Hydrophilic modified organic silicon elastomer with moisturizing property and preparation method thereof

Abstract

The invention relates to the field of daily chemical personal care, in particular to a hydrophilic modified organic silicon elastomer with moisturizing performance and a preparation method thereof, and the hydrophilic modified organic silicon elastomer comprises the following components: polysiloxane containing at least three Si-H units in a molecule; a polysiloxane that is terminated by a divinyl group; the single-ended vinyl polysiloxane is modified by hyaluronic acid; vinyl polysiloxane modified by polyethylene glycol; a carrier fluid; and a platinum metal catalyst is used for hydrosilylation. The organic silicon elastomer is subjected to hydrophilic modification by introducing a hyaluronic acid segment and a polyethylene glycol chain segment, so that the moisturizing performance of the organic silicon elastomer is improved, and the organic silicon elastomer can effectively enhance the moisturizing feeling of skin and reduce the drying and tightening phenomena when being applied to cosmetics. The modified elastomer has a good self-emulsifying characteristic, and can easily form a stable gel system in a water-based or water-containing formula, so that the emulsifying process is simplified, and the applicability and stability of the formula are improved.

Description

Technical Field

[0001] The present invention relates to the field of daily chemical personal care, and specifically to a hydrophilic modified silicone elastomer with moisturizing properties and a preparation method thereof. Background Art

[0002] Silicone elastomers are excellent cosmetic ingredients for skin feel and viscosity control, with a unique silky and powdery feel. They are favored by formulators and used in a wide range of personal care products. As silicone polymers with a cross-linked three-dimensional network, they impart a smooth feel to skin in skincare products and effectively shape hair and improve wet or dry combing in hair products, while also providing thickening and oil-reducing properties. However, when used in water-based cosmetic formulations, unmodified silicone elastomers exhibit poor film-forming properties and less than ideal compatibility with other ingredients, often requiring the addition of emulsifiers. Furthermore, in actual use, silicone elastomers exhibit poor compatibility with skin sebum, resulting in a lack of moisturizing and hydrating properties, leading to a tendency to rub off and feel tight. This is largely due to the limited compatibility of silicone elastomers with various personal care ingredients, active ingredients, and health care actives. Therefore, improving existing silicone elastomers to enhance their compatibility with formulation components and moisturizing properties has become a key area of ​​research for silicone elastomer modification. Summary of the Invention

[0003] The present invention aims to provide a hydrophilically modified silicone elastomer with moisturizing properties and a method for its preparation. By introducing hyaluronic acid segments and polyethylene glycol segments into the silicone elastomer, its moisturizing properties are enhanced, effectively enhancing skin moisturization and reducing dryness and tightness in cosmetic applications. The modified elastomer exhibits excellent self-emulsifying properties and can easily form a stable gel system in water-based or aqueous formulations, simplifying the emulsification process and improving the formula's applicability and stability.

[0004] In order to solve the above technical problems, the following technical solution is adopted: a hydrophilic modified silicone elastomer with moisturizing properties is provided, comprising the following components: a polysiloxane containing at least three Si-H units in the molecule; a divinyl-terminated polysiloxane; a single-end vinyl polysiloxane modified with hyaluronic acid; a polyethylene glycol-modified vinyl polysiloxane; a carrier fluid; and a platinum metal catalyst for hydrosilylation.

[0005] Furthermore, the weight percentages of the components are: 2-6% polysiloxane containing at least 3 Si-H units in the molecule; 0.2-1.2% hyaluronic acid-modified single-end vinyl polysiloxane; 0.2-1.2% polyethylene glycol-modified vinyl polysiloxane; 8-18% divinyl-terminated polysiloxane; 75-90% carrier fluid; and 0.05-0.1% platinum catalyst.

[0006] Furthermore, the polysiloxane containing at least 3 Si-H units in the molecule is a polysiloxane containing at least 3 Si-H groups in the side chain, the ratio of the amount of D segments to D' segments in the segment is 5-20, the weight percentage of H in the Si-H group in the molecule is 0.05%-0.5%, and the molecular weight is 1000-20000.

[0007] Furthermore, the divinyl-terminated polysiloxane has a vinyl content of 0.15%-5%, a degree of polymerization of 10-500, and a molecular weight of 1000-20000.

