Water-soluble polysiloxane as well as preparation method and application thereof

Abstract

The invention belongs to the field of polymer chemistry, and particularly relates to water-soluble polysiloxane as well as a preparation method and application thereof. The water-soluble polysiloxane has a structure as shown in a formula I: # imgabs0 #, R1 is aminoethyl aminopropyl, R2 is vinyl or phenyl, the sum of X and Y is 100%, and X is 35%-100% and does not include 100%. The water-soluble polysiloxane has hydrophilicity and adjustable solubility, the solubility of the water-soluble polysiloxane in water can be regulated and controlled by regulating the proportion of various groups in the formula, and the water-soluble polysiloxane can be widely applied to the fields of coatings, cosmetics, medicines and the like.

Description

Technical Field

[0001] The invention belongs to the field of polymer chemistry, and specifically relates to a water-soluble polysiloxane and a preparation method and application thereof. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] Polysiloxanes are widely used in many fields due to their excellent chemical stability, thermal stability and biocompatibility. Traditional polysiloxane materials are mainly hydrophobic, which has limitations in some applications that require hydrophilic properties. In order to prepare hydrophilic polysiloxane materials, on the one hand, hydrophilic monomers can be copolymerized with siloxane monomers, but generally siloxane monomers have poor compatibility with hydrophilic monomers due to their high hydrophobicity; on the other hand, polysiloxanes containing hydrophilic side chains can be prepared, and polysiloxane materials with good water solubility can be prepared by introducing hydrophilic groups such as amino groups and hydroxyl groups into the polysiloxane structure. However, existing polysiloxanes contain a large variety of hydrophilic side chains in each molecule, and hydrophilicity and solubility are difficult to control. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, the present invention provides a water-soluble polysiloxane and a preparation method and application thereof. The water-soluble polysiloxane has hydrophilicity and adjustable solubility. The solubility in water can be regulated by adjusting the proportion of various groups in the formula. The water-soluble polysiloxane can be widely used in coatings, cosmetics, medicine and other fields.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] In a first aspect, the present invention provides a water-soluble polysiloxane having a structure as shown in Formula I:

[0007]

[0008] Among them, R 1 is aminoethylaminopropyl, R 2 is vinyl or phenyl, X+Y=100%, X=35%-100% (excluding 100%).

[0009] Preferably, when R 2 In the case of vinyl, X=50%-100%, excluding 100%.

[0010] More preferably, when R 2 In the case of vinyl, X=70%-95%.

[0011] Preferably, when R 2 When it is a phenyl group, X=70%-100%, excluding 100%.

[0012] More preferably, when R 2 When it is phenyl, X = 80%-95%.

[0013] In a second aspect, the present invention provides a method for preparing the water-soluble polysiloxane as described in the first aspect, comprising the following steps:

[0014] Silane, aminoethylaminopropylsilane, a catalyst and deionized water are mixed and reacted under an inert atmosphere, and then distilled under reduced pressure to obtain the water-soluble polysiloxane.

[0015] Preferably, the silane includes at least one of tetramethyltetravinylcyclotetrasiloxane, dimethoxymethylvinylsilane, methylvinyldiethoxysilane, methylbis(trimethylsiloxy)vinylsilane, methylphenylcyclosiloxane, dimethoxymethylphenylsilane and diethoxymethylphenylsilane.

[0016] Preferably, the aminoethylaminopropylsilane includes at least one of N-(β-aminoethyl-γ-aminopropyl)methyldimethoxysilane and N-(β-aminoethyl-γ-aminopropyl)methyldiethoxysilane.

[0017] Preferably, the catalyst comprises at least one of tetramethylammonium hydroxide (TMHA), tetramethylammonium hydroxide siliconate, sodium hydroxide and potassium hydroxide.

[0018] Preferably, the reaction temperature is 40°C to 200°C, and the reaction time is 0.5 to 10 hours.

[0019] Preferably, the reaction is carried out in two steps, first reacting at 90°C to 110°C for 0.5 to 3 hours, and then heating to 140°C to 160°C for 0.5 to 1 hour.

[0020] In a third aspect, the present invention provides the use of the water-soluble polysiloxane as described in the first aspect in water-based coatings, cosmetics, drug carriers or environmental protection fields.

