Silicone oil-free cation-free conditioner shampoo and preparation method thereof

Abstract

The invention discloses silicone oil-free cation-free conditioner shampoo and a preparation method thereof, and particularly belongs to the field of daily care products. The shampoo is prepared from the following components: a plant extract composition, fatty alcohol polyoxyethylene ether sodium sulfate, fatty alcohol ether phosphate, cocamidomethyl MEA, polyethylene glycol laurate and lauramide propyl betaine, the silicone-oil-free and cationic-conditioner-free shampoo has the effects of promoting scalp blood circulation, inhibiting growth of scalp harmful bacteria, inhibiting inflammatory response, inhibiting scalp grease secretion and maintaining scalp health, and aims at reducing or avoiding use of silicone oil and cationic surface active agents, so that potential hazards to scalp and hair are reduced.

Description

Technical Field

[0001] The invention belongs to the field of daily cleaning products, and particularly relates to a silicone oil-free and cationic conditioning agent-free shampoo and a preparation method thereof. Background Art

[0002] As people's demand for personal care products continues to increase, especially in the shampoo market, consumers are paying more and more attention to the safety and environmental friendliness of product ingredients and their care effects on the scalp and hair. In traditional shampoo formulas, silicone oil and cationic surfactants are widely used due to their unique properties, such as making hair smooth and increasing gloss. However, these ingredients also bring some problems.

[0003] Silicone oil, as a hair conditioner, can form a protective film on the hair, but long-term use or excessive use may cause the hair to become greasy and flat, and it is difficult to wash off, which has adverse effects on the scalp. In addition, silicone oil has poor biodegradability in the environment, which does not conform to the current environmental protection concept.

[0004] Cationic conditioning agents, such as quaternary ammonium compounds, are often used to increase the foaming and cleaning power of shampoo and help deposit silicone oil on the hair. However, due to their own cationic properties, cationic conditioning agents are not easy to completely rinse off and will remain on the hair and scalp. Every time you use shampoo, there will be a certain amount of residue. Over time, the hair follicles are blocked, causing the scalp to be unable to breathe normally, affecting the health of the hair. In addition, cationic conditioning agents are also accumulative and easily absorb dust particles, stimulating the scalp to secrete more oil, mixing with dust to form oily dirt, aggravating the greasiness of the hair, forming a vicious cycle, and leading to problems such as itchy scalp and increased dandruff.

[0005] To solve these problems, more and more silicone-free and cationic conditioning agent-free shampoos are appearing on the market. These shampoos are designed to reduce or avoid the use of silicone oil and cationic surfactants, thereby reducing potential harm to the scalp and hair. However, the development of silicone-free and cationic conditioning agent-free shampoos also faces some challenges, such as how to maintain the smoothness and glossiness of hair, and how to enhance the cleaning power and hair care effects of shampoos.

[0006] Plant extracts are increasingly used in shampoo formulations because of their natural, mild and environmentally friendly characteristics. Many plant extracts have the effects of cleaning, moisturizing, hair care, anti-dandruff, and oil control, and can be used as a substitute or supplement for traditional chemical ingredients to improve the comprehensive performance of shampoo. Summary of the invention

[0007] The purpose of the present invention is to provide a silicone-free and cationic conditioning agent-free shampoo, which can achieve unexpected dandruff-removing, itching-relieving, oil-controlling and other effects by adding a plant extract composition into the shampoo, thereby developing a shampoo that has both cleaning and hair care effects and is safe and environmentally friendly. In addition, since the use of silicone oil and cationic surfactants is reduced, the potential harm to the scalp and hair is also reduced.

[0008] To achieve the above object, the present invention discloses the following technical solutions:

[0009] In a first aspect, the present invention provides a silicone-free and cationic conditioning agent-free shampoo, comprising the following components by mass percentage:

[0010]

[0011] The plant extract composition consists of a Dictamni root bark extract, an aloe extract, a rosemary flower extract and a reed root extract.

[0012] Preferably, the plant extract composition consists of the following components in parts by weight:

[0013]

[0014] Further preferably, the plant extract composition consists of the following components in parts by weight:

[0015]

[0016] More preferably, the plant extract composition consists of the following components in parts by weight:

[0017]

[0018]

[0019] Preferably, the shampoo further comprises a pH regulator, a preservative, a flavor, a pigment, a viscosity regulator, and a solvent.

