Selenium disulfide shampoo with good suspension effect and preparation method thereof

Abstract

The invention discloses selenium disulfide shampoo with a good suspension effect and a preparation method of the selenium disulfide shampoo. The selenium disulfide shampoo comprises the following raw materials in percentage by weight: 0.05-1% of selenium disulfide particles; 0.2-6% of a high-molecular polymer capable of suspending selenium disulfide particles; 0.5 to 5% of a polyol; and 0.05%-0.1% of a chelating agent. The selenium disulfide shampoo has the advantage of being good in suspension effect, and the problems that in the using process of existing selenium disulfide shampoo, due to the fact that the dispersion uniformity and suspension stability of selenium disulfide in the shampoo are poor, the selenium disulfide is likely to be precipitated in a shampoo container, the concentration of the selenium disulfide before and after use is different, and the selenium disulfide cannot be precipitated in the shampoo container are solved. The treatment effect of the selenium disulfide shampoo on a patient is influenced.

Description

Technical Field

[0001] The invention relates to the technical field of shampoo liquid, in particular to a selenium disulfide shampoo with good suspension effect and a preparation method thereof. Background Art

[0002] Dandruff is a phenomenon of excessive flaking caused by excessive proliferation of keratinocytes on the scalp, which affects the lives of many people. Dandruff is a mild form of seborrheic dermatitis that occurs on the scalp, manifested by the shedding of clumps of dead skin cells from the scalp. The mechanism of seborrheic dermatitis is the uninhibited proliferation of Malassezia yeasts. The treatment is mainly symptomatic treatment such as degreasing, anti-inflammatory, bactericidal, and antipruritic. Commonly used topical treatment drugs include bifonazole, selenium disulfide, and zinc pyrithione.

[0003] With the accelerated pace of life and the increase in work pressure, more and more people are beginning to worry about scalp care problems. Common scalp problems include dandruff and scalp itching. People will consider using selenium disulfide shampoo. Since selenium disulfide itself is insoluble in the lotion matrix, the dispersion uniformity and suspension stability of selenium disulfide in the lotion affect the product quality of selenium disulfide lotion. How selenium disulfide is suspended in the shampoo formula is crucial, so a selenium disulfide shampoo with good suspension effect is needed. Selenium disulfide shampoo requires a good suspension effect, mainly because selenium disulfide itself is a water-insoluble substance. This means that if it is added directly to water, it will settle to the bottom instead of being evenly distributed in the shampoo. Summary of the invention

[0004] The purpose of the present invention is to provide a selenium disulfide shampoo with good suspension effect and a preparation method thereof. The selenium disulfide shampoo has the advantage of good suspension effect and solves the problem that the existing selenium disulfide shampoo has poor dispersion uniformity and suspension stability in the lotion during use, which may cause selenium disulfide to precipitate in the shampoo container, resulting in different selenium disulfide concentrations before and after use, thereby affecting the therapeutic effect of the selenium disulfide shampoo on patients.

[0005] To achieve the above object, the present invention provides the following technical solution: a selenium disulfide shampoo with good suspension effect, comprising the following raw materials in percentage by weight:

[0006] 0.05-1% selenium disulfide particles;

[0007] 0.2-6% of a high molecular weight polymer capable of suspending selenium disulfide particles;

[0008] 0.5-5% polyol;

[0009] 0.05-0.1% chelating agent;

[0010] 0.02-0.2% zinc salt;

[0011] 0.1-1.5% sunscreen;

[0012] 0.3-0.8% preservatives;

[0013] 0.1-1% surfactant;

[0014] 84.4-98.91% water.

[0015] As a preferred selenium disulfide shampoo with good suspension effect of the present invention, the high molecular polymer is one or more of the following substances, acrylic acid (ester) copolymer, acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer, carbomer and trihydroxystearin. The high molecular polymer utilizes the steric hindrance characteristics to inhibit the re-agglomeration of selenium disulfide particles, and utilizes its suspension effect to make the selenium disulfide shampoo suspended and stable.

