Preparation method of multipurpose water-based acrylic coating material

Abstract

The invention discloses a preparation method of a multipurpose water-based acrylic coating material, and relates to the technical field of coatings. The invention relates to a preparation method of a multipurpose water-based acrylic coating material, which comprises the following steps: respectively weighing raw materials of the water-based acrylic coating material according to the composition ratio of the raw materials of the water-based acrylic coating material; the water-based acrylic coating material is prepared from the following raw materials: water-based acrylic resin, first deionized water, titanium dioxide, a thickening agent, a dispersing agent, a slow-release antibacterial agent, a flatting agent, a cross-linking agent, an accelerant and a coalescing agent. The slow-release antibacterial agent is added in the water-based acrylic coating material, is zinc oxide wrapped with two layers of slow-release micro-capsule structures, has good antibacterial performance and long-time release effect, can prolong the effective antibacterial time of zinc oxide, can control the release amount of zinc ions, and can be used for preparing the water-based acrylic coating material. And unnecessary side effects on a human body caused by short-time release of high-concentration zinc ions are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and particularly to a preparation method of a multi-purpose waterborne acrylic coating material. Background Art

[0002] Waterborne acrylic coating material is an acrylic coating with water as the solvent. The main component of this coating material is acrylic resin, which has good weather resistance, adhesion, hardness, and ultraviolet resistance. One of the advantages of waterborne acrylic coatings is environmental protection. Its main solvent is water instead of organic solvents, so it has a light odor, low volatile organic compound emissions, and will not cause great pollution to the environment.

[0003] When applying waterborne acrylic coating material to the interior of a building, in order to enhance the antibacterial performance of the coating, extend the service life of the coating, and improve the indoor air quality, etc., waterborne acrylic coating materials added with antibacterial agent components are generally selected.

[0004] Currently, zinc oxide is a commonly used antibacterial agent in waterborne acrylic coating materials; the antibacterial mechanism of zinc oxide mainly lies in that zinc oxide will release zinc ions in an environment with a certain humidity, and these zinc ions are toxic to bacteria and microorganisms, can interfere with the biochemical processes of bacteria, and inhibit the reproduction of bacteria; under ultraviolet light irradiation, zinc oxide can also release free radicals for sterilization, etc.

[0005] When zinc oxide is used as an antibacterial agent in coatings, the inventor believes that there are the following technical problems: when zinc oxide is used as an antibacterial agent in the long-term use process, there will be a problem of failure due to the continuous release of zinc ions for a long time; if the addition amount of zinc oxide is increased to extend the effective time of zinc oxide, the release of high-concentration zinc ions in a short time may cause unnecessary side effects on the human body.

[0006] Therefore, how to solve the above technical problems is the technical problem faced by those of ordinary skill in the art at present.

[0007] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of implication that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0008] In view of the above technical problems, an embodiment of the present invention provides a preparation method of a multi-purpose waterborne acrylic coating material to solve the problems raised in the above background art.

[0009] A preparation method of a multi-purpose waterborne acrylic coating material includes the following steps:

[0010] According to the composition ratio of each raw material of the water-based acrylic coating material, weigh each raw material of the water-based acrylic coating material respectively;

[0011] The raw materials of the water-based acrylic coating material include: water-based acrylic resin, first deionized water, titanium dioxide, thickener, dispersant, slow-release antibacterial agent, leveling agent, cross-linking agent, accelerator and film-forming aid;

[0012] Adding first deionized water into a first container, then slowly adding water-based acrylic resin, and stirring evenly to obtain an acrylic resin emulsion;

[0013] Continue to add titanium dioxide, dispersant and thickener into the first container and stir evenly;

[0014] Continue to add the slow-release antibacterial agent, leveling agent, cross-linking agent, accelerator and film-forming aid into the first container, and stir evenly to obtain a water-based acrylic coating material;

[0015] The method for preparing the sustained-release antibacterial agent comprises the following steps:

[0016] Adding zinc oxide into the second container, and then spraying the second deionized water into the second container to make the surface of the zinc oxide in a wet and adherent state;

