Emulsifier composition for skin care cream and application thereof

Abstract

The invention relates to an emulsifier composition for skin care cream and application of the emulsifier composition. The emulsifier composition is composed of a functional cationic water-in-oil emulsifier SE-320 and a water-in-oil emulsifier A-7, can be used for preparing a water-in-oil skin care cream for moisturizing and controlling oil of skin, and accounts for 2.5-4.0% by mass of the skin care cream. Wherein the mass ratio of the functional cationic water-in-oil emulsifier SE-320 to the water-in-oil emulsifier A-7 is 1: (0.2-5.0). The water-in-oil skin care cream applying the emulsifier composition is stable in quality and excellent and stable in moisturizing and oil control effects.

Description

Technical Field

[0001] The present invention belongs to the field of cosmetics, and specifically relates to an emulsifier composition for skin care cream and its application in preparing a water-in-oil skin care cream for moisturizing and oil control, as well as a skin care cream product using the emulsifier composition. Background Art

[0002] In recent years, as consumers' awareness of skin care has increased, the moisturizing and oil-controlling cosmetics market has shown a rapid growth trend. As the basis of skin care, moisturizing and oil-controlling have become an indispensable part of consumers' daily lives. Consumers pay more and more attention to the ingredients and efficacy of products, and tend to choose moisturizing and oil-controlling cosmetics containing natural, organic and harmless ingredients. For example, moisturizing ingredients such as sodium hyaluronate, ceramide, avocado butter, etc., and oil-controlling ingredients such as lauric acid and myristic acid, etc.

[0003] In addition to active ingredients for moisturizing and oil control, there are few products that use emulsifiers in cosmetics to improve the moisturizing and oil control effects of skin care creams. Among them, oil-in-water type skin care creams containing emulsifiers are particularly lacking in product varieties, and there is a lack of corresponding emulsifier variety selection and corresponding formula design.

[0004] In the formulation design of skin care creams, achieving a balance between oil control and moisturizing requires overcoming multiple difficulties: on the one hand, moisturizing relies on oil to form a closed oil film to lock in moisture, but excessive occlusion can easily lead to acne or stickiness on oily skin; on the other hand, oil control requires reducing oil content or adding oil-absorbing ingredients, but this may weaken long-term moisturizing ability. At this time, the choice of emulsifier becomes key, especially the choice of compound emulsifier becomes an important selection path. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an emulsifier composition composed of a functional cationic oil-in-water emulsifier SE-320 and an oil-in-water emulsifier A-7 for use in preparing an oil-in-water skin care cream for moisturizing and controlling oil on the skin, wherein the mass percentage of the emulsifier composition to the mass percentage of the skin care cream is 2.5% to 4.0%, and the mass ratio of the functional cationic oil-in-water emulsifier SE-320 to the oil-in-water emulsifier A-7 is 1:9 to 9:1.

[0006] Preferably, in the above use, the mass ratio of the functional cationic oil-in-water emulsifier SE-320 to the oil-in-water emulsifier A-7 is 7:3, 1:1 and 3:7.

[0007] Preferably, in the above use, the mass percentage of the emulsifier composition to the mass percentage of the skin care cream is 3%.

[0008] Preferably, in the above use, the skin care cream further comprises oil, polyol and inorganic salt, wherein the oil is one or more of mineral oil, silicone oil, synthetic oil and natural oil, preferably, the oil is white oil, and particularly preferably, the white oil is 5# white oil. The polyol is one or more of glycerol, sorbitol, propylene glycol and butylene glycol, preferably, the polyol is glycerol. The inorganic salt is magnesium sulfate heptahydrate or sodium chloride.

[0009] Preferably, in the above-mentioned use, the mass content of the oil in the water-in-oil skin care cream is 10% to 16%, particularly preferably, the mass content of the oil in the water-in-oil skin care cream is 13%, the mass content of the polyol in the skin care cream is 15% to 20%, particularly preferably, the mass content of the polyol in the skin care cream is 18%, and the mass content of the inorganic salt in the skin care cream is 1%.

[0010] Preferably, in the above use, moisturizing and controlling oil on the skin means moisturizing and controlling oil on the skin within 2 hours.

[0011] The present invention also provides an oil-in-water skin care cream for moisturizing and controlling oil on human skin. The skin care cream comprises an emulsifier composition, which is composed of a functional cationic oil-in-water emulsifier SE-320 and an oil-in-water emulsifier A-7. The mass percentage of the emulsifier composition to the mass percentage of the skin care cream is 2.5% to 4.0%, and the mass ratio of the functional cationic oil-in-water emulsifier SE-320 to the oil-in-water emulsifier A-7 is 1:9 to 9:1.