[0016] As a preferred selenium disulfide shampoo with good suspension effect of the present invention, the particle size of the selenium disulfide particles is 1-5 μm.

[0017] As a preferred selenium disulfide shampoo with good suspension effect of the present invention, the sunscreen improves the light stability of the selenium disulfide shampoo, and the sunscreen is one or more of the following substances: titanium dioxide, ethylene glycol distearate, mica and synthetic fluorphlogopite.

[0018] As a preferred selenium disulfide shampoo with good suspension effect of the present invention, the surfactant is an anionic surfactant, the anionic surfactant is used for decontamination and foaming, and the anionic surfactant is one or more of the following substances, sodium lauryl polyether sulfate, ammonium lauryl polyether sulfate, sodium lauryl sulfate and ammonium lauryl sulfate.

[0019] As a preferred selenium disulfide shampoo with good suspension effect of the present invention, the surfactant can also be one or more of an amphoteric surfactant and a nonionic surfactant. The amphoteric surfactant is used for thickening and reducing irritation, and the nonionic surfactant is used for thickening and stabilizing foam.

[0020] As a preferred selenium disulfide shampoo with good suspension effect of the present invention, the amphoteric surfactant is one or more of the following substances, cocamidopropyl betaine, sodium lauroamphoacetate, sodium cocoamphoacetate, disodium cocoamphodiacetate, lauryl betaine, coco betaine, lauryl hydroxysulfonyl betaine, cocamidopropyl hydroxysulfonyl betaine;

[0021] The nonionic surfactant is one or more of the following substances: cocamide DEA, cocamide MEA, cocamide methyl MEA, cocamide MIPA, cocamide AMP, lauryl glucoside, octyl / decyl glucoside, decyl glucoside, lauryl / myristic glucoside, octyl / myristic glucoside, lauramine oxide and coconut glucoside.

[0022] A preparation method of selenium disulfide shampoo with good suspension effect comprises the following steps:

[0023] S1. The high molecular polymer is trihydroxystearin, the proportion of trihydroxystearin is 0.20%, the chelating agent is disodium EDTA, the nonionic surfactant is cocamide MEA, the polyol is cetearyl alcohol, and the sunscreen is ethylene glycol distearate. Then, trihydroxystearin, disodium EDTA, cocamide MEA, cetearyl alcohol and ethylene glycol distearate are put into a heating reactor;

[0024] S2. Soak Ultrez21 in 20% deionized water for 3 hours in advance. Ultrez21 is an acrylate / C10-30 alkyl ester cross-linked polymer and is an easily dispersed self-wetting rheology modifier.

[0025] S3, adding guar gum hydroxypropyltrimethylammonium chloride, water and soaked Ultrez21 into the reactor, the proportion of Ultrez21 is 0.2%;

[0026] S4, cocamidopropyl betaine is selected as the amphoteric surfactant, phenoxyethanol is selected as the preservative, and cocamidopropyl betaine and phenoxyethanol are added into the reactor;

[0027] S5. Select sodium laureth sulfate as the anionic surfactant and put the sodium laureth sulfate into the reaction kettle.

[0028] As a preferred method for preparing a selenium disulfide shampoo with good suspension effect of the present invention, in the process of mixing the raw materials in the reactor, Ultrez21, guar hydroxypropyltrimethylammonium chloride and water are first stirred and dispersed uniformly, and then sodium laureth sulfate is added until it is completely dissolved. After dissolution, the temperature is raised to 85°C, trihydroxystearin, disodium EDTA, cocamide MEA, cetearyl alcohol and ethylene glycol distearate are added respectively and then stirred for 30 minutes. After the stirring is completed, the temperature is lowered to 45°C, cocamidopropyl betaine, phenoxyethanol, AquaSF-1, selenium disulfide particles and zinc salt are added, and the mixture is fully stirred and mixed to obtain selenium disulfide shampoo.