[0008] Furthermore, the hyaluronic acid-modified single-end vinyl polysiloxane is prepared by the following method: unmodified low molecular weight hyaluronic acid is reacted with dimethylvinylethoxysilane in the presence of an organic titanium catalyst to form a single-end vinyl-modified hyaluronic acid derivative.

[0009] Furthermore, the polyethylene glycol-modified vinyl polysiloxane is a single-end vinyl polysiloxane, wherein the vinyl content is 0.1%-0.6% and the polyethylene glycol repeating unit is 8-25.

[0010] Furthermore, the carrier fluid is selected from one or more of low-viscosity polydimethylsiloxane with a viscosity of 1-50 mPa·s, decamethylcyclopentasiloxane, isoparaffin or natural oil.

[0011] Furthermore, the catalyst used in the hydrosilylation reaction is chloroplatinic acid or Karstedt platinum catalyst, and the concentration used is 0.5-10 ppm.

[0012] The present application also provides a method for preparing a hydrophilic modified silicone elastomer with moisturizing properties, comprising the following steps:

[0013] (1) Place a polysiloxane containing at least 3 Si-H units in the molecule, a hyaluronic acid-modified single-end vinyl polysiloxane, a polyethylene glycol-modified vinyl polysiloxane, a portion of a carrier fluid, and a catalyst for hydrosilylation in a clean stirred tank, introduce N2 throughout the process, and stir to react;

[0014] (2) After the reaction in step (1) is completed, the divinyl-terminated polysiloxane and the remaining carrier fluid are added to the stirred tank and the reaction is continued at a constant temperature;

[0015] (3) After the reaction is completed, cool to a certain temperature and continue stirring to obtain a silicone elastomer.

[0016] Furthermore, in step (1), the partial carrier fluid accounts for 30%-70% of the total carrier fluid, the stirring speed is 10-80 rpm / min, the reaction temperature is 50-120°C, and the reaction time is 0.5-1.5 h; in step (2), the constant temperature reaction time is continued for 2-5 h; in step (3), the gel is cooled to 25-35°C and the stirring time is 0.5-1 h.

[0017] The beneficial effects of the present invention are as follows:

[0018] (1) The present invention hydrophilically modifies silicone elastomers by introducing hyaluronic acid segments and polyethylene glycol segments, thereby enhancing their moisturizing properties. This allows them to effectively enhance the skin's moisturizing effect and reduce dryness and tightness in cosmetic applications. The modified elastomer has good self-emulsifying properties and can easily form a stable gel system in water-based or water-containing formulations, simplifying the emulsification process and improving the applicability and stability of the formulation.

[0019] (2) The silicone elastomer of the present invention exhibits excellent compatibility and can be well compatible with a variety of common cosmetic ingredients such as esters, fatty alcohols, silicone oils and some sunscreens, avoiding the problems of precipitation and stratification that are prone to occur with traditional silicone elastomers, and helping to improve the overall stability and user experience of the final product.

[0020] (3) By optimizing the cross-linking degree and preparation process, the present invention further improves the absorption performance of the elastomer, making it easier to spread and absorb on the skin, leaving the skin feeling delicate, silky, and non-greasy. The material preparation process is simple, the conditions are mild, and it is easy to scale up production, providing a new material foundation for the development of more functional and comfortable personal care products. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below through examples. However, it should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concept of the present invention.

[0022] The following is further described by specific examples:

[0023] Example 1:

[0024] A hydrophilic-modified silicone elastomer with moisturizing properties is prepared using a platinum catalyst using the following components, calculated by mass percentage: 3.75% hydrogenated silicone oil, 0.5% hyaluronic acid-modified vinyl silicone oil, 0.5% polyethylene glycol-modified silicone oil, 83.98% polydimethylsiloxane (5 cst), 11.25% bifunctional vinyl silicone oil, and 0.02% platinum catalyst. The preparation method is as follows: the hydrogenated silicone oil, hyaluronic acid-modified vinyl silicone oil, polyethylene glycol-modified silicone oil, half of the required amount of polydimethylsiloxane (5 cst), and the platinum catalyst are weighed into a stirred tank and reacted at 80°C at 30 rpm for 45 minutes. After the reaction is complete, the bifunctional vinyl silicone oil and the remaining polydimethylsiloxane (5 cst) are added, the speed is increased to 50 rpm, and the reaction is continued at 80°C for 2.5 hours. After the reaction is completed, the temperature of the stirring kettle is lowered to 35°C and stirring is continued for 30 minutes to obtain the silicone elastomer gel. The entire reaction is carried out under N2 protection.

