Bitter gourd soothing and moisturizing mask and preparation method thereof

Abstract

The invention belongs to the technical field of cosmetics, and particularly relates to a bitter gourd soothing and moisturizing mask and a preparation method thereof. Essence in the mask is prepared from components in percentage by mass as follows: 2%-10% of a bitter gourd concentrated solution, 0.05%-0.2% of a centella asiatica extract, 0.1%-1.5% of nicotinamide, 0.01%-1% of ceramide NP, 0.1%-2% of a citrus fruit extract, 0.05%-0.5% of a scutellaria baicalensis root extract, 0.1%-0.8% of a glycyrrhiza inflata root extract, 0.1%-0.8% of a radix sophorae flavescentis root extract, 5%-15% of a humectant, 0.5%-1% of a thickener, 0.5%-2% of a preservative and the balance of deionized water. 0.5-1.5% of an emulsifier and the balance of water. According to the invention, a plurality of anti-inflammatory soothing components are matched with the balsam pear concentrated solution to prepare the mask essence, and the components interact with one another, so that the anti-inflammatory soothing effect of the mask can be remarkably improved, and the skin care demand of consumers on integrally and comprehensively improving the sensitive state of the skin is met.

Description

Technical Field

[0001] The invention belongs to the technical field of cosmetics, and in particular relates to a bitter melon soothing and moisturizing facial mask and a preparation method thereof. Background Art

[0002] Bitter melon (Monlordica charantia L) is an annual vine herb of the genus Momordica in the Cucurbitaceae family. It is also known as bitter melon, blighted melon, blighted grape and brocade lychee. It is a plant with both medicinal and edible properties. According to the records in "Southern Yunnan Materia Medica", "Bitter melon tastes bitter and is cold in nature. It enters the heart, spleen, and lung meridians. It removes evil heat, relieves fatigue, clears the heart and brightens the eyes. It drains the six meridians of real fire, clears away heat and replenishes qi, and stops thirst", "It treats all kinds of fire poisons and gases, and treats malignant sores and toxic sores, or those who have sesame boils and large boils all over the body and the pain is unbearable. Take the leaves, dry them and grind them into powder. Take (three coins) each time, and take it with ash-free wine. It is very effective. It also treats bayberry sores. Grind the flowers of this melon into powder, treat stomach pain, and take it with boiled water; treat eye pain, and take it with lamp grass soup". It can be seen that bitter melon has good effects of clearing away heat and detoxifying, tonifying the kidney and strengthening the spleen. It also has a certain therapeutic effect on diseases such as dysentery, sores and acne. However, there is currently little research on bitter melon extracts in anti-inflammatory and soothing cosmetics.

[0003] With the acceleration of people's pace of life, the increase of work pressure and the change of diet structure, the number of people with allergies has increased rapidly. Skin allergies have become a social problem that affects human health and a hot topic for scholars. At present, the development of natural anti-inflammatory soothing additives mostly achieves soothing and repair effects through a single anti-inflammatory pathway. Although it can improve skin sensitivity to a certain extent, it cannot meet consumers' expectations of skin care from the perspective of "skin health" and comprehensively improve skin sensitivity.

[0004] Therefore, research and development of bitter melon extract functional raw materials, based on the principles of dispelling wind and evil, clearing away heat and detoxifying, and combining with other soothing and anti-allergic functional raw materials to achieve the multi-pathway anti-inflammatory and soothing effects of soothing products, has broad market prospects. Summary of the invention

[0005] The object of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a bitter melon soothing and moisturizing facial mask and a preparation method thereof.

[0006] To achieve the above objectives, the technical solutions adopted by the present invention include:

[0007] In a first aspect, the present invention provides a bitter melon soothing and moisturizing facial mask, comprising an essence and a facial mask cloth, wherein the essence comprises the following components in percentage by mass: 2-10% bitter melon concentrate, 0.05-0.2% Centella asiatica extract, 0.1-1.5% niacinamide, 0.01-1% ceramide NP, 0.1-2% citrus fruit extract, 0.05-0.5% scutellaria root extract, 0.1-0.8% glycyrrhiza inflata root extract, 0.1-0.8% sophora flavescens root extract, 5-15% moisturizer, 0.5-1% thickener, 0.5-2% preservative, 0.5-1.5% emulsifier and the remainder water.

