A silicone elastomer, a method for producing the same, a cosmetic product, and a use thereof

Abstract

The application belongs to the field of new materials, and discloses a kind of organic silicon elastomer, which is mainly prepared from hydrogen-containing silicone oil and double-end vinyl silicone oil, wherein the molecular weight of the double-end vinyl silicone oil is 4000-42500.The organic silicon elastomer is crosslinked by using double-end vinyl silicone oil to treat hydrogen-containing silicone oil, and the light transmittance of the elastomer is improved by controlling the chain length of the double-end vinyl silicone oil.The application also provides a preparation method of the elastomer, daily chemical products containing the elastomer, and the use of the elastomer.

Description

Technical Field

[0001] This invention belongs to the field of new materials, specifically relating to an organosilicon elastomer, its preparation method, daily chemical products, and applications. Background Technology

[0002] Silicone elastomer gels, as a skin feel modifier, are widely used in personal care products.

[0003] With consumers increasingly pursuing "pure beauty" and environmentally friendly practices, the market and cosmetic companies desire silicone elastomer gels that offer higher transparency while maintaining their original thickening and skin-feeling properties. High transparency significantly improves the appearance of pure oil-based formulations (such as solid perfumes) containing silicone elastomer gels (70% or more), providing consumers with a better visual and user experience. Currently, achieving high transparency in silicone elastomer gels with low cross-linking density is relatively simple. However, such products suffer from poor thickening properties due to low cross-linking density, resulting in an oily, sticky, and powdery feel that is difficult to use. Therefore, to achieve better thickening and skin feel, most commercially available silicone elastomer gels have to sacrifice transparency. High-transparency silicone elastomer gels (liquid) are often used as stringy silicone oils due to their relatively poor thickening ability.

[0004] Therefore, the problem this project addresses is: how to improve the light transmittance of silicone elastomers. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an organosilicon elastomer that uses a dual-end vinyl silicone oil to crosslink a hydrogen-containing silicone oil, thereby improving light transmittance by controlling the chain length of the dual-end vinyl silicone oil.

[0006] In a further preferred embodiment of the present invention, the obtained silicone elastomer maintains a good powdery feel while improving light transmittance.

[0007] The present invention also provides a method for preparing the elastomer, a daily chemical product containing the elastomer, and the uses of the elastomer.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] An organosilicon elastomer is mainly made of hydrogen-containing silicone oil and dual-terminated vinyl silicone oil, wherein the molecular weight of the dual-terminated vinyl silicone oil is 4000-42500.

[0010] This invention improves transparency by increasing the chain length of the crosslinking agent, the double-ended vinyl silicone oil, thereby increasing the mesh size of the three-dimensional crosslinking network structure and reducing the crosslinking density.

[0011] Preferably, the molar ratio of the silicon-hydrogen bonds in the hydrogen-containing silicone oil to the olefin bonds in the double-ended vinyl silicone oil is 0.8 to 1.2:1; and / or, the hydrogen content of the hydrogen-containing silicone oil is 0.10 wt% to 0.61 wt%; and / or, the molecular weight of the hydrogen-containing silicone oil is 1300 to 22000; and / or, the vinyl content of the double-ended vinyl silicone oil is 0.15% to 1.4%.

[0012] In some embodiments of the present invention, the vinyl content of the dual-terminated vinyl silicone oil is 0.15%, 0.20%, 0.3%, 0.40%, 0.5%, 0.60%, 0.70%, 0.80%, 0.90%, 1.00%, 1.10%, 1.20%, 1.30%, or 1.40%.

[0013] Generally, it is recommended that the molar ratio of silane bonds in hydrosilicone oil to olefin bonds in double-ended vinyl silicone oil be around 0.8 to 1.2:1. If there are too many silane bonds in the hydrosilicone oil, it will lead to an increase in cross-linking disorder, with some positions being densely cross-linked and others sparsely cross-linked, which will have a negative effect on improving light transmittance. On the other hand, if there are too few silane bonds in the hydrosilicone oil, it will lead to insufficient cross-linking, which will weaken the powdery feel and gel viscosity after application to the skin.

[0014] The hydrogen content and molecular weight of the hydrogen-containing silicone oil of this invention also affect the product performance. If the hydrogen content is too low and the molecular weight is too high, the cross-linking sites will be too sparse, which is detrimental to properties such as gel viscosity and powdery feel. If the hydrogen content is too high and the molecular weight is too low, the cross-linking density will be too high, causing the gel to become a hard block and have no use value. Based on the above analysis, it can be further inferred that the molecular weight and hydrogen content of the hydrogen-containing silicone oil are actually two related parameters that jointly determine the density of cross-linking sites, thereby affecting the performance.

[0015] In some embodiments of the present invention, the hydrogen content of the hydrogen-containing silicone oil is 0.10wt%, 0.15wt%, 0.20wt%, 0.25wt%, 0.30wt%, 0.35wt%, 0.4wt%, 0.45wt%, 0.50wt%, or 0.61wt%.

[0016] In some embodiments of the present invention, the molecular weight of the hydrogen-containing silicone oil is 1300, 1500, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000, 11000, 12000, 13000, 14000, 15000, 17000, 19000, or 22000;

[0017] In some embodiments of the present invention, the molecular weight of the dual-terminated vinyl silicone oil is 4000, 5000, 6000, 7000, 8000, 9000, 10000, 11000, 12000, 13000, 14000, 15000, 16000, 17000, 18000, 19000, 20000, 21000, 22000, 23000, 24000, 25000, 26000, 27000, 28000, 29000, 30000, 35000, 40000, or 42500;

[0018] In some embodiments of the present invention, the molar ratio of the silane-hydrogen bonds of the hydrogen-containing silicone oil to the olefin bonds of the double-ended vinyl silicone oil is 0.8:1, 0.85:1, 0.9:1, 0.95:1, 1.0:1, 1.05:1, 1.1:1 or 1.2:1.

[0019] During the experiment, the molar ratio of the silane-hydrogen bonds in hydrogen-containing silicone oil to the olefin bonds in double-ended vinyl silicone oil exceeding the above range does not necessarily preclude the production of products with certain properties. By controlling other process conditions, molar ratios exceeding the range can still be achieved under certain conditions, although the utilization rate and economy are poor when the ratio is too high or too low.

[0020] As a further preferred embodiment of the present invention, the hydrogen content of the hydrogen-containing silicone oil is 0.10wt% to 0.51wt%; the molecular weight of the hydrogen-containing silicone oil is 1900 to 15100; and the molecular weight of the double-ended vinyl silicone oil is 4000 to 32000.

[0021] In the above-mentioned organosilicon elastomers, the structural formula of the hydrogen-containing silicone oil is:

[0022]

[0023] m = 23 to 125; n = 2 to 75.

