugs and immune suppressants in the past month; no participation in other clinical trials; use the test sample as required and have complete information; all volunteers should fill in the informed consent form before the test.

[0108] Test steps:

[0109] Test Preparation: The test site should not be used any product (cosmetic or external medicine) for 2-3 days before the test. Before the test, draw three 3cm*3cm areas on the forehead of the tester, respectively, to evaluate the skin oil content, and calculate the oil content increment percentage by averaging three values to make relevant judgments.

[0110] Test Process: After the subject sat in the constant temperature and humidity chamber for 30 minutes, the oil content of the marked area on the forehead was determined as the original value. Then, an equal amount of experimental sample was used on the test area of the subject, and the same number of circles was rubbed. After rinsing and drying for 30 minutes, the oil content of the three areas was determined, respectively. The test of the same volunteer was completed by the same measurement personnel.

[0111] 3) Test Results and Analysis

[0112] a. The calculation formula of oil change rate is: M%=(M(1)-M(2)) / M(1)*100%

[0113] Note: M is the oil change rate, %;

[0114] M(2) is the skin oil content 30 minutes after using the sample;

[0115] M(1) is the original value of the skin oil content before using the sample.

[0116] The test results are shown in Table 5 and Figure 6 Example 1 is without the addition of yeast zinc ingredient, and the others are the same as Example 4; Example 2 is the lower limit sample of the formula; Example 5 is the upper limit sample of the formula; Comparative Example 1 is the formula sample without the addition of camellia seed extract; and Comparative Example 2 is the sample without the addition of camellia seed oil extract and yeast zinc.

[0117] The 30-minute oil change rate represents the strength of the oil control ability of the sample, and the higher the change rate represents the stronger the oil control effect. From Figure 6 it can be seen that the oil control effect of Comparative Example 1 with the addition of yeast zinc is stronger than that of Comparative Example 2, proving that the addition of yeast zinc alone can improve the oil control ability of the formula. Although camellia seed extract is a cleaning ingredient, it is found that it also synergizes with other oil control ingredients to achieve oil control synergism. By comparing the data of Example 1 (36.34%) and Comparative Example 2 (30.21%), it can be seen that the oil control effect of Example 1 with the addition of 0.5% camellia seed extract is stronger than that of Comparative Example 2, proving that the addition of camellia seed extract alone can also improve the oil control efficacy of the formula. By comparing the data of Example 4 (79.26%) with Example 1 (36.34%) and Comparative Example 1 (35.78%), it can be proved that the simultaneous addition of yeast zinc and camellia seed extract has a synergistic oil control effect.

[0118] Table 5 Oil Change Rate Test Results

[0119]

[0120] 4. Efficacy evaluation of soothing

[0121] 1) Test name: Red blood cell hemolysis test for product irritation.

[0122] 2) Test principle: The red blood cell irritation test was established by the European Center for Validation of Alternative Methods, which is used to replace the rabbit eye test for irritation. The principle of testing irritation is that irritating chemicals cause damage to the red blood cell membrane, leading to the leakage and denaturation of hemoglobin, so that the content of oxygenated hemoglobin can be quantified by detecting hemolysis and protein denaturation, thereby quantifying the irritation of the tested substance. Many international laboratories use red blood cell hemolysis test to evaluate the eye irritation of cosmetics and raw materials and other chemicals. This experiment is carried out according to the experimental test method of the European Center for Validation of Alternative Methods (ECVAM). The greater the hemolysis rate, the more irritating the sample.

[0123] 3) Test result analysis

[0124] The test results are shown in Table 6. As can be seen from Table 6, after adding citrus fruit extract, the irritation of the formula can be significantly reduced, and the change of the amount of citrus fruit extract added also has an effect on the irritation of the formula. The higher the amount of citrus fruit extract added, the lower the irritation of the formula.

[0125] Table 6 Corresponding hemolysis rate of different samples

[0126]

[0127]

[0128] Using the formula base of Comparative Example 3, the effect of adding different soothing ingredients and amounts on irritation was screened, and the results are shown in Table 7. As can be seen from Table 7, when the same active substance is added to the same base, citrus fruit extract contributes the most to the mildness of the soothing formula; the optimal amount of citrus fruit extract added is 0.3%, considering cost and effect.

