No-wash hair care composition and preparation method thereof

Abstract

The invention provides a no-wash hair care composition which comprises the following components in percentage by mass: 1-3% of oilseed rape oil amide propyl dimethylamine, 1-3% of essence and the balance of water. 1-10% of higher fatty alcohol; 1-6% of grease; 1%-10% of a humectant and 0.1%-1.8% of a thickening agent; 0.1-4.5% of a conditioner, a proper amount of organic acid and the balance of water. The washing-free hair care composition can smooth hair scales, has a synergistic effect to form a coating film on the surface of hair so as to resist heat damage caused by hot blowing, hair curlers and other modeling articles and an exposure environment, can effectively cover wounds and cracks of hair and repair damaged hair, is fresh and non-irritant in use, and does not need secondary washing.

Description

Technical Field

[0001] This invention belongs to the field of cosmetic technology, specifically relating to a hair care composition and its preparation method. Background Technology

[0002] With increasing environmental pollution, more frequent extreme temperatures, and stronger ultraviolet radiation, coupled with frequent perming, dyeing, blow-drying, straightening, and sun exposure, the hair cuticles are easily damaged by heat, leading to more and more hair problems: dryness, frizz, split ends, tangles, breakage, and difficulty in combing.

[0003] To smooth hair cuticles, prevent damage from subsequent blow-drying and styling equipment, protect the scalp, repair hair, and reduce heat damage, hair conditioner, hair cream, and hair oil products are recommended. Traditional conditioners use fatty alcohols as a base, leaving hair feeling heavy and sticky. This prevents the conditioner from holding too much oil, resulting in poor penetration and nourishment, and making it difficult to apply. Consequently, hair lacks a light, flowing, and soft feel. Furthermore, the large amount of fatty alcohol and oil residue can leave hair feeling very oily. Therefore, most conditioners are wash-out products, making it difficult for hair to absorb nutrients after washing. Hair oils typically contain a large amount of oil, which can clog hair follicles, preventing proper nutrient absorption and even causing scalp problems. If not rinsed off promptly after application, the oil mixed with dust can easily clog pores. Hair oil itself is quite oily; while moderate use can help moisturize hair, improper use can easily lead to oily hair, attracting bacteria and dust, which is detrimental to hair health. Summary of the Invention

[0004] To address the problems in existing technologies, this invention provides a leave-in hair care composition. This leave-in hair care composition smooths the hair cuticles and works synergistically to form a coating on the hair surface to combat heat damage caused by styling products such as hair dryers and curling irons, as well as sun exposure. It effectively covers wounds and cracks in the hair strands, repairing damaged hair. It is refreshing and non-irritating during use and requires no secondary rinsing.

[0005] To achieve the above objectives, the present invention provides the following technical solutions.

[0006] One aspect of the present invention provides a leave-in hair care composition, characterized in that it comprises, by weight percentage, the following ingredients: Rapeseed oleamide propyl dimethylamine: 1-3%; Higher fatty alcohols: 1~10%; Oils: 1-6%; Moisturizer: 1~10%; Thickener: 0.1~1.8%; Conditioner: 0.1~4.5%; Organic acids: appropriate amount; The remainder is water; wherein the thickener comprises cetyl hydroxyethyl cellulose.

[0007] Furthermore, the content of rapeseed oleamide propyl dimethylamine is 1-2.5%, preferably 1.3-2.2%.

[0008] Furthermore, the content of the higher fatty alcohol is 3.5-6%, preferably 3.5-4.5%, and the higher fatty alcohol is cetearyl alcohol.

[0009] Furthermore, the grease is one or more of silicone oil, synthetic grease, and vegetable oil.

[0010] Furthermore, the silicone oil is a low-viscosity polydimethylsiloxane with a viscosity of 1 to 10 st. Preferably, the viscosity is 5 st.

[0011] Furthermore, the oil is a mixture of polydimethylsiloxane and tea seed oil, wherein the content of polydimethylsiloxane is 2.5-4% and the content of tea seed oil is 0.1-1.0%. Preferably, the content of cyclopentapolydimethylsiloxane is 2.5-3.5% and the content of tea seed oil is 0.35-0.65%.

