A silicone water repellent finish and a method for its preparation

Abstract

The present application relates to the field of textile functional finishing agent, in particular to a kind of silicone waterproof finishing agent and preparation method thereof, comprising: octamethylcyclotetrasiloxane, hexamethyldisiloxane, tetramethylcyclotetrasiloxane are mixed with initiator and are reacted, and side chain hydrogen-containing silicone oil is obtained by filtration;Side chain hydrogen-containing silicone oil is mixed with 4-vinyl epoxycyclohexane and methacrylic acid ester compound, is reacted under nitrogen protection and catalyst is added to obtain modified silicone oil;Modified silicone oil is mixed with coupling agent and is reacted to obtain amino-modified silicone oil;Side chain hydrogen-containing silicone oil is mixed with allyl polyethylene glycol and is reacted to obtain non-ionic silicon-containing surfactant;Finally, amino-modified silicone oil is mixed with non-ionic silicon-containing surfactant, acid solution is added and emulsified with water to obtain silicone waterproof finishing agent.The application forms uniform and stable waterproof film on the surface of fabric by specific modified silicone oil and non-ionic silicon-containing surfactant, improves waterproof grade, and is suitable for waterproof finishing of various fabrics.

Description

Technical Field

[0001] This invention relates to the field of functional finishing agents for textiles, and in particular to an organosilicon waterproof finishing agent and its preparation method. Background Technology

[0002] With the continuous development of the textile industry, the requirements for the waterproof performance and hand feel of fabrics are increasing. Traditional waterproofing agents are mainly divided into two categories: fluorinated waterproofing agents and fluorinated-free waterproofing agents. Fluorinated waterproofing agents are widely used due to their excellent waterproof performance, but their environmental impact has attracted widespread attention. Fluorinated waterproofing agents are mainly divided into two types: C8 and C6. C8 has a better waterproof effect, but due to its potential environmental hazards, it is gradually being phased out of the market; C6 has a relatively weaker waterproof effect and is difficult to achieve ideal waterproof performance on some special fabrics.

[0003] Fluorine-free waterproofing agents mainly include acrylic and polyurethane types. While acrylic waterproofing agents are environmentally friendly, their waterproofing effect is generally average, and the finished fabrics tend to feel stiff, making it difficult to meet the demands of the high-end market. Polyurethane waterproofing agents offer better waterproofing, but they have poor breathability, tend to generate heat, are more expensive, and are prone to scratches, limiting their application range.

[0004] Furthermore, existing waterproofing agents also have shortcomings in terms of wash resistance and film-forming properties. Many waterproofing agents experience a significant decrease in waterproofing effectiveness after repeated washing, failing to meet consumers' demands for durable waterproofing. Additionally, some waterproofing agents have poor film-forming properties on fabric surfaces, affecting the fabric's appearance and feel. Summary of the Invention

[0005] To address the problems in the background art, this invention proposes an organosilicon waterproofing finishing agent and its preparation method. It uses a nonionic silicone surfactant, and the amount used is only 5-10% of the organosilicon compound. Compared with the fact that the amount of ordinary nonionic surfactant is generally 30-50% of the organosilicon compound, this not only reduces the raw material cost, but also reduces the negative impact of surfactant residue on waterproofing performance.

[0006] The technical solution adopted by this invention to solve its technical problem is: providing a method for preparing an organosilicon waterproofing finishing agent, comprising the following steps: S1, synthesizing side-chain hydrogen-containing silicone oil: mixing octamethylcyclotetrasiloxane, hexamethyldisiloxane, tetramethylcyclotetrasiloxane with a first catalyst, reacting at a set temperature, and filtering to obtain side-chain hydrogen-containing silicone oil; S2, synthesizing modified silicone oil: mixing the side-chain hydrogen-containing silicone oil obtained in S1, 4-vinylepoxycyclohexane, and methacrylate compounds, reacting under nitrogen protection, and adding a second catalyst... The catalyst yields modified silicone oil; S3, Synthesis of amino-modified silicone oil: The modified silicone oil obtained in S2 is mixed with a coupling agent and reacted at a set temperature to obtain amino-modified silicone oil; S4, Preparation of nonionic silicone surfactant: The side-chain hydrogen-containing silicone oil obtained in S1 is mixed with allyl polyethylene glycol and reacted under nitrogen protection to obtain a nonionic silicone surfactant; S5, Emulsification: The amino-modified silicone oil obtained in S3 is mixed with the nonionic silicone surfactant obtained in S4, an acid solution is added and water is added for emulsification to obtain an organosilicon waterproofing finishing agent.