[0025] Example 2:

[0026] A hydrophilic-modified silicone elastomer with moisturizing properties is prepared using a platinum catalyst using the following components, calculated by mass percentage: 3.75% hydrogenated silicone oil, 0.8% hyaluronic acid-modified vinyl silicone oil, 0.5% polyethylene glycol-modified silicone oil, 83.98% polydimethylsiloxane (5 cst), 10.95% bifunctional vinyl silicone oil, and 0.02% platinum catalyst. The preparation method is as follows: the hydrogenated silicone oil, hyaluronic acid-modified vinyl silicone oil, polyethylene glycol-modified silicone oil, half the required amount of polydimethylsiloxane (5 cst), and the platinum catalyst are weighed into a stirred tank and reacted at 80°C at 30 rpm for 45 minutes. After the reaction is complete, the bifunctional vinyl silicone oil and the remaining polydimethylsiloxane (5 cst) are added, the speed is increased to 50 rpm, and the reaction is continued at 80°C for 2.5 hours. After the reaction is completed, the temperature of the stirring kettle is lowered to 35°C and stirring is continued for 30 minutes to obtain the silicone elastomer gel. The entire reaction is carried out under N2 protection.

[0027] Example 3:

[0028] A hydrophilic-modified silicone elastomer with moisturizing properties is prepared using a platinum catalyst using the following components, calculated by mass percentage: 3.75% hydrogenated silicone oil, 0.5% hyaluronic acid-modified vinyl silicone oil, 0.8% polyethylene glycol-modified silicone oil, 83.98% polydimethylsiloxane (5 cst), 10.95% bifunctional vinyl silicone oil, and 0.02% platinum catalyst. The preparation method is as follows: the hydrogenated silicone oil, hyaluronic acid-modified vinyl silicone oil, polyethylene glycol-modified silicone oil, half of the required amount of polydimethylsiloxane (5 cst), and the platinum catalyst are weighed into a stirred tank and reacted at 80°C at 30 rpm for 45 minutes. After the reaction is complete, the bifunctional vinyl silicone oil and the remaining polydimethylsiloxane (5 cst) are added, the speed is increased to 50 rpm, and the reaction is continued at 80°C for 2.5 hours. After the reaction is completed, the temperature of the stirring kettle is lowered to 35°C and stirring is continued for 30 minutes to obtain the silicone elastomer gel. The entire reaction is carried out under N2 protection.

[0029] Example 4:

[0030] A hydrophilic-modified silicone elastomer with moisturizing properties is prepared using a platinum catalyst using the following components, calculated by mass percentage: 3.75% hydrogenated silicone oil, 0.8% hyaluronic acid-modified vinyl silicone oil, 0.8% polyethylene glycol-modified silicone oil, 83.98% polydimethylsiloxane (5 cst), 10.65% bifunctional vinyl silicone oil, and 0.02% platinum catalyst. The preparation method is as follows: the hydrogenated silicone oil, hyaluronic acid-modified vinyl silicone oil, polyethylene glycol-modified silicone oil, half of the required amount of polydimethylsiloxane (5 cst), and the platinum catalyst are weighed into a stirred tank and reacted at 80°C at 30 rpm for 45 minutes. After the reaction is complete, the bifunctional vinyl silicone oil and the remaining polydimethylsiloxane (5 cst) are added, the speed is increased to 50 rpm, and the reaction is continued at 80°C for 2.5 hours. After the reaction is completed, the temperature of the stirring kettle is lowered to 35°C and stirring is continued for 30 minutes to obtain the silicone elastomer gel. The entire reaction is carried out under N2 protection.

[0031] Example 5:

[0032] A hydrophilic-modified silicone elastomer with moisturizing properties is prepared using a platinum catalyst using the following components, calculated by mass percentage: 3.75% hydrogenated silicone oil, 0.5% hyaluronic acid-modified vinyl silicone oil, 0.5% polyethylene glycol-modified silicone oil, 82.48% polydimethylsiloxane (5 cst), 12.75% bifunctional vinyl silicone oil, and 0.02% platinum catalyst. The preparation method is as follows: the hydrogenated silicone oil, hyaluronic acid-modified vinyl silicone oil, polyethylene glycol-modified silicone oil, half of the required amount of polydimethylsiloxane (5 cst), and the platinum catalyst are weighed into a stirred tank and reacted at 80°C at 30 rpm for 45 minutes. After the reaction is complete, the bifunctional vinyl silicone oil and the remaining polydimethylsiloxane (5 cst) are added, the speed is increased to 50 rpm, and the reaction is continued at 80°C for 2.5 hours. After the reaction is completed, the temperature of the stirring kettle is lowered to 35°C and stirring is continued for 30 minutes to obtain the silicone elastomer gel. The entire reaction is carried out under N2 protection.

