Sunscreen and ultraviolet-proof plant nutrient hair oil

Abstract

The application discloses a plant nutrient hair oil for sunscreen and ultraviolet protection, which comprises the following components in parts by weight: isododecane 15-25 parts, plant oil 10-20 parts, VP / VA copolymer 2-5 parts, cationic conditioning agent 0.1-0.25 parts, ethylhexyl methoxy cinnamate 3-8 parts, octocrylene 2-5 parts, ethylhexyl salicylate 1-3 parts, butyl methoxydibenzoylmethane 0.5-1 part, bis-ethylhexyloxyphenol methoxyphenyl triazine 0.5-1 part, and antioxidant 0.1-0.5 part. The isododecane is used for realizing rapid and uniform film formation, the plant oil is used for nourishing hair and improving gloss, the VP / VA copolymer and the cationic conditioning agent are used for improving the anti-friction and anti-water flushing capacity and improving combing smoothness, the five sunscreen agents are used for synergistically providing excellent sunscreen and ultraviolet protection effect, and the antioxidant is used for improving long-term stability. The plant nutrient hair oil for sunscreen and ultraviolet protection can provide excellent sunscreen and ultraviolet protection effect, can protect and nourish hair, can improve gloss, is convenient to use, and has a refreshing experience.

Description

Technical Field

[0001] This invention relates to the field of cosmetic technology, specifically to a plant-based nutritional hair care product that provides sun protection and UV protection. Background Technology

[0002] Hair oil is a long-established type of hair care product. It forms a protective film by coating the hair surface with oily ingredients, which moisturizes and closes the hair cuticles, reducing moisture loss, increasing hair shine, and improving combability. Traditional hair oils mainly use mineral oil and plant oils as raw materials and are applied to the hair by smearing to provide basic moisturizing and conditioning effects.

[0003] In recent years, with increasing consumer awareness of hair health and in-depth research on the damage of ultraviolet (UV) radiation to hair, the issue of photodamage to hair has received growing attention. UV radiation not only harms the skin but also causes irreversible damage to hair structure. Studies have shown that UV radiation can cause photodegradation of cysteine ​​in hair keratin, making hair brittle and inelastic, while also accelerating the fading of hair pigment, resulting in lighter hair color and loss of shine. Therefore, developing products that combine hair care and sun protection functions has become an important research direction in the field of hair care.

[0004] Chinese patent CN102406558A, "A Plant-Based Nourishing Hair Oil," discloses a plant-based nourishing hair oil comprising liquid paraffin, coix seed oil, tallow tree seed oil, and almond oil, among other components. It applies the medicinal value of coix seed to the hair oil, aiming to nourish hair, making it smooth and soft, and also providing sun protection and UV protection. However, the total oil content is as high as approximately 93%, resulting in a thick and sticky texture. After application, hair tends to become flat and attracts dust. It requires applying the oil by hand, which is inconvenient and makes even coverage difficult, especially in densely haired areas, leading to a poor user experience. Furthermore, this hair oil relies solely on the UV absorption capacity of the natural components in coix seed oil for sun protection. The sun protection efficacy of relying solely on the natural active ingredients in plant oils is extremely limited, failing to meet consumers' demand for effective sun protection in hair products.

[0005] Therefore, it is of great significance to develop a plant-based nourishing hair oil that can provide excellent sun protection and UV protection for hair, while also being convenient to use and offering a refreshing experience, as well as its preparation method. Summary of the Invention

[0006] The purpose of this invention is to provide a plant-based nourishing hair oil with sun protection and UV protection, and its preparation method, in order to solve the problems mentioned in the background art, such as the thick and sticky texture of existing plant-based nourishing hair oils, poor user experience, and difficulty in meeting consumers' needs for effective sun protection in hair products.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A plant-based nourishing hair oil with sun protection and UV protection, comprising the following components by weight: 15-25 parts isododecane, 10-20 parts plant oil, 2-5 parts VP / VA copolymer, 0.1-0.25 parts cationic conditioner, 3-8 parts ethylhexyl methoxycinnamate, 2-5 parts octocrylene, 1-3 parts ethylhexyl salicylate, 0.5-1 part butyl methoxydibenzoylmethane, 0.5-1 part bis-ethylhexyloxyphenol methoxyphenyl triazine, and 0.1-0.5 parts antioxidant.

[0008] Preferably, the vegetable oil is one or more of meadowfoam seed oil, grape seed oil, and jojoba oil.

[0009] Preferably, the cationic conditioner is behenryltrimethylammonium chloride.

