Liquid foundation containing colloidal sulfur and preparation method thereof

Abstract

The invention relates to the field of new daily chemical materials, in particular to a colloidal sulfur-containing liquid foundation preparation method which comprises the following steps: step 1, emulsifying a raw material mixture containing an emulsifier, an emollient, a film-forming agent, a filling agent, a thickening agent, a coloring agent and a humectant to prepare a water-in-oil emulsion; the emulsification temperature is 65-75 DEG C; 2, cooling the water-in-oil emulsion obtained in the step 1 until the temperature is lower than 50 DEG C, adding colloidal sulfur, and mixing; 3, continuously cooling the product obtained in the step 2 to room temperature; the emulsifier does not contain silicone oil emulsifiers. The liquid foundation adopts an emulsification system without a silicone oil emulsifier, and in order to overcome the damage of colloidal sulfur to the stability of the emulsification system, the colloidal sulfur is added in an emulsification cooling stage, so that the stability of the system can be kept; meanwhile, the invention also finds that the use amount of the film-forming agent can be reduced by using the colloidal sulfur, so that the air permeability is improved, and the same makeup holding ability is maintained.

Description

Technical Field

[0001] The present invention relates to the field of new daily chemical materials, and in particular to a liquid foundation containing colloidal sulfur and a preparation method thereof. Background Art

[0002] Colloidal sulfur is composed of 25% gum arabic wrapped in 75% sulfur. Its effects are widely known, including: oil control and acne treatment, anti-inflammatory and antibacterial, moisturizing, repairing and anti-oxidation.

[0003] The morphological characteristic of colloidal sulfur is that the sulfur is wrapped by gum arabic, which can prevent the sulfur from agglomerating in the water phase and can be evenly suspended in the water phase, thereby improving the dispersion effect of the sulfur.

[0004] However, the application of colloidal sulfur in foundation is not common. The specific solutions are as follows:

[0005] Publication number CN118021628B is a patent application for a readily dispersible sulfur microcapsule, its preparation method, and its application. The main purpose is to improve the dispersibility of colloidal sulfur. The main method used is: triple coating to improve the dispersibility of colloidal sulfur; namely, triple coating of gum arabic, silicone elastomer, and xanthan gum;

[0006] This is indeed an effective method, but commercially available colloidal sulfur is generally coated with gum arabic and has good suspension properties in the aqueous phase.

[0007] The application of colloidal sulfur in liquid foundation has not been reported.

[0008] Compared with oil-in-water liquid foundation, oil-in-water liquid foundation has its own advantages based on the different dosage forms. Among them, oil-in-water liquid foundation has the advantages of lighter texture, breathability, and strong oil control ability, which is suitable for oily skin and summer use; oil-in-water liquid foundation is relatively thick, with better moisturizing ability, makeup lasting ability, and blemish concealing ability, but poor breathability, suitable for dry skin, not very suitable for oily skin.

[0009] A film-forming agent is an essential ingredient in liquid foundation, and reducing its content can improve oil control. However, this can also reduce the staying power and concealing power of heavier, oil-in-water foundations.

[0010] Therefore, it is very difficult to develop a green oil-in-water foundation that can achieve good breathability and long-lasting concealing effects, especially the stability of the emulsion.

[0011] This project aims to solve the following problems:

[0012] 1. Can colloidal sulfur be added to liquid foundation? Can it have other functions besides sterilization?

[0013] 2. In previous studies, we have found that colloidal sulfur can seriously damage the stability of green-source emulsifier systems. How can we make colloidal sulfur adapt to this specific emulsification system? Summary of the Invention

[0014] To address the above-mentioned issues, the present invention provides a method for preparing a liquid foundation containing colloidal sulfur. The liquid foundation utilizes an emulsifying system that does not contain silicone oil emulsifiers. To overcome the destabilizing effect of colloidal sulfur on the emulsifying system, colloidal sulfur is added during the emulsification and cooling phase to maintain system stability. Furthermore, this project has found that the use of colloidal sulfur can reduce the amount of film-forming agent used, thereby improving breathability and maintaining the same long-lasting makeup effect.

[0015] At the same time, the invention also discloses the liquid foundation.

