Selenium disulfide stable emulsification system, application and shampoo

Abstract

The invention belongs to the field of daily chemicals, and particularly relates to a selenium disulfide stable emulsification system.The preparation method of pre-dispersed selenium disulfide comprises the steps that selenium disulfide, glycerin and polysaccharide are mixed and homogenized, then zwitterionic surfactant is added, and the pre-dispersed selenium disulfide is prepared; the polysaccharide has a thickening function in water. According to the emulsifying system, glycerol and xanthan gum are adopted for pre-dispersing and wrapping selenium disulfide, so that selenium disulfide can be suspended by sorbitan triisostearate with three hydrophobic groups, after the formula is used, the selectivity of an emulsifying agent in the emulsion is wider, and meanwhile, the emulsifying effect is better. In a formula development process, sorbitan triisostearate is found to have very good moistening and moisturizing effects on scalp, and the problems of dandruff increase and head itching caused by using selenium disulfide shampoo by a dry scalp user can be solved by using sorbitan triisostearate. Meanwhile, the invention further provides application of the emulsification system and shampoo.

Description

Technical Field

[0001] The invention belongs to the field of daily chemicals, and particularly relates to a selenium disulfide stable emulsification system, application and shampoo. Background Art

[0002] The scalp is the soil of hair, and only a healthy scalp can grow healthy hair. Scalp problems such as oily scalp, dandruff, itchy scalp, and hair loss have always troubled everyone. Therefore, the market share of shampoos for anti-dandruff and anti-itching products has remained high.

[0003] At present, the anti-dandruff agents in anti-dandruff shampoos on the market are mainly pyrithione zinc (ZPT), piroctone ethanolamine salt (OCT), and climbazole (CLM). In addition, there are new anti-dandruff agents such as dipotassium glycyrrhizinate, potassium hexamididine di(hydroxyethylsulfonate), and plant anti-dandruff factors. In recent years, more and more shampoo products have developed new products using selenium disulfide as an anti-dandruff ingredient. Solving the stability problem of selenium disulfide in products is an important issue that needs to be considered in the formulation. Selenium disulfide can play a significant role in antibacterial and oil control, and its application in the formulation has problems such as discoloration, taste change, and precipitation. On the other hand, the generation of dandruff is not only caused by excessive reproduction of oily hair and Malassezia furfur. For dry scalp, excessive drying of the scalp after using selenium disulfide shampoo can also cause dandruff and itchy scalp. Therefore, solving the problem of excessive drying of the scalp after using selenium disulfide is also a technical point that needs to be solved.

[0004] Regarding the stability problem of selenium disulfide, those skilled in the art have already discovered it. For example, CN118436555A discloses a method for encapsulating selenium disulfide with chitosan quaternary ammonium salt and its application in shampoo. It records that selenium disulfide is cheap, but it is difficult to dissolve in water or disperse in the system, and it is difficult to be compatible with shampoo and is not widely used in shampoo products. The method uses chitosan quaternary ammonium salt to encapsulate selenium disulfide, which can reduce the amount of selenium disulfide used and reduce irritation to the scalp, and can also use quaternary ammonium salt chitosan to adsorb to hair, thereby enhancing the deposition of selenium disulfide on the hair or scalp, thereby enhancing the anti-dandruff effect of selenium disulfide. CN117883322A A selenium disulfide shampoo and its preparation method use a suspension stabilizing protective agent to help suspend and stabilize selenium disulfide, solving the problem that the selenium disulfide shampoo foam is not durable, and the shampoo is easy to stratify, discolor, and precipitate; the suspension stabilizing protective agent is a combination of three or more of colloidal sulfur, hydrogenated castor oil, disodium lauryl sulfosuccinate, zinc pyrrolidone carboxylate (PCA zinc), coconut oil methyl monoethanolamide (cocoamide methyl MEA), and starch hydroxypropyl trimethyl ammonium chloride. CN115887294A A selenium disulfide shampoo and its preparation method use acrylic acid (ester) copolymers and other high molecular polymers to suspend selenium disulfide. CN116251026A A dandruff shampoo and its preparation method use sodium lignin sulfonate, sodium lauryl sulfate, coconut oil, and propylene glycol to suspend selenium disulfide. CN114788788A discloses a selenium disulfide encapsulation technology and a selenium disulfide shampoo, which uses salicylic acid, a silane coupling agent and silicone oil to suspend selenium disulfide.

