Preparation method of hydrogenated castor seed oil and application thereof in shower gel

Abstract

The application belongs to the field of daily chemicals, and particularly relates to a preparation method of hydrogenated castor seed oil and application of the hydrogenated castor seed oil in shower gel, comprising the following steps: S1. crushing castor seeds to obtain castor seed powder; S2. treating the castor seed powder in a low-frequency pulse electric field first, and then treating the castor seed powder in an intermittent microwave, and alternately treating for several times to obtain pretreated castor seed powder; S3. mixing the pretreated castor seed powder with a composite enzyme preparation, and performing subcritical extraction to obtain an extraction liquid; S4. performing vacuum filtration on the extraction liquid to obtain a refined filtrate; S5. mixing the refined filtrate with a palladium-carbon catalyst and performing a reaction to obtain a semi-finished product; and S6. performing pressure filtration on the semi-finished product through a fixed bed layer of palladium-carbon catalyst and special activated carbon to obtain the hydrogenated castor seed oil. The preparation method effectively retains natural glyceride structural components and trace moisturizing components in the castor seed oil, avoids generation of nickel residues and trans fatty acids, and greatly enhances the safety of the product.

Description

Technical Field

[0001] This invention belongs to the field of daily chemical products, specifically relating to a method for preparing hydrogenated castor seed oil and its application in shower gel. Background Technology

[0002] As a daily cleaning product, shower gel has evolved beyond basic cleansing to meet higher demands in the market, encompassing post-wash skin feel, moisturizing, and gentleness. Currently, most mainstream shower gels utilize a combination of anionic and amphoteric surfactants such as sodium lauryl ether sulfate (AES) and cocamidopropyl betaine (CAB). While these systems offer strong cleansing power and rich lather, they can easily lead to over-cleansing. Over-cleansing strips away the skin's natural sebum, damaging the skin barrier and causing post-wash skin tightness, dryness, and itching.