[0012] Furthermore, the moisturizer is a mixture of glycerin and diglycerin, wherein the content of diglycerin is 0.5-1.5% and the content of glycerin is 3.5-4.5%.

[0013] Furthermore, the thickener is cetyl hydroxyethyl cellulose, and the content of cetyl hydroxyethyl cellulose is 0.5~1.5%, preferably 0.8~1.2%.

[0014] To further improve the feel and smoothness of the hair care composition when applied to the skin, hydroxyethyl cellulose can be added on the basis of using cetyl hydroxyethyl cellulose as a thickener, wherein the content of cetyl hydroxyethyl cellulose is 0.8~1.2% and the content of hydroxyethyl cellulose is 0.05~0.45%.

[0015] Furthermore, the conditioning agent is selected from one or more of maltodextrin / glucoside / aluminum hydrolysate, biosaccharide gum-1, and biosaccharide gum-2.

[0016] Furthermore, the organic acid is selected from one or more of citric acid, glutamic acid, and aspartic acid.

[0017] Furthermore, the viscosity range of the leave-in hair care composition is 10,000 to 18,000 cps, preferably 11,000 to 15,000 cps.

[0018] Furthermore, the leave-in hair care composition does not require the addition of any other emulsifiers.

[0019] The present invention also provides a method for preparing the aforementioned leave-in hair care composition, comprising the following steps: 1: Mix the thickener, water, humectant, and conditioner, heat and stir until homogeneous, then add the organic acid, stir until dissolved, adjust the pH of the mixture to 3.5~5.5, add rapeseed oil amide propyl dimethylamine, and dissolve the mixture until transparent to obtain phase A; 2: Mix higher fatty alcohols and oils to obtain phase B. After phase B is completely dissolved, add it to phase A. 3: The material obtained in step 2 of emulsification is cooled, defoamed, and discharged.

[0020] The present invention also provides a product containing the above-mentioned leave-in hair care composition, wherein a hair conditioner comprising the leave-in hair care composition is provided.

[0021] Beneficial effects: 1. The leave-in hair care composition of the present invention can smooth the hair cuticles and synergistically form a coating on the hair surface to resist heat damage caused by hair dryers, curling irons, and sun exposure. It can effectively cover wounds and cracks in the hair strands and repair damaged hair.

[0022] 2. The leave-in hair care composition of the present invention can reduce the voltage of hair strands caused by friction, thereby effectively inhibiting the occurrence of static electricity and making hair easier to comb and manage.

[0023] 3. The leave-in hair care composition of this invention has a refreshing feel, does not require emulsifying large amounts of oil, and can be quickly replenished with nutrients and moisture lost due to perming, dyeing, blow-drying, styling, and sun exposure after application. It is convenient to use, healthy, environmentally friendly, and in line with the concept of sustainable development. Attached Figure Description

[0024] Figure 1 Comparative photos of the appearance of the hair care compositions prepared in Example 2 (left) and Comparative Example 1 (right) after stability testing. Figure 2 Comparative photos of hair care compositions prepared using Comparative Example 5 (left) and Example 4 (right) applied to hair strands. Figure 3 Comparative photos (500x magnification) of hair care compositions prepared in Example 4 (left) and Comparative Example 5 (right) after high-temperature treatment of hair cuticles. Figure 4 Comparative photos of hair care compositions prepared using Comparative Example 3 (left) and Example 4 (right) applied to hair strands. Detailed Implementation

[0025] To better understand the present invention, it is now further described in conjunction with embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto. Experimental methods in the following embodiments that do not specify specific conditions are conventional methods and conditions well known to those skilled in the art.

[0026] Preparation method of self-produced tea seed oil: After removing impurities from Himalayan green tea seeds, the crushed seeds are compressed at 50°C using a physical pressing method to separate the oil, obtaining crude oil. The crude oil is then filtered using a filter membrane to remove impurities and residues, yielding tea seed oil with an oleic acid content of 60%.