[0029] As a preferred method for preparing a selenium disulfide shampoo with good suspension effect of the present invention, the pH of the selenium disulfide shampoo is controlled to be 5.5-6.5, and the viscosity is 8000-10000 mPa.s.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The present invention uses high molecular polymers. These polymers can effectively inhibit the re-agglomeration of selenium disulfide particles by utilizing the steric hindrance effect, thereby ensuring that selenium disulfide is evenly dispersed in the shampoo and remains in a suspended state. Selenium disulfide is an effective antifungal agent that can help treat dandruff and other scalp problems caused by fungi. By controlling the particle size and concentration of selenium disulfide particles, it can be ensured that they fully cover the scalp during the shampooing process and exert the best therapeutic effect.

[0032] 2. The present invention can improve the light stability of shampoo by adding sunscreens, prevent active ingredients such as selenium disulfide from being degraded due to light, and extend the shelf life of the product. Anionic surfactants provide good detergency and foaming properties, amphoteric surfactants help thicken and reduce irritation, making the product milder, and nonionic surfactants further enhance the foam stability and thickening effect of the product, while also helping to reduce skin irritation.

[0033] 3. The polyol added in the present invention has good moisturizing properties, which can help maintain moisture in the scalp and hair and prevent dryness. The high molecular polymer not only provides a suspension effect, but also may provide a certain conditioning effect for the hair, making it softer and smoother. The preservative ensures that the product will not be contaminated by microorganisms during use, thereby extending the shelf life. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the preparation method of the present invention;

[0035] Figure 2 High and low temperature cycle test of the present invention Figure 1 ;

[0036] Figure 3 It is the dosage diagram of the present invention;

[0037] Figure 4 High and low temperature cycle test of the present invention Figure 2 . DETAILED DESCRIPTION

[0038] Example 1

[0039] A selenium disulfide shampoo with good suspension effect, comprising the following raw materials in percentage by weight:

[0040] 0.05-1% selenium disulfide particles;

[0041] 0.2-6% of a high molecular weight polymer capable of suspending selenium disulfide particles;

[0042] 0.5-5% polyol;

[0043] 0.05-0.1% chelating agent;

[0044] 0.02-0.2% zinc salt;

[0045] 0.1-1.5% sunscreen;

[0046] 0.3-0.8% preservatives;

[0047] 0.1-1% surfactant;

[0048] 84.4-98.91% water.

[0049] Furthermore, the high molecular polymer is one or more of the following substances: acrylic acid (ester) copolymers, acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymers, carbomer and trihydroxystearin. The high molecular polymer utilizes steric hindrance characteristics to inhibit the re-agglomeration of selenium disulfide particles, and utilizes its suspending effect to stabilize the suspension of selenium disulfide shampoo.

[0050] Furthermore, the particle size of the selenium disulfide particles is 1-5 μm.

[0051] Furthermore, the sunscreen improves the light stability of the selenium disulfide shampoo, and the sunscreen is one or more of the following substances: titanium dioxide, ethylene glycol distearate, mica and synthetic fluorphlogopite.

[0052] Furthermore, the surfactant is an anionic surfactant, which is used for cleaning and foaming. The anionic surfactant is one or more of the following substances: sodium laureth sulfate, ammonium laureth sulfate, sodium lauryl sulfate and ammonium lauryl sulfate.

[0053] Furthermore, the surfactant may be one or more of an amphoteric surfactant and a nonionic surfactant. The amphoteric surfactant is used for thickening and reducing irritation, and the nonionic surfactant is used for thickening and stabilizing foam.