[0021] The beneficial effects achieved by one or more technical solutions of the present invention are as follows:

[0022] Water-soluble polysiloxane can effectively adjust its solubility in water by adjusting the proportion of hydrophilic groups therein to meet the needs of different application scenarios.

[0023] The synthesis method of water-soluble polysiloxane is simple to operate, can achieve efficient synthesis under relatively mild conditions, and has good operability.

[0024] Water-soluble polysiloxanes can be widely used in water-based coatings, cosmetics, drug carriers and other fields, especially in the fields of environmental protection and biomedicine, and have great potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 Schematic diagram of the molecular structure of (a) VAPSi and (b) PhAPSi;

[0027] Figure 2 (a) VAPSi 1-9 and (b) PhAPSi 3-7 Infrared (FT-IR) spectrum;

[0028] Figure 3 (a) VAPSi 1-9 and (b) PhAPSi 3-7 1H NMR spectrum. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to more clearly understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below in combination with specific embodiments and comparative examples.

[0030] Will contain R 1 The chain segment is named as methylaminoethylaminopropyl chain segment. 2 When it is vinyl, the water-soluble polysiloxane is named VAPSi, containing R 2 The chain segment is named as methyl vinyl chain segment. The schematic diagram of VAPSi molecular structure is as follows Figure 1 As shown in (a); when R 2 When it is phenyl, the water-soluble polysiloxane is named PhAPSi, containing R 2 The chain segment is named as methylphenyl chain segment. The schematic diagram of PhAPSi molecular structure is as follows Figure 1 As shown in (b) in .

[0031] The solubility determination scheme of water-soluble polysiloxane is as follows:

[0032] Take a certain mass of water-soluble polysiloxane sample, add it to a known volume of deionized water, place the mixture in a 25°C temperature-controlled water bath, and continue stirring for 1 to 24 hours to ensure that the water-soluble polysiloxane is fully in contact with water. During the dissolution process, regularly sample and filter to remove the undissolved part until it no longer dissolves. Evaporate the filtered solution to obtain the mass of dissolved polysiloxane, and calculate the solubility of the water-soluble polysiloxane by the formula.

[0033] The solubility calculation formula of water-soluble polysiloxane is as follows:

[0034]

[0035] Example 1

[0036] Preparation of water-soluble polysiloxane (VAPSi) with 10% methylaminoethylaminopropyl chain design and 90% methylvinyl chain design 1-9 ).

[0037] 8.6 g D 4 Vi , 185.4g AEAPMDS, 16.2g distilled water and 0.04g TMHA catalyst were added to a three-necked flask; the reaction system was replaced with nitrogen three times to isolate oxygen, the temperature was raised to 100°C for reaction for 0.5h, and then raised to 150°C for reaction for 0.5h to deactivate the catalyst; the temperature was cooled to room temperature and vacuum distillation was started to remove low-boiling methanol, water and its by-products to obtain VAPSi 1-9 .like Figure 2 As shown in (a) in the figure, the FT-IR spectrum shows typical absorption peaks of the siloxane skeleton and characteristic absorption peaks of each group, proving the successful synthesis of polysiloxane. Figure 3 As shown in (a), 1 The characteristic peaks of methyl, vinyl, phenyl and amino groups can be clearly observed in the H NMR spectrum, and the actual proportion of methylvinyl chain segments is 9.8%, and the actual proportion of methylaminoethylaminopropyl chain segments is 90.2% calculated by peak area integration.

[0038] VAPSi 1-9 Add dropwise into 100 mL of deionized water and keep stirring at 25 °C until VAPSi 1-9 Completely dissolved until VAPSi 1-9 When no more dissolution occurs, the dripping is stopped, and the undissolved part is filtered to obtain a clear hydrophilic polysiloxane aqueous solution. Finally, the solution is evaporated to obtain the mass of the dissolved polysiloxane, and the solubility of the water-soluble polysiloxane is calculated by the formula.

[0039] Comparative Example 1:

[0040] Preparation of polysiloxane (VPSi) with 10% methylvinyl chain design and 90% dimethyl chain design 1-9 ).

