A firming and lubricating composition, its preparation and use

Abstract

The present application relates to the technical field of personal care compositions, in particular to a tightening and lubricating composition and a preparation method and application thereof.The composition comprises the following components by mass fraction: modified fucoidan 5-15 parts, acetylated small molecule sodium hyaluronate 3-10 parts, oat beta-glucan 2-8 parts, hydrolyzed collagen peptide 2-6 parts, panthenol 1-5 parts, polyglycerol-10-lauric acid ester 1-4 parts, bis-ethylhexyloxyphenol methoxyphenyl triazine 0.5-2 parts, carnosine 0.3-1.5 parts, dipotassium glycyrrhizinate 0.1-1 part, trehalose 1-5 parts.The present application realizes the synergistic effect of instant lubrication, continuous moisturizing, tightening and moisturizing, and soothing and repairing by component compounding and fine preparation process, while ensuring mildness, effectively improving the stability and skin penetration efficiency of active ingredients.The composition can be used for preparing lubricants, intimate care products or functional skin care products.

Description

Technical Field

[0001] This invention relates to the field of lubricating composition technology, and more specifically to a tightening lubricating composition, its preparation method, and its application. Background Technology

[0002] As people pay increasing attention to their quality of life and personal health, the demand for personal care products that combine functionality, safety, and comfort is growing. Lubricating compositions, as products that can reduce friction, provide a smooth feel, and improve the user experience, are widely used in various scenarios such as sexual health care, medical device assistance, and daily skincare.

[0003] An ideal lubricating composition should possess the following characteristics: First, good lubrication performance, effectively reducing the coefficient of surface friction and providing a lasting smooth feel; second, biocompatibility and gentleness, not irritating mucous membranes and sensitive skin, and non-allergenic; third, certain skincare benefits, such as moisturizing, repairing, and firming, which can help improve the condition of local skin with long-term use; and fourth, good formula stability, not prone to microbial growth, and long shelf life.

[0004] However, existing lubricating compositions have many shortcomings. Traditional water-based lubricants often use polyols such as glycerin and propylene glycol as the moisturizing and lubricating base, supplemented with cellulose or carbomer as thickeners. While these products are inexpensive and provide adequate immediate lubrication, they lack long-lasting moisturizing capabilities and active repair and firming effects. Some products contain parabens or phenoxyethanol, which may cause burning or stinging sensations in sensitive individuals. More importantly, existing lubricating products often focus on the single function of "lubrication," neglecting the maintenance and repair of the skin and mucous membrane barriers during repeated or long-term use.

[0005] In recent years, with the deepening of research on the skin barrier, active ingredients such as fucoidan, sodium hyaluronate, and collagen peptides have been proven to have effects such as moisturizing, repairing, anti-oxidation, and promoting collagen synthesis. However, how to scientifically compound these ingredients and apply them to lubricating compositions to achieve multiple effects such as firming and repairing while maintaining excellent lubrication performance, and at the same time ensuring absolute gentleness when used on sensitive areas, remains a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the purpose of this invention is to provide a tightening lubricating composition, its preparation method and application, so as to solve the problems mentioned in the background art.

[0007] The present invention solves the technical problem by adopting the following technical solution: This invention provides a firming and lubricating composition comprising the following components in parts by weight: 5-15 parts modified fucoidan, 3-10 parts acetylated small molecule sodium hyaluronate, 2-8 parts oat β-glucan, 2-6 parts hydrolyzed collagen peptides, 1-5 parts panthenol, 1-4 parts polyglycerol-10-laurate, 0.5-2 parts bis-ethylhexyloxyphenol methoxyphenyl triazine, 0.3-1.5 parts carnosine, 0.1-1 parts dipotassium glycyrrhizate, and 1-5 parts trehalose.