[0012] Preferably, in the above skin care cream, the mass ratios of the functional cationic oil-in-water emulsifier SE-320 and the oil-in-water emulsifier A-7 are 7:3, 1:1 and 3:7.

[0013] Preferably, in the above skin care cream, the mass percentage of the emulsifier composition in the skin care cream is 3%.

[0014] Preferably, in the above skin care cream, the skin care cream further comprises oil, polyol and inorganic salt, wherein the oil is one or more of mineral oil, silicone oil, synthetic oil and natural oil, preferably, the oil is white oil, and particularly preferably, the white oil is 5# white oil. The polyol is one or more of glycerol, sorbitol, propylene glycol and butylene glycol, preferably, the polyol is glycerol. The inorganic salt is magnesium sulfate heptahydrate or sodium chloride.

[0015] Preferably, in the above-mentioned skin care cream, the mass content of the oil in the water-in-oil skin care cream is 10% to 16%, particularly preferably, the mass content of the oil in the water-in-oil skin care cream is 13%, the mass content of the polyol in the skin care cream is 15% to 20%, particularly preferably, the mass content of the polyol in the skin care cream is 18%, and the mass content of the inorganic salt in the skin care cream is 1%.

[0016] The present invention provides a new emulsifier composition, which realizes the moisturizing and oil-controlling effects of an oil-in-water skin care cream product on the skin. Since the moisturizing and oil-controlling effects of single-component emulsifiers, such as cationic oil-in-water emulsifier SE-320 and oil-in-water emulsifier A-7, are not ideal, when the two emulsifiers are used in combination in a skin care cream product, not only the quality stability of the skin care cream can be ensured, but also the moisturizing and oil-controlling effects of the skin care cream can be effectively improved, especially the effects on the stability of the moisturizing and oil-controlling effects are obvious.

[0017] After the skin care cream of the present invention adopts the above emulsifier composition, the quality of the skin care cream can be guaranteed to be stable, and the moisturizing and oil control effects are also very significant and stable. DETAILED DESCRIPTION

[0018] The functional cationic oil-in-water emulsifier SE-320 and oil-in-water emulsifier A-7 used in the following examples are produced by Shantou Daqian High-tech Research Center Co., Ltd.

[0019] Functional cationic water-in-oil emulsifier SE-320 is sometimes referred to as SE-320 hereinafter.

[0020] The water-in-oil emulsifier A-7 is sometimes referred to as A-7 hereinafter.

[0021] Example 1 Preparation and stability test of skin care cream 1. Preparation of emulsifier composition The functional cationic oil-in-water emulsifier SE-320 and the oil-in-water emulsifier A-7 were mixed in different mass ratios to obtain an emulsifier composition. The specific mass ratios and names are shown in Table 1: Table 1 Composition and ratio of emulsifier composition

[0022] 2. Preparation of skin care cream The above-mentioned emulsifier compositions of combination No. 1 to No. 9 are respectively used to prepare skin care creams, and the corresponding skin care creams are numbered from Cream No. 01 to Cream No. 09. Cream No. 10 is a skin care cream prepared using only SE-320, and Cream No. 11 is a skin care cream prepared using only A-7. The specific raw material ingredients and amounts of each skin care cream are shown in Table 2 below.

[0023] Table 2 Raw material composition and proportion of skin care cream

[0024] According to the ratio of the raw material ingredients for preparing the skin care cream in the above Table 2, the skin care cream is prepared according to the following process: the components of the water phase and the oil phase are mixed separately, and the water phase and the oil phase are evenly dissolved by stirring; under high-speed stirring, the water phase is slowly added dropwise to the oil phase, and the time for the addition is controlled to be 15 to 20 minutes; after the addition of the water phase is completed, flavors are added, and high-speed stirring is maintained for 30 minutes to obtain an oil-in-water skin care cream.

[0025] 3. Testing of the quality stability of skin care creams The stability test method is based on the "Determination of Storage Stability of Surfactant Oil-in-Water Emulsion" (GB / T 16497-2007) and combined with the requirements in actual applications. The test method and conditions are as follows: High temperature test: 50℃ constant temperature box for 30 days, then return to room temperature (more than 8 hours), no change inside the paste; Low temperature test: After continuous freezing at -25℃ for 30 days and returning to room temperature (more than 8 hours), there is no change inside the paste; Cyclic test: -25℃ / 50℃ 12 h cold and hot alternate cycle for 30 days, return to room temperature (more than 8 h), no change inside the paste; Freeze-thaw test: Freeze at -25℃ for 12 h and then return to room temperature (12 h), then freeze for another 12 h and then return to room temperature (12 h). After 15 days of freeze-thaw cycles, there was no change inside the paste.