[0041] 8.6 g D 4 Vi , 66.6g octamethylcyclotetrasiloxane and 0.04g TMHA catalyst were added to a three-necked flask; nitrogen was used to replace the reaction system three times, oxygen was isolated, the temperature was raised to 100°C for reaction for 0.5h, and then the temperature was raised to 150°C for reaction for 0.5h to deactivate the catalyst; the temperature was lowered to room temperature and vacuum distillation was started to remove low-boiling substances. VPSi with an actual proportion of 10.3% of methyl vinyl segments and an actual proportion of 89.7% of dimethyl segments was obtained. 1-9 .

[0042] VPSi 1-9 Add dropwise into 100 mL of deionized water and keep stirring at 25 °C until VPSi 1-9 Completely dissolved until VAPSi 1-9 When no more dissolution occurs, the dripping is stopped, and the undissolved part is filtered to obtain a clear hydrophilic polysiloxane aqueous solution. Finally, the solution is evaporated to obtain the mass of the dissolved polysiloxane, and the solubility of the water-soluble polysiloxane is calculated by the formula.

[0043] Example 2

[0044] Preparation of water-soluble polysiloxane (VAPSi) with methyl vinyl chain design accounting for 20% and methyl aminoethyl aminopropyl chain design accounting for 80% 2-8 ).

[0045] 17.2 g D 4 Vi , 164.8g AEAPMDS, 14.4g distilled water and 0.04g TMHA catalyst were added to a three-necked flask; the reaction system was replaced with nitrogen three times to isolate oxygen, the temperature was raised to 100°C for reaction for 1h, and then raised to 150°C for reaction for 0.5h to deactivate the catalyst; the temperature was cooled to room temperature and reduced pressure distillation was started to remove low-boiling methanol, water and its by-products to obtain VAPSi with an actual proportion of 20.3% of methylvinyl segments and 79.7% of methylaminoethylaminopropyl segments. 2-8 .

[0046] VAPSi 2-8 Add dropwise into 100 mL of deionized water and keep stirring at 25 °C until VAPSi 2-8 Completely dissolved until VAPSi 2-8When no more dissolution occurs, the dripping is stopped, and the undissolved part is filtered to obtain a clear hydrophilic polysiloxane aqueous solution. Finally, the solution is evaporated to obtain the mass of the dissolved polysiloxane, and the solubility of the water-soluble polysiloxane is calculated by the formula.

[0047] Example 3

[0048] Preparation of water-soluble polysiloxane (VAPSi) with methyl vinyl chain design accounting for 30% and methyl aminoethyl aminopropyl chain design accounting for 70% 3-7 ).

[0049] 25.8 g D 4 Vi, 144.2g AEAPMDS, 12.6g distilled water and 0.04g TMHA catalyst were added to a three-necked flask; nitrogen was used to replace the reaction system three times, oxygen was isolated, the temperature was raised to 100°C for reaction for 1.5h, and then raised to 150°C for reaction for 0.5h to deactivate the catalyst; the temperature was lowered to room temperature, and reduced pressure distillation was started to remove low-boiling methanol, water and its by-products. VAPSi with 30.1% methylvinyl chain segments and 69.9% methylaminoethylaminopropyl chain segments was obtained. 3-7 .

[0050] VAPSi 3-7 Add dropwise into 100 mL of deionized water and keep stirring at 25 °C until VAPSi 3-7 Completely dissolved until VAPSi 3-7 When no more dissolution occurs, the dripping is stopped, and the undissolved part is filtered to obtain a clear hydrophilic polysiloxane aqueous solution. Finally, the solution is evaporated to obtain the mass of the dissolved polysiloxane, and the solubility of the water-soluble polysiloxane is calculated by the formula.

[0051] Example 4

[0052] Preparation of water-soluble polysiloxane (VAPSi) with 40% methylvinyl chain design and 60% methylaminoethylaminopropyl chain design 4-6 ).

[0053] 34.4 g D 4 Vi , 123.6g AEAPMDS, 10.8g distilled water and 0.04g TMHA catalyst were added to a three-necked flask; the reaction system was replaced with nitrogen three times to isolate oxygen, the temperature was raised to 100°C for reaction for 2h, and then raised to 150°C for reaction for 0.5h to deactivate the catalyst; the temperature was cooled to room temperature and vacuum distillation was started to remove low-boiling methanol, water and its by-products to obtain VAPSi with an actual proportion of 39.8% of methylvinyl segments and an actual proportion of 60.2% of methylaminoethylaminopropyl segments. 4-6 .