[0017] Adding a powdered cationic polymer into a second container; mixing and stirring to encapsulate the cationic polymer on the surface of zinc oxide, and drying after encapsulation to obtain a crude sustained-release antibacterial agent having a cationic polymer sustained-release layer structure;

[0018] preheating the crude sustained-release antibacterial agent and stirring the crude sustained-release antibacterial agent;

[0019] During the stirring process of the crude sustained-release antibacterial agent, biodegradable polylactic acid is sprayed into the second container, and a layer of polylactic acid degradable film is sprayed on the surface of the crude sustained-release antibacterial agent;

[0020] After coating, the product is dried to obtain a sustained-release antibacterial agent having a two-layer sustained-release microcapsule structure.

[0021] In this embodiment, the raw materials of the water-based acrylic coating material are calculated by weight and include: 40-50 parts of water-based acrylic resin, 30-40 parts of first deionized water, 5-10 parts of titanium dioxide, 0.5-2 parts of thickener, 1-2 parts of dispersant, 1-2 parts of sustained-release antibacterial agent, 0.1-0.5 parts of leveling agent, 1-2% of cross-linking agent, 5-10 parts of accelerator and 3-5 parts of film-forming aid.

[0022] In this embodiment, the raw materials of the sustained-release antibacterial agent include, by weight, 0.2-1 parts of second deionized water, 1-2 parts of zinc oxide, 0.2-0.8 parts of cationic polymer, and 0.2-0.5 parts of degradable polylactic acid.

[0023] In this embodiment, in the step of preheating the coarse slow-release antibacterial agent and stirring the coarse slow-release antibacterial agent, the preheating temperature is 30-50 °C.

[0024] A preparation device for preparing the slow-release antibacterial agent described above includes: a frame, a second container, a container top cover, a top cover lifting unit, a rotating parabolic disk, a spraying unit, and a first motor;

[0025] The second container and the top cover lifting unit are sequentially fixed on one side of the frame from bottom to top; the container top cover is located above the second container, the second container is cylindrical and its top is an open structure;

[0026] The driving end of the top cover lifting unit is connected to the container top cover, and the top cover lifting unit is used to drive the container top cover to lift and lower to complete the opening and closing operation of the open position at the top of the second container;

[0027] The container top cover includes a cylindrical tube and a conical cover; the conical cover is coaxially fixed in the cylindrical tube, and the conical cover is provided with a plurality of air guide holes on its cover wall; the outer diameter of the cylindrical tube is equal to the inner diameter of the second container;

[0028] The rotating parabolic disk is arranged in the second container, and there is a gap A between the bottom surface of the rotating parabolic disk and the bottom wall of the second container; the diameter of the rotating parabolic disk is equal to the inner diameter of the second container;

[0029] A plurality of radial grooves with the same size and shape are arranged in a circumferential array on the rotating parabolic disk, and the two side walls of the radial grooves are inclined; a plurality of vertical air pushing holes are arranged at intervals on the bottom wall of the radial grooves;

[0030] The first motor is fixed on the outer side of the bottom of the second container, and the main shaft of the first motor vertically penetrates the bottom wall of the second container and is fixed to the rotating parabolic disk;

[0031] An air pipe joint is arranged on the peripheral wall of the second container, and the installation position of the air pipe joint is between the bottom surface of the rotating parabolic disk and the bottom wall of the second container;

[0032] The spraying unit includes an annular pipe, a water pipe joint, and a plurality of spray heads; the annular pipe is arranged in the second container, a plurality of spray heads are arranged at intervals on the annular pipe, and the water pipe joint is fixed on the peripheral wall of the second container and connected to the annular pipe.

[0033] In this embodiment, the top cover lifting unit includes a second motor, a guide post, a lead screw, and a lifting seat;

[0034] The guide post is vertically fixed on one side of the frame; the lead screw is vertically arranged and the two ends of the lead screw are rotatably connected to one side of the frame; the lifting seat is slidably connected to the guide post and threadedly connected to the lead screw;

[0035] The second motor is fixed to the top of the frame, and the main shaft of the second motor is fixedly connected to the upper end of the lead screw; the container top cover is connected to the bottom of the lifting seat.

