Moisturizing and nourishing bath oil and preparation method thereof

Abstract

The present invention discloses a moisturizing bath oil and a preparation method thereof, relating to the technical field of daily chemical products. The moisturizing bath oil is composed of the following components in percentage by weight: 32% to 45% surfactant, 10% to 18% synthetic oil, 25% to 30% glycerin, 0.35% to 1.5% natural plant oil, 0.5% to 4% non-ionic thickener, 0.1% to 3.5% fragrance, 0.01% to 1% rose water, 0.2% to 1% preservative, 0.1% to 2% citric acid, and the balance being deionized water. The moisturizing bath oil of the present invention utilizes a compound of an amphoteric surfactant and a nonionic surfactant to impart a suitable mild cleansing power and foaming effect to the bath oil; the rational combination of synthetic oil, glycerin, and natural plant oil ensures a moisturizing and warming sensation during bathing.

Description

Technical Field

[0001] The present invention relates to the technical field of daily chemical products, in particular to a moisturizing bath oil and a preparation method thereof. Background Art

[0002] As people's pace of life accelerates, demand for diversified bath products is also increasing. They need products that not only lather well and provide excellent cleansing power, but also provide gentle scrubbing and post-wash nourishment without causing irritation or damage. "Using oils to nourish the skin" has been one of the most notable consumer trends in the Chinese beauty market in recent years. Consumers are increasingly willing to try oil-based products such as makeup removers, moisturizers, body oils, and massage oils. These categories present significant growth potential, and bath oils are one of them. And traditional bath preparation is mainly divided into two classes, one class is the soap base formed by high temperature saponification of fatty acid and strong alkali (such as potassium hydroxide or sodium hydroxide) or the saponification type shower gel formed by compounding other acceptable components, but this type of shower gel smells big, alkaline and degreasing power are super strong, easily cause dry skin, tightness and itching etc. after bathing; another class is the surface active shower gel formed by compounding other acceptable components of surfactant, in this type of shower gel, part of surfactant degreasing power is strong, after washing, there is not refreshing enough, residual problem, and then cause large irritation to skin, long-term use can destroy the sebum film on the skin, make the natural barrier of skin subject to certain damage, and make skin become fragile, dry, cause multiple skin problems. Therefore, after bathing, often need to apply skin care products such as body lotion, body oil to alleviate above-mentioned skin problems. Bath oil containing grease component is gradually liked by people as the toiletries for daily use, and bath oil gradually occupies a part of market in recent years.

[0003] With the continuous research and development of body care products, numerous reports have been published on the composition and preparation methods of bath oils. Chinese invention patent CN112494369A discloses a bath oil and its preparation method, which is primarily prepared from plant oils, detergents, emulsifiers, and antioxidants. The bath oil is claimed to have an excellent refreshing rinse effect and is gentle and non-irritating. However, due to the inclusion of a relatively high amount of emulsifier, the detergent and plant oil content in this bath oil is reduced. While it has both moisturizing and cleansing effects, both effects are not particularly prominent, and the foam volume is relatively low, giving the illusion that the bath oil is not fully rinsed. Furthermore, Chinese invention patent CN115381737A discloses a moisturizing, multi-foaming bath oil and its preparation method. The bath oil comprises 30-50% of a lauryl alcohol polyether mixture, 25-30% of a plant essential oil mixture, 1-2% of a polyol mixture, 2-4% of a fragrance, and a balance of an oil ester mixture, resulting in excellent foam volume and moisturizing properties. Chinese invention patent CN116421504A discloses a high-foaming, high-moisture bath oil for relieving dermatitis and its preparation method. The bath oil comprises sunflower seed oil, perilla seed oil, and ginger root oil in combination with surfactants and emollients to achieve moderate cleansing power and high foaming power. It also maintains the skin's oil balance, improves skin dehydration, and increases skin lubrication. It also has the beneficial effects of improving skin inflammation and eczema, and repelling mites and bacteria. Although both of the above bath oils achieve moderate cleansing power, foam quality, and post-wash moisturizing properties, they are found to contain a high amount of oil during rinsing, resulting in a strong greasy feeling. They are slow to rinse and require repeated scrubbing, failing to meet the needs of young people for a hydrating and refreshing product.

[0004] Therefore, there is an urgent need to develop a moisturizing bath oil that has moderate cleaning power, good foam texture, moisturizing without being greasy during washing, and long-lasting moisturizing after washing, which can moisturize the skin and meet the user's needs while maintaining a good washing feeling. Summary of the Invention

[0005] To solve the above problems, the present invention provides a moisturizing bath oil and a preparation method thereof, which specifically include the following technical solutions:

[0006] In a first aspect, a moisturizing bath oil is provided, comprising the following components in percentage by weight:

[0007] Surfactant 32%-45%, synthetic oil 10%-18%, glycerin 25%-30%, natural plant oil 0.35%-1.5%, non-ionic thickener 0.5%-4%, flavor 0.1%-3.5%, rose water 0.01%-1%, preservative 0.2%-1%, citric acid 0.1%-2%, the balance is deionized water;

[0008] The surfactant is a mixture of a nonionic surfactant and an amphoteric surfactant; the weight ratio of the nonionic surfactant to the amphoteric surfactant is 1:(1-3);

[0009] The synthetic oil is selected from one or more of PEG-7 glyceryl cocoate, tocopheryl acetate, and a mixture of cocoyl glucoside and glyceryl oleate;

[0010] The natural plant oil is selected from one or more of lavender oil, rice bran oil, sunflower seed oil, soybean oil and cedarwood oil.

[0011] Furthermore, the amphoteric surfactant is sodium cocoamphoacetate; and the nonionic surfactant is selected from one or more of cocamide methyl MEA, cocoyl glucoside and polysorbate 20.

[0012] Furthermore, the nonionic surfactant is composed of cocamide methyl MEA, cocoyl glucoside and polysorbate 20; the weight ratio of cocamide methyl MEA, cocoyl glucoside and polysorbate 20 is 1:(3-6):(2-5).

[0013] Preferably, the weight ratio of cocamide methyl MEA, coco-glucoside and polysorbate 20 is 1:4:3.

[0014] Furthermore, the weight ratio of the nonionic surfactant to the amphoteric surfactant is 1:2.

[0015] Furthermore, the weight ratio of the natural plant oil, synthetic oil and glycerin is 1:(8-28):(18-54).

[0016] Preferably, the weight ratio of the natural plant oil, synthetic oil and glycerin is 1:14.2:27.5.

[0017] Furthermore, the synthetic oil is composed of PEG-7 glyceryl cocoate, tocopheryl acetate, and a mixture of cocoyl glucoside and glyceryl oleate, and the weight ratio of the tocopheryl acetate, PEG-7 glyceryl cocoate, and the mixture of cocoyl glucoside and glyceryl oleate is 1:(45-70):(5-15).

[0018] Preferably, the weight ratio of the tocopheryl acetate, PEG-7 glyceryl cocoate, and the mixture of coco-glucoside and glyceryl oleate is 1:60:10.

[0019] Furthermore, the natural plant oil consists of lavender oil, rice bran oil, sunflower seed oil, soybean oil, and cedarwood oil.

[0020] Furthermore, the nonionic thickener is a mixture of PEG / PPG-120 / 10 trimethylolpropane trioleate and laureth-2.

[0021] Furthermore, the preservative is selected from one or more of sodium benzoate and phenoxyethanol.