[0010] Preferably, the antioxidant is one or more of tocopherol, tocopheryl acetate, and tea polyphenol palmitate.

[0011] Preferably, it also includes 0.1-0.5 parts of fragrance.

[0012] Preferably, the plant-based hair oil is in the form of an aerosol, and the pressurized packaging contains a propellant.

[0013] Preferably, the propellant is dimethyl ether, propane, or a mixture of dimethyl ether and HFO-1234ze.

[0014] Preferably, the propellant charge is 30-50% of the total spray weight.

[0015] In addition, the present invention also provides a method for preparing a plant-based nourishing hair oil that provides sun protection and UV protection.

[0016] A method for preparing a sun-protective and UV-protective plant-based hair oil according to any one of the above claims includes the following steps: S1. Weigh each component according to the required ratio, mix isododecane and vegetable oil, slowly add VP / VA copolymer and cationic conditioning agent under stirring at room temperature, continue stirring until completely dissolved, add ethylhexyl methoxycinnamate, octocrylene, ethylhexyl salicylate, butyl methoxydibenzoylmethane, and bis-ethylhexyloxyphenol methoxyphenyl triazine in sequence, stir and mix, add antioxidant, mix evenly, filter to obtain the liquid; S2. The liquid obtained in S1 is bottled and filled with propellant to obtain the sun-protective and UV-protective plant-based hair oil.

[0017] Preferably, the preparation methods are all carried out at 20-35℃.

[0018] Compared with the prior art, the beneficial effects of the present invention are: This invention relates to a sunscreen and UV-protective plant-based nourishing hair oil, composed of isododecane, plant oil, VP / VA copolymer, cationic conditioner, five sunscreen agents, and antioxidants. Isododecane, as a low-viscosity volatile carrier, dissolves the non-volatile components in the system into a homogeneous, transparent liquid, giving the liquid excellent aerosol spray performance. Simultaneously, it rapidly evaporates upon spraying onto the hair surface, spreading the non-volatile components in a uniform, thin layer on the hair cuticle surface, forming a uniform, continuous film in situ on the hair surface. This avoids the localized accumulation and stickiness associated with direct application of high-oil systems, ensuring convenient use and a refreshing experience. Natural plant nutrients are adsorbed onto the hair cuticle surface and intercuticle spaces through hydrophobic interactions and van der Waals forces, forming a lubricating layer between keratinocytes. This fills micro-cracks and voids caused by washing, hot blow-drying, or UV damage, nourishing the hair, enhancing shine, and improving combing smoothness. The VP / VA copolymer and cationic conditioner form a "physical film-forming anchoring +..." The dual locking mechanism of "electrostatic chemical anchoring" anchors sunscreen agents and plant oils to the hair cuticle surface, enhancing resistance to friction and water erosion. Simultaneously, the cationic conditioning agent eliminates static electricity and improves combing smoothness. Of the five sunscreen agents, ethylhexyl methoxycinnamate and octocrylene cover UVB, while butyl methoxydibenzoylmethane and bis-ethylhexyloxyphenol methoxyphenyl triazine absorb UVA. These two have spectral overlap around 320nm, forming a seamless broad-spectrum absorption band covering the conventional UV protection range. Octoccrylene not only absorbs UVB itself, but more importantly, through a triplet-triplet energy transfer mechanism, it non-radiatively transfers the active triplet energy formed by butyl methoxydibenzoylmethane after photoexcitation to itself, avoiding Norrish type I cleavage (breaking α-diketone bonds) and Norrish... Irreversible photodegradation reactions such as type II cleavage (intramolecular hydrogen abstraction) significantly improve the photostability of butylmethoxydibenzoylmethane. Bis-ethylhexyloxyphenol methoxyphenyl triazine also forms a ground-state complex with butylmethoxydibenzoylmethane through intermolecular hydrogen bonds, shifting the enol-keto tautomerism equilibrium of butylmethoxydibenzoylmethane towards the UV-absorbing enol form, while simultaneously reducing the probability of photochemical reactions after excitation, further enhancing the system's photostability. Ethylhexyl salicylate, while acting as a UVB absorber, also possesses a polar ester structure that... The specific solvation ability of crystalline sunscreens allows the system to be prepared at room temperature while retaining the activity of the sunscreens. Antioxidants preferentially react with free radicals, providing "sacrificial protection" for easily oxidized components such as plant oils and butyl methoxydibenzoylmethane in the system, increasing the stability of the system and maintaining stability during long-term storage. Through the synergistic cooperation of various components, multiple synergistic effects are achieved, resulting in a plant-based nourishing hair oil that provides excellent sun protection and UV protection for hair, while also conditioning and nourishing the hair, enhancing its shine, and offering convenient use and a refreshing experience. Detailed Implementation

[0019] To better illustrate the objectives, technical solutions, and advantages of this invention, the following embodiments are provided. Obviously, the following embodiments are only a part of the embodiments of this invention, and not all of them; these embodiments do not imply any limitation on this invention. Those skilled in the art should understand that these embodiments are only used to illustrate the technical effects of this invention, and not to limit the scope of protection of this invention.