[0008] The bitter melon concentrate of the present invention contains a variety of compounds with anti-inflammatory effects, such as flavonoids and saponins, which can inhibit the production of inflammatory factors, reduce oxidative stress, and help soothe the skin; the Centella asiatica extract contains the dried Centella asiatica asiatica acid component, has a good anti-inflammatory effect, and helps to promote skin repair and regeneration; the citrus fruit extract contains rich vitamin C and flavonoid components, can relieve skin inflammation, and help remove dead skin cells and improve skin moisture; the scutellaria root extract contains baicalin and baicalein, has a strong anti-inflammatory effect, and can effectively relieve skin discomfort; the glycyrrhizic acid in the Glycyrrhiza inflata root extract has certain anti-inflammatory and anti-allergic effects, helps to soothe skin's sensitive irritation, and plays a good moisturizing effect; the main components in the Sophora flavescens root extract, such as matrine, have a good anti-inflammatory effect and help soothe the skin; ceramide NP, as an important skin lipid, can help repair and maintain the skin's barrier function, improve the skin's moisturizing ability, and reduce the effects of external irritants and allergens on the skin, thereby reducing the skin's inflammatory response and soothing sensitive skin.

[0009] After a large number of experiments and investigations, the inventors found that by combining the above-mentioned anti-inflammatory and soothing ingredients with bitter melon concentrate to prepare a facial mask essence, the components interact and cooperate with each other, which can significantly enhance the anti-inflammatory and soothing effects of the facial mask, and is suitable for acne-prone and dry skin. In particular, there is an obvious synergistic effect between the bitter melon concentrate and the Centella asiatica extract, Glycyrrhiza uralensis root extract, and ceramide NP. When any one or more of the four components are missing, the anti-inflammatory and soothing effects of the facial mask essence are significantly reduced, and the moisturizing effect is also significantly deteriorated.

[0010] In addition, the inventors explored the dosage of each component and found that when the dosage ratio of bitter melon concentrate, Centella asiatica extract, Glycyrrhiza uralensis root extract, and ceramide NP exceeded the specified range of the present invention, the synergistic effect between the components was not obvious and even produced an antagonistic effect, thereby resulting in a decrease in the anti-inflammatory, soothing, and moisturizing and repairing effects of the facial mask, indicating that the above four components have an ideal synergistic effect within the preferred range of the present invention.

[0011] Preferably, the essence comprises the following components in percentage by mass: 4-7% of bitter melon concentrate, 0.08-0.15% of Centella asiatica extract, 0.5-1% of niacinamide, 0.05-0.5% of ceramide NP, 0.4-1% of citrus fruit extract, 0.07-0.3% of scutellaria root extract, 0.3-0.6% of Glycyrrhiza inflata root extract, 0.3-0.6% of Sophora flavescens root extract, 5-15% of moisturizer, 0.5-1% of thickener, 0.5-2% of preservative, 0.5-1.5% of emulsifier and the balance of water.

[0012] Preferably, the essence comprises the following components in percentage by mass: 5% bitter melon concentrate, 0.1% Centella asiatica extract, 1% niacinamide, 0.3% ceramide NP, 0.5% citrus fruit extract, 0.2% scutellaria root extract, 0.5% glycyrrhiza inflata root extract, 0.5% sophora flavescens root extract, 11% moisturizer, 0.5% thickener, 1% preservative, 0.7% emulsifier and the balance water.

[0013] Through experimental research, it was found that when the components of the present invention are combined using the optimal dosage ratio specified above, the resulting facial mask essence has the best anti-inflammatory and soothing effect and the highest cost-effectiveness.