[0022] In a second aspect, a method for preparing the moisturizing bath oil according to the first aspect is provided, characterized in that the method comprises the following steps:

[0023] S1. Prepare the components by weight percentage;

[0024] S2. The surfactant was added to deionized water and mixed at 15-35 ° C to obtain a phase A solution;

[0025] S3. Add synthetic oil, glycerin, natural plant oil, non-ionic thickener, fragrance, rose water and preservative to the phase A solution in sequence, mix and stir at 15-35°C until the solution becomes light yellow and transparent. Finally, add citric acid to adjust the pH value to 5.5-6.5 to obtain a moisturizing bath oil.

[0026] Among them, sodium cocoamphoacetate is an amphoteric surfactant with excellent stability. It can be well compatible with anionic, cationic and non-ionic surfactants. At the same time, it can reduce the irritation of anionic surfactants and has the advantages of thickening, stabilizing foam and being resistant to hard water.

[0027] Coco-glucoside is a glycoside surfactant synthesized from glucose and natural fatty alcohols. It boasts excellent foaming properties, safety, minimal irritation, and strong detergency. It is a new, comprehensive nonionic surfactant that effectively cleanses skin from external pollutants, restoring it to a clean state.

[0028] Polysorbate-20 is a fatty acid derivative that can be used as an emulsifier in cosmetics to improve the stability of cosmetics, increase the volume of fragrances, and improve product quality.

[0029] Cocamidomethyl MEA is a new natural non-ionic surfactant with excellent thickening, foaming and stabilizing properties. It does not contain diethanolamine and nitrosamines restricted by the EU.

[0030] PEG-7 Glyceryl Cocoate is a hydrophilic emollient oil ester with an HLB range of 10 to 11. It is soluble in transparent surfactant systems, replenishing oil to the surfactant system, has excellent fat-replenishing properties, can reduce the irritation of surfactants, and improve the skin feel after use. It can maintain the oil balance of the skin and hair, reduce dryness, and increase the lubrication of the skin and hair.

[0031] Glyceryl oleate can improve the mildness of the product to the skin, increase the skin's moisturizing effect, while improving the skin's roughness and making the skin smooth.

[0032] Tocopheryl acetate, a derivative of vitamin E, is commonly used as an antioxidant in cosmetics, demonstrating its excellent antioxidant properties. A natural, oil-soluble substance, it acts as a nourishing moisturizer for the skin. Added to skincare products, it prevents oil rancidity and oxidation, stabilizing it. It also excels in moisturizing, maintaining connective tissue, and protecting the skin from UV damage. It softens and retains moisture, promotes wound healing, prevents inflammation, and reduces rough, cracked skin, while also improving dark spots.

[0033] Glycerin is a chemical that generates heat when it comes into contact with water. It contains three hydroxyl groups, which effectively bind to water molecules, thus exhibiting hygroscopic moisturizing properties. When in contact with the skin, glycerin not only absorbs moisture from the outside air but also from the skin's surface, causing the water in the air to dissolve into the glycerin and dilute it, generating heat. Glycerin molecules can form hydrogen bonds with water molecules, forming a thin film on the skin that isolates the air and prevents evaporation of moisture from the skin, keeping the skin soft and moisturizing.

[0034] The characteristic of lavender oil is that it contains linalool, which can reach about 50%, and about 10% camphor. It has strong bactericidal function and can effectively treat various skin and mucous membrane infections.

[0035] Rice bran oil is a nutrient-rich vegetable oil, rich in unsaturated fatty acids, octacosanol, and functional substances such as gamma-oryzanol, phytosterols, tocotrienols, and squalene. It exhibits excellent antioxidant stability. Because its triglycerides are similar in structure to human sebum, it is gentler and more compatible with the skin. Even after washing, the oil remains on the skin, acting as a moisturizer.

[0036] Sunflower seed oil is rich in fatty acids such as linoleic acid, linolenic acid and oleic acid, which have the ability to soften the skin, lock in skin moisture, and enable the skin to maintain its important barrier function.

[0037] Soybean oil is rich in unsaturated fatty acids such as linoleic acid and linolenic acid. As an edible oil, it is highly safe and can moisturize the skin without causing allergic risks.

[0038] Cedarwood oil has excellent lipolytic effects, which can improve facial oiliness and regulate scalp oil secretion.

[0039] Non-ionic thickeners, including PEG / PPG-120 / 10 trimethylolpropane trioleate and Laureth-2, are highly compatible with various surfactants. They easily form a spatial network structure, helping to stabilize oils and pearlescent crystals, thereby improving system stability. They are also well-suited for mild formulas such as those for sensitive skin. They exhibit good skin compatibility and readily precipitate and deposit on the skin during the cleansing process, leaving it smooth and soft, while also making the foam more moisturizing and delicate.

[0040] Rose water, also known as rose hydrosol, is a saturated distilled solution separated during the extraction of rose essential oil. It has a light rose fragrance. Retaining the natural rose aroma, rose hydrosol can soothe and relax, elevating moods. It also has skincare benefits such as hydrating, moisturizing, and whitening.

[0041] Sodium benzoate is an acidic preservative. Its preservative principle is: it has high lipophilicity and can easily penetrate the cell membrane into the cell body, interfere with the permeability of the cell membrane, inhibit the cell membrane's absorption of amino acids, inhibit the activity of the cell respiratory enzyme system, prevent the condensation reaction of acetyl coenzyme, and inhibit the activity of microorganisms, thereby achieving the purpose of product preservation.

[0042] Phenoxyethanol has a slightly aromatic smell and is stable below 80°C. It mainly inhibits bacteria and has a weaker inhibition on fungi. It is stable and effective at a pH of 3 to 10. It can be used with anionic and cationic surfactants. Its antiseptic mechanism is to cause the loss of permeability of microbial membranes, resulting in the leakage of cell contents and the loss of energy generated by electronic power.

[0043] Citric acid, extracted from lemons, is a type of fruit acid. It's primarily used in cosmetics as a chelating agent, buffer, and pH regulator, and is essential for the body's circulation. It accelerates keratin turnover, helps exfoliate melanin, refine pores, and dissolve blackheads. It also moisturizes and whitens the skin, helping to improve dark spots and roughness.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The moisturizing and nourishing bath oil of the present invention utilizes a compound of an amphoteric surfactant and a nonionic surfactant to impart a mild cleansing power and foaming effect to the bath oil. A rational combination of synthetic oil, glycerin, and natural plant oil ensures a moisturizing and warming sensation during bathing. A nonionic thickener is also added to impart a certain viscosity to the bath oil, consistent with the texture of oil. Therefore, the bath oil of the present invention, through the combination of surfactant, synthetic oil, glycerin, natural plant oil, and nonionic thickener, can achieve the technical effect of moisturizing and nourishing. Furthermore, the combination of essence and rose water creates a synergistic effect, providing a soothing and relaxing effect during bathing and a long-lasting moisturizing and nourishing experience for the skin after bathing. Finally, the addition of preservatives and citric acid ensures the bath oil's weakly acidic system is stable and safe over the long term. DETAILED DESCRIPTION

[0046] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0047] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0048] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in the specification and appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0049] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0050] In order to more fully understand the technical content of the present invention, the technical solution of the present invention is further introduced and illustrated in conjunction with specific embodiments below.

[0051] The nonionic thickener of the present invention can be selected from TT, TT is derived from coconut oil and palm kernel oil.

[0052] The mixture of cocoyl glucoside and glycerol oleate in the present invention can be selected from PO65, PO65 is derived from coconut and sunflower oils and is 100% natural.