[0020] Further preferably, the essence is jasmine essence;

[0021] The preservative is p-hydroxyacetophenone;

[0022] The pigment is a brilliant blue pigment;

[0023] The pH regulator is at least one of potassium hydroxide and citric acid;

[0024] The viscosity modifier is sodium chloride;

[0025] The solvent is deionized water.

[0026] In a second aspect, the present invention provides a method for preparing the above-mentioned silicone oil-free and cationic conditioning agent-free shampoo, comprising the following steps:

[0027] S1. First, stir and mix the fatty alcohol ether phosphate and 1 / 3 of deionized water, and then adjust the pH value to 6-7 with potassium hydroxide;

[0028] S2. The sodium polyoxyethylene fatty alcohol ether sulfate, cocamide methyl MEA and polyethylene glycol laurate are added to the solution of step S1 and stirred to obtain a mixture A;

[0029] S3. Adding lauroyl amide propyl betaine to mixture A and stirring to obtain mixture B;

[0030] S4. The plant extract composition, flavor, pigment, preservative and the remaining deionized water are premixed and then added to the mixture B and stirred to obtain a mixture C;

[0031] S5. Add sodium chloride to the mixture C to adjust the viscosity, and adjust the pH value to 5.5-7.5 with citric acid to obtain the silicone-free and cationic conditioning agent-free shampoo.

[0032] Furthermore, in step S1, the rotation speed of the stirring and mixing is 500 r / min and the mixing temperature is 85-90°C.

[0033] Furthermore, in step S2, the stirring speed is 800 r / min and the temperature is 70-80°C.

[0034] Furthermore, in step S3, the stirring speed is 110-200 r / min and the temperature is 45-50° C.;

[0035] The stirring speed in step S4 is 110-200 r / min and the temperature is 40-45°C.

[0036] In the present invention:

[0037] The effects of Dictamni root bark extract on the scalp include anti-inflammatory, antibacterial, oil control and protection of the scalp barrier, which help reduce scalp inflammation, fungal infections, excessive oil and dandruff. At the same time, it can also help maintain the balance of scalp microecology, relieve discomfort such as scalp itching, and thus promote overall scalp health.

[0038] Aloe vera extract is anti-inflammatory and antibacterial, helping to reduce scalp inflammation and inhibit bacterial growth, promoting scalp health, and it can also moisturize and lock in moisture, providing the scalp with sufficient moisture and improving dryness. In addition, aloe vera extract can promote the healing of small wounds on the scalp, reduce hair loss, and prevent scalp infections such as dandruff and eczema. It can also nourish hair follicles, support the growth of new hair, and soothe the scalp and reduce itching.

[0039] Rosemary flower extract has in vitro antibacterial activity and can inhibit the growth of bacteria on the scalp, including Staphylococcus aureus, helping to reduce scalp infection and inflammation. It can reduce scalp inflammation and improve scalp discomfort caused by inflammation, such as itching and redness. At the same time, rosemary extract contains highly effective antioxidant ingredients, such as rosmarinic acid, which can capture peroxyl free radicals, inhibit peroxidation chain reactions, reduce biomembrane lipid peroxidation caused by free radicals, and protect scalp cells. It can also improve blood flow to the scalp, allowing nutrients to reach the hair roots more easily, thereby supporting hair growth.

[0040] Reed root extract has an inhibitory effect on a variety of bacteria, which makes it effective in fighting bacteria on the scalp and reducing the risk of infection and inflammation. At the same time, reed root extract has a significant antioxidant effect, which can neutralize free radicals and protect scalp cells from damage by oxidative stress, thereby helping to maintain scalp health.

[0041] The present invention has found that the above extracts all have certain antibacterial activity. When used in combination, they can have a more extensive inhibitory effect on bacteria and fungi on the scalp, thereby more effectively controlling scalp infection and inflammation. At the same time, when used in combination, they can effectively inhibit the oil secretion of scalp cells and reduce the accumulation of scalp oil, thereby reducing the greasy feeling and dandruff caused by excessive oil.