[0014] Preferably, the method for preparing the bitter melon concentrate comprises the following steps:

[0015] The fresh bitter melon is deseeded, squeezed, and filtered to obtain bitter melon juice, the bitter melon juice is subjected to low-temperature extraction, and then filtered through a 300-400 mesh filter cloth, the filtrate is centrifuged, and the supernatant is taken to obtain the bitter melon concentrate.

[0016] Preferably, the temperature of the low-temperature extraction is 60-80°C, and the time of the low-temperature extraction is 2-4 hours.

[0017] The present invention adopts the above-mentioned process method to prepare the bitter melon concentrate, which can retain the water-soluble active ingredient bitter melon saponin in the bitter melon to the greatest extent, thereby exerting a good anti-inflammatory and soothing effect, and the preparation process is short in time, high in extraction efficiency, and the clarity of the extract is good, which can effectively avoid the problems of the bitter melon water extract becoming dark and turbid, so that it can be better applied to anti-inflammatory and soothing products.

[0018] Preferably, the moisturizing agent includes at least one of butylene glycol, allantoin, arginine, caprylyl glycol, β-glucan, 1,2-pentanediol and polyglyceryl-10 stearate.

[0019] Preferably, the thickener comprises at least one of acrylic acid (esters) / C10-30 alkyl acrylate crosspolymer, xanthan gum and hydroxyethyl cellulose.

[0020] Preferably, the emulsifier includes at least one of PEG-40 hydrogenated castor oil, sucrose stearate and hydrogenated lecithin; and the preservative includes at least one of p-hydroxyacetophenone and 1,2-hexanediol.

[0021] In a second aspect, the present invention provides a method for preparing the bitter melon soothing and moisturizing facial mask, comprising the following steps:

[0022] S1. Add the preservative and moisturizer into an emulsifier, stir and mix at 30-50 rpm to obtain phase A, stir and disperse the thickener, and then homogenize at 2000-3000 rpm to obtain phase B, then mix phase B with phase A, heat to 80-85° C., and then homogenize at 2000-3000 rpm for 2-4 min, and keep warm for 25-35 min to obtain mixture I;

[0023] S2, mixing ceramide NP and emulsifier, heating to 80-85°C, stirring to dissolve, obtaining phase C, and then adding phase C to mixture I and mixing evenly to obtain mixture II;

[0024] S3. Mix bitter melon concentrate, niacinamide, scutellaria root extract, glycyrrhiza uralensis root extract, sophora flavescens root extract, citrus fruit extract and Centella asiatica extract to obtain phase D, then mix phase D with mixture II, stir evenly, filter and discharge the material under a pressure of 0.3-0.8 MPa to obtain essence, soak the mask cloth in the essence to obtain the bitter melon soothing and moisturizing mask.

[0025] When the mask of the present invention is used, the mask cloth is soaked in the essence liquid, and after being soaked, the mask is placed on the face for wet compressing for 15-20 minutes. After removing the mask, massage is continued until the essence liquid is completely absorbed.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) When the facial mask essence is prepared by combining anti-inflammatory and soothing ingredients such as Centella asiatica extract with bitter melon concentrate, the components interact and cooperate with each other, which can significantly enhance the anti-inflammatory and soothing effects of the facial mask. In particular, there is an obvious synergistic effect between the bitter melon concentrate and the Centella asiatica extract, Glycyrrhiza inflata root extract, and ceramide NP, thereby achieving multi-pathway and excellent anti-inflammatory and soothing effects of the soothing product, and satisfying consumers' skin care demands for overall comprehensive improvement of skin sensitivity.

[0028] (2) The present invention adopts low-temperature extraction technology to prepare bitter melon concentrate, which can retain the water-soluble active ingredient bitter melon saponin in bitter melon to the greatest extent, thereby exerting a good anti-inflammatory and soothing effect. In addition, the preparation process takes a short time, has a high extraction efficiency, and has good clarity of the extract, which can effectively avoid the problem that the bitter melon water extract becomes dark and turbid, so that it can be better applied to anti-inflammatory and soothing products. DETAILED DESCRIPTION

[0029] To better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments. It should be understood by those skilled in the art that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] Unless otherwise specified, all raw materials involved in the following examples and comparative examples are commercially available general materials.