[0024] In some embodiments of the present invention, m is 23, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 120 or 125;

[0025] In some embodiments of the present invention, n is 2, 5, 10, 15, 20, 25, 30, 30, 40, 45, 50, 60, 70 or 75;

[0026] In the above-mentioned organosilicon elastomers, the hydrogen-containing silicone oil is mainly composed of a capping agent, a first reactant, and a second reactant;

[0027] Wherein, the mass ratio of the first reactant, the second reactant, and the capping agent is 250–360:40–138:5.4–31, and / or, the capping agent is hexamethyldisiloxane and / or low-viscosity polydimethylsiloxane, wherein the viscosity range of the low-viscosity polydimethylsiloxane is 2.0–10.0 cSt, and / or, the first reactant is one or more combinations of octamethylcyclotetrasiloxane, hexamethylcyclotrisiloxane, decamethylcyclopentasiloxane, and dodecylcyclohexasiloxane, and / or, the second reactant is 1,3,5,7-tetramethylcyclotetrasiloxane and / or fully hydrogen-containing silicone oil.

[0028] In some embodiments of the present invention, the viscosity of the low-viscosity polydimethylsiloxane is 2cSt, 3cSt, 4cSt, 5cSt, 6cSt, 7cSt, 8cSt, 9cSt, or 10cSt.

[0029] In the aforementioned organosilicon elastomer, the dual-terminated vinyl silicone oil is mainly composed of a third reactant and a fourth reactant; wherein the molar ratio of the third reactant to the fourth reactant is 1:8 to 14, and / or the third reactant is 1,3-divinyltetramethyldisiloxane and / or a low-viscosity dual-terminated vinyl silicone oil, wherein the viscosity range of the low-viscosity dual-terminated vinyl silicone oil is 3.0 to 10.0 cSt, and / or the fourth reactant is one or more combinations of octamethylcyclotetrasiloxane, hexamethylcyclotrisiloxane, decamethylcyclopentasiloxane, and dodecylcyclohexasiloxane.

[0030] In some embodiments of the present invention, the molar ratio of the third reactant to the fourth reactant is 1:8, 1:9, 1:10, 1:11, 1:12, 1:13 or 1:14.

[0031] Preferably, the hydrogen-containing silicone oil and the double-ended vinyl silicone oil do not contain light components, which are oligomers of unreacted monomers and / or volatile monomers.

[0032] Meanwhile, the present invention also discloses a method for preparing the above-mentioned organosilicon elastomer, wherein the method specifically comprises: mixing a solvent, a hydrogen-containing silicone oil, a double-ended vinyl silicone oil, and a platinum catalyst, and reacting the mixture at 70-90°C for 6-10 hours to prepare the organosilicon elastomer.

[0033] In some embodiments of the present invention, the reaction time required for hydrogen-containing silicone oil and dual-terminated vinyl silicone oil in the presence of a platinum catalyst is 6h, 7h, 8h, 9h or 10h.

[0034] In some embodiments of the present invention, the temperature required for reacting hydrogen-containing silicone oil and dual-terminated vinyl silicone oil in the presence of a platinum catalyst is 70°C, 75°C, 80°C, 85°C or 90°C.

[0035] Preferably, the preparation process of the hydrogen-containing silicone oil and the double-ended vinyl silicone oil is as follows: the required reactants are mixed with an acidic catalyst and reacted at 40-50°C for 6-10 hours, and then the acidic catalyst is neutralized to obtain the corresponding hydrogen-containing silicone oil or double-ended vinyl silicone oil.

[0036] In this invention, the acidic catalyst may be selected from phosphoric acid, concentrated sulfuric acid, trifluoromethanesulfonic acid, acidic clay, acidic resin, etc., with concentrated sulfuric acid having a concentration of 98 wt% being preferred.

[0037] In the above-mentioned method for preparing organosilicon elastomers, the solvent is polydimethylsiloxane, and the viscosity of the polydimethylsiloxane is 1.5 to 20 cSt.

[0038] In some embodiments of the present invention, the viscosity of the polydimethylsiloxane is 1.5 cSt, 2 cSt, 3 cSt, 4 cSt, 5 cSt, 6 cSt, 7 cSt, 8 cSt, 9 cSt, 10 cSt, 11 cSt, 12 cSt, 13 cSt, 14 cSt, 15 cSt, 17 cSt, 19 cSt or 20 cSt;

[0039] The total weight of hydrogen-containing silicone oil and double-terminated vinyl silicone oil accounts for 10% to 100% of the total weight of the entire reaction system;

[0040] Preferably, the total weight of hydrogen-containing silicone oil and double-terminated vinyl silicone oil accounts for 10-80% of the total weight of the entire reaction system; more preferably, it is 20-35%.

[0041] In some embodiments of the present invention, the total weight of hydrogen-containing silicone oil and double-ended vinyl silicone oil accounts for 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% of the total weight of the entire reaction system.

[0042] The platinum catalyst is an isopropanol solution of chloroplatinic acid or a vinylplatinum complex;

[0043] The amount of platinum catalyst used is such that the concentration of platinum in the system reaches 1.5 to 10 ppm.

[0044] Preferably, the hydrogen-containing silicone oil and the double-ended vinyl silicone oil are both purified by vacuum distillation to remove light components.

[0045] The light components include, but are not limited to: octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecylcyclohexasiloxane, linear polydimethylsiloxane oligomers, linear divinyl-terminated polydimethylsiloxane oligomers, linear polymethylhydrosiloxane oligomers, etc.

[0046] The presence of light components can significantly affect light transmittance and slightly affect skin feel.

[0047] In some embodiments of the present invention, the amount of platinum catalyst used is such that the concentration of metallic platinum in the system reaches 2ppm, 3ppm, 4ppm, 5ppm, 6ppm, 7ppm, 8ppm, 9ppm or 10ppm.

[0048] In practical applications, too low a concentration of platinum catalyst will result in poor reaction rate and excessively long reaction time; too high a concentration of platinum catalyst will result in yellowing of the product and poor color. The present invention preferably uses a concentration of 4 ppm.

[0049] As a further preferred embodiment of the present invention, the preparation of the organosilicon elastomer gel is also included: the organosilicon elastomer product is sheared and pulverized, then diluted and swollen with the solvent polydimethylsiloxane, and then the gel is obtained by centrifugation or vacuum degassing. The viscosity of the polydimethylsiloxane used in the preparation of the organosilicon elastomer gel is 1.5–20 cSt;

[0050] Finally, the present invention also discloses a daily chemical product containing the organosilicon elastomer described above.

[0051] The aforementioned silicone elastomers are used as skin feel modifiers or thickeners.

[0052] In daily chemical products, the organosilicon elastomer of the present invention is generally recommended to be added to products in dosage forms such as emulsions, oils, and gels;

[0053] The daily chemical products mentioned in this invention include, but are not limited to: face cream, sunscreen, lip gloss, perfume, foundation, lipstick, body lotion, etc.

[0054] The recommended addition amount of the silicone elastomer of the present invention in daily chemical products is 1 to 90 wt%; preferably 1 to 50 wt%, more preferably 1 to 10 wt%. When used as a skin feel modifier, it is recommended to adjust the elastomer concentration to 1 to 90 wt%; preferably 1 to 50 wt%, more preferably 1 to 10 wt%.

[0055] When used as a thickener, further dilution is required, and it is recommended to adjust the elastomer concentration to 1-90 wt%; preferably 1-50 wt%, more preferably 1-10 wt%.

[0056] In practice, in the above applications, since the amount of silicone elastomer used in the formulation is not fixed, the formulation engineer can adjust it according to requirements.