[0016] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0017] A method for preparing a liquid foundation containing colloidal sulfur comprises the following steps:

[0018] Step 1: emulsifying a raw material mixture containing an emulsifier, an emollient, a film former, a filler, a thickener, a colorant, and a humectant to prepare a water-in-oil emulsion; the emulsification temperature is 65-75° C.;

[0019] Step 2: Cooling the water-in-oil emulsion of step 1 to below 50° C., adding colloidal sulfur and mixing;

[0020] Step 3: Continue cooling the product obtained in step 2 to room temperature;

[0021] The emulsifier does not contain silicone oil emulsifier;

[0022] The emulsifier includes a first emulsifier;

[0023] The first emulsifier is polyglyceryl-3 polyricinoleate, polyglyceryl-3 oleate, glyceryl behenate, and polyglyceryl-6 octastearate; wherein the amount of polyglyceryl-3 polyricinoleate and polyglyceryl-3 oleate is equivalent to 2.5-3wt% of the total weight of the liquid foundation; the amount of glyceryl behenate and polyglyceryl-6 octastearate is equivalent to 0.1-0.5wt% of the total weight of the liquid foundation.

[0024] The advantages of the present invention are:

[0025] 1. No silicone oil emulsifier is used, which is more environmentally friendly;

[0026] 2. By adding colloidal sulfur during the cooling stage, the effect of adding colloidal sulfur in the early stage on the stability of the emulsification system is overcome;

[0027] 3. During the experiment, it was found that if colloidal sulfur is used and the system is stable, the amount of film-forming agent used can be reduced;

[0028] In oil-in-water foundations, the secretion of oil from the skin will cause the foundation to "melt", so a film-forming agent must be used. The film-forming agent not only improves the lasting effect of the makeup, but also blocks the outside air, preventing the oil from oxidizing too quickly, and keeping the skin refreshed. However, too much film-forming agent can cause skin acne, increase the difficulty of makeup removal, and have a negative impact on the skin barrier function, which is not conducive to skin health.

[0029] By introducing colloidal sulfur, the "melting" phenomenon of foundation caused by oil can be reduced, and thus the "melting" phenomenon of foundation can be inhibited without too much film-forming agent. The amount of film-forming agent used can be reduced, the breathability of foundation can be improved, the difficulty of makeup removal can be reduced or alleviated, and the phenomenon of acne can be reduced.

[0030] In the above preparation method, the emulsifier further includes a second emulsifier, and the second emulsifier is sorbitan sesquioleate, and the second emulsifier is equivalent to 0.5 to 1.5 wt % of the total weight of the liquid foundation.

[0031] In the above preparation method, the amount of the emulsifier used is equivalent to 3.5-4.5 wt % of the total weight of the liquid foundation.

[0032] In the above preparation method, the emollient is one or more combinations of squalane, neopentyl glycol diheptanoate, C10-18 fatty acid triglycerides, isononyl isononanoate, caprylic / capric triglyceride, and C15-19 alkanes; the emollient is equivalent to 25 to 35 wt% of the total weight of the liquid foundation.

[0033] In the above preparation method, the filler is one or more combinations of polydimethylsiloxane, polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer, and silica; the filler is equivalent to 3-4wt% of the total weight of the liquid foundation; the film-forming agent is trimethylsiloxysilicate; the film-forming agent is equivalent to 3-4wt% of the total weight of the liquid foundation; the colorant is one or more combinations of CI 77891, CI 77492, CI 77491, and CI 77499; the colorant is equivalent to 12-15wt% of the total weight of the liquid foundation; the thickener is one or more combinations of isododecane, disteardimonium hectorite, and propylene carbonate; the thickener is equivalent to 3-5wt% of the total weight of the liquid foundation.

[0034] In the above preparation method, the moisturizing agent is one or more combinations of dipropylene glycol, glycerin, caprylyl glycol, ethylhexylglycerin, 1,3-propylene glycol, 1,2-hexanediol, caprylhydroxamic acid, and glyceryl caprylate; the moisturizing agent is equivalent to 8-10wt% of the total weight of the liquid foundation; and further includes a stabilizer and / or fragrance, the stabilizer is one or more combinations of magnesium sulfate and sodium chloride; the stabilizer is equivalent to 0.1-0.5wt% of the total weight of the liquid foundation.

[0035] In the above preparation method, the colloidal sulfur is equivalent to 2 to 4 wt% of the total weight of the liquid foundation;

[0036] The water content in the liquid foundation is 25-40 wt %.