[0033] Example 6:

[0034] A hydrophilic-modified silicone elastomer with moisturizing properties is prepared using a platinum catalyst using the following components, calculated by mass percentage: 3.75% hydrogenated silicone oil, 0.5% hyaluronic acid-modified vinyl silicone oil, 0.5% polyethylene glycol-modified silicone oil, 80.98% polydimethylsiloxane (5 cst), 14.25% bifunctional vinyl silicone oil, and 0.02% platinum catalyst. The preparation method is as follows: the hydrogenated silicone oil, hyaluronic acid-modified vinyl silicone oil, polyethylene glycol-modified silicone oil, half of the required amount of polydimethylsiloxane (5 cst), and the platinum catalyst are weighed into a stirred tank and reacted at 80°C at 30 rpm for 45 minutes. After the reaction is complete, the bifunctional vinyl silicone oil and the remaining polydimethylsiloxane (5 cst) are added, the speed is increased to 50 rpm, and the reaction is continued at 80°C for 2.5 hours. After the reaction is completed, the temperature of the stirring kettle is lowered to 35°C and stirring is continued for 30 minutes to obtain the silicone elastomer gel. The entire reaction is carried out under N2 protection.

[0035] Comparative Example 1:

[0036] A hydrophilic-modified silicone elastomer with moisturizing properties is prepared using a platinum catalyst using the following components, calculated by mass percentage, as follows: 3.75% hydrogenated silicone oil, 0.5% polyethylene glycol-modified silicone oil, 83.98% polydimethylsiloxane (5 cst), 11.75% bi-terminal vinyl silicone oil, and 0.02% platinum catalyst. The preparation method is as follows: the hydrogenated silicone oil, hyaluronic acid-modified vinyl silicone oil, polyethylene glycol-modified silicone oil, half of the required amount of polydimethylsiloxane (5 cst), and the platinum catalyst are weighed and placed in a stirred tank. The mixture is then stirred at 30 rpm and 80°C for 45 minutes. After the reaction is complete, the bi-terminal vinyl silicone oil and the remaining polydimethylsiloxane (5 cst) are added, the speed is increased to 50 rpm, and the reaction is continued at 80°C for 2.5 hours. After the reaction is complete, the temperature of the stirred tank is lowered to 35°C, and stirring is continued for 30 minutes to obtain a silicone elastomer gel. The entire reaction was carried out under N2 protection.

[0037] Comparative Example 2:

[0038] A hydrophilic-modified silicone elastomer with moisturizing properties is prepared using a platinum catalyst using the following components, calculated by mass percentage, under the action of a platinum catalyst: 3.75% hydrogenated silicone oil, 0.5% hyaluronic acid-modified vinyl silicone oil, 83.98% polydimethylsiloxane (5 cst), 11.75% bi-terminal vinyl silicone oil, and 0.02% platinum catalyst. The specific preparation method is as follows: the hydrogenated silicone oil, hyaluronic acid-modified vinyl silicone oil, polyethylene glycol-modified silicone oil, half of the required amount of polydimethylsiloxane (5 cst), and the platinum catalyst are weighed and placed in a stirred tank. The mixture is then stirred at 30 rpm and 80°C for 45 minutes. After the reaction is complete, the bi-terminal vinyl silicone oil and the remaining polydimethylsiloxane (5 cst) are added, the speed is increased to 50 rpm, and the reaction is continued at 80°C for 2.5 hours. After the reaction is complete, the temperature of the stirred tank is lowered to 35°C, and stirring is continued for 30 minutes to obtain a silicone elastomer gel. The entire reaction was carried out under N2 protection.