[0026] The results of the stability tests of the above 11 skin care creams are shown in Table 3 below.

[0027] Table 3 Quality stability test results of skin care cream

[0028] In the above Table 3, "√" indicates that there is no change inside the paste, and the corresponding stability test is passed; "×" indicates that the paste has oiling, stratification, demulsification and other phenomena, and the corresponding stability test is not passed.

[0029] After testing, it was found that Cream No. 08, Cream No. 09, and Cream No. 11 did not pass the freeze-thaw test and should be eliminated in the subsequent moisturizing and oil control tests. However, because Cream No. 11 (emulsifier A-7) is a single component in the emulsifier composition, in order to study the enhancement effect of the emulsifier composition compared with the single emulsifier and the necessity of the combination, Cream No. 11 was retained for the moisturizing and oil control test experiment (when testing moisturizing and oil control, the skin care cream sample was used directly without the above stability test). For Cream No. 01 to Cream No. 07, in order to obtain the moisturizing and oil control effect of the emulsifier composition with a relatively large ratio interval, Cream No. 03, Cream No. 05, and Cream No. 07 were selected for moisturizing and oil control tests. Together with Cream No. 10 and Cream No. 11, there were a total of 5 test samples, plus distilled water as a blank control, and each tester conducted 6 moisturizing and oil control test areas.

[0030] Example 2 Moisturizing and Oil Control Test of Skin Care Cream Pre-test preparation Do not use any cosmetics or topical drugs within 2 days before the test, and do not touch water within 2 hours before the test. Before the test, the subjects clean the inner forearms of both hands. The cleaning method is: wipe it clean with dry tissue paper. Determine and mark 3 test areas on the inner forearm of the left hand and the inner forearm of the right hand of the subject. The area of ​​the test area is about 3cm×3cm, and the interval between each test area is greater than 1cm. After cleaning, sit quietly in a room with standard room temperature for 30 minutes before the formal test, do not drink water or beverages, expose your forearms, place them in the test state, and keep relaxed.

[0031] Testing Methods The sample application area and the blank control area are randomly distributed in the marked areas of the left and right arms to ensure that all products and blank area positions are statistically balanced. The test sample is applied once at a dosage of (2.0±0.3) mg / cm², and the blank control area is applied with distilled water at the same dosage. The test sample and distilled water are evenly applied to the test area using a disposable latex fingertip. Use a skin moisture and oil tester to measure the sample application area and the blank control area according to the requirements of the instructions. Each area is measured 3 times in parallel. The test position in the same area must be changed each time, and the original position should not be tested. The moisture and oil values ​​of each area are tested 3 times, and then the average value is calculated.

[0032] During the first test (i.e. 0 hour), the moisture and oil values ​​of the sample application area and the blank control area were tested and the average value was calculated. The second test was conducted 2 hours later, and the skin moisture and oil values ​​of the sample application area and the blank control area were measured 3 times each, and then the average value was calculated.

[0033] The same subject uses the same instrument in the test sample application area and the blank control area, and in the first and second tests, and cleans the measuring probe between the two measurements. If the volunteer's skin has an adverse reaction during the test, the test is terminated immediately and the volunteer is given appropriate medical treatment. Adverse reactions are recorded.

[0034] Test Description For Cream No. 03, Cream No. 05, Cream No. 07, Cream No. 10 and Cream No. 11, moisturizing and oil-control tests were carried out on the inner sides of the left and right arms of the subjects. A total of 6 application areas were divided on the inner sides of the left and right forearms according to the above requirements, 3 application areas on the inner side of the left forearm, and 3 application areas on the inner side of the right forearm. The above 5 samples and distilled water were randomly applied to the 6 application areas, and the moisture and oil values ​​of the 6 application areas were tested within 15 minutes after application (recorded as "0 hours"), and the moisture and oil values ​​of the 6 application areas were tested again 2 hours later. The test was required to be completed within 15 minutes.

[0035] A total of 16 subjects participated in the test, including 5 males and 11 females, with the oldest age of 51 and the youngest age of 24. Through the measurement of the smear area at 0 hours and 2 hours, one of the smear areas of the left forearm of one subject (female) was slightly red, so the experiment was stopped. The remaining 15 subjects had no adverse reactions and were numbered as experimenter No. 01 to experimenter No. 15. For specific measurement results, please refer to Table 4 below. "Water value 1", "water value 2" and "water value 3" in Table 4 refer to the water value of one smear area tested 3 times, and "water value average" is the average of the water values ​​tested three times. Similarly, "oil value 1", "oil value 2" and "oil value 3" refer to the oil value of one smear area tested 3 times, and "oil value average" is the average of the oil value tested three times.