[0031] The preparation method of the bitter melon concentrate of the present invention comprises the following steps:

[0032] Take fresh bitter melon, remove the seeds, wash with fresh distilled water, squeeze at low temperature, extract the juice, squeeze the residue again, combine the two juices, put the juice into a multifunctional extraction tank for low temperature extraction, the low temperature extraction temperature is 60-80°C, the low temperature extraction time is 2-4h, then take out and filter with a 400-mesh filter cloth, centrifuge the filtrate with a centrifuge, take the supernatant, and obtain the bitter melon concentrate.

[0033] Examples 1-7

[0034] Table 1: Formula of the essence in the bitter melon soothing and moisturizing mask described in Examples 1-7 (mass percentage %)

[0035]

[0036]

[0037] Comparative Examples 1-10

[0038] Table 2: Formula of the essence in the bitter melon soothing and moisturizing mask described in Comparative Examples 1-10 (mass percentage %)

[0039]

[0040]

[0041]

[0042] The preparation method of the bitter melon soothing and moisturizing facial mask described in Examples 1-7 and Comparative Examples 1-10 comprises the following steps:

[0043] S1. Add the preservative and moisturizer into an emulsifier, stir and mix at 30-50 rpm to obtain phase A, stir and disperse the thickener, and then homogenize at 2000-3000 rpm to obtain phase B, then mix phase B with phase A, heat to 80-85° C., and then homogenize at 2000-3000 rpm for 2-4 min, and keep warm for 25-35 min to obtain mixture I;

[0044] S2, mixing ceramide NP and emulsifier, heating to 80-85°C, stirring to dissolve, obtaining phase C, and then adding phase C to mixture I and mixing evenly to obtain mixture II;

[0045] S3. Mix bitter melon concentrate, niacinamide, scutellaria root extract, glycyrrhiza uralensis root extract, sophora flavescens root extract, citrus fruit extract and Centella asiatica extract to obtain phase D, then mix phase D with mixture II, stir evenly, filter and discharge the material under a pressure of 0.3-0.8 MPa to obtain essence, soak the mask cloth in the essence to obtain the bitter melon soothing and moisturizing mask.

[0046] Effect example

[0047] 1. Anti-inflammatory effect test:

[0048] The facial mask essences prepared in Examples 1-7 and Comparative Examples 1-10 were used as samples to test their anti-inflammatory efficacy (for IL-1α and IL-6) based on HaCat cells. The efficacy test concentration was determined by cytotoxicity testing, and an inflammatory model was established based on HaCat cells using LPS as a stimulus. Experiments were conducted on different test samples, and samples of the HaCat cells after the action were collected and tested using an enzyme-linked immunosorbent assay (ELISA). The specific operation method is as follows:

[0049] (1) Cell inoculation and preparation: HaCat cells were inoculated at a density of 2.0×10 5 -3.0×10 5 pc / mL / well were inoculated into 12-well plates and returned to the incubator for 18-24h;

[0050] (2) Administration: Prepare the test substances at different concentrations according to Table 3;

[0051] Table 3

[0052]

[0053]

[0054] (3) Collecting cell culture fluid: After the culture is completed, collect the cell culture fluid into a 1.5 mL Eppendorf tube, centrifuge to obtain the supernatant, and freeze it in a -80°C refrigerator for ELISA detection.

[0055] (4) Data analysis: The test results are expressed as mean ± standard deviation, and the data are analyzed using SPSS. The specific results are shown in Table 4-5.