[0054] Further, the amphoteric surfactant is one or more of the following substances: cocamidopropyl betaine, sodium lauroamphoacetate, sodium cocoamphoacetate, disodium cocoamphodiacetate, lauryl betaine, coco betaine, lauryl hydroxysulfonate, cocamidopropyl hydroxysulfonate;

[0055] Furthermore, the nonionic surfactant is one or more of the following substances: cocamide DEA, cocamide MEA, cocamide methyl MEA, cocamide MIPA, cocamide AMP, lauryl glucoside, octyl / decyl glucoside, decyl glucoside, lauryl / myristic glucoside, octyl / myristic glucoside, lauramine oxide and coconut glucoside.

[0056] By using high molecular polymers, these polymers can effectively inhibit the re-agglomeration of selenium disulfide particles by utilizing the steric hindrance effect, thereby ensuring that selenium disulfide is evenly dispersed in the shampoo and remains suspended. Selenium disulfide is an effective antifungal agent that can help treat dandruff and other scalp problems caused by fungi. By controlling the particle size and concentration of selenium disulfide particles, it can be ensured that they fully cover the scalp during the shampooing process and exert the best therapeutic effect.

[0057] By adding sunscreens, the photostability of shampoo can be improved, active ingredients such as selenium disulfide can be prevented from being degraded by light, and the shelf life of the product can be extended. Anionic surfactants provide good detergency and foaming properties, amphoteric surfactants help thicken and reduce irritation, making the product milder, and nonionic surfactants further enhance the product's foam stability and thickening effects, while also helping to reduce skin irritation.

[0058] The added polyols have good moisturizing properties and can help retain moisture in the scalp and hair to prevent dryness. The high molecular polymer not only provides a suspension effect, but may also provide a certain conditioning effect for the hair, making it softer and smoother. The preservatives ensure that the product will not be contaminated by microorganisms during use, extending the shelf life.

[0059] Through the synergistic effect of the above-mentioned ingredients, this shampoo can not only effectively solve the dandruff problem, but also provide good cleansing, moisturizing, conditioning and protection effects, meeting users' multi-faceted needs for shampoo.

[0060] Example 2

[0061] See also Figure 1 A method for preparing selenium disulfide shampoo with good suspension effect comprises the following steps:

[0062] S1. The high molecular polymer is trihydroxystearin, the proportion of trihydroxystearin is 0.20%, the chelating agent is disodium EDTA, the nonionic surfactant is cocamide MEA, the polyol is cetearyl alcohol, and the sunscreen is ethylene glycol distearate. Then, trihydroxystearin, disodium EDTA, cocamide MEA, cetearyl alcohol and ethylene glycol distearate are put into a heating reactor;

[0063] S2. Soak Ultrez21 in 20% deionized water for 3 hours in advance. Ultrez21 is an acrylate / C10-30 alkyl ester cross-linked polymer and is an easily dispersed self-wetting rheology modifier.

[0064] S3, adding guar gum hydroxypropyltrimethylammonium chloride, water and soaked Ultrez21 into the reactor, the proportion of Ultrez21 is 0.2%;

[0065] S4, cocamidopropyl betaine is selected as the amphoteric surfactant, phenoxyethanol is selected as the preservative, and cocamidopropyl betaine and phenoxyethanol are added into the reactor;

[0066] S5. Select sodium laureth sulfate as the anionic surfactant and put the sodium laureth sulfate into the reaction kettle.

[0067] Furthermore, in the process of mixing these raw materials in the reactor, Ultrez21, guar hydroxypropyltrimethylammonium chloride and water are first stirred and dispersed evenly, and then sodium laureth sulfate is added until it is completely dissolved. After dissolution, the temperature is raised to 85°C, and trihydroxystearin, disodium EDTA, cocamide MEA, cetearyl alcohol and ethylene glycol distearate are added respectively and then stirred for 30 minutes. After stirring, the temperature is lowered to 45°C, and cocamidopropyl betaine, phenoxyethanol, AquaSF-1, selenium disulfide particles and zinc salt are added. After fully stirring and mixing, selenium disulfide shampoo is obtained.