[0057] When adjusting the concentration, solvents such as silicone oil, alkane, and vegetable oil are used.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] This invention uses double-ended vinyl silicone oil as a crosslinking agent. By increasing the chain length of the double-ended vinyl silicone oil, the mesh of the three-dimensional crosslinking network structure is increased, the density of chemical crosslinking sites is reduced, and the transparency is improved. At the same time, the longer chain length helps to increase physical entanglement, resulting in a stronger powdery feel. Thus, high transparency of the gel is achieved while maintaining a good powdery and velvety feel.

[0060] Compared with existing technologies, the process is simple and the cost is low. The resulting gel has improved light transmittance while having a good powdery feel. Detailed Implementation

[0061] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0062] Example 1

[0063] Preparation of hydrogen-containing silicone oil 1

[0064] 360g of octamethylcyclotetrasiloxane, 40g of 1,3,5,7-tetramethylcyclotetrasiloxane, 15g of hexamethyldisiloxane, and 13.3g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 21.5g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170°C and -0.095kPa for 6 hours to obtain hydrogen-containing silicone oil 1 (component A). The hydrogen content was analyzed to be 0.15%, and the number average molecular weight was 3152.

[0065] The low-boiling-point substances described in this embodiment are unreacted monomers and oligomers formed by the reaction of the aforementioned monomers that are volatile under reduced pressure.

[0066] Preparation of double-terminated vinyl silicone oil 1

[0067] 292.5g of octamethylcyclotetrasiloxane, 16.8g of 1,3-divinyltetramethyldisiloxane, and 9.9g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 16.1g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. The liquid was then subjected to reduced pressure distillation at 150-170°C and -0.095kPa for 6 hours to remove low-boiling substances, yielding dual-end vinyl silicone oil 1 (component B). Analysis showed that its vinyl content was 1.32% and its number average molecular weight was 4452.

[0068] Preparation of Organosilicon Elastomer Gel 1

[0069] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 10g of hydrogen-containing silicone oil 1 and 30.7g of double-ended vinyl silicone oil 1 evenly; then add 75.6g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0070] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent gel was obtained, with a light transmittance of 93.2%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 4 points.

[0071] Example 2

[0072] Preparation of double-terminated vinyl silicone oil 2

[0073] 292.5g of octamethylcyclotetrasiloxane, 8.8g of 1,3-divinyltetramethyldisiloxane, and 10g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 16.2g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. The liquid was then subjected to reduced pressure distillation at 150-170°C and -0.095kPa for 6 hours to remove low-boiling substances, yielding dual-end vinyl silicone oil 2 (component B). Analysis showed that its vinyl content was 0.65% and its number average molecular weight was 8391.

[0074] Preparation of Organosilicon Elastomer Gel 2

[0075] Maintaining a 1:1 ratio of silane bonds to double bonds, firstly, 6.2g of hydrogen-containing silicone oil 1 obtained in Example 1 and 38.6g of double-terminated vinyl silicone oil 2 were mixed evenly; then, 83.2g of polydimethylsiloxane (viscosity 5cSt) was added to adjust the elastomer content (IEC) in the initial gel to 35%; finally, a vinyl platinum complex catalyst was added to the system to make the concentration of metallic platinum in the system 4.0ppm, and after stirring evenly, the mixture was allowed to stand at 80°C for 8 hours.

[0076] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent gel was obtained, with a light transmittance of 94.5%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 4 points.

[0077] Example 3

[0078] Preparation of hydrogen-containing silicone oil 2

[0079] 360g of octamethylcyclotetrasiloxane, 73g of 1,3,5,7-tetramethylcyclotetrasiloxane, 8.8g of hexamethyldisiloxane, and 14.1g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 22.9g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170°C and -0.095kPa for 6 hours to obtain hydrogen-containing silicone oil 2 (component A). The hydrogen content was analyzed to be 0.26%, and the number average molecular weight was 6781.

[0080] Preparation of dual-terminated vinyl silicone oil 3

[0081] 292.5g of octamethylcyclotetrasiloxane, 4.8g of 1,3-divinyltetramethyldisiloxane, and 9.5g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 15.4g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. The liquid was then subjected to reduced pressure distillation at 150-170°C and -0.095kPa for 6 hours to remove low-boiling substances, yielding dual-end vinyl silicone oil 3 (component B). Analysis showed that its vinyl content was 0.34% and its number average molecular weight was 16318.

[0082] Preparation of Organosilicon Elastomer Gel 3

[0083] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 3.8g of hydrogen-containing silicone oil 2 and 78.5g of double-terminated vinyl silicone oil 3 evenly; then add 152.8g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0084] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent gel was obtained, with a light transmittance of 95.1%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 4 points.

[0085] Example 4

[0086] Preparation of double-ended vinyl silicone oil 4

[0087] 292.5g of octamethylcyclotetrasiloxane, 2.9g of 1,3-divinyltetramethyldisiloxane, and 9.4g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 15.3g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. The liquid was then subjected to reduced pressure distillation at 150-170°C and -0.095kPa for 6 hours to remove low-boiling substances, yielding dual-end vinyl silicone oil 4 (component B). Analysis showed that its vinyl content was 0.25% and its number average molecular weight was 22120.

[0088] Preparation of Organosilicon Elastomer Gel 4

[0089] Maintaining a 1:1 ratio of silane bonds to double bonds, firstly, 3.0g of hydrogen-containing silicone oil 2 obtained in Example 3 and 84.2g of double-terminated vinyl silicone oil 4 were mixed evenly; then, 161.9g of polydimethylsiloxane (viscosity 5cSt) was added to adjust the elastomer content (IEC) in the initial gel to 35%; finally, a vinyl platinum complex catalyst was added to the system to make the concentration of metallic platinum in the system 4.0ppm, and after stirring evenly, the mixture was allowed to stand at 80°C for 8 hours.

[0090] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent gel was obtained, with a light transmittance of 95.6%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 4.5.

[0091] Example 5

[0092] Preparation of hydrogen-containing silicone oil 3

[0093] 360g of octamethylcyclotetrasiloxane, 26g of 1,3,5,7-tetramethylcyclotetrasiloxane, 6.6g of hexamethyldisiloxane, and 12.6g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 20.4g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170°C and -0.095kPa for 6 hours to obtain hydrogen-containing silicone oil 3 (component A). The hydrogen content was analyzed to be 0.10%, and the number average molecular weight was 11530.

[0094] Preparation of dual-terminated vinyl silicone oil 5

[0095] 292.5g of octamethylcyclotetrasiloxane, 17.5g of 1,3-divinyltetramethyldisiloxane, and 9.9g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 16.1g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170°C and -0.095kPa for 6 hours to obtain dual-end vinyl silicone oil 5 (component B). The vinyl content was analyzed to be 1.34%, and the number average molecular weight was 4030.

[0096] Preparation of Organosilicon Elastomer Gel 5

[0097] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 16g of hydrogen-containing silicone oil 3 and 32.2g of double-terminated vinyl silicone oil 5 evenly; then add 89.5g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0098] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent gel was obtained, with a light transmittance of 94.8%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 4.5.