[0042] Beneficial effects of the present invention:

[0043] 1. The plant extract composition provided by the present invention has excellent oil control and antibacterial effects, especially has a good inhibitory effect on Malassezia furfur;

[0044] 2. The silicone-free and cationic conditioning agent-free shampoo provided by the present invention has excellent oil control and dandruff removal effects;

[0045] 3. The present invention develops a silicone-free and cationic conditioning agent-free shampoo that has both cleaning and hair care effects and is safe and environmentally friendly by adding a plant extract composition into the shampoo. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. However, the following embodiments are only preferred embodiments of the present invention, not all. For the sake of clarity, all features of the actual embodiments are not described.

[0047] Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without making any creative work shall all fall within the protection scope of the present invention.

[0048] In the present invention:

[0049] Dictamni root bark extract is Dictamni (DICTAMNUSDASYCARPUS) root bark extract, INCI name is DICTAMNUSDASYCARPUS ROOT BARK EXTRACT, purchased from Fufeng Snotech Biotechnology Co., Ltd.;

[0050] Aloe vera extract is Aloe vera (ALOE VERA) extract, INCI name is ALOE VERA EXTRACT, purchased from Weiao Biotechnology Co., Ltd.;

[0051] Rosemary flower extract is rosemary (ROSMARINUS OFFICINALIS) flower extract, INCI name is ROSMARINUS OFFICINALIS (ROSEMARY) FLOWER EXTRACT, purchased from Leshengyuan Biotechnology Co., Ltd.;

[0052] The reed root extract is a reed (PHRAGMITES COMMUNIS) root extract, with the INCI name of PHRAGMITESCOMMUNIS ROOT EXTRACT, purchased from Lanzhou Waters Biotechnology Co., Ltd.

[0053] Preparation of plant extract composition:

[0054] Weigh the corresponding raw materials according to the mass fractions in Table 1, pour them into a mixing blender in sequence, and mix them evenly to obtain plant extract compositions 1-14.

[0055] Table 1. Raw materials of plant extract composition by weight

[0056] Raw material name\group Composition 1 Composition 2 Composition 3 Composition 4 Composition 5 Composition 6 Composition 7 Composition 8 Dictamni root bark extract 0.5 0.9 1 1.1 1.5 - 1 1 Aloe Vera Extract 1 1.5 1.8 2 3 1.8 - 1.8 Rosemary Flower Extract 10 11 12 12 12 12 12 - Phragmites australis root extract 0.1 0.3 0.4 0.5 0.7 0.4 0.4 0.4 Deionized water - - - - - 1 1.8 12 Raw material name\group Composition 9 Composition 10 Composition 11 Composition 12 Composition 13 Composition 14 / / Dictamni root bark extract 1 1 - - - 3.8 / / Aloe Vera Extract 1.8 - 1.8 - - 3.8 / / Rosemary Flower Extract 12 - - 12 - 3.8 / / Phragmites australis root extract - - - - 0.4 3.8 / / Deionized water 0.4 14.2 13.4 3.2 14.8 -

[0057] Note: “-” in the table means not added.

[0058] Composition performance test

[0059] Oil control efficacy test:

[0060] (1) Preparation of reagents:

[0061] Samples to be tested: The compositions 1-14 prepared above were prepared with distilled water to prepare sample solutions with a concentration of 1 wt %.

[0062] Testosterone (T) solution: Dissolve 36 mg of testosterone in anhydrous ethanol to prepare a testosterone solution with a concentration of 5 mmol / L;

[0063] NADPH (reduced coenzyme II) solution: Dissolve 42.5 mg of NADPH tetrasodium salt in water to prepare a 2 mmol / L NADPH solution;

[0064] Reaction solution: Dissolve DTT (dithiothreitol) and sodium phosphate in water to make the final concentrations of DTT and sodium phosphate 1 mmol / L and 20 mmol / L, respectively, to obtain a reaction solution.

[0065] (2) Determination of 5α-reductase activity:

[0066] The reaction components were mixed in order (reaction solution 155 μL, constant temperature 37°C; testosterone solution 10 μL; NADPH solution 10 μL; 5α-reductase 20 μL), and the absorbance change of the reaction system at 340 nm was continuously monitored within 4 min. The rate of change reflected the activity of 5α-reductase (in a reaction system with a temperature of 37°C, the amount of enzyme that causes the NADPH concentration to decrease by 1 μmol / L per minute is one enzyme activity unit), which was recorded as the initial enzyme activity.