[0005] Among the products on the market, most mature products use high molecular polymers to suspend selenium disulfide, such as carbomer. Carbomer-type suspension stabilizers used in the formula will increase the astringency of flushing water.

[0006] Using surfactants to suspend selenium disulfide is an effective method that can suspend selenium disulfide without increasing the astringency of flushing water. However, the problem with using surfactants for suspension is that the selectivity of surfactants is very limited. For example, CN117883322A can only select three or more combinations of colloidal sulfur, hydrogenated castor oil, disodium lauryl sulfosuccinate, zinc pyrrolidone carboxylate (zinc PCA), cocoyl methyl monoethanolamide (cocoyl amide methyl MEA), and starch hydroxypropyl trimethyl ammonium chloride; this poses a challenge to the selectivity of formula application.

[0007] In addition, selenium disulfide cannot be well applied to the removal of dry scalp dandruff, which is also a problem that has not been solved in this field.

[0008] The technical problem to be solved in this case is: how to make selenium disulfide suitable for the removal of dry scalp dandruff and how to improve the applicability of the formula of selenium disulfide. Summary of the invention

[0009] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a stable emulsified system of selenium disulfide. The emulsified system uses glycerin and xanthan gum to pre-disperse and encapsulate selenium disulfide so that it can be suspended by sorbitan triisostearate with three hydrophobic groups. After using the formula of the present invention, the emulsifier in the emulsion can be more selective. At the same time, it is found in the process of formula development that sorbitan triisostearate has a very good moisturizing effect on the scalp. By using sorbitan triisostearate, the problem of increased dandruff and itchy scalp caused by users with dry scalp using selenium disulfide shampoo can be solved.

[0010] Meanwhile, the invention also provides application of the emulsification system and shampoo.

[0011] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0012] A selenium disulfide stable emulsification system, comprising an emulsifier, water, pre-dispersed selenium disulfide and an inorganic salt for adjusting the viscosity of the emulsification system;

[0013] The method for preparing the pre-dispersed selenium disulfide is as follows: selenium disulfide is homogenized by mixing glycerol and polysaccharide, and then a zwitterionic surfactant is added to prepare the pre-dispersed selenium disulfide; the polysaccharide is a polysaccharide having a thickening function in water;

[0014] The emulsifier contains sorbitan triisostearate;

[0015] The weight ratio of selenium disulfide, glycerol and polysaccharide is 0.1-1.1:1.5-2.5:0.1-0.5;

[0016] Preferably, the weight ratio of selenium disulfide, glycerol and polysaccharide is 0.8-1.1:1.5-2.5:0.1-0.5.

[0017] In the formula of the present invention, glycerin is used to disperse selenium disulfide, so that the surface of selenium disulfide can be fully combined with glycerin, which is beneficial to the full dispersion of selenium disulfide and the uniform encapsulation of selenium disulfide by polysaccharide. The polyhydroxy structure on the surface of polysaccharide can be fully combined with glycerin on the surface of selenium disulfide, and finally the encapsulation of selenium disulfide is achieved through zwitterionic surfactant. When this encapsulation structure is used in combination with sorbitan triisostearate, sorbitan triisostearate can stably suspend the inclusion body due to its three hydrophobic segments. At the same time, this encapsulation structure can also achieve the sustained release and stability of selenium disulfide, reducing the irritation to the scalp. In addition, the good moisturizing and hydrating effect of sorbitan triisostearate itself further reduces the irritation of selenium disulfide to dry scalp, avoiding the problem of increased dandruff and itchy scalp caused by users with dry scalp using this product.

[0018] In some experiments of the present invention, we found that when other surfactants with suspension function are used to replace sorbitan triisostearate, it will neither show good suspension performance for selenium disulfide nor such excellent low irritation; such as using sodium stearoyl lactylate or C8-C14 alkyl glucoside (described in CN111643433A, an oil-controlling and anti-dandruff shampoo composition), we believe that the fundamental reason is that sorbitan triisostearate has three hydrophobic segments.

[0019] At the same time, by verifying other suspending surfactants with three hydrophobic segments, such as trihydroxystearin, we found that although it can suspend pre-dispersed selenium disulfide well, it is not as suitable as sorbitan triisostearate for people with dry scalp.

[0020] Through the scheme of the present invention, the selection of the emulsifier of the present invention is diversified, and the user group of the shampoo is expanded.