[0036] In this embodiment, a third motor is provided on the top of the lifting seat, and the main shaft of the third motor vertically penetrates the lifting seat and is fixedly connected to the container top cover.

[0037] The preparation method of a multi-purpose waterborne acrylic coating material provided by an embodiment of the present invention has the following beneficial effects: in the waterborne acrylic coating material of the present invention, a sustained-release antibacterial agent is added. The sustained-release antibacterial agent is zinc oxide wrapped with a two-layer sustained-release microcapsule structure, which has good antibacterial performance and a long-term release effect. It can not only extend the effective antibacterial time of zinc oxide, but also control the release amount of zinc ions, avoiding unnecessary side effects on the human body caused by the release of high-concentration zinc ions in a short time; at the same time, the present invention has developed a preparation device for the sustained-release antibacterial agent, and this preparation device can make the powder material and the granular material reach a fully uniform mixing state, and prepare a sustained-release antibacterial agent with a uniform sustained-release layer structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic structural diagram of the preparation device for the sustained-release antibacterial agent in the present invention;

[0039] Figure 2 For the present invention Figure 1 Schematic cross-sectional structure diagram;

[0040] Figure 3 It is a schematic structural diagram of the first angle of the container top cover in the present invention;

[0041] Figure 4 It is a schematic structural diagram of the second angle of the container top cover in the present invention;

[0042] Figure 5 It is a schematic structural diagram of the rotating parabolic disk in the present invention;

[0043] Figure 6 For the present invention Figure 5 Schematic cross-sectional structure diagram. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

[0045] In view of the above technical problems, an embodiment of the present invention provides a preparation method of a multi-purpose waterborne acrylic coating material to solve the problems raised in the above background technology.

[0046] Embodiment 1

[0047] 1. A method for preparing a multi-purpose water-based acrylic coating material, comprising the following steps:

[0048] According to the composition ratio of each raw material of the water-based acrylic coating material, weigh each raw material of the water-based acrylic coating material respectively;

[0049] The raw materials of the water-based acrylic coating material include: water-based acrylic resin, first deionized water, titanium dioxide, thickener, dispersant, slow-release antibacterial agent, leveling agent, cross-linking agent, accelerator and film-forming aid;

[0050] Adding first deionized water into a first container, then slowly adding water-based acrylic resin, and stirring evenly to obtain an acrylic resin emulsion;

[0051] Continue to add titanium dioxide, dispersant and thickener into the first container and stir evenly;

[0052] Continue to add the slow-release antibacterial agent, leveling agent, cross-linking agent, accelerator and film-forming aid into the first container, and stir evenly to obtain a water-based acrylic coating material;

[0053] The method for preparing the sustained-release antibacterial agent comprises the following steps:

[0054] Adding zinc oxide into the second container, and then spraying the second deionized water into the second container to make the surface of the zinc oxide in a wet and adherent state;

[0055] Adding a powdered cationic polymer into a second container; mixing and stirring to encapsulate the cationic polymer on the surface of zinc oxide, and drying after encapsulation to obtain a crude sustained-release antibacterial agent having a cationic polymer sustained-release layer structure;

[0056] preheating the crude sustained-release antibacterial agent and stirring the crude sustained-release antibacterial agent;

[0057] During the stirring process of the crude sustained-release antibacterial agent, biodegradable polylactic acid is sprayed into the second container, and a layer of polylactic acid degradable film is sprayed on the surface of the crude sustained-release antibacterial agent;

[0058] After coating, the product is dried to obtain a sustained-release antibacterial agent having a two-layer sustained-release microcapsule structure.

[0059] In this embodiment, the raw materials of the water-based acrylic coating material are calculated by weight and include: 40-50 parts of water-based acrylic resin, 30-40 parts of first deionized water, 5-10 parts of titanium dioxide, 0.5-2 parts of thickener, 1-2 parts of dispersant, 1-2 parts of sustained-release antibacterial agent, 0.1-0.5 parts of leveling agent, 1-2% of cross-linking agent, 5-10 parts of accelerator and 3-5 parts of film-forming aid.