[0036] Table 4 Water content and oil content of skin care cream samples of the subjects at 0 hours and 2 hours

[0037] Example 3 Analysis of the moisturizing and oil-controlling effects of cream products For the data in Table 4, the average value of the water content of all subjects at 0 hours was calculated for each sample (including blanks). For example, the water content of the blank smear area, at 0 hours, the average value of the water content of each of the 15 subjects in the blank smear area {average value of 3 measurements: (water content 1 + water content 2 + water content 3) ÷ 3} (sum of the water content of the 15 subjects and divided by 15) was 46.49, as shown in the first row of data in the column named "average of the water content of the subjects at 0 hours" in Table 5 below. Similarly, the average value of the water content of the blank smear area in 2 hours on the 15 subjects was calculated to be 42.53, as shown in the first row of data in the column named "average of the water content of the subjects at 2 hours" in Table 5 below. The difference between these two data is 42.53-46.49=-3.96, which is marked in the first row of the column named "water content 2 hours average - 0 hours average". Through the above calculation and statistics, the "2-hour average value of moisture - 0-hour average value" and "2-hour average value of oil - 0-hour average value" of the 6 samples (including blank) are obtained. Please refer to the 4th and 7th columns in the following Table 5 for details. The calculation results of the remaining samples are shown in the following Table 5.

[0038] Table 5 Overall moisturizing and oil control effect data of each sample

[0039] As can be seen from Table 5, Cream 05 has the best moisturizing effect. After 2 hours, the average moisture content of the area where the sample of Cream 05 was applied only decreased by 0.87, which shows a very good moisturizing effect. Similarly, Cream 05 also has the best oil control effect. Only when the oil content of Cream 05 decreased did the oil control effect come true. That is, Cream 05 achieved the dual effects of moisturizing and oil control.

[0040] The data analysis of the moisturizing and oil-control of the above skin care cream samples is an analysis of the overall situation, which can generally reflect that Cream No. 05 achieves better moisturizing and oil-control.

[0041] According to the data in Table 5 above, a longitudinal comparison is made, that is, for each skin care cream sample, the percentage increase of the average water content at 0 hours and 2 hours relative to the average water content of the blank and the percentage increase of the average oil content relative to the average oil content of the blank are calculated. Take Cream No. 03 as an example: The percentage increase of the 0-hour average moisture value of Cream 03 over the blank average moisture value is calculated as follows: (Subject mean of the 0-hour moisture value of Cream 03 - Subject mean of the 0-hour moisture value of the blank) / Subject mean of the 0-hour moisture value of the blank × 100% The calculation of the values ​​in Table 6 is as follows: (48.62-46.49) / 46.49×100%=4.5816%, rounded to one decimal place to get 4.6%.

[0042] Similarly, the data values ​​of the 2-hour average moisture value of Cream 03 being increased by a percentage over the blank average moisture value, the 0-hour average oil value being increased by a percentage over the blank average oil value, and the 2-hour average oil value being increased by a percentage over the blank average oil value are calculated. In this way, the data values ​​of the 0-hour average moisture value being increased by a percentage over the blank average moisture value, the 2-hour average moisture value being increased by a percentage over the blank average moisture value, the 0-hour average oil value being increased by a percentage over the blank average oil value, and the 2-hour average oil value being increased by a percentage over the blank average oil value are calculated for Creams 05, 07, 10, and 11. The calculation results are shown in Table 6 below: Table 6 The percentage increase of the mean water and oil content of skin care creams compared with the blank

[0043] As can be seen from Table 6 above, the average moisture values ​​of Cream No. 03, Cream No. 05, and Cream No. 07 at 0 hours were all higher than the blank by more than 4.6%, while Cream No. 10 and Cream No. 11 were lower than 4.6% higher than the blank. The average moisture values ​​at 2 hours were also higher than the blank by more than 8.2%, while Cream No. 10 and Cream No. 11 were lower than 5.3% higher than the blank. This shows that these cream products can achieve moisturizing effects at 0 hours and 2 hours relative to the blank.