[0020] Experimental methods in the following examples, unless otherwise specified, are generally performed under standard conditions or as recommended by the manufacturer. These examples are primarily intended to provide a better understanding of the analytical methods of this invention and do not exhaustively cover all possible procedures.

[0021] All raw materials used in the examples are commercially available; unless otherwise specified, the reagents, methods and equipment used in this invention are conventional reagents, methods and equipment in this technical field.

[0022] Example 1 A method for preparing a plant-based nourishing hair oil with sun protection and UV protection includes the following steps: S1. Weigh each component according to the required ratio. Add 20 parts of isododecane, 10 parts of meadowfoam seed oil, and 6 parts of jojoba oil to a clean and dry stainless steel mixing vessel. Turn on the anchor stirrer and control the speed at 30 rpm. Stir and mix. Under the stirring condition at room temperature (25℃), slowly add 2.5 parts of VP / VA copolymer and 0.2 parts of behenyltrimethylammonium chloride. Continue stirring for 20 minutes until completely dissolved. Add 5 parts of ethylhexyl methoxycinnamate, 3 parts of octocrylene, 2 parts of ethylhexyl salicylate, 1 part of butyl methoxydibenzoylmethane, and 0.8 parts of bis-ethylhexyloxyphenol methoxyphenyl triazine. Continue stirring and mixing at room temperature (25℃) for 10 minutes. Add 0.2 parts of tocopherol and 0.2 parts of fragrance. Mix evenly and stir until the system is completely homogeneous and transparent. Filter through a 200-mesh nylon filter bag to remove trace mechanical impurities and obtain the liquid. S2. The liquid obtained in S1 is filled into an aluminum aerosol can with an epoxy phenolic inner coating, and 40% of the total spray weight of dimethyl ether propellant is added to obtain the sunscreen and UV protection plant-based hair oil.

[0023] Example 2 A method for preparing a plant-based nourishing hair oil with sun protection and UV protection includes the following steps: S1. Weigh each component according to the required ratio. Add 16 parts of isododecane, 6 parts of meadowfoam seed oil, and 4 parts of grape seed oil to a clean and dry stainless steel mixing tank. Turn on the anchor stirrer and control the speed at 30 rpm. Stir and mix. Under the stirring condition at room temperature (25℃), slowly add 3 parts of VP / VA copolymer and 0.1 parts of behenyltrimethylammonium chloride. Continue stirring for 20 minutes until completely dissolved. Add 4 parts of ethylhexyl methoxycinnamate, 3 parts of octocrylene, 2 parts of ethylhexyl salicylate, 0.8 parts of butyl methoxydibenzoylmethane, and 0.7 parts of bis-ethylhexyloxyphenol methoxyphenyl triazine. Continue stirring and mixing at room temperature (25℃) for 10 minutes. Add 0.2 parts of tocopheryl acetate and 0.3 parts of fragrance. Mix evenly and stir until the system is completely homogeneous and transparent. Filter through a 200-mesh nylon filter bag to remove trace mechanical impurities and obtain the liquid. S2. The liquid obtained in S1 is filled into an aluminum aerosol can with an epoxy phenolic inner coating, and 40% of the total spray weight of dimethyl ether and HFO-1234ze mixture propellant is added to obtain the sunscreen and UV protection plant-based hair oil.

