CN113749953A - Double-layer shower gel with stable milk cover layer and preparation method thereof - Google Patents

Abstract

The invention belongs to the field of daily chemicals and discloses a double-layer shower gel with a stable milk cover layer and a preparation method thereof. The double-layer shower gel comprises the following components in percentage by weight: 10.5-20% of anionic surfactant, 0.8-1.2% of nonionic surfactant, 1.5-2.5% of zwitterionic surfactant, 14-24% of grease and 50-75% of water. The upper milk cover layer in the double-layer shower gel has good stability, can form a double-layer structure with a clear interface with the lower water layer, and is not changed after being placed for more than one year at room temperature.

Description

Double-layer shower gel with stable milk cover layer and preparation method thereof

Technical Field

The invention belongs to the field of daily chemicals, and particularly relates to a double-layer shower gel with a stable milk cover layer and a preparation method thereof.

Background

The shower gel product is one of common daily chemical products and is closely related to the daily life of people. For shower gel products, the more novel the appearance of the contents is, the higher the color value is, and the more popular the shower gel products are to consumers. With the change of times, products with the appearance of a milk cap are more popular with consumers, and the existing shower gel products are generally single-layer systems formed by emulsifying and mixing water phases and oil phases. Although there have been some enterprises in the industry that try to develop a bath cream product having a two-layer structure and an emulsified milk cover layer as an upper layer, such a product cannot form a milk cover layer on the upper layer of the formed two-layer structure; or the milk cover layer stability that the upper strata formed is relatively poor, and the upper strata milk cover layer becomes transparent oil reservoir easily along with the extension of time, or is unclear with the interface of lower floor's water layer, takes place the integration easily, and above-mentioned circumstances all can make this bilayer structure's aesthetic feeling destroyed.

Therefore, the invention aims to provide a double-layer shower gel with a stable milk cover layer to meet the actual demands of consumers and markets.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art described above. Therefore, the invention provides the double-layer shower gel with the stable milk cover layer and the preparation method thereof, wherein the upper milk cover layer in the double-layer shower gel has good stability, can form a double-layer structure with a clear interface with a lower water layer, and is not changed after being placed for more than one year at room temperature (18-25 ℃).

The invention provides a double-layer shower gel which comprises the following components in percentage by weight: 10.5-20% of anionic surfactant, 0.8-1.2% of nonionic surfactant, 1.5-2.5% of zwitterionic surfactant, 14-24% of grease and 50-75% of water.

The tests of the invention show that the milk cover layer in the double-layer shower gel has good stability only by the cooperation of three surfactants and grease, even if a nonionic surfactant or a zwitterionic surfactant with small addition amount is necessary, the stability can be obviously reduced if any surfactant is absent. Tests have further shown that the amount of each type of surfactant should be strictly controlled, and that exceeding the above range not only does not form a stable milk cover layer, but also degrades the interface definition of the upper and lower layers, resulting in poor appearance.

Preferably, the anionic surfactant is selected from at least one of sodium lauroyl sarcosinate, sodium cocoamidopropionate, disodium cocoyl glutamate, potassium cocoyl glycinate or sodium methyl stearoyl taurate.

Preferably, the nonionic surfactant is selected from cocoamide methyl MEA and/or decyl glucoside.

Preferably, the zwitterionic surfactant is cocamidopropyl betaine and/or sodium lauroamphoacetate.

Preferably, the grease is at least one selected from white oil, hydrogenated polyisobutene or octyldodecanol myristate. In the surfactant system used in the invention, the grease is selected to be matched with the surfactant system, so that good skin feel and anti-dry-sensitive effect can be achieved. If other kinds of conventional greases are used, for example: the isomeric hexadecane is not sufficient for moistening and moisturizing, and the skin feels astringent; the polydimethylsiloxane is used, so that the residual feeling is heavy, and the washing is not clean; the skin feel is too oily and the experience feel is not good when isopropyl myristate is used.

More preferably, the oil or fat is selected from the group consisting of white oil, hydrogenated polyisobutene, and octyldodecanol myristate. By compounding the three kinds of grease, the skin feeling and the anti-dry sensitivity performance can be effectively enhanced.