[0021] In the above selenium disulfide stable emulsification system, the weight ratio of sorbitan triisostearate to selenium disulfide is 2.5-3.5:0.1-1.1.

[0022] Preferably, the weight ratio of sorbitan triisostearate to selenium disulfide is 2.5-3.5:0.8-1.1.

[0023] In the above-mentioned selenium disulfide stable emulsification system, the emulsifier further comprises one or more combinations of anionic surfactants and nonionic surfactants.

[0024] In the above-mentioned selenium disulfide stabilized emulsification system, the anionic surfactant is one or more combinations of sodium laureth sulfate (70%), disodium lauryl sulfosuccinate (30wt%), sodium C14-16 olefin sulfonate (35wt%), and ammonium laureth sulfate (70wt%);

[0025] The nonionic surfactant is one or more combinations of cocamide MEA, ethylene glycol distearate, cocamide DEA, and cocamide MIPA;

[0026] The zwitterionic surfactant is one or more combinations of cocamidopropyl hydroxysulfonyl betaine, cocamidopropyl betaine, and lauryl betaine;

[0027] The active content of the anionic surfactant in the formula is 10-15wt%; the dosage of the nonionic surfactant is 0.5-2wt%.

[0028] In the above-mentioned selenium disulfide stable emulsification system, the inorganic salt is sodium chloride.

[0029] In the above selenium disulfide stable emulsification system, the content of selenium disulfide is 0.8-1.1 wt %; and the polysaccharide is xanthan gum or guar gum.

[0030] In the above-mentioned selenium disulfide stable emulsification system, the mass ratio of the zwitterionic surfactant to selenium disulfide is 3-5:0.8-1.1.

[0031] At the same time, the present invention also discloses the use of any of the above-mentioned selenium disulfide stable emulsification systems for preparing shampoo products.

[0032] Finally, the present invention also discloses a shampoo, comprising any of the above-described selenium disulfide stable emulsified systems; the selenium disulfide stable emulsified system is further added with one or more combinations of hair conditioners, silicones, bactericides, moisturizers, preservatives, chelating agents, pH regulators, and sodium chloride.

[0033] In the above-mentioned shampoo, the hair conditioning agent is one or more combinations of guar hydroxypropyltrimethylammonium chloride, polyquaternium-10, polyquaternium-7, and polyquaternium-22; the silicone is one or more combinations of emulsified silicone oil, aminosilicone emulsion, and polyether modified silicone oil; the bactericide and moisturizer is one or more combinations of colloidal sulfur, piroctone olamine salt, and climbazole; the chelating agent is one or more combinations of etidronate, disodium EDTA, and sodium hexametaphosphate; the pH adjuster is one or more combinations of citric acid, sodium hydroxide, and sodium citrate.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The emulsification system of the present invention uses glycerin and xanthan gum to pre-disperse and encapsulate selenium disulfide, so that it can be suspended by sorbitan triisostearate with three hydrophobic groups. After using the formula of the present invention, the emulsifier in the emulsion can be more selective. At the same time, it is found in the process of formula development that sorbitan triisostearate has a very good moisturizing effect on the scalp. By using sorbitan triisostearate, the problems of increased dandruff and itchy scalp caused by users with dry scalp using selenium disulfide shampoo can be solved.

[0036] Through the scheme of the present invention, the selection of the emulsifier of the present invention is diversified, and the user group of the shampoo is expanded. DETAILED DESCRIPTION

[0037] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0038] Source of raw materials:

[0039] Guar Gum Hydroxypropyltrimethylammonium Chloride: Kunshan Jingkun Oilfield Chemical Technology Co., Ltd., raw material model cationic guar gum JK140K;

[0040] Polyquaternium-10: Avi (Zhongshan) Biotechnology Co., Ltd., Filfix 910;

[0041] Etidronic acid: DEQUEST Italmatch Chemicals, raw material model Turpinal SL;

[0042] Sodium laureth sulfate: Guangdong Lichen Aowei Industrial Co., Ltd., raw material model RSAW ESB70 / ZA;

[0043] Cocamidopropyl hydroxysultaine: Guangzhou Huayu Fine Chemical Co., Ltd., raw material model FS CHSB-35;

[0044] Cocamide MEA: Zhongshan Kemei Oil Chemical Co., Ltd., C3-A (cocamide MEA);

[0045] Sorbitan triisostearate: Guangzhou Meiboya Chemical Co., Ltd., MBY-313;