[0027] Example 1: Preparation of the leave-in hair care composition of Example 1 1: Phase A: Mix 1 part cetyl hydroxyethyl cellulose, water, 4 parts glycerol, 1 part diglycerol, and 2 parts maltodextrin / starch hydrolysate, heat and stir until uniform, then add citric acid, stir to dissolve, adjust the pH of the mixture to 4, then add 2 parts rapeseed oil amide propyl dimethylamine, and dissolve the mixture until transparent to obtain Phase A.

[0028] 2: Mix 4 parts of cetearyl alcohol and 3 parts of polydimethylsiloxane with a viscosity of 5 st to obtain phase B. After phase B is completely dissolved, add the prepared phase A. 3: Emulsified material is cooled and defoamed before being discharged.

[0029] The preparation methods of Examples 2-4 are the same as those of Example 1, and the contents and proportions of each component are detailed in Table 1.

[0030] Comparative Example 1 The preparation method is the same as in Example 1, except that the thickener is replaced with 1 part of hydroxyethyl cellulose. The contents and proportions of the other components are detailed in Table 1.

[0031] Comparative Example 2 The preparation method is the same as in Example 1, except that the thickener is 2 parts of cetyl hydroxyethyl cellulose, and the contents and proportions of the other components are detailed in Table 1.

[0032] Comparative Example 3: The preparation method is the same as in Example 1, except that the amount of maltodextrin / starch hydrolysate added is 5 parts, and the contents and ratios of the other components are detailed in Table 1.

[0033] Comparative Example 4 The preparation method is the same as in Example 1, except that the silicone oil is replaced with an equal mass of European hazelnut oil. The contents and proportions of the other components are detailed in Table 1.

[0034] Comparative Example 5 The preparation method is the same as in Example 1. The amount of maltodextrin / starch hydrolysate added is 0.3 parts. The contents and proportions of the other components are detailed in Table 1.

[0035] Comparative Example 6 The preparation method is the same as in Example 1, except that the thickener is replaced with only 1 part of hydroxypropyl methylcellulose. The contents and proportions of the other components are detailed in Table 1.

[0036] Table 1: Formulas of hair care compositions

[0037] The leave-in hair care compositions prepared in each embodiment are all milky white emulsion systems with good fluidity. Using a BROOKFIELD (model DV2T) device with rotor No. 5 and a rotation speed of 12 rpm, the material was placed in a constant temperature chamber at 25°C for 24 hours before being taken out to test the viscosity. The measured viscosity range was between 12000 and 14000 cps.

[0038] II: Examples and Comparative Examples - Physical Properties and Efficacy Tests 1. Stability Test: Samples: Leave-in hair care product compositions prepared in Examples 1-4 and Comparative Examples 1-6 Testing instruments: Temperature chambers operating under thermal cycling conditions at 50℃, 40℃, 25℃, 5℃, and -20℃. Test conditions: 50℃, 40℃, 25℃. 5℃, -20℃, thermal cycling.

[0039] 70 ml of each hair care composition prepared in the examples and comparative examples was placed in a transparent glass bottle. Each bottle was labeled with the test conditions, and the samples were placed in the corresponding constant temperature incubator for testing. After 1 week of testing, the test samples were removed from the incubator and left for 24 hours. The state of the samples was then observed (whether emulsification and stratification occurred). The stability test results are shown in Table 2. "Good" means the composition did not undergo emulsification or stratification after the stability test; "Poor" means the composition stratified after the stability test.

[0040] Table 2 Stability Test Results

[0041] As shown in Table 1, the addition of cetyl cellulose as a thickener to the emulsion system can stabilize the hair care composition system formed by rapeseed oil amide propyl dimethylamine. The resulting hair care composition has moderate viscosity and good stability, making it suitable for preparing hair care products such as hair conditioners.

