A device for preparing high-weather-resistant fluorocarbon paint by VDF soap-free emulsion polymerization

Abstract

The utility model provides a kind of device of VDF soap-free emulsion polymerization preparation high weather-resistant fluorocarbon paint.The device includes reaction kettle, raw material storage tank (including deionized water, methyl methacrylate twelve fluorine heptyl ester, silane coupling agent KH-550, ammonium persulfate, VDF, hexafluorobutyl acrylate), constant pressure hopper, resin emulsion storage tank and paint configuration unit.Reaction kettle is equipped with stirring, condenser tube, temperature sensor and jacket, and temperature accurate control is realized by PLC controller;Each raw material is connected with reaction kettle by metering pump / meter, and VDF and hexafluorobutyl acrylate are realized controllable drop by constant pressure hopper;After polymerization, emulsion enters paint configuration unit to complete paint preparation by resin emulsion storage tank.The device is reasonable in structure, high in degree of automation, and can efficiently prepare environment-friendly and excellent weather-resistant fluorocarbon paint.

Description

Technical Field

[0001] This utility model relates to the field of fluorocarbon coating preparation technology, specifically to an apparatus for preparing high weather-resistant fluorocarbon coatings by soap-free emulsion polymerization of VDF (vinylidene fluoride). Background Technology

[0002] In the modern coatings industry, fluorocarbon coatings are widely used in numerous fields such as construction, aerospace, automotive manufacturing, and marine engineering due to their excellent weather resistance, corrosion resistance, and chemical stability. Traditional fluorocarbon coating emulsion polymerization processes extensively utilize perfluorooctanoic acid (PFOA) as an emulsifier. However, with increasing public concern about environmental and health issues, the harmful effects of PFOA are becoming increasingly apparent. PFOA has extremely high bioaccumulation properties, is difficult to degrade in the natural environment, can be transferred through the food chain and accumulate in organisms, posing a potential threat to ecosystems and human health. In light of this, the Stockholm Convention has restricted its use, which presents a severe environmental challenge to the production of traditional fluorocarbon coatings.

[0003] In terms of weather resistance, fluorocarbon coatings prepared using traditional processes also have significant shortcomings. According to the industry-standard accelerated aging test (QUV), the aging time for traditional fluorocarbon coatings is typically less than 1500 hours. In practical applications, especially under long-term exposure to harsh outdoor environments such as high UV radiation, high humidity, and high salt spray, traditional fluorocarbon coatings are prone to chalking, peeling, and fading, severely impacting their protective and decorative functions and increasing maintenance and recoating costs.

[0004] To address the shortcomings of traditional processes, some studies have attempted to prepare fluorocarbon coatings using soap-free polymerization technology. However, despite employing this technology, the weather resistance of the coating prepared by this patent is only 1200 hours, which still cannot meet the current market demand for highly weather-resistant fluorocarbon coatings. In the construction industry, exterior wall coatings need to maintain good appearance and protective performance for decades; in marine engineering, coatings must withstand long-term seawater erosion and marine atmospheric corrosion. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an apparatus for preparing high weather-resistant fluorocarbon coatings by VDF soap-free emulsion polymerization. The apparatus has a reasonable structure and is easy to operate. The fluorocarbon coatings prepared by this apparatus have excellent weather resistance and environmental performance.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An apparatus for preparing high weather-resistant fluorocarbon coatings by soap-free emulsion polymerization of VDF includes a reactor, a deionized water metering tank, a dodecafluoroheptyl methacrylate storage tank, a silane coupling agent KH-550 storage tank, an ammonium persulfate storage tank, a VDF metering tank, a hexafluorobutyl acrylate metering tank, a constant pressure funnel, a resin emulsion storage tank, and a coating preparation unit. The deionized water metering tank is connected to the reactor via a deionized water metering pump. The dodecafluoroheptyl methacrylate storage tank is connected to the reactor's feed port via a dodecafluoroheptyl methacrylate metering device. The silane coupling agent KH-550 storage tank is connected to the reactor via a silane coupling agent KH-550 metering device. The reactor's feed port is connected to the following: the ammonium persulfate storage tank is connected to the reactor's feed port via an ammonium persulfate meter; the VDF metering tank is connected to a constant pressure funnel via a VDF metering pump; the hexafluorobutyl acrylate metering tank is connected to a constant pressure funnel via a hexafluorobutyl acrylate metering pump; the constant pressure funnel is connected to the reactor via a drip feed pump; the reactor's discharge port is connected to a resin emulsion storage tank; the resin emulsion storage tank is connected to a coating preparation unit; the reactor is equipped with a reactor stirrer, a condenser, a temperature sensor, and a reactor jacket. A cooling water regulating valve is installed on the condenser's inlet pipe; the reactor jacket has a hot water regulating valve and a room temperature water regulating valve; the temperature sensor, cooling water regulating valve, hot water regulating valve, and room temperature water regulating valve are all electrically connected to a PLC controller.