[0046] Colloidal sulfur: Ruimeng (Shanghai) Trading Co., Ltd., Sulfidal TM Colloidal Sulfur CosmeticGrade;

[0047] Selenium sulfide: Salius Pharma Pvt Ltd., Selenium sulfide;

[0048] Glycerin: Wilmar Oil Technology (Dongguan) Co., Ltd., refined glycerin 100%;

[0049] Xanthan gum: BASF (China) Co., Ltd., Verdessence TM Xanthan;

[0050] Ethylene glycol distearate: Foshan Shihuasha New Materials Co., Ltd., COL EGDS T;

[0051] Emulsified silicone oil: Wacker Chemical (China) Co., Ltd. DM 6124E;

[0052] Sodium chloride: Jiangxi Jiuer Salt Industry Co., Ltd., refined salt;

[0053] Citric acid: Weifang Yingxuan Industrial Co., Ltd., raw material model anhydrous citric acid.

[0054] Part I Preparation of Emulsification System

[0055] The preparation method of the emulsified system is as follows:

[0056] Step 1: Add deionized water to the container;

[0057] Step 2: Add surfactant and thickener to step 1, heat to 85-90°C, and stir for 30 minutes until the raw materials are completely dissolved;

[0058] Step 3: Pre-disperse 1g of glycerol and 0.95g of selenium disulfide, then mix 1g of glycerol and 0.3g of xanthan gum, heat and dissolve, cool to below 48°C, mix the two phases, homogenize at 3000r / min for 3min, add 4g of cocamidopropyl hydroxysulfonyl betaine, stir evenly, and set aside;

[0059] Step 4: Cool the solution in step 2 to below 48°C, add the solution in step 3, and stir for 20 minutes until the raw materials are completely dissolved;

[0060] Step 5: Adjust the pH value to 5.0-5.5 with citric acid (10 wt % concentration) and add sodium chloride to adjust the consistency.

[0061] The formulations of the surfactants of Examples 1-4 are shown in Table 1;

[0062] Table 1 Recipe

[0063]

[0064] The water added to 100 in Table 1 means that the total weight of the emulsified system is controlled to be 100 g.

[0065] Examples 5 to 8 refer to the dosage of the surfactant in Example 1, and by changing the formula of the pre-dispersed selenium disulfide in step 3, the effects of the dosage and selection of each substance of the pre-dispersed selenium disulfide on the performance are explored, with reference to Table 2;

[0066] Table 2 Recipe

[0067]

[0068] Comparative Example 5

[0069] The method is substantially the same as Example 1, except that step 3 is different. Specifically, step 3 is as follows: first, 1 g of ethylene glycol and 0.95 g of selenium disulfide are pre-dispersed, and then 1 g of ethylene glycol and 0.3 g of xanthan gum are mixed and heated to dissolve, and then the mixture is cooled to below 48° C., the two phases are mixed, and then homogenized at a speed of 3000 r / min for 3 min, and 4 g of cocamidopropyl hydroxysulfonate is added, and the mixture is stirred evenly for standby use.

[0070] Comparative Example 6

[0071] The method is substantially the same as Example 1, except that step 3 is different. Specifically, step 3 is as follows: first, 1 g of glycerol and 0.95 g of selenium disulfide are pre-dispersed, and then 1 g of glycerol and 0.3 g of carbomer are mixed and heated to dissolve, and then the mixture is cooled to below 48° C., the two phases are mixed, and then homogenized at a speed of 3000 r / min for 3 min, and 4 g of cocamidopropyl hydroxysulfonyl betaine is added, stirred evenly, and set aside.

[0072] Comparative Example 7

[0073] The method is substantially the same as Example 1, except that sodium stearoyl lactylate is used in an equal weight amount to replace sorbitan triisostearate.

[0074] Comparative Example 8

[0075] The method is substantially the same as Example 1, except that an equal amount of C8-C14 alkyl glucoside is used to replace sorbitan triisostearate.

[0076] Comparative Example 9

[0077] The method is substantially the same as Example 1, except that trihydroxystearin is used in an equal weight amount to replace sorbitan triisostearate.