[0099] Example 6

[0100] Preparation of hydrogen-containing silicone oil 4

[0101] 260g of octamethylcyclotetrasiloxane, 137.4g of 1,3,5,7-tetramethylcyclotetrasiloxane, 23.7g of hexamethyldisiloxane, and 13.5g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 21.9g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170°C and -0.095kPa for 6 hours to obtain hydrogen-containing silicone oil 4 (component A). The hydrogen content was analyzed to be 0.51%, and the number average molecular weight was 2596.

[0102] Preparation of double-ended vinyl silicone oil 6

[0103] 292.5g of octamethylcyclotetrasiloxane, 2.3g of 1,3-divinyltetramethyldisiloxane, and 9.4g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 15.3g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. The liquid was then subjected to reduced pressure distillation at 150-170°C and -0.095kPa for 6 hours to remove low-boiling substances, yielding dual-end vinyl silicone oil 6 (component B). Analysis showed that its vinyl content was 0.17% and its number average molecular weight was 31817.

[0104] Preparation of Organosilicon Elastomer Gel 6

[0105] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 1g of hydrogen-containing silicone oil 4 and 81g of double-terminated vinyl silicone oil 6 evenly; then add 152.3g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0106] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent gel was obtained, with a light transmittance of 93.1%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 4 points.

[0107] Example 7

[0108] Preparation of hydrogen-containing silicone oil 5

[0109] 250g of octamethylcyclotetrasiloxane, 90g of 1,3,5,7-tetramethylcyclotetrasiloxane, 30.9g of hexamethyldisiloxane, and 11.9g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 19.3g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170°C and -0.095kPa for 6 hours to obtain hydrogen-containing silicone oil 5 (component A). The hydrogen content was analyzed to be 0.38%, and the number average molecular weight was 1921.

[0110] Preparation of Organosilicon Elastomer Gel 7

[0111] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 1.2g of hydrogen-containing silicone oil 4 and 49.2g of the double-terminated vinyl silicone oil 4 from Example 4 evenly; then add 93.6g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80°C for 8 hours to react;

[0112] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent gel was obtained, with a light transmittance of 93.5%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 3.5.

[0113] Example 8

[0114] Preparation of hydrogen-containing silicone oil 6

[0115] 360g of octamethylcyclotetrasiloxane, 34g of 1,3,5,7-tetramethylcyclotetrasiloxane, 5.4g of hexamethyldisiloxane, and 12.8g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 20.8g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170°C and -0.095kPa for 6 hours to obtain hydrogen-containing silicone oil 6 (component A). The hydrogen content was analyzed to be 0.13%, and the number average molecular weight was 15104.

[0116] Preparation of dual-terminated vinyl silicone oil 7

[0117] 292.5g of octamethylcyclotetrasiloxane, 12.4g of 1,3-divinyltetramethyldisiloxane, and 9.8g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 15.9g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170°C and -0.095kPa for 6 hours to obtain dual-end vinyl silicone oil 7 (component B). The vinyl content was analyzed to be 0.84%, and the number average molecular weight was 6684.

[0118] Preparation of Organosilicon Elastomer Gel 8

[0119] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 10g of hydrogen-containing silicone oil 6 and 41.8g of double-terminated vinyl silicone oil 7 evenly; then add 96.2g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0120] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent gel was obtained, with a light transmittance of 94.2%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 4.5.

[0121] Example 9

[0122] Preparation of Organosilicon Elastomer Gel 9

[0123] The ratio of silane bonds to double bonds was adjusted to 1.2:1. First, 3.8g of hydrogen-containing silicone oil 2 obtained in Example 3 and 65.4g of double-terminated vinyl silicone oil 3 obtained in Example 3 were mixed evenly. Then, 128.5g of polydimethylsiloxane (viscosity 5cSt) was added to adjust the elastomer content (IEC) in the initial gel to 35%. Finally, vinyl platinum complex catalyst was added to the system to make the concentration of metallic platinum in the system 4.0ppm. After stirring evenly, the mixture was allowed to stand at 80°C for 8 hours.

[0124] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent gel was obtained, with a light transmittance of 94.7%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 4 points.

[0125] Example 10

[0126] Preparation of Organosilicon Elastomer Gel 10

[0127] The ratio of silane bonds to double bonds was adjusted to 0.8:1. First, 3.8g of hydrogen-containing silicone oil 2 obtained in Example 3 and 94.2g of double-terminated vinyl silicone oil 3 obtained in Example 3 were mixed evenly. Then, 182g of polydimethylsiloxane (viscosity 5cSt) was added to adjust the elastomer content (IEC) in the initial gel to 35%. Finally, vinyl platinum complex catalyst was added to the system to make the concentration of metallic platinum in the system 4.0ppm. After stirring evenly, the mixture was allowed to stand at 80°C for 8 hours.

[0128] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent gel was obtained, with a light transmittance of 95.5%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 3.5.

[0129] Example 11

[0130] Preparation of hydrogen-containing silicone oil 7

[0131] 360g of octamethylcyclotetrasiloxane, 87g of fully hydrogen-containing silicone oil (silicon hydrogen content of 1.57%, viscosity of 20cSt), 9.3g of hexamethyldisiloxane, and 14.6g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45℃ for 8 hours. 23.7g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170℃ and -0.095kPa for 6 hours to obtain hydrogen-containing silicone oil 7 (component A). The hydrogen content was analyzed to be 0.30%, and the number average molecular weight was 5633.

[0132] Preparation of Organosilicon Elastomer Gel 11

[0133] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 3g of hydrogen-containing silicone oil 7 and 71.5g of double-terminated vinyl silicone oil 3 evenly; then add 138.4g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0134] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent gel was obtained, with a light transmittance of 94.7%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 4 points.

[0135] `

[0136] Example 12

[0137] Preparation of dual-terminated vinyl silicone oil 8

[0138] 360g of octamethylcyclotetrasiloxane, 27.9g of dual-end vinyl silicone oil (vinyl content 6.5%, viscosity 5.9cSt) and 12.4g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45℃ for 8 hours. 20.1g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170℃ and -0.095kPa for 6 hours to obtain dual-end vinyl silicone oil 8 (component B). The vinyl content was analyzed to be 0.45% and the number average molecular weight was 12167.

[0139] Preparation of Organosilicon Elastomer Gel 12

[0140] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 5g of hydrogen-containing silicone oil 2 and 78g of double-terminated vinyl silicone oil 8 evenly; then add 154.1g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0141] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent gel was obtained, with a light transmittance of 94.3%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 4 points.

[0142] Example 13

[0143] Preparation of hydrogen-containing silicone oil 8

[0144] 360g of decamethylcyclopentasiloxane, 60g of 1,3,5,7-tetramethylcyclotetrasiloxane, 8.3g of hexamethyldisiloxane, and 13.7g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 22.2g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170°C and -0.095kPa for 6 hours to obtain hydrogen-containing silicone oil 8 (component A). The hydrogen content was analyzed to be 0.22%, and the number average molecular weight was 7105.