[0037] In the above-mentioned preparation method, the method is specifically as follows:

[0038] Step 1: Add the first emulsifier, at least part of the emollient, and the filler into a reaction vessel and disperse them evenly at 65-75° C.;

[0039] Step 2: Add the film-forming agent to the system of step 1;

[0040] Step 3: Grind the second emulsifier and colorant and add them to the system of step 2;

[0041] Step 4: Pre-disperse water and moisturizer and add them into the system of step 3 for emulsification;

[0042] Step 5: Homogenize the mixture from step 4;

[0043] Step 6: Cool down to 40-50°C, add colloidal sulfur, and stir to mix;

[0044] The first emulsifier is polyglyceryl-3 polyricinoleate, polyglyceryl-3 oleate, glyceryl behenate, and polyglyceryl-6 octastearate;

[0045] Wherein, the amount of polyglyceryl-3 polyricinoleate and polyglyceryl-3 oleate is equivalent to 2.5-3wt% of the total weight of the liquid foundation;

[0046] The amount of glyceryl behenate and polyglyceryl-6 octastearate is equivalent to 0.1 to 0.5 wt% of the total weight of the liquid foundation;

[0047] The second emulsifier is sorbitan sesquioleate, and the second emulsifier is equivalent to 0.5-1.5 wt % of the total weight of the liquid foundation.

[0048] In the above preparation method, the homogenization speed in step 5 is 5000-6000 rpm, and the homogenization time is 8-12 min.

[0049] At the same time, the present invention also discloses a liquid foundation containing colloidal sulfur, which is prepared by any of the above methods.

[0050] The beneficial effects of the present invention are:

[0051] 1. No silicone oil emulsifier is used, which is more environmentally friendly;

[0052] 2. By adding colloidal sulfur during the cooling stage, the effect of adding colloidal sulfur in the early stage on the stability of the emulsification system is overcome;

[0053] 3. During the experiment, it was found that if colloidal sulfur is used and the system is stable, the use of film-forming agent can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 The stability test photos of Example 1 in the cycle, heat resistance and cold resistance tests;

[0055] Figure 2 The stability test photos of Example 2 in the cycle, heat resistance and cold resistance tests;

[0056] Figure 3 The stability test photos of Example 3 in the cycle, heat resistance and cold resistance tests;

[0057] Figure 4 The stability test photos of Comparative Example 1 in the cycle, heat resistance and cold resistance tests;

[0058] Figure 5 The stability test photos of Comparative Example 2 in the cycle, heat resistance and cold resistance tests;

[0059] Figure 6 The stability test photos of Comparative Example 3 in the cycle, heat resistance and cold resistance tests;

[0060] Figure 7 The stability test photos of Comparative Example 4 in the cycle, heat resistance and cold resistance tests;

[0061] Figure 8 These are photos of the stability test of Comparative Example 5 in the cycle, heat resistance and cold resistance tests. DETAILED DESCRIPTION

[0062] In the description of the present invention, it should be noted that if specific conditions are not specified in the examples, the experiments were carried out according to conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used, if the manufacturer is not specified, are all conventional products that can be purchased commercially.

[0063] The preparation method of liquid foundation comprises the following steps:

[0064] The pot must be cleaned, disinfected and dried before production before use.

[0065] 1. Add the materials of phase A into the emulsifying pot in sequence, heat to 65-75℃, and stir to dissolve and disperse evenly.

[0066] 2.Place the Phase B material in a suitable container, stir and dissolve it evenly, then put it into the emulsifier and stir and disperse it evenly, maintaining the temperature at 65-75℃.

[0067] 3. Disperse and grind the Phase C material, then add it into the emulsifier and stir evenly, maintaining the temperature at 65-75℃.

[0068] 4. Add the materials of phase D into the water pot in sequence, heat it to 65-75℃, and stir to disperse and dissolve evenly.

[0069] 5. Start pumping (emulsification). Stir and homogenize the emulsifier at a low speed, and slowly pump the material in the water phase pot into the emulsifier. This takes about 10-15 minutes. Continuously vacuum during this period.

[0070] 6. After emulsification is completed, stir and homogenize at high speed for about 8-12 minutes. The color can be adjusted during this period.