[0053] Preparation method of moisturizing bath oil

[0054] S1. Prepare the components by weight percentage;

[0055] S2. The surfactant was added to deionized water and mixed at 15-35 ° C to obtain a phase A solution;

[0056] S3. Add synthetic oil, glycerin, natural plant oil, non-ionic thickener, fragrance, rose water and preservative to the phase A solution in sequence, mix and stir at 15-35°C until the solution becomes light yellow and transparent. Finally, add citric acid to adjust the pH value to 5.5-6.5 to obtain a moisturizing bath oil.

[0057] Bath oil effectiveness test - foam performance test

[0058] S1. Select subjects who have passed the screening, mark the fixed position on the inner side of their left forearm with a marker, gently wipe the forearm with clean water, and sit quietly in a standard environment (temperature 20°C-22°C, humidity 40%-60%) for 15 minutes.

[0059] S2. Wash the marked area on the subject's left forearm with 1g of bath oil, maintaining the same operation and washing time. Observe and record the foaming speed and foam texture of the bath oil, as well as the warming sensation felt on the arm during washing.

[0060] Bath Oil Effectiveness Test - Mildness Test

[0061] This test utilizes the intact, clear, and transparent vascular system of the chorioallantoic membrane of mid-stage incubated chicken embryos. A certain amount of the test substance is placed in direct contact with the chorioallantoic membrane. After a period of exposure, changes in chorioallantoic membrane toxicity indicators (such as bleeding, coagulation, and vascular melting) are observed. These indicators reflect changes in the morphology, structure, color, and permeability of the blood vessels and vascular network, as well as phenomena such as chorioallantoic membrane protein denaturation and the degree of damage. Finally, a score is generated based on these indicators to assess the eye irritation potential of the test substance. Experimental steps:

[0062] S1. Preparation of test substances

[0063] S1.1. Liquid test substance

[0064] The liquid test substance of this invention is bath oil. It should be tested in its undiluted form using the reaction time method. Opaque liquid test substances (turbid and colored suspensions) should be tested using the endpoint evaluation method. Opaque, turbid liquid test substances can be dissolved / diluted with an appropriate solvent to a transparent solution of the highest concentration and tested using the reaction time method. This experiment uses the endpoint evaluation method.

[0065] S1.2. Controls and Preparation

[0066] Negative control: 0.9% sodium chloride solution is usually selected for flushing and negative control during the experiment.

[0067] Positive control: A known eye irritant should be included in each test. If the test is intended to identify corrosive or severely irritating substances, the positive control should be a substance capable of producing a severe reaction, such as 1% SDS or 0.1 mol / L sodium hydroxide. If the purpose is to assess the severity of the test substance's eye irritation, a positive control with a moderately drastic reaction, such as varying concentrations of acetic acid, can be used.

[0068] Solvent control: If the test substance is diluted with a certain solvent, the test should set up a solvent control.

[0069] Benchmark controls are primarily used to demonstrate the validity of test methods, particularly to examine the reactivity of each batch of chicken embryos, detect test substances that are turbid, have unusual classifications, or exhibit unusual eye irritation, or to evaluate the relative irritation potential of an eye irritant. Benchmark controls should possess the following characteristics: a stable and reliable source, a structure and function similar to the chemical classification of the test substance, known physical and chemical properties, known in vivo rabbit eye effects, and a known magnitude of the expected reaction.

[0070] S2.CAM Preparation

[0071] Candle 9-day-old embryos and discard unfertilized, inactive, defective, or thinly shelled embryos. First, mark the location of the air cell with a pen. Use a mini-cutter to open the shell and peel away the remaining shell along the opening, taking care not to damage the egg membrane. Moisten the egg membrane with a pipette and carefully remove the inner membrane with forceps, ensuring that the vascular membrane is intact. The vascular system should be re-inspected at this point. If intact, the next step can be performed.

[0072] S3. Detection

[0073] Apply 0.3 mL of the extruded test substance directly to the CAM, ensuring that at least 50% of the CAM surface is covered by the test substance. After 3 minutes of exposure, gently rinse the test substance from the CAM membrane with saline. Observe the results within 30 seconds of rinsing to determine the severity of each toxic effect. If observations indicate that at least one response in all six chick embryos is rated as moderate or above, the test should be repeated.

[0074] S4. Results and Observations

[0075] S4.1. Bleeding

[0076] Bleeding refers to the outflow of blood from the blood vessels and / or capillaries of the CAM. Bleeding can manifest in various forms, such as cauliflower-like, smooth, diffuse gauze-like or punctate bleeding (due to the selective outflow of blood from different areas of the vascular membrane); bleeding is graded and scored according to its severity.

[0077] a) No bleeding (0 points);

[0078] b) Mild bleeding (1 point): only small blood vessel bleeding and a small amount of bleeding (e.g., 0.5% Texapon ASV, 5 min);

[0079] c) Moderate bleeding (2 points): bleeding from small and large blood vessels with significant blood outflow (e.g., 1.0% Texapon ASV, 5 min);

[0080] d) Severe bleeding (3 points): Almost all blood vessels bleed, with massive blood outflow (e.g., 5% Texapon ASV, 5 minutes). It should be noted that bleeding may be transient, and the massive bleeding observed in the first 30 seconds may overwhelm the subsequent bleeding reaction.

[0081] S4.2. Coagulation

[0082] Refers to the denaturation of proteins inside and outside blood vessels, usually only seen in large and medium-sized blood vessels, and does not include changes in capillaries. Thrombosis: It is intravascular coagulation, which is the interruption of blood flow in blood vessels caused by various reasons, such as changes in blood vessel pressure, swelling of the tube wall, etc., which manifests as dark coagulation spots inside the blood vessels. Extravascular coagulation: It can manifest as dark coagulation spots outside the blood vessels; it can also manifest as turbidity (opaque), appearing in all or part of the membrane, which may be similar to milky white gauze, or milky. Careful inspection is required not to confuse coagulation with changes in the physical and chemical properties of the test substance in aqueous solution (such as the formation of colloids, precipitation, etc.). Coagulation is graded and scored according to the severity.

[0083] a) No coagulation (0 points);

[0084] b) Mild coagulation (1 point): Mild intravascular and / or extravascular coagulation, and / or mild turbidity of the CAM membrane (mild coagulation such as 0.2% sodium hydroxide for 5 minutes, mild turbidity such as 0.3% acetic acid for 5 minutes);

[0085] c) Moderate coagulation (2 points): moderate intravascular and / or extravascular coagulation, and / or moderate turbidity of the CAM membrane (moderate coagulation such as 0.3% sodium hydroxide for 5 minutes, moderate turbidity such as 3% acetic acid for 5 minutes);

[0086] d) Severe coagulation (3 points): severe intravascular and / or extravascular coagulation, and / or severe turbidity of the CAM membrane (severe coagulation such as 0.5% sodium hydroxide for 5 minutes, severe turbidity such as 30% acetic acid for 5 minutes).

[0087] S4.3. Vascular dissolution

[0088] This refers to the disappearance of blood vessels on the CAM membrane, which may be caused by multiple factors such as bleeding and changes in vascular wall tension. Hemolysis is graded and scored according to its severity.

[0089] a) No vascular lysis (0 points);

[0090] b) Mild vascular lysis (1 point): only small blood vessels are thawed (e.g., 0.5% Texapon ASV, 5 min);

[0091] c) Moderate vascular lysis (2 points): lysis of small and large blood vessels (e.g., 1% Texapon ASV, 5 min);

[0092] d) Severe vascular ablation (3 points): Large vessels and the entire vascular tree are ablated (e.g., 5% Texapon ASV, 5 min).