[0145] Preparation of double-terminated vinyl silicone oil 9

[0146] 292.5g of decamethylcyclopentasiloxane, 6.1g of 1,3-divinyltetramethyldisiloxane, and 9.6g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 15.6g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170°C and -0.095kPa for 6 hours to obtain dual-end vinyl silicone oil 9 (component B). The vinyl content was analyzed to be 0.55%, and the number average molecular weight was 9983.

[0147] Preparation of Organosilicon Elastomer Gel 13

[0148] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 5g of hydrogen-containing silicone oil 8 and 54g of double-terminated vinyl silicone oil 9 evenly; then add 109.6g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0149] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent gel was obtained, with a light transmittance of 93.9%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 4 points.

[0150] Example 14

[0151] Preparation of hydrogen-containing silicone oil 15

[0152] 360g of octamethylcyclotetrasiloxane, 40g of 1,3,5,7-tetramethylcyclotetrasiloxane, 15g of low-viscosity polydimethylsiloxane with a viscosity of 2cSt, and 13.3g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45℃ for 8 hours. 21.5g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170℃ and -0.095kPa for 6 hours to obtain hydrogen-containing silicone oil 15 (component A). The hydrogen content was analyzed to be 0.15%, and the number average molecular weight was 8107.

[0153] Preparation of dual-terminated vinyl silicone oil 13

[0154] 292.5g of octamethylcyclotetrasiloxane, 16.8g of low-viscosity dual-end vinyl silicone oil (viscosity 3cSt) and 9.9g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45℃ for 8 hours. 16.1g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170℃ and -0.095kPa for 6 hours to obtain dual-end vinyl silicone oil 1 (component B). The vinyl content was analyzed to be 0.69% and the number average molecular weight was 7984.

[0155] Preparation of organosilicon elastomer gel

[0156] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 10g of hydrogen-containing silicone oil 15 and 58.7g of double-terminated vinyl silicone oil 13 evenly; then add 127.6g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 6.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0157] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent gel was obtained, with a light transmittance of 93.9%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 4 points.

[0158] Example 15

[0159] Preparation of hydrogen-containing silicone oil 9

[0160] 360g of octamethylcyclotetrasiloxane, 40g of 1,3,5,7-tetramethylcyclotetrasiloxane, 15g of hexamethyldisiloxane and 13.3g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 21.5g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain colorless and transparent hydrogen-containing silicone oil 9 (component A). The hydrogen content was analyzed to be 0.14% and the number average molecular weight was 2810.

[0161] Preparation of double-terminated vinyl silicone oil 10

[0162] 296g of octamethylcyclotetrasiloxane, 16.8g of 1,3-divinyltetramethyldisiloxane and 9.9g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 16.1g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain colorless and transparent double-ended vinyl silicone oil 10 (component B). The vinyl content was analyzed to be 1.32% and the number average molecular weight was 4107.

[0163] Preparation of Organosilicon Elastomer Gel 14

[0164] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 10g of hydrogen-containing silicone oil 9 and 28.6g of double-terminated vinyl silicone oil 10 evenly; then add 71.7g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0165] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent gel was obtained, with a light transmittance of 90.8%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 3.5.

[0166] Example 16

[0167] Preparation of dual-terminated vinyl silicone oil 12

[0168] 450g of octamethylcyclotetrasiloxane, 2.7g of 1,3-divinyltetramethyldisiloxane, and 14.5g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 23.5g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. The liquid was then subjected to reduced pressure distillation at 150-170°C and -0.095kPa for 6 hours to remove low-boiling substances, yielding dual-end vinyl silicone oil 12 (component B). Analysis showed that its vinyl content was 0.12% and its number average molecular weight was 42513.

[0169] Preparation of Organosilicon Elastomer Gel 17

[0170] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 2.5g of hydrogen-containing silicone oil 1 and 84.4g of double-terminated vinyl silicone oil 12 evenly; then add 161.4g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0171] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent jelly-like gel was obtained with good elasticity. Its light transmittance was 95.9%, and the skin feel evaluation results showed that it had a poor powdery feel, with a powdery feel score of 2 points.

[0172] Example 17

[0173] Preparation of hydrogen-containing silicone oil 11

[0174] 360g of octamethylcyclotetrasiloxane, 41.7g of 1,3,5,7-tetramethylcyclotetrasiloxane, 31.4g of hexamethyldisiloxane, and 13.9g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 22.6g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170°C and -0.095kPa for 6 hours to obtain hydrogen-containing silicone oil 11 (component A). The hydrogen content was analyzed to be 0.15%, and the number average molecular weight was 1321.

[0175] Preparation of Organosilicon Elastomer Gel 18

[0176] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 10g of hydrogen-containing silicone oil 11 and 30.7g of double-terminated vinyl silicone oil 1 evenly; then add 75.6g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0177] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent liquid with a certain degree of fluidity was obtained. Its light transmittance was 93.7%, and the skin feel evaluation results showed that it had a very poor powdery feel, with a powdery feel score of 1 point.

[0178] Example 18

[0179] Preparation of hydrogen-containing silicone oil 12

[0180] 360g of octamethylcyclotetrasiloxane, 38.5g of 1,3,5,7-tetramethylcyclotetrasiloxane, 4g of hexamethyldisiloxane, and 12.9g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 21g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170°C and -0.095kPa for 6 hours to obtain hydrogen-containing silicone oil 12 (component A). The hydrogen content was analyzed to be 0.15%, and the number average molecular weight was 21620.

[0181] Preparation of Organosilicon Elastomer Gel 19

[0182] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 10g of hydrogen-containing silicone oil 12 and 30.7g of double-terminated vinyl silicone oil 1 evenly; then add 75.6g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0183] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow turbid gel was obtained, with a light transmittance of 70.2%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 3.5.

[0184] Example 19

[0185] Preparation of hydrogen-containing silicone oil 13

[0186] 360g of octamethylcyclotetrasiloxane, 12.5g of 1,3,5,7-tetramethylcyclotetrasiloxane, 14g of hexamethyldisiloxane, and 12.4g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 20.1g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170°C and -0.095kPa for 6 hours to obtain hydrogen-containing silicone oil 13 (component A). The hydrogen content was analyzed to be 0.05%, and the number average molecular weight was 3021.

[0187] Preparation of Organosilicon Elastomer Gel 20

[0188] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 30g of hydrogen-containing silicone oil 13 and 30.6g of double-terminated vinyl silicone oil 1 evenly; then add 112.5g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0189] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow transparent viscous liquid with strong fluidity was obtained. Its light transmittance was 96.7%, and the skin feel evaluation results showed that it had no powdery feel, with a powdery feel score of 0.

[0190] Example 20

[0191] Preparation of hydrogen-containing silicone oil 14

[0192] 180g of octamethylcyclotetrasiloxane, 123g of 1,3,5,7-tetramethylcyclotetrasiloxane, 11.3g of hexamethyldisiloxane, and 10.1g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 16.4g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170°C and -0.095kPa for 6 hours to obtain hydrogen-containing silicone oil 13 (component A). The hydrogen content was analyzed to be 0.61%, and the number average molecular weight was 3498.