[0071] 7. After the color is qualified, take a small amount of material and test the viscosity. After the viscosity is qualified, cool it to 40-50℃ and add phase E into the emulsifier in sequence, stirring and dispersing until uniform.

[0072] 8. After the temperature drops to 25-40℃, the material can be dumped and unloaded.

[0073] 9. Semi-finished products will be filled and packaged after passing the inspection, and finished products will be put into storage after passing the inspection.

[0074] The formulations of Phases A to E described above can be found in Table 1 below;

[0075] Table 1 Recipe

[0076]

[0077]

[0078]

[0079] Comparative Example 1

[0080] The formula is the same as that of Example 1, except for the preparation method. The preparation method of Comparative Example 1 is:

[0081] 1. Add the materials of phase A into the emulsifying pot in sequence, heat to 65-75℃, and stir to dissolve and disperse evenly.

[0082] 2.Place the Phase B material in a suitable container, stir and dissolve it evenly, then put it into the emulsifier and stir and disperse it evenly, maintaining the temperature at 65-75℃.

[0083] 3. Disperse and grind the Phase C material, then add it into the emulsifier and stir evenly, maintaining the temperature at 65-75℃.

[0084] 4. Add phase D and phase E materials into the water pot in sequence, heat to 65-75℃, and stir to disperse and dissolve evenly.

[0085] 5. Start pumping (emulsification). Stir and homogenize the emulsifier at a low speed, and slowly pump the material in the water phase pot into the emulsifier. This takes about 10-15 minutes. Continuously vacuum during this period.

[0086] 6. After emulsification is completed, stir and homogenize at high speed for about 8-12 minutes. The color can be adjusted during this period.

[0087] 7. After the color is adjusted to meet the requirements, take a small amount of material and test the viscosity. After the viscosity is qualified, cool it down to 25-40℃ and then dump it.

[0088] 8. Semi-finished products will be filled and packaged after passing the inspection, and finished products will be put into storage after passing the inspection.

[0089] The formulations of Comparative Examples 2 to 4 can be referred to Table 2, and the preparation method is the same as that of Example 1;

[0090]

[0091]

[0092] At the same time, the sources of some of the products in the above table are further explained:

[0093] Polyglyceryl-3 polyricinoleate, polyglyceryl-3 oleate: The supplier is Yilun, the brand is OLIFEEL E-NAT.

[0094] Glyceryl behenate, polyglyceryl-6 octastearate: supplier is Gaowei, brand name is Taiset 50.

[0095] Caprylic / capric triglyceride: supplier is Haishi, brand is GTCC.

[0096] Isododecane, disteardimethylammonium hectorite, propylene carbonate: supplier is Hemmings, brand is BENTONE ISD V.

[0097] Dimethicone, Dimethicone / Vinyl Dimethicone Crosspolymer: Supplier is Shin-Etsu, brand name KSG-19.

[0098] CI 77891, isopropyl titanium triisostearate, polydimethylsiloxane, alumina: supplier is United Micropowder, brand name is TI-02ITD.

[0099] CI 77492, isopropyl titanium triisostearate, polydimethylsiloxane: supplier is United Micropowder, brand name is YP-75ITD.

[0100] CI 77491, isopropyl titanium triisostearate, polydimethylsiloxane: supplier is United Micropowder, brand name is RP-29ITD.

[0101] CI 77499, isopropyl titanium triisostearate, polydimethylsiloxane: supplier is United Micropowder, brand name is BP-50ITD.

[0102] 1,3-Propanediol, 1,2-hexanediol, caprylhydroxamic acid, glyceryl caprylate: supplier is Chengzhi, brand is Spectrastat PHL.

[0103] The water and colloidal sulfur in phase E refer to a colloidal sulfur aqueous solution with a colloidal sulfur content of 60 wt%.

[0104] Performance test 1 Emulsion stability test

[0105] Carry out according to the provisions of the cited national standard / industry standard / enterprise standard (such as GB / T 29665 (W / O))

[0106] Cyclic test: maintain at 45℃ for 24 hours, return to room temperature, and then maintain at -15℃ for 24 hours. This is one cycle. After three cycles, return to room temperature and compare the properties with those before the test.

[0107] Heat resistance: Keep at 45±1℃ for 2 months, and compare the properties after returning to room temperature with those before the test;

[0108] Cold resistance: Keep at -15±1℃ for 2 months, and compare the properties after returning to room temperature with those before the test.

