Composition for repairing damaged hair and preparation method thereof

Abstract

The invention discloses a composition for repairing damaged hair and a preparation method thereof, and belongs to the technical field of personal care products. Aiming at the technical bottleneck that the deposition efficiency of a macromolecular repairing component oryzanol on the hair surface is low, a nano-emulsion system is innovatively designed, and a synergistic formula comprising the oryzanol (0.1-10%), cysteine (0.01-10%), a lecithin emulsifier (1-20%), caprylic / capric triglyceride (1-50%) and the balance of water is provided. Wherein cysteine is adsorbed on the surface of hair in a targeted mode, the deposition efficiency of oryzanol is remarkably improved, and cysteine and oryzanol cooperate to repair keratin disulfide bond damage caused by chemical perming and dyeing or ultraviolet rays and restore the mechanical property and combing property of the hair; the composition for repairing damaged hair provided by the invention is in a nano-emulsion form, is high in stability, organically combines water-soluble cysteine with oil-soluble oryzanol, and can be conveniently applied to finished products of personal care products (including medicines or cosmetics).

Description

Technical Field

[0001] The invention belongs to the technical field of personal care products, and particularly relates to a composition for repairing damaged hair and a preparation method thereof. Background Art

[0002] When the human body is exposed to the external environment, ultraviolet rays and air pollutants will affect the quality of hair. In addition, hairdressing, perming, styling and other factors can cause hair to become dry, frizzy, damaged, and prone to breakage and split ends. The main component of human hair fibers is keratin, and the keratin chains are entangled by ionic forces, hydrogen bonds, van der Waals interactions and disulfide bonds. Disulfide bonds originate from sulfur-containing cystine bonds, which form strong cross-links between adjacent chains. These disulfide bonds are essential in giving the hair shaft shape, stability and elasticity. For example, perming involves the breaking and reorganization of disulfide bonds in the hair. The oxidants used in perming and dyeing change the structure of proteins and lipids, affecting the tensile properties, toughness and gloss of the hair, and accelerate the loss of protective lipids in the hair. In addition, ultraviolet radiation can also affect the strength and elasticity of hair, making the hair quality worse. Therefore, hair care products usually use moisturizing, antioxidant, and cationic softening ingredients to make the hair look shiny, smooth, strong and not easy to break, that is, the state of "healthy" hair.

[0003] Oryzanol is a ferulic acid ester compound extracted from rice bran oil. It has antioxidant and sunscreen effects, and can also promote metabolism and new hair growth. [1,2,3] , repair damaged hair [4] However, oryzanol has a large molecular weight, and the amount of deposition during the use of hair care products is small, which cannot achieve the expected hair care effect. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, increase the deposition amount of the repairing ingredient oryzanol in the hair and achieve a better effect, the present invention discloses a composition for repairing damaged hair and a preparation method thereof. The composition is a nanoemulsion containing oryzanol and cysteine. Cysteine ​​can be preferentially adsorbed on the surface of the hair, thereby increasing the deposition amount of oryzanol, achieving a synergistic effect, repairing damaged hair, and making the hair smooth, shiny, strong and not easy to break.

[0005] Technical solution: To achieve the above purpose, the present invention adopts the following technical solution:

[0006] A composition for repairing damaged hair, the composition is composed of 0.1-10% oryzanol, 0.01-10% cysteine, 1-20% lecithin emulsifier, 1-50% caprylic acid triglyceride and the balance water. Oryzanol has the effects of anti-oxidation and repairing damaged hair, and the addition of cysteine ​​can increase the deposition amount of oryzanol on hair. In addition to the two key substances of oryzanol (oil-soluble) and cysteine ​​(water-soluble), in the composition, lecithin is an emulsifier, and GTCC is an oil phase solvent, which ensures the stability of the composition system.

[0007] Preferably, in the above composition, oryzanol 1-10%, cysteine ​​0.1-10%, lecithin emulsifier 5-20%, caprylic and capric triglyceride 5-30%, and the balance is deionized water;

[0008] Further preferably, in the above composition, oryzanol 2-5%, cysteine ​​0.1-1%, lecithin emulsifier 5-10%, caprylic / capric triglyceride 10-30%, and the balance is deionized water;

[0009] Preferably, in the above composition, the lecithin emulsifier is selected from one or more of behenyl alcohol, stearyl alcohol, PEG-20 soybean sterol, cetyl alcohol, phytosterols or glyceryl stearate.