[0008] The modified fucoidan was prepared by the following steps: (1) Take dried brown algae raw material, crush it and pass it through a 40-60 mesh sieve. Add citric acid-sodium citrate buffer solution with pH value of 4.0-5.5 at a mass-volume ratio of 1:15-25. Stir and extract at 45-55℃ for 2-4 hours, and filter to obtain primary extract. (2) Add 0.5-1.5 times the volume of 85%-95% ethanol to the primary extract for alcohol precipitation. After standing for 6-12 hours, centrifuge to collect the precipitate. The precipitate is then freeze-dried to obtain crude fucoidan. (3) Dissolve crude fucoidan in deionized water to prepare a solution with a mass concentration of 3%-8%, add vitamin C at a mass of 0.5%-2% of crude fucoidan, adjust the pH value to 8.0-9.0, and react at 60-70℃ for 1-3 hours to complete the oxidative modification; (4) The oxidized solution was ultrafiltered using an ultrafiltration membrane with a molecular weight cutoff of 3500-5000 Daltons. The filtrate was collected, precipitated again with ethanol, and freeze-dried to finally obtain the modified fucoidan.

[0009] The acetylated low-molecular-weight sodium hyaluronate has a molecular weight range of 5,000-20,000 Daltons and a degree of acetylation ranging from 0.6 to 1.2. This specific molecular weight range and degree of modification of the sodium hyaluronate allow it to possess both hydrophilic and lipophilic properties, enabling it to quickly penetrate the intercellular spaces of the stratum corneum and provide deep moisturizing and lubricating effects.

[0010] The hydrolyzed collagen peptides have a molecular weight range of 500-2000 Daltons and are derived from at least one of fish skin, bovine bone, or pig skin. These small-molecule collagen peptides can be absorbed by the skin, providing fibroblasts with the raw materials for collagen synthesis. Long-term use helps improve skin elasticity and firmness.

[0011] The oat β-glucan is prepared by the following steps: oat bran is subjected to steam explosion treatment at a pressure of 1.5-2.2 MPa for 60-120 seconds; the steam-exploded material is mixed with deionized water at a mass ratio of 1:10-20, and a complex enzyme system is added at 50-60°C for 2-4 hours of enzymatic hydrolysis; after enzymatic hydrolysis, the enzyme is inactivated by heat treatment, the supernatant is collected by centrifugation, concentrated, and then precipitated with lower alcohol. The precipitate is collected and dried to obtain oat β-glucan; the complex enzyme system is a complex enzyme composed of cellulase and β-glucanase at a mass ratio of 1-2:1, and the total amount added accounts for 1%-3% of the substrate mass.

[0012] Preferably, the composition further comprises the following components in parts by weight: 0.5-2 parts of tocopheryl acetate, 0.3-1 parts of 1,2-hexanediol, and 0.2-0.8 parts of p-hydroxyacetophenone, as an antioxidant and a mild preservative system.

[0013] The present invention also provides a method for preparing a tightening and lubricating composition, comprising the following steps: (1) Preparation of aqueous phase: Modified fucoidan, acetylated small molecule sodium hyaluronate, oat β-glucan, hydrolyzed collagen peptide, panthenol, trehalose, and dipotassium glycyrrhizate are dissolved in part of deionized water and stirred at 25-40℃ until completely dissolved to form an aqueous phase; (2) Preparation of alcohol phase: Bis-ethylhexyloxyphenol methoxyphenyl triazine, polyglycerol-10-laurate and carnosine are dissolved in ethanol and stirred evenly to form alcohol phase; (3) Emulsification: At a stirring speed of 300-600 rpm, slowly add the alcohol phase to the aqueous phase and continue stirring for 20-40 minutes to fully mix and emulsify it; (4) Volume adjustment: Add the remaining deionized water to make up the volume, and adjust the pH of the system to 5.0-6.5. Continue stirring for 10-20 minutes to ensure uniformity; (5) Filtration and sterilization: The mixture is sterilized by filtration through a 0.22-micron filter membrane to obtain a tight and lubricating composition.

[0014] Preferably, the amount of deionized water used in step (1) is 40%-60% of the total amount of deionized water; and the amount of ethanol used in step (2) is 70%-90% of the total mass of the alcohol phase.

[0015] This invention also provides applications of the aforementioned firming and lubricating composition, which is used in the preparation of water-based lubricants, intimate care gels, body lotions, hand creams, or functional serums. The composition is added in the formulation at a weight percentage of 5%-30%.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention constructs a four-dimensional efficacy system of "lubrication, moisturizing, firming, and repair" through a multi-component compound containing modified fucoidan, acetylated low-molecule sodium hyaluronate, hydrolyzed collagen peptides, and oat β-glucan. Modified fucoidan provides bioadhesion and enhanced lubrication, low-molecule sodium hyaluronate achieves deep moisturizing, collagen peptides promote collagen synthesis to improve firmness and elasticity, and panthenol and oat β-glucan synergistically repair the skin barrier, realizing a leap from single-function lubricant products to comprehensive care.