[0003] To improve the skin feel after washing, a common approach is to add small amounts of oils, such as jojoba oil, almond oil, or silicone oil. However, these hydrophobic components are difficult to stabilize in aqueous systems dominated by anionic surfactants, easily leading to precipitation and layering. Therefore, it's necessary to increase the amount of emulsifier, which exacerbates skin irritation. Furthermore, traditional oils lack sufficient moisturizing properties and cannot effectively repair the skin barrier. Regarding oil modification, hydrogenated castor oil possesses excellent stability and emulsifying properties, but the traditional hydrogenated castor oil preparation process has flaws. It easily leads to the destruction of natural moisturizing components such as ricinoleic acid, and there is also a risk of heavy metal nickel residue, which does not meet product safety standards. In addition, traditional hydrogenated castor oil has a large molecular weight, resulting in poor dispersibility and stability in high-surfactant shower gel systems. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a method for preparing hydrogenated castor seed oil and its application in shower gel, which effectively preserves the natural triglyceride structure and trace moisturizing components of castor seed oil. At the same time, it avoids the formation of nickel residue and trans fatty acids, greatly enhancing the safety of the product.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows: A method for preparing hydrogenated castor seed oil includes the following steps: S1. Dehull and wash the castor seeds, dry them at 45-50℃ until the moisture content is less than 5%, then grind them and pass them through a 50-200 mesh sieve to obtain castor seed powder; S2. Adjust the field strength of the low-frequency pulsed electric field to 3-5 kV / cm, the frequency to 20-50 kHz, the pulse width to 8-15 μs, and the duration to 30-60 s; adjust the power of the intermittent microwave to 300-500 W, the frequency to 2000-3000 MHz, and the duration to 30-60 s; treat the castor seed powder first in the low-frequency pulsed electric field, and then in the intermittent microwave, alternating the treatment several times to obtain pretreated castor seed powder; S3. Mix the pretreated castor seed powder with a compound enzyme preparation, which includes cellulase, pectinase, and hemicellulase. The amount of the compound enzyme preparation added is 4-6% of the mass of the pretreated castor seed powder. After mixing, add the extraction solvent and an entrainer of 3-5% of the volume of the extraction solvent. Perform subcritical extraction at a temperature of 35-40℃ for 1.5-2 hours. First, adjust the extraction pressure to 0.8-1.2 MPa and maintain it for 5-8 minutes. Then, within 2-3 minutes, increase the extraction pressure to 1.2-1.5 MPa at a constant rate and maintain it for 3-5 minutes. Finally, within 2-3 minutes, decrease the extraction pressure to 0.5 MPa at a constant rate and maintain it for 8-10 minutes. Repeat the above extraction process three times. During the extraction, stir at a low speed of 60 r / min and adjust the flow rate of the extraction solvent to 1.0-1.5 L / min. Collect the extract. S4. The extract is vacuum filtered through a 5–20 μm microporous membrane at a vacuum level of -0.06 to -0.09 MPa to obtain crude oil. The crude oil is then subjected to primary molecular distillation at a temperature of 80–85 °C and a pressure of 0.1–0.5 mbar to obtain the primary distillate. The primary distillate is then subjected to secondary molecular distillation at a temperature of 120–125 °C and a pressure of 0.01–0.05 mbar to obtain the secondary distillate. The secondary distillate is then subjected to tertiary molecular distillation at a temperature of 160–165 °C and a pressure of 0.001–0.005 mbar to obtain the tertiary distillate. The tertiary distillate is then filtered through a 0.1–0.2 μm microporous membrane to obtain the fine filtrate. S5. Transfer the filtrate to a reactor in a hydrogen atmosphere, and then mix it with a palladium-on-carbon catalyst. The amount of palladium-on-carbon catalyst added is 0.5-1% of the mass of the filtrate. Continuously introduce hydrogen gas and maintain the hydrogen pressure at 2-3 MPa. React at a temperature of 80-100℃ for 3-4 hours, and control the iodine value to 80-85 gI2 / 100g to obtain a semi-finished product. S6. After cooling the semi-finished product to room temperature, it is passed through a fixed bed of activated carbon containing palladium on carbon catalyst. The flow rate of the semi-finished product is adjusted to 1.0-2.0 BV / h, the height-to-diameter ratio of the activated carbon bed is 3-5:1, and the mesh size of the activated carbon is 20-40 mesh to obtain a primary filtrate. The primary filtrate is then pressure filtered using a 0.2-0.5 μm filter element at a pressure of 0.1-0.3 MPa. The filtrate is collected to obtain hydrogenated castor seed oil.

[0006] Further, in step S3, the mass ratio of cellulase, pectinase, and hemicellulase is 3:1:2.

[0007] Further, in step S3, the extraction solvent is dimethyl ether, and the entrainer is anhydrous ethanol.

[0008] Through the above technical solution, firstly, the alternating synergistic treatment of pulsed electric field and intermittent microwave achieves efficient cell wall disruption of castor seeds, creating favorable conditions for subsequent extraction; secondly, the established compound enzyme-assisted subcritical fluid extraction system achieves efficient and selective extraction of target components under low-temperature conditions. The combination of pulsed-microwave pretreatment and compound enzyme-assisted subcritical extraction achieves efficient cell wall disruption and extraction under low-temperature conditions (<50℃), maximizing the retention of natural active ingredients. Compared with traditional high-temperature and high-pressure processes (>150℃), this invention effectively retains the natural active ingredients in castor seed oil, such as heat-sensitive components like tocopherols and phytosterols. The multi-stage molecular distillation-membrane separation coupled purification process used in the preparation process enables precise separation of fatty acid components and efficient removal of impurities, improving the purity of effective substances. The use of a noble metal catalyst to complete the hydrogenation reaction under mild conditions avoids heavy metal residues and the formation of trans fatty acids. The preparation process uses green solvents such as subcritical dimethyl ether to replace traditional organic solvents such as n-hexane, achieving solvent-free residue. It meets the requirements of green chemistry and sustainable development, while avoiding the formation of nickel residue and trans fatty acids, greatly enhancing the safety of the product.