[0007] The method for preparing highly weather-resistant fluorocarbon coatings using the above-mentioned apparatus includes the following steps: (1) Raw material pretreatment: a. Prepare deionized water, double-bonded polymerizable emulsifier dodecafluoroheptyl methacrylate, silane coupling agent KH-550, initiator ammonium persulfate, monomer VDF, and hexafluorobutyl acrylate; preferably, the conductivity of the deionized water is less than 1.5 μS / cm; the purity of VDF reaches more than 99.6% after impurity removal by a purification column; the purity of hexafluorobutyl acrylate reaches more than 98.6% after purification by vacuum distillation. b. Mix VDF and hexafluorobutyl acrylate in a ratio of 70:30 (wt%); (2) Polymerization reaction: a. Heating and premixing: Deionized water is added to the reactor and heated to 70°C. Then, dodecyl fluoroheptyl methacrylate, silane coupling agent KH-550 and ammonium persulfate are added in sequence and stirred to form a premixed system. The amount of dodecyl fluoroheptyl methacrylate is 2wt% of the total monomer, the amount of silane coupling agent KH-550 is 1wt% of the total monomer, and the amount of ammonium persulfate is 0.5wt% of the total monomer. Preferably, the amount of deionized water added accounts for 50% of the total volume of the reaction system. The heating rate is adjusted by the hot water regulating valve controlled by the PLC controller. The temperature error when the temperature is raised to 70°C is controlled within ±0.3°C. b. Monomer addition: The VDF and hexafluorobutyl acrylate mixed in step (1)b are added dropwise to the reactor at an initial rate of 1-1.5 mL / min. The addition rate is finely adjusted every 20-30 min according to the online viscosity monitoring results, and the addition is completed within 2-3 h. During the addition, the reaction temperature is maintained at 70℃ and the stirring speed is 300-350 rpm. Preferably, during the monomer addition, water is continuously circulated through the condenser, and the cooling water flow rate is controlled by the cooling water regulating valve to stabilize the reaction temperature at 70℃, and the temperature fluctuation range is controlled within ±0.8℃. c. Curing reaction: After the monomer addition is completed, the stirring speed is adjusted to 220-280 rpm, and the reaction continues at 70℃ for 2-3 h. Preferably, during the curing reaction, a sample is taken from the bottom of the reactor every 25-30 min to detect the emulsion particle size and control the emulsion particle size to be 100-120 nm.

[0008] (3) Post-reaction treatment: After the aging reaction is completed, the reaction system is cooled to below 30°C to obtain fluorocarbon resin emulsion; preferably, the cooling rate is controlled at 0.6-1°C / min.

[0009] (4) Coating preparation: Add pigments, fillers, defoamers, leveling agents and dispersants to the fluorocarbon resin emulsion obtained in step (3), and obtain a high weather-resistant fluorocarbon coating after dispersion and grinding; preferably, the amount of pigments and fillers added is 20% of the emulsion mass, the amount of defoamer added is 0.3% of the emulsion mass, the amount of leveling agent added is 0.5% of the emulsion mass, and the amount of dispersant added is 1% of the emulsion mass; the fineness of the coating after grinding is controlled at 20-30μm.

[0010] The selection and function of raw materials are as follows: Dodecafluoroheptyl methacrylate, a double-bond polymerizable emulsifier, is selected at a dosage of 2 wt% of the total monomers. In the initial stage of the polymerization reaction, its own double bond activity initiates the polymerization, promoting the formation of polymer chains from monomer molecules. In subsequent reactions, it integrates into the polymer system through chemical bonding, avoiding the residue problems of traditional emulsifiers and improving the stability and film-forming properties of the emulsion and coating.

[0011] The silane coupling agent KH-550 is introduced at a dosage of 1 wt% of the total monomers. During the polymerization reaction, it can form chemical bonds between the polymer and the substrate, strengthening the adhesion between the coating and the substrate and improving the durability of the coating.