[0007] Further, in step S1, the mass ratio of octamethylcyclotetrasiloxane, hexamethyldisiloxane, tetramethylcyclotetrasiloxane to the initiator is 100:(1-2):(2-20):(3-5); the first catalyst is a solid acid resin.

[0008] Furthermore, the reaction temperature in step S1 is 50-70℃, and the reaction time is 6-8 hours.

[0009] Furthermore, in step S2, the molar ratio of the side-chain hydrogen-containing silicone oil, 4-vinylepoxycyclohexane, and methacrylate compounds is 1:(4-20):(2-5); the reaction temperature is 80-100℃, and the reaction time is 4-6 hours; the second catalyst is chloroplatinic acid.

[0010] Furthermore, the methacrylate compounds are selected from dodecyl methacrylate, tetradecyl methacrylate, hexadecyl methacrylate, or octadecyl methacrylate.

[0011] Furthermore, 4-vinylepoxycyclohexane can be replaced with allyl glycidyl ether.

[0012] Further, in step S3, the coupling agent is selected from 3-aminopropyltriethoxysilane, N-(2-aminoethyl-3-aminopropyl)methyldimethoxysilane or 3-aminopropylmethyldiethoxysilane; the molar ratio of modified silicone oil to coupling agent is 1:(1.5-3); the dropping time of the coupling agent is 1-1.5 hours; the reaction temperature is 50-70℃ and the reaction time is 4-6 hours.

[0013] Furthermore, in step S4, the molecular weight of allyl polyethylene glycol is 580-700; the reaction temperature is 80-100℃; and the reaction time is 4-6 hours.

[0014] Further, in step S5, the acid solution is an 80% acetic acid solution; the mass ratio of amino-modified silicone oil, nonionic silicone surfactant and 80% acetic acid solution is 100:(5-10):(1.2-1.5).

[0015] Furthermore, an organosilicon waterproofing finishing agent is also provided, comprising: octamethylcyclotetrasiloxane, hexamethyldisiloxane, tetramethylcyclotetrasiloxane, 4-vinylepoxycyclohexane, methacrylate compounds, coupling agent, allyl polyethylene glycol, 80% acetic acid solution, a first catalyst, and a second catalyst.

[0016] The beneficial effects of this invention are:

[0017] (1) The present invention uses nonionic silicone surfactants, which are only 5-10% of the amount of organosilicon compounds. Compared with the general amount of nonionic surfactants which is 30-50% of organosilicon compounds, this reduces the cost of raw materials and reduces the negative impact of surfactant residue on waterproof performance.

[0018] (2) The organosilicon waterproofing agent of the present invention does not contain fluorine compounds, thus avoiding the potential environmental hazards of traditional fluorine-containing waterproofing agents and meeting the current environmental protection trend and market demand.

[0019] (3) By retaining some of the active epoxy groups that do not participate in the ring-opening reaction of the amino group, and by hydrolyzing the ethoxy group into hydroxyl groups and forming a network three-dimensional structure during high-temperature setting, the waterproof finishing agent of the present invention can still maintain good waterproof performance after multiple water washes, and significantly improves the water wash resistance.

[0020] (4) The organosilicon waterproofing agent of the present invention provides excellent waterproof performance while also giving the fabric a soft and comfortable feel. By introducing amino-modified silicone oil, the feel of the fabric is improved, achieving a good balance between waterproofing and feel. Detailed Implementation

[0021] The technical solutions in the embodiments of the invention will be clearly and completely described below with reference to the embodiments of the invention. It should be understood that the specific embodiments described herein are merely for explaining the invention and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts related to the invention are shown, not all the structures.