[0129] Table 7 Corresponding hemolysis rate of different soothing ingredients added to the formula base of Comparative Example 3

[0130] Soothing active Addition amount % Lysis rate % Scutellaria extract 0.5 23.1 Magnolia biondii extract 0.5 24.6 Gentiana extract 0.5 27.8 Citrus fruit extract 0.5 8.9 Citrus fruit extract 0.4 9.1 Citrus fruit extract 0.3 10.2 Citrus fruit extract 0.2 15.0

[0131] The results of the influence of the water-soluble polymer on the formula are shown in Table 8. As can be seen from Table 8, the formula of Example 4 has the greatest mildness, i.e., the formula simultaneously adds the acrylic copolymer and the modified corn starch, and the two thickening agents have a synergistic effect of reducing irritation; although Example 3 also simultaneously adds the acrylic copolymer, the modified corn starch and the citrus fruit extract, the amount is not appropriate, the mildness is not outstanding, and the viscosity of the formula is relatively thin, which is not good for the use experience of consumers; the formula of Comparative Example 6 using the acrylic copolymer alone is milder than the formula of Comparative Example 5 using the modified corn starch alone, but has the problem of being difficult to apply; the formula of Example 4 simultaneously adding the acrylic copolymer and the modified corn starch has the best experience of the material body, and the formula is also relatively mild.

[0132] Table 8: Hemolysis rate of different samples

[0133] Sample name Feel of use Lysis rate % Example 3 Thin, not easy to use 29.8 Example 4 Easy to spread and disperse 10.2 Comparative example 5 Easy to spread and disperse 22.3 Comparative example 6 Difficult to spread and disperse 19.5

[0134] 5. Fragrance soothing effect evaluation

[0135] 1) Test sample: cleansing products prepared according to Example 4 and Example 6.

[0136] 2) Test subjects: 60 people who often stay up late (sleep after 23:00 more than 4 times a week), aged 18-55, male to female ratio 5:5.

[0137] 3) Experimental method and test result statistics: 30 people were randomly selected to use the sample of Example 4 according to their normal pre-sleep cleansing habits, and another 30 people used the sample of Example 6. After 30 days of use, a scoring evaluation was conducted, and the specific scoring criteria are shown in Table 9.

[0138] Table 9: Evaluation scoring criteria

[0139]

[0140]

[0141] The post-use evaluation of 30 people is shown in Table 10. According to the data analysis, 80% of the 30 test subjects using the sample of Example 6 with added sage essential oil believed that it was helpful for relieving stress, relaxing the body and mind, and promoting sleep, and 43% believed that it was significantly helpful. However, only 13% of the 30 test subjects using the sample of Example 4 without added sage essential oil believed that it was helpful, and only 3% believed that it was significantly helpful. Therefore, the cleansing composition with added sage essential oil is helpful for relieving stress, relaxing the body and mind, and promoting sleep after being used by people who stay up late.

[0142] Table 10 uses the feedback of 30 testers of each of the samples of Example 4 and Example 6

[0143]

[0144] 6, sensitive skin can be evaluated

[0145] 1) Test principle: according to the "Cosmetic Safety Technical Specification" (2015 edition) Chapter 7 Human Safety Test Method 3 Sensitive Skin Human Trial Test Evaluation.

[0146] 2) Test method: 30 sensitive skin subjects were recruited to participate in the test, the age range of the subjects was 18-55 years old, after using the sample of Example 6 for 4 weeks, the feedback results of 30 subjects after using the sample were collected.

[0147] 3) Test results and analysis

[0148] According to the skin reaction grading standard in the "Cosmetic Safety Technical Specification" (2015 edition), i.e. Table 11, the results were statistically analyzed, and the specific results are shown in Table 12. From Table 12, it can be seen that after 2 weeks and 4 weeks of using the product, the skin reaction grading of all 30 sensitive skin testers is 0, no one feedbacks discomfort and allergic phenomenon, which shows that the product is relatively mild and can be claimed to be suitable for sensitive skin people.