[0093] S5. Endpoint Scoring (ES)

[0094] For tests conducted using the endpoint evaluation method, the endpoint score (ES) should be calculated and the result should be rounded to two decimal places: ES = the sum of the degrees of bleeding, coagulation, and vascular lysis observed in 6 chicken embryos. The eye irritation of the test substance is classified according to the ES value. Endpoint score irritation classification:

[0095] a) ES ≤ 12 no / mild irritation;

[0096] b) 12<ES<16 moderate irritation;

[0097] c) ES ≥ 16: Strong irritant / corrosive.

[0098] Bath Oil Effect Test - Moisturizing Performance Test

[0099] Moisturizing performance test method:

[0100] S1. Select subjects who have passed the screening test, mark a fixed location on the inside of their left forearm with a marker, and gently wipe the forearm with clean water. After sitting quietly for 15 minutes in a standard environment (temperature 20°C-22°C, humidity 40%-60%), use a skin tester to measure the moisture value L1 at the marked location and record it.

[0101] S2. The marked area on the subject's left forearm was cleaned with 300 μL of shower oil, with the same operation and cleaning time. After cleaning, the area was allowed to dry naturally and the subject sat still for 30 minutes. When the moisture value L2 of the marked area was measured again at the specified point, the skin tester was used to test the moisture value again and record it.

[0102] S3. Compare the moisture content of S1 and S2 to obtain the moisture content growth rate; moisture content growth rate = (L2-L1) / L1.

[0103] Bath Oil Effectiveness Test - Water Loss Test

[0104] Transcutaneous water loss (TEWL) is an important parameter for evaluating the function of the skin's water barrier and can be used to assess the strength of the skin's barrier function. If the skin barrier function is impaired, TEWL will increase, and symptoms such as dryness, flaking, and sensitivity will appear. The better the skin's protective layer, the higher the moisture content, and the lower the TEWL value. The unit of TEWL is: g / hm 2 . Water loss test method:

[0105] S1. Select participants who have passed the screening test. Mark a fixed location on the inside of their left forearm with a marker and gently wipe the forearm with clean water. After sitting quietly for 15 minutes in a standard environment (temperature 20°C-22°C, humidity 40%-60%), measure the skin water loss (W1) using a skin water loss probe and record the amount.

[0106] S2. The subject's left forearm marked area was cleaned with 300 μL of shower oil daily, with the same operation and cleaning time, for seven consecutive days. After cleaning on the seventh day, the area was allowed to dry naturally and sit quietly for 30 minutes. The skin moisture loss W2 was measured using a skin moisture loss test probe and recorded.

[0107] During the test, the subjects were not allowed to apply any other cosmetics on the test area.

[0108] Example 1

[0109] A moisturizing bath oil, comprising the following components in percentage by weight:

[0110] Surfactants 36% (24% Sodium Cocoamphoacetate, 1.5% Cocamidomethyl MEA, 6% Coco-Glucoside and 4.5% Polysorbate 20),

[0111] Synthetic oil 14.2% (12% PEG-7 Glyceryl Cocoate, 0.2% Tocopheryl Acetate, 2% Coco-Glucoside and Glyceryl Oleate mixture),

[0112] Glycerol 27.5%,

[0113] Natural plant oils 1% (0.1% lavender oil, 0.25% rice bran oil, 0.25% sunflower seed oil, 0.25% soybean oil, 0.15% cedarwood oil),

[0114] Nonionic thickener 1.5% (a mixture of PEG / PPG-120 / 10 trimethylolpropane trioleate and laureth-2),

[0115] Fragrance 3%,

[0116] Rose water 1%,

[0117] Preservatives 0.8% (0.3% sodium benzoate and 0.5% phenoxyethanol),

[0118] Citric acid 0.85%,

[0119] The balance is deionized water;

[0120] The moisturizing bath oil of Example 1 was prepared according to the above weight percentage components and the following steps:

[0121] S1. Prepare the components by weight percentage;

[0122] S2. The surfactant was added to deionized water and mixed and stirred at 25 ° C to obtain a phase A solution;

[0123] S3. Add synthetic oil, glycerin, natural plant oil, non-ionic thickener, fragrance, rose water and preservative to the phase A solution in sequence, mix and stir at 25°C until the solution becomes light yellow and transparent, and finally add citric acid to adjust the pH to 6 to obtain a moisturizing bath oil.

[0124] 1. The effect of different weights of surfactants on the effect of bath oil

[0125] Example 2: Example 2 is compared with Example 1, except that the weight percentage of surfactant in the bath oil is 43.5% (27% sodium cocoamphoacetate, 2% cocamide methyl MEA, 9.5% cocoyl glucoside and 5% polysorbate 20), and other conditions are the same.

[0126] Comparative Example 1: Compared with Example 1, the difference between Comparative Example 1 is that the bath oil does not contain a surfactant, and the other conditions are the same.

[0127] Comparative Example 2: Comparative Example 2 is compared with Example 1, except that the weight percentage of the surfactant in the bath oil is 8% (1% sodium cocoamphoacetate, 1% cocamide methyl MEA, 1% cocoyl glucoside and 5% polysorbate 20), and the other conditions are the same.

[0128] Comparative Example 3: Comparative Example 3 is compared with Example 1, except that the weight percentage of the surfactant in the bath oil is 50% (30% sodium cocoamphoacetate, 2% cocamide methyl MEA, 10% cocoyl glucoside and 8% polysorbate 20), and the other conditions are the same.

[0129] Comparative Example 4: Comparative Example 4 is compared with Example 1, except that the weight percentage of the surfactant in the bath oil is 25% of the surfactant (15% sodium cocoamphoacetate, 1% cocamide methyl MEA, 4% cocoyl glucoside and 5% polysorbate 20), and the other conditions are the same.

[0130] The mildness test was performed on Examples 1-2 and Comparative Examples 1-4, and the foaming performance of the bath oils during use was observed. The test results are shown in Tables 1 and 2 below:

[0131] Table 1 Test results of mildness of moisturizing bath oils of Examples 1-2 and Comparative Examples 1-4

[0132]

[0133] From the test results in Table 1, it can be seen that no surfactant is added to the moisturizing bath oil (Comparative Example 1), a small amount of surfactant is added (Comparative Example 2 and Comparative Example 4), or a large amount of surfactant is added (Comparative Example 3), which has a great impact on the mildness of the bath oil and has moderate irritation. Therefore, the weight percentage of the surfactant in the moisturizing bath oil is preferably 32% to 45%.

[0134] Table 2 Test results of foam performance of moisturizing bath oils of Examples 1-2 and Comparative Examples 1-4

[0135]

[0136] As can be seen from the test results in Table 2, no surfactant is added to the moisturizing bath oil (Comparative Example 1), a small amount of surfactant is added (Comparative Example 2 and Comparative Example 4), or a large amount of surfactant is added (Comparative Example 3) has a great impact on the foaming performance of the bath oil. Therefore, the weight percentage of the surfactant in the moisturizing bath oil is preferably 32% to 45%.

[0137] 2. Effect of different weight ratios of amphoteric surfactants and nonionic surfactants on the effect of bath oil

[0138] Example 3: Compared with Example 1, Example 3 differs in that the weight percentage of the nonionic surfactant in the bath oil is 18%, and the weight percentage of the amphoteric surfactant is 18%, that is, the weight ratio of the nonionic surfactant to the amphoteric surfactant is 1:1, and the other conditions are the same.

[0139] Example 4: Compared with Example 1, Example 4 differs in that the weight percentage of the nonionic surfactant in the bath oil is 9%, and the weight percentage of the amphoteric surfactant is 27%, that is, the weight ratio of the nonionic surfactant to the amphoteric surfactant is 1:3, and the other conditions are the same.