[0109] The results of the emulsion stability test are shown in Table 3;

[0110] Table 3 Emulsion stability test results

[0111]

[0112]

[0113] Note: Stratification: Due to the density difference between the emulsion droplets and the dispersion medium, lighter droplets migrate upward and heavier droplets migrate downward, resulting in stratification of the emulsion. At this point, the emulsion structure is not completely destroyed; only the spatial distribution of the droplets has changed. Stratification manifests as the release of oil or water.

[0114] refer to Figures 1 to 8 ;

[0115] Figure 1 The stability test photos of Example 1 in the cycle, heat resistance and cold resistance tests;

[0116] Figure 2 The stability test photos of Example 2 in the cycle, heat resistance and cold resistance tests;

[0117] Figure 3 The stability test photos of Example 3 in the cycle, heat resistance and cold resistance tests;

[0118] Figure 4 The stability test photos of Comparative Example 1 in the cycle, heat resistance and cold resistance tests;

[0119] Figure 5 The stability test photos of Comparative Example 2 in the cycle, heat resistance and cold resistance tests;

[0120] Figure 6 The stability test photos of Comparative Example 3 in the cycle, heat resistance and cold resistance tests;

[0121] Figure 7 The stability test photos of Comparative Example 4 in the cycle, heat resistance and cold resistance tests;

[0122] Figure 8 The stability test photos of Comparative Example 5 in the cycle, heat resistance and cold resistance tests;

[0123] The above tests demonstrate that the selection of emulsifiers and the timing of colloidal sulfur addition are key factors in maintaining emulsion stability. Polyglyceryl-3 polyricinoleate, polyglyceryl-3 oleate, glyceryl behenate, and polyglyceryl-6 octastearate are essential emulsifiers, and their dosage also affects emulsion stability. This suggests that in the presence of colloidal sulfur in water-in-oil foundations, stricter production controls are required to achieve a stable emulsion.

[0124] Performance Test 2: Makeup Durability Test

[0125] 1. Volunteer selection: Volunteers with healthy skin and oily skin were selected and divided into 8 groups, with 5 people in each group;

[0126] 2. Testing: Before the test, volunteers cleansed their faces and then applied the liquid foundation of each of the above-described embodiments and comparative examples according to their daily application amount. It was recommended that volunteers first pour the liquid foundation from the bottle onto the back of their hands, controlling the amount to about the size of a dime; then apply it evenly to the face. The volunteers continued their daily lives and work as normal. Statistics were taken at the 4th, 6th, 8th, 10th, and 12th hours to record whether any makeup came off or the skin tone darkened. If so, the makeup lasted for a certain period of time.

[0127] The statistical results refer to Table 4;

[0128] Table 4 Makeup lasting time

[0129] Time Example 1 9.6 Example 2 9.2 Example 3 9.6 Comparative Example 1 / Comparative Example 2 7.6 Comparative Example 3 / Comparative Example 4 7.2 Comparative Example 5 6.8

[0130] Result analysis: It can be seen from Examples 1 to 3 that the lasting time of the liquid foundation of the present invention exceeds 8 hours; it can be seen from the comparative examples that comparative examples 1 and 3 cannot form stable emulsions, and comparative examples 2 and 4 cannot maintain a long-lasting lasting time, indicating that the choice of emulsifier has a significant impact on the lasting ability; comparative example 5 cannot maintain a long-lasting lasting ability, indicating that less film-forming agent is not conducive to the stability of the foundation during oil secretion, and melting is prone to occur.

[0131] This research demonstrates that the type and amount of the emulsifier and the colloidal sulfur used in this invention are crucial for formula stability and long-lasting makeup. However, this doesn't deny that the other components of this invention have no impact on the aforementioned properties. It's just that when these other components are replaced with conventional components, their impact on these two properties isn't as significant as the three aforementioned components.