[0022] Example 1: Step S1: Synthesize hydrogen-containing silicone oil with side chain.

[0023]

[0024] As shown in the formula above, octamethylcyclotetrasiloxane, hexamethyldisiloxane, tetramethylcyclotetrasiloxane and solid acid resin are mixed in a mass ratio of 100:1.5:10:4, added to a four-necked flask, heated to 60°C, stirred and reacted for 7 hours, filtered after the reaction was completed to obtain side-chain hydrogen-containing silicone oil.

[0025] Step S2: Synthesize modified silicone oil.

[0026]

[0027] Where x≥1, y≥1, y≥a+b.

[0028] As shown in the formula above, 100g of the side-chain hydrogen-containing silicone oil obtained in step S1, 4-vinylepoxycyclohexane, and octadecyl methacrylate were added to a three-necked flask, nitrogen gas was introduced, the temperature was raised to 90℃, and chloroplatinic acid catalyst was slowly added dropwise. The reaction was carried out for 5 hours to obtain epoxy-methacrylate co-modified silicone oil. The molar ratio of the side-chain hydrogen-containing silicone oil, 4-vinylepoxycyclohexane, and methacrylate compounds was 1:12:3.

[0029] Step S3: Synthesize amino-modified silicone oil.

[0030]

[0031] As shown in the formula above, the modified silicone oil obtained in step S2 is mixed with 3-aminopropyltriethoxysilane at a molar ratio of 1:2, the dropping time of 3-aminopropyltriethoxysilane is controlled to be 1.2 hours, and the mixture is reacted at 60°C for 5 hours to obtain amino-modified silicone oil.

[0032] Step S4: Prepare a nonionic silicone surfactant.

[0033] Take 50g of the hydrogen-containing silicone oil with side chain obtained in step S1 and 30g of allyl polyethylene glycol with a molecular weight of 600, add them to the reaction vessel, heat to 90℃ under nitrogen protection, and react for 5 hours to obtain a nonionic silicone surfactant.

[0034] Step S5: Emulsification.

[0035] 100g of amino-modified silicone oil obtained in step S3, 8g of nonionic silicone surfactant obtained in step S4, and 1.3g of 80% acetic acid solution were mixed and emulsified using a high-speed shear disperser at a speed of 4000 r / min. Water was slowly added to adjust the emulsion solid content to 30% to obtain an organosilicon waterproofing finishing agent.

[0036] Example 2: Step S1: Synthesize hydrogen-containing silicone oil with side chain.

[0037] Octamethylcyclotetrasiloxane, hexamethyldisiloxane, tetramethylcyclotetrasiloxane and solid acid resin were mixed in a mass ratio of 100:1:15:3 and added to a four-necked flask. The mixture was heated to 55°C and stirred for 8 hours. After the reaction was completed, the mixture was filtered to obtain hydrogen-containing silicone oil with side chains.

[0038] Step S2: Synthesize modified silicone oil.

[0039] Take 100g of the side-chain hydrogen-containing silicone oil obtained in step S1, 4-vinylepoxycyclohexane, and hexadecyl methacrylate, add them to a three-necked flask, purge with nitrogen for protection, heat to 85℃, slowly add chloroplatinic acid catalyst, and react for 6 hours to obtain epoxy-methacrylate co-modified silicone oil. The molar ratio of the side-chain hydrogen-containing silicone oil, 4-vinylepoxycyclohexane, and methacrylate compounds is 1:8:4.

[0040] Step S3: Synthesize amino-modified silicone oil.

[0041] The modified silicone oil obtained in step S2 was mixed with N-(2-aminoethyl-3-aminopropyl)methyldimethoxysilane at a molar ratio of 1:2.5. The coupling agent was added at a time of 1.5 hours, and the mixture was reacted at 65°C for 4.5 hours to obtain amino-modified silicone oil.

[0042] Step S4: Prepare a nonionic silicone surfactant.