[0024] Example 3 A method for preparing a plant-based nourishing hair oil with sun protection and UV protection includes the following steps: S1. Weigh each component according to the required ratio. Add 24 parts of isododecane, 10 parts of meadowfoam seed oil, 4 parts of grape seed oil, and 6 parts of jojoba oil to a clean and dry stainless steel mixing vessel. Turn on the anchor stirrer and control the speed at 30 rpm. Stir and mix. Under the stirring condition at room temperature (25℃), slowly add 4 parts of VP / VA copolymer and 0.2 parts of behenyltrimethylammonium chloride. Continue stirring for 20 minutes until completely dissolved. Add 7 parts of ethylhexyl methoxycinnamate, 4 parts of octocrylene, 2 parts of ethylhexyl salicylate, 1 part of butyl methoxydibenzoylmethane, and 0.8 parts of bis-ethylhexyloxyphenol methoxyphenyl triazine. Continue stirring and mixing at room temperature (25℃) for 10 minutes. Add 0.4 parts of tea polyphenol palmitate and 0.5 parts of fragrance. Mix evenly and stir until the system is completely homogeneous and transparent. Filter through a 200-mesh nylon filter bag to remove trace mechanical impurities and obtain the liquid. S2. The liquid obtained in S1 is filled into an aluminum aerosol can with an epoxy phenolic inner coating, and 40% of the total spray weight of cosmetic-grade propane propellant is added to obtain the sunscreen and UV protection plant-based hair oil.

[0025] Comparative Example 1 A method for preparing a plant-based nourishing hair oil includes the following steps: S1. Weigh each component according to the required ratio. Add 20 parts of isododecane, 10 parts of meadowfoam seed oil, and 6 parts of jojoba oil to a clean and dry stainless steel mixing tank. Turn on the anchor stirrer and control the speed at 30 rpm. Stir and mix. Under the stirring condition of room temperature 25℃, slowly add 2.5 parts of ethylene / vinyl acetate copolymer and 0.2 parts of behenyltrimethylammonium chloride. Continue stirring for 20 minutes. Then add 5 parts of ethylhexyl methoxycinnamate, 3 parts of octocrylene, 2 parts of ethylhexyl salicylate, 1 part of butyl methoxydibenzoylmethane, and 0.8 parts of bis-ethylhexyloxyphenol methoxyphenyl triazine. Continue stirring and mixing at room temperature 25℃ for 10 minutes. Add 0.2 parts of tocopherol and 0.2 parts of fragrance. Mix to obtain an unusable turbid liquid. The ethylene / vinyl acetate copolymer does not dissolve at room temperature and cannot obtain a uniform and transparent liquid, making it impossible to fill normally. This turbid liquid is the plant nutrient hair oil.

[0026] The main difference in this comparative example 1 is that the VP / VA copolymer is replaced with an ethylene / vinyl acetate copolymer.

[0027] Comparative Example 2 A method for preparing a plant-based nourishing hair oil, the steps not specifically described are generally the same as in Example 1, the main difference being: The amount of VP / VA copolymer used in this comparative example is insufficient.

[0028] Comparative Example 3 A method for preparing a plant-based nourishing hair oil, the steps not specifically described are generally the same as in Example 1, the main difference being: The comparative example used an excessive amount of VP / VA copolymer.

[0029] Comparative Example 4 A method for preparing a plant-based nourishing hair oil, the steps not specifically described are generally the same as in Example 1, the main difference being: This comparative example does not contain any cationic conditioners.

[0030] Comparative Example 5 A method for preparing a plant-based nourishing hair oil, the steps not specifically described are generally the same as in Example 1, the main difference being: This comparative example does not contain ethylhexyl methoxycinnamate.

[0031] Comparative Example 6 A method for preparing a plant-based nourishing hair oil, the steps not specifically described are generally the same as in Example 1, the main difference being: This comparative sample does not contain octocrylene.

[0032] Comparative Example 7 A method for preparing a plant-based nourishing hair oil, the steps not specifically described are generally the same as in Example 1, the main difference being: This comparative example does not contain ethylhexyl salicylate.

[0033] Comparative Example 8 A method for preparing a plant-based nourishing hair oil, the steps not specifically described are generally the same as in Example 1, the main difference being: This comparative example does not contain butyl methoxydibenzoylmethane.

[0034] Comparative Example 9 A method for preparing a plant-based nourishing hair oil, the steps not specifically described are generally the same as in Example 1, the main difference being: This comparative example does not contain bis-ethylhexyloxyphenol methoxyphenyl triazine.

[0035] Comparative Example 10 A method for preparing a plant-based nourishing hair oil, the steps not specifically described are generally the same as in Example 1, the main difference being: No antioxidants were added to this comparative sample.