[0060] In this embodiment, the cationic polymer is selected from: polyquaternium-7, polyquaternium-6, polyquaternium-39, etc.

[0061] In this embodiment, each raw material of the sustained-release antibacterial agent, by mass, includes: 0.2 - 1 part of secondary deionized water, 1 - 2 parts of zinc oxide, 0.2 - 0.8 part of cationic polymer, and 0.2 - 0.5 part of degradable polylactic acid.

[0062] In this embodiment, in the step of preheating the crude sustained-release antibacterial agent and stirring the crude sustained-release antibacterial agent, the preheating temperature is 30 - 50 °C.

[0063] II. The design principles of each step in the preparation method of the sustained-release antibacterial agent are as follows:

[0064] (1) The purpose of adding zinc oxide to the second container and spraying deionized water is to increase the surface wettability and surface activity of zinc oxide, promote the formation of an adhesion state on the surface of zinc oxide, and facilitate subsequent adhesion and combination with the powdery cationic polymer.

[0065] (2) Adding the powdery cationic polymer to the second container and mixing and stirring it is to promote the powdery cationic polymer to encapsulate on the surface of zinc oxide to form a layer of cationic polymer sustained-release layer.

[0066] The cationic polymer is a coating shell of a sustained-release reagent, which can control the release rate of zinc ions in zinc oxide and prolong the antibacterial effect; and the cationic polymer itself usually has antibacterial properties, which can further enhance the effect of the antibacterial agent.

[0067] (3) After the encapsulation of the cationic polymer is completed, drying is carried out. The purpose is to remove moisture, make the encapsulation layer more stable, and ensure that the crude sustained-release antibacterial agent has an appropriate structural form.

[0068] (4) The purpose of preheating the crude sustained-release antibacterial agent is to stably adsorb polylactic acid. Polylactic acid is a biodegradable polymer with good biocompatibility and degradability; it can form a thin film on the surface of the antibacterial agent; the function of this thin film is to further enhance the sustained-release characteristics, control the release rate of the antibacterial agent, and make the use of the antibacterial agent more environmentally friendly because the polylactic acid film is degradable.

[0069] (5) After the lactic acid coating is completed, drying is carried out to remove the excess moisture, ensure the stable formation of the polylactic acid film on the surface of the antibacterial agent, and be able to firmly wrap the inner layer of zinc oxide and cationic polymer; the dried product is the final sustained-release antibacterial agent, which has a two-layer sustained-release microcapsule structure:

[0070] The inner slow-release microcapsule structure is zinc oxide encapsulated by a cationic polymer, which can provide slow-release and antibacterial effects; the outer slow-release microcapsule structure is a slow-release layer composed of a polylactic acid film, which further controls the release rate of the antibacterial agent and prolongs the persistence of its antibacterial effect.

[0071] The slow-release antibacterial agent prepared through these steps has good antibacterial performance and long-term release effect. It can not only extend the effective antibacterial time of zinc oxide, but also control the release amount of zinc ions, avoiding unnecessary side effects on the human body caused by the release of high-concentration zinc ions in a short time.

[0072] III. Experimental Effect Test

[0073] 1. Experimental Grouping:

[0074] Experimental Group: 45 parts of waterborne acrylic resin, 35 parts of first deionized water, 8 parts of titanium dioxide, 1 part of thickener, 1 part of dispersant, 1 part of slow-release antibacterial agent (slow-release zinc oxide), 0.5 part of leveling agent, 1 part of crosslinking agent, 8 parts of accelerator and 4 parts of film-forming auxiliary;

[0075] Control Group: 45 parts of waterborne acrylic resin, 35 parts of first deionized water, 8 parts of titanium dioxide, 1 part of thickener, 1 part of dispersant, 1 part of antibacterial agent (zinc oxide), 0.5 part of leveling agent, 1 part of crosslinking agent, 8 parts of accelerator and 4 parts of film-forming auxiliary.