[0042] The appearance of the hair care composition prepared in Comparative Example 1 after stability testing is shown in Figure 1. Figure 1As can be seen, in Comparative Example 1, which only used the conventional thickener hydroxyethyl cellulose, the material exhibited stratification. This indicates that using only 1 part hydroxyethyl cellulose as a thickener cannot stably produce a no-wash heat-protective emulsion, resulting in a poorly stable emulsion system.

[0043] The hair care composition prepared in Comparative Example 2 used 2 parts of cetyl hydroxyethyl cellulose. The hair care composition with excessive cetyl hydroxyethyl cellulose had poor stability and high viscosity, making it difficult to apply and affecting normal use.

[0044] Comparative Example 6 used only the conventional thickener hydroxypropyl methylcellulose. The resulting composition system was dispersed at high temperature and then cooled to form a gel. Subsequent processing required reheating, which would destroy the thickener's gel system, further preventing the formation of a homogeneous material after homogenization. Furthermore, the resulting composition system had too low a viscosity, making it difficult to spread and failing to meet the development requirements for hair care products.

[0045] 2. Gloss test: Test instrument: Multifunctional analyzer, model Cutometer dual MPA 580.

[0046] Test conditions: After washing and drying the hair strands with shampoo, equilibrate at (23±2)°C and (60±10)% relative humidity for 1 hour. Wash hands thoroughly, take a specific amount of hair cream in the palm, rub evenly, and then apply the hair care composition to the hair with the palm. Apply the hair care compositions of Examples 1-4 and Comparative Examples 3-5 to the hair of the experimental group with the palm, allowing the hair care composition to coat the hair evenly for 1 hour. Then, use a Skin-Glossymeter probe to test the gloss of the hair strands; the higher the test data, the better the gloss. The test results are shown in Table 3.

[0047] 3. Thermal protection test: Further evaluation was conducted on the protective effect of the leave-in hair care compositions prepared in Examples 1-4 and Comparative Examples 3-5 against hair damage at high temperatures.

[0048] Sample preparation: Wash hands thoroughly, take a specific amount of the leave-in hair care composition prepared in Examples 1-4 and Comparative Examples 3-5 into the palm of your hand, rub it evenly, and then use your palm to evenly apply the hair cream to the surface of the hair strands in the laboratory group. The blank group does not need to be applied. After the hair strands have been left to stand for 10 minutes, use a 1000W hair dryer on the highest setting to blow-dry the hair strands for 5 minutes.

[0049] 3.1 Protection against cuticle damage Test sample: Black, untreated flat hair strands (specific length and specific weight) Testing equipment: Microscope Test conditions: Experimental group Sample preparation: Wash hands thoroughly, take a specific amount of hair cream in the palm of your hand, rub it evenly, and then apply the hair cream evenly to the surface of the hair strands in the laboratory group. Let the hair strands sit for 10 minutes before using a hot blow dryer. Use a 1000W hair dryer on the highest setting to blow-dry the hair for 5 minutes.

[0050] The test group determined the degree of damage to the hair cuticles. The lower the degree of cuticle damage, the better the heat protection of the hair cream for the hair.

[0051] Subjective scoring based on the degree of hair cuticle damage; in, 9~10: Most severe damage 7~8: Severe damage; 5-6 points: Damage; 3-4 points: Minor injury; 1-2 points: No damage.

[0052] The test results are shown in Table 3.

[0053] 3.2 Performance Evaluation 3.2.1. Dry combing properties: Testing instrument: Hair smoothness tester, model EMIC DL~500 Test sample: Black, untreated flat hair strands (specific length and specific weight) Testing instrument: Hair combability tester Test conditions: The combability of dry hair strands was tested under the conditions of (23±2)°C and (60±10)% relative humidity.

[0054] Sample preparation: Wash hands thoroughly, take a specific amount of hair cream in the palm of your hand, rub it evenly, and then apply the hair cream evenly to the surface of the hair strands in the laboratory group. Let the hair strands sit for 10 minutes, and then blow-dry them for 5 minutes using a 1000W hair dryer on the highest setting.