[0067] (3) 5α-reductase inhibition rate determination:

[0068] The reaction components were mixed in order (reaction solution 155 μL, constant temperature 37°C; testosterone solution 10 μL; NADPH solution 10 μL; 15 μL of sample solution of composition 1-14 to be tested respectively; 5α-reductase 20 μL), and the change of the absorbance value of the reaction system at 340 nm was continuously monitored within 4 minutes. The enzyme activity of 5α-reductase inactivation was calculated with reference to the NADPH standard curve, and then the 5α-reductase inhibition rate was calculated according to "5α-reductase inhibition rate = inactivated enzyme activity / initial enzyme activity × 100%". The test results are shown in Table 2.

[0069] Table 25 α-reductase inhibition rate

[0070]

[0071]

[0072] Result analysis:

[0073] 5α-reductase is a membrane protease that depends on reduced coenzyme II (NADPH). It is an important male hormone metabolic enzyme in the skin and can irreversibly convert testosterone into dihydrotestosterone. DHT is the most active male hormone and can induce excessive oil secretion from the sebaceous glands. Reducing the level of DHT by inhibiting the activity of 5α-reductase can effectively alleviate excessive oil secretion from the sebaceous glands.

[0074] According to the experimental results, compositions 1-5 provided by the present invention have excellent oil control effects, and compositions 2 and 4 have more obvious effects than compositions 1 and 5; according to the results of compositions 6-9, when any one of Bacopa monnieri extract, aloe extract, rosemary flower extract and reed root extract is missing, the oil control performance of the overall composition will decrease; according to the results of compositions 10-13, the inhibitory performance of a single component on the activity of 5α-reductase is quite limited, and aloe extract and reed root extract have almost no effect of inhibiting 5α-reductase activity when used alone.

[0075] Antibacterial effect test:

[0076] Samples to be tested: The compositions 1-14 prepared above were prepared with distilled water to prepare sample solutions with a concentration of 1 wt %.

[0077] The bacterial strains and liquids used are: Staphylococcus aureus, Propionibacterium acnes, Malassezia furfur;

[0078] Preparation: Dilute with sterile saline to about 7.0 × 10 4 cfu / ml~7.0×10 5 The prepared bacterial suspension should be used within 2 hours or stored at 4°C for no more than 24 hours.

[0079] Antibacterial effect detection: Take the sample solution to be tested, take a sterile dry filter paper, and add 20μL of the sample solution to be tested to each piece. Test bacteria inoculation: Take 1mL of each test bacteria suspension and spread it evenly on the surface of the nutrient agar medium; paste the antibacterial test sample, and paste a contaminated plate for each test. There are 4 filter paper pieces per dish, 3 test pieces, and 1 control piece as a blank. Use sterile tweezers to take the sample piece and paste it on the surface of the plate, place it in a constant temperature incubator at 36±1℃, observe the results after culturing for 24 hours, and measure the diameter of the antibacterial ring with an electronic vernier caliper. The result is the average of 3 measurement data. The test results are shown in Table 3.

[0080] Table 3 Antibacterial effect

[0081]

[0082]

[0083] Note: “-” in the table means not detected.

[0084] Result analysis:

[0085] According to the experimental results, compositions 2 and 4 have better performance than compositions 1 and 5. Therefore, the mass ratio of Dictamni root bark extract, aloe extract, rosemary flower extract and reed root extract is more preferably in the range of (0.9-1.1):(1.5-2):(11-12):(0.03-0.05), and the mass ratio is optimal at 1:1.8:12:0.04; compared with compositions 6-9, composition 3 shows that when any one component is missing in the composition provided by the present invention, the antibacterial and oil-controlling properties of the overall formula will decrease. Combined with the results of compositions 10-13, it can be seen that the antibacterial effects of Dictamni root bark extract, aloe extract, rosemary flower extract and reed root extract are not ideal when used alone, while the antibacterial effect is significantly enhanced when used in combination, achieving a super-additive effect, and the components have a mutually reinforcing effect.