[0012] Ammonium persulfate was used as an initiator at a dosage of 0.5 wt% of the total monomers. At a reaction temperature of 70°C, it rapidly and uniformly decomposed to generate free radicals, initiating the monomer polymerization reaction and ensuring a stable and orderly reaction.

[0013] The beneficial effects of this utility model are: 1. Enhanced weather resistance and stability The device integrates a precise addition system for silane coupling agent (KH-550), which can build chemical bonds between the polymer and the substrate, improving the adhesion between the coating and the substrate. At the same time, the PLC-controlled temperature regulation system and the controllable dripping of the constant pressure funnel ensure that the polymerization reaction proceeds smoothly, resulting in a uniform emulsion particle size and a dense coating structure after film formation. This effectively resists the erosion of harsh environments such as ultraviolet rays and salt spray, significantly improving the weather resistance of the coating.

[0014] 2. The automation and process controllability optimization device is equipped with a reactor stirrer, condenser, temperature sensor and jacket, and is linked to hot water / cold water / room temperature water regulating valve through PLC controller to realize real-time monitoring and precise control of reaction temperature; each raw material is fed independently through metering pump / meter, and VDF and hexafluorobutyl acrylate are added uniformly through constant pressure funnel, ensuring the accuracy of raw material ratio and the stability of reaction process, reducing human operation error, and improving production efficiency and product batch consistency.

[0015] 3. The multifunctional integrated and continuous production device forms an integrated process from raw material pretreatment (deionized water, monomer purification), polymerization reaction (premixing, dripping, maturation) to emulsion storage and coating preparation (pigment, filler and additive addition), reducing intermediate material transfer links and lowering the risk of pollution; the resin emulsion storage tank is directly connected to the coating preparation unit, which can realize continuous production from emulsion preparation to finished coating, and adapt to the needs of industrial scale.

[0016] 4. Material utilization and product quality assurance device: The device controls the amount of each raw material through a precise metering system to avoid waste; the reaction vessel is made of stainless steel with a high degree of smoothness on the inner wall to reduce material residue and contamination; the condenser ensures the reflux of volatiles during the reaction process, maintains the material balance of the system, and further ensures the purity and performance stability of fluorocarbon resin emulsion and coating. Attached Figure Description

[0017] Figure 1This is a process flow diagram of the device of this utility model; In the diagram: 1-Deionized water metering tank; 1.1-Deionized water metering pump; 2-Dodecafluoroheptyl methacrylate storage tank; 2.1-Dodecafluoroheptyl methacrylate metering device; 3-Silane coupling agent KH-550 storage tank; 3.1-Silane coupling agent KH-550 metering device; 4-Ammonium persulfate storage tank; 4.1-Ammonium persulfate metering device; 5-Reaction vessel; 5.1-Reaction vessel stirrer; 5.2-Cooling water regulating valve; 5.3-Hot water regulating valve; 5.4-Ambient temperature water regulating valve; 5.5-Temperature sensor; 5.6-Condenser; 5.7-PLC controller; 5.8-Reaction vessel jacket; 6-VDF metering tank; 6.1-VDF metering pump; 7-Hexafluorobutyl acrylate metering tank; 7.1-Hexafluorobutyl acrylate metering pump; 8-Constant pressure funnel; 8.1-Drip feed pump; 9-Resin emulsion storage tank; 10-Coating preparation unit. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0019] Reference Figure 1 An apparatus for preparing high weather-resistant fluorocarbon coatings by soap-free VDF emulsion polymerization includes a reactor 5, a deionized water metering tank 1, a dodecafluoroheptyl methacrylate storage tank 2, a silane coupling agent KH-550 storage tank 3, an ammonium persulfate storage tank 4, a VDF metering tank 6, a hexafluorobutyl acrylate metering tank 7, a constant pressure funnel 8, a resin emulsion storage tank 9, and a coating preparation unit 10. The deionized water metering tank 1 is connected to the reactor 5 via a deionized water metering pump 1.1, used to pump precisely metered deionized water into the reactor 5.