[0036] Comparative Example 11 A method for preparing a plant-based nourishing hair oil includes the following steps: S1. Weigh each component according to the required ratio. Add 20 parts of isododecane, 10 parts of meadowfoam seed oil, and 6 parts of jojoba oil to a clean and dry stainless steel mixing vessel. Turn on the anchor stirrer and control the speed at 30 rpm. Stir and mix. Under stirring at 60°C, slowly add 2.5 parts of VP / VA copolymer and 0.2 parts of behenyltrimethylammonium chloride. Continue stirring for 20 minutes until completely dissolved. Add 5 parts of ethylhexyl methoxycinnamate, 3 parts of octocrylene, 2 parts of ethylhexyl salicylate, 1 part of butyl methoxydibenzoylmethane, and 0.8 parts of bis-ethylhexyloxyphenol methoxyphenyl triazine. Continue stirring and mixing at 60°C for 10 minutes. Cool to 45°C, add 0.2 parts of tocopherol and 0.2 parts of fragrance, mix evenly, and stir until the system is completely homogeneous and transparent. Filter through a 200-mesh nylon filter bag to remove trace mechanical impurities and obtain the liquid. S2. The liquid obtained in S1 is filled into an aluminum aerosol can with an epoxy phenolic inner coating, and then filled with dimethyl ether propellant at 40% of the total spray weight to obtain the plant nutrient hair oil.

[0037] The main difference between this comparative example and Example 1 is that this comparative example was prepared at high temperature.

[0038] Performance testing: Since the ethylene / vinyl acetate copolymer in Comparative Example 1 is insoluble at room temperature and cannot yield a uniform and transparent liquid, it cannot be filled normally; therefore, it was not tested. Performance tests were conducted on Examples 1-3 and Comparative Examples 2-11, and the specific test methods are as follows: Sun Protection Factor (SPF) The sun protection factor (SPF) of sunscreen cosmetics was determined according to the "Determination Method" in the "Cosmetic Safety Technical Specifications" (2015 edition). Ten healthy subjects aged 18-60 years with skin types I-III (sensitive to ultraviolet radiation) were selected. A test area was marked on the back of each subject, and an application rate of 2.0 ± 0.1 mg / cm² was applied. 2 The sample was evenly sprayed onto the designated area using the appropriate amount of UV light. A xenon arc lamp solar simulator (290-400nm) was used as the irradiation source, and the subject's back skin was irradiated with a geometrically increasing UV dose. The minimum erythema dose (MED) was observed and determined 16-24 hours after irradiation.

[0039] SPF = Mean MED of Protected Skin / Mean MED of Unprotected Skin Long-wave ultraviolet protection index (PFA value) The determination of the long-wave ultraviolet protection index (PFA value) of sunscreen cosmetics was conducted in accordance with the "Determination Method of Long-wave Ultraviolet Protection Index (PFA value) of Sunscreen Cosmetics" (2015 edition). Ten healthy subjects with easily tanned skin were selected, and test areas were marked on their backs. UVA light (320-400nm) was used for irradiation, and the PFA value was calculated by comparing the minimum sustained melanization (MPPD) of protected and unprotected skin.

[0040] PFA = Mean MPPD of protected skin / Mean MPPD of blank skin UV protection Take 1g of sample and spray it evenly onto 3M latex tape. Place it in a 37℃ constant temperature oven for 20min. Take it out and attach it to the light-transmitting side of a quartz cuvette. Use a UV spectrophotometer to detect the UV absorption value in the 280-400nm wavelength range. Obtain a UV absorption value every 10nm UV wavelength. The UV absorption value of a certain wavelength range is the average UV absorption value of all points in that wavelength range.

[0041] Waterproof performance test The water resistance performance of sunscreen cosmetics was tested according to the "Cosmetic Safety Technical Specifications" (2015 edition). After applying the sunscreen, subjects spent two 20-minute sessions (total 40 minutes) in water at a temperature controlled between 23-32℃. The test area was not allowed to be wiped during the test. After the water activity, subjects were allowed to air dry (without wiping), and then the SPF value after bathing was measured again according to the SPF value determination method. The SPF retention rate was calculated.

[0042] SPF retention rate (%) = (Mean SPF after bathing / Mean SPF before bathing) × 100% Sunscreen photostability The content of sunscreen agents was determined according to the method for determination of sunscreen agent content (high performance liquid chromatography) in the "Cosmetic Safety Technical Specifications" (2015 edition). Samples from each example and comparative example were uniformly sprayed onto a quartz glass plate, with the film thickness controlled at 1.0 ± 0.1 mg / cm². 2 A xenon arc lamp solar simulator (wavelength 290-400nm) was used with a standard solar dose (250W / m²). 2 The cumulative irradiation energy is 250 kJ / m². 2 The samples were irradiated with light equivalent to approximately 4 hours of standard sunlight exposure. After irradiation, samples were collected, and the content of butyl methoxydibenzoylmethane (avobenzone) was determined by high-performance liquid chromatography (HPLC).