[0076] 2. Experimental Test Process:

[0077] After the two groups of coatings are prepared according to the preparation method of a multi-purpose waterborne acrylic coating material of the present invention, the two groups of coatings are respectively coated on a standard test surface (here the standard test surface is a glass plate), and the thickness of the coatings is ensured to be the same; then the two standard test surfaces coated with coatings are respectively placed in two rooms for observation and air sampling. The two rooms simulate a normal home environment, with ventilation for a certain period of time during the day and a closed state at night; and the zinc ion concentration in the air is measured by atomic absorption spectrometry.

[0078] 3. Experimental Results: In the two rooms, the zinc ion concentration in the air of the room coated with the control group coating is larger, and over time, the zinc ion concentration in the air of the room coated with the control group coating gradually decreases and is less than that of the room coated with the experimental group coating.

[0079] Example 2; Refer to Figures 1 - 6 。

[0080] In Example 1, a preparation method of a sustained-release antibacterial agent was developed. However, the inventor found that when coating powdery cationic polymer on zinc oxide, it was difficult for existing equipment to achieve uniform coating of the powdery cationic polymer on the surface of zinc oxide particles. Traditional stirring equipment could not effectively ensure the uniformity and stability during the coating process, which led to poor sustained-release performance of the zinc oxide antibacterial agent and affected its long-term effectiveness and safety in the coating. Therefore, the inventor designed a preparation device for the sustained-release antibacterial agent.

[0081] A preparation device for the sustained-release antibacterial agent described in Example 1, comprising: a frame 100, a second container 400, a container top cover 200, a top cover lifting unit, a rotating parabolic disk 600, a spraying unit, and a first motor 520;

[0082] The frame 100 includes vertical rods 110, a top plate 120 fixed to the top of the vertical rods 110, and a base 130 fixed to the bottom of the vertical rods 110;

[0083] The second container 400 and the top cover lifting unit are sequentially fixed to one side of the frame 100 from bottom to top; the container top cover 200 is located above the second container 400. The second container 400 is cylindrical and the top of the second container 400 is an open structure;

[0084] The driving end of the top cover lifting unit is connected to the container top cover 200. The top cover lifting unit is used to drive the container top cover 200 to lift and lower to complete the opening and closing operations of the open position at the top of the second container 400;

[0085] The container top cover 200 includes a cylindrical tube 210 and a conical cover 220; the conical cover 220 is coaxially fixed in the cylindrical tube 210. The conical cover 220 is provided with a plurality of air guide holes 221 on its cover wall; the outer diameter of the cylindrical tube 210 is equal to the inner diameter of the second container 400;

[0086] The rotating parabolic disk 600 is arranged in the second container 400. There is a gap A between the bottom surface of the rotating parabolic disk 600 and the bottom wall of the second container 400; the diameter of the rotating parabolic disk 600 is equal to the inner diameter of the second container 400;

[0087] A plurality of radial grooves 620 with the same size and shape are arranged in a circumferential array on the rotating parabolic disk 600. The groove walls 611 of the radial grooves 620 are inclined; a plurality of vertical air pushing holes 620 are arranged at intervals on the bottom wall of the radial grooves 620;

[0088] Among them, the purpose of the inclined arrangement of the groove walls 611 is to increase the contact angle between the material and the groove walls. In this way, the action of centrifugal force and rotational movement can be utilized to better guide the material to be thrown outwards or upwards;

[0089] The first motor 520 is fixed on the outer side of the bottom of the second container 400. The main shaft of the first motor 520 vertically penetrates the bottom wall of the second container 400 and is fixedly connected to the rotating parabolic dish 600.

[0090] An air pipe joint 710 is arranged on the peripheral wall of the second container 400. The installation position of the air pipe joint 710 is between the bottom surface of the rotating parabolic dish 600 and the bottom wall of the second container 400.