[0140] Comparative Example 5: Compared with Example 1, the difference in Comparative Example 5 is that the bath oil does not contain an amphoteric surfactant, and the other conditions are the same.

[0141] Comparative Example 6: Compared with Example 1, the difference in Comparative Example 6 is that the bath oil does not contain a nonionic surfactant, and the other conditions are the same.

[0142] Comparative Example 7: Compared with Example 1, the difference in Comparative Example 7 is that the weight percentage of the nonionic surfactant in the bath oil is 24%, and the weight percentage of the amphoteric surfactant is 12%, that is, the weight ratio of the nonionic surfactant to the amphoteric surfactant is 1:0.5, and the other conditions are the same.

[0143] Comparative Example 8: Compared with Example 1, the difference in Comparative Example 8 is that the weight percentage of the nonionic surfactant in the bath oil is 7.2%, and the weight percentage of the amphoteric surfactant is 28.8%, that is, the weight ratio of the nonionic surfactant to the amphoteric surfactant is 1:4, and the other conditions are the same.

[0144] The mildness test was conducted on Example 1, Examples 3-4, and Comparative Examples 5-8, and the foaming performance of the bath oils during use was observed. The test results are shown in Tables 3 and 4 below:

[0145] Table 3 Test results of mildness of moisturizing bath oils of Example 1, Examples 3-4 and Comparative Examples 5-8

[0146]

[0147]

[0148] From the test results in Table 3, it can be seen that no amphoteric surfactant is added to the moisturizing bath oil (Comparative Example 5), no nonionic surfactant is added (Comparative Example 6), a small amount of amphoteric surfactant is added (Comparative Example 7), a large amount of amphoteric surfactant is added, or the amount of nonionic surfactant added is not enough to increase the volume of the essence (Comparative Example 8), which has a great impact on the mild performance of the bath oil and has moderate irritation. Therefore, the weight ratio of nonionic surfactant to amphoteric surfactant in the moisturizing bath oil is preferably 1: (1-3).

[0149] Table 4 Test results of foam performance of moisturizing bath oils of Example 1, Examples 3-4 and Comparative Examples 5-8

[0150]

[0151] From the test results in Table 4, it can be seen that no amphoteric surfactant is added to the moisturizing bath oil (Comparative Example 5), no nonionic surfactant is added (Comparative Example 6), the amount of amphoteric surfactant added is small (Comparative Example 7), the amount of amphoteric surfactant added is large, or the amount of nonionic surfactant added is not enough to increase the volume of the essence (Comparative Example 8), which has a great influence on the foam performance of the bath oil. Therefore, the weight ratio of the nonionic surfactant to the amphoteric surfactant in the moisturizing bath oil is preferably 1: (1-3).

[0152] 3. Effect of different weight ratios of non-ionic surfactant components on the effect of bath oil

[0153] Example 5: Example 5 is different from Example 1 in that the weight percentage of the nonionic surfactant in the bath oil is 12% (2% cocamide methyl MEA, 6% cocoyl glucoside and 4% polysorbate 20), wherein the weight ratio of cocamide methyl MEA, cocoyl glucoside and polysorbate 20 is 1:3:2, and the other conditions are the same.

[0154] Example 6: Example 6 is different from Example 1 in that the weight percentage of the nonionic surfactant in the bath oil is 12% (1% cocamide methyl MEA, 6% cocoyl glucoside and 5% polysorbate 20), wherein the weight ratio of cocamide methyl MEA, cocoyl glucoside and polysorbate 20 is 1:6:5, and the other conditions are the same.

[0155] Comparative Example 9: Comparative Example 9 is compared with Example 1, except that the weight percentage of the nonionic surfactant in the bath oil is 12% (6% cocoyl glucoside and 6% polysorbate 20), and cocamide methyl MEA is not included. Other conditions are the same.

[0156] Comparative Example 10: Comparative Example 10 is compared with Example 1, except that the weight percentage of the nonionic surfactant in the bath oil is 12% (2% cocamide methyl MEA and 10% cocoyl glucoside), and polysorbate 20 is not included. Other conditions are the same.

[0157] Comparative Example 11: Comparative Example 11 is compared with Example 1, except that the weight percentage of the non-ionic surfactant in the bath oil is 12% (2% cocamide methyl MEA, 8% cocoyl glucoside and 2% polysorbate 20), wherein the weight ratio of cocamide methyl MEA, cocoyl glucoside and polysorbate 20 is 1:4:1, and the other conditions are the same.

[0158] Comparative Example 12: Comparative Example 12 is compared with Example 1, except that the weight percentage of the nonionic surfactant in the bath oil is 12% (2% cocamide methyl MEA and 10% polysorbate 20), and cocoyl glucoside is not included. Other conditions are the same.

[0159] The mildness test was conducted on Example 1, Examples 5-6, and Comparative Examples 9-12, and the foaming performance of the bath oils during use was observed. The test results are shown in Tables 5 and 6 below:

[0160] Table 5 Test results of mildness of moisturizing bath oils of Example 1, Examples 5-6 and Comparative Examples 9-12

[0161]

[0162]

[0163] From the test results in Table 5, it can be seen that no cocoyl glucoside is added to the moisturizing and nourishing bath oil (Comparative Example 12), no polysorbate-20 is added (Comparative Example 10), and the amount of polysorbate-20 added is not enough to increase the volume of the essence (Comparative Example 11), which has a great impact on the mild performance of the bath oil and has moderate irritation. Therefore, the weight ratio of cocamidomethyl MEA, cocoyl glucoside and polysorbate-20 in the non-ionic surfactant in the bath oil is preferably 1: (3-6): (2-5).

[0164] Table 6 Test results of foam performance of moisturizing bath oils of Example 1, Examples 5-6 and Comparative Examples 9-12

[0165]

[0166]

[0167] From the test results in Table 6, it can be seen that no cocoyl glucoside is added to the bath oil (Comparative Example 12), no polysorbate-20 is added (Comparative Example 10), no cocamidomethyl MEA is added (Comparative Example 9), and the amount of polysorbate-20 added is not enough to increase the volume of the essence (Comparative Example 11), which has a great influence on the foaming performance of the bath oil. Therefore, the weight ratio of cocamidomethyl MEA, cocoyl glucoside and polysorbate-20 in the non-ionic surfactant in the bath oil is preferably 1: (3-6): (2-5).

[0168] 4. Effects of different weight ratios of natural plant oils, synthetic oils, and glycerin on the effects of bath oils

[0169] Example 7: Compared with Example 1, Example 7 differs in that the weight percentage of natural plant oil in the bath oil is 1.525%, the weight percentage of synthetic oil is 12.2%, and the weight percentage of glycerol is 28.975%, that is, the weight ratio of natural plant oil, synthetic oil and glycerol is 1:8:19, and other conditions are the same.

[0170] Example 8: Compared with Example 1, Example 8 differs in that the weight percentage of natural plant oil in the bath oil is 1.22%, the weight percentage of synthetic oil is 19.52%, and the weight percentage of glycerol is 21.96%, that is, the weight ratio of natural plant oil, synthetic oil and glycerol is 1:16:18, and other conditions are the same.

[0171] Comparative Example 13: Compared with Example 1, Comparative Example 13 differs in that it does not contain natural plant oil, and other conditions are the same.

[0172] Comparative Example 14: Compared with Example 1, Comparative Example 14 differs in that the weight percentage of natural plant oil in the bath oil is 0.2%, the weight percentage of synthetic oil is 10%, and the weight percentage of glycerol is 25%, that is, the weight ratio of natural plant oil, synthetic oil and glycerol is 1:50:125, and the other conditions are the same.