Preferably, the double-layer shower gel further comprises at least one of a humectant, a preservative, a chelating agent, a pH regulator or a perfume.

More preferably, the humectant is selected from at least one of betaine, polyethylene glycol, trehalose, or sodium pyrrolidone carboxylate (sodium PCA).

More preferably, the pH adjusting agent is selected from citric acid and/or sodium citrate.

The invention also provides a preparation method of the double-layer shower gel, which comprises the following steps:

(1) mixing water and a chelating agent, adding an anionic surfactant, a nonionic surfactant and a zwitterionic surfactant, stirring and heating to obtain a premix A;

(2) adding grease into the premix A and stirring to obtain a premix B;

(3) and cooling the premix B, adding a humectant, essence and a pH regulator, and stirring to obtain the double-layer shower gel.

Preferably, the heating in step (1) is carried out to a temperature of 75-85 ℃.

Preferably, the temperature of the premix B in the step (3) is reduced to 42-48 ℃.

Preferably, the pH is adjusted to 5.5-6.5 in step (3) using the pH adjuster.

Compared with the prior art, the invention has the following beneficial effects:

(1) the double-layer shower gel can form a double-layer structure with a milky white milk cover layer on the upper layer and a transparent water layer on the lower layer, and the interface between the milk cover layer on the upper layer and the water layer on the lower layer is clear; the double-layer structure has good stability, and does not change after being placed at room temperature (18-25 ℃) for one year;

(2) the double-layer shower gel has good effects of moistening, moisturizing, anti-allergy, anti-pruritus and the like, enhances the moisturizing capability of skin by repairing the natural barrier of the skin, achieves the water-oil balance of the skin, and is non-irritant, safe and mild to the skin of a human body;

(3) the preparation method of the double-layer shower gel composition is simple and convenient, has high safety and lower cost, and is suitable for industrial large-scale production.

Drawings

FIG. 1 shows the appearance of the shower gel products prepared in comparative example 3 (shown in the left bottle) and example 1 (shown in the right bottle) after 6 months at room temperature (25 ℃).

Detailed Description

In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are only preferred embodiments of the present invention, and the claimed protection scope is not limited thereto, and any modification, substitution, combination made without departing from the spirit and principle of the present invention are included in the protection scope of the present invention.

The starting materials, reagents or apparatuses used in the following examples are conventionally commercially available or can be obtained by conventionally known methods, unless otherwise specified.

Examples 1 to 3

Table 1 below is the formulation composition (in weight percent) of the two-layer body wash of examples 1-3.

Table 1 formula of the two-layer shower gel in examples 1-3

The preparation method of the two-layer shower gel in examples 1 to 3 comprises the following steps:

(1) adding water and a chelating agent into an emulsifying pot, homogenizing and stirring, adding an anionic surfactant, homogenizing and stirring, uniformly dispersing, and heating to 80-85 ℃ to obtain a premix A;

(2) adding a nonionic surfactant and a zwitterionic surfactant into the premix A, uniformly stirring, adding grease, homogenizing, stirring for 15min, and preserving heat for 20min to obtain a premix B;

(3) and cooling the premix B to 45 ℃, adding the humectant, the essence and the pH regulator, uniformly stirring, and cooling to 37 ℃ to obtain the double-layer shower gel.

Comparative examples 1 to 7

The following table 2 is the formulation composition (in weight percent) of the two-layer body wash of comparative examples 1-7.

Table 2 formula table of comparative examples 1 to 7 of two-layer shower gel

The two-layer body washes of comparative examples 1-7 were prepared in the same manner as in examples 1-3.

Comparative example 1: in contrast to example 1, comparative example 1 did not contain an anionic surfactant, and the amount of the anionic surfactant added was replaced with a nonionic surfactant and a zwitterionic surfactant.

Comparative example 2: in comparison with example 1, comparative example 2 does not contain a nonionic surfactant, and the amount of the nonionic surfactant added is replaced with an anionic surfactant and a zwitterionic surfactant.

Comparative example 3: in contrast to example 1, comparative example 3 did not contain a zwitterionic surfactant, and the amount of the zwitterionic surfactant added was replaced with an anionic surfactant and a nonionic surfactant.