[0086] Preparation of shampoo without silicone oil and cationic conditioning agent

[0087] Weigh the raw materials according to the mass percentage in Table 4;

[0088] Step S1, firstly, aliphatic alcohol ether phosphate and 1 / 3 of deionized water are stirred and mixed at a speed of 500 r / min and a temperature of 85-90° C., and then the pH value is adjusted to 6-7 with potassium hydroxide;

[0089] Step S2, adding sodium fatty alcohol polyoxyethylene ether sulfate, cocamide methyl MEA and polyethylene glycol laurate to the solution of step S1, and stirring at a speed of 800 r / min and a temperature of 70-80° C. to obtain a mixture A;

[0090] Step S3, adding lauryl amide propyl betaine to mixture A, and stirring at a speed of 110-200 r / min and 45-50° C. to obtain mixture B;

[0091] Step S4, premixing the plant extract composition, flavor, pigment, preservative and the remaining 2 / 3 of deionized water, adding them to the mixture B, and stirring them at a speed of 110-200 r / min and 40-45° C. to obtain a mixture C;

[0092] Step S5, adding sodium chloride to the mixture C to adjust the viscosity, and adjusting the pH value to 5.5-7.5 with citric acid to obtain the silicone-free and cationic conditioning agent-free shampoo.

[0093] Table 4 Mass percentage of each raw material in the embodiment (%)

[0094]

[0095] Note: The plant extract composition in the table is taken from plant extract composition 3 in Table 1.

[0096] Human skin patch test

[0097] The five examples prepared above were subjected to the human skin patch test in reference to the "2015 Cosmetic Safety Technical Specifications".

[0098] The skin reaction was observed according to the standard at 30 minutes (after the indentation disappears), 24 hours and 48 hours, and the observation results were recorded (see Table 5).

[0099] Table 5 Human safety test results

[0100] serial number 30min 24h 48h Example 1 Level 0, 30 players Level 0, 30 players Level 0, 30 players Example 2 Level 0, 30 players Level 0, 30 players Level 0, 30 players Example 3 Level 0, 30 players Level 0, 30 players Level 0, 30 players Example 4 Level 0, 30 players Level 0, 30 players Level 0, 30 players Example 5 Level 0, 30 players Level 0, 30 players Level 0, 30 players

[0101] Scalp oil control efficacy test

[0102] Test samples: Examples 1-5;

[0103] Test instrument: Antsci Skin-SP skin tester (skin oil test probe) is used to detect the oil content of the scalp (the higher the oil value, the more oily the skin is). The probe is pressed and contacted with the scalp to be tested for 30 seconds;

[0104] Test conditions: Subjects with oily scalp were selected, aged between 20 and 45 years old, and they voluntarily participated in the test and signed informed consent. During the test, the subjects were prohibited from using any hair products other than the designated shampoo (Examples 1-5). The test environment temperature was 23-25°C, and the humidity was 40%-60%.

[0105] Test number and parts: A total of 25 people were tested, each group corresponded to 5 people, that is, 5 repetitions, the test parts were the top of the head, the golden point, the back point, and the front top, and the average value was taken, that is, the scalp sebum level;

[0106] Testing period: 4 weeks;

[0107] Test time points: before using the product (day 0), two weeks after using the product (day 14), and four weeks after using the product (day 28);

[0108] Test description: The scalp oil content was tested on the four test sites of each test subject, and the initial values ​​(skin oil content on day 0) were measured respectively. Then each test subject was asked to wash his hair every other day at 8:00 in the morning, using 10g each time, massaging for 5 minutes each time, rinsing 3 times, and drying the hair for 2 hours before the skin oil content test was conducted. The values ​​were recorded after using the product for two weeks; the skin oil content test was conducted after using the product for four weeks and the values ​​were recorded; the average values ​​of each group were taken for analysis and comparison of the data. The results are shown in Table 6 below.

[0109] Table 6 Scalp oil content test results

[0110]

[0111] Note: Change rate = (DT-D0) / D0×100%, where DT is the measured value of D14 or D28.

[0112] Anti-dandruff efficacy test

[0113] Test products: Examples 1-5.

[0114] Testers: 25 volunteers with obvious dandruff were recruited as test subjects. All test subjects had excessive complex dandruff such as flaky white scales on their heads. All shampoo and hair care products with anti-dandruff effects were stopped two weeks before the test. The 25 volunteers were evenly divided into 5 groups, and the shampoos of Examples 1-5 were used accordingly, with 5 people in each group.