[0043] Take 60g of the hydrogen-containing silicone oil with side chain obtained in step S1 and 25g of allyl polyethylene glycol with a molecular weight of 580, add them to the reaction vessel, heat to 85°C under nitrogen protection, and react for 6 hours to obtain a nonionic silicone surfactant.

[0044] Step S5: Emulsification.

[0045] Mix 100g of amino-modified silicone oil obtained in step S3, 10g of nonionic silicone surfactant obtained in step S4, and 1.5g of 80% acetic acid solution. Emulsify the mixture using a high-speed shear disperser at a speed of 3500r / min. Slowly add water to adjust the emulsion solid content to 30% to obtain an organosilicon waterproofing finishing agent.

[0046] Example 3: Step S1: Synthesize hydrogen-containing silicone oil with side chain.

[0047] Octamethylcyclotetrasiloxane, hexamethyldisiloxane, tetramethylcyclotetrasiloxane and solid acid resin were mixed in a mass ratio of 100:2:5:5 and added to a four-necked flask. The mixture was heated to 70°C and stirred for 6 hours. After the reaction was completed, the mixture was filtered to obtain hydrogen-containing silicone oil with side chains.

[0048] Step S2: Synthesize modified silicone oil.

[0049] Take 100g of the side-chain hydrogen-containing silicone oil obtained in step S1, allyl glycidyl ether, and dodecyl methacrylate, add them to a three-necked flask, purge with nitrogen for protection, heat to 100℃, slowly add chloroplatinic acid catalyst, and react for 4 hours to obtain epoxy-methacrylate co-modified silicone oil. The molar ratio of the side-chain hydrogen-containing silicone oil, allyl glycidyl ether, and methacrylate compounds is 1:20:2.

[0050] Step S3: Synthesize amino-modified silicone oil.

[0051] The modified silicone oil obtained in step S2 was mixed with 3-aminopropylmethyldiethoxysilane (KH-912) at a molar ratio of 1:1.8. The coupling agent was added at a time of 1 hour, and the mixture was reacted at 70°C for 5.5 hours to obtain amino-modified silicone oil.

[0052] Step S4: Prepare a nonionic silicone surfactant.

[0053] Take 40g of the hydrogen-containing silicone oil with side chain obtained in step S1 and 35g of allyl polyethylene glycol with a molecular weight of 700, add them to the reaction vessel, heat to 100℃ under nitrogen protection, and react for 4 hours to obtain a nonionic silicone surfactant.

[0054] Step S5: Emulsification.

[0055] Mix 100g of amino-modified silicone oil obtained in step S3, 5g of nonionic silicone surfactant obtained in step S4, 1.2g of 80% acetic acid solution, and 210g of water. Emulsify the mixture for 2 hours using a high-speed shear disperser at 4500r / min. Slowly add water to adjust the emulsion solid content to 30% to obtain an organosilicon waterproofing finishing agent.

[0056] Example 4: Step S1: Synthesize side-chain hydrogen-containing silicone oil.

[0057] Octamethylcyclotetrasiloxane, hexamethyldisiloxane, tetramethylcyclotetrasiloxane and solid acid resin were mixed in a mass ratio of 100:1.8:18:3.5 and added to a four-necked flask. The mixture was heated to 65°C and stirred for 7.5 hours. After the reaction was completed, the mixture was filtered to obtain hydrogen-containing silicone oil with side chains.

[0058] Step S2: Synthesize modified silicone oil

[0059] Take 100g of the hydrogen-containing silicone oil with side chains obtained in step S1, 4-vinylepoxycyclohexane, and tetradecyl methacrylate, and add them to a three-necked flask. Under nitrogen protection, heat to 95℃, and slowly add chloroplatinic acid catalyst. React for 5.5 hours to obtain epoxy-methacrylate co-modified silicone oil. The molar ratio of the hydrogen-containing silicone oil with side chains, 4-vinylepoxycyclohexane, and methacrylate compounds is 1:15:3.5.

[0060] Step S3: Synthesize amino-modified silicone oil.