Comparative example 4: in comparison with example 1, the anionic surfactant in comparative example 4 accounts for 27.8 wt%, which is out of the range.

Comparative example 5: compared with example 1, the weight percentage of the nonionic surfactant in comparative example 5 is 2.5%, which is out of the range.

Comparative example 6: in comparison with example 1, comparative example 6 has zwitterionic surfactant accounting for 4% by weight, outside the dosage range.

Comparative example 7: in comparison with example 1, the amount of the fat in comparative example 7 was 10%, which is less than the amount range.

Product effectiveness testing

Human body patch test

1. The test substance: the shower gel of examples 1-3 and the shower gel of comparative examples 1-7 of the invention;

2. subject: selecting volunteers with age of 20-55 years and according with volunteer selection criteria of the subject;

3. the test method comprises the following steps: placing the tested object in a proper spot sticking device by adopting a closed test method, sticking the tested object on the arm curve side of the tested object by using a hypoallergenic adhesive tape, and lightly pressing the tested object by using a palm to uniformly stick the tested object on the skin for 24 hours; the blank control group was subject without product;

4. and (4) observing results: the test substances were removed after 24 hours, the skin reactions were observed after 0.5h, 24h, 48h, respectively, and the reaction results were recorded. The grade of the adverse reaction of the skin is shown in Table 3, and the test results are shown in Table 4.

TABLE 3 skin response grading Standard for skin Enclosed Patch test

TABLE 4 test results of human skin patches

The results in Table 4 show that no adverse reaction occurred in the remaining examples and comparative examples except comparative example 4 and comparative example 5. The results show that the addition of the surfactant in an over-range mode can stimulate the human body, and the bath lotion formula which is safe and mild to the skin and has small irritation can be prepared only by adding the surfactant in a reasonable range.

Experiment of corrosion prevention challenge

Preservative challenge experiments (experiments were performed according to the methods of the european pharmacopoeia (EP7.0) and the test results are shown in table 5 below).

TABLE 5 Corrosion challenge test

As can be seen from Table 5, the two-layer body wash in examples 1 to 3 of the present invention simulates microbial contamination during the production and use of cosmetics by performing a corrosion prevention challenge test, so as to avoid possible damage to consumers during the product use, and the results show that the body wash prepared in examples 1 to 3 has good safety.

Evaluation of instrument efficacy and human body sense evaluation

Qualitative and quantitative measurement and analysis of characteristics of different dimensions of sample by instrument and sense

220 volunteers were recruited, grouped randomly after grouping, each group of 20 volunteers continuously used each group of body wash for 4 weeks, testers scored according to the use feeling, and the effect of the test subject was revisited every 1 week. The scoring criteria used were 10 points, 1 point-degree very low, 3 point-degree low, 5 point-degree generally high, 7 point-degree high, 10 point-degree very high. Improvement of scales (no improvement on 0 scale and obvious improvement on 10 scale); foam richness scores (0 score no foam, 10 score foam rich); the tightness scores (0 score for very tight and 10 score for not tight) and the itching condition improved (0 score for no improvement and 10 score for significant improvement), and the final test evaluation results are shown in table 6.

TABLE 6 Instrument efficacy evaluation and human body sensory evaluation results

As can be seen from table 6, compared with the commercially available shower gel a, the two-layer shower gel prepared in examples 1 to 3 of the present invention has significant advantages, significantly improved appearance novelty, foam richness and moisture retention, and significantly improved degree of itching and scales, and thus is generally preferred by the subjects.

Comparative examples 1 to 3 are different from example 1 in the surfactant, and the use effects in the aspects of the appearance, the richness of the foam, the overall evaluation and the like of the shower gel products prepared in comparative examples 1 to 3 are poor.

Comparative examples 4 to 6 differ from example 1 in that the surfactant was included in an amount exceeding the range, and the moisturizing effect, the degree of itching, the scale, the feeling upon use, and the like were less marked.

Comparative example 7 differs from example 1 in that the oil content is less than the range of the amount used, and the score is poor in terms of moisture retention, appearance, tightness, and the like.