[0091] The spraying unit includes an annular pipe 800, a water pipe joint 720 and a plurality of spray heads. The annular pipe 800 is arranged in the second container 400. The plurality of spray heads are arranged at intervals on the annular pipe 800. The water pipe joint 720 is fixed on the peripheral wall of the second container 400 and is connected to the annular pipe 800.

[0092] It should be noted that the water pipe joint 720 is a tee. One of the pipe joints is connected to the water tank, and the other pipe joint is connected to the container loaded with the polylactic acid solution. Pumps are arranged on the pipelines connected to the water tank and the container loaded with the polylactic acid solution.

[0093] The polylactic acid solution is formed by dissolving polylactic acid particles in solvents such as acetone and chloroform. During the long-term use of the equipment, the solvent may cause precipitation or condensation of polylactic acid after volatilization, which may block the spray heads. Therefore, it is necessary to regularly maintain the equipment pipelines.

[0094] In this embodiment, the top cover lifting unit includes a second motor 340, a guide post 320, a lead screw 330 and a lifting seat 310.

[0095] The guide post 320 is vertically fixed on one side of the frame 100. The lead screw 330 is vertically arranged and the two ends of the lead screw 330 are rotatably connected to one side of the frame 100. The lifting seat 310 is slidably connected to the guide post 320 and is threadedly connected to the lead screw 330.

[0096] The second motor 340 is fixed on the top of the frame 100, and the main shaft of the second motor 340 is fixedly connected to the upper end of the lead screw 330. The container top cover 200 is connected to the bottom of the lifting seat 310. Controlling the second motor 340 to work to lift the container top cover 200 is used to open or close the top of the second container 400.

[0097] In this embodiment, a third motor 510 is arranged on the top of the lifting seat 310. The main shaft of the third motor 510 vertically penetrates the lifting seat 310 and is fixedly connected to the container top cover 200.

[0098] When the top cover lifting unit drives the container top cover 200 to descend, the outer diameter of the cylindrical tube 210 of the container top cover 200 is equal to the inner diameter of the second container 400. There may be a situation where it is difficult for the container top cover 200 to enter the second container 400, or the inner wall of the second container 400 is relatively rough, interfering with the descending operation of the container top cover 200. During the descent of the container top cover 200, control the third motor 510 to work and drive the container top cover 200 to rotate, facilitating the smooth entry of the container top cover 200 into the second container 400.

[0099] In this embodiment, a heating wire is provided on the container barrel wall of the second container 400 to facilitate heating of the raw materials in the second container 400; a discharge port 410 is provided at a position near the bottom of the container barrel wall of the second container 400.

[0100] II. The method for preparing the sustained-release antibacterial agent using the preparation device for the sustained-release antibacterial agent in this embodiment is as follows:

[0101] 1. Weigh each raw material of the sustained-release antibacterial agent according to the composition ratio of each raw material of the sustained-release antibacterial agent.

[0102] 2. The top cover lifting unit works to drive the container top cover 200 to lift and open the top open position of the second container 400, and add zinc oxide to the second container 400.

[0103] 3. Inject deionized water into the annular tube 800, and spray the water onto the surface of the zinc oxide through the spray head; start the first motor 520, and slowly rotate the rotating parabolic dish 600 to stir the zinc oxide particles, making the surface of the zinc oxide particles moist and forming an adhesive state.

[0104] 4. Add the powdered cationic polymer into the second container; the top cover lifting unit continues to work, driving the container top cover 200 to descend until it penetrates into the second container 400, completing the closing operation of the top open position of the second container 400.

[0105] Control the first motor 520 to rotate at a constant speed to drive the rotating parabolic dish 600 in the second container 400 to rotate; at the same time, send air into the second container 400 through the air pipe joint 710 for the encapsulation operation of the cationic polymer on the surface of the zinc oxide.

[0106] Under the combined action of the rotating parabolic dish 600 and the wind force, the movement direction of the mixed material of the powdered cationic polymer and zinc oxide in the second container 400 is specifically as follows:

[0107] A. The zinc oxide particles in the mixed material have a relatively large gravity. Under the driving of the rotation of the rotating parabolic dish 600, the zinc oxide particles will be thrown upward under the action of centrifugal force and rotational motion.