[0056] Table 4 IL-1α content detection results

[0057] Sample source IL-1α content Sample source IL-1α content Blank control group 100 Comparative Example 1 164.13±8.12 LPS model group 198.36±5.02 Comparative Example 2 157.82±9.66 Example 1 119.23±5.26 Comparative Example 3 147.87±8.5 Example 2 138.76±7.29 Comparative Example 4 156.15±7.23 Example 3 134.56±8.23 Comparative Example 5 173.61±9.15 Example 4 131.45±6.95 Comparative Example 6 175.82±8.91 Example 5 128.19±7.82 Comparative Example 7 182.73±10.34 Example 6 125.27±6.15 Comparative Example 8 180.81±9.25 Example 7 123.21±7.38 Comparative Example 9 179.33±7.98 Comparative Example 10 145.18±7.59

[0058] Table 5 IL-6 content detection results

[0059]

[0060]

[0061] The results in Tables 4-5 show that the facial mask essences prepared in Examples 1-7 can effectively reduce the content of IL-1α and IL-6 anti-inflammatory factors, thereby achieving a good anti-inflammatory effect, especially the facial mask essence prepared in Example 1 has the best anti-inflammatory effect. When any one or more of the four active ingredients of bitter melon concentrate, Centella asiatica extract, ceramide NP and Glycyrrhiza inflata root extract are missing in Comparative Examples 1-8, the anti-inflammatory effect of the prepared facial mask essence is significantly reduced compared with the embodiments; and when the dosage ratio of the four components in Comparative Examples 9-10 exceeds the specified range of the present invention, the anti-inflammatory effect of the prepared facial mask essence is also reduced; the above results show that the bitter melon concentrate and Centella asiatica extract, Glycyrrhiza inflata root extract, and ceramide NP in the facial mask essence of the present invention have obvious synergistic effects when they are within a specific dosage range, thereby maximizing the anti-inflammatory effect of the facial mask, and none of the four components is indispensable.

[0062] 2. Safety test:

[0063] The facial mask essences prepared in Examples 1-7 and Comparative Examples 1-10 were used as samples to test their safety, and the specific method is as follows.

[0064] Test number: 30 people, 5 males, 25 females, aged 20-55 years old. And the volunteers meet the selection criteria for subjects in human skin patch tests in the "Technical Specifications for Safety of Cosmetics" (2015 edition).

[0065] Test method: The facial mask essences prepared in Examples 1-7 and Comparative Examples 1-10 were subjected to patch tests. Qualified patch test equipment was selected and a closed patch test method was used. About 0.020-0.025 ml of the test substance was placed in the patch tester. Medical tape was applied to the curved side of the subject's forearm. The palm of the hand was used to gently press the test substance to evenly apply it to the skin. The test substance patch tester was removed after 24 hours. The skin reaction was observed at 0.5, 24, and 48 hours after the removal of the test substance patch tester, and the results were recorded according to the skin reaction grading standards in the "Technical Specification for Safety of Cosmetics" (2015 edition).

[0066] The results of the human skin patch test showed that there were no positive reactions in 30 people. According to the Technical Specifications for Safety of Cosmetics (2015 edition), the test substance will not cause adverse skin reactions and the sample is safe and non-irritating.

[0067] 3. Moisturizing effect test:

[0068] The facial mask essences prepared in Examples 1-7 and Comparative Examples 1-10 were used as samples to test their moisturizing effects, and the specific method is as follows.

[0069] (1) Subjects: 170 volunteers with healthy skin, no history of skin diseases or allergies were selected, including 25 males and 145 females, aged 20-40 years old. They were divided into 17 groups, with 10 subjects in each group. The facial mask essences of the embodiment and the comparative example were used to test the moisturizing effect.

[0070] (2) Test method: Have volunteers perform the test at room temperature and a relative humidity of about 50%. Select an appropriate area of ​​the volunteer's forearm flexion as the test area. 10 minutes before the test, the test site was exposed, and the stratum corneum hydration and transepidermal water loss were measured using a Corneometer CM825 skin moisture tester, with the test value before applying the essence as a control. Then, after applying the mask essence of different embodiments and comparative examples, the skin hydration was measured to calculate the skin hydration change rate, and the final test average of each group of results was taken. The specific results are shown in Table 6.