[0010] The present invention also discloses a method for preparing the composition for repairing damaged hair, comprising the following steps:

[0011] S1: dissolving lecithin emulsifier in caprylic / decanoic acid triglyceride, heating to 60-80°C (preferably 70°C), stirring evenly, and adding oryzanol to dissolve completely;

[0012] S2: heating the deionized water to 60-80°C (preferably 70°C) and keeping the temperature;

[0013] S3: mixing the water and oil phases, homogenizing at a speed of 5000-15000 r / min (preferably 10000 r / min) for 1-5 min (preferably 2 min) to obtain a crude emulsion, and then subjecting the crude emulsion to high-pressure homogenization;

[0014] S4: Cool the material to below 40°C, add cysteine ​​and the remaining water, stir evenly, and discharge the material.

[0015] Preferably, in the above step S3, the high-pressure homogenization process conditions are a homogenization pressure of 60-100 MPa (preferably 100 MPa) and a homogenization number of 2-5 times (preferably 5 times).

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides a composition for repairing damaged hair and a preparation method thereof, which has the following significant improvements:

[0018] (1) Oryzanol can promote metabolism and new hair growth, repair damaged hair, and make hair smooth, shiny, strong and not easy to break. However, the molecular weight of oryzanol is relatively large, and the amount of deposition during the use of hair care products is relatively small, which cannot achieve the expected hair care effect. The present invention first discovered that the use of oryzanol in combination with cysteine ​​can increase the amount of deposition on the hair during use, thereby synergistically enhancing the effect to achieve a better effect;

[0019] (2) The composition for repairing damaged hair and the preparation method thereof provided by the present invention have simple operation steps, low energy consumption, and are easy to produce and use;

[0020] (3) The raw materials used in the composition for repairing damaged hair and the preparation method thereof provided by the present invention are non-toxic and harmless, can be used in cosmetics, and will not cause adverse skin reactions.

[0021] (4) The composition for repairing damaged hair provided by the present invention is in the form of a nanoemulsion with high stability. It organically combines water-soluble cysteine ​​with oil-soluble oryzanol and can be conveniently applied to finished products of personal care products (including medicines or cosmetics). BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Effect of each sample on the tensile strength of hair. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The main experimental materials and sources used in the embodiments are shown in Table 1.

[0024] Table 1 Main experimental materials

[0025]

[0026] The main experimental instruments used in the examples are as follows:

[0027] Constant temperature air drying oven, constant temperature water bath, constant temperature incubator, high shear average emulsifier, high pressure homogenizer, mixer, tensile tester, resistance meter, real human hair bundles (damaged hair due to perm and dyeing), etc.

[0028] Examples 1-5, Comparative Examples 1-2 and Blank Examples

[0029] The amounts of the components of the damaged hair repairing compositions of Examples 1-5 are shown in Table 2. The preparation method comprises the following steps:

[0030] S1: Dissolve lecithin emulsifier in caprylic / decanoic acid triglyceride, heat to 70°C, stir evenly, and add oryzanol to dissolve completely;

[0031] S2: heating the deionized water to 70°C and keeping it warm;

[0032] S3: mixing the water and oil phases, homogenizing at a speed of 10000 r / min for 2 min to obtain a crude emulsion, and then subjecting the crude emulsion to high-pressure homogenization;

[0033] S4: Cool the material to below 40°C, add cysteine ​​and the remaining water, stir evenly, and discharge the material.

[0034] In step S3, the high-pressure homogenization process conditions are a homogenization pressure of 100 MPa and a homogenization number of 5 times.

[0035] Comparative Example The preparation method of Comparative Example 1 is substantially the same as that of Examples 1-5, wherein the amount of cysteine ​​added is 0.

[0036] The preparation method of Comparative Example 2 is basically the same as that of Examples 1-5, wherein the process conditions of high-pressure homogenization are changed to a homogenization pressure of 60 MPa and a homogenization number of 2 times.

[0037] Blank example

[0038] The preparation method of the blank example is basically the same as that of Example 1-5, wherein the added amount of oryzanol and cysteine ​​is 0.

[0039] Table 2 Amount of each raw material added in the composition for repairing damaged hair

[0040]

[0041]

[0042] Test Trial 1

[0043] Evaluation of the stability of compositions for repairing damaged hair

[0044] The stability of the composition for repairing damaged hair was evaluated with reference to the method in T / SHFCA 002-2021 "Guidelines for Cosmetic Stability Testing".

[0045] 1. Test items and operation steps

[0046] 1.1 Influencing factors test

[0047] 1.1.1 High temperature stability

[0048] Place the sample in a sealed clean container, and then place it in a constant temperature incubator pre-adjusted to (45℃±2℃) for 30 days. Take samples on the 5th, 10th, 20th and 30th days. After the test, return to room temperature and observe the sample color, odor, and whether there is stratification.