[0173] Comparative Example 15: Compared with Example 1, Comparative Example 15 differs in that the weight percentage of natural plant oil in the bath oil is 2%, the weight percentage of synthetic oil is 10%, and the weight percentage of glycerol is 25%, that is, the weight ratio of natural plant oil, synthetic oil and glycerol is 1:5:12.5, and the other conditions are the same.

[0174] Comparative Example 16: Compared with Example 1, Comparative Example 16 differs in that glycerol is not contained, and other conditions are the same.

[0175] Comparative Example 17: Compared with Example 1, the difference in Comparative Example 17 is that the weight percentage of natural plant oil in the bath oil is 1.5%, the weight percentage of synthetic oil is 12%, and the weight percentage of glycerol is 22.5%, that is, the weight ratio of natural plant oil, synthetic oil and glycerol is 1:8:15, and the other conditions are the same.

[0176] Comparative Example 18: Compared with Example 1, Comparative Example 18 differs in that the weight percentage of natural plant oil in the bath oil is 0.4%, the weight percentage of synthetic oil is 10%, and the weight percentage of glycerol is 32%, that is, the weight ratio of natural plant oil, synthetic oil and glycerol is 1:25:80, and the other conditions are the same.

[0177] Comparative Example 19: Compared with Example 1, Comparative Example 19 differs in that it does not contain synthetic oil, and other conditions are the same.

[0178] Comparative Example 20: Compared with Example 1, Comparative Example 20 differs in that the weight percentage of natural plant oil in the bath oil is 1%, the weight percentage of synthetic oil is 5%, and the weight percentage of glycerol is 25%, that is, the weight ratio of natural plant oil, synthetic oil and glycerol is 1:5:25, and the other conditions are the same.

[0179] Comparative Example 21: Compared with Example 1, the difference in Comparative Example 21 is that the weight percentage of natural plant oil in the bath oil is 0.8%, the weight percentage of synthetic oil is 24%, and the weight percentage of glycerol is 28%, that is, the weight ratio of natural plant oil, synthetic oil and glycerol is 1:30:35, and the other conditions are the same.

[0180] Comparative Example 22: Compared with Example 1, Comparative Example 22 differs in that it does not contain natural plant oils and synthetic oils, and other conditions are the same.

[0181] Comparative Example 23: Compared with Example 1, Comparative Example 23 differs in that it does not contain natural plant oils and glycerin, and other conditions are the same.

[0182] The moisturizing performance test and the water loss test were performed on Example 1, Examples 7-8, and Comparative Examples 13-23, respectively. The foaming performance of the bath oil and the heating sensation during use were observed. The test results are shown in Tables 7 and 8 below:

[0183] Table 7 Moisturizing performance test and water loss test results of Example 1, Examples 7-8 and Comparative Examples 13-23 Moisturizing Bath Oil

[0184]

[0185]

[0186] As shown in the test results in Table 7, moisturizing bath oils without synthetic oils (Comparative Example 19), glycerin (Comparative Example 16), natural plant oils (Comparative Example 13), containing neither natural plant oils nor synthetic oils (Comparative Example 22), containing neither natural plant oils nor glycerin (Comparative Example 23), containing a low amount of natural plant oils (Comparative Example 14), high synthetic oil content (Comparative Example 21), low synthetic oil content (Comparative Example 20), and high glycerin content (Comparative Example 18) exhibited low moisture content growth rates and high skin water loss. The simultaneous absence of synthetic oils and natural plant oils, or glycerin and natural plant oils, had a greater impact on the moisturizing properties and water loss of the bath oils than the absence of either single ingredient. Further increasing the amount of natural plant oils (Comparative Example 15) had little effect on the moisture content growth rate and skin water loss. Therefore, the weight ratio of natural plant oils, synthetic oils, and glycerin in moisturizing bath oils is 1:(8-28):(18-54).

[0187] Table 8 Test results of foam performance and heating sensation during washing of moisturizing bath oils of Example 1, Examples 7-8 and Comparative Examples 13-23

[0188]

[0189]

[0190]

[0191] The test results in Table 8 show that moisturizing bath oils with a high content of natural plant oils (Comparative Example 15), no synthetic oils (Comparative Example 19), a high content of synthetic oils (Comparative Example 21), a low content of synthetic oils (Comparative Example 20), and a high glycerin content (Comparative Example 18) significantly affect the foaming properties of the bath oil. The absence of glycerin (Comparative Examples 16 and 23) significantly affects the warming sensation during bathing. Therefore, the weight ratio of natural plant oils, synthetic oils, and glycerin in moisturizing bath oils is 1:(8-28):(18-54).

[0192] 5. Effect of weight ratio of synthetic oil components on the effect of bath oil

[0193] Example 9: Example 9 is different from Example 1 in that the weight percentage content of synthetic oil in the bath oil is 14.2% (12.5% ​​PEG-7 glyceryl cocoate, 0.2% tocopheryl acetate, 1.5% mixture of cocoyl glucoside and glyceryl oleate), that is, the weight ratio of tocopheryl acetate, PEG-7 glyceryl cocoate and the mixture of cocoyl glucoside and glyceryl oleate is 1:62.5:7.5, and other conditions are the same.

[0194] Example 10: Example 10 is different from Example 1 in that the weight percentage content of synthetic oil in the bath oil is 14.2% (11.1% PEG-7 glyceryl cocoate, 0.2% tocopheryl acetate, 2.9% mixture of cocoyl glucoside and glyceryl oleate), that is, the weight ratio of tocopheryl acetate, PEG-7 glyceryl cocoate and the mixture of cocoyl glucoside and glyceryl oleate is 1:55.5:14.5, and other conditions are the same.

[0195] Comparative Example 24: Compared with Example 1, the difference in Comparative Example 24 is that the synthetic oil lacks PEG-7 glyceryl cocoate, and the other conditions are the same.

[0196] Comparative Example 25: Compared with Example 1, Comparative Example 25 differs in that the synthetic oil lacks the mixture of coconut glucoside and glycerol oleate, and the other conditions are the same.

[0197] Comparative Example 26: Compared with Example 1, the difference in Comparative Example 26 is that tocopherol acetate is missing in the synthetic oil, and the other conditions are the same.

[0198] Comparative Example 27: Comparative Example 27 is different from Example 1 in that the weight percentage of synthetic oil is 14.2% (12% PEG-7 glyceryl cocoate, 0.1% tocopheryl acetate, 2.1% mixture of cocoyl glucoside and glyceryl oleate), that is, the weight ratio of tocopheryl acetate, PEG-7 glyceryl cocoate and the mixture of cocoyl glucoside and glyceryl oleate is 1:120:21, and the other conditions are the same.

[0199] Comparative Example 28: Comparative Example 28 is compared with Example 1, except that the weight percentage of synthetic oil is 14.2% (12% PEG-7 glyceryl cocoate, 1% tocopheryl acetate, 1.2% mixture of cocoyl glucoside and glyceryl oleate), that is, the weight ratio of tocopheryl acetate, PEG-7 glyceryl cocoate and the mixture of cocoyl glucoside and glyceryl oleate is 1:12:1.2, and the other conditions are the same.

[0200] Comparative Example 29: Compared with Example 1, Comparative Example 29 differs in that the weight percentage of synthetic oil is 14.2% (7% PEG-7 glyceryl cocoate, 0.5% tocopheryl acetate, 6.7% mixture of cocoyl glucoside and glyceryl oleate), that is, the weight ratio of tocopheryl acetate, PEG-7 glyceryl cocoate and the mixture of cocoyl glucoside and glyceryl oleate is 1:14:13.4, and the other conditions are the same.

[0201] Comparative Example 30: Compared with Example 1, Comparative Example 30 differs in that the weight percentage of synthetic oil is 14.2% (13.6% PEG-7 glyceryl cocoate, 0.1% tocopheryl acetate, 0.5% mixture of cocoyl glucoside and glyceryl oleate), that is, the weight ratio of tocopheryl acetate, PEG-7 glyceryl cocoate and the mixture of cocoyl glucoside and glyceryl oleate is 1:136:5, and the other conditions are the same.

[0202] Comparative Example 31: Compared with Example 1, the difference between Comparative Example 31 is that the weight percentage of synthetic oil is 14.2% (13.1% PEG-7 glyceryl cocoate, 0.2% tocopheryl acetate, 0.9% mixture of coconut glucoside and glyceryl oleate), that is, the weight ratio of tocopheryl acetate, PEG-7 glyceryl cocoate and the mixture of coconut glucoside and glyceryl oleate is 1:65.5:4.5, and the other conditions are the same.

[0203] Comparative Example 32: Compared with Example 1, Comparative Example 32 differs in that the weight percentage of synthetic oil is 14.2% (10% PEG-7 glyceryl cocoate, 0.2% tocopheryl acetate, 4% mixture of cocoyl glucoside and glyceryl oleate), that is, the weight ratio of tocopheryl acetate, PEG-7 glyceryl cocoate and the mixture of cocoyl glucoside and glyceryl oleate is 1:50:20, and the other conditions are the same.

[0204] The moisturizing bath oils of Example 1, Examples 9-10, and Comparative Examples 24-32 were subjected to a moisturizing performance test and a water loss test, and the foaming performance of the bath oils during use was observed. The test results are shown in Tables 9 and 10 below:

[0205] Table 9 Moisturizing performance test and water loss test results of Example 1, Examples 9-10 and Comparative Examples 24-32 Moisturizing Bath Oil

[0206]

[0207]

[0208] As shown in the test results in Table 9, the moisturizing bath oils of Examples 1, 9, and 10 of the present invention have a high moisture content growth rate and a low skin moisture loss rate. However, the addition of no PEG-7 glyceryl cocoate (Comparative Example 24), a low PEG-7 glyceryl cocoate content (Comparative Example 29), a high PEG-7 glyceryl cocoate content (Comparative Example 30), the absence of a mixture of cocoyl glucoside and glyceryl oleate (Comparative Example 25), and the absence of tocopheryl acetate (Comparative Example 26) to the synthetic grease of the moisturizing bath oil significantly impacted the moisture content growth rate of the moisturizing bath oil. Further increasing the amount of the mixture of cocoyl glucoside and glyceryl oleate (Comparative Example 32) and tocopheryl acetate (Comparative Example 28) had little effect on the moisture content growth rate and skin moisture loss rate. Therefore, the weight ratio of tocopheryl acetate, PEG-7 glyceryl cocoate, and the mixture of cocoyl glucoside and glyceryl oleate in the synthetic grease of the bath oil is 1:(45-70):(5-15).

[0209] Table 10 Test results of foam performance of moisturizing bath oils of Example 1, Examples 9-10 and Comparative Examples 24-32

[0210]

[0211]

[0212] As shown in the test results of Table 10, the moisturizing bath oils of Examples 1, 9, and 10 of the present invention foam quickly, have a large amount of foam, and have fine and smooth foam. However, the synthetic greases of the moisturizing bath oils do not contain PEG-7 glyceryl cocoate (Comparative Example 24), or contain a low content of PEG-7 glyceryl cocoate (Comparative Example 29), do not contain a mixture of cocoyl glucoside and glyceryl oleate (Comparative Example 25), or contain a low content of a mixture of cocoyl glucoside and glyceryl oleate (Comparative Example 31), or contain a high content of a mixture of cocoyl glucoside and glyceryl oleate (Comparative Example 32), and have a high content of tocopheryl acetate (Comparative Example 28), which have a significant impact on the foaming performance of the bath oil. Therefore, the weight ratio of tocopheryl acetate, PEG-7 glyceryl cocoate, and the mixture of cocoyl glucoside and glyceryl oleate in the synthetic grease of the bath oil is 1:(45-70):(5-15).

[0213] 6. The impact of natural plant oil components on the effects of bath oils

[0214] Example 11: Example 11 is different from Example 1 in that the weight percentage content of natural plant oils in the bath oil is 1% (0.1% lavender oil, 0.3% rice bran oil, 0.2% sunflower seed oil, 0.3% soybean oil, 0.1% cedar wood oil), and other conditions are the same.

[0215] Example 12: Example 12 is different from Example 1 in that the weight percentage content of natural plant oils in the bath oil is 1% (0.1% lavender oil, 0.2% rice bran oil, 0.3% sunflower seed oil, 0.3% soybean oil, 0.1% cedar wood oil), and other conditions are the same.

[0216] Comparative Example 33: Compared with Example 1, the difference in Comparative Example 33 is that the natural plant oil does not contain lavender oil and cedar wood oil, and the other conditions are the same.

[0217] Comparative Example 34: Comparative Example 34 is different from Example 1 in that the natural plant oil does not contain cedar wood oil, and the other conditions are the same.

[0218] Comparative Example 35: Comparative Example 35 is compared with Example 1, except that the natural vegetable oil does not contain rice bran oil, and the other conditions are the same.

[0219] Comparative Example 36: Compared with Example 1, the difference in Comparative Example 36 is that the natural vegetable oil does not contain sunflower seed oil, and the other conditions are the same.

[0220] Comparative Example 37: Compared with Example 1, the difference between Comparative Example 37 is that the natural vegetable oil does not contain soybean oil, and the other conditions are the same.

[0221] Comparative Example 38: Compared with Example 1, the difference in Comparative Example 38 is that the natural plant oil does not contain rice bran oil and sunflower seed oil, and the other conditions are the same.

[0222] Comparative Example 39: Compared with Example 1, the difference in Comparative Example 39 is that the natural vegetable oil does not contain sunflower seed oil and soybean oil, and the other conditions are the same.

[0223] Comparative Example 40: Compared with Example 1, the difference in Comparative Example 40 is that the natural vegetable oil does not contain rice bran oil and soybean oil, and the other conditions are the same.

[0224] The moisturizing bath oils of Example 1, Examples 11-12, and Comparative Examples 33-40 were subjected to a moisturizing performance test and a water loss test. The test results are shown in Table 11 below:

[0225] Table 11 Moisturizing performance test and water loss test results of Example 1, Examples 11-12 and Comparative Examples 33-40 Moisturizing Bath Oil

[0226]

[0227]

[0228] As shown in Table 11, the moisture content growth rate of the moisturizing and nourishing bath oils without adding lavender oil and cedar oil (Comparative Example 33), cedar oil (Comparative Example 34), rice bran oil (Comparative Example 35), sunflower seed oil (Comparative Example 36), soybean oil (Comparative Example 37), rice bran oil and sunflower seed oil (Comparative Example 38), sunflower seed oil and soybean oil (Comparative Example 39), and rice bran oil and soybean oil (Comparative Example 40) is low, and the amount of skin water loss is large. Among them, the lack of two natural plant oils has a greater impact on the moisturizing performance and water loss of bath oil than the lack of a single component. In addition, the lack of rice bran oil and sunflower seed oil has a greater impact on bath oil.

[0229] 7. The influence of non-ionic thickener content on the effect of bath oil

[0230] Example 13: Example 13 is different from Example 1 in that the weight percentage content of the nonionic thickener in the bath oil is 3.5%, and other conditions are the same.

[0231] Example 14: Example 14 is different from Example 1 in that the weight percentage content of the nonionic thickener in the bath oil is 0.65%, and other conditions are the same.

[0232] Comparative Example 41: Compared with Example 1, Comparative Example 41 does not contain a nonionic thickener.

[0233] Comparative Example 42: Compared with Example 1, the difference between Comparative Example 42 is that the weight percentage content of the non-ionic thickener in the bath oil is 0.3%, and the other conditions are the same.

[0234] Comparative Example 43: Compared with Example 1, the difference between Comparative Example 43 is that the weight percentage content of the non-ionic thickener in the bath oil is 4.5%, and the other conditions are the same.

[0235] The moisturizing bath oils of Example 1, Examples 13-14, and Comparative Examples 41-43 were subjected to appearance observation, mildness test, foam performance test, moisturizing test, and water loss test, respectively. The test results are shown in Tables 12 to 14:

[0236] Table 12 Appearance observation and mildness test results of moisturizing bath oils of Example 1, Examples 13-14 and Comparative Examples 41-43

[0237]

[0238] The test results in Table 12 show that the amount of nonionic thickener added in the examples of the present invention is consistent with the oil's texture and exhibits no or mild irritation. However, when the nonionic thickener is added in smaller amounts, less than 0.5% (Comparative Example 42), or when it is added in larger amounts, exceeding 4% (Comparative Example 43), the mildness of the bath oil is significantly affected, resulting in a moderate irritation. Therefore, the weight percentage of nonionic thickener in the bath oil is preferably between 0.5% and 4%.

[0239] Table 13 Moisturizing bath oil foam performance test of Example 1, Examples 13-14 and Comparative Examples 41-43

[0240]

[0241] As shown in the test results in Table 13, the bath oils in the examples of the present invention foam quickly, produce abundant foam, and produce fine foam. However, the addition of a relatively small amount of nonionic thickener to the moisturizing bath oil, less than 0.5% (Comparative Example 42), and a relatively large amount of nonionic thickener, greater than 4% (Comparative Example 43), significantly affects the foaming properties of the bath oil. Therefore, the weight percentage of the nonionic thickener in the bath oil is preferably between 0.5% and 4%.

[0242] Table 14 Moisturizing performance test and water loss test of moisturizing bath oil of Example 1, Examples 13-14 and Comparative Examples 41-43

[0243]

[0244] As shown in the test results in Table 14, the bath oils in the present invention have a high moisture content growth rate and a low skin moisture loss rate. However, when the amount of nonionic thickener added to the moisturizing bath oil is relatively low, less than 0.5% (Comparative Example 42), the moisture content growth rate is low, and the skin moisture loss rate is relatively high. When the amount of nonionic thickener added is relatively high, greater than 4% (Comparative Example 43), the moisture content growth rate and skin moisture loss rate are not significantly affected. Therefore, the weight percentage of nonionic thickener in the bath oil is preferably between 0.5% and 4%.

[0245] 8. Comparison with commercially available bath oil and water

[0246] The moisturizing bath oil of Example 1 was tested for appearance, mildness, foam performance, heat sensation during washing, moisturizing performance, and water loss, respectively, along with commercially available bath oil (Comparative Example 44) and clean water (Comparative Example 45). The test results are shown in Tables 15 to 17 below:

[0247] Table 15 Appearance observation and mildness test of Example 1, Comparative Example 44-Comparative Example 45

[0248] Example / Comparative Example Appearance ES value Irritation determination Example 1 Similar to transparent oil 7 No / mild irritation Comparative Example 44 Similar to transparent oil 11 No / mild irritation Comparative Example 45 Watery 3 No / mild irritation

[0249] Table 16 Foam performance and heat sensation during washing test of Example 1, Comparative Example 44-Comparative Example 45

[0250]

[0251] Table 17 Example 1, Comparative Example 44-Comparative Example 45 Moisture Retention Test, Water Loss Test

[0252]

[0253] It can be seen from the test results in Tables 15-17 that the moisturizing bath oil of the present invention has excellent heating sensation and moisturizing performance compared with commercially available bath oil and water.

[0254] The above test results show that the moisturizing bath oil using the technical solution of the present invention has an oil-like texture, mild cleansing power, fast foaming, fine foam, good hydration and heating sensation, and obvious moisturizing effect. Bath oils lacking single or multiple ingredients such as amphoteric surfactants, nonionic surfactants, synthetic oils, glycerin, natural plant oils, and nonionic thickeners are difficult to achieve the ideal effects of excellent foaming effect, heating effect, hydration, moisturizing, and mildness.

[0255] In summary, the moisturizing bath oil of the present invention achieves appropriate mild cleaning power and foaming effect through the synergistic effect of different components; the rational combination of synthetic oil, glycerin and natural plant oil ensures the moisturizing and heating feeling during bath oil washing; the addition of a non-ionic thickener gives the bath oil a certain viscosity that conforms to the texture of oil; further, the combination of essence and rose water produces a synergistic effect, which makes people feel soothed and relaxed during washing, and brings long-lasting moisturizing and moisturizing experience to the skin after washing; finally, the addition of preservatives and citric acid makes the weak acid system of the bath oil stable and safe for a long time.

[0256] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A moisturizing bath oil, characterized in that: It is composed of the following components in weight percentage: Surfactant 32%-45%, synthetic oil 10%-18%, glycerin 25%-30%, natural plant oil 0.35%-1.5%, non-ionic thickener 0.5%-4%, flavor 0.1%-3.5%, rose water 0.01%-1%, preservative 0.2%-1%, citric acid 0.1%-2%, the balance is deionized water; The surfactant is a mixture of a nonionic surfactant and an amphoteric surfactant; the weight ratio of the nonionic surfactant to the amphoteric surfactant is 1:(1-3); The amphoteric surfactant is sodium cocoyl amphoacetate; The nonionic surfactant is composed of cocamide methyl MEA, cocoyl glucoside and polysorbate 20; the weight ratio of cocamide methyl MEA, cocoyl glucoside and polysorbate 20 is 1: (3-6): (2-5); The synthetic oil is composed of PEG-7 glyceryl cocoate, tocopheryl acetate, and a mixture of cocoyl glucoside and glyceryl oleate, and the weight ratio of the tocopheryl acetate, PEG-7 glyceryl cocoate, and the mixture of cocoyl glucoside and glyceryl oleate is 1: (45-70): (5-15); The natural plant oil is composed of lavender oil, rice bran oil, sunflower seed oil, soybean oil and cedarwood oil; The weight ratio of the natural plant oil, synthetic oil and glycerin is 1:(8-28):(18-54); The nonionic thickener is a mixture of PEG / PPG-120 / 10 trimethylolpropane trioleate and laureth-2.

2. The moisturizing bath oil according to claim 1, wherein The weight ratio of the nonionic surfactant to the amphoteric surfactant is 1:

2.

3. The moisturizing bath oil according to claim 1, wherein The preservative is selected from one or more of sodium benzoate and phenoxyethanol.

4. The method for preparing the moisturizing bath oil according to any one of claims 1 to 3, wherein: The following steps are involved: S1. Prepare the components by weight percentage; S2. The surfactant was added to deionized water and mixed at 15-35 ° C to obtain a phase A solution; S3. Add synthetic oil, glycerin, natural plant oil, non-ionic thickener, fragrance, rose water and preservative to the phase A solution in sequence, mix and stir at 15-35°C until the solution becomes light yellow and transparent. Finally, add citric acid to adjust the pH value to 5.5-6.5 to obtain a moisturizing bath oil.

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