[0068] Furthermore, the pH of the selenium disulfide shampoo is controlled to be 5.5-6.5, and the viscosity is 8000-10000 mPa.s.

[0069] Trihydroxystearin was selected as the high molecular weight polymer, which can use the steric hindrance effect to inhibit the re-agglomeration of selenium disulfide particles and maintain their uniform dispersion in the shampoo. Ultrez 21 (acrylate / C10-30 alkyl ester crosslinked polymer) was used, which is a self-wetting rheology modifier that helps to improve the viscosity and suspension stability of the system. By soaking Ultrez 21 in deionized water first and then adding it to the reactor to mix with other ingredients, it can be ensured that it is fully dispersed to avoid the formation of lumps.

[0070] Adding trihydroxystearin, disodium EDTA, cocamide MEA, cetearyl alcohol and ethylene glycol distearate with stirring at high temperature (85°C) helps to completely dissolve and evenly distribute these ingredients. Sodium laureth sulfate, as an anionic surfactant, provides good detergency and foaming properties. Cocamidopropyl betaine, as an amphoteric surfactant, not only helps to thicken and reduce irritation, but also enhances the stability of the foam. Cocamide MEA, as a nonionic surfactant, further enhances the product's foam stability and thickening effect, while also helping to reduce skin irritation.

[0071] Cetearyl alcohol, as a polyol, has good moisturizing properties and can help retain moisture in the scalp and hair to prevent dryness. Guar hydroxypropyltrimonium chloride and AquaSF-1 (a water-soluble silicone polymer) provide additional conditioning effects, making hair softer and smoother. Phenoxyethanol acts as a preservative to ensure that the product will not be contaminated by microorganisms during use and extend the shelf life. Disodium EDTA acts as a chelating agent, which can chelate metal ions to prevent them from adversely affecting other ingredients in the formula, thereby improving the stability of the product.

[0072] As a sunscreen, ethylene glycol distearate can improve the photostability of shampoo and prevent active ingredients such as selenium disulfide from being degraded by light. By controlling the pH value of the final product to 5.5-6.5, it ensures that the shampoo is suitable for the scalp environment of most people, neither too acidic nor too alkaline. The viscosity is controlled at 8000-10000mPa·s, ensuring the good fluidity and feel of the shampoo.

[0073] Comparative Example 1

[0074] Four suspending agents, including acrylic acid (ester) copolymers, acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymers, carbomer, and trihydroxystearin, were selected for testing. After the test, it was found that acrylic acid (ester) copolymers have strong foam stabilizing ability, but the foam generated by shearing and stirring during production is difficult to eliminate, resulting in a long defoaming time and high energy consumption. Caromer940 and U21 are easy to absorb moisture and agglomerate, and need to be soaked in advance before use, which is time-consuming and inconvenient to use. Trihydroxystearin is formed by hydrogenation and oxidation of castor oil. In daily chemical products, trihydroxystearin can effectively provide thixotropy and prevent sedimentation and sagging. Shampoo containing silicone oil, selenium disulfide, pearlescent agent and other ingredients was taken as the research object, and the suspension effects of trihydroxystearin, Caromer940, Ultrez21, and AquaSF-1 were compared, and the effects of various suspending agents on various indicators of shampoo were analyzed.

[0075] The effects of suspending agents on shampoo stability are as follows:

[0076] Different shampoos were made according to the above formula, and the solid content of the suspending agent was controlled at 0.5%, 0.4%, 0.3%, 0.2%, and 0.1%. The samples were tested for stability, and the results were divided into normal and abnormal.

[0077] 1. Hot and cold cycle stability test, after 3 months at -18-40℃ and returning to normal temperature, the shampoo does not separate;

[0078] 2. High temperature stability: 45℃ for 3 months, shampoo does not separate;

[0079] 3. Low temperature stability - 18℃ for 3 months, return to normal temperature, the shampoo does not separate, the results are as follows Figure 2 as shown.