[0061] The modified silicone oil obtained in step S2 was mixed with 3-aminopropyltriethoxysilane at a molar ratio of 1:2.2, and the coupling agent was added at a time of 1.3 hours. The mixture was then reacted at 55°C for 6 hours to obtain amino-modified silicone oil.

[0062] Step S4: Prepare a nonionic silicone surfactant.

[0063] Take 55g of the hydrogen-containing silicone oil with side chains obtained in step S1 and 28g of allyl polyethylene glycol with a molecular weight of 650, and add them to a reaction vessel. Under nitrogen protection, heat to 95℃ and react for 5.5 hours to obtain a nonionic silicone surfactant.

[0064] Step S5: Emulsification.

[0065] Mix 100g of amino-modified silicone oil obtained in step S3, 7g of nonionic silicone surfactant obtained in step S4, 1.4g of 80% acetic acid solution, and 240g of water. Emulsify for 2.2 hours using a high-speed shear disperser at 3800 r / min, and slowly add water to adjust the emulsion solid content to 30% to obtain an organosilicon waterproofing finishing agent.

[0066] Example 5: Step S1: Synthesize hydrogen-containing silicone oil with side chain.

[0067] Octamethylcyclotetrasiloxane, hexamethyldisiloxane, tetramethylcyclotetrasiloxane and solid acid resin were mixed in a mass ratio of 100:1.2:8:4.5 and added to a four-necked flask. The mixture was heated to 58°C and stirred for 8 hours. After the reaction was completed, the mixture was filtered to obtain hydrogen-containing silicone oil with side chains.

[0068] Step S2: Synthesize modified silicone oil.

[0069] Take 100g of the hydrogen-containing silicone oil with side chains obtained in step S1, 4-vinylepoxycyclohexane, and octadecyl methacrylate, and add them to a three-necked flask. Under nitrogen protection, heat to 88℃, and slowly add chloroplatinic acid catalyst. React for 5.5 hours to obtain epoxy-methacrylate co-modified silicone oil. The molar ratio of the hydrogen-containing silicone oil with side chains, 4-vinylepoxycyclohexane, and methacrylate compounds is 1:18:4.5.

[0070] Step S3: Synthesize amino-modified silicone oil.

[0071] The modified silicone oil obtained in step S2 was mixed with 3-aminopropylmethyldiethoxysilane at a molar ratio of 1:2.8, and the coupling agent was added at a time of 1.4 hours. The mixture was then reacted at 68°C for 4.8 hours to obtain amino-modified silicone oil.

[0072] Step S4: Prepare a nonionic silicone surfactant.

[0073] Take 48g of the hydrogen-containing silicone oil with side chain obtained in step S1 and 32g of allyl polyethylene glycol with a molecular weight of 680, add them to the reaction vessel, heat to 92°C under nitrogen protection, and react for 4.8 hours to obtain a nonionic silicone surfactant.

[0074] Step S5: Emulsification.

[0075] Mix 100g of amino-modified silicone oil obtained in step S3, 9g of nonionic silicone surfactant obtained in step S4, 1.1g of 80% acetic acid solution, and 220g of water. Emulsify for 2.3 hours using a high-speed shear disperser at 4200r / min. Slowly add water to adjust the emulsion solid content to 30% to obtain an organosilicon waterproofing finishing agent.

[0076] Example 6: Step S1: Synthesize hydrogen-containing silicone oil with side chain.

[0077] Octamethylcyclotetrasiloxane, hexamethyldisiloxane, tetramethylcyclotetrasiloxane, and solid acid resin were mixed in a mass ratio of 100:1.7:12:3.8 and added to a four-necked flask. The mixture was heated to 62°C and stirred for 7.2 hours. After the reaction was completed, the mixture was filtered to obtain hydrogen-containing silicone oil with side chains.

[0078] Step S2: Synthesize modified silicone oil.

[0079] Take 100g of the side-chain hydrogen-containing silicone oil obtained in step S1, allyl glycidyl ether, and hexadecyl methacrylate, and add them to a three-necked flask. Under nitrogen protection, heat to 93℃, and slowly add chloroplatinic acid catalyst (0.05% of the total mass). React for 5.2 hours to obtain epoxy-methacrylate co-modified silicone oil. The molar ratio of the side-chain hydrogen-containing silicone oil, allyl glycidyl ether, and methacrylate compounds is 1:10:4.

[0080] Step S3: Synthesize amino-modified silicone oil.

[0081] The modified silicone oil obtained in step S2 was mixed with N-(2-aminoethyl-3-aminopropyl)methyldimethoxysilane at a molar ratio of 1:2.3. The coupling agent was added at a time of 1.1 hours, and the mixture was reacted at 63°C for 5.8 hours to obtain amino-modified silicone oil.

[0082] Step S4: Prepare a nonionic silicone surfactant.

[0083] Take 53g of the hydrogen-containing silicone oil with side chain obtained in step S1 and 29g of allyl polyethylene glycol with a molecular weight of 620, add them to the reaction vessel, heat to 87°C under nitrogen protection, and react for 5.3 hours to obtain a nonionic silicone surfactant.

[0084] Step S5: Emulsification.

[0085] 100g of amino-modified silicone oil obtained in step S3, 6g of nonionic silicone surfactant obtained in step S4, 1.3g of 80% acetic acid solution, and 235g of water were mixed and emulsified for 2.1 hours using a high-speed shear disperser at a speed of 3900r / min. Water was then slowly added to adjust the emulsion solid content to 30% to obtain an organosilicon waterproofing finishing agent.

[0086] Performance test example:

[0087] (1) Water repellency test method:

[0088] Referring to the AATCC 22-2005 "Water Repellency Test: Spray Method", take a piece of treated fabric sample, clamp it taut with a holder, and place it at a 45° angle so that the warp of the fabric follows the direction of water droplet flow down the fabric surface. The center of the test surface is 15 cm below the center of the nozzle surface. Spray the fabric surface with the nozzle over 25-30 seconds. After spraying, remove the holder and place the fabric horizontally. Evaluate the test fabric against the rating standard.

[0089] (2) Hand feel test method

[0090] Groups of 5-8 people were asked to compare the softness of the treated cotton fabric by touching it with their eyes closed. The softness was scored from 1 to 5 points. The test was conducted three times and the average value was selected.

[0091]

[0092] The silicone waterproofing agent provided by this invention exhibits superior performance advantages in performance tests. At a dosage of 30 grams per liter on cotton fabrics and 10 grams per liter on polyester fabrics, this silicone waterproofing agent achieves excellent initial waterproofing effects, with water repellency scores exceeding 83 points. The initial waterproofing score for polyester fabrics reaches as high as 92 points, exceeding the level of conventional fluorine-free waterproofing agents. It also possesses wash resistance; after 10 washes, the water repellency of cotton fabrics remains stable at above 73 points, reaching a maximum of 77 points, while that of polyester fabrics remains above 85 points, reaching a maximum of 87 points, effectively solving the pain point of insufficient durability of traditional waterproofing agents. While imparting high-level waterproofing performance to fabrics, this finishing agent, through the synergistic effect of amino-modified silicone oil, makes the finished fabrics soft and comfortable to the touch. The hand feel score for cotton fabrics generally reaches above 4 points, successfully overcoming the problem of a stiff hand feel caused by polyurethane-based waterproofing agents. Furthermore, this technology has broad fiber applicability and can achieve highly effective waterproofing at low application concentrations, significantly reducing processing costs. Its environmental characteristics are particularly outstanding. By innovatively using silicone-containing surfactants, the amount used is only 5% to 10% of that of organosilicon compounds, far lower than the 30% to 50% of conventional surfactants. This not only reduces raw material costs and residual impacts, but also avoids the environmental risks of fluorinated waterproofing agents by being free of fluorinated compounds throughout the process. It provides a high-performance and sustainable solution for the development of green textiles.

[0093] The present invention has been described in detail above with reference to embodiments and comparative examples. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. All contents not described in detail in the present invention can be derived from existing technologies.

Claims

1. A method for preparing an organosilicon waterproofing agent, characterized in that, Includes the following steps: S1. Synthesis of side-chain hydrogen-containing silicone oil: Octamethylcyclotetrasiloxane, hexamethyldisiloxane, tetramethylcyclotetrasiloxane are mixed with the first catalyst, reacted at a set temperature, and then filtered to obtain side-chain hydrogen-containing silicone oil. S2. Synthesis of modified silicone oil: The side-chain hydrogen-containing silicone oil obtained in S1, 4-vinylepoxycyclohexane and methacrylate compounds are mixed and reacted under nitrogen protection. A second catalyst is added to obtain modified silicone oil. S3. Synthesis of amino-modified silicone oil: The modified silicone oil obtained in S2 is mixed with a coupling agent and reacted at a set temperature to obtain amino-modified silicone oil; S4. Preparation of nonionic silicone surfactant: The side-chain hydrogen-containing silicone oil obtained in S1 is mixed with allyl polyethylene glycol and reacted under nitrogen protection to obtain a nonionic silicone surfactant. S5. Emulsification: The amino-modified silicone oil obtained in S3 is mixed with the nonionic silicone surfactant obtained in S4, an acid solution is added and water is added for emulsification to obtain an organosilicon waterproofing finishing agent.

2. The method for preparing an organosilicon waterproofing agent according to claim 1, characterized in that: In step S1, the mass ratio of octamethylcyclotetrasiloxane, hexamethyldisiloxane, tetramethylcyclotetrasiloxane to the initiator is 100:(1-2):(2-20):(3-5); the first catalyst is a solid acid resin.

3. A method for preparing an organosilicon waterproofing agent according to claim 2, characterized in that: The reaction temperature in step S1 is 50-70℃, and the reaction time is 6-8 hours.

4. A method for preparing an organosilicon waterproofing agent according to claim 1, characterized in that: In step S2, the molar ratio of side-chain hydrogen-containing silicone oil, 4-vinylepoxycyclohexane, and methacrylate compounds is 1:(4-20):(2-5); the reaction temperature is 80-100℃, and the reaction time is 4-6 hours; the second catalyst is chloroplatinic acid.

5. A method for preparing an organosilicon waterproofing agent according to claim 4, characterized in that: Methacrylate compounds include dodecyl methacrylate, tetradecyl methacrylate, hexadecyl methacrylate, or octadecyl methacrylate.

6. A method for preparing an organosilicon waterproofing agent according to claim 5, characterized in that: 4-Vinylepoxycyclohexane can be replaced with allyl glycidyl ether.

7. A method for preparing an organosilicon waterproofing agent according to claim 1, characterized in that: In step S3, the coupling agent includes 3-aminopropyltriethoxysilane, N-(2-aminoethyl-3-aminopropyl)methyldimethoxysilane, or 3-aminopropylmethyldiethoxysilane; the molar ratio of modified silicone oil to coupling agent is 1:(1.5-3); the dropping time of the coupling agent is 1-1.5 hours; the reaction temperature is 50-70℃, and the reaction time is 4-6 hours.

8. A method for preparing an organosilicon waterproofing agent according to claim 1, characterized in that: In step S4, the molecular weight of allyl polyethylene glycol is 580-700; the reaction temperature is 80-100℃; and the reaction time is 4-6 hours.

9. A method for preparing an organosilicon waterproofing agent according to claim 1, characterized in that: In step S5, the acid solution is an 80% acetic acid solution; the mass ratio of amino-modified silicone oil, nonionic silicone surfactant, and 80% acetic acid solution is 100:(5-10):(1.2-1.5).

10. An organosilicon waterproofing agent prepared using the preparation method of the organosilicon waterproofing agent according to any one of claims 1-9, characterized in that, include: Octamethylcyclotetrasiloxane, hexamethyldisiloxane, tetramethylcyclotetrasiloxane, 4-vinylepoxycyclohexane, methacrylate compounds, coupling agents, allyl polyethylene glycol, 80% acetic acid solution, first catalyst and second catalyst.

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