[0055] The combability of the experimental groups before and after sample treatment was measured using a hair combability testing instrument. The percentage of combing work per bundle treated in the experimental groups was compared. To reduce measurement errors caused by different hair bundles, the same hair bundle was tested three times and the average value was taken.

[0056] Calculate the percentage reduction in combing effort before and after application (combing effort after blow-drying - combing effort before blow-drying) / combing effort before blow-drying. The higher this value, the better the combing performance, indicating better heat resistance of the hair care composition.

[0057] 3.2.2. Wet combing performance test Testing instrument: Hair smoothness tester, model EMIC DL-500 Test sample: Black, untreated flat hair strands (specific length and specific weight) Testing instrument: Hair combability tester Test conditions: Testing wet hair strands under high humidity conditions. Sample preparation: Wet the hair strands evenly, wash your hands thoroughly, take a specific amount of hair cream in your palm, rub it evenly, and then apply the hair cream evenly to the surface of the hair strands in the laboratory group. The control group does not need to be coated. Let the hair strands sit for 10 minutes, then blow-dry them. Use a 1000W hair dryer on the highest setting to blow-dry the hair strands for 5 minutes.

[0058] Calculate the reduction ratio between the hair strand experimental group and the control group. Calculate (combing effort after blow-drying - combing effort before blow-drying) / combing effort before blow-drying. The larger this value, the better the combing performance, indicating that the hair care composition has better heat resistance.

[0059] The test results for dry carding performance and wet carding performance are shown in Table 3.

[0060] 4. Sensory testing: The user experience of the leave-in hair care compositions of Examples 1-4 and Comparative Examples 3-5 was further evaluated.

[0061] Twenty participants aged 25-35 with long hair were selected. After washing their hair and before blow-drying, approximately 0.3-0.8g of the composition was placed in the palm of their hands, rubbed evenly, and then applied to the hair of the experimental group using their palms. The hair composition was then evenly spread on the hair before blow-drying. This process was repeated 5 times, and user feedback was collected.

[0062] The specific application comfort rating includes: (1) Evaluation of application feel: (1~2 are not easy to apply, 3~4 are easy to apply, 5~6 are easy to apply) (2) Moisturizing effect evaluation: (1~2 is average moisturizing effect, 3~4 is moderate moisturizing effect, 5~6 is excessively moisturizing effect) (3) Hair smoothness: (1~2 is moderately smooth, 3~4 is smooth, 5~6 is noticeably smooth) (4) Hair feels refreshed after application (1~2: none, 3~4: normal, 5~6: refreshing) (5) Hair softness after application (1~2 no improvement, 3~4 average, 5~6 soft).

[0063] The evaluation results were averaged and rounded off. The statistical results are shown in Table 3.

[0064] Table 3 Test results of Examples 1-3 and Comparative Examples 3-5

[0065] After using the leave-in hair care compositions of Examples 1-4, the hair has a high degree of shine, good heat protection performance, and a good user experience, meeting the requirements for product usability and efficacy.

[0066] In the hair care compositions of Examples 2-4, tea seed oil and silicone oil are combined, and the conditioning agent maltodextrin / aluminum hydrolysate in the synergistic system can not only smooth and protect the hair cuticle and reduce cuticle damage, but also improve the combability and repair properties of the product and enhance the shine of the hair. Under the same conditions, the hair care compositions of Examples 2-4 have better heat protection, less cuticle damage, better hair smoothness and stronger shine.

[0067] Meanwhile, in Examples 2-4, the hair care compositions, while using cetyl hydroxyethyl cellulose for thickening, also incorporate a small amount of hydroxyethyl cellulose. This not only retains the emulsifying effect of cetyl hydroxyethyl cellulose on the system but also provides excellent smoothness and application feel.

[0068] Comparative Example 3: The hair care composition contained an excessive amount of the conditioning agent maltodextrin / glycoside / aluminum hydrolysate. After using this hair care composition, the hair had an overly strong film-like feel, the hair strands were prone to tangling, resulting in decreased hair softness and an unattractive appearance. (e.g.) Figure 4 Adding a large amount of certain ingredients can also reduce the cleanliness of the hair after using this hair care composition.

[0069] Comparative Example 4: The use of European hazelnut oil in the hair care composition reduces the spreadability and smoothness of the composition. This does not meet the requirements for leave-in products.

[0070] Comparative Example 5 shows a lower amount of maltodextrin / amylose hydrolysate in the hair care composition, resulting in poor heat protection and failing to meet the requirements for heat-protective hair care products. Observation of the hair cuticle reveals that its heat protection is significantly lower than that of Example 4 (e.g., ...). Figure 3 The improvement in hair combability and smoothness, as well as the effect on reducing static electricity, were far less than in Example 4 (e.g., Figure 2 ).

[0071] The examples described above are merely illustrations of several embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these modifications or substitutions all fall within the scope of protection of the present invention. The appended claims shall prevail.

Claims

1. A no-rinse hair care composition characterized in that: By mass percentage, comprising the following ingredients: Rapeseed amido propyl dimethyl amine: 1~3%; Higher fatty alcohol: 1~10%; Oil: 1~6%; Moisturizer: 1~10%; Thickening agent: 0.1~1.8%; Conditioning agent: 0.1~4.5%; Organic acid: appropriate amount, the balance is water; wherein, the thickening agent comprises cetyl hydroxyethyl cellulose.

2. The no-rinse hair care composition of Claim 1, wherein: The content of the rapeseed amido propyl dimethyl amine is 1~2.5%, preferably 1.3~2.2%.

3. The no-rinse hair care composition of Claim 1, wherein: The content of the higher fatty alcohol is 3.5~6%, preferably 3.5~4.5%; the higher fatty alcohol is cetyl stearyl alcohol.

4. The no-rinse hair care composition of Claim 1, wherein: The oil is one or more of silicone oil, synthetic oil, and vegetable oil, wherein the silicone oil is polydimethylsiloxane with a viscosity of 1~10st, and the viscosity is preferably 5st.

5. The no-rinse hair care composition of Claim 1 wherein: The oil is a mixture of polydimethylsiloxane and tea seed oil, wherein the content of the polydimethylsiloxane is 2.5~4%, and the content of the tea seed oil is 0.15~1.0%; preferably, the content of the polydimethylsiloxane is 2.5~3.5%, and the content of the tea seed oil is 0.35~0.65%.

6. The no-rinse hair care composition of Claim 1 wherein: The thickening agent is cetyl hydroxyethyl cellulose, and the content of the cetyl hydroxyethyl cellulose is 0.5~1.5%, preferably 0.8~1.2%.

7. The no-rinse hair care composition of Claim 1 wherein: The thickening agent is a mixture of cetyl hydroxyethyl cellulose and hydroxyethyl cellulose, wherein the content of the cetyl hydroxyethyl cellulose is 0.8~1.2%, and the content of the hydroxyethyl cellulose is 0.05~0.45%.

8. The no-rinse hair care composition of claim 1, wherein: The moisturizer is a mixture of glycerol and diglycerol, wherein the content of the diglycerol is 0.5~1.5%, and the content of the glycerol is 3.5~4.5%; the conditioning agent is selected from one or more of maltodextrin glucoside / starch hydrolysate, biosaccharide gum-1, and biosaccharide gum-2.

9. A method for preparing the leave-on hair care composition of claims 1-8, comprising the following steps: 1): mix and heat the thickening agent, water, moisturizer, and conditioning agent, stir until uniform, add the organic acid, stir until dissolved, then adjust the pH of the material to 3.5~5.5, add the rapeseed amido propyl dimethyl amine, and stir until the material is dissolved and transparent to obtain phase A; 2): mix the higher fatty alcohol and oil to obtain phase B, and then add phase A after phase B is completely dissolved; 3): emulsify the material obtained in step 2, cool, deaerate, and discharge to obtain the leave-on hair care composition.

10. Use of a leave-on hair care composition according to any one of claims 1 to 8, characterized in that: A hair care cream comprising the leave-on hair care composition.

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