[0017] A balanced design that combines gentle penetration enhancement with skin-friendly lubrication: This invention uses polyglycerol-10-laurate as a green emulsifier and penetration enhancer, combined with bis-ethylhexyloxyphenol methoxyphenyl triazine to form a gentle penetration-enhancing system. This avoids the burning sensation and mucosal irritation that may be caused by high concentrations of polyols or chemical penetration enhancers in traditional lubricants. Simultaneously, the lipophilic modification of acetylated sodium hyaluronate allows it to anchor in the stratum corneum, providing a long-lasting lubricating film, rather than a temporary "watery" feel.

[0018] This invention utilizes vitamin C oxidative modification of fucoidan combined with ultrafiltration fractionation to obtain a modified product with uniform molecular weight and higher stability, significantly improving its solubility and resistance to degradation in formulations. Compared to traditional thermal extraction methods, the steam explosion-enzymatic hydrolysis technique for oat β-glucan yields higher yields and retains more complete activity, ensuring the efficacy of the final product.

[0019] This product utilizes an antioxidant system (tocopheryl acetate + carnosine) and a non-traditional preservative system (1,2-hexanediol + p-hydroxyacetophenone) to avoid potential allergens such as parabens and phenoxyethanol. Testing has shown that this composition is non-irritating to both normal and sensitive skin / mucous membranes, and its pH value is close to the human physiological environment, making it safe for use in intimate care settings.

[0020] The phase-separation emulsification method combined with a low-temperature addition process ensures the activity of heat-sensitive ingredients (such as carnosine and collagen peptides). The entire process is gentle, reproducible, and the resulting product has a clear or slightly emulsified appearance, moderate viscosity, and is easy to apply and wash off. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1 A tightening and lubricating composition, with a total mass of 100 parts, has the following components and preparation process: Preparation of modified fucoidan (1) Take dried kelp (brown algae raw material) and crush it through a 50-mesh sieve. Add a citric acid-sodium citrate buffer solution with pH 4.8 at a material-liquid ratio of 1:20. Stir and extract at 50°C for 3 hours. Filter to obtain primary extract. (2) Add 1 volume of 90% ethanol for alcohol precipitation. Let stand for 9 hours. Centrifuge to collect the precipitate. Freeze dry to obtain crude fucoidan. (3) Prepare a 5% aqueous solution of crude fucoidan. Add 1.2% of vitamin C by mass. Adjust the pH to 8.5. React at 65°C for 2 hours. (4) Use an ultrafiltration membrane with a molecular weight cutoff of 4500 Daltons for ultrafiltration. Collect the filtrate. Precipitate again with alcohol and freeze dry to obtain modified fucoidan.

[0023] II. Preparation of Oat β-glucan: Oat bran was steam-exploded at 2.0 MPa for 90 seconds. The exploded material was added to deionized water at a material-to-liquid ratio of 1:15, and a compound enzyme (cellulase:β-glucanase = 1.5:1, total addition 2%) was added. Enzymatic hydrolysis was carried out at 55℃ for 3 hours. After enzyme inactivation, the supernatant was collected by centrifugation, concentrated, and precipitated with 3 times the volume of 95% ethanol. The precipitate was collected by centrifugation and dried to obtain the final product.

[0024] III. Preparation of the composition: Weigh out the following by mass: Aqueous phase: 10 parts modified fucoidan, 6 parts acetylated small molecule sodium hyaluronate (molecular weight 10000 Da, degree of acetylation substitution 1.0), 5 parts oat β-glucan, 4 parts hydrolyzed collagen peptide (fish source, molecular weight 1000 Da), 3 parts panthenol, 3 parts trehalose, 0.6 parts dipotassium glycyrrhizate, dissolved in 35 parts deionized water, stirred at 30℃.