[0054] VAPSi 4-6 Add dropwise into 100 mL of deionized water and keep stirring at 25 °C until VAPSi 4-6 Completely dissolved until VAPSi 4-6 When no more dissolution occurs, the dripping is stopped, and the undissolved part is filtered to obtain a clear hydrophilic polysiloxane aqueous solution. Finally, the solution is evaporated to obtain the mass of the dissolved polysiloxane, and the solubility of the water-soluble polysiloxane is calculated by the formula.

[0055] Example 5

[0056] Preparation of water-soluble polysiloxane (VAPSi) with methyl vinyl chain design accounting for 50% and methyl aminoethyl aminopropyl chain design accounting for 50% 5-5 ).

[0057] 43g D 4 Vi , 103g AEAPMDS, 9g distilled water and 0.04g TMHA catalyst were added to a three-necked flask; nitrogen was used to replace the reaction system three times, oxygen was isolated, the temperature was raised to 100°C for reaction for 3h, and then the temperature was raised to 150°C for reaction for 0.5h to deactivate the catalyst; the temperature was lowered to room temperature, and reduced pressure distillation was started to remove low-boiling methanol, water and its by-products. VAPSi with an actual proportion of 50.3% of methyl vinyl segments and 49.7% of methylaminoethylaminopropyl segments was obtained. 5-5 .

[0058] VAPSi 5-5 Add dropwise into 100 mL of deionized water and keep stirring at 25 °C until VAPSi 5-5 Completely dissolved until VAPSi 5-5 When no more dissolution occurs, the dripping is stopped, and the undissolved part is filtered to obtain a clear hydrophilic polysiloxane aqueous solution. Finally, the solution is evaporated to obtain the mass of the dissolved polysiloxane, and the solubility of the water-soluble polysiloxane is calculated by the formula.

[0059] Example 6

[0060] Preparation of water-soluble polysiloxane (VAPSi) with methylvinyl chain accounting for 60% and methylaminoethylaminopropyl chain accounting for 40% 6-4 ).

[0061] 51.6 g D 4 Vi, 82.4g AEAPMDS, 7.2g distilled water and 0.04g TMHA catalyst were added to a three-necked flask; nitrogen was used to replace the reaction system three times, oxygen was isolated, the temperature was raised to 100°C for 4h, and then raised to 150°C for 0.5h to deactivate the catalyst; the temperature was lowered to room temperature, and reduced pressure distillation was started to remove low-boiling methanol, water and its by-products. VAPSi with an actual proportion of 41.1% of methyl vinyl segments and 58.9% of methylaminoethylaminopropyl segments was obtained. 6-4 .

[0062] Add VAPSi6-4 dropwise into 100 mL of deionized water and keep stirring at 25 °C until VAPSi 6-4 Completely dissolved until VAPSi 6-4 When no more dissolution occurs, the dripping is stopped, and the undissolved part is filtered to obtain a clear hydrophilic polysiloxane aqueous solution. Finally, the solution is evaporated to obtain the mass of the dissolved polysiloxane, and the solubility of the water-soluble polysiloxane is calculated by the formula.

[0063] Example 7

[0064] A water-soluble polysiloxane (PhAPSi1-9) was prepared in which the methylphenyl chain segment design accounted for 10% and the methylaminoethylaminopropyl chain segment design accounted for 90%.

[0065] 13.6 g D n Ph , 185.4g AEAPMDS, 16.2g distilled water and 0.08g TMHA catalyst were added to a three-necked flask; nitrogen was used to replace the reaction system three times, oxygen was isolated, the temperature was raised to 100°C for reaction for 1h, and then raised to 150°C for reaction for 0.5h to deactivate the catalyst; the temperature was lowered to room temperature, and reduced pressure distillation was started to remove low-boiling methanol, water and its by-products. PhAPSi with an actual proportion of methylphenyl chain segments of 9.8% and methylaminoethylaminopropyl chain segments of 90.2% was obtained. 1-9 .