[0080] When the content of the suspending agent is 0.2%, trihydroxystearin has the best suspending ability among the four suspending agents, and can suspend silicone oil, pearlescent flakes, selenium disulfide and other ingredients in shampoo, and the system is stable and not stratified. The principle of action is that trihydroxystearin, as a high-molecular castor oil derivative, stretches and expands its molecules under high-temperature shear, and its swelling volume is larger than that of other suspending agents. At the same time, trihydroxystearin has the lowest cost among the four suspending agents, and can be directly added at high temperature, and the application process is simple.

[0081] refer to Figure 3 and Figure 4 The effects of suspending agents on shampoo foaming power are as follows:

[0082] From the results of the effect of suspending agents on shampoo foam, from the foaming performance point of view, the shampoo with trihydroxystearin added has a slightly lower foam of 2mm than the blank sample, and its foam height after 5min and 10min is slightly greater than the foam height of the blank sample. It can be concluded that trihydroxystearin helps to stabilize the foam and improve the durability of the foam. Ultrez21 and AquaSF-1 have better foaming ability than trihydroxystearin, so the formula is further optimized and compounded.

[0083] Single factor condition optimization

[0084] (1) Selection of Caromer 940 dosage

[0085] The amount of trihydroxystearin was controlled at 0.2%, and the effects of different amounts of Caromer940 (0.05, 0.10, 0.15, 0.20) on the suspension properties of shampoo were investigated in turn.

[0086] (2) Ultrez 21 dosage selection

[0087] The amount of trihydroxystearin was controlled at 0.2%, and the effects of different amounts of Ultrez 21 (0.05, 0.10, 0.15, 0.20) on the suspension performance of shampoo were investigated in turn.

[0088] (3) Selection of AquaSF-1 dosage

[0089] The amount of trihydroxystearin was controlled at 0.2%, and the effects of different amounts of AquaSF-1 (0.05, 0.10, 0.15, 0.20) on the suspension properties of shampoo were investigated in turn.

[0090] The effects of suspending agents on shampoo stability are as follows:

[0091] When 0.2% trihydroxystearin is added to shampoo, the compound Caromer940, Ultrez21 and SF-1 have good stability. In order to further determine a better combination, the effect of suspending agent on the safety of shampoo is tested.

[0092] In the experiment, 0.2% trihydroxystearin was compounded with 0.05, 0.10, 0.15, and 0.20 Caromer940, Ultrez 21, and AquaSF-1 respectively according to the stable dosage of the formula. Samples were prepared according to the above basic shampoo formula for testing. The sensory evaluation and stability of 0.20% trihydroxystearin compounded with Ultrez 210.2% were the best, so this suspending agent combination was selected as the suspending agent combination.

[0093] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A selenium disulfide shampoo with good suspension effect, characterized in that: The following raw materials are included in weight percentage: 0.05-1% selenium disulfide particles; 0.2-6% of a high molecular weight polymer capable of suspending selenium disulfide particles; 0.5-5% polyol; 0.05-0.1% chelating agent; 0.02-0.2% zinc salt; 0.1-1.5% sunscreen; 0.3-0.8% preservatives; 0.1-1% surfactant; 84.4-98.91% water.

2. A selenium disulfide shampoo with good suspension effect according to claim 1, characterized in that: The high molecular polymer is one or more of the following substances: acrylic acid (ester) copolymer, acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer, carbomer and trihydroxystearin. The high molecular polymer utilizes the steric hindrance characteristics to inhibit the re-agglomeration of selenium disulfide particles, and utilizes its suspending effect to make the selenium disulfide shampoo suspended and stable.

3. A selenium disulfide shampoo with good suspension effect according to claim 2, characterized in that: The particle size of the selenium disulfide particles is 1-5 μm.