[0009] This invention provides a shower gel prepared from the above-mentioned hydrogenated castor seed oil, comprising: 1.5-5.0% hydrogenated castor seed oil prepared according to this invention; 15.0-25.0% surfactant; 1.0-5.0% stabilizer and synergist; 1.0-4.0% auxiliary cleaning and foaming agent; 3.0-8.0% moisturizer; 0.01-0.1% chelating agent; 0.5-2.0% viscosity modifier; 0.4-0.8% preservative; 0.01-0.5% pH adjuster; 0.5-1.5% fragrance; and the balance being deionized water. The stabilizing and enhancing agent is PEG-7 glyceryl cocoate.

[0010] Preferably, the shower gel prepared from the above-mentioned hydrogenated castor seed oil comprises 2.0-3.0% hydrogenated castor seed oil; 15.0-25.0% surfactant; 1.0-5.0% stabilizer and synergist; 1.0-4.0% auxiliary cleaning and foaming agent; 3.0-8.0% moisturizer; 0.01-0.1% chelating agent; 0.5-2.0% viscosity modifier; 0.4-0.8% preservative; 0.01-0.3% pH adjuster; 0.5-1.5% fragrance; and the balance being deionized water. The stabilizing and enhancing agent is PEG-7 glyceryl cocoate.

[0011] Furthermore, the surfactant includes anionic surfactants and amphoteric surfactants; the anionic surfactant includes at least one of sodium lauryl ether sulfate, sodium lauryl sulfate, and sodium lauroyl amino acid; the amphoteric surfactant includes at least one of cocamidopropyl betaine, cetyl dimethyl hydroxyethyl dihydrogen phosphate, and sodium lauroyl amphoteric acetate.

[0012] Furthermore, the auxiliary cleaning and foaming agent includes at least one of cocamide DEA, cocamide MEA, and sodium lauroyl methyl hydroxyethyl sulfonate.

[0013] Furthermore, the chelating agent includes at least one of disodium EDTA, tetrasodium EDTA, and tetrasodium glutamate diacetate.

[0014] Furthermore, the moisturizer includes at least one of glycerin, dipropylene glycol, panthenol, sodium PCA, sodium hyaluronate, and saccharide isomers.

[0015] Furthermore, the viscosity modifier includes at least one of sodium chloride, ammonium chloride, hydroxyethyl cellulose, acrylic / C10-30 alkanol acrylate crosslinked polymer, and acrylate / C10-30 alkanol acrylate crosslinked polymer.

[0016] Furthermore, the preservative includes at least one of sodium benzoate, phenoxyethanol, p-hydroxyacetophenone, 1,2-hexanediol, and octanoyl hydroxamic acid.

[0017] Furthermore, the pH adjuster includes at least one of citric acid, sodium citrate, lactic acid, sodium hydroxide, and triethanolamine.

[0018] The present invention has the following beneficial effects: 1. The method for preparing hydrogenated castor seed oil of the present invention effectively preserves the natural triglyceride structural components and trace moisturizing components in castor seed oil through compound enzyme-assisted cold pressing and membrane-coupled low-temperature refining technology. At the same time, it avoids the formation of nickel residue and trans fatty acids, greatly enhancing the safety of the product.

[0019] 2. By introducing PEG-7 glyceryl cocoate as a stabilizer and synergist, and compounding it with hydrogenated castor seed oil in a specific ratio, the high-content oil content becomes more stable in anionic surfactant systems. After using and rinsing with this invention, a uniform, breathable moisturizing protective film is formed on the skin surface, providing a long-lasting moisturizing effect. This invention's shower gel improves transepidermal water loss, increases stratum corneum moisture content, and enhances skin hydration and smoothness after use.