[0020] The dodecafluoroheptyl methacrylate storage tank 2 is connected to the feed port of the reactor 5 via a dodecafluoroheptyl methacrylate metering device 2.1; the silane coupling agent KH-550 storage tank 3 is connected to the feed port of the reactor 5 via a silane coupling agent KH-550 metering device 3.1; the ammonium persulfate storage tank 4 is connected to the feed port of the reactor 5 via an ammonium persulfate metering device 4.1; the VDF metering tank 6 is connected to the constant pressure funnel 8 via a VDF metering pump 6.1; the hexafluorobutyl acrylate metering tank 7 is connected to the constant pressure funnel 8 via a hexafluorobutyl acrylate metering pump 7.1; the constant pressure funnel 8 is connected to the reactor 5 via a drip feed pump 8.1; the discharge port of the reactor 5 is connected to the resin emulsion storage tank 9; the resin emulsion storage tank 9 is connected to the coating preparation unit 10; the reactor 5 is equipped with a reactor stirrer 5.1, a condenser 5.6, a temperature sensor 5.5, and a reactor jacket 5.8. The condenser tube 5.6 is equipped with a cooling water regulating valve 5.2 on its inlet pipe, and the reactor jacket 5.8 is equipped with a hot water regulating valve 5.3 and a normal temperature water regulating valve 5.4. The temperature sensor 5.5, the cooling water regulating valve 5.2, the hot water regulating valve 5.3 and the normal temperature water regulating valve 5.4 are all electrically connected to the PLC controller 5.7.

[0021] 1. Equipment preparation and inspection: Select a stainless steel reactor (5) with a volume suitable for the production scale, ensuring the interior is free of impurities and oil residue. Before use, rinse three times with deionized water and then dry with nitrogen to ensure the interior is clean and dry, with the surface roughness Ra controlled below 0.8μm. Install all components precisely as shown in the attached diagram, ensuring tight connections and no leaks.

[0022] A sealing test was conducted on the constant pressure funnel 8. Nitrogen gas at a pressure of 0.1 MPa was introduced into the funnel and the pressure was maintained for 30 minutes. The pressure drop should not exceed 0.01 MPa. At the same time, the constant pressure device was adjusted to stabilize the pressure at 0.08-0.1 MPa during the subsequent monomer drop process. Based on the total amount of monomer and the drop time requirements, a constant pressure funnel with a capacity of 1.3 times the expected total amount of monomer was selected.

[0023] The condenser tube 5.6 is connected to the circulating cooling water system. A water flow test is conducted, requiring the water flow rate to be stable at 5L / min and the inlet water temperature to be controlled at 20℃. The appearance of the condenser tube is checked for any leaks to ensure that it can efficiently remove the heat of reaction, allowing the steam to condense and reflux, and maintaining the stability of the material quantity in the reaction system.

[0024] Install the agitator 5.1 in the reactor, adjust the gap between it and the bottom and wall of the reactor to be controlled at 15mm, start the agitator, initially set the speed to 180rpm, run for 10 minutes, observe whether the agitator shaft shakes, and whether the blades operate normally, to ensure that it can provide a uniform and stable stirring effect for the reaction.

[0025] 2. Raw Material Pretreatment: Deionized water is accurately measured by deionized water metering pump 1.1 in deionized water metering tank 1 and then sent to reactor 5. Deionized Water Preparation: High-purity deionized water is produced using a three-stage reverse osmosis combined with ion exchange resin process. The conductivity is measured using a conductivity meter to ensure it is below 1.5 μS / cm. Subsequently, according to the reactor volume and formula ratio, 50% of the total volume of deionized water in the reaction system is accurately measured and pumped into reactor 5 through pipeline at a flow rate of 0.8 L / min.

[0026] Dodecafluoroheptyl methacrylate is metered from storage tank 2 via metering device 2.1 and then set aside. The double-bond polymerizable emulsifier, dodecafluoroheptyl methacrylate, requires precise weighing. Using an electronic balance with an accuracy of 0.0001 g, weigh 2 wt% of the total monomer amount and place it in a dry, light-protected glass bottle with a sealed cap. Before use, observe its appearance; it should be clear and transparent, without turbidity or sediment.

[0027] The silane coupling agent KH-550 is metered from storage tank 3 via metering device 3.1 and then set aside for use. Similarly, the silane coupling agent KH-550 is weighed using a high-precision balance at 1 wt% of the total monomer amount. After confirming the packaging is intact and there are no signs of moisture or clumping upon opening, it is immediately sealed and stored for later use.