[0193] Preparation of Organosilicon Elastomer Gel 21

[0194] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 5g of hydrogen-containing silicone oil 14 and 62.4g of double-terminated vinyl silicone oil 1 evenly; then add 125.2g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0195] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow turbid gel was obtained. After one week, it was found that the solid and liquid separated. Its light transmittance was measured to be 63.2%, and the skin feel evaluation results showed that it had a poor powdery feel, with a powdery feel score of 2 points.

[0196] Example 21

[0197] The process is largely the same as in Example 1, except that 366.3 g of polydimethylsiloxane (viscosity 5 cSt) was added during the preparation of the silicone elastomer gel to adjust the initial elastomer content (IEC) in the gel to 10%. Furthermore, after shearing and pulverizing using a three-roll mill without adding additional solvent (polydimethylsiloxane (viscosity 5 cSt), the final elastomer content (FEC) in the gel is also 10%.

[0198] The final product had a light transmittance of 96.3% and a skin feel evaluation result showing that it had a strong powdery feel, with a powdery feel score of 3 points.

[0199] Example 22

[0200] The process is largely the same as in Example 1, except that polydimethylsiloxane is not added to adjust the elastomer content in the initial gel during the preparation of the organosilicon elastomer gel, and the elastomer content IEC is kept at 100%.

[0201] The final product had a light transmittance of 74.8% and a skin feel score of 4.5, according to the test results.

[0202] Example 23

[0203] The process is largely the same as in Example 1, except that in the preparation of the silicone elastomer gel, after stirring evenly, it is allowed to stand at 90°C for 6 hours.

[0204] The final product had a light transmittance of 93.5% and a skin feel score of 4 points, according to the test results.

[0205] Example 24

[0206] The process is largely the same as in Example 1, except that in the preparation of the silicone elastomer gel, after stirring evenly, it is allowed to stand at 70°C for 10 hours.

[0207] The final product passed the test and had a light transmittance of 93.7%. The skin feel evaluation results showed that it had a strong powdery feel, and the powdery feel score was 4 points.

[0208] Example 25

[0209] The system is largely the same as Example 1, except that the concentration of platinum in the system is 1.5 ppm.

[0210] The final product had a light transmittance of 93.9% and a skin feel score of 3.5, according to the test results.

[0211] Example 26

[0212] The system is largely the same as Example 1, except that the concentration of platinum in the system is 10 ppm.

[0213] The final product passed the test and had a light transmittance of 93.6%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 4 points. The product appeared brownish-yellow.

[0214] Example 27

[0215] The method is largely the same as in Example 1, except that the elastomer content in the initial gel is adjusted using polydimethylsiloxane with a viscosity of 1.5 cSt.

[0216] The final product had a light transmittance of 94.1% and a skin feel score of 4 points, according to the test results.

[0217] Example 28

[0218] The method is largely the same as in Example 1, except that the elastomer content in the initial gel is adjusted using polydimethylsiloxane with a viscosity of 20 cSt.

[0219] The final product passed the test and had a light transmittance of 93.3%. The skin feel evaluation results showed that it had a strong powdery feel, and the powdery feel score was 4 points.

[0220] Example 29

[0221] The process is largely the same as in Example 14, except that 5.0 cSt low-viscosity polydimethylsiloxane is used in the preparation of the hydrogen-containing silicone oil.

[0222] The final product passed the test and had a light transmittance of 94.0%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 4 points.

[0223] Example 30

[0224] The process is largely the same as in Example 14, except that a low-viscosity polydimethylsiloxane of 10.0 cSt is used in the preparation of the hydrogen-containing silicone oil.

[0225] In preparing the dual-terminated vinyl silicone oil, a low-viscosity dual-terminated vinyl silicone oil of 10.0 cSt was used.

[0226] The final product had a light transmittance of 94.3% and a skin feel score of 4 points, according to the test results.

[0227] Example 31

[0228] The process is largely the same as in Example 1, except that the reaction temperature is 40°C and the reaction time is 10 hours during the preparation of the hydrogen-containing silicone oil.

[0229] In the preparation of dual-terminated vinyl silicone oil, the reaction temperature was 50℃ and the reaction time was 6h.

[0230] The final product passed the test and had a light transmittance of 93.8%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 4 points.

[0231] Example 32

[0232] The process is largely the same as in Example 1, except that the reaction temperature is 50°C and the reaction time is 6 hours in the preparation of the hydrogen-containing silicone oil.

[0233] In the preparation of dual-terminated vinyl silicone oil, the reaction temperature was 40℃ and the reaction time was 10h.

[0234] The final product passed the test and had a light transmittance of 93.6%. The skin feel evaluation results showed that it had a strong powdery feel, and the powdery feel score was 4 points.

[0235] Comparative Example 1

[0236] Preparation of double-terminated vinyl silicone oil 11

[0237] 165g of octamethylcyclotetrasiloxane, 85g of 1,3-divinyltetramethyldisiloxane, and 8g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 13g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. The liquid was then subjected to reduced pressure distillation at 150-170°C and -0.095kPa for 6 hours to remove low-boiling substances, yielding dual-end vinyl silicone oil 11 (component B). Analysis showed that its vinyl content was 6.1% and its number average molecular weight was 873.

[0238] Preparation of Organosilicon Elastomer Gel 15

[0239] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 50g of hydrogen-containing silicone oil 1 and 33.2g of double-terminated vinyl silicone oil 11 evenly; then add 154.5g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0240] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow translucent gel was obtained, with a light transmittance of 83.4%. The skin feel evaluation results showed that it had a general powdery feel, with a powdery feel score of 3 points.

[0241] Comparative Example 2

[0242] Preparation of hydrogen-containing silicone oil 10

[0243] 340g of octamethylcyclotetrasiloxane, 37g of 1,3,5,7-tetramethylcyclotetrasiloxane, 8.5g of hexamethyldisiloxane, and 12.3g of concentrated sulfuric acid catalyst were mixed evenly and reacted at 45°C for 8 hours. 20g of sodium carbonate was added for neutralization and stirring for 2 hours. The mixture was then filtered under reduced pressure through a Buchner funnel to obtain a colorless and transparent liquid. Low-boiling substances were removed by vacuum distillation at 150-170°C and -0.095kPa for 6 hours to obtain hydrogen-containing silicone oil 10 (component A). The hydrogen content was analyzed to be 0.15%, and the number average molecular weight was 6573.

[0244] Preparation of Organosilicon Elastomer Gel 16

[0245] Maintaining a 1:1 ratio of silane bonds to double bonds, first mix 50g of hydrogen-containing silicone oil 10 and 33.2g of double-terminated vinyl silicone oil 11 evenly; then add 154.5g of polydimethylsiloxane (viscosity 5cSt) to adjust the elastomer content (IEC) in the initial gel to 35%; finally, add vinyl platinum complex catalyst to the system to make the concentration of metallic platinum in the system 4.0ppm, stir evenly, and let it stand at 80℃ for 8 hours to react.

[0246] The product from the previous step was sheared and pulverized using a three-roll mill, re-weighed, and then diluted and swollen with an additional solvent, polydimethylsiloxane (viscosity 5 cSt), to adjust the elastomer content (FEC) in the final gel to 20%. After centrifugation or vacuum degassing, a colorless to pale yellow turbid gel was obtained, with a light transmittance of 75.7%. The skin feel evaluation results showed that it had a strong powdery feel, with a powdery feel score of 4 points.