[0071] Skin hydration change rate = (skin hydration during test - skin hydration before test) / skin hydration before test × 100%

[0072] Table 6

[0073] Sample source 30min 1h 3h Sample source 30min 1h 3h Example 1 8.3％ 13.5％ 35.3％ Comparative Example 3 3.1％ 7.8％ 14.8％ Example 2 5.1％ 10.2％ 27.8％ Comparative Example 4 3.7％ 8.5％ 17.1％ Example 3 5.4％ 10.8％ 29.5％ Comparative Example 5 2.8％ 6.9％ 12.6％ Example 4 6.3％ 11.8％ 30.4％ Comparative Example 6 2.5％ 6.8％ 12.3％ Example 5 6.6％ 12.1％ 32.5％ Comparative Example 7 1.6％ 5.8％ 10.4％ Example 6 7.9％ 12.8％ 33.6％ Comparative Example 8 1.8％ 6.4％ 11.2％ Example 7 8.0％ 12.9％ 34.4％ Comparative Example 9 2.0％ 6.3％ 11.1％ Comparative Example 1 3.3％ 8.1％ 15.3％ Comparative Example 10 4.8％ 9.2％ 25.1％ Comparative Example 2 3.5％ 8.5％ 15.8％

[0074] 4. Soothing effect test:

[0075] 102 subjects aged 20-45 were selected. The subjects had no serious systemic diseases, no immunodeficiency or autoimmune diseases, no history of allergies to skin care cosmetics, and had not used hormone drugs and immunosuppressants systemically within 1 month. The subjects were divided into 18 groups, 6 people in each group, and the facial masks described in Examples 1-7 and Comparative Examples 1-10 of the present invention were tried respectively. The specific method is as follows:

[0076] The subjects sat quietly for 30 minutes in a constant temperature and humidity environment, where the temperature was 21±1℃ and the humidity was 40-60%. Mark the inner side of the subject's arm about 4 cm 2 Area, absorb 20μL of 2% histamine solution on the marked area, apply it evenly and observe, and those with obvious redness and swelling within 20 minutes are qualified subjects. Each group of 6 subjects applied histamine solution on their arms respectively. When itching and slight redness and swelling occurred, the mask cloth was immersed in the essence, and the mask was wet applied to the red and swollen area for testing. The skin changes were observed for 10min, 60min and 90min, and the subjects were asked to score the soothing effect of the composition after 90min, and the test scores of each group were averaged; among them, 9-10 points: very good soothing effect for itching and tingling, 7-8 points: good soothing effect for itching and tingling, 5-6 points: general soothing effect for itching and tingling, 3-4 points: poor soothing effect for itching and tingling, 1-2 points: very poor soothing effect for itching and tingling. The specific test results are shown in Table 7.

[0077] Table 7

[0078]

[0079] It can be seen from the results in Tables 6-7 that the facial masks prepared in Examples 1-7 have excellent soothing and moisturizing effects, can effectively reduce the itching and tingling caused by skin irritation, while repairing and maintaining the skin's barrier function and improving the skin's moisturizing properties. The soothing and moisturizing effects of the compositions prepared in the comparative examples are significantly reduced compared to those in the examples.

[0080] Finally, it should be noted that the above embodiments are intended to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A soothing and moisturizing facial mask of bitter melon, comprising an essence and a facial mask cloth, characterized in that: The essence comprises the following components in percentage by weight: 2-10% of bitter melon concentrate, 0.05-0.2% of Centella asiatica extract, 0.1-1.5% of niacinamide, 0.01-1% of ceramide NP, 0.1-2% of citrus fruit extract, 0.05-0.5% of scutellaria root extract, 0.1-0.8% of Glycyrrhiza inflata root extract, 0.1-0.8% of Sophora flavescens root extract, 5-15% of moisturizer, 0.5-1% of thickener, 0.5-2% of preservative, 0.5-1.5% of emulsifier and the balance of water.