[0020] 3. In this invention, hydrogenated castor seed oil has a synergistic effect with moisturizers such as sodium PCA and glycerin. By adsorbing and forming a film on the skin surface, they can jointly block water evaporation and achieve the functions of instant moisturization and long-lasting hydration.

[0021] 4. The shower gel of the present invention has a pH value similar to that of the skin, and through the compounding of components and the improvement of the preparation method of hydrogenated castor seed oil, the direct irritation of surfactants to the skin is reduced, resulting in excellent safety. Detailed Implementation

[0022] To make the technical problems, solutions, and advantages of this invention clearer, a detailed description will be provided below with reference to specific examples. However, the scope of protection of this invention is not limited to the following specific embodiments. The described embodiments are merely some, not all, of the embodiments of this invention, and are not intended to limit the invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0024] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0025] In the quantitative experiments in the following examples, three replicate experiments were set up, and the data are the average of the three replicate experiments or the average ± standard deviation.

[0026] The present invention includes Examples 1 to 3 and Comparative Examples 1 to 4, and the specific components and contents are shown in Table 1, in units of weight percentage.

[0027] Table 1

[0028] Specifically, the method for preparing hydrogenated castor seed oil according to the present invention in the above embodiments and comparative examples includes the following steps: S1. Dehull and wash the castor seeds, dry them at 45-50℃ until the moisture content is less than 5%, then grind them and pass them through a 100-mesh sieve to obtain castor seed powder; S2. Adjust the field strength of the low-frequency pulsed electric field to 4kV / cm, the frequency to 30kHz, the pulse width to 10μs, and the duration to 30s; adjust the power of the intermittent microwave to 400W, the frequency to 2450MHz, and the duration to 30s; treat the castor seed powder first in the low-frequency pulsed electric field, and then in the intermittent microwave, alternating the treatment three times to obtain pretreated castor seed powder; S3. Mix the pretreated castor seed powder with a compound enzyme preparation, which includes cellulase, pectinase, and hemicellulase, in a mass ratio of 3:1:2. The amount of the compound enzyme preparation added is 5% of the mass of the pretreated castor seed powder. After mixing, add the extraction solvent and an entrainer of 3-5% of the volume of the extraction solvent. Perform subcritical extraction using dimethyl ether as the extraction solvent, at a temperature of 38°C for 2 hours. First, adjust the extraction pressure to 0.8 MPa and maintain it for 5 minutes. Then, within 2 minutes, increase the extraction pressure to 1.2 MPa at a constant rate and maintain it for 3 minutes. Finally, within 2 minutes, decrease the extraction pressure to 0.5 MPa at a constant rate and maintain it for 8 minutes. Repeat the above extraction process three times. During the extraction, stir at a low speed of 60 r / min and adjust the flow rate of the extraction solvent to 1.0 L / min. Collect the extract. S4. The extract was vacuum filtered through a 15 μm microporous membrane at a vacuum level of -0.08 MPa to obtain crude oil. The crude oil was then subjected to first-stage molecular distillation at 82 °C and 0.3 mbar to obtain the first-stage distillate. The first-stage distillate was then subjected to second-stage molecular distillation at 123 °C and 0.03 mbar to obtain the second-stage distillate. The second-stage distillate was then subjected to third-stage molecular distillation at 162 °C and 0.003 mbar to obtain the third-stage distillate. The third-stage distillate was filtered through a 0.1 μm ceramic membrane to obtain the fine filtrate. S5. Transfer the filtrate to a reactor in a hydrogen atmosphere, and then mix it with a palladium-on-carbon catalyst. The amount of palladium-on-carbon catalyst added is 0.8% of the mass of the filtrate. Continuously introduce hydrogen gas and maintain the hydrogen pressure at 2.5 MPa. React at 90℃ for 3.5 h and control the iodine value to 80 g I2 / 100 g to obtain a semi-finished product. S6. After cooling the semi-finished product to room temperature, it is passed through a fixed bed of activated carbon containing palladium on carbon catalyst. The flow rate of the semi-finished product is adjusted to 1.5 BV / h, the height-to-diameter ratio of the activated carbon bed is 3:1, and the mesh size of the activated carbon is 40 mesh. The first-stage filtrate is obtained. The first-stage filtrate is then pressure filtered through a 0.2 μm polytetrafluoroethylene filter element at a pressure of 0.3 MPa. The filtrate is collected to obtain hydrogenated castor seed oil.