[0049] 1.1.2 Temperature stability

[0050] Place the sample in a sealed clean container, then place it in a constant temperature incubator pre-adjusted to (45℃±2℃), take it out after 24 hours, move it into a refrigerator pre-adjusted to (-5℃±2℃) and store it for 24 hours, then take it out, move it into a constant temperature incubator (40℃±2℃) and store it for 24 hours, then take it out again and place it in a refrigerator (-5℃±2℃) and store it for 24 hours. Repeat this cycle 5-7 times. After the test, return to room temperature and observe the sample color, odor, and whether there is stratification.

[0051] 1.2 Accelerated stability test

[0052] The samples are placed in a constant temperature and humidity chamber and tested for 6 months at 40℃±2℃ and 75%±5% relative humidity. Test at least 4 time points (such as 1, 2, 3, and 6m), return to room temperature and compare with 0m, and observe the sample color, odor, and whether there is stratification.

[0053] 1.3 Long-term stability test

[0054] The samples were placed in a constant temperature and humidity chamber and tested for 24 months at 25℃±2℃ and 60%±10% relative humidity. Samples were taken at 3, 6, 9, 12, 18, and 24m, returned to room temperature, and compared with 0m to observe the color, odor, and presence of stratification.

[0055] 2. Test results

[0056] The results of the stability evaluation test of the composition for repairing damaged hair are shown in Table 3.

[0057] Table 3 Results of stability evaluation test of the composition for repairing damaged hair

[0058]

[0059]

[0060] It can be seen from the results in Table 3 that Examples 1, 3-5 did not have any abnormalities in each stability evaluation test and had good stability. Example 2 and Comparative Example 2 will experience emulsification at high temperatures. The amount of cysteine ​​added in Example 2 is relatively high, at 1%, indicating that excessive addition of cysteine ​​will affect the stability of the emulsion. The high-pressure homogenization process of Comparative Example 2 is different from other samples. The homogenization pressure and number of times are small, and no stable nanoemulsion is formed. The aggregation of oil phase droplets leads to emulsification. The stability of the blank example is also good, indicating that the emulsification system is uniform and stable, and the selection of emulsifiers and the amount of oil added are correct.

[0061] Test Trial 2

[0062] Evaluation of combing performance of compositions for repairing damaged hair

[0063] The effect of each shampoo sample on hair combing performance was tested using a tensile tester.

[0064] 1. Materials and Reagents

[0065] Tensile tester, constant temperature and humidity incubator, damaged human hair, sodium lauryl sulfate (SLS).

[0066] 2. Operation method

[0067] 2.1 Hair treatment

[0068] Select damaged human hair of 30cm in length and 35g in weight, wet the hair with tap water, take 5mL of 10% SLS aqueous solution with a syringe, and apply 1.0g to each hair. Apply to the front and back of the hair, rub evenly, rinse with tap water to get a clean hair. Take another 5mL sample and treat the hair with the same method as above, then hang the hair on the combing machine for wet combing performance test. Test each group of hair 3 times, and test each sample twice in parallel. Remove the hair and dry it at a temperature of 25℃ and a humidity of 60%. Use the same method as above to test the dry combing performance.

[0069] 2.2 Determination steps

[0070] Use a plastic comb to comb the hair first, then fix the hair sample to be tested with a suitable clamp, place the hair bundle naturally in the middle of the comb, complete the calibration and zeroing of the instrument, start testing the hair bundle, stretch the hair bundle at a speed of 300mm / min, and move 250mm.

[0071] 3. Test results

[0072] The combing performance test results of the hair bundles treated with each sample are shown in Table 4.

[0073] Table 4 Combing performance test results of hair bundles treated with each sample

[0074]

[0075] It can be seen from the above results that the blank example has almost no improvement effect on the combing of damaged hair. However, both Examples 3 and 5 have a good improvement on the combing of damaged hair, and under the same amount of cysteine ​​added, the effect achieved by 5% oryzanol (Example 5) and 2.5% oryzanol (Example 3) is similar, indicating that there is an optimal addition ratio of oryzanol to cysteine, and oryzanol should be about 5 to 12 times of cysteine. The combing of Examples 1 and 4 is worse than that of Examples 3 and 5, because the amount of oryzanol added in Example 4 is small (1%), while the amount of cysteine ​​added in Example 1 is small (0.1%), which cannot play a good role in increasing the amount of oryzanol deposition. The role of cysteine ​​in the composition can also be seen from the results of Comparative Example 1 (the amount of cysteine ​​added is 0), indicating that cysteine ​​needs to synergize with oryzanol to play a role.