[0039] Comparative Example 3:

[0040] A hydrophilic-modified silicone elastomer with moisturizing properties is prepared using a platinum catalyst using the following components, calculated by mass percentage, as follows: 3.75% hydrogenated silicone oil, 83.98% polydimethylsiloxane (5 cst), 12.25% bivalent-terminated silicone oil, and 0.02% platinum catalyst. The preparation method is as follows: hydrogenated silicone oil, hyaluronic acid-modified vinyl silicone oil, polyethylene glycol-modified silicone oil, half the required amount of polydimethylsiloxane (5 cst), and platinum catalyst are weighed and placed in a stirred tank. The mixture is then stirred at 30 rpm and 80°C for 45 minutes. After the reaction is complete, the bivalent-terminated silicone oil and the remaining polydimethylsiloxane (5 cst) are added, the speed is increased to 50 rpm, and the reaction is continued at 80°C for 2.5 hours. After the reaction is complete, the temperature of the stirred tank is lowered to 35°C, and stirring is continued for 30 minutes to obtain a silicone elastomer gel. The entire reaction is carried out under nitrogen protection.

[0041] The above examples and comparative examples were subjected to stability inspection and application performance evaluation, and the results are shown in Table 1.

[0042] Table 1 is a table showing the stability test results of Examples 1 to 6 and Comparative Examples 1 to 3.

[0043]

[0044] Stability testing results show that the formulated silicone elastomers exhibited excellent stability, with no oil separation or caking observed during testing, maintaining a uniform, viscous gel state. Furthermore, a comparison of Example 1 with Examples 5 and 6 reveals that despite the increased crosslinking degree of the elastomer gel, stability remains excellent, demonstrating the excellent stability of the silicone elastomer preparation process.

[0045] Application performance evaluation:

[0046] 1. Compatibility test.

[0047] Common daily chemical formula raw materials with different properties were mixed with the silicone elastomer of the present invention in ratios of 1:9 and 1:3. After standing for 24 hours, their compatibility with common cosmetic ingredients was observed. The results are shown in Table 2.

[0048] Table 2 shows the compatibility test results of daily chemical formula raw materials with different properties and the silicone elastomers prepared in Examples 1 to 3.

[0049]

[0050] Note: Compatible is C, partially compatible is PC, incompatible is NC

[0051] The results show that the introduction of polyethylene glycol segments significantly improves the compatibility of silicone elastomer gels with certain cosmetic ingredients, which also ensures the stability of the formula during subsequent use.

[0052] 2. Moisturizing test.

[0053] The moisturizing properties of a product can typically be assessed by measuring the rate of water loss from the skin's surface. A transepidermal water loss meter is a fully portable instrument used to measure transepidermal water loss (TEWL) and evaporation rates. This test involved 15 volunteers in a test room maintained at a constant temperature of 20°C and a constant humidity of 50%. Three 3x3 cm square areas on the inner arms were used as test areas. After rinsing with clean water and allowing the area to rest for 30 minutes, an initial measurement was taken. 0.2 g of the elastomer gel sample was then evenly applied to the test area, and the measurement was repeated 30 minutes later. The moisture gain rate is expressed as the ratio of the difference between the pre- and post-test results to the value obtained before sample application. The final results are shown in the table.

[0054] Table 3 is a table of moisturizing test results for Example 1, Example 2, Example 4, Comparative Example 1 and Comparative Example 3.

[0055]

[0056] As can be seen from the table, after the introduction of hyaluronic acid segments, the moisture content has increased significantly (Example 1 and Comparative Example 1), indicating that the introduction of hyaluronic acid does improve the moisturizing properties of the silicone elastomer. In addition, by comparing Example 1 and Example 2, it can be seen that appropriately increasing the proportion of hyaluronic acid segments introduced can enhance the moisturizing properties of the prepared silicone elastomer to a certain extent.

[0057] 3. Absorption performance and skin feel test.

[0058] In order to test the improvement of the absorption performance of the prepared silicone elastomer after adjusting the process, Example 1, Example 5 and Example 6 were applied to an essence, and the formula is shown in Table 4.

[0059] Table 4 is a formula composition table of applying the silicone elastomers prepared in Example 1, Example 5 and Example 6 to an essence.

[0060]

[0061] To ensure the accuracy of the experimental results, each formulated formula was distributed to 15 test volunteers. Approximately 0.025g of the applied formula sample was weighed and applied to an area of ​​equal size on their arm. The sample was evenly applied in a circular motion. After a certain number of circles, the resistance to application increased. The number of circles at this point was recorded as a reference for absorption speed. The evaluation criteria were: Fewer circles indicate faster absorption; more circles indicate slower absorption. The test was as follows: Using Formula 1 as the standard, 11 participants found Formula 2 to be faster, while 8 participants found Formula 3 to be faster. This indicates that increasing the degree of cross-linking improves the absorption of the elastomer sample, but a higher degree of cross-linking is not necessarily better. This suggests that optimal absorption performance is achieved only when the degree of cross-linking is appropriately increased.