[0025] Alcohol phase: 1.2 parts of bis-ethylhexyloxyphenol methoxyphenyl triazine, 2.5 parts of polyglycerol-10-laurate, and 0.8 parts of carnosine, dissolved in 10 parts of 95% ethanol and stirred until homogeneous. Subsequent additions: 1 part of tocopheryl acetate, 0.6 parts of 1,2-hexanediol, and 0.4 parts of p-hydroxyacetophenone.

[0026] While stirring at 450 rpm, slowly add the alcohol phase to the aqueous phase and stir for 30 minutes until homogeneous emulsion is achieved. Cool to below 40°C, add the subsequent components, and stir for 15 minutes. Add deionized water to bring the volume to 100 parts, adjust the pH to 5.8, filter through a 0.22-micron filter membrane for sterilization, and then fill into containers.

[0027] Example 2 This embodiment is basically the same as Example 1, except that the component dosages are adjusted: The following components were added: 6 parts modified fucoidan, 9 parts acetylated sodium hyaluronate (molecular weight 5000 Da, degree of substitution 0.6), 3 parts oat β-glucan, 5 parts hydrolyzed collagen peptides, 2 parts panthenol, 4 parts trehalose, 0.3 parts dipotassium glycyrrhizate; 0.6 parts bis-ethylhexyloxyphenol methoxyphenyl triazine, 3.5 parts polyglycerol-10-laurate, 0.5 parts carnosine; and later added components: 0.6 parts tocopheryl acetate, 0.4 parts 1,2-hexanediol, and 0.3 parts p-hydroxyacetophenone. The remaining processes were the same as in Example 1.

[0028] Example 3 This embodiment is basically the same as Example 1, except that the component dosages are adjusted: 14 parts modified fucoidan, 4 parts acetylated small molecule sodium hyaluronate (molecular weight 18000 Da, degree of substitution 1.1), 7 parts oat β-glucan, 2.5 parts hydrolyzed collagen peptide, 4.5 parts panthenol, 2 parts trehalose, and 0.9 parts dipotassium glycyrrhizate. The following components were added: 1.8 parts of bis-ethylhexyloxyphenol methoxyphenyl triazine, 1.5 parts of polyglycerol-10-laurate, and 1.2 parts of carnosine; the following components were added later: 1.5 parts of tocopheryl acetate, 0.8 parts of 1,2-hexanediol, and 0.6 parts of p-hydroxyacetophenone. The remaining process was the same as in Example 1.

[0029] Comparative Example 1 Compared with Example 1, the difference is that no modified fucoidan was added, and the amount was made up with an equal amount of deionized water.

[0030] Comparative Example 2 Compared with Example 1, the difference is that ordinary high molecular weight sodium hyaluronate (molecular weight 1.2 million Daltons, unacetylated) is used instead of acetylated low molecular weight sodium hyaluronate, while the amount remains the same.

[0031] Comparative Example 3 Compared with Example 1, the difference is that hydrolyzed collagen peptides were not added, and the amount was made up with an equal amount of trehalose.

[0032] Comparative Example 4 Compared with Example 1, the difference is that bis-ethylhexyloxyphenol methoxyphenyl triazine and polyglycerol-10-laurate were not added, but replaced with an equal amount of propylene glycol.

[0033] Comparative Example 5 Compared with Example 1, the difference is that all components (except the anti-corrosion system) were added to deionized water at one time and mixed, stirred at room temperature, and emulsified without phase separation.

[0034] Performance testing The compositions prepared in Examples 1-3 and Comparative Examples 1-5 were subjected to systematic testing.

[0035] 1. Lubrication performance test A coefficient of friction meter was used to test the dynamic friction coefficient of samples under a pressure of 1 N and a speed of 100 mm / min, using detached pigskin as the contact surface. Each sample was tested five times, and the average value was taken. A lower coefficient of friction indicates better lubrication performance.

[0036]

[0037] Lubrication duration: The time required for the coefficient of friction to recover to above 0.10.

[0038] 2. Moisturizing performance test Using a Corneometer CM825 skin moisture analyzer, 30 healthy female volunteers (aged 25-45) were selected. An area was marked on the inner forearm, and an equal amount of sample was applied. The skin stratum corneum moisture content was measured at 0h, 2h, 4h, and 8h, and the difference between the sample and the blank control area was calculated.