2. The balsam pear soothing and moisturizing facial mask according to claim 1, characterized in that: The essence comprises the following components in percentage by weight: 4-7% of bitter melon concentrate, 0.08-0.15% of Centella asiatica extract, 0.5-1% of niacinamide, 0.05-0.5% of ceramide NP, 0.4-1% of citrus fruit extract, 0.07-0.3% of scutellaria root extract, 0.3-0.6% of Glycyrrhiza inflata root extract, 0.3-0.6% of Sophora flavescens root extract, 5-15% of moisturizer, 0.5-1% of thickener, 0.5-2% of preservative, 0.5-1.5% of emulsifier and the balance of water.

3. The balsam pear soothing and moisturizing facial mask according to claim 2, characterized in that: The essence comprises the following components in percentage by weight: 5% of bitter melon concentrate, 0.1% of Centella asiatica extract, 1% of niacinamide, 0.3% of ceramide NP, 0.5% of citrus fruit extract, 0.2% of Scutellaria baicalensis root extract, 0.5% of Glycyrrhiza inflata root extract, 0.5% of Sophora flavescens root extract, 11% of moisturizer, 0.5% of thickener, 1% of preservative, 0.7% of emulsifier and the balance of water.

4. The balsam pear soothing and moisturizing facial mask according to any one of claims 1 to 3, characterized in that: The preparation method of the bitter melon concentrate comprises the following steps: The fresh bitter melon is deseeded, squeezed, and filtered to obtain bitter melon juice, the bitter melon juice is subjected to low-temperature extraction, and then filtered through a 300-400 mesh filter cloth, the filtrate is centrifuged, and the supernatant is taken to obtain the bitter melon concentrate.

5. The balsam pear soothing and moisturizing facial mask according to claim 4, characterized in that: The temperature of the low-temperature extraction is 60-80°C, and the time of the low-temperature extraction is 2-4h.

6. The balsam pear soothing and moisturizing facial mask according to any one of claims 1 to 3, characterized in that: The moisturizing agent includes at least one of butylene glycol, allantoin, arginine, caprylyl glycol, β-glucan, 1,2-pentanediol and polyglyceryl-10 stearate.

7. The balsam pear soothing and moisturizing facial mask according to any one of claims 1 to 3, characterized in that: The thickener includes at least one of acrylic acid (esters) / C10-30 alkyl acrylate cross-linked polymer, xanthan gum and hydroxyethyl cellulose.

8. The balsam pear soothing and moisturizing facial mask according to any one of claims 1 to 3, characterized in that: The emulsifier includes at least one of PEG-40 hydrogenated castor oil, sucrose stearate and hydrogenated lecithin; The preservative includes at least one of p-hydroxyacetophenone and 1,2-hexanediol.

9. The method for preparing the bitter melon soothing and moisturizing facial mask according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Add the preservative and moisturizer into an emulsifier, stir and mix at 30-50 rpm to obtain phase A, stir and disperse the thickener, and then homogenize at 2000-3000 rpm to obtain phase B, then mix phase B with phase A, heat to 80-85° C., and then homogenize at 2000-3000 rpm for 2-4 min, and keep warm for 25-35 min to obtain mixture I; S2, mixing ceramide NP and emulsifier, heating to 80-85°C, stirring to dissolve, obtaining phase C, and then adding phase C to mixture I and mixing evenly to obtain mixture II; S3. Mix bitter melon concentrate, niacinamide, scutellaria root extract, glycyrrhiza uralensis root extract, sophora flavescens root extract, citrus fruit extract and Centella asiatica extract to obtain phase D, then mix phase D with mixture II, stir evenly, filter and discharge the material under a pressure of 0.3-0.8 MPa to obtain essence, soak the mask cloth in the essence to obtain the bitter melon soothing and moisturizing mask.

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