Device and method for synthesizing silica sol modified acrylate composite emulsion

Abstract

The invention discloses a synthesis device and a synthesis method of silica sol modified acrylate composite emulsion. According to the preparation method disclosed by the invention, the organic silicon coupling agent containing double bonds is introduced as a bridging agent and is subjected to a bonding reaction with the surface of the silica sol before polymerization, so that the silica sol and the acrylate monomer form a chemical cross-linked structure, and the phase separation problem of a traditional physical blending method is solved. Meanwhile, gelation caused by high-temperature mixing is avoided through a step-by-step pre-emulsification process, silica sol is uniformly dispersed in a polymer network, the uniformity and long-term storage stability of the emulsion are greatly improved, the stability and compatibility of the composite emulsion are remarkably improved, one-step in-situ modification is adopted to replace a complex surface pretreatment step, and the preparation process is simple and convenient. The tedious process of a traditional surface modification method is omitted; the temperature, pH and stirring parameters are accurately regulated and controlled through the device control box body, generation of by-products caused by fluctuation of reaction conditions is avoided, and waste of raw materials is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a synthesis device and a synthesis method of a silica sol modified acrylate composite emulsion. Background Art

[0002] In recent years, silica sol-modified acrylate composite emulsions have been widely used in the fields of high-end coatings and adhesives due to their excellent weather resistance, mechanical properties and chemical stability. Traditional acrylate emulsions are mainly prepared by emulsion polymerization, but they have problems such as poor stability and insufficient water resistance. The introduction of silica sol can significantly improve these properties, but the compatibility of silica sol and acrylate monomers in the existing technology is poor, which makes the composite emulsion prone to phase separation, affecting the uniformity and performance of the final product. At present, the industry mainly attempts to solve this problem through physical blending or in situ polymerization, but the effect is limited. Common solutions include: (1) physical blending method: simply mixing pre-prepared silica sol with acrylate emulsion; (2) in situ polymerization method: adding silica sol during the polymerization process of acrylate emulsion and promoting the combination of the two through initiator; (3) surface modification method: organically modifying the surface of silica sol and then copolymerizing with acrylate monomer.

[0003] However, common solutions have the following disadvantages: physical blending method has poor product stability and is prone to phase separation; in-situ polymerization method has difficult to control reaction conditions and is prone to produce by-products; surface modification method has cumbersome process, high production cost, and the modification effect is limited by the number of active sites on the silica sol surface. Summary of the Invention The purpose of the present invention is to provide a synthesis device and a synthesis method for a silica sol-modified acrylate composite emulsion in order to solve the above-mentioned problems.

[0004] The technical solution adopted by the present invention is as follows: a method for synthesizing a silica sol-modified acrylate composite emulsion, comprising the following steps: S1: After weighing all the raw materials, add silica sol and γ-methacryloxypropyltrimethoxysilane KH570 into the device body through the feeding port, start the stirring motor, and use the device control box to control the pre-reaction at 60°C for 1 hour to generate modified silica sol.

[0005] S2: Deionized water is added to the device body from the feed port, and then nonionic emulsifier OP10 and anionic emulsifier sodium lauryl sulfate SDS are added, and the mixture is fully stirred by the stirring motor to form an emulsifier aqueous solution.

[0006] S3: Add the modified silica sol generated in S1 into the device body through the feeding port, and start the stirring motor for pre-emulsification for 20 minutes.

[0007] S4: Methyl methacrylate (MMA), butyl acrylate (BA) and acrylic acid (AA) are mixed and slowly added into the device body through the feed port. The stirring motor continuously emulsifies for 30 minutes to form a monomer pre-emulsion.

[0008] S5: Add sodium bicarbonate solution from the feed port, and use the device control box to monitor and adjust the pH to the range of 7.5-8.5.

[0009] S6: The temperature inside the device body is raised to 75°C through the device control box body, and the stirring motor maintains uniform stirring.

[0010] S7: Slowly drip the ammonium persulfate (APS) aqueous solution into the device body through the feeding port for 1 hour, and stir the motor to maintain uniform mixing.

[0011] S8: After the dropwise addition is completed, the device controls the box body to maintain a temperature of 75° C. for 4 hours. After cooling, the device body is fixed on a mounting frame and filtered to obtain a composite emulsion.

[0012] In step S1, all raw materials include: Acrylate monomer mixture: Methyl methacrylate (MMA): 40 parts by weight; Butyl acrylate (BA): 35 parts by weight; Acrylic acid (AA): 2 parts by weight; Silica sol modified mixture: 15 parts by weight of silica sol (SiO2 solid content 30%); 3 parts by weight of γ-methacryloxypropyltrimethoxysilane (KH-570); Emulsified mixture: 1.5 parts by weight of nonionic emulsifier (OP-10); Anionic emulsifier (sodium lauryl sulfate, SDS): 1.0 parts by weight; Initiating mixture: 0.5 parts by weight of ammonium persulfate (APS); Auxiliary mixture: 0.3 parts by weight of sodium bicarbonate (NaHCO3); Deionized water: 100 parts by weight In a preferred embodiment, in step S1, silica sol and gamma-methacryloxypropyltrimethoxysilane (KH570) are added to the device body through the feed port in a proportional ratio. The stirring motor is activated at a constant speed of 300 rpm to mix the materials. The reaction temperature is precisely set to 60 degrees Celsius via the device control box and maintained for 60 minutes. This process causes the methoxy groups in KH570 to hydrolyze and react with the silanol groups on the surface of the silica sol, generating an organosilicon-modified silica sol.

[0013] In a preferred embodiment, in step S2, deionized water is added to the apparatus body, followed by the nonionic emulsifier OP10 and the anionic emulsifier sodium lauryl sulfate (SDS). The stirring motor is continuously operated at 400 rpm for 15 minutes to ensure that the emulsifiers are fully dissolved and a uniform, transparent emulsifier aqueous solution is formed.

[0014] In a preferred embodiment, in step S3, the modified silica sol produced in step S1 is slowly injected into the emulsifier aqueous solution in the apparatus body through the feed port. The stirring motor is adjusted to 350 rpm, and pre-emulsification treatment is performed for 20 minutes to uniformly disperse the silica sol particles in the system and avoid local aggregation.

[0015] In a preferred embodiment, in step S4, methyl methacrylate (MMA), butyl acrylate (BA), and acrylic acid (AA) are premixed in a uniform ratio and added dropwise to the apparatus body through a feed port at a constant flow rate. The stirring motor is maintained at 380 rpm, and emulsification is continued for 30 minutes to form a monomer pre-emulsion with a narrow particle size distribution.

[0016] In a preferred embodiment, in step S5, sodium bicarbonate is dissolved in a fixed amount of deionized water and added to the device body through the feed port. The pH value of the system is monitored in real time by the device control box, and the pH is precisely controlled within the range of 7.5 to 8.5 using a trace amount of acid-base regulator to ensure the stability of the subsequent polymerization reaction.

[0017] In a preferred embodiment, in step S6, the system temperature is raised to 75°C at a rate of 2°C per minute by a device controlling the box. The stirring motor is adjusted to a constant speed of 300 rpm, and the temperature and stirring intensity are maintained constant for 10 minutes to create a stable environment for the addition of the initiator.

[0018] In a preferred embodiment, in step S7, ammonium persulfate (APS) is dissolved in deionized water to a 5% concentration and then added dropwise to the apparatus body through the feed port at a constant flow rate of 20 ml / min. The addition process is strictly limited to 60 minutes, and the stirring motor is operated at 320 rpm to ensure uniform diffusion of the initiator throughout the system.

[0019] In a preferred embodiment, in step S8, after the dropwise addition is completed, the device controls the box to maintain a constant temperature of 75 degrees Celsius, and the reaction continues for 240 minutes. The stirring motor is operated at 280 revolutions per minute. After the reaction system is naturally cooled to 25 degrees Celsius, the device body is fixed with a mounting frame and vacuum filtered to obtain a homogeneous composite emulsion with a solid content of 45% and a particle size of 120 nanometers.

[0020] In a preferred embodiment, a synthesis device for silica sol-modified acrylate composite emulsion is internally provided with a device body, a device control box, a feeding port, a stirring motor and a mounting frame.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, a double-bonded organosilicon coupling agent is introduced as a bridging agent, which undergoes a bonding reaction with the silica sol surface before polymerization, forming a chemically cross-linked structure between the silica sol and the acrylate monomer. This completely solves the phase separation problem of traditional physical blending methods. Furthermore, the step-by-step pre-emulsification process avoids gelation caused by high-temperature mixing, allowing the silica sol to be evenly dispersed in the polymer network, significantly improving the emulsion's uniformity and long-term storage stability, and significantly enhancing the stability and compatibility of the composite emulsion.

[0022] 2. This method uses a one-step in-situ modification process, replacing complex surface pretreatment steps, eliminating the cumbersome procedures of traditional surface modification methods. A device-controlled cartridge precisely regulates temperature, pH, and stirring parameters, avoiding the formation of byproducts caused by fluctuating reaction conditions and reducing raw material waste. The entire method is simple to operate and features a high level of equipment integration. While improving the product's mechanical strength and weatherability, it is also more suitable for large-scale continuous production, simplifying the production process and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the device structure of the present invention; Figure 2 It is a schematic diagram of the principle of the generation process of the present invention.

[0024] Markings in the figure: 1-device body, 2-device control box, 3-feeding port, 4-stirring motor, 5-mounting frame. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] Example: Reference Figure 1-2 , A method for synthesizing a silica sol-modified acrylate composite emulsion, the method comprising the following steps: S1: Preparation of modified silica sol: Accurately weigh the silica sol and γ-methacryloxypropyltrimethoxysilane (KH570) and add them to the device through the feed port. Start the stirring motor at 300 rpm to mix the materials. Use the device's control box to precisely control the temperature at 60°C. The pre-reaction lasts for 60 minutes, causing the methoxy groups in KH570 to hydrolyze and form stable chemical bonds with the silanol groups on the silica sol's surface, producing a uniform organosilicon-modified silica sol, which provides a compatible foundation for subsequent compounding.

[0027] S2: Preparation of emulsifier aqueous solution: A fixed amount of deionized water was injected into the main body of the device through the feed port. The nonionic emulsifier OP10 and the anionic emulsifier sodium dodecyl sulfate (SDS) were then added in sequence. The stirring motor was run continuously at 400 rpm for 15 minutes to ensure that the emulsifiers were completely dissolved and dispersed, forming a transparent, uniform aqueous solution of the emulsifier, creating a stable dispersion environment for the subsequent monomer emulsification.

[0028] S3: Modified silica sol pre-dispersion: The modified silica sol generated in S1 was slowly injected into the emulsifier aqueous solution in the main body of the device through the feed port. The stirring motor was adjusted to 350 rpm and pre-emulsification was carried out for 20 minutes to fully disperse the modified silica sol particles in the aqueous phase, avoid local aggregation, and form a stable silica sol-emulsifier dispersion system.

[0029] S4: Preparation of monomer pre-emulsion: Methyl methacrylate (MMA), butyl acrylate (BA), and acrylic acid (AA) were premixed in appropriate proportions and added dropwise to the main unit through the feed port at a constant flow rate. The stirring motor was maintained at 380 rpm, and emulsification was continued for 30 minutes to uniformly refine the monomer droplets within the system, forming a monomer pre-emulsion with a narrow particle size distribution and excellent stability.

[0030] S5: Precise pH control: Sodium bicarbonate is dissolved in a fixed amount of deionized water and added to the main body of the device through the feed port. The pH value of the system is monitored in real time by the device control box, and a trace amount of acid-base regulator is used to precisely stabilize the pH within the range of 7.5–8.5. This step ensures that the polymerization reaction proceeds in a weakly alkaline environment, avoiding side reactions caused by acidic conditions and ensuring the stability of the emulsion.

[0031] S6: System temperature rise and stabilization: The temperature of the system was raised to 75°C at a rate of 2°C / min through the device control box. The stirring motor was adjusted to a constant speed of 300 rpm. The temperature and stirring intensity were maintained constant for 10 minutes to allow the system to reach thermal equilibrium and provide a stable reaction environment for the addition of the initiator.

[0032] S7: Adding initiator and starting the reaction: Ammonium persulfate (APS) was dissolved in deionized water to a 5% concentration and added dropwise to the device through the feed port at a constant flow rate of 20 ml / min. The addition process was strictly controlled to be completed within 60 minutes, with the stirring motor running at 320 rpm to ensure uniform diffusion of the initiator and initiate free radical polymerization.

[0033] S8: Constant temperature reaction and product post-processing: After the addition is complete, the device controls the box to maintain a constant temperature of 75°C for 240 minutes. The stirring motor runs at 280 rpm to ensure the polymerization reaction proceeds fully. After the reaction is completed, the mixture is naturally cooled to 25°C. The device is then fixed to the mounting frame and vacuum filtered to produce a homogeneous composite emulsion with a solids content of 45% and a particle size of approximately 120 nanometers. This emulsion can be directly used in the production of high-end water-based coatings and adhesives.

[0034] In step S1, all raw materials include: Acrylate monomer mixture: Methyl methacrylate (MMA): 40 parts by weight; Butyl acrylate (BA): 35 parts by weight; Acrylic acid (AA): 2 parts by weight; Silica sol modified mixture: 15 parts by weight of silica sol (SiO2 solid content 30%); 3 parts by weight of γ-methacryloxypropyltrimethoxysilane (KH-570); Emulsified mixture: 1.5 parts by weight of nonionic emulsifier (OP-10); Anionic emulsifier (sodium lauryl sulfate, SDS): 1.0 parts by weight; Initiating mixture: 0.5 parts by weight of ammonium persulfate (APS); Auxiliary mixture: 0.3 parts by weight of sodium bicarbonate (NaHCO3); Deionized water: 100 parts by weight.

[0035] In step S1, silica sol and gamma-methacryloxypropyltrimethoxysilane (KH570) are added to the device through the feed port in a proportional ratio. The stirring motor is activated at a constant speed of 300 rpm to mix the materials. The reaction temperature is precisely set to 60 degrees Celsius via the device's control box and maintained for 60 minutes. This process causes the methoxy groups in KH570 to hydrolyze and react with the silanol groups on the surface of the silica sol, forming an organosilicon-modified silica sol.

[0036] In step S2, deionized water was added to the main body of the apparatus, followed by the nonionic emulsifier OP10 and the anionic emulsifier sodium lauryl sulfate (SDS). The stirring motor was operated at 400 rpm for 15 minutes to ensure that the emulsifiers were fully dissolved and formed a uniform, transparent aqueous solution.

[0037] In step S3, the modified silica sol produced in step S1 is slowly injected into the emulsifier aqueous solution in the apparatus body through the feed port. The stirring motor is adjusted to 350 rpm and pre-emulsification is performed for 20 minutes to uniformly disperse the silica sol particles in the system and avoid local aggregation.

[0038] In step S4, methyl methacrylate (MMA), butyl acrylate (BA), and acrylic acid (AA) were premixed in a uniform ratio and added dropwise to the apparatus through the feed port at a constant flow rate. The stirring motor was maintained at 380 rpm, and emulsification was continued for 30 minutes to form a monomer pre-emulsion with a narrow particle size distribution.

[0039] In step S5, sodium bicarbonate is dissolved in a fixed amount of deionized water and added to the device body through the feed port. The device control box monitors the pH value of the system in real time, and a trace amount of acid-base regulator is used to accurately control the pH within the range of 7.5 to 8.5 to ensure the stability of the subsequent polymerization reaction.

[0040] In step S6, the system temperature was raised to 75°C at a rate of 2°C per minute using the device to control the box. The stirring motor was adjusted to a constant speed of 300 rpm, and the temperature and stirring intensity were maintained constant for 10 minutes to create a stable environment for the addition of the initiator.

[0041] In step S7, ammonium persulfate (APS) is dissolved in deionized water to a 5% concentration. This solution is then added dropwise to the device through the feed port at a constant flow rate of 20 ml / min. The addition is strictly limited to 60 minutes, with the stirring motor running at 320 rpm to ensure uniform diffusion of the initiator throughout the system.

[0042] In step S8, after the addition was complete, the device controlled the box to maintain a constant temperature of 75 degrees Celsius for 240 minutes. The stirring motor was operated at 280 revolutions per minute. After the reaction system naturally cooled to 25 degrees Celsius, the device body was fixed with a mounting frame and vacuum filtered to obtain a homogeneous composite emulsion with a solids content of 45% and a particle size of 120 nanometers.

[0043] A device for synthesizing a silica sol-modified acrylate composite emulsion, wherein the device synthesizes the silica sol-modified acrylate composite emulsion using the method for synthesizing a silica sol-modified acrylate composite emulsion according to any one of claims 1 to 9; The synthesis device is internally provided with a device body (1), a device control box (2), a feeding port (3), a stirring motor (4) and a mounting frame (5).

[0044] From the above we can know: In the present invention, the stability and compatibility of the composite emulsion are significantly improved: This invention introduces a double-bonded organosilicon coupling agent (such as KH570) as a chemical bridging agent. During the pre-reaction stage, it bonds with the active silanol groups on the surface of the silica sol, forming a stable "silica sol-coupling agent" composite structure. This chemical bonding mechanism enables the silica sol to participate in the subsequent copolymerization reaction via the double bonds during the acrylate polymerization process, forming a uniform "inorganic-organic" crosslinked network. This completely solves the phase separation and demixing problems caused by insufficient mechanical mixing in traditional physical blending methods. Furthermore, a step-by-step pre-emulsification process is employed: the modified silica sol and the emulsifier are pre-dispersed to form a stable system, and then the monomers are added in stages for emulsification. This effectively avoids the risk of localized gelation caused by direct mixing at high temperatures in in-situ polymerization methods. This design ensures uniform dispersion of the silica sol nanoparticles within the polymer network, significantly improving the emulsion's uniformity, long-term storage stability, and mechanical strength of the formed film. This ensures that the product meets high industrial standards for key properties such as weather resistance, flexibility, and adhesion.

[0045] 2. Optimize production process and reduce overall costs: This method replaces the complex silica sol pretreatment process (such as silanization and centrifugal purification) in traditional surface modification methods with a one-step in-situ modification, eliminating the need for additional equipment and hours of labor, significantly simplifying the operation steps. Core parameters such as temperature, pH value, and stirring speed are monitored and precisely controlled in real time through an integrated device (such as a device control box): Temperature control: The temperature difference during the entire reaction process is ≤±1℃ to avoid side reactions caused by high temperature fluctuations; pH control: A weakly alkaline environment (pH 7.5–8.5) is dynamically maintained by a sodium bicarbonate buffer system to prevent acidic conditions from causing emulsion demulsification; Mixing optimization: Adjust the speed in stages (300–400 rpm) to ensure uniform mixing of the materials without mechanical shear damage.

[0046] This precise control reduces byproduct generation and raw material waste, lowering wastewater treatment by 30%. The entire process is completed within a single, enclosed unit, offering highly integrated equipment and standardized operational procedures. This eliminates the need for highly skilled personnel, ensuring consistent product quality while increasing production efficiency by 40%, providing reliable support for large-scale, continuous production.

[0047] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further limitations, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for synthesizing a silica sol-modified acrylate composite emulsion, characterized in that: The synthesis method comprises the following steps: S1: After weighing all the raw materials, add silica sol and γ-methacryloxypropyltrimethoxysilane KH570 into the device body through the feeding port, start the stirring motor, and use the device control box to control the pre-reaction at 60°C for 1 hour to generate modified silica sol; S2: Add deionized water to the device body from the feed port, then add nonionic emulsifier OP10 and anionic emulsifier sodium lauryl sulfate SDS, and stir thoroughly with a stirring motor to form an emulsifier aqueous solution; S3: Add the modified silica sol generated in S1 into the device body through the feeding port, start the stirring motor and pre-emulsify for 20 minutes; S4: Methyl methacrylate (MMA), butyl acrylate (BA) and acrylic acid (AA) were mixed and slowly added to the main body of the device through the feed port. The stirring motor continued emulsification for 30 minutes to form a monomer pre-emulsion. S5: Add sodium bicarbonate solution from the feed port, and use the device control box to monitor and adjust the pH to the range of 7.5-8.5; S6: The temperature inside the device body is raised to 75°C through the device control box body, and the stirring motor maintains uniform stirring; S7: slowly drip the ammonium persulfate (APS) aqueous solution into the device body through the feeding port for 1 hour, and stir the motor to maintain uniform mixing; S8: After the dropwise addition is completed, the device controls the box body to maintain a temperature of 75° C. for 4 hours, and after cooling, the device body is fixed on the mounting frame and filtered to obtain a composite emulsion; In step S1, all raw materials include: Acrylate monomer mixture: Methyl methacrylate: 40 parts by weight; Butyl acrylate: 35 parts by weight; Acrylic acid: 2 parts by weight; Silica sol modified mixture: 15 parts by weight of silica sol with a SiO2 solid content of 30%; 3 parts by weight of γ-methacryloxypropyltrimethoxysilane; Emulsified mixture: Nonionic emulsifier OP-10: 1.5 parts by weight; Anionic emulsifier: sodium lauryl sulfate, SDS: 1.0 parts by weight; Initiating mixture: 0.5 parts by weight of ammonium persulfate; Auxiliary mixture: 0.3 parts by weight of sodium bicarbonate; Deionized water: 100 parts by weight.

2. The method for synthesizing a silica sol-modified acrylate composite emulsion according to claim 1, wherein: In step S1, silica sol and gamma-methacryloxypropyltrimethoxysilane KH570 are added to the device body through the feed port in proportion; the stirring motor is started at a constant speed of 300 revolutions per minute to mix the materials; and the reaction temperature is precisely set to 60 degrees Celsius through the device control box and maintained for 60 minutes.

3. The method for synthesizing a silica sol-modified acrylate composite emulsion according to claim 1, wherein: In step S2, deionized water is added to the main body of the device, and nonionic emulsifier OP10 and anionic emulsifier sodium lauryl sulfate SDS are added in sequence; the stirring motor is continuously operated at a speed of 400 rpm for 15 minutes.

4. The method for synthesizing a silica sol-modified acrylate composite emulsion according to claim 1, wherein: In step S3, the modified silica sol generated in step S1 is slowly injected into the emulsifier aqueous solution in the device body through the feeding port; the stirring motor is adjusted to a speed of 350 revolutions per minute, and the pre-emulsification treatment is carried out for 20 minutes.

5. The method for synthesizing a silica sol-modified acrylate composite emulsion according to claim 1, wherein: In step S4, methyl methacrylate (MMA), butyl acrylate (BA) and acrylic acid (AA) are pre-mixed uniformly according to a ratio and added dropwise to the device body through the feed port at a constant flow rate; the stirring motor is maintained at a speed of 380 revolutions per minute, and emulsification is continued for 30 minutes.

6. The method for synthesizing a silica sol-modified acrylate composite emulsion according to claim 1, wherein: In step S5, sodium bicarbonate is dissolved in a fixed amount of deionized water and added to the device body through the feed port; the pH value of the system is monitored in real time by the device control box, and the pH is accurately controlled within the range of 7.5 to 8.5 using a trace amount of acid-base regulator.

7. The method for synthesizing a silica sol-modified acrylate composite emulsion according to claim 1, wherein: In step S6, the device controls the box to raise the system temperature to 75 degrees Celsius at a rate of 2 degrees Celsius per minute; the stirring motor is adjusted to a constant speed of 300 revolutions per minute, and the temperature and stirring intensity are maintained constant for 10 minutes.

8. The method for synthesizing a silica sol-modified acrylate composite emulsion according to claim 1, wherein: In step S7, ammonium persulfate (APS) is dissolved in deionized water to prepare a 5% concentration solution, which is then added dropwise to the device body through the feed port at a flow rate of 20 ml per minute. The addition process is strictly limited to be completed within 60 minutes, and the stirring motor is operated at a speed of 320 revolutions per minute.

9. The method for synthesizing a silica sol-modified acrylate composite emulsion according to claim 1, wherein: In step S8, after the dropwise addition is completed, the device controls the box body to maintain a constant temperature environment of 75 degrees Celsius and the reaction continues for 240 minutes; the stirring motor operates at a speed of 280 revolutions per minute; after the reaction system is naturally cooled to 25 degrees Celsius, the device body is fixed by a mounting frame for vacuum filtration to obtain a homogeneous composite emulsion with a solid content of 45% and a particle size of 120 nanometers.

10. A synthesis device for silica sol-modified acrylate composite emulsion, characterized in that: The synthesis device uses the synthesis method of the silica sol-modified acrylate composite emulsion according to any one of claims 1 to 9 to synthesize the silica sol-modified acrylate composite emulsion; The synthesis device is internally provided with a device body (1), a device control box (2), a feeding port (3), a stirring motor (4) and a mounting frame (5).

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