[0043] Avobenzone retention rate (%) = (Avobenzone content after illumination / Avobenzone content before illumination) × 100% The specific sun protection and UV protection test results of Examples 1-3 and Comparative Examples 2-11 are shown in the table below: Table 1. Specific sun protection and UV protection test results of Examples 1-3 and Comparative Examples 2-11 As shown in Table 1, the sunscreen and UV protection plant-based hair oils prepared in Examples 1-3 of this invention all have excellent sunscreen and UV protection properties, with an SPF value of not less than 35, a PFA value as high as 18.5, absorbance for UVA and UVB of more than 1.45 and 2.10 respectively, SPF retention rate after bathing of not less than 75%, good water rinsing ability, avobenzone retention rate of up to 90%, and excellent photostability.

[0044] In contrast, the amount of VP / VA copolymer in Comparative Example 2 was insufficient, failing to form a continuous protective film on the hair surface. The sunscreen agent was unevenly distributed and could not be effectively anchored, resulting in sunscreen agent accumulation in some areas and exposure in others. The overall sun protection efficiency decreased, with SPF dropping to 22, PFA dropping to 9, UVA absorbance to 1.12, UVB absorbance to 1.68, and SPF retention rate after bathing at 62% and avobenzone retention rate at 78%, all of which were significantly reduced.

[0045] Comparative Example 5, without the addition of ethylhexyl methoxycinnamate, showed a significant decrease in sun protection performance, with an SPF value of only 26. It provided insufficient UVB protection, with UVB absorbance dropping to 1.8. After bathing, the SPF retention rate was 68%, and the water resistance was also reduced.

[0046] Comparative Example 6, without the addition of octocrylene, reduced some UVB absorption, and the UVB absorbance dropped to 1.9. In the absence of octocrylene, the triplet energy of avobenzone was transferred to itself in a non-radiative manner through triplet-triplet energy transfer, resulting in a large degradation of avobenzone and a sharp drop in the avobenzone retention rate to 48%, rendering the photostable system completely ineffective.

[0047] Comparative Example 7, without the addition of ethylhexyl salicylate, showed a decrease in the polarity of the composite solvent system. Some crystalline sunscreens could not be completely dissolved at room temperature and were suspended in the form of microcrystals. After standing for 24 hours, they gradually precipitated out and could not effectively absorb ultraviolet rays, resulting in a reduction in both sun protection and UV protection performance.

[0048] Comparative Example 8, without the addition of butyl methoxydibenzoylmethane (avobenzone), lacked the main UVA absorber, resulting in a decrease in SPF to 29, PFA to 4.0, UVA absorbance to 0.52, and UVB absorbance to 1.42. This significantly reduced its sun protection and UV protection performance, making it insufficient to provide effective protection.

[0049] Comparative Example 9, without the addition of bis-ethylhexyloxyphenol methoxyphenyl triazine, lacked a broad-spectrum ultraviolet absorber, resulting in a significant decrease in both UVA and UVB absorbance. At the same time, it lost its ability to reduce the photochemical reactivity of avobenzone through intermolecular hydrogen bonds, leading to a significant decrease in photostability and a reduction in avobenzone retention to 68%.

[0050] Comparative Example 10, without added antioxidants, lacks antioxidants and provides "sacrificial protection" by preferentially reacting with free radicals. Avobenzone is partially photo-oxidatively degraded, resulting in a decrease in avobenzone retention.

[0051] The preparation methods of Comparative Example 11 were all carried out under high temperature conditions, and the avobenzone partially underwent thermal degradation, resulting in a decrease in its sun protection and UV protection performance.

[0052] Hair product combing performance The test was conducted according to T / GDCDC 022-2022, "Test Method for Hair Combing Efficacy". A standardized human hair bundle (approximately 20cm in length and 3g in weight) was taken and equilibrated for 24 hours in a constant temperature and humidity environment of 22±1℃ and 50±5% relative humidity. The hair bundle was fixed on the combing tester, and the test comb was installed on the movable part of the tension meter. The force required to comb from the top to the bottom was measured. Each hair bundle was tested three times, and the overall average combing force of the hair bundle was recorded. First, the combing force of the untreated hair bundle was measured, and then the sample was tested at 2.0mg / cm². 2 Apply the product evenly to the surface of the hair strands, let it air dry naturally, and then measure the combing force again.