[0247] Physicochemical index testing:

[0248] Methods for detecting hydrogen content in hydrogen-containing silicone oil:

[0249] 1. Accurately weigh 0.1g of the hydrogen-containing silicone oil sample to be tested into a 250mL iodine flask;

[0250] 2. Dissolve the sample in 50 mL of n-hexane in an iodine flask. Then, pipette 10 mL of iodine monochloride-glacial acetic acid into the iodine flask, mix well, and finally seal with deionized water. Incubate in the dark at 25°C for 1 hour.

[0251] 3. Add 50 mL of 10% potassium iodide solution to the iodine flask, then rinse the mouth of the flask with deionized water. Next, titrate with 0.1 mol / L sodium thiosulfate standard solution. When the solution turns pale yellow, add 1 mL of starch indicator and continue titrating until the blue color just disappears, which is the endpoint.

[0252] 4. Using the same method as above, conduct a blank experiment as a control.

[0253] 5. Finally, the hydrogen content is calculated using the following formula:

[0254]

[0255] In the formula:

[0256] c — Concentration of sodium thiosulfate standard solution, in mol / L;

[0257] V0—The volume of sodium thiosulfate standard solution consumed in the blank experiment titration to the endpoint, in mL;

[0258] V1—The volume of sodium thiosulfate standard solution consumed in titrating the sample to the endpoint, in mL;

[0259] m — the actual mass of the sample to be tested, in grams.

[0260] Methods for determining vinyl content in double-ended vinyl silicone oils:

[0261] 1. Accurately weigh 0.1g of the double-ended vinyl silicone oil sample to be tested into a 250mL iodine flask;

[0262] 2. Add 40 mL of n-hexane to the iodine flask to dissolve the sample completely. Then, use a pipette to transfer 10 mL of iodine bromide solution into the iodine flask and shake well. Incubate in the dark at 25°C for 1 hour.

[0263] 3. Add 100 mL of distilled water and 15 mL of potassium iodide solution to the iodine flask, shake for 2-3 minutes, and then titrate with 0.1 mol / L sodium thiosulfate standard solution. When the lower layer of the solution is pale yellow and the upper layer of the solution is pink, add 2 mL of starch indicator solution and continue titrating until the blue color just disappears, which is the endpoint.

[0264] 4. Using the same method as above, conduct a blank experiment as a control.

[0265] 5. Finally, the vinyl content is calculated using the following formula:

[0266]

[0267] In the formula:

[0268] m—the actual mass of the sample to be tested, in grams;

[0269] c — Concentration of sodium thiosulfate standard solution, in mol / L;

[0270] V0—The volume of sodium thiosulfate standard solution consumed in the blank experiment titration to the endpoint, in mL;

[0271] V1 — The volume of sodium thiosulfate standard solution consumed in titrating the sample to the endpoint, in mL.

[0272] Transmittance testing method:

[0273] 1. Place the elastomer gel sample into a 1cm cuvette, then place it into a plastic centrifuge tube and centrifuge at 3500 rpm to remove bubbles until no bubbles remain.

[0274] 2. Turn on the UV spectrophotometer and preheat the instrument for 20 minutes.

[0275] 3. In another clean blank cuvette, place clean decamethylcyclopentasiloxane as a standard. Measure its transmittance at 420 nm to calibrate the instrument and ensure that its transmittance is 100 ± 0.01.

[0276] 4. Using the above-mentioned decamethylcyclopentasiloxane as a reference, the transmittance of the elastomer gel sample was determined. The measurement was performed in parallel three times, and the average value of the results was taken as the transmittance of the elastomer gel sample to be tested.

[0277] Performance evaluation:

[0278] Powder texture evaluation method:

[0279] Weigh 0.5g of silicone elastomer polymer and apply it evenly to the clean, dry back of the hand, spreading it to the same size. Then, judge the quality of the powdery feel by sensory evaluation. The lowest powdery feel score is 1 and the highest is 5. Ten experienced daily chemical formulation engineers were selected to conduct this evaluation, and then the average score was calculated. The higher the score, the better the powdery feel. The test results are shown in Table 1.

[0280] Thickening viscosity testing method:

[0281] Weigh 100.0g of organosilicon gel compound and add it to a 500mL beaker. Add 200.0g of decamethylcyclopentasiloxane to the beaker. After mechanically stirring at room temperature for 30min, a diluted organosilicon gel sample is obtained. Store the sample in a 25℃ constant temperature oven for 24h, and then use a Brookfield rotational viscometer to test the viscosity.

[0282] The test results are shown in Table 1.

[0283] Table 1 Test Results

[0284]

[0285]

[0286]

[0287] Results analysis:

[0288] 1. Comparison of the results of Example 1, Comparative Example 1 and Comparative Example 2. The reason why the transmittance and thickening effect of Comparative Example 1 and Comparative Example 2 decreased significantly may be that the molecular weight of the double-ended vinyl silicone oil used as a crosslinking agent is too low, which makes the spacing between adjacent chains of the hydrogen-containing silicone oil too short, resulting in too many crosslinking points per unit volume. The excessively dense crosslinking points lead to a decrease in transmittance. At the same time, the small mesh structure is not conducive to increasing physical entanglement, which in turn leads to a certain degree of reduction and weakening of viscosity and powdery feel.

[0289] 2. A comparison of the results from Examples 1, 19, and 20 reveals that as the hydrogen content increases, the swelling capacity of the elastomer gel significantly improves, and the powdery feel slightly enhances. However, when the hydrogen content reaches a certain level, the swelling capacity (thickening viscosity), light transmittance, and powdery feel significantly deteriorate. The possible reason is that within a certain range, increasing the hydrogen content of the hydrogen-containing silicone oil can increase the chemical cross-linking sites, and moderately increasing the cross-linking density of the elastomer is beneficial for enhancing the powdery feel. Too low a hydrogen content will result in insufficient cross-linking of the elastomer, leading to poor thickening capacity and an oily, sticky feel. Too high a hydrogen content will cause excessive cross-linking of the elastomer, resulting in an overly dense network. At this point, the transparency of the elastomer gel decreases drastically, it becomes virtually impossible to swell, solid and liquid separate, and the thickening capacity is also very poor.

[0290] 3. Comparison of the results of Example 1 with Examples 17 and 18, and with Comparative Examples 1 and 2, reveals that as the molecular weight of the hydrogen-containing silicone oil increases, the swelling capacity of the elastomer gel slightly increases, while the powdery feel significantly enhances. However, when the molecular weight of the hydrogen-containing silicone oil reaches a certain level, the swelling capacity, light transmittance, and powdery feel deteriorate significantly. The possible reason is that within a certain range, increasing the molecular weight of the hydrogen-containing silicone oil can enhance the physical entanglement of the system, moderately increasing the crosslinking density of the elastomer, thereby significantly worsening the light transmittance, powdery feel, and thickening viscosity. Too low a molecular weight of the hydrogen-containing silicone oil will result in insufficient functionality within individual molecules, leading to poor thickening ability and an oily, sticky feel. Too high a molecular weight will cause excessive entanglement of the elastomer molecular chains, resulting in decreased transparency and poor swelling of the elastomer gel, separation of the solid and liquid phases, and a deterioration in thickening ability.