4. A selenium disulfide shampoo with good suspension effect according to claim 3, characterized in that: The sunscreen improves the light stability of selenium disulfide shampoo, and the sunscreen is one or more of the following substances: titanium dioxide, ethylene glycol distearate, mica and synthetic fluorphlogopite.

5. A selenium disulfide shampoo with good suspension effect according to claim 4, characterized in that: The surfactant is an anionic surfactant, which is used for decontamination and foaming. The anionic surfactant is one or more of the following substances: sodium laureth sulfate, ammonium laureth sulfate, sodium lauryl sulfate and ammonium lauryl sulfate.

6. The selenium disulfide shampoo with good suspension effect according to claim 5, characterized in that: The surfactant may also be one or more of an amphoteric surfactant and a nonionic surfactant. The amphoteric surfactant is used for thickening and reducing irritation, and the nonionic surfactant is used for thickening and stabilizing foam.

7. A selenium disulfide shampoo with good suspension effect according to claim 6, characterized in that: The amphoteric surfactant is one or more of the following substances: cocamidopropyl betaine, sodium lauroamphoacetate, sodium cocoamphoacetate, disodium cocoamphodiacetate, lauryl betaine, coco betaine, lauryl hydroxysulfonate, cocamidopropyl hydroxysulfonate; The nonionic surfactant is one or more of the following substances: cocamide DEA, cocamide MEA, cocamide methyl MEA, cocamide MIPA, cocamide AMP, lauryl glucoside, octyl / decyl glucoside, decyl glucoside, lauryl / myristic glucoside, octyl / myristic glucoside, lauramine oxide and coconut glucoside.

8. A method for preparing a selenium disulfide shampoo with good suspension effect, applicable to the selenium disulfide shampoo with good suspension effect as claimed in claim 7, characterized in that: The following steps are involved: S1. The high molecular polymer is trihydroxystearin, the proportion of trihydroxystearin is 0.20%, the chelating agent is disodium EDTA, the nonionic surfactant is cocamide MEA, the polyol is cetearyl alcohol, and the sunscreen is ethylene glycol distearate. Then, trihydroxystearin, disodium EDTA, cocamide MEA, cetearyl alcohol and ethylene glycol distearate are put into a heating reactor; S2. Soak Ultrez21 in 20% deionized water for 3 hours in advance. Ultrez21 is an acrylate / C10-30 alkyl ester cross-linked polymer and is an easily dispersed self-wetting rheology modifier. S3, adding guar gum hydroxypropyltrimethylammonium chloride, water and soaked Ultrez21 into the reactor, the proportion of Ultrez21 is 0.2%; S4, cocamidopropyl betaine is selected as the amphoteric surfactant, phenoxyethanol is selected as the preservative, and cocamidopropyl betaine and phenoxyethanol are added into the reactor; S5. Select sodium laureth sulfate as the anionic surfactant and put the sodium laureth sulfate into the reaction kettle.

9. The method for preparing a selenium disulfide shampoo with good suspension effect according to claim 8, characterized in that: In the process of mixing the raw materials, the reactor is firstly stirred and dispersed evenly with Ultrez21, guar hydroxypropyltrimethylammonium chloride and water, and then sodium laureth sulfate is added until it is completely dissolved. After dissolution, the temperature is raised to 85°C, trihydroxystearin, disodium EDTA, cocamide MEA, cetearyl alcohol and ethylene glycol distearate are added respectively and then stirred for 30 minutes. After the stirring is completed, the temperature is lowered to 45°C, cocamidopropyl betaine, phenoxyethanol, AquaSF-1, selenium disulfide particles and zinc salt are added, and the mixture is fully stirred and mixed to obtain selenium disulfide shampoo.

10. The method for preparing a selenium disulfide shampoo with good suspension effect according to claim 9, characterized in that: The pH value of the selenium disulfide shampoo is controlled to be 5.5-6.5, and the viscosity is 8000-10000 mPa.s.

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