[0062] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are included within the scope of protection of the present invention.

Claims

1. A hydrophilic modified silicone elastomer with moisturizing properties, characterized in that: Includes the following components: Polysiloxanes containing at least 3 Si-H units in the molecule; bisvinyl terminated polysiloxane; Hyaluronic acid-modified single-end vinyl polysiloxane; Polyethylene glycol-modified vinyl polysiloxane; carrier fluid; Platinum metal catalyst used in hydrosilylation.

2. The hydrophilic modified silicone elastomer with moisturizing properties according to claim 1, characterized in that: The weight percentages of each component are: 2-6% polysiloxanes containing at least 3 Si-H units in the molecule; Hyaluronic acid modified monovinyl polysiloxane 2-1.2%; Polyethylene glycol-modified vinyl polysiloxane 2-1.2%; 8-18% bisvinyl terminated polysiloxane; Carrier fluid 75-90%; Platinum catalyst 0.05-0.1%.

3. The hydrophilic modified silicone elastomer with moisturizing properties according to claim 1, characterized in that: The polysiloxane containing at least three Si-H units in the molecule is a polysiloxane containing at least three Si-H groups in the side chain, wherein the ratio of the amount of D segments to the amount of D' segments in the segment is 5-20, the weight percentage of H in the Si-H group in the molecule is 0.05%-0.5%, and the molecular weight is 1000-20000.

4. The hydrophilic modified silicone elastomer with moisturizing properties according to claim 1, characterized in that: The divinyl-terminated polysiloxane has a vinyl content of 0.15%-5%, a polymerization degree of 10-500, and a molecular weight of 1000-20000.

5. The hydrophilic modified silicone elastomer with moisturizing properties according to claim 1, characterized in that: The hyaluronic acid-modified single-end vinyl polysiloxane is prepared by the following method: unmodified low-molecular-weight hyaluronic acid is reacted with dimethylvinylethoxysilane under the action of an organic titanium catalyst to form a single-end vinyl-modified hyaluronic acid derivative.

6. The hydrophilic modified silicone elastomer with moisturizing properties according to claim 1, characterized in that: The polyethylene glycol-modified vinyl polysiloxane is a single-end vinyl polysiloxane, wherein the vinyl content is 0.1%-0.6% and the polyethylene glycol repeating unit is 8-25.

7. The hydrophilic modified silicone elastomer with moisturizing properties according to claim 1, characterized in that: The carrier fluid is selected from one or more of low-viscosity polydimethylsiloxane with a viscosity of 1-50 mPa·s, decamethylcyclopentasiloxane, isoparaffin, or natural oils and fats.

8. The hydrophilic modified silicone elastomer with moisturizing properties according to claim 1, characterized in that: The catalyst used in the hydrosilylation reaction is chloroplatinic acid or Karstedt platinum catalyst, and the concentration used is 0.5-10 ppm.

9. A method for preparing a hydrophilically modified silicone elastomer with moisturizing properties according to any one of claims 1 to 8, characterized in that: The steps include: (1) Place a polysiloxane containing at least 3 Si-H units in the molecule, a hyaluronic acid-modified single-end vinyl polysiloxane, a polyethylene glycol-modified vinyl polysiloxane, a portion of a carrier fluid, and a catalyst for hydrosilylation in a clean stirred tank, introduce N2 throughout the process, and stir to react; (2) After the reaction in step (1) is completed, the divinyl-terminated polysiloxane and the remaining carrier fluid are added to the stirred tank and the reaction is continued at a constant temperature; (3) After the reaction is completed, cool to a certain temperature and continue stirring to obtain a silicone elastomer.

10. The method for preparing a hydrophilically modified silicone elastomer with moisturizing properties according to claim 9, characterized in that: In step (1), the partial carrier fluid accounts for 30%-70% of the total carrier fluid, the stirring speed is 10-80 rpm / min, the reaction temperature is 50-120°C, and the reaction time is 0.5-1.5h; The time for continuing the constant temperature reaction in step (2) is 2-5 hours; In step (3), the gel is cooled to 25-35°C and stirred for 0.5-1h.

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