[0108] B. After the upward-tumbling zinc oxide particles collide upward with the conical cover 220 in the container top cover 200, since the side wall of the conical cover 220 is conically inclined, after the zinc oxide particles collide with the side wall of the conical cover 220, the movement direction changes, and they will tumble downward towards the middle position of the second container 400 and finally fall back to the bottom of the second container 400 to complete a cyclic action; subsequently, the zinc oxide particles enter the next cyclic action again;

[0109] C. At the same time, because the cationic polymer in the mixed material has a small gravity, it is very difficult to tumble upward under the rotation of the rotating parabolic disk 600; at this time, by means of the air pipe joint 710, air is sent into the second container 400, and the wind force is sent to the gap A between the bottom surface of the rotating parabolic disk 600 and the bottom wall of the second container 400, and then ejected from the vertical air injection holes 620 of the rotating parabolic disk 600, and drives the cationic polymer to tumble upward to make the powdery cationic polymer in the second container 400 in a suspended state; at the same time, the wind force in the second container 400 overflows to the outside through several air guide holes 221 on the conical cover 220 in the container top cover 200;

[0110] D. Because the whole movement process of the zinc oxide particles in the second container 400 is a continuously tumbling and mixing flow state, the zinc oxide particles can better adhere and combine with the suspended powdery cationic polymer during the movement process, so that the powder material and the granular material reach a fully uniform mixing state, and a cationic polymer slow-release layer is coated on the surface of the zinc oxide particles;

[0111] 4. Then the equipment stops, and the zinc oxide particles coated with a cationic polymer slow-release layer are naturally dried at room temperature to obtain a crude slow-release antibacterial agent with a cationic polymer slow-release layer structure;

[0112] 5. Turn on the heating wire on the barrel wall of the second container 400 to preheat the crude slow-release antibacterial agent; at the same time, introduce the polylactic acid solution into the annular tube 800 and spray it onto the crude slow-release antibacterial agent from the spray head; control the first motor 520 to rotate slowly to drive the rotating parabolic disk 600 in the second container 400 to rotate and stir the crude slow-release antibacterial agent, so that a polylactic acid degradable film is sprayed on the surface of the crude slow-release antibacterial agent;

[0113] 6. Then the equipment stops, and the zinc oxide particles coated with two-layer slow-release microcapsule structures are naturally dried at room temperature to obtain a slow-release antibacterial agent with two-layer slow-release microcapsule structures.

[0114] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for preparing a multi-purpose water-based acrylic coating material, characterized in that: The following steps are involved: According to the composition ratio of each raw material of the water-based acrylic coating material, weigh each raw material of the water-based acrylic coating material respectively; The raw materials of the water-based acrylic coating material include: water-based acrylic resin, first deionized water, titanium dioxide, thickener, dispersant, slow-release antibacterial agent, leveling agent, cross-linking agent, accelerator and film-forming aid; Adding first deionized water into a first container, then slowly adding water-based acrylic resin, and stirring evenly to obtain an acrylic resin emulsion; Continue to add titanium dioxide, dispersant and thickener into the first container and stir evenly; Continue to add the slow-release antibacterial agent, leveling agent, cross-linking agent, accelerator and film-forming aid into the first container, and stir evenly to obtain a water-based acrylic coating material; The method for preparing the sustained-release antibacterial agent comprises the following steps: Adding zinc oxide into the second container, and then spraying the second deionized water into the second container to make the surface of the zinc oxide in a wet and adherent state; Adding a powdered cationic polymer into a second container; mixing and stirring to encapsulate the cationic polymer on the surface of zinc oxide, and drying after encapsulation to obtain a crude sustained-release antibacterial agent having a cationic polymer sustained-release layer structure; preheating the crude sustained-release antibacterial agent and stirring the crude sustained-release antibacterial agent; During the stirring process of the crude sustained-release antibacterial agent, biodegradable polylactic acid is sprayed into the second container, and a layer of polylactic acid degradable film is sprayed on the surface of the crude sustained-release antibacterial agent; After coating, the product is dried to obtain a sustained-release antibacterial agent having a two-layer sustained-release microcapsule structure.