[0076] Test Trial 3

[0077] Evaluation of the hair strengthening performance of the composition for repairing damaged hair

[0078] According to the literature method [5] , test the effect of each sample on the tensile strength of damaged hair bundles, and determine its effectiveness in enhancing the strength of hair. The specific test method is: according to the number of samples, severely damaged hair bundles are selected, and they are all pre-shampooed with 10% sodium dodecyl sulfate (SLS), and naturally dried at a temperature of (25±2)℃, RH(50±5)% constant temperature and humidity conditions. After the hair bundles are completely dry, the hair bundles are treated with the same amount of sample to simulate the use of conditioner, and naturally dried at a constant temperature and humidity. Repeat the above operation ten times. After the last treatment and drying, all groups of hair bundles must be washed with deionized water to remove the samples remaining on the surface of the hair bundles, and then placed in a constant temperature and humidity environment to dry. Use a fiber strength tester to perform a single fiber strength test, and calculate and compare the tensile strength of the hair in the control group and each sample group using the following formula:

[0079] σ=F b / S o

[0080] Where σ is the tensile strength, F b is the maximum force that the sample bears when it is broken, S o is the original cross-sectional area of ​​the hair sample.

[0081] The effects of various embodiments, comparative examples and blank examples on the tensile strength of hair are shown in the following table. Figure 1As shown. The tensile strength of the untreated damaged hair bundle is the lowest, which is 170MPa. Compared with the untreated hair bundle, the tensile strength of the hair bundles treated in Examples 1, 3, 4, and 5 are increased by 12%, 28%, 16%, and 29%, respectively, indicating that the amount of oryzanol added is positively correlated with the hair toughening effect. And at the same amount of cysteine ​​added, the toughening effects of Example 3 and Example 5 are similar, indicating that there is an optimal ratio between the two, and oryzanol should be about 5 to 12 times that of cysteine. The tensile strength of the hair bundles treated in Example 1 is not increased by a high ratio, indicating that a small amount of cysteine ​​added will result in insufficient oryzanol deposition and an unobvious hair toughening effect.

[0082] The innovation of the present invention lies in the synergistic effect of oryzanol and cysteine. Since the composition is applied to a rinse-off product and the efficacy evaluation experiment is also carried out according to the use method of the rinse-off product, only the active substances remaining on the hair bundle after washing can produce the corresponding efficacy, that is, the present invention can prove the efficacy of the composition according to the results of the comparative example and the blank example.

[0083] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

[0084] Appendix: References:

[0085] [1] JPH0873324A[P].1996-03-19

[0086] [2]KR101457549B1[P].2014-11-20

[0087] [3]WO2023228977A1[P].2023-11-30

[0088] [4]DE102009043466A1[P].2011-03-31

[0089] [5] Zhang Rongwen, Jiang Riqiong, Wu Yujuan, et al. Study on the extraction of ginseng active ingredients and their effects on hair strength [J]. Guangzhou Chemical Industry, 2021, 49(08): 70-73.

Claims

1. A composition for repairing damaged hair, characterized in that: The composition is composed of the following components in weight percentage: Oryzanol 0.1-10%, cysteine ​​0.01-10%, lecithin emulsifier 1-20%, caprylic and capric triglyceride 1-50%, and the balance is deionized water.

2. A composition for repairing damaged hair according to claim 1, characterized in that: The composition is composed of the following components in weight percentage: 1-10% oryzanol, 0.1-10% cysteine, 5-20% lecithin emulsifier, 5-30% caprylic and capric triglyceride, and the balance is deionized water.

3. A composition for repairing damaged hair according to claim 2, characterized in that: The composition is composed of the following components in weight percentage: 2-5% oryzanol, 0.1-1% cysteine, 5-10% lecithin emulsifier, 10-30% caprylic and capric triglyceride, and the balance is deionized water.

4. A composition for repairing damaged hair according to claim 1, characterized in that: The lecithin emulsifier is selected from one or more of behenyl alcohol, stearyl alcohol, PEG-20 soybean sterol, cetyl alcohol, phytosterols or glyceryl stearate.

5. The method for preparing the composition according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1: Dissolve lecithin emulsifier in caprylic / decanoic acid triglyceride, heat to 60-80°C, stir evenly, add oryzanol and dissolve completely; S2: heating the deionized water to 60-80°C and keeping it warm; S3: mixing the water and oil phases, homogenizing at a speed of 5000-15000 r / min for 1-5 min to obtain a crude emulsion, and then subjecting the crude emulsion to high-pressure homogenization; S4: Cool the material to below 40°C, add cysteine ​​and the remaining water, stir evenly, and discharge the material.

6. The preparation method according to claim 5, characterized in that: In step S3, the high-pressure homogenization process conditions are a homogenization pressure of 60-100 MPa and a homogenization number of 2-5 times.

7. Use of the composition according to any one of claims 1 to 4 in the preparation of personal care products.

8. A personal care product, characterized in that: A composition for repairing damaged hair comprising the composition according to any one of claims 1 to 4.

9. The personal care product according to claim 8, characterized in that The personal care product is a shampoo product.

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