[0078] Performance Testing

[0079] 1. Selenium disulfide dispersion stability test

[0080] The selenium disulfide shampoo prepared in the above embodiments and comparative examples was placed at room temperature, 48°C, -18°C, and 5°C for 3 months, and the properties of the samples under various conditions before and after storage were checked. The test results can be seen in Table 3;

[0081] Table 3 Stability test results

[0082]

[0083]

[0084]

[0085] Result analysis:

[0086] 1. It can be seen from the results of Examples 1 to 9 that by changing the dosage of different types of surfactants, the types of polysaccharides and the selection of zwitterionic surfactants, the stability of the system can be maintained at a better state and the precipitation of selenium disulfide can be effectively inhibited;

[0087] 2. By comparing Examples 1 to 4 and Comparative Examples 1 to 4, it can be seen that when sorbitan triisostearate is missing, no matter under what storage conditions, it cannot show a good anti-precipitation effect, which indicates that sorbitan triisostearate mainly plays the role of a suspended inclusion in the surfactant system;

[0088] It can be seen from Comparative Examples 7 to 9 that the selection of the suspending agent is also relatively important, and it can be concluded that the suspending agent with three hydrophobic segments makes the greatest contribution to the stability of the system.

[0089] 3. It can be seen from Comparative Examples 6 and 7 that the selection of polyols has little effect on the stability of the system, but the selection of thickener types has a more obvious effect. Although acrylic thickeners have more carboxyl groups, compared with the wrapping angle of pre-dispersed selenium disulfide, it is obvious that the use of polysaccharides will have a significantly better effect.

[0090] 2. Suitability test for dry scalp

[0091] 40 subjects with dry dandruff and itchy scalp were selected and divided into 8 groups, i.e. 5 subjects in each group. After preliminary screening of the 8 groups of cases, 40 subjects aged 18-55 were finally counted. Usage: After the hair is wet, take an appropriate amount of shampoo and apply it evenly on the hair and gently rub until rich foam is produced. Massage the hair and clean the hair, then rinse it off. Use the formula sample 3-5 times continuously and evaluate it in the form of scoring. The evaluation index is: 1 point for "strongly disagree", 2 points for "agree", 3 points for "average", 4 points for "agree", and 5 points for "strongly agree".

[0092] The scoring statistical results refer to Table 4;

[0093] Table 4 Applicability test results for dry scalp

[0094]

[0095] Result analysis: Through the above experimental results, we can get clear conclusions:

[0096] 1. Regarding the types of polysaccharides, xanthan gum is better than guar gum in terms of usage experience;

[0097] 2. The decisive factor for the user's experience with dry hair / skin is the selection and use of suspending agents.

[0098] Through the above two testing methods, it can be clearly known that the technical solution of the present invention can improve the stability of the system and prevent precipitation, and at the same time can widely expand the applicable population of selenium disulfide, which has obvious commercial value.

[0099] Part 2 Application Formulation Testing

[0100] The application formula is shampoo, and its specific formula is shown in Table 5. Its preparation method is as follows:

[0101] Step 1: Add deionized water, guar hydroxypropyltrimonium chloride, and polyquaternium-10, stir for 3 minutes, and then add etidronic acid;

[0102] Step 2: Add sodium laureth sulfate, cocamide MEA, sorbitan triisostearate, and ethylene glycol distearate, heat to 85-90°C, and stir for 30 minutes until the raw materials are completely dissolved;

[0103] Step 3: first pre-disperse 1% glycerol and selenium disulfide, then mix 1% glycerol and xanthan gum, heat and dissolve, cool to below 48°C, mix the two phases, homogenize at 3000r / min for 3min, add cocamidopropyl hydroxysulfonyl betaine, and stir evenly;

[0104] Step 4: Cool down to below 48°C, add colloidal sulfur, emulsified silicone oil, preservative and the pretreatment solution of step 3, and stir for 20 minutes until the raw materials are completely dissolved.

[0105] Step 5: Adjust the pH to 5.0-5.5 with citric acid (10% concentration) and add sodium chloride to adjust the consistency.

[0106] Table 5 Recipe

[0107]

[0108]

[0109] Performance Testing

[0110] 1. Stability test (high temperature, low temperature, high and low temperature cycle): The formula samples are placed in 48℃, 5℃, -18℃, -18~48℃ high and low temperature cycle test to test the stability of the product. The inspection period is 3 months, and there is no abnormality in stability.