Milk overlay appearance and stability comparison

The shower gel products prepared in examples 1 to 3 can form a double-layer structure of an upper milky white cover layer and a lower transparent layer, and the interfaces of the upper layer and the lower layer are clear. The shower gel products prepared in the examples 1 to 3 are placed for one year at room temperature or 3 months at 48 ℃, and the appearance structure of the shower gel products is not changed.

Compared with the example 1, the shower gel product prepared in the comparative example 1 has the advantages that the milk cover layer on the upper layer is reduced, the milk cover layer is unstable, the boundary between the milk cover layer on the upper layer and the shower gel on the lower layer is fuzzy in a short time, and the lower layer is turbid; the upper layer is easy to become transparent grease layer after long-time standing, namely the upper transparent grease layer and the lower bath dew layer are formed. In comparative example 1, when the bath was exposed to ambient temperature for 3 months or 48 ℃ for more than 15 days, the milk layer began to turn into a transparent oil layer. Although the shower gel products prepared in comparative examples 2 to 3 can form the milk cap layer, the interface of the milk cap layer on the shower gel layer is fuzzy, the layering time of the milk cap is short, the shower gel products are not suitable for daily large-scale production and filling, and the using sense is poor, so that the practical requirements cannot be met.

Compared with the example 1, the surfactant in the shower gel products prepared in the comparative examples 4 to 6 exceeds the dosage range, although the milk cover layer can be formed, the interface between the upper milk cover layer and the lower water layer is not clear, the appearance effect is poor, and the actual requirement cannot be met.

FIG. 1 is a graph showing the appearance of the shower cream products prepared in comparative example 3 (left bottle in FIG. 1) and example 1 (right bottle in FIG. 1) after being left at room temperature (25 ℃ C.) for 6 months. It can be seen that the upper milk cover layer in comparative example 1 has disappeared and turned into a transparent oil layer, whereas the upper milk cover layer in example 1 can be kept stable without change at all times.

The results show that the shower gel product prepared by the embodiment of the invention has good use feeling and has the effects of moisturizing, resisting pruritus, resisting scale and the like; the shower gel product also has an upper milky white milk cover layer and a novel double-layer structure of a lower transparent water layer, the interfaces of the upper layer and the lower layer are clear, and the shower gel product has good stability and can not change the structure in the service life of the product.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

Claims (10)

1. The double-layer shower gel is characterized by comprising the following components in percentage by weight: 10.5-20% of anionic surfactant, 0.8-1.2% of nonionic surfactant, 1.5-2.5% of zwitterionic surfactant, 14-24% of grease and 50-75% of water.

2. The double layer body wash of claim 1, wherein the anionic surfactant is selected from at least one of sodium lauroyl sarcosinate, sodium cocoamidopropionate, disodium cocoyl glutamate, potassium cocoyl glycinate, or sodium methyl stearoyl taurate.

3. The double body wash according to claim 1, wherein the non-ionic surfactant is selected from cocoamide methyl MEA and/or decyl glucoside.

4. The double-layer body wash according to claim 1, characterized in that the zwitterionic surfactant is cocamidopropyl betaine and/or sodium lauroamphoacetate.

5. The double-layer body wash according to claim 1, wherein the oil is at least one selected from white oil, hydrogenated polyisobutene, or octyldodecanol myristate.

6. The double-layer body wash according to claim 1, further comprising at least one of a humectant, a preservative, a chelating agent, a pH regulator or a fragrance.

7. The double-layer body wash according to claim 6, wherein the humectant is selected from at least one of betaine, polyethylene glycol, trehalose, or sodium pyrrolidone carboxylate.

8. The method for preparing the double-layer body wash as claimed in claim 6 or 7, which is characterized by comprising the following steps:

(1) mixing water and a chelating agent, adding an anionic surfactant, a nonionic surfactant and a zwitterionic surfactant, stirring and heating to obtain a premix A;

(2) adding grease into the premix A and stirring to obtain a premix B;

(3) and cooling the premix B, adding a humectant, essence and a pH regulator, and stirring to obtain the double-layer shower gel.

9. The method according to claim 8, wherein the heating is performed to 75 to 85 ℃ in step (1).

10. The production method according to claim 8, wherein the pH is adjusted to 5.5 to 6.5 in step (3) using the pH adjuster.

Images