[0066] PhAPSi 1-9 Add dropwise into 100 mL of deionized water and keep stirring at 25 °C until PhAPSi 1-9 Completely dissolved until PhAPSi 1-9 When no more dissolution occurs, the dripping is stopped, and the undissolved part is filtered to obtain a clear hydrophilic polysiloxane aqueous solution. Finally, the solution is evaporated to obtain the mass of the dissolved polysiloxane, and the solubility of the water-soluble polysiloxane is calculated by the formula.

[0067] Example 8

[0068] Preparation of water-soluble polysiloxane (PhAPSi) with methylphenyl chain design accounting for 20% and methylaminoethylaminopropyl chain design accounting for 80% 2-8 ).

[0069] 27.2 g D n Ph , 164.8g AEAPMDS, 14.4g distilled water and 0.08g TMHA catalyst were added to a three-necked flask; nitrogen was used to replace the reaction system three times, oxygen was isolated, the temperature was raised to 100°C for 2h, and then raised to 150°C for 0.5h to deactivate the catalyst; the temperature was lowered to room temperature, and reduced pressure distillation was started to remove low-boiling methanol, water and its by-products. PhAPSi with methylphenyl chain accounting for 19.6% and methylaminoethylaminopropyl chain accounting for 80.4% was obtained. 2-8 .

[0070] PhAPSi 2-8 Add dropwise into 100 mL of deionized water and keep stirring at 25 °C until PhAPSi 2-8 Completely dissolved until PhAPSi 2-8 When no more dissolution occurs, the dripping is stopped, and the undissolved part is filtered to obtain a clear hydrophilic polysiloxane aqueous solution. Finally, the solution is evaporated to obtain the mass of the dissolved polysiloxane, and the solubility of the water-soluble polysiloxane is calculated by the formula.

[0071] Example 9

[0072] Preparation of water-soluble polysiloxane (PhAPSi) with 30% methylphenyl chain design and 70% methylaminoethylaminopropyl chain design 3-7 ).

[0073] 40.8 g D n Ph , 144.2g AEAPMDS, 12.6g distilled water and 0.07g TMHA catalyst were added to a three-necked flask; nitrogen was used to replace the reaction system three times, oxygen was isolated, the temperature was raised to 100°C for reaction for 3h, and then the temperature was raised to 150°C for reaction for 0.5h to deactivate the catalyst; the temperature was lowered to room temperature, and reduced pressure distillation was started to remove low-boiling methanol, water and its by-products. PhAPSi with an actual proportion of 30.2% of methylphenyl segments and 69.8% of methylaminoethylaminopropyl segments was obtained. 3-7 .

[0074] PhAPSi 3-7 Add dropwise into 100 mL of deionized water and keep stirring at 25 °C until PhAPSi 3-7 Completely dissolved until PhAPSi 3-7When no more dissolution occurs, the dripping is stopped, and the undissolved part is filtered to obtain a clear hydrophilic polysiloxane aqueous solution. Finally, the solution is evaporated to obtain the mass of the dissolved polysiloxane, and the solubility of the water-soluble polysiloxane is calculated by the formula.

[0075] Example 10

[0076] Preparation of water-soluble polysiloxane (PhAPSi) with 40% methylphenyl chain design and 60% methylaminoethylaminopropyl chain design 4-6 ).

[0077] 54.4 g D n Ph , 123.6g AEAPMDS, 10.8g distilled water and 0.07g TMHA catalyst were added to a three-necked flask; nitrogen was used to replace the reaction system three times, oxygen was isolated, the temperature was raised to 100°C for reaction for 3h, and then the temperature was raised to 150°C for reaction for 0.5h to deactivate the catalyst; the temperature was lowered to room temperature, and reduced pressure distillation was started to remove low-boiling methanol, water and its by-products. PhAPSi with an actual proportion of 39.5% of methylphenyl chain segments and 60.5% of methylaminoethylaminopropyl chain segments was obtained. 4-6 .

[0078] PhAPSi 4-6 Add dropwise into 100 mL of deionized water and keep stirring at 25 °C until PhAPSi 4-6 Completely dissolved until PhAPSi 4-6 When no more dissolution occurs, the dripping is stopped, and the undissolved part is filtered to obtain a clear hydrophilic polysiloxane aqueous solution. Finally, the solution is evaporated to obtain the mass of the dissolved polysiloxane, and the solubility of the water-soluble polysiloxane is calculated by the formula.