[0111] 2. Volunteer testing:

[0112] 33 subjects were enrolled and finally counted, aged 18-55 years old. After getting your hair wet, apply an appropriate amount of shampoo evenly on your hair and gently rub until rich foam is produced. Massage your hair and clean your hair, then rinse it off. Use for 4 weeks, twice a week. Refer to Table 6 for test results and Table 7 for volunteer information;

[0113] Table 6 Summary of evaluation results of subjects using the product for 28 consecutive days

[0114]

[0115]

[0116] Table 7 Volunteer information

[0117]

[0118]

[0119] Evaluation index: 1: "Strongly disagree", 2: "Agree", 3: "Neither", 4: "Agree", 5: "Strongly agree"

[0120] After using the test product for 4 weeks, 90.91% of the subjects thought that the shampoo had good foaming properties, 93.94% of the subjects thought that the shampoo had a hair care effect, 96.97% of the subjects thought that the shampoo was easy to rinse, 100% of the subjects thought that the hair felt more fluffy and not sticky after using the shampoo, 96.97% thought that the shampoo had an anti-dandruff effect, 96.97% thought that the shampoo had an anti-itching effect, and 93.94% thought that the scalp was not dry after using the shampoo. The product covers all scalp types.

[0121] The applicant declares that the present invention illustrates the process method of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned process steps, and it does not mean that the present invention must rely on the above-mentioned process steps to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the raw materials selected by the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A selenium disulfide stable emulsification system, characterized in that: It includes emulsifier, water, pre-dispersed selenium disulfide and inorganic salt for adjusting the viscosity of the emulsified system; The method for preparing the pre-dispersed selenium disulfide is as follows: selenium disulfide is homogenized by mixing glycerol and polysaccharide, and then a zwitterionic surfactant is added to prepare the pre-dispersed selenium disulfide; the polysaccharide is a polysaccharide having a thickening function in water; The emulsifier contains sorbitan triisostearate; The weight ratio of selenium disulfide, glycerol and polysaccharide is 0.1-1.1:1.5-2.5:0.1-0.

5.

2. The selenium disulfide stable emulsification system according to claim 1, characterized in that: The weight ratio of sorbitan triisostearate to selenium disulfide is 2.5-3.5:0.1-1.

1.

3. The selenium disulfide stable emulsification system according to claim 1, characterized in that: The emulsifier also includes one or more combinations of anionic surfactants and nonionic surfactants.

4. The selenium disulfide stable emulsification system according to claim 2, characterized in that: The anionic surfactant is one or more combinations of sodium laureth sulfate, disodium lauryl sulfosuccinate, sodium C14-16 olefin sulfonate, and ammonium laureth sulfate; The nonionic surfactant is one or more combinations of cocamide MEA, ethylene glycol distearate, cocamide DEA, and cocamide MIPA; The zwitterionic surfactant is one or more combinations of cocamidopropyl hydroxysulfonyl betaine, cocamidopropyl betaine, and lauryl betaine; The active content of the anionic surfactant in the formula is 10-15wt%; the dosage of the nonionic surfactant is 0.5-2wt%.

5. The selenium disulfide stable emulsification system according to claim 2, characterized in that: The inorganic salt is sodium chloride.

6. The selenium disulfide stable emulsification system according to any one of claims 1 to 5, characterized in that: The content of selenium disulfide is 0.8-1.1wt%; The polysaccharide is xanthan gum or guar gum.

7. The selenium disulfide stable emulsification system according to claim 6, characterized in that: The mass ratio of the zwitterionic surfactant to selenium disulfide is 3-5:0.8-1.

1.

8. Use of the selenium disulfide stable emulsification system according to any one of claims 1 to 7 in preparing shampoo products.

9. A shampoo, characterized in that: The selenium disulfide stable emulsified system comprises the selenium disulfide stable emulsified system as claimed in any one of claims 1 to 7; the selenium disulfide stable emulsified system further comprises one or more combinations of hair conditioners, silicones, fungicides, moisturizers, preservatives, chelating agents and pH regulators.

10. The shampoo according to claim 9, characterized in that The hair conditioning agent is one or more combinations of guar hydroxypropyltrimethylammonium chloride, polyquaternium-10, polyquaternium-7, and polyquaternium-22; the silicone is one or more combinations of emulsified silicone oil, aminosilicone emulsion, and polyether modified silicone oil; the bactericide and moisturizer is one or more combinations of colloidal sulfur, piroctone olamine salt, and climbazole; the chelating agent is one or more combinations of etidronate, disodium EDTA, and sodium hexametaphosphate; and the pH regulator is one or more combinations of citric acid, sodium hydroxide, and sodium citrate.

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