[0029] The conventional hydrogenated castor oil in the comparative example is a commercially available product. The preparation method of conventional hydrogenated castor oil includes the following steps: D1. After removing impurities and washing the castor seeds, dry them at 108℃ until the moisture content is less than 8%, then crush and roll them into blanks with a thickness of about 0.4mm. D2. The raw material is fed into a screw press for high-temperature pressing, with the pressing temperature controlled at 125℃, to obtain crude oil and cake. D3. The crude oil is subjected to refining processes such as alkali refining and deacidification, bleaching clay decolorization, and steam distillation deodorization to obtain refined castor seed oil; D4. Transfer the refined castor oil to a high-pressure reactor, add a nickel catalyst (0.3% of the oil weight), introduce hydrogen gas, control the reaction temperature at 200℃, the hydrogen pressure at 5MPa, and the reaction time at 5 hours, and control the iodine value to drop to 88gI2 / 100g to obtain the hydrogenated crude product. D5. The crude hydrogenated product is filtered to remove the nickel catalyst, and then decolorized and deodorized to obtain commercially available hydrogenated castor seed oil.

[0030] Specifically, the preparation method of the above embodiments includes the following steps: A1. Mix deionized water, disodium EDTA, glycerin, and sodium PCA and heat to 78°C with stirring until completely dissolved. Then add sodium lauryl ether sulfate and continue stirring until completely dissolved to obtain material 1. A2. Add cocamide DEA, hydrogenated castor oil prepared by the method of this invention, and PEG-7 glyceryl cocoate to another container, heat to 48°C and stir until completely clear and homogeneous to obtain material 2; A3. Add material 2 to material 1 and homogenize for 8 minutes to obtain material 3; A4. Cool material 3 to 48°C, add cocamidopropyl betaine, sodium benzoate, phenoxyethanol, and flavoring, and stir slowly for 15 minutes to obtain material 4; A5. Add sodium chloride to material 4 and stir until completely dissolved. Adjust the viscosity to 7000 cps. Then add citric acid that has been dissolved in a small amount of water to adjust the pH to 5.5-6.5. Cool to below 35°C and discharge to obtain the finished product.

[0031] The preparation method for the comparative example can be obtained in the same way. If there are substances that are not added or replaced, they can be deleted or replaced in the corresponding preparation steps.

[0032] Testing and Inspection Volunteer grouping and process: 70 volunteers aged 20-50 (with dry skin) were recruited and randomly divided into 7 groups of 10 people each. The volunteers were tested on half-body (left / right arm or left / right leg) for 4 weeks using the compositions of Examples 1-3 and Comparative Examples 1-4.

[0033] Environmental requirements: All tests were conducted in a temperature and humidity controlled room at 21.0±1.0℃ and 50%±5%RH. Volunteers were required to sit quietly in this environment for at least 30 minutes to acclimatize and expose the areas to be tested.

[0034] Test area marking: Mark test areas of equal size on the inside of the volunteer's arms or the front of the volunteers' legs.