[0079] Comparative Example 2:

[0080] Preparation of polysiloxane with 40% methylphenyl chain segments and 60% dimethyl chain segments (PhPSi 4-6 ).

[0081] 54.4 g D n Ph , 44.4g octamethylcyclotetrasiloxane and 0.04g TMHA catalyst were added to a three-necked flask; the reaction system was replaced with nitrogen three times, oxygen was isolated, the temperature was raised to 100℃ for reaction for 3h, and then raised to 150℃ for reaction for 0.5h to deactivate the catalyst; the temperature was lowered to room temperature and low-boiling substances were removed by vacuum distillation. PhPSi with methylphenyl chain accounting for 40.6% and dimethyl side chain accounting for 59.4% was obtained. 4-6 .

[0082] PhPSi 4-6Add dropwise into 100 mL of deionized water and keep stirring at 25 °C until PhPSi 4-6 Completely dissolved until PhPSi 4-6 When no more dissolution occurs, the dripping is stopped, and the undissolved part is filtered to obtain a clear hydrophilic polysiloxane aqueous solution. Finally, the solution is evaporated to obtain the mass of the dissolved polysiloxane, and the solubility of the water-soluble polysiloxane is calculated by the formula.

[0083] The actual proportion of polysiloxane chain segments and the 25°C solubility test results prepared in Examples 1-10 and Comparative Examples 1-2 are shown in Table 1.

[0084] Table 1 Actual chain segment ratio and solubility of polysiloxane

[0085]

[0086]

[0087] The main difference between Example 1 and Comparative Example 1 is that the polysiloxane in Example 1 contains aminoethylaminopropyl groups, while the aminoethylaminopropyl groups in Comparative Example 1 are replaced by methyl groups. The solubility of the polysiloxane in Example 1 reaches 60 g / 100 mL, which is significantly more water-soluble than that in Comparative Example 1, indicating that the introduction of aminoethylaminopropyl groups gives the polysiloxane hydrophilicity. As shown in Table 1, the solubility data of Examples 1-6 and Examples 7-10 show that when R 2 When the groups are consistent, the solubility of polysiloxane increases with the increase of aminoethylaminopropyl group content.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water-soluble polysiloxane, characterized in that: Having the structure shown in Formula I: Wherein, R1 is aminoethylaminopropyl, R2 is vinyl or phenyl, X+Y=100%, X=35%-100% and excluding 100%.

2. The water-soluble polysiloxane according to claim 1, characterized in that When R2 is a vinyl group, X=50%-100% (excluding 100%).

3. The water-soluble polysiloxane according to claim 1, characterized in that When R2 is phenyl, X=70%-100% (excluding 100%).

4. A method for preparing a water-soluble polysiloxane according to any one of claims 1 to 3, characterized in that: The following steps are involved: Silane, aminoethylaminopropylsilane, a catalyst and deionized water are mixed and reacted under an inert atmosphere, and then distilled under reduced pressure to obtain the water-soluble polysiloxane.

5. The preparation method according to claim 4, characterized in that: The silane includes at least one of tetramethyltetravinylcyclotetrasiloxane, dimethoxymethylvinylsilane, methylvinyldiethoxysilane, methylbis(trimethylsiloxy)vinylsilane, methylphenylcyclosiloxane, dimethoxymethylphenylsilane and diethoxymethylphenylsilane.

6. The preparation method according to claim 4, characterized in that: The aminoethylaminopropylsilane includes at least one of N-(β-aminoethyl-γ-aminopropyl)methyldimethoxysilane and N-(β-aminoethyl-γ-aminopropyl)methyldiethoxysilane.

7. The preparation method according to claim 4, characterized in that: The catalyst includes at least one of tetramethylammonium hydroxide, tetramethylammonium hydroxide siliconate, sodium hydroxide and potassium hydroxide.

8. The preparation method according to claim 4, characterized in that: The reaction temperature is 40°C to 200°C, and the reaction time is 0.5 to 10 hours.

9. The preparation method according to claim 4, characterized in that: The reaction is carried out in two steps, first reacting at 90°C to 110°C for 0.5 to 3 hours, and then heating to 140°C to 160°C for 0.5 to 1 hour.

10. Use of the water-soluble polysiloxane according to any one of claims 1 to 3 in water-based coatings, cosmetics, drug carriers or environmental protection fields.

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