[0132] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A method for preparing a liquid foundation containing colloidal sulfur, characterized in that: The steps include: Step 1: emulsifying a raw material mixture containing an emulsifier, an emollient, a film former, a filler, a thickener, a colorant, and a humectant to prepare a water-in-oil emulsion; the emulsification temperature is 65-75° C.; Step 2: Cooling the water-in-oil emulsion of step 1 to below 50° C., adding colloidal sulfur and mixing; Step 3: Continue cooling the product obtained in step 2 to room temperature; The emulsifier does not contain silicone oil emulsifier; The emulsifier includes a first emulsifier; The first emulsifier is polyglyceryl-3 polyricinoleate, polyglyceryl-3 oleate, glyceryl behenate, and polyglyceryl-6 octastearate; wherein the amount of polyglyceryl-3 polyricinoleate and polyglyceryl-3 oleate is equivalent to 2.5-3wt% of the total weight of the liquid foundation; the amount of glyceryl behenate and polyglyceryl-6 octastearate is equivalent to 0.1-0.5wt% of the total weight of the liquid foundation.

2. The preparation method according to claim 1, characterized in that The emulsifier further comprises a second emulsifier, wherein the second emulsifier is sorbitan sesquioleate, and the second emulsifier is equivalent to 0.5-1.5 wt % of the total weight of the liquid foundation.

3. The preparation method according to claim 1, characterized in that The amount of the emulsifier used is equivalent to 3.5-4.5 wt % of the total weight of the liquid foundation.

4. The preparation method according to claim 1, characterized in that The emollient is one or more combinations of squalane, neopentyl glycol diheptanoate, C10-18 fatty acid triglycerides, isononyl isononanoate, caprylic / capric triglyceride, and C15-19 alkanes; the emollient is equivalent to 25-35wt% of the total weight of the liquid foundation.

5. The preparation method according to claim 1, characterized in that The filler is one or more combinations of polydimethylsiloxane, polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer, and silica; the filler is equivalent to 3-4wt% of the total weight of the liquid foundation; the film-forming agent is trimethylsiloxysilicate; the film-forming agent is equivalent to 3-4wt% of the total weight of the liquid foundation; the colorant is one or more combinations of CI 77891, CI 77492, CI 77491, and CI 77499; the colorant is equivalent to 12-15wt% of the total weight of the liquid foundation; the thickener is one or more combinations of isododecane, disteardimonium hectorite, and propylene carbonate; the thickener is equivalent to 3-5wt% of the total weight of the liquid foundation.

6. The preparation method according to claim 1, characterized in that The moisturizing agent is one or more combinations of dipropylene glycol, glycerin, caprylyl glycol, ethylhexylglycerin, 1,3-propylene glycol, 1,2-hexanediol, caprylhydroxamic acid, and glyceryl caprylate; the moisturizing agent is equivalent to 8-10wt% of the total weight of the liquid foundation; and the moisturizing agent further comprises a stabilizer and / or fragrance, the stabilizer is one or more combinations of magnesium sulfate and sodium chloride; the stabilizer is equivalent to 0.1-0.5wt% of the total weight of the liquid foundation.

7. The preparation method according to claim 1, characterized in that The colloidal sulfur is equivalent to 2 to 4 wt% of the total weight of the liquid foundation; The water content in the liquid foundation is 25-40 wt %.

8. The preparation method according to claim 1, characterized in that The method is specifically as follows: Step 1: Add the first emulsifier, at least part of the emollient, and the filler into a reaction vessel and disperse them evenly at 65-75° C.; Step 2: Add the film-forming agent to the system of step 1; Step 3: Grind the second emulsifier and colorant and add them to the system of step 2; Step 4: Pre-disperse water and moisturizer and add them into the system of step 3 for emulsification; Step 5: Homogenize the mixture from step 4; Step 6: Cool down to 40-50°C, add colloidal sulfur, and stir to mix; The first emulsifier is polyglyceryl-3 polyricinoleate, polyglyceryl-3 oleate, glyceryl behenate, and polyglyceryl-6 octastearate; Wherein, the amount of polyglyceryl-3 polyricinoleate and polyglyceryl-3 oleate is equivalent to 2.5-3wt% of the total weight of the liquid foundation; The amount of glyceryl behenate and polyglyceryl-6 octastearate is equivalent to 0.1 to 0.5 wt% of the total weight of the liquid foundation; The second emulsifier is sorbitan sesquioleate, and the second emulsifier is equivalent to 0.5-1.5 wt % of the total weight of the liquid foundation.

9. The preparation method according to claim 8, characterized in that The homogenization speed in step 5 is 5000-6000 rpm, and the homogenization time is 8-12 min.

10. A liquid foundation containing colloidal sulfur, characterized in that: The method is prepared by any one of claims 1 to 9.

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