[0044] In terms of oil control, the average oil content of Cream 03, Cream 05, and Cream 07 at 0 hours was lower than that of the blank, and the oil content was reduced by 2.2% to 2.9%, achieving an oil control effect. Of course, Cream 10 and Cream 11 also achieved an oil control effect at 0 hours, and the oil control effect of Cream 11 even reached a reduction of 10.3% compared to the blank. However, at 2 hours, the average oil content of Cream 03, Cream 05, and Cream 07 was lower than that of the blank, achieving an oil control effect, and the oil content value was reduced by 5.9% to 14.7%, while the average oil content of Cream 10 and Cream 11 increased, with Cream 10 increasing by 14.1% and Cream 11 increasing by 10.2%. Not only did it not control oil, but it actually increased the oil content value.

[0045] That is to say, compared with the blank, only Cream No. 03, Cream No. 05 and Cream No. 07 can both moisturize and control oil in 2 hours, and the best one is Cream No. 05, whose 2-hour average moisture value is 17.2% higher than the blank, and its 2-hour average oil value is 14.7% lower than the blank, and it has the best moisturizing and oil-control effects.

[0046] The stability of moisturizing and oil-controlling effects of cream products was analyzed. Based on the above test results, the overall variance of the average moisture value at 0 hour (moisture mean), the average moisture value at 2 hours (moisture mean), the average oil value at 0 hour (oil mean), and the average oil value at 2 hours (oil mean) of each tester of each cream product was calculated to compare the stability of moisturizing and oil-controlling effects of cream products.

[0047] The formula for calculating the population variance is:

[0048] in: σ 2 represents the overall variance; x i is the i-th data point; μ is the population mean; N is the overall capacity.

[0049] The overall variance of the mean water content and the mean oil content of the blank and the five cream products was calculated, and the results are shown in Table 7 below.

[0050] Table 7 Overall variance of the mean water and oil content of cream products

[0051] It can be seen from Table 7 that the 2-hour water retention stability of Cream No. 03, Cream No. 05, and Cream No. 07 is better than that of Cream No. 10 and Cream No. 11. In terms of oil control, the 2-hour oil control stability of Cream No. 03, Cream No. 05, and Cream No. 07 is better than that of Cream No. 10 and Cream No. 11.

[0052] From the analysis of the above test results, it can be seen that when SE-320 and A-7 are used in skin care cream products in a mass combination of 3:7, 1:1, and 7:3, they can achieve better moisturizing and oil-control effects than skin care cream products using only SE-320 or only A-7, and the stability of the moisturizing and oil-control effects is also better.

[0053] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention specification, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An emulsifier composition composed of a functional cationic water-in-oil emulsifier SE-320 and a water-in-oil emulsifier A-7 is used to prepare a water-in-oil skin care cream for moisturizing and controlling oil on the skin, wherein the mass percentage of the emulsifier composition to the mass percentage of the skin care cream is 2.5% to 4.0%, and the mass ratio of the functional cationic water-in-oil emulsifier SE-320 to the water-in-oil emulsifier A-7 is 1:9 to 9:

1.

2. The use according to claim 1, characterized in that The mass ratios of the functional cationic water-in-oil emulsifier SE-320 and the water-in-oil emulsifier A-7 are 7:3, 1:1 and 3:

7.

3. The use according to claim 1, characterized in that The mass percentage of the emulsifier composition to the mass percentage of the skin care cream is 3%.

4. The use according to claim 1, characterized in that The skin care cream further comprises oil, polyol and inorganic salt.

5. A water-in-oil skin care cream for moisturizing and controlling oil on human skin, the skin care cream comprising an emulsifier composition, the emulsifier composition consisting of a functional cationic water-in-oil emulsifier SE-320 and an water-in-oil emulsifier A-7, the mass percentage of the emulsifier composition to the mass percentage of the skin care cream is 2.5% to 4.0%, and the mass ratio of the functional cationic water-in-oil emulsifier SE-320 to the water-in-oil emulsifier A-7 is 1:9 to 9:

1.

6. The skin care cream according to claim 5, characterized in that The mass ratios of the functional cationic water-in-oil emulsifier SE-320 and the water-in-oil emulsifier A-7 are 7:3, 1:1 and 3:

7.

7. The skin care cream according to claim 5, characterized in that The mass percentage of the emulsifier composition in the skin care cream is 3%.

8. The skin care cream according to claim 5, characterized in that The skin care cream further comprises oil, polyol and inorganic salt.

9. The skin care cream according to claim 8, characterized in that The oil is 5# white oil, the polyol is glycerol, and the inorganic salt is magnesium sulfate heptahydrate.

10. The skin care cream according to claim 9, characterized in that The mass content of oil in the water-in-oil skin care cream is 13%, the mass content of the polyol in the skin care cream is 18%, and the mass content of the inorganic salt in the skin care cream is 1%.

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