[0039]

[0040] 3. Firmness and Elasticity Improvement Test Thirty volunteers (aged 35-55) with a tendency for neck / hand skin laxity were selected using the Cutometer MPA580 skin elasticity tester. Samples were applied to the inner forearm twice daily for eight consecutive weeks. Skin elasticity parameters R2 (total elasticity, the closer to 1 the better) and R7 (bioelasticity, reflecting firmness, the higher the better) were tested.

[0041]

[0042] 4. Mildness test Referring to ISO 10993-10 "Biological evaluation of medical devices – Part 10: Skin sensitization", a closed patch test was used, selecting 30 volunteers with sensitive skin (who reported easily experiencing stinging, burning, or redness to cosmetics or skincare products). The sample was placed in a patch applicator and applied to the back for 48 hours. Skin reactions were observed at 0.5h, 24h, and 48h after removal and scored from 0 to 4 (0 = no reaction, 1 = slight erythema, 2 = erythema, 3 = erythema + edema, 4 = severe reaction).

[0043] Results: No positive reactions were observed in Examples 1-3 (all scores were 0). In Comparative Example 4, two cases showed slight erythema (score 1), and in Comparative Example 5, one case showed slight erythema. This indicates that the composition of the present invention has excellent mildness and is especially suitable for use on intimate and sensitive areas.

[0044] Results Analysis Lubrication performance: The coefficients of dynamic friction in Examples 1-3 were significantly lower than those in the comparative examples, and the lubrication duration was longer. Comparative Example 1 (without fucoidan) showed a significant decrease in lubrication performance, indicating that modified fucoidan is crucial for the formation of a long-lasting lubricating film. Comparative Example 4 (with propylene glycol replacing the penetration-enhancing system) also showed poor lubrication, suggesting that the penetration-enhancing system not only promotes absorption but also participates in enhancing lubrication efficiency.

[0045] Moisturizing performance: The moisturizing effect of the examples was superior to that of the comparative examples at all time points, especially in terms of long-lasting moisturizing ability after 8 hours. Comparative Example 2 (ordinary sodium hyaluronate) had a larger molecular weight and was difficult to penetrate, resulting in less long-lasting moisturizing effect than the examples. Comparative Example 5 also showed a reduced moisturizing effect due to uneven dispersion of active ingredients caused by the lack of phase separation emulsification.

[0046] Firmness and elasticity: After 8 weeks of continuous use in the examples, skin elasticity parameters R2 and R7 were significantly improved, while the improvement rate was lowest in Comparative Example 3 (without collagen peptides), confirming the core role of hydrolyzed collagen peptides in promoting skin firmness and elasticity. The combination of modified fucoidan and acetylated sodium hyaluronate also indirectly contributed to the firming effect by enhancing skin hydration and matrix support.

[0047] Mildness: No irritation was observed in any of the embodiments of this invention, verifying the mildness of the formulation system. Comparative Example 4 (containing propylene glycol) showed isolated cases of slight irritation, indicating that the polyglycerol ester and non-traditional preservative system selected in this invention is more advantageous for applications in sensitive areas. In summary, this invention, through the scientific compounding of active ingredients such as modified fucoidan, acetylated small molecule sodium hyaluronate, and hydrolyzed collagen peptides, combined with a gentle penetration-enhancing system and unconventional preservative solutions, has successfully developed a firming and lubricating composition that combines excellent lubrication performance, long-lasting moisturizing, improved firmness and elasticity, and is highly gentle and safe. It can be widely used in the fields of high-end lubricants and intimate care products.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tightening and lubricating composition, characterized in that, The composition comprises the following components in parts by weight: 5-15 parts modified fucoidan, 3-10 parts acetylated small molecule sodium hyaluronate, 2-8 parts oat β-glucan, 2-6 parts hydrolyzed collagen peptides, 1-5 parts panthenol, 1-4 parts polyglycerol-10-laurate, 0.5-2 parts bis-ethylhexyloxyphenol methoxyphenyl triazine, 0.3-1.5 parts carnosine, 0.1-1 part dipotassium glycyrrhizate, and 1-5 parts trehalose.