[0115] Usage: The relevant technical personnel will provide guidance on product use to the subjects when distributing the product. The subjects should use the product at least 3 times a week for 4 weeks. The hair should not be washed within (48±4) hours before the visit.

[0116] Evaluation method: This test evaluates the anti-dandruff ability of shampoo according to the following standards: no visible dandruff is 0 points; very small scales or small, dry, powdery gray scales are 1 point; a small amount of scales or small pieces of gray scales, a small amount of which adhere to the scalp is 2 points; a small amount of scales or medium-sized gray scales, loosely adhered to the scalp is 3 points; more scales or large and obvious scales, adhered to the scalp is 4 points; very many scales or very large agglomerated yellow scales, tightly adhered to the scalp is 5 points. Select a trained professional technician and have him / her perform the evaluation. Take the average score of all volunteers in the group as the group score. The scoring results are shown in Table 7.

[0117] Table 7 Antidandruff ability evaluation table

[0118]

[0119]

[0120] Results Analysis

[0121] According to the experimental results of oil control and anti-dandruff efficacy, it can be seen that the shampoo provided by the present invention has excellent oil control and anti-dandruff effects, and the oil control and anti-dandruff effects are enhanced as the concentration of the plant extract composition in the shampoo increases, and have a certain concentration dependence, that is, the plant extract composition provided by the present invention plays a key role in shampoo.

[0122] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A silicone-free and cationic conditioning agent-free shampoo, characterized in that: By mass percentage, it includes the following components: The plant extract composition consists of a Dictamni root bark extract, an aloe extract, a rosemary flower extract and a reed root extract.

2. The silicone oil-free and cationic conditioning agent-free shampoo according to claim 1, characterized in that: The plant extract composition is composed of the following components in parts by weight:

3. The silicone oil-free and cationic conditioning agent-free shampoo according to claim 2, characterized in that: The plant extract composition is composed of the following components in parts by weight:

4. The silicone oil-free and cationic conditioning agent-free shampoo according to claim 3, characterized in that: The plant extract composition is composed of the following components by weight: composition:

5. The silicone oil-free and cationic conditioning agent-free shampoo according to claim 1, characterized in that: The shampoo also includes a pH regulator, a preservative, an essence, a pigment, a viscosity regulator, and a solvent.

6. The silicone oil-free and cationic conditioning agent-free shampoo according to claim 5, characterized in that: The essence is jasmine essence; The preservative is p-hydroxyacetophenone; The pigment is a brilliant blue pigment; The pH regulator is at least one of potassium hydroxide and citric acid; The viscosity modifier is sodium chloride; The solvent is deionized water.

7. The method for preparing the silicone oil-free and cationic conditioning agent-free shampoo according to claim 6, characterized in that: The following steps are involved: S1. First, stir and mix the fatty alcohol ether phosphate and 1 / 3 of deionized water, and then adjust the pH value to 6-7 with potassium hydroxide; S2. The sodium polyoxyethylene fatty alcohol ether sulfate, cocamide methyl MEA and polyethylene glycol laurate are added to the solution of step S1 and stirred to obtain a mixture A; S3. Adding lauroyl amide propyl betaine to mixture A and stirring to obtain mixture B; S4. The plant extract composition, flavor, pigment, preservative and the remaining 2 / 3 of deionized water are premixed and then added to the mixture B and stirred to obtain a mixture C; S5. Add sodium chloride to the mixture C to adjust the viscosity, and adjust the pH value to 5.5-7.5 with citric acid to obtain the silicone-free and cationic conditioning agent-free shampoo.

8. The method for preparing a silicone oil-free and cationic conditioning agent-free shampoo according to claim 7, characterized in that: The stirring and mixing in step S1 is performed at a rotation speed of 500 r / min and a mixing temperature of 85-90°C.

9. The method for preparing a silicone oil-free and cationic conditioning agent-free shampoo according to claim 7, characterized in that: In step S2, the stirring speed is 800 r / min and the temperature is 70-80°C.

10. The method for preparing a silicone oil-free and cationic conditioning agent-free shampoo according to claim 7, characterized in that: The stirring speed in step S3 is 110-200 r / min and the temperature is 45-50° C.; The stirring speed in step S4 is 110-200 r / min and the temperature is 40-45°C.

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