[0053] Carding power reduction rate (%) = (Bare carding power - Treated carding power) / Blank carding power × 100% Antistatic properties of hair products Standardized human hair bundles were equilibrated in a constant temperature and humidity environment for 24 hours. Then, a friction device (a roller wrapped with a standard friction cloth) was used to rub the hair bundles back and forth 10 times at a constant speed to generate static charge. The electrostatic voltage immediately after friction (blank value) and the electrostatic voltage after sample treatment were measured using an electrostatic meter.

[0054] Antistatic rate (%) = (Blank electrostatic voltage - Treated electrostatic voltage) / Blank electrostatic voltage × 100% Hair product gloss The test was conducted according to ASTM D523, "Standard Test Method for Specular Gloss". A standard hair bundle with a length of 20 cm and a weight of 0.5 g was taken, washed with 2% sodium dodecyl sulfate solution, rinsed with water, and air-dried. 0.4 g of the test sample was weighed and evenly sprayed onto the surface of the hair bundle. After combing, it was air-dried for 30 minutes at 25℃±1℃ and 50%±5% relative humidity. The gloss values ​​at five different locations in the middle section of the hair bundle were measured using a gloss meter (60° angle, 60° incident angle, 60° receiving angle), and the average value was taken. The relative gloss was calculated using the gloss value of the untreated hair bundle as a baseline (set as 100%). The test was repeated three times, and the average value was taken.

[0055] Hair care effect (breakage resistance) A single healthy hair strand, 10 cm in length, was taken and equilibrated for 24 hours at 20℃±1℃ and 50%±5% relative humidity. The breaking strength of the hair strand was measured using a fiber strength tester (clamping distance 5 cm, tensile speed 20 mm / min). The average value of 20 strands was used as an untreated control. A hair bundle from the same source was taken, and 0.5 g of the sample was evenly sprayed onto the surface of the hair bundle. After natural drying, 20 hair strands were taken from the bundle, and the breaking strength of the treated strand was measured using the same method as above.

[0056] Fracture strength retention rate = (fracture strength after treatment / fracture strength without treatment) × 100% Oiliness test Ten trained sensory evaluation team members (aged 25-45, 8 women and 2 men, hair types ranging from fine / soft to medium / coarse) were selected for testing in an environment of 25℃±1℃ and relative humidity of 50%±5%. A standard hair strand, 20cm in length and weighing 0.5g, was used. 0.2g of the test sample was evenly sprayed onto the surface of the hair strand from a distance of 15cm, combed evenly, and left to rest naturally for 5 minutes. Team members gently touched the middle section of the hair strand with their index finger and thumb, rating it on a scale of 1-5: 1 point = noticeably oily, fingers have noticeable shine; 2 points = moderately oily, fingers have slight shine; 3 points = slightly oily, fingers have almost no shine; 4 points = dry, no oiliness; 5 points = very dry, silky and powdery feel. The test was repeated 3 times, and the average value was taken.

[0057] The specific hair care and hair growth test results of Examples 1-3 and Comparative Examples 2-11 are shown in the table below: Table 2. Specific hair care and hair growth test results of Examples 1-3 and Comparative Examples 2-11 As shown in Table 1, the sunscreen and UV-protective plant-based hair oils prepared in Examples 1-3 of this invention all have excellent hair care and nourishing properties. The combing power reduction rate is not less than 35%, the antistatic rate is higher than 55%, the relative gloss can reach 142%, the breakage strength retention rate is not less than 105%, the greasiness score is not less than 4, combing is smooth, antistatic and anti-frizz, enhances gloss, hair strands are soft and resilient to breakage, and the user experience is refreshing and non-greasy.

[0058] In contrast, the amount of VP / VA copolymer in Comparative Example 2 was insufficient, resulting in a lack of a smooth polymer lubricating layer on the hair surface, increased combing resistance, a 35% reduction in combing power, a mere 18% increase in gloss, decreased electrostatic adsorption efficiency and distribution uniformity on the hair surface, weakened antistatic effect, and an antistatic rate of 50%. When film formation was insufficient, the hair not only failed to be protected but also suffered slight photosensitive damage due to direct contact of the sunscreen agent with the hair surface, and the break strength retention rate was less than 100%.

[0059] In Comparative Example 3, the excessive amount of VP / VA copolymer and the excessively thick film significantly increased the rigidity of the hair strands. During combing, the hair strands became harder and partially bonded and hardened, resulting in a combing power reduction rate of only 30%.

[0060] Comparative Example 4: Without the addition of cationic conditioning agent, the hair strands in the dry environment generate a large amount of static charge due to friction that cannot be neutralized, resulting in flyaways and difficulty in combing. Although the physical film of VP / VA copolymer exists, it loses its electrostatic chemical anchoring with the hair cuticle, and the film adhesion is greatly reduced. It is very easy to peel off during combing, and the combing power reduction rate drops to 15%, with an antistatic rate of only 12%.