2. The method for preparing the multi-purpose water-based acrylic coating material according to claim 1, characterized in that: The raw materials of the water-based acrylic coating material are calculated by weight and include: 40-50 parts of water-based acrylic resin, 30-40 parts of first deionized water, 5-10 parts of titanium dioxide, 0.5-2 parts of thickener, 1-2 parts of dispersant, 1-2 parts of sustained-release antibacterial agent, 0.1-0.5 parts of leveling agent, 1-2% of cross-linking agent, 5-10 parts of accelerator and 3-5 parts of film-forming aid.

3. The method for preparing the multi-purpose water-based acrylic coating material according to claim 1, characterized in that: The raw materials of the sustained-release antibacterial agent include, by weight, 0.2-1 parts of second deionized water, 1-2 parts of zinc oxide, 0.2-0.8 parts of cationic polymer and 0.2-0.5 parts of degradable polylactic acid.

4. The method for preparing the multi-purpose water-based acrylic coating material according to claim 1, characterized in that: In the step of preheating the crude sustained-release antibacterial agent and stirring the crude sustained-release antibacterial agent, the preheating temperature is 30-50°C.

5. A device for preparing the sustained-release antibacterial agent as claimed in claim 1, characterized in that: include: A frame, a second container, a container cover, a cover lifting unit, a rotating parabolic dish, a spray unit and a first motor; The second container and the top cover lifting unit are fixed on one side of the frame in sequence from bottom to top; the container top cover is located above the second container, and the second container is cylindrical and has an open structure at the top; The driving end of the top cover lifting unit is connected to the container top cover, and the top cover lifting unit is used to drive the container top cover to perform lifting operations to complete the opening and closing operations of the top open position of the second container; The container top cover comprises a cylindrical tube and a conical cover; the conical cover is coaxially fixed in the cylindrical tube, and a plurality of air guide holes are arranged on the cover wall of the conical cover; the outer diameter of the cylindrical tube is equal to the inner diameter of the second container; The rotating parabolic dish is arranged in the second container, and there is a gap between the bottom surface of the rotating parabolic dish and the bottom wall of the second container; the diameter of the rotating parabolic dish is equal to the inner diameter of the second container; A plurality of radial grooves of the same size and shape are arranged in a circular array on the rotating parabolic disk, and the groove walls on both sides of the radial grooves are arranged at an inclination; a plurality of vertical air-pushing holes are arranged at intervals on the bottom wall of the radial grooves; The first motor is fixed on the outer side of the bottom of the second container, and the main shaft of the first motor vertically penetrates the bottom wall of the second container and is fixedly connected to the rotating parabolic dish; An air pipe joint is arranged on the peripheral wall of the second container, and the installation position of the air pipe joint is between the bottom surface of the rotating parabolic dish and the bottom wall of the second container; The spray unit comprises an annular tube, a water pipe joint and a plurality of spray heads; the annular tube is arranged in the second container, a plurality of spray heads are arranged on the annular tube at intervals, and the water pipe joint is fixed on the peripheral wall of the second container and connected to the annular tube.

6. The device for preparing a sustained-release antibacterial agent according to claim 5, characterized in that: The top cover lifting unit includes a second motor, a guide column, a lead screw and a lifting seat; The guide column is vertically fixed on one side of the frame; the lead screw is vertically arranged and both ends of the lead screw are rotatably connected to one side of the frame; the lifting seat is slidably connected to the guide column and is threadedly connected to the lead screw; The second motor is fixed on the top of the frame, and the main shaft of the second motor is fixedly connected to the upper end of the lead screw; the container top cover is connected to the bottom of the lifting seat.

7. The device for preparing a sustained-release antibacterial agent according to claim 6, characterized in that: A third motor is arranged on the top of the lifting seat, and a main shaft of the third motor vertically penetrates the lifting seat and is fixedly connected to the container top cover.

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