[0035] General Pre-Test Preparation: No skincare products should be used on the test area for 24 hours prior to the test. Before each test, volunteers cleanse the test area with a uniform, mild, non-moisturizing cleanser, rinse thoroughly with water, and gently pat dry with a lint-free tissue before sitting quietly. During the formal test, a trained operator applies the product uniformly: 1.0 gram (accurately weighed) of the test example or comparative sample is taken, foamed with a foaming net, and evenly applied to the marked test area. The area is massaged in circular motions with fingertips for 30 seconds, then rinsed with running water at a flow rate of 5 L / min and a temperature of 38 ± 1 °C for 30 seconds. Finally, the surface moisture is gently patted dry with a lint-free tissue. This procedure simulates a daily bathing process, ensuring that the dosage, application time, and rinsing conditions are completely consistent for each test.

[0036] 1. Change rate of cuticle water content 1 hour after sample application Testing instrument: Corneometer CM825 moisture test probe Test principle: The degree of hydration of the stratum corneum is measured based on the principle of capacitance.

[0037] Test Method: After completing the product application and drying process as described in the "General Pre-Test Preparation and Sample Use Method" above (T0), immediately measure the stratum corneum moisture content at three different points within the test area and take the average value as the initial value. After cleaning and drying, allow the product to stand for 1 hour (T1h), and measure the moisture content at the same three points within the same test area again, taking the average value. Calculate the increase in moisture content at T1h relative to T0.

[0038] Data calculation: Change rate of cuticle water content = (T1h value - T0 value) / T0 value × 100% 2. Transdermal water loss value 2 hours after sample application Testing instrument: Tewameter TM300 moisture loss probe Test principle: Based on Fick's law of diffusion to reflect the transdermal water loss rate.

[0039] Test Method: Follow the "General Preparation and Sample Use Method" above to use the product. After washing and drying, allow the product to stand for 2 hours (T2h). Place the probe vertically against the test area of ​​skin and record the transepidermal water loss value after the reading stabilizes. The lower the value, the better the skin barrier function and the longer the moisturizing effect.

[0040] 3. Rate of change in skin roughness (Ra value) Testing instrument: Visioscan VC98 + silicone replication method Test principle: The smoothness of skin surface texture is evaluated through image analysis.

[0041] Test method: On the first day of the test (Day 0, D0) and 2 hours after washing (T2h) 4 weeks after using the product (Day 28, D28), silicone replicas were made in the same marked area and the Ra value was measured. The lower the Ra value, the smoother the skin.

[0042] Data calculation: Skin roughness (Ra value) change rate (%) = (Ra value of D0 - Ra value of D28) / Ra value of D0 × 100% 4. Lactic acid sting test Test method: After using the product for 4 weeks, 0.1 mL of 5% lactic acid solution was applied to the nasolabial folds of volunteers, and the stinging sensation scores of volunteers at 0, 2.5 and 5 minutes were recorded.

[0043] Stinging sensation rating scale: 0 points: No stinging sensation; 1 point: Mild tingling, weak and brief sensation; 2 points: Moderate stinging pain, noticeable but tolerable; 3 points: Severe stinging pain, intense sensation, burning sensation; 4 points: Extremely severe stinging pain, unbearable, requires immediate cleaning.

[0044] Data recording: Calculate the sum of stinging scores at all time points (0, 2.5, 5 minutes). The lower the total score, the gentler the product and the better its repair and protection of the skin barrier.

[0045] 5. Subjective Moisturizing Level Rating (0-10 points) Test principle: Visual Analog Scale (VAS) Testing Method: Two hours after each product application (T2h) following the "General Pre-Test Preparation and Sample Use Method" outlined above, volunteers provided a comprehensive score based on skin dryness, tightness, and smoothness. A score of 0 indicated "extreme dryness and tightness," while a score of 10 indicated "continuous hydration and no tightness." The average score for the entire group was recorded over four weeks.

[0046] 6. Subjective skin feel preference rating (0-10 points) Test principle: Visual Analog Scale (VAS) Testing Method: After each use of the product according to the "General Pre-Test Preparation and Sample Usage Method" described above, volunteers comprehensively evaluated the product's foaming properties, rinsing properties, slippery feel, and residue. A score of 0 indicates "strongly dislike," and a score of 10 indicates "strongly like." The average score over four weeks was recorded.

[0047] The specific test results for the above test items are shown in Table 2.

[0048] Table 2

[0049] The test results of Examples 1 to 3 show that the composition of the present invention can increase the moisture content of the stratum corneum, the skin's hydration and smoothness, and also has long-lasting moisturizing effect, improves skin roughness, strengthens the skin barrier function, solves the problem of dry and tight skin after washing, and can reduce the direct irritation of surfactants to the skin. It is suitable for use on sensitive skin, and the effect of Example 2 is better.

[0050] A comparison of the test results of Example 2 with those of Comparative Examples 1 and 3 shows that, compared to replacing an equal amount of the hydrogenated castor seed oil prepared in this invention with ordinary hydrogenated castor seed oil or not adding hydrogenated castor seed oil at all, adding the hydrogenated castor seed oil prepared in this invention provides better long-lasting moisturizing, skin roughness improvement, and skin barrier function enhancement effects, and can reduce the irritation of the composition to the skin. This indicates that the hydrogenated castor seed oil prepared in this invention retains more effective ingredients and reduces nickel residue and trans fatty acids, thereby enhancing the safety of the composition.

[0051] A comparison of the test results of Example 2 with those of Comparative Examples 1, 2, and 4 shows that, compared to replacing PEG-7 glyceryl cocoate with an equal amount of jojoba oil or not adding PEG-7 glyceryl cocoate, the addition of hydrogenated castor seed oil prepared in this invention and the synergistic stabilizer PEG-7 glyceryl cocoate provides better long-lasting moisturizing, skin roughness improvement, and user experience. This indicates that the synergistic stabilizer of this invention can enhance the stability of the hydrogenated castor seed oil prepared in this invention, and the two have a synergistic effect, jointly improving the performance of the composition of this invention.

[0052] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0053] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0054] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A method for preparing hydrogenated castor seed oil, characterized in that, Includes the following steps: S1. Dehull and wash the castor seeds, dry them at 45-50℃ until the moisture content is less than 5%, then grind them and pass them through a 50-200 mesh sieve to obtain castor seed powder; S2. Adjust the field strength of the low-frequency pulsed electric field to 3-5 kV / cm, the frequency to 20-50 kHz, the pulse width to 8-15 μs, and the duration to 30-60 s; adjust the power of the intermittent microwave to 300-500 W, the frequency to 2000-3000 MHz, and the duration to 30-60 s; treat the castor seed powder first in the low-frequency pulsed electric field, and then in the intermittent microwave, alternating the treatment several times to obtain pretreated castor seed powder; S3. Mix the pretreated castor seed powder with a compound enzyme preparation, which includes cellulase, pectinase, and hemicellulase. The amount of the compound enzyme preparation added is 4-6% of the mass of the pretreated castor seed powder. After mixing, add the extraction solvent and an entrainer of 3-5% of the volume of the extraction solvent. Perform subcritical extraction at a temperature of 35-40℃ for 1.5-2 hours. First, adjust the extraction pressure to 0.8-1.2 MPa and maintain it for 5-8 minutes. Then, within 2-3 minutes, increase the extraction pressure to 1.2-1.5 MPa at a constant rate and maintain it for 3-5 minutes. Finally, within 2-3 minutes, decrease the extraction pressure to 0.5 MPa at a constant rate and maintain it for 8-10 minutes. Repeat the above extraction process three times. During the extraction, stir at a low speed of 60 r / min and adjust the flow rate of the extraction solvent to 1.0-1.5 L / min. Collect the extract. S4. The extract is vacuum filtered through a 5–20 μm microporous membrane at a vacuum level of -0.06 to -0.09 MPa to obtain crude oil. The crude oil is then subjected to primary molecular distillation at a temperature of 80–85 °C and a pressure of 0.1–0.5 mbar to obtain the primary distillate. The primary distillate is then subjected to secondary molecular distillation at a temperature of 120–125 °C and a pressure of 0.01–0.05 mbar to obtain the secondary distillate. The secondary distillate is then subjected to tertiary molecular distillation at a temperature of 160–165 °C and a pressure of 0.001–0.005 mbar to obtain the tertiary distillate. The tertiary distillate is then filtered through a 0.1–0.2 μm microporous membrane to obtain the fine filtrate. S5. Transfer the filtrate to a reactor in a hydrogen atmosphere, and then mix it with a palladium-on-carbon catalyst. The amount of palladium-on-carbon catalyst added is 0.5-1% of the mass of the filtrate. Continuously introduce hydrogen gas and maintain the hydrogen pressure at 2-3 MPa. React at a temperature of 80-100℃ for 3-4 hours, and control the iodine value to 80-85 gI2 / 100g to obtain a semi-finished product. S6. After cooling the semi-finished product to room temperature, it is passed through a fixed bed of activated carbon containing palladium on carbon catalyst. The flow rate of the semi-finished product is adjusted to 1.0-2.0 BV / h, the height-to-diameter ratio of the activated carbon bed is 3-5:1, and the mesh size of the activated carbon is 20-40 mesh to obtain a primary filtrate. The primary filtrate is then pressure filtered using a 0.2-0.5 μm filter element at a pressure of 0.1-0.3 MPa. The filtrate is collected to obtain hydrogenated castor seed oil.

2. The method for preparing hydrogenated castor seed oil according to claim 1, characterized in that, In step S3, the extraction solvent is dimethyl ether, and the entrainer is anhydrous ethanol.

3. A shower gel, characterized in that, Includes the following components by weight percentage: The hydrogenated castor seed oil prepared by the method according to any one of claims 1 to 2 comprises: 1.5–5.0%; surfactant; 15.0–25.0%; stabilizer and synergist; 1.0–5.0%; auxiliary cleaning and foaming agent; 3.0–8.0%; chelating agent; 0.01–0.1%; viscosity modifier; 0.5–2.0%; preservative; 0.4–0.8%; pH adjuster; 0.01–0.5%; fragrance; and the balance being deionized water. The stabilizing and enhancing agent is PEG-7 glyceryl cocoate.

4. The shower gel according to claim 3, characterized in that, The surfactants include anionic surfactants and amphoteric surfactants; the anionic surfactants include at least one of sodium lauryl ether sulfate, sodium lauryl sulfate, and sodium lauroyl amino acid; the amphoteric surfactants include at least one of cocamidopropyl betaine, cetyl dimethyl hydroxyethyl dihydrogen phosphate, and sodium lauroyl amphoteric acetate.

5. The shower gel according to claim 3, characterized in that, The auxiliary cleaning and foaming agents include at least one of cocamide DEA, cocamide MEA, and sodium lauroyl methyl hydroxyethyl sulfonate.

6. The shower gel according to claim 3, characterized in that, The chelating agent includes at least one of disodium EDTA, tetrasodium EDTA, and tetrasodium glutamate diacetate.

7. The shower gel according to claim 3, characterized in that, The moisturizer includes at least one of glycerin, dipropylene glycol, panthenol, sodium PCA, sodium hyaluronate, and saccharide isomers.

8. The shower gel according to claim 3, characterized in that, The viscosity modifier includes at least one of sodium chloride, ammonium chloride, hydroxyethyl cellulose, acrylic / C10-30 alkanol acrylate crosslinked polymer, and acrylate / C10-30 alkanol acrylate crosslinked polymer.

9. The shower gel according to claim 3, characterized in that, The preservative includes at least one of sodium benzoate, phenoxyethanol, p-hydroxyacetophenone, 1,2-hexanediol, and octanoyl hydroxamic acid.

10. The shower gel according to claim 3, characterized in that, The pH adjuster includes at least one of citric acid, sodium citrate, lactic acid, sodium hydroxide, and triethanolamine.

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