[0028] Ammonium persulfate is metered from storage tank 4 via metering device 4.1 and then set aside. The initiator ammonium persulfate is stored in a desiccator and ground into a fine powder using an agate mortar before use. It is accurately weighed at 0.5 wt% of the total monomer amount to ensure that it can dissolve quickly and uniformly in the early stage of the reaction and effectively initiate the polymerization reaction.

[0029] VDF is metered via metering tank 6 by metering pump 6.1, and hexafluorobutyl acrylate is metered via metering tank 7 by metering pump 7.1. The two are mixed at a ratio of 70:30 (wt%) and then transferred to constant pressure funnel 8. Monomer processing: VDF gas is taken from a steel cylinder and first passed through a purification column containing 5A molecular sieves and activated alumina to remove trace amounts of moisture, oxygen, and other impurities, achieving a purity of over 99.6%. Hexafluorobutyl acrylate is purified by vacuum distillation at a temperature of 88-92℃ and a vacuum degree of 18 mmHg, achieving a purity of over 98.6%. The purified monomers are sealed and stored separately. The purified VDF and hexafluorobutyl acrylate are mixed evenly in a clean glass container at a mass ratio of 70:30 and transferred to constant pressure funnel 8 using a vacuum transfer device to avoid contact with air and the introduction of impurities.

[0030] 3. Polymerization reaction Heating and Premixing: Deionized water in reactor 5 is heated to 70°C under the action of reactor jacket 5.8. The temperature is monitored by temperature sensor 5.5, and the heating rate is adjusted by hot water regulating valve 5.3 controlled by PLC controller 5.7. After reaching 70°C, metered dodecafluoroheptyl methacrylate, silane coupling agent KH-550, and ammonium persulfate are added sequentially, and a premixed system is formed by stirring in reactor stirrer 5.1.

[0031] Turn on the heating device of the reactor and set the heating rate to 1.5℃ / min to slowly heat the deionized water in reactor 5 to 70℃. During the heating process, keep the stirrer running continuously at 200 rpm and monitor the temperature changes in real time to ensure that the heating is stable and the error is controlled within ±0.3℃. When the temperature reaches 70℃, add the pre-weighed dodecafluoroheptyl methacrylate, silane coupling agent KH-550 and ammonium persulfate to reactor (5) in sequence and slowly through the feed port at the top of the reactor. Stir while adding the materials and control the feeding speed at 0.8g / min to ensure that the materials are fully dispersed and dissolved in the deionized water to form a uniform premixed system. After adding the materials, continue stirring for 10 minutes to stabilize the system temperature at 70℃. During this period, the heating power is automatically adjusted by the temperature control system to maintain the temperature stability.

[0032] Monomer addition: Open valve 8 of the constant pressure funnel and adjust the pressure of the constant pressure dropping funnel to stabilize the initial dropping rate at 1.3 mL / min. Simultaneously, activate the online viscosity monitor and the temperature monitoring inside reactor 5. As the reaction proceeds, fine-tune the dropping rate every 25 minutes according to viscosity changes, with an increase not exceeding 0.3 mL / min, ensuring that the monomer mixture is added completely within 2.5 hours. During monomer addition, the stirrer operates continuously at high speed, increasing the speed to 330 rpm, to ensure that the newly added monomer disperses rapidly and participates in the polymerization reaction. Simultaneously, closely observe the temperature, pressure (if equipped with a pressure monitoring device, pressure fluctuations should be controlled within ±0.04 MPa), and material state changes inside reactor 5. Continuously circulate water through condenser 5.6 to remove heat, stabilizing the reaction temperature at 70℃, with temperature fluctuations controlled within ±0.8℃.

[0033] Curing reaction: After the monomers are added, the stirrer speed is adjusted to 250 rpm, and the reaction continues at 70℃ for 2.5 hours to allow unreacted monomers to fully polymerize, improving the conversion rate and molecular weight distribution uniformity of the polymer. During this period, samples are taken from the bottom of reactor 5 every 30 minutes using a sampling tube to observe whether the emulsion appearance is uniform and whether there are any particles or agglomerations. The emulsion viscosity is measured using a rotational viscometer, and the data is recorded. If abnormal changes in emulsion viscosity are found (deviation from the normal growth trend exceeding 10%) or particles are found, the cause is analyzed in time. For example, it may be due to temperature runaway or uneven stirring. Correction measures are taken by adjusting the heating power and checking the stirring device.

[0034] 4. Post-reaction treatment Cooling and Discharge: After the ripening reaction is complete, stop heating, turn off the stirrer, and allow the reaction system to cool naturally. To avoid rapid cooling leading to emulsion instability, circulate room temperature water through the reactor jacket 5.8, controlling the cooling rate at 0.8℃ / min, to slowly lower the reaction system to below 30℃. Once the required temperature is reached, open the discharge valve at the bottom of the reactor and transfer the prepared VDF soap-free emulsion polymerized fluorocarbon resin emulsion through a pipeline to a pre-purged and dried stainless steel storage tank 9. The storage tank must be equipped with a sealed lid to prevent the emulsion from contacting air for oxidation or contamination.

[0035] Coating Formulation: Add pigments and fillers to the obtained emulsion. For white coatings, add 20% titanium dioxide by weight of the emulsion. Pre-disperse using a high-speed disperser for 10 minutes, then further pulverize using an air jet mill to ensure uniform and fine particle size. For colored coatings, add 3% phthalocyanine blue pigment according to the color chart requirements. For light blue coatings, add an appropriate amount of white pigment to adjust brightness. Simultaneously, add 0.3% defoamer by weight of the emulsion to eliminate air bubbles during coating preparation; add 0.5% leveling agent to improve leveling performance during application; and add 1% dispersant to ensure uniform dispersion of pigments and fillers in the emulsion. Disperse the mixture with added pigments, fillers, and additives in a high-speed disperser at 1500 rpm for 45 minutes to ensure thorough wetting and dispersion of the pigments and fillers. The dispersed material is then transferred to a sand mill, where zirconia beads with a diameter of 0.8-1.2 mm are used as the grinding media. The mill is then ground at 1200 rpm for 3 hours to grind the coating to a fineness of 25 μm. Finally, a high weather-resistant fluorocarbon coating product is obtained and transferred to a sealed plastic bucket for storage, in preparation for subsequent testing, production, and sales.

[0036] Throughout the entire process, the above steps must be strictly followed. The process parameters, raw material usage, and equipment operating status of each step must be precisely controlled to ensure that the prepared high weather-resistant fluorocarbon coating has stable and reliable performance and meets the market demand for high-quality fluorocarbon coatings.

Claims

1. An apparatus for preparing high weather-resistant fluorocarbon coatings by soap-free VDF emulsion polymerization, comprising a deionized water metering tank (1), a dodecafluoroheptyl methacrylate storage tank (2), a silane coupling agent KH-550 storage tank (3), a reactor (5), an ammonium persulfate storage tank (4), a VDF metering tank (6), a hexafluorobutyl acrylate metering tank (7), a constant pressure funnel (8), a resin emulsion storage tank (9), and a coating preparation unit (10); the deionized water metering tank (1) is connected to the reactor (5) via a deionized water metering pump (1.1); the dodecafluoroheptyl methacrylate storage tank (2) is connected to the feed port of the reactor (5) via a dodecafluoroheptyl methacrylate metering device (2.1); the silane coupling agent KH-550 storage tank (3) is connected to the feed port of the reactor (5) via a silane coupling agent KH-550 metering device (3.1); The ammonium persulfate storage tank (4) is connected to the feed port of the reactor (5) via an ammonium persulfate meter (4.1); the VDF metering tank (6) is connected to the constant pressure funnel (8) via a VDF metering pump (6.1); the hexafluorobutyl acrylate metering tank (7) is connected to the constant pressure funnel (8) via a hexafluorobutyl acrylate metering pump (7.1); the constant pressure funnel (8) is connected to the reactor (5) via a drip feed pump (8.1); the discharge port of the reactor (5) is connected to the resin emulsion storage tank (9); the resin emulsion storage tank (9) is connected to the coating preparation unit (10); the reactor (5) is equipped with a reactor stirrer (5.1), a condenser (5.6), a temperature sensor (5.5), and a reactor jacket (5.8).

2. The apparatus according to claim 1, characterized in that: The condenser tube (5.6) is equipped with a cooling water regulating valve (5.2) on its water inlet pipe, and the reactor jacket (5.8) is equipped with a hot water regulating valve (5.3) and a normal temperature water regulating valve (5.4); the temperature sensor (5.5), the cooling water regulating valve (5.2), the hot water regulating valve (5.3) and the normal temperature water regulating valve (5.4) are all electrically connected to the PLC controller (5.7).

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