[0061] Comparative Example 10 did not add antioxidants. The lack of antioxidants provides "sacrificial protection" by preferentially reacting with free radicals. The small amount of polyunsaturated fatty acids in the vegetable oil are attacked by oxygen during storage and undergo a chain of auto-oxidation reactions, which darkens the color of the liquid, affects the appearance, reduces the stability of the system, and increases the greasiness.

[0062] In Comparative Example 11, the preparation methods were all carried out under high temperature conditions. A small amount of polyunsaturated fatty acids in the vegetable oil underwent a thermal oxidation reaction, generating oxidation products with conjugated double bond structures and brown pigments, which caused the liquid to turn dark yellow. Part of the isododecane volatilized, and the proportion of non-volatile substances in the system increased, resulting in a significant increase in greasiness.

[0063] In summary, this invention produces a plant-based nourishing hair oil with sun protection and UV protection by using isododecane, plant oil, VP / VA copolymer, cationic conditioning agent, five sunscreen agents, and antioxidants. Isododecane enables rapid evaporation and uniform film formation; plant oil nourishes hair strands and enhances shine; VP / VA copolymer and cationic conditioning agent enhance anti-friction and water erosion resistance, eliminate static electricity and flyaways, and improve combing smoothness; the five sunscreen agents work synergistically to form a seamless broad-spectrum absorption band, covering the range of conventional UV protection, and providing excellent sun protection and UV protection for hair in a long-lasting and stable manner; antioxidants enhance long-term stability. The result is a plant-based nourishing hair oil that not only provides excellent sun protection and UV protection for hair, but also nourishes and protects hair, enhances shine, and is convenient to use with a refreshing feel.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A plant-based nourishing hair oil with sun protection and UV protection, characterized in that, By weight, it comprises the following components: 15-25 parts isododecane, 10-20 parts vegetable oil, 2-5 parts VP / VA copolymer, 0.1-0.25 parts cationic conditioner, 3-8 parts ethylhexyl methoxycinnamate, 2-5 parts octocrylene, 1-3 parts ethylhexyl salicylate, 0.5-1 part butyl methoxydibenzoylmethane, 0.5-1 part bis-ethylhexyloxyphenol methoxyphenyl triazine, and 0.1-0.5 parts antioxidant.

2. The plant-based nourishing hair oil with sun protection and UV protection according to claim 1, characterized in that: The vegetable oil is one or more of meadowfoam seed oil, grape seed oil, and jojoba oil.

3. The plant-based nourishing hair oil with sun protection and UV protection according to claim 1, characterized in that: The cationic conditioner is behenryltrimethylammonium chloride.

4. The plant-based nourishing hair oil with sun protection and UV protection according to claim 1, characterized in that: The antioxidant is one or more of tocopherol, tocopheryl acetate, and tea polyphenol palmitate.

5. The plant-based nourishing hair oil with sun protection and UV protection according to claim 1, characterized in that: It also includes 0.1-0.5 parts of fragrance.

6. A plant-based nourishing hair oil with sun protection and UV protection according to any one of claims 1-5, characterized in that: The plant-based hair oil is in the form of an aerosol, and the pressurized packaging contains a propellant.

7. The plant-based nourishing hair oil with sun protection and UV protection according to claim 6, characterized in that: The propellant is dimethyl ether, propane, or a mixture of dimethyl ether and HFO-1234ze.

8. The plant-based nourishing hair oil with sun protection and UV protection according to claim 6, characterized in that: The propellant charge is 30-50% of the total spray weight.

9. A method for preparing a sunscreen and UV-protective plant-based hair oil according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Weigh each component according to the required ratio, mix isododecane and vegetable oil, slowly add VP / VA copolymer and cationic conditioning agent under stirring at room temperature, continue stirring until completely dissolved, add ethylhexyl methoxycinnamate, octocrylene, ethylhexyl salicylate, butyl methoxydibenzoylmethane, and bis-ethylhexyloxyphenol methoxyphenyl triazine in sequence, stir and mix, add antioxidant, mix evenly, filter to obtain the liquid; S2. The liquid obtained in S1 is bottled and filled with propellant to obtain the sun-protective and UV-protective plant-based hair oil.

10. The method for preparing a sunscreen and UV-protective plant-based hair oil according to claim 9, characterized in that: All preparation methods were carried out at 20-35℃.

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