2. The tightening and lubricating composition according to claim 1, characterized in that, The modified fucoidan was prepared by the following steps: (1) Take dried brown algae raw material, crush it and pass it through a 40-60 mesh sieve. Add citric acid-sodium citrate buffer solution with pH value of 4.0-5.5 at a mass-volume ratio of 1:15-25. Stir and extract at 45-55℃ for 2-4 hours, and filter to obtain primary extract. (2) Add 0.5-1.5 times the volume of 85%-95% ethanol to the primary extract for alcohol precipitation. After standing for 6-12 hours, centrifuge to collect the precipitate. The precipitate is then freeze-dried to obtain crude fucoidan. (3) Dissolve crude fucoidan in deionized water to prepare a solution with a mass concentration of 3%-8%, add vitamin C at a mass of 0.5%-2% of crude fucoidan, adjust the pH value to 8.0-9.0, and react at 60-70℃ for 1-3 hours to complete the oxidative modification; (4) The oxidized solution was ultrafiltered using an ultrafiltration membrane with a molecular weight cutoff of 3500-5000 Daltons. The filtrate was collected, precipitated again with ethanol, and freeze-dried to finally obtain the modified fucoidan.

3. The tightening and lubricating composition according to claim 1, characterized in that, The acetylated small molecule sodium hyaluronate has a molecular weight range of 5,000-20,000 Daltons and a degree of acetylation ranging from 0.6 to 1.

2.

4. The tightening and lubricating composition according to claim 1, characterized in that, The hydrolyzed collagen peptides have a molecular weight range of 500-2000 Daltons and are derived from at least one of fish skin, bovine bone, or pig skin.

5. The tightening and lubricating composition according to claim 1, characterized in that, The oat β-glucan was prepared by a method comprising the following steps: Take oat bran and steam it at a pressure of 1.5-2.2 MPa for 60-120 seconds. Mix the steam-exploded material with deionized water at a mass ratio of 1:10-20 and add a compound enzyme system at 50-60℃ for 2-4 hours for enzymatic hydrolysis. After enzymatic hydrolysis, the enzyme is inactivated by heat treatment, the supernatant is collected by centrifugation, concentrated and then precipitated by adding low alcohol. The precipitate is collected and dried to obtain oat β-glucan. The complex enzyme system is a complex enzyme composed of cellulase and β-glucanase, with a mass ratio of 1-2:1, and the total amount added accounts for 1%-3% of the substrate mass.

6. The tightening and lubricating composition according to claim 1, characterized in that, The composition also includes the following components in parts by weight: 0.5-2 parts of tocopheryl acetate, 0.3-1 part of 1,2-hexanediol, and 0.2-0.8 parts of p-hydroxyacetophenone.

7. A method for preparing the tightening and lubricating composition according to any one of claims 1-6, characterized in that, Includes the following steps: (1) Preparation of aqueous phase: Modified fucoidan, acetylated small molecule sodium hyaluronate, oat β-glucan, hydrolyzed collagen peptide, panthenol, trehalose, and dipotassium glycyrrhizate are dissolved in part of deionized water and stirred at 25-40℃ until completely dissolved to form an aqueous phase; (2) Preparation of alcohol phase: Bis-ethylhexyloxyphenol methoxyphenyl triazine, polyglycerol-10-laurate and carnosine are dissolved in ethanol and stirred evenly to form alcohol phase; (3) Emulsification: At a stirring speed of 300-600 rpm, slowly add the alcohol phase to the aqueous phase and continue stirring for 20-40 minutes to fully mix and emulsify it; (4) Volume adjustment: Add the remaining deionized water to make up the volume, and adjust the pH of the system to 5.0-6.

5. Continue stirring for 10-20 minutes to ensure uniformity; (5) Filtration and sterilization: The mixture is sterilized by filtration through a 0.22-micron filter membrane to obtain a tight and lubricating composition.

8. The preparation method according to claim 7, characterized in that, In step (1), the amount of deionized water used is 40%-60% of the total amount of deionized water used; in step (2), the amount of ethanol used is 70%-90% of the total mass of the alcohol phase.

9. The application of a tightening lubricating composition as described in any one of claims 1-6, characterized in that, The composition is used to prepare water-based lubricants, feminine care gels, body lotions, hand creams, or functional serums.

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