[0149] Table 11 Skin reaction grading standard for human trial test

[0150] Skin reaction Classification No reaction 0 Weak erythema 1 Erythema, infiltration, papule 2 Erythema, edema, papule, blister 3 Erythema, edema, bulla 4

[0151] Table 12 30-day trial feedback of 30 sensitive people

[0152] Number of tester feedback persons Score of skin reaction after 4 weeks of use 30 persons 0 0 person 1 0 person 2 0 person 3 0 person 4

[0153] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0154] Furthermore, to the extent that the terms "comprises", "comprising", "includes", "including" and "has" or any variation thereof are used in the following description and / or claims, such terms are intended to include a non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Also, where appropriate to context, the above description and / or claims can refer to actions to be taken by a person or apparatus. Such actions are sometimes referred to as being taken by an "operator" or "user" where it is contextualually appropriate. However, such actions, or steps, are taken autonomously and automatically by an apparatus, without intervention of a person.

Claims

1. A cleansing composition for oily and sensitive skin, characterized in that, The composition, by weight percentage, comprises: 0.05%-2% oil-controlling ingredient, 0.05%-0.5% soothing ingredient, 0.05%-0.8% sebum-like ingredient, 0.3%-6% water-soluble polymer, 0.01%-0.3% ambient fragrance ingredient, and the balance being water; The oil-controlling ingredient is selected from a combination of zinc yeast and camellia seed extract; The soothing ingredient is selected from citrus fruit extract; The sebum-like component is selected from squalane; The water-soluble polymer is selected from a composition of acrylic (ester) copolymers and modified corn starch; The ambient fragrance ingredients are selected from any one or more essential oils or fragrances of lemongrass, basil, agarwood, lavender, and sage.

2. The cleansing composition for oily and sensitive skin according to claim 1, characterized in that, The oil-controlling components in the composition, by weight percentage, include: 0.05-0.5% zinc yeast and 0.05-1% camellia seed extract.

3. The cleansing composition for oily and sensitive skin according to claim 1, characterized in that, In the composition, the water-soluble polymer comprises, by weight percentage: 0.1-3% acrylic (ester) copolymer and 0.2-3% modified corn starch.

4. The cleansing composition for oily and sensitive skin according to claim 1, characterized in that, The ambient fragrance ingredient is sage essential oil.

5. The cleansing composition for oily and sensitive skin according to claim 1, characterized in that, The composition, by weight percentage, comprises: 0.1% zinc yeast, 0.5% camellia seed extract, 0.3% citrus fruit extract, 0.2% squalane, 1.5% acrylic (ester) copolymer, 2.2% modified corn starch, 0.1% sage essential oil, and the balance being water.

6. The cleansing composition for oily and sensitive skin according to any one of claims 1 to 5, characterized in that, The composition, by weight percentage, further includes: 5%-20% anionic surfactant, 0.5%-12% amphoteric surfactant, and 0.2%-3% skin conditioning agent.

7. The cleansing composition for oily and sensitive skin according to claim 6, characterized in that, In the composition, the anionic surfactant comprises, by weight percentage: 5-18% potassium cocoyl glycinate and 0.1-0.5% sodium lauryl glycol carboxylate; The amphoteric surfactant comprises, by weight percentage: 0.5-5% sodium cocoamphoacetate and 0.3-6% lauryl hydroxysulfonate betaine; The skin conditioning agent comprises, by weight percentage: 0.1-2% p-hydroxyacetophenone and 0.1-0.8% 1,2-hexanediol.

8. A method for preparing the cleansing composition for oily and sensitive skin according to claim 6 or 7, characterized in that, include: Anionic surfactant, amphoteric surfactant, camellia seed extract, p-hydroxyacetophenone, and modified corn starch were emulsified at 80-85℃ to obtain the first mixture; Add a sebum-like component and an acrylic (ester) copolymer to the first mixture, stir to defoam, and obtain a second mixture; The second mixture was cooled to 40-45°C, and then yeast zinc, ambient fragrance, 1,2-hexanediol, and citrus fruit extract were added sequentially. The pH was adjusted to 6.0-7.8 to obtain the oily and sensitive skin cleansing composition.

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