[0291] 4. By comparing the results of Examples 1, 2, 1, and 16, as well as Examples 3 and 4, it can be found that within a certain range, increasing the chain length of the crosslinking agent, the vinyl silicone oil at both ends, simultaneously improves both light transmittance and thickening ability. This may be because increasing the chain length of the crosslinking agent increases the three-dimensional crosslinking network to some extent, reduces the density of chemical crosslinking sites, and improves transparency. Simultaneously, a longer chain length helps increase physical entanglement, resulting in a stronger powdery feel, thus improving gel transparency while maintaining a good powdery and velvety feel. It should be noted that while increasing the chain length of the vinyl silicone oil may be necessary, the hydrogen content of the hydrogen-containing silicone oil also needs to be appropriately increased to supplement chemical crosslinking sites. Furthermore, the chain length of the vinyl silicone oil should not be excessively increased, otherwise, insufficient crosslinking will occur.

[0292] 5. As can be seen from the experiments in Examples 1 to 15, under the control of factors such as appropriate hydrogen content, molecular weight of hydrogen-containing silicone oil, and molecular weight of double-ended vinyl silicone oil, both light transmittance and powder feel can be optimized.

[0293] 6. As can be seen from the experiments in Examples 21 to 32, under the conditions of appropriate reaction temperature and time, appropriate catalyst dosage, and appropriate preparation process of organosilicon elastomer gel, both light transmittance and powdery feel can be optimized.

[0294] The above analysis shows that the transparency of elastomer gels is mainly determined by the cross-linking structure of the cross-linking material.

[0295] The structural parameters of the hydrogen-containing silicone oil and vinyl silicone oil involved in the cross-linking reaction, such as hydrogen content, viscosity of hydrogen-containing silicone oil, viscosity of vinyl silicone oil, and the ratio of silicon-hydrogen bonds to double bonds, will individually or jointly affect the cross-linking state of the cross-linked material. By optimizing the hydrogen content, viscosity of hydrogen-containing silicone oil, viscosity of vinyl silicone oil, and the ratio of silicon-hydrogen bonds to double bonds, the transmittance, viscosity, and powderiness can be further affected.

[0296] The applicant declares that the present invention is illustrated by the above embodiments, but the present invention is not limited to the above process steps, nor does it mean that the present invention must rely on the above process steps to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of the raw materials used in the present invention, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A silicone elastomer gel characterized in that, The solvent, hydrogen-containing silicone oil, double-end vinyl silicone oil and platinum catalyst are mixed and reacted at 70-90 DEG C for 6-10 hours to prepare the silicone elastomer, the silicone elastomer is sheared and crushed, then the solvent is added for dilution and swelling, and the silicone elastomer gel is obtained after centrifugation or vacuum defoaming. The solvent is polydimethylsiloxane, and the viscosity of the polydimethylsiloxane is 1.5-20 cSt. The hydrogen content of the hydrogen-containing silicone oil is 0.10wt%-0.51wt%, the number average molecular weight of the hydrogen-containing silicone oil is 1900-15100, and the number average molecular weight of the double-end vinyl silicone oil is 4000-32000. The structure of the hydrogen-containing silicone oil is: ； m=23-125; n=2-75. The molar ratio of the silicon-hydrogen bond of the hydrogen-containing silicone oil to the olefin bond of the double-end vinyl silicone oil is 0.8-1.2:

1.

2. The silicone elastomer gel of claim 1, wherein, The vinyl content of the double-end vinyl silicone oil is 0.15%-1.4%.

3. The silicone elastomer gel of claim 1, wherein, The hydrogen-containing silicone oil is mainly made of a capping agent, a first reactant and a second reactant, wherein the mass ratio of the first reactant, the second reactant and the capping agent is 250-360:40-138:5.4-31, and / or the capping agent is hexamethyldisiloxane and / or low-viscosity polydimethylsiloxane, the viscosity of the low-viscosity polydimethylsiloxane ranges from 2.0 to 10.0 cSt, and / or the first reactant is one or more combinations of octamethylcyclotetrasiloxane, hexamethylcyclotrisiloxane, decamethylcyclopentasiloxane and dodecamethylcyclohexasiloxane, and / or the second reactant is 1,3,5,7-tetramethylcyclotetrasiloxane and / or full hydrogen-containing silicone oil.

4. The silicone elastomer gel of claim 1, wherein, The double-end vinyl silicone oil is mainly made of a third reactant and a fourth reactant, wherein the molar ratio of the third reactant to the fourth reactant is 1:8-14, and / or the third reactant is 1,3-divinyltetramethyldisiloxane and / or low-viscosity double-end vinyl silicone oil, the viscosity of the low-viscosity double-end vinyl silicone oil ranges from 3.0 to 10.0 cSt, and / or the fourth reactant is one or more combinations of octamethylcyclotetrasiloxane, hexamethylcyclotrisiloxane, decamethylcyclopentasiloxane and dodecamethylcyclohexasiloxane.

5. The silicone elastomer gel of claim 1, wherein, The hydrogen-containing silicone oil and the double-end vinyl silicone oil do not contain light components, and the light components are unreacted monomers and / or oligomers of volatile monomers.

6. A process for the preparation of the silicone elastomer gel according to any one of claims 1 to 5, characterized in that, The solvent, hydrogen-containing silicone oil, double-end vinyl silicone oil and platinum catalyst are mixed and reacted at 70-90 DEG C for 6-10 hours to prepare the silicone elastomer, the silicone elastomer is sheared and crushed, then the solvent is added for dilution and swelling, and the silicone elastomer gel is obtained after centrifugation or vacuum defoaming.

7. The method of making a silicone elastomer gel according to claim 6, wherein, The preparation method of the hydrogen-containing silicone oil and the double-end vinyl silicone oil is as follows: the required reactants and an acidic catalyst are mixed and reacted at 40-50 DEG C for 6-10 hours, then the acidic catalyst is neutralized to obtain the corresponding hydrogen-containing silicone oil or double-end vinyl silicone oil.

8. The method of making a silicone elastomer gel according to claim 7, wherein, The solvent is polydimethylsiloxane, the viscosity of which is 1.5-20 cSt; And / or, the total weight of the hydrogen-containing silicone oil and the double-end vinyl silicone oil accounts for 10-100% of the total weight of the whole reaction system; And / or, the platinum gold catalyst is isopropanol solution of chloroplatinic acid or vinyl platinum complex; And / or, the amount of the platinum gold catalyst is the amount that makes the concentration of platinum metal in the system reach 1.5-10 ppm.

9. The method of making a silicone elastomer gel according to claim 6, wherein, The hydrogen-containing silicone oil and the double-end vinyl silicone oil are removed of light components by way of reduced pressure distillation.

10. The method of making a silicone elastomer gel according to claim 6, wherein Shearing pulverization is carried out by using a three-roll grinder.

11. A daily care product, characterized in that The silicone elastomer gel containing the silicone elastomer gel as claimed in any one of claims 1-5.

12. Use of the silicone elastomer gel as claimed in any one of claims 1-5 as a skin feel modifier or thickener.

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