Algae-inhibiting antibacterial self-cleaning anticorrosive coating and construction method thereof

Abstract

The present application relates to the field of paint technology, in particular to an algae-inhibiting, antibacterial, self-cleaning and anticorrosive paint and a construction method thereof. The anticorrosive paint comprises component A and component B, and the two components are used together during construction. The anticorrosive paint realizes the multifunctional integration of algae inhibition, antibacterial property, self-cleaning, anticorrosion, heat insulation and aging resistance through the synergistic effect of the components, and has significant performance advantages. The anticorrosive paint is not only suitable for ships and marine engineering equipment, but also can be used for coastal oil storage tanks, pipelines, high-speed railway bridges, outdoor steel structures and the like, and has a broad application prospect. In the construction method of the algae-inhibiting, antibacterial, self-cleaning and anticorrosive paint, a pre-mixing type spraying device is used to adopt a process of first partial pre-mixing and then overall mixing. The component B is pre-injected into the component A in a high-pressure dispersion mode, the viscosity of the component B is preliminarily reduced through shearing and turbulent flow, and the uniformity and stability of the mixture of the two components are improved. In addition, a dispersion spraying system composed of a stirring main shaft, a stirring rod and a discharge hole is used to uniformly disperse the pre-mixed material into the stirring tank.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to an algae-inhibiting, antibacterial, self-cleaning, and anti-corrosion coating and its application method. Background Technology

[0002] Ships, marine engineering equipment, oil storage tanks, pipelines, and other facilities in coastal areas are exposed to harsh environments characterized by high humidity, high salt spray, and strong sunlight. Algal spores from the air and seawater can easily migrate and adhere to the equipment surface via rainwater. Under suitable temperature, humidity, and light conditions, algae rapidly multiply and synergistically form biofilms with bacteria and other microorganisms. This alters the local chemical environment (pH, oxygen content) on the equipment surface, inducing electrochemical reactions that trigger microbial corrosion and severely shorten the service life of the anti-corrosion coating. Simultaneously, the biofilm eutrophicates the coating surface, providing a breeding ground for large fouling organisms such as barnacles and shellfish, leading to complex fouling, exacerbating equipment corrosion, and increasing maintenance costs.

[0003] Currently, protective measures against such problems are mostly single-function coatings, such as antifouling coatings, anti-corrosion coatings, or heat-insulating coatings. Conventional antifouling coatings often rely on the leaching of toxic materials such as organotin compounds and cuprous oxide, which poses problems of environmental pollution and limited shelf life. Ordinary anti-corrosion coatings do not have the ability to inhibit the adhesion and growth of microorganisms. Traditional heat-insulating coatings mainly focus on thermal barrier properties in high-temperature environments, but their ability to reflect solar radiation heat is insufficient, and they cannot effectively reduce the surface temperature of facilities, thus indirectly providing a favorable environment for microbial growth.

[0004] In addition, during traditional coating application, the coating is mixed simply by stirring using spraying equipment. When mixing two-component coatings, the high local concentration and viscosity of the components result in poor flowability during mixing. Simply stirring alone leads to poor uniformity of the coating components, which directly manifests as uneven thickness distribution and poor adhesion of the coating after spraying. Summary of the Invention

[0005] The purpose of this invention is to provide an algae-inhibiting, antibacterial, self-cleaning, and anti-corrosion coating and its application method to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution.

[0007] An algae-inhibiting, antibacterial, self-cleaning, and anti-corrosion coating comprises component A and component B, which are mixed during application. Component A, by weight, includes: 3-5 parts xylene, 1-2 parts butyl acetate, 3-5 parts propylene glycol methyl ether acetate, 40-55 parts fluoroethylene-vinyl ether copolymer, 2-6 parts silicone-modified polyacrylate resin, 0.5-1.5 parts dispersant, 0.8-1.2 parts organobentonite, 10-15 parts rutile titanium dioxide, 10-15 parts near-infrared reflective titanium dioxide, 5-10 parts long-lasting protective bactericide, 5-10 parts precipitated barium sulfate, 0.3-0.6 parts leveling agent, and 0.5-1.5 parts polymeric preservative. Component B, by weight, includes: 7.5-15 parts trimer isocyanate resin and 3-5 parts anhydrous butyl acetate.

[0008] The preparation method of component A includes the following steps: Raw material mixing: Add xylene, butyl acetate, propylene glycol methyl ether acetate, fluoroethylene-vinyl ether copolymer, organosilicon modified polyacrylate resin, and dispersant to the dispersion tank and disperse evenly at a speed of 300-500 r / min. Add organobentonite, rutile titanium dioxide, near-infrared reflective titanium dioxide, long-lasting protective bactericide, and precipitated barium sulfate to the dispersion tank and disperse at a high speed of 600-800 r / min for 30 min. Grinding: After testing and confirming that there are no large particles visible to the naked eye, grind the material, controlling the grinding temperature to ≤50℃ and the material fineness to <20μm; Paint mixing: Pour the properly ground material into the paint mixing kettle, stir evenly at room temperature, then add leveling agent and polymer preservative, and continue stirring for 15 minutes until evenly mixed; Packaging: After passing the performance test by sampling, the product is filtered through 150-mesh silk cloth and then packaged in drums.

[0009] The preparation method of component B includes the following steps: Raw material mixing: Add the trimer isocyanate resin and anhydrous butyl ester to the mixing tank and stir at 300 r / min for 20 min until homogeneous; Packaging: After passing the performance test by sampling, the product is packaged in drums.

[0010] Preferably, the algae-inhibiting, antibacterial, self-cleaning, and anti-corrosion coating is applied using premixed spraying equipment. During application, it is essential to ensure good ventilation in the application environment, with the ambient temperature controlled between 5-35℃, relative humidity <85%, and the substrate surface temperature at least 3℃ above the dew point. The specific application method includes the following steps: Surface treatment: Degreasing, rust removal, repair, and dust removal of the substrate; Premixing: Weigh the components A and B accurately according to a weight ratio of 10:1. First, put all of the components A into the mixing tank and stir for 3-5 minutes to break up the sediment at the bottom. Then, extract a certain amount of components A from the mixing tank into the premixing chamber and extract components B from the temporary storage tank into the cylindrical core. Use pressure to inject components B into components A in the premixing chamber through a one-way injection hole to premix and obtain the premixed material. Dilution and remixing: Pour the premixed material in the premixing chamber into the mixing tank, mix it with the remaining component A, add diluent to adjust the viscosity to 20-25s, and continue stirring for 10min until the two components are completely mixed and there is no visible layering or sedimentation. Let it stand and mature for 20min to allow the bubbles to escape naturally. Coating: Adjust the spray gun pressure to 0.3-0.5MPa, keep the distance between the nozzle and the substrate at 20-30cm, and control the spray thickness to 60-80μm dry film thickness; Drying and curing: Allow to cure naturally in the application environment for 2-4 hours, until the coating is no longer sticky to the touch. Continue curing for 24-48 hours, until scratching the coating with a fingernail leaves no mark, indicating that the coating is fully cured.

[0011] Preferably, the amount of diluent added does not exceed 5% of the total weight of the mixed coating; the diluent is prepared by mixing xylene and butyl acetate in a 1:1 ratio.

[0012] Preferably, the premixed spraying equipment includes a mixing tank, a spray gun, a premixing cylinder, and a temporary storage tank; a discharge pump is installed on one side of the bottom of the mixing tank, and the discharge pump is connected to the spray gun through a supply pipe; the premixing cylinder is installed above the mixing tank via a support frame, and the temporary storage tank is installed on the upper side of the premixing cylinder via a support frame; a cylindrical core is installed inside the premixing cylinder, and multiple sealing rings are embedded on the outer wall of the cylindrical core, the cylindrical core and the sealing rings forming a piston body that slides and matches the inner wall of the premixing cylinder, and a first piston component is installed inside the cylindrical core; a first telescopic cylinder for driving the lifting and lowering adjustment of the cylindrical core and a second telescopic cylinder for driving the first telescopic cylinder are provided above the premixing cylinder. A second telescopic cylinder for adjusting the lifting of a piston component; a guide pipe connected to the inside of the mixing tank is located on the side of the premixing cylinder below the cylindrical core, and a valve is installed on the guide pipe; a suction pipe connected to the bottom of the temporary storage tank is located on the side of the premixing cylinder above the guide pipe; an inlet hole is provided on the side of the cylindrical core near its bottom end, and when the cylindrical core moves to its limit position, the inlet hole is aligned and connected with the suction pipe; several one-way injection holes are evenly distributed on the bottom end face of the cylindrical core; a limiting boss is fixed on the inner wall of the premixing cylinder at the same height as the guide pipe; the bottom of the cylindrical core and the upper surface of the limiting boss abut and block each other.

[0013] Preferably, a second piston is installed inside the premixing cylinder below the limiting boss, and a premixing cavity is formed inside the premixing cylinder between the cylindrical core and the second piston; the top of the second piston abuts against the lower surface of the limiting boss; a vertically extending spring is provided inside the premixing cylinder below the second piston, the top of the spring is fixed to the lower surface of the second piston, and the bottom is fixed to the bottom wall inside the premixing cylinder.

[0014] Preferably, the first telescopic cylinder is fixed above the premixing cylinder by a bracket, and a first connecting rod is fixed to the top of the cylindrical core. The first connecting rod extends vertically upward through the top of the premixing cylinder. The telescopic end of the first telescopic cylinder faces downward and is fixedly connected to the top of the first connecting rod by a connecting frame. The first connecting rod is hollow, and a second telescopic cylinder is fixed to the top of the first connecting rod. The telescopic end of the second telescopic cylinder extends into the interior of the first connecting rod and is fixed with the second connecting rod. The second connecting rod extends vertically downward through the interior of the cylindrical core and is fixedly connected to the top of the first piston.

[0015] Preferably, the side of the premixing cylinder is also provided with a linkage pushing mechanism, which is used to link the second piston to move upward synchronously when the first telescopic cylinder pushes the cylindrical core downward, so as to press the premixed material into the mixing tank through the guide pipe; the bottom of the second piston is fixed with a guide rod that extends vertically downward to the outside of the premixing cylinder; a spring is arranged around the guide rod; the linkage pushing mechanism includes a drive gear, a first rack, a second rack and a push plate; the drive gear is rotatably mounted on the side of the premixing cylinder through a U-shaped seat, the first rack is vertically mounted on the side of the connecting frame; the second rack is vertically limited and slidably mounted on the side of the premixing cylinder, the bottom end of the second rack extends to the bottom of the premixing cylinder and is fixed with a push plate that abuts against the bottom end of the guide rod; the first rack and the second rack mesh with the drive gear from both sides respectively.

[0016] Preferably, a stirring shaft is vertically and rotatably installed inside the mixing tank, with the top end of the stirring shaft extending through to the top of the mixing tank, and several stirring rods are evenly distributed on the outer wall of the stirring shaft; an agitator is installed at the bottom end of the stirring shaft; and a drive device for driving the stirring shaft to rotate is provided at the top of the mixing tank.

[0017] Preferably, the stirring main shaft is hollow with an open top and a sealed bottom; the end of the guide pipe is rotatably connected to the top of the stirring main shaft through a rotary joint, and the guide pipe is fixedly connected to the top of the mixing tank through a fixing component; each stirring rod is hollow and connected to the interior of the stirring main shaft, and each stirring rod has several discharge holes evenly distributed on it.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0019] The anti-corrosion coating provided by this invention achieves multi-functional integration of algae suppression and antibacterial properties, self-cleaning, corrosion prevention, heat insulation, and aging resistance through the synergistic effect of its components. It has significant performance advantages and is not only suitable for ships and marine engineering equipment, but also for coastal oil storage tanks, pipelines, high-speed railway bridges, outdoor steel structures, etc., and has broad application prospects.

[0020] This invention employs a premixed spraying equipment with a construction process that involves partial premixing followed by overall mixing. Component B is pre-injected into component A under high pressure and dispersion. Through shearing and turbulence, the viscosity of component B is initially reduced, thereby improving the uniformity and stability of the mixture between the two components.

[0021] This invention achieves smooth material transfer and pressure buffering in the premixing chamber through the coordinated action of the first and second telescopic cylinders and the linkage design between the second piston and the cylindrical core, avoiding sudden pressure changes during the mixing process. Combined with the dispersion spraying system consisting of the stirring shaft, stirring rod, and discharge hole, the premixed material can be evenly dispersed into the mixing tank, further ensuring the uniformity and stability of the final coating system. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the preparation steps of component A of this anti-corrosion coating; Figure 2 This is a schematic diagram of the preparation steps of component B of this anti-corrosion coating; Figure 3 This is a schematic diagram of the application method and steps for this anti-corrosion coating. Figure 4 A schematic diagram of the overall structure of the premixed spraying equipment used in the construction method; Figure 5 for Figure 4 The diagram shows a partial structure. Figure 6 This is a schematic diagram of a partial external structure of the premixing cylinder in this invention; Figure 7 for Figure 6 The diagram shows a partial cross-sectional view of the structure. Figure 8 for Figure 7 Enlarged schematic diagram of the structure at point A in the middle; Figure 9 This is a schematic diagram of the two-component suction feeding of the coating. Figure 10 for Figure 9 Enlarged schematic diagram of the structure at point B; Figure 11 A schematic diagram of the premixing structure of component B injected into component A; Figure 12 A schematic diagram of the structure for pressing premixed materials into a mixing tank; Figure 13This is a schematic diagram of a partial internal structure of the mixing tank in this invention; Figure 14 for Figure 13 Enlarged schematic diagram of the structure at point C; Figure 15 This is a partial cross-sectional schematic diagram of the stirring shaft and stirring rod.

[0023] In the diagram: 01, Premixing chamber; 02, Inlet hole; 1, Mixing tank; 11, Discharge pump; 12, Spray gun; 13, Mixing shaft; 131, Agitator blade; 14, Mixing rod; 15, Discharge hole; 2, Premixing cylinder; 201, Limiting boss; 21, Guide pipe; 211, Valve; 212, Rotary joint; 213, Fixing component; 22, Suction pipe; 3, Temporary storage tank; 4, Cylindrical core; 401, Sealing ring; 402, One-way spray hole; 41, First telescopic cylinder; 42, First connecting rod; 43, Connecting frame; 5, First piston component; 51, Second telescopic cylinder; 52, Second connecting rod; 6, Second piston component; 61, Guide rod; 62, Spring; 7, Drive gear; 71, First rack; 72, Second rack; 8, Push plate. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the embodiments.

[0025] This invention is not limited to the specific embodiments listed below. Those skilled in the art can implement this invention using various other specific embodiments based on the content disclosed herein. Any modifications or alterations made to the design structure and concept of this invention fall within the protection scope of this invention. It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. Furthermore, experimental methods not specifically described in the following embodiments are generally performed under conventional conditions or as recommended by the manufacturer.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] This algae-inhibiting, antibacterial, self-cleaning, and anti-corrosion coating consists of component A and component B. During application, component A and component B should be mixed thoroughly before use.

[0028] The raw materials for component A are as follows (brand names are in parentheses): Xylene was purchased from Changzhou Kangmeng Chemical Co., Ltd. Butyl acetate, purchased from Changzhou Kangmeng Chemical Co., Ltd.; Propylene glycol methyl ether acetate was purchased from Changzhou Kangmeng Chemical Co., Ltd. The fluorinated vinyl ether copolymer was purchased from Shanghai Dongfu Chemical Technology Co., Ltd. (JF-2X). Organosilicon-modified polyacrylate resin was purchased from Jiangsu Shisong New Material Technology Co., Ltd. (SS-179). Dispersant, purchased from BYK Chemicals (BYK-163); Organic bentonite, purchased from Zhejiang Chang'an Renheng Technology Co., Ltd. (C70). Rutile titanium dioxide, purchased from DuPont, USA (R-902). Near-infrared reflective titanium dioxide, purchased from Jiangsu Panhua Chemical Technology Co., Ltd. (IR-1000). Long-lasting protective bactericide, purchased from Limin Chemical Co., Ltd. (DSX-95). Precipitated barium sulfate was purchased from Changzhou Jingding Chemical Co., Ltd. Leveling agent, purchased from BYK Chemicals (BYK-306); Polymer preservative, purchased from Nanjing Tianshilandun Biotechnology Co., Ltd. (PT-205).

[0029] The raw materials for component A are as follows (the brand name is in parentheses): Trimeric isocyanate resin, purchased from Wanhua Chemical (HT-100). Anhydrous butyl acetate was purchased from Changzhou Kangmeng Chemical Co., Ltd.

[0030] Example 1 Take 4 kg of xylene, 1.6 kg of butyl acetate, 4 kg of propylene glycol methyl ether acetate, 45 kg of fluoroethylene-vinyl ether copolymer, 4 kg of organosilicon modified polyacrylate resin, and 1 kg of dispersant and add them to the dispersion vessel. Disperse them evenly at a speed of 400 r / min. Add 1 kg of organobentonite, 12 kg of rutile titanium dioxide, 12 kg of near-infrared reflective titanium dioxide, 7 kg of long-lasting protective bactericide, and 7 kg of precipitated barium sulfate to the dispersion vessel and disperse them at a high speed of 600 r / min for 30 min. After testing to ensure there are no large particles visible to the naked eye, the material is ground, with the grinding temperature controlled at ≤50℃. The material is ground using a sand mill until the fineness is <20μm. The qualified material is then fed into a paint mixing tank, stirred evenly at room temperature, and 0.4kg of leveling agent and 1kg of polymer preservative are added. The mixture is stirred for another 15 minutes until it is evenly mixed. After sampling and testing to ensure its performance is qualified, component A is obtained. The mixture is then filtered through a 150-mesh silk cloth and packaged in drums. Take 10 kg of trimer isocyanate resin and 5 kg of anhydrous butyl ester and add them to a mixing tank. Stir at 300 r / min for 20 min until uniform. After sampling and testing to ensure that the performance is qualified, component B is obtained and packaged in drums. Example 2

[0031] The difference between this embodiment and Embodiment 1 is that the amount of each raw material added is different, as detailed below: Xylene 3kg, Butyl acetate 1kg, Propylene glycol methyl ether acetate 3kg, Vinyl fluoride-vinyl ether copolymer 50kg, Organosilicon modified polyacrylate resin 3kg, Dispersant 0.9kg, Organobentonite 0.9kg, Rutile titanium dioxide 10kg, Near-infrared reflective titanium dioxide 10kg, Long-lasting protective bactericide 8kg, Precipitated barium sulfate 8kg, Leveling agent 0.5kg, Polymer preservative 1kg, Trimeric isocyanate resin 8kg, Anhydrous butyl acetate 4kg. Example 3

[0032] The difference between this embodiment and Embodiment 1 is that the amount of each raw material added is different, as detailed below: Xylene 5kg, Butyl acetate 1.4kg, Propylene glycol methyl ether acetate 5kg, Vinyl fluoride-vinyl ether copolymer 46kg, Organosilicon modified polyacrylate resin 6kg, Dispersant 1.5kg, Organobentonite 1kg, Rutile titanium dioxide 11kg, Near-infrared reflective titanium dioxide 11kg, Long-lasting protective bactericide 5kg, Precipitated barium sulfate 5kg, Leveling agent 0.6kg, Polymer preservative 1.5kg, Trimeric isocyanate resin 13kg, Anhydrous butyl acetate 5kg.

[0033] Compare with Example 1 The difference from Example 1 is that: the organosilicon-modified polyacrylate resin is removed from component A, the amount of fluorinated vinyl ether copolymer added is adjusted to 50 kg, and the other components and weights are the same as in Example 1. Component B is the same as in Example 1, and the preparation methods of components A and B are the same as in Example 1.

[0034] Compare with Example 2 The difference from Example 1 is that: near-infrared reflective titanium dioxide is removed from component A, the amount of rutile titanium dioxide added is adjusted to 25 kg, other components and proportions are the same as in Example 1, component B is the same as in Example 1, and the preparation methods of components A and B are the same as in Example 1.

[0035] Compare with Example 3 The difference from Example 1 is that: the long-lasting protective bactericide and polymer preservative are removed from component A, and the amount of precipitated barium sulfate added is adjusted to 15 kg. Other components and proportions are the same as in Example 1; component B is the same as in Example 1; the preparation methods of components A and B are the same as in Example 1.

[0036] Performance testing The performance of the examples and control examples was tested according to the following standards (in the testing, components A and B in each example and control example were used in combination): The anti-algae properties of Examples 1-3 and Control Examples 1-3 were tested according to GB / T 21353-2008 "Determination of Algae Resistance of Coating Films". The antibacterial rates of Examples 1-3 and Control Examples 1-3 were tested according to GB / T 21866-2008 "Determination of Antibacterial Properties and Antibacterial Effects of Antibacterial Coatings and Films". Water contact angle: The static contact angle of distilled water on the coating surface was measured using a contact angle measuring instrument; The anti-corrosion coating was applied to Q235 steel plate according to GB / T10125-2021 standard, with a dry film thickness of 80±10μm. Test conditions: 5% NaCl solution, temperature 35±2℃, relative humidity 95±5%, continuous spraying until obvious corrosion appeared on the coating, and the salt spray resistance time was recorded. According to GB / T1865-2009 standard, xenon lamp aging test was used to conduct artificial accelerated aging performance testing, and the time taken for the coating to show chalking and cracking was recorded. The test results are shown in Table 1.

[0037] Table 1 Performance test results of the examples and control examples

[0038] As shown in Table 1, the algae-inhibiting, antibacterial, self-cleaning, and anti-corrosion coatings of Examples 1-3 have significantly better overall performance than those of Control Examples 1-3. The influence of each key component on the coating performance is analyzed as follows: Examples 1-3 all had an algae inhibition level of 1 and an antibacterial rate of ≥99.2%, while Control Example 3, due to the lack of long-lasting protective bactericide and polymer preservative, had an algae inhibition level of 3 and an antibacterial rate of only 82.5%. This indicates that long-lasting protective bactericide and polymer preservative are key components of coatings that have algae inhibition and antibacterial capabilities, and can effectively inhibit the attachment and reproduction of microorganisms and prevent biofilm formation.

[0039] In Examples 1-3, the water contact angle was >110°. In Control Example 1, the water contact angle dropped sharply to 82.4° due to the removal of silicone-modified polyacrylate resin. This shows that silicone-modified polyacrylate resin can improve the hydrophobicity of the coating, reduce the adhesion of pollutants and microorganisms, and achieve a self-cleaning effect.

[0040] The salt spray resistance time of Examples 1-3 is >1500h. The salt spray resistance time of Control Example 1, which lacks silicone-modified polyacrylate resin, is reduced to 1050h. The salt spray resistance time of Control Example 3, which lacks bactericidal and anti-corrosion components, is only 1220h. This shows that silicone-modified polyacrylate resin can not only increase the water contact angle of the paint film and improve the self-cleaning ability of the paint film, but also enhance the density and weather resistance of the coating. Long-lasting bactericides and preservatives can inhibit microbial corrosion, and the two work together to improve the anti-corrosion life of the coating.

[0041] The artificial accelerated aging time of Examples 1-3 was ≥2200h, while the aging time of Control Example 1, which lacked silicone-modified polyacrylate resin, was reduced to 1800h. This indicates that silicone-modified polyacrylate resin can improve the coating's resistance to ultraviolet aging, enhance its resistance to chalking and cracking, and extend its service life.

[0042] The solar reflectance, near-infrared reflectance, and hemispherical emissivity of Examples 1-3 and Control Examples 1-3 were tested according to standard GB / T 25261-2018, and the test results are shown in Table 2.

[0043] Table 2 Performance test results of the examples and control examples (II)

[0044] Examples 1-3 have a solar reflectance ≥0.82, a near-infrared reflectance ≥0.72, and a hemispherical emissivity ≥0.87. In contrast, after removing near-infrared reflective titanium dioxide from Control Example 2, the solar reflectance is only 0.45, the near-infrared reflectance is reduced to 0.42, and the hemispherical emissivity is reduced to 0.75. This demonstrates that near-infrared reflective titanium dioxide is the key component for achieving excellent thermal insulation performance in this coating. Its highly efficient reflection of near-infrared radiation significantly improves the solar reflectance, near-infrared reflectance, and hemispherical emissivity of the coating, thereby effectively reducing the surface temperature of the coating. This not only directly enhances the thermal insulation effect of the coating but also indirectly improves the coating's anti-algae, antibacterial, and anti-aging properties by inhibiting a suitable temperature and humidity environment for microbial growth.

[0045] In summary, the anti-corrosion coating provided by this invention achieves multi-functional integration of algae suppression and antibacterial properties, self-cleaning, corrosion prevention, heat insulation, and aging resistance through the synergistic effect of its components. It has significant performance advantages and is not only suitable for ships and marine engineering equipment, but also for coastal oil storage tanks, pipelines, high-speed railway bridges, outdoor steel structures, etc., and has broad application prospects.

[0046] Please see Figures 4-15This invention provides a premixed spraying device for the application of algae-inhibiting, antibacterial, self-cleaning, and anti-corrosion coatings. The premixed spraying device uses a mobile cart as its base, facilitating overall mobile operation. The device mainly includes a mixing tank 1, a spray gun 12, a premixing cylinder 2, and a temporary storage tank 3. The mixing tank 1 is mounted on the mobile cart and has an inlet for material feeding. A discharge pump 11 is installed on one side of the bottom of the mixing tank 1, and the discharge pump 11 is connected to the spray gun 12 through a feed pipe. The spray gun 12 adopts existing conventional technology and the spraying pressure is adjustable. The premixing cylinder 2 is mounted above the mixing tank 1 via a support frame, and the temporary storage tank 3 is mounted on the upper side of the premixing cylinder 2 via a support frame.

[0047] like Figure 7 and Figure 8 As shown, a cylindrical core 4 is installed inside the premixing cylinder 2. Multiple sealing rings 401 are embedded on the outer wall of the cylindrical core 4. The cylindrical core 4 and the sealing rings 401 constitute a piston body that slides and matches the inner wall of the premixing cylinder 2. A first piston component 5 is installed inside the cylindrical core 4. A first telescopic cylinder 41 for driving the cylindrical core 4 to rise and fall, and a second telescopic cylinder 51 for driving the first piston component 5 to rise and fall, are provided above the premixing cylinder 2. The side of the premixing cylinder 2, located below the cylindrical core 4, is connected to the mixing tank 1. The internally connected feed pipe 21 is equipped with a valve 211. The side of the premixing cylinder 2 is connected to the suction pipe 22 above the feed pipe 21, which is connected to the bottom of the temporary storage tank 3. The side of the cylindrical core 4 and near its bottom end is provided with an inlet hole 02. A one-way valve (not shown in the figure) is installed in the inlet hole 02. The one-way valve guides the flow from the outside of the cylindrical core 4 to the inside of the cylindrical core 4. When the cylindrical core 4 moves to the limit position, the inlet hole 02 is aligned and connected with the suction pipe 22.

[0048] Several unidirectional injection holes 402 are evenly distributed on the bottom end face of the cylindrical core 4. The flow direction of the unidirectional injection holes 402 is from the inside of the cylindrical core 4 to the outside of the cylindrical core 4. The specific unidirectional flow structure adopts the existing technology, which will not be described in detail in this application. A limiting boss 201 is fixed on the inner wall of the premixing cylinder 2 at the same height as the feed pipe 21. The bottom of the cylindrical core 4 abuts against the upper surface of the limiting boss 201 to block it. The limiting boss 201 is used to limit the extreme position of the downward movement of the cylindrical core 4 to prevent the cylindrical core 4 from moving too far downward and blocking the feed pipe 21.

[0049] A second piston 6 is installed inside the premixing cylinder 2 below the limiting boss 201. A premixing cavity 01 is formed inside the premixing cylinder 2 between the cylindrical core 4 and the second piston 6. The top of the second piston 6 abuts against the lower surface of the limiting boss 201, thereby limiting the upward movement of the second piston 6 to its extreme position and preventing it from excessively moving upward and blocking the guide pipe 21. A vertically extending spring 62 is provided inside the premixing cylinder 2 below the second piston 6. The top of the spring 62 is fixed to the lower surface of the second piston 6, and the bottom end is fixed to the bottom wall of the premixing cylinder 2. The spring 62 provides elastic support for the second piston 6.

[0050] In addition, the top and bottom of the premixing cylinder 2 are provided with holes that connect the inside and outside, so that when the cylindrical core 4 and the second piston 6 are adjusted up and down, the space above the cylindrical core 4 or the space below the second piston 6 in the premixing cylinder 2 can maintain air pressure balance with the outside.

[0051] like Figure 6 and Figure 7 As shown, the first telescopic cylinder 41 is fixed above the premixing cylinder 2 by a bracket. The top of the cylindrical core 4 is fixed with a first connecting rod 42. The first connecting rod 42 extends vertically upward through the top of the premixing cylinder 2. The telescopic end of the first telescopic cylinder 41 faces downward and is fixedly connected to the top of the first connecting rod 42 by a connecting bracket 43. The first connecting rod 42 is a hollow body. The second telescopic cylinder 51 is fixed on the top of the first connecting rod 42. The telescopic end of the second telescopic cylinder 51 extends into the interior of the first connecting rod 42 and is fixed with the second connecting rod 52. The second connecting rod 52 extends vertically downward through the interior of the cylindrical core 4 and is fixedly connected to the top of the first piston 5. This allows the first piston 5 to be adjusted up and down synchronously with the cylindrical core 4, and also to be adjusted up and down independently.

[0052] When using this equipment for coating application, firstly, the first telescopic cylinder 41 extends, pushing the cylindrical core 4 downwards to its limit position, with the lower surface of the cylindrical core 4 contacting the upper part of the limiting boss 201. Simultaneously, the second telescopic cylinder 51 extends, pushing the first piston 6 downwards to the bottom of the cylindrical core 4. Under the elastic support of the spring 62, the second piston 6 contacts the lower part of the limiting boss 201. At this time, if... Figure 7 As shown, the entire device remains in its initial state; Add all the weighed component A into mixing tank 1, and add all the weighed component B into temporary storage tank 3. Adjust valve 211 to the open position. Figure 9 As shown, the first telescopic cylinder 41 retracts until it drives the cylindrical core 4, the first piston 5, and the second telescopic cylinder 51 to move upwards to their limit position (at which point, as shown in the diagram). Figure 10 As shown, the suction tube 22 is aligned and connected to the inlet hole 02. The piston body formed by the cylindrical core 4 and the sealing ring 401 cooperates with the inner wall of the premixing cylinder 2, as shown. Figure 9 As shown by the solid arrow, component A inside the mixing tank 1 is drawn into the premixing chamber 01. Then, the second telescopic cylinder 51 retracts, causing the first piston 5 to slide upwards along the inner wall of the cylindrical core 4. Figure 9 As shown by the dashed arrow in the image, component B in the temporary storage tank 3 is drawn into the cylindrical core 4 through the suction pipe 22; Subsequently, with the regulating valve 211 closed, the second telescopic cylinder 51 extends, pushing the first piston 5 to force component B inside the cylindrical core 4 through the one-way injection hole 402 into the premixing chamber 01. Figure 11 As shown by the arrow, component B is injected downwards at high pressure from the one-way injection hole 402 into the premixing chamber 01, where it can mix with component A in the premixing chamber 01 to obtain a premix. When component B is forced into component A, the pressure inside premixing chamber 01 increases, such as Figure 11 As shown, the spring force of spring 62 will overcome the downward push of the second piston 6 (spring 62 is compressed and stored) to increase the volume of premixing chamber 01 and buffer and balance the pressure in premixing chamber 01. Subsequently, adjusting valve 211 is in the open state, the first telescopic cylinder 41 extends and pushes the cylindrical core 4 downward, as follows. Figure 12 As shown by the arrow, the premixed material in the premixing chamber 01 can be pressurized to the mixing tank 1 through the feed pipe 21. The premixed liquid is mixed with the remaining component A, and then stirring is continued. The above achieves the premixing of component B with a portion of component A.

[0053] The premixing process employed in this invention involves injecting component B into component A at high speed via pressure. When component B enters component A at a high speed through the one-way injection hole 402, a velocity difference is formed between the jet and the surrounding relatively stationary liquid, thereby generating a strong shearing effect. This shearing force can effectively overcome the surface tension and cohesive resistance of component B itself, causing it to be broken and fragmented into finer droplets, significantly increasing the specific surface area of ​​the two-phase contact. At the same time, the high-speed jet will induce violent turbulence in the fluid within the premixing chamber 01, forming vortex and disturbance effects, which will cause the fine droplets formed by the fragmentation of component B to rapidly diffuse and distribute into the surrounding component A.

[0054] Because component B has a high viscosity, simply stirring it directly with component A can easily lead to low mixing efficiency and poor uniformity due to the large viscosity difference. Premixing via the high-pressure injection method essentially uses mechanical force to physically refine and disperse the high-viscosity component into a low-viscosity medium, reducing the viscosity gradient within the system. This creates more uniform initial conditions for subsequent overall mixing in mixing tank 1, effectively improving the uniformity and stability of the final fusion of the two components.

[0055] If the amount of component B used is large and one operation cannot completely use up the component B in the temporary storage tank 3, the above steps can be repeated multiple times until the component B in the temporary storage tank 3 is completely drained.

[0056] After the mixing tank 1 has finished mixing, the paint in the mixing tank 1 is pumped to the spray gun 12 by the discharge pump 11, and normal spraying operation can be carried out.

[0057] Furthermore, the side of the premixing cylinder 2 is also provided with a linkage pushing mechanism, which is used to link the second piston 6 to move upward synchronously when the first telescopic cylinder 41 pushes the cylindrical core 4 downward, so as to press the premixed material into the mixing tank 1 through the guide pipe 21. The bottom of the second piston 6 is fixed with a guide rod 61 that extends vertically downward to the outside of the premixing cylinder 2. A spring 62 is arranged around the guide rod 61. The linkage pushing mechanism includes a drive gear 7, a first rack 71, a second rack 72 and a push plate 8. The drive gear 7 is rotatably mounted on the side of the premixing cylinder 2 through a U-shaped seat. The first rack 71 is vertically mounted on the side of the connecting frame 43. The second rack 72 is vertically limited and slidably mounted on the side of the premixing cylinder 2. The bottom end of the second rack 72 extends to the bottom of the premixing cylinder 2 and is fixed with a push plate 8 that abuts against the bottom end of the guide rod 61. The first rack 71 and the second rack 72 mesh with the drive gear 7 from both sides respectively.

[0058] During the process of the first telescopic cylinder 41 retracting and driving the cylindrical core 4 to move upward to the limit position, the connecting frame 43 drives the first rack 71 to move upward synchronously. The upward first rack 71 meshes with the drive gear 7 to rotate. The rotating drive gear 7 meshes with the second rack 72 and the push plate 8 to move downward. The downward movement of the push plate 8 can provide clearance space for the pressure in the premixing chamber 01 of the second piston 6 to move downward.

[0059] When the first telescopic cylinder 41 extends and pushes the cylindrical core 4 downward to press the premixed material in the premixing chamber 01 into the mixing tank 1, the first rack 71 moves downward synchronously with the connecting frame 43. The downward first rack 71 meshes with the drive gear 7 to reverse, and the reverse drive gear 7 meshes with the second rack 72 and the push plate 8 to move upward synchronously. The upward push plate 8 cooperates with the bottom end of the guide rod 61 to push the second piston 6 upward synchronously. The downward cylindrical core 4 and the upward second piston 6 move closer to each other and are finally limited to the upper and lower parts of the limiting boss 201, which facilitates the complete discharge of the premixed material in the premixing chamber 01 and avoids excessive residue in the premixing chamber 01.

[0060] like Figure 13As shown, a stirring shaft 13 is vertically and rotatably installed inside the stirring tank 1, with the top end of the stirring shaft 13 extending through to the top of the stirring tank 1. Several stirring rods 14 are evenly distributed on the outer wall of the stirring shaft 13, and an agitator blade 131 is installed at the bottom end of the stirring shaft 13. A drive device for driving the stirring shaft 13 to rotate is provided at the top of the stirring tank 1. The drive device adopts existing technology and specifically includes a drive motor and a gear set. The gear set consists of a main gear and a driven gear. The main gear is mounted on the output shaft of the drive motor, and the driven gear is mounted on the top end of the stirring shaft 13. The drive motor drives the main gear to rotate, and the main gear meshes with and drives the driven gear and the stirring shaft 13 to rotate.

[0061] The rotating stirring shaft 13 drives the stirring blade 131 and the stirring rod 14 to rotate synchronously. The stirring blade 131 is located at the bottom of the mixing tank 1, which plays a role in stirring and preventing sedimentation. The stirring rod 14 is used for mixing the coating.

[0062] like Figure 14 and Figure 15 As shown, the stirring shaft 13 is a hollow structure with an open top and a sealed bottom. The end of the guide pipe 21 is rotatably connected to the top of the stirring shaft 13 via a rotating joint 212, enabling the guide pipe 21 and the stirring shaft 13 to rotate relative to each other. The guide pipe 21 is fixedly connected to the top of the mixing tank 1 via a fixing member 213, preventing the guide pipe 21 from rotating synchronously with the stirring shaft 13. Each stirring rod 14 is hollow and connected to the interior of the stirring shaft 13. Each stirring rod 14 has several discharge holes 15 evenly distributed on it. The premixed material pressed into the guide pipe 21 enters the stirring shaft 13 and flows through the stirring shaft 13 to each stirring rod 14. Finally, it is injected into component A in the mixing tank 1 through each discharge hole 15. The points of the multiple discharge holes 15 are evenly distributed to ensure that the premixed material is evenly distributed in the component A, further improving the uniformity of the mixing of the two components.

[0063] As the cylindrical core 4 moves upward, when component A in the mixing tank 1 is drawn into the premixing chamber 01, component A in the mixing tank 1 enters the premixing chamber 01 sequentially through the discharge hole 15, the stirring rod 14, the stirring main shaft 13, and the guide pipe 21 (it is necessary to ensure that the liquid level is higher than the uppermost discharge hole 15 to avoid only gas being drawn into the premixing chamber 01), so that the local extraction of component A and the delivery of premixed material are carried out in the same pipeline system.

[0064] In addition, the downward cylindrical core 4 and the upward second piston 6 move closer to each other, which also provides greater pressure drive, so that the premixed material is finally injected into the A component in the mixing tank 1 from the multi-point discharge hole 15, which again achieves the effect of jet mixing and further improves the uniformity of mixing.

[0065] Example 4 In this embodiment, the premixed spraying equipment described above is used as the construction equipment for this coating. The components A and B obtained in Example 1 are weighed at a weight ratio of 10:1. First, all of the components A are put into the mixing tank 1 and stirred for 3 minutes to disperse the sediment at the bottom. Then, a certain amount of components A is extracted from the mixing tank 1 into the premixing chamber 01, and components B are extracted from the temporary storage tank 3 into the cylindrical core 4. The components B are injected into the components A in the premixing chamber 01 through the one-way spray hole 402 using pressure to premix them and obtain the premixed material. Add the premixed material in premix chamber 01 to mixing tank 1, mix it with the remaining component A, and add diluent (made by mixing xylene and butyl acetate in a 1:1 ratio, the amount added shall not exceed 5% of the total weight of the mixed coating) to adjust the viscosity to 20s (Ford-4 cup), and continue stirring for 10 minutes until the two components are completely mixed and there is no visible layering or sedimentation. Let it stand for 20 minutes to allow the bubbles to escape naturally. Adjust the spray gun pressure to 0.5MPa, keep the distance between the nozzle and the substrate at 20cm, and control the spray thickness to 60μm dry film. Allow the coating to cure naturally for 2-4 hours in the construction environment, until it is no longer sticky to the touch. Continue curing for 24-48 hours, until scratching the coating with a fingernail leaves no mark, indicating that the coating is fully cured.

[0066] Example 5 The difference between this embodiment and embodiment 4 is that the components A and B prepared in embodiment 2 are used for construction, and the construction method is the same as that in embodiment 4.

[0067] Compare with Example 4 In this embodiment, the KL-16B Raindrop Intelligent Automatic Spraying Equipment was used as the application equipment for this coating. The components A and B prepared in Example 1 were weighed at a weight ratio of 10:1. First, all of the components A were added to the automatic spraying equipment and stirred for 3 minutes to disperse the sediment at the bottom. Then, all of the components B were added to the automatic spraying equipment, and a thinner (made by mixing xylene and butyl acetate in a 1:1 ratio, with the amount added not exceeding 5% of the total weight of the mixed coating) was added to adjust the viscosity to 20s (Ford Cup 4). The mixture was then stirred for another 10 minutes until the two components were completely mixed and there was no visible layering or sedimentation. The mixture was allowed to stand for 20 minutes to allow the bubbles to escape naturally. The subsequent application method was the same as in Example 4.

[0068] Compare with Example 5 The difference between this comparative example and comparative example 4 is that the components A and B prepared in Example 2 were used for construction, and the construction method was the same as that in comparative example 4.

[0069] Furthermore, the substrate material and size, spraying environment (temperature controlled at 5-35℃, relative humidity <85%, substrate surface temperature 3℃ higher than dew point temperature), and spraying area of ​​Examples 4, 5, Comparative Examples 4 and 5 were all the same.

[0070] Performance testing According to the standard GB / T 13452.2-2008 "Determination of film thickness of paints and varnishes", ten test points were randomly selected in the sprayed area (one point per 1m²) to test the dry film thickness. The results are as follows: The measured dry film thicknesses at the ten detection points in Example 4 were 61 μm, 59 μm, 62 μm, 60 μm, 58 μm, 61 μm, 60 μm, 59 μm, 62 μm, and 58 μm, respectively, with an average thickness of 59.9 μm, a maximum deviation of ±2.1 μm, and an average deviation of ±1.2 μm. The thickness uniformity was excellent, with no local thickening or thinning. The measured dry film thicknesses at the ten detection points in Example 5 were 63μm, 61μm, 60μm, 62μm, 64μm, 61μm, 63μm, 60μm, 62μm, and 61μm, respectively, with an average thickness of 61.7μm, a maximum deviation of ±2.3μm, and an average deviation of ±1.5μm. The thickness distribution was uniform and met the design requirements. The measured dry film thicknesses at the ten test points in Comparative Example 4 were 55 μm, 68 μm, 57 μm, 70 μm, 59 μm, 66 μm, 56 μm, 69 μm, 58 μm, and 67 μm, respectively, with an average thickness of 62.5 μm, a maximum deviation of ±7.5 μm, and an average deviation of ±4.8 μm. The thickness fluctuated significantly, indicating poor uniformity. The measured dry film thicknesses at the ten detection points in Comparative Example 5 were 54 μm, 69 μm, 56 μm, 71 μm, 58 μm, 67 μm, 55 μm, 70 μm, 57 μm, and 68 μm, respectively, with an average thickness of 63.3 μm, a maximum deviation of ±8.3 μm, and an average deviation of ±5.2 μm. The thickness uniformity was poor, with multiple detection points showing either too thick or too thin.

[0071] According to GB / T 9286-2021 "Cross-cut Test for Paints and Varnishes", with a cross-cut spacing of 1mm, after applying 3M tape and quickly peeling it off, the results are as follows: In Example 4, the coating showed only very slight peeling at the edges of a few grids, with a peeling area of ​​2.3% and an adhesion rating of 1. The coating was tightly bonded to the substrate. In Example 5, the coating showed no obvious peeling, with only a small amount of peeling at the two corners of the grid, covering an area of ​​1.8%. The adhesion rating was 1, indicating good bonding stability between the substrate and the coating. In contrast, the coating in Example 4 showed obvious peeling within four grids, with some grid edges showing continuous peeling. The peeling area was 7.6%, and the adhesion level was 2. In some areas, the coating was not fully cross-linked due to uneven mixing of the coating, resulting in insufficient adhesion between the coating and the substrate. In Comparative Example 5, the coating peeled off within 5 grids, with some areas showing coating delamination. The peeled area was 8.2%, and the adhesion level was 2, indicating insufficient bonding between the coating and the substrate.

[0072] The results show that the coating application method using the premixed spraying equipment provided by this invention can significantly improve the coating thickness uniformity and adhesion compared with the traditional simple mixing method. In the examples, the coating thickness deviation is small and the adhesion level is high. The premixing process reduces the viscosity of component B in advance by high pressure jet, improves the uniformity of subsequent component mixing, and ensures the consistency and stability of coating performance.

[0073] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Therefore, the present invention will not explain the control method and circuit connection in detail.

[0074] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. A method for applying an algae-inhibiting, antibacterial, self-cleaning, and anti-corrosion coating, characterized in that: The algae-inhibiting, antibacterial, self-cleaning, and anti-corrosion coating comprises component A and component B, which are mixed during application. The ingredients of component A, by weight, include: 3-5 parts xylene, 1-2 parts butyl acetate, 3-5 parts propylene glycol methyl ether acetate, 40-55 parts fluoroethylene-vinyl ether copolymer, 2-6 parts organosilicon-modified polyacrylate resin, 0.5-1.5 parts dispersant, 0.8-1.2 parts organobentonite, 10-15 parts rutile titanium dioxide, 10-15 parts near-infrared reflective titanium dioxide, 5-10 parts long-lasting protective bactericide, 5-10 parts precipitated barium sulfate, 0.3-0.6 parts leveling agent, and 0.5-1.5 parts polymer preservative. The long-lasting protective bactericide was DSX-95 purchased from Limin Chemical Co., Ltd. The ingredients of component B, by mass parts, include: 7.5-15 parts of trimer isocyanate resin and 3-5 parts of anhydrous butyl ester; The application method for the algae-inhibiting, antibacterial, self-cleaning, and anti-corrosion coating involves using premixed spraying equipment to ensure good ventilation in the application environment. The ambient temperature should be controlled between 5-35℃, relative humidity <85%, and the substrate surface temperature should be at least 3℃ above the dew point temperature. The specific steps include: Surface treatment: Degreasing, rust removal, repair, and dust removal of the substrate; Premixing: Weigh the components A and B accurately according to the weight ratio of 10:

1. First, put all of the components A into the mixing tank (1) and stir for 3-5 minutes to break up the sediment at the bottom. Then, extract a certain amount of components A from the mixing tank (1) into the premixing chamber (01). Extract components B from the temporary storage tank (3) into the cylindrical core (4). Use pressure to inject components B into components A in the premixing chamber (01) through the one-way injection hole (402) to premix and obtain the premixed material. Dilution and remixing: The premixed material in the premix chamber (01) is put into the mixing tank (1), mixed with the remaining component A, and a diluent is added to adjust the viscosity to 20-25s. Then, the mixture is stirred for 10 minutes until the two components are completely blended and there is no visible layering or sedimentation. Let it stand for 20 minutes to allow the bubbles to escape naturally. Coating: Adjust the pressure of the spray gun (12) to 0.3-0.5MPa, keep the distance between the nozzle and the substrate at 20-30cm, and control the coating thickness to 60-80μm dry film. Drying and curing: Allow to cure naturally in the application environment for 2-4 hours, until the coating is no longer sticky to the touch. Continue curing for 24-48 hours, until scratching the coating with a fingernail leaves no mark, indicating that the coating is fully cured. The premixed spraying equipment includes a mixing tank (1), a spray gun (12), a premixing cylinder (2), and a temporary storage tank (3). A discharge pump (11) is installed on one side of the bottom of the mixing tank (1), and the discharge pump (11) is connected to the spray gun (12) through a feed pipe; The premixing cylinder (2) is mounted above the mixing tank (1) by a support frame, and the temporary storage tank (3) is mounted above the side of the premixing cylinder (2) by a support frame; The premixing cylinder (2) is equipped with a cylindrical core (4), and multiple sealing rings (401) are embedded on the outer wall of the cylindrical core (4). The cylindrical core (4) and the sealing rings (401) constitute a piston body that slides and matches the inner wall of the premixing cylinder (2). A first piston component (5) is matched and installed inside the cylindrical core (4). The premixing cylinder (2) is provided with a first telescopic cylinder (41) for driving the cylindrical core (4) to lift and adjust and a second telescopic cylinder (51) for driving the first piston (5) to lift and adjust. The premixing cylinder (2) is connected to a feed pipe (21) that communicates with the inside of the mixing tank (1) at the side below the cylindrical core (4), and a valve (211) is installed on the feed pipe (21). The premixing cylinder (2) is connected to a suction pipe (22) above the feed pipe (21) on its side, which is connected to the bottom of the temporary storage tank (3). The cylindrical core (4) is provided with an inlet hole (02) on its side and near its bottom end. When the cylindrical core (4) moves to the limit position, the inlet hole (02) is aligned and connected with the suction tube (22). The bottom end face of the cylindrical core (4) is evenly distributed with several unidirectional injection holes (402). A limiting boss (201) is fixed on the inner wall of the premixing cylinder (2) at the same height as the feed pipe (21). The bottom of the cylindrical core (4) abuts against the upper surface of the limiting boss (201); A second piston (6) is installed inside the premixing cylinder (2) below the limiting boss (201), and a premixing cavity (01) is formed inside the premixing cylinder (2) between the cylindrical core (4) and the second piston (6). The top of the second piston (6) abuts against the lower surface of the limiting boss (201); A vertically extending spring (62) is provided inside the premixing cylinder (2) below the second piston (6). The top end of the spring (62) is fixed to the lower surface of the second piston (6), and the bottom end is fixed to the bottom wall inside the premixing cylinder (2).

2. The construction method of the algae-inhibiting, antibacterial, self-cleaning, and anti-corrosion coating according to claim 1, characterized in that: The preparation method of component A includes the following steps: Raw material mixing: Add xylene, butyl acetate, propylene glycol methyl ether acetate, fluoroethylene-vinyl ether copolymer, organosilicon modified polyacrylate resin and dispersant to the dispersion tank and disperse evenly at a speed of 300-500 r / min. Add organobentonite, rutile titanium dioxide, near-infrared reflective titanium dioxide, long-lasting protective bactericide and precipitated barium sulfate to the dispersion tank and disperse at a high speed of 600-800 r / min for 30 min. Grinding: After testing and confirming that there are no large particles visible to the naked eye, grind the material, controlling the grinding temperature to ≤50℃ and the material fineness to <20μm; Paint mixing: Pour the properly ground material into the paint mixing kettle, stir evenly at room temperature, then add leveling agent and polymer preservative, and continue stirring for 15 minutes until evenly mixed; Packaging: After passing the sampling test, the product is filtered through 150-mesh silk cloth and then packaged in drums; The preparation method of component B includes the following steps: Raw material mixing: Add the trimer isocyanate resin and anhydrous butyl ester to the mixing tank and stir at 300 r / min for 20 min until homogeneous; Packaging: After passing the performance test by sampling, the product is packaged in drums.

3. The construction method of the algae-inhibiting, antibacterial, self-cleaning, and anti-corrosion coating according to claim 1, characterized in that: The amount of thinner added shall not exceed 5% of the total weight of the mixed coating; The diluent is prepared by mixing xylene and butyl acetate in a 1:1 ratio.

4. The construction method of the algae-inhibiting, antibacterial, self-cleaning, and anti-corrosion coating according to claim 1, characterized in that: The first telescopic cylinder (41) is fixed above the premixing cylinder (2) by a bracket, and the top of the cylindrical core (4) is fixed with a first connecting rod (42), which extends vertically upward to the top of the premixing cylinder (2); The telescopic end of the first telescopic cylinder (41) faces downward and is fixedly connected to the top of the first connecting rod (42) via a connecting bracket (43); The first connecting rod (42) is a hollow body, and the second telescopic cylinder (51) is fixed on the top of the first connecting rod (42); The telescopic end of the second telescopic cylinder (51) extends into the interior of the first connecting rod (42) and is fixed with the second connecting rod (52). The second connecting rod (52) extends vertically downwards into the cylindrical core (4) and is fixedly connected to the top of the first piston (5).

5. The construction method of the algae-inhibiting, antibacterial, self-cleaning, and anti-corrosion coating according to claim 4, characterized in that: The side of the premixing cylinder (2) is also provided with a linkage pushing mechanism, which is used to link the second piston (6) to move upward synchronously when the first telescopic cylinder (41) pushes the cylindrical core (4) downward, so as to press the premixed material into the mixing tank (1) through the guide pipe (21); The bottom of the second piston (6) is fixed with a guide rod (61) that extends vertically downwards through the premixing cylinder (2) to the outside. The spring (62) is arranged around the guide rod (61); The linkage pushing mechanism includes a drive gear (7), a first rack (71), a second rack (72), and a push plate (8); The drive gear (7) is rotatably mounted on the side of the premixing cylinder (2) via a U-shaped seat, and the first rack (71) is vertically mounted on the side of the connecting frame (43); The second rack (72) is vertically and slidably mounted on the side of the premixing cylinder (2); The bottom end of the second rack (72) extends to the bottom of the premixing cylinder (2) and is fixed with the push plate (8) that abuts against the bottom end of the guide rod (61). The first rack (71) and the second rack (72) mesh with the drive gear (7) from both sides respectively.

6. The construction method of the algae-inhibiting, antibacterial, self-cleaning, and anti-corrosion coating according to claim 1, characterized in that: The mixing tank (1) is vertically and rotatably installed with a stirring main shaft (13), and the top end of the stirring main shaft (13) extends through to the top of the mixing tank (1). Several stirring rods (14) are evenly distributed on the outer wall of the stirring main shaft (13). The bottom end of the stirring main shaft (13) is equipped with stirring blades (131). The top of the mixing tank (1) is provided with a drive device for driving the mixing spindle (13) to rotate.

7. The construction method of the algae-inhibiting, antibacterial, self-cleaning, and anti-corrosion coating according to claim 6, characterized in that: The stirring spindle (13) is a hollow shape with an open top and a sealed bottom; The end of the feed pipe (21) is rotatably connected to the top of the stirring shaft (13) via a rotating joint (212), and the feed pipe (21) is fixedly connected to the top of the stirring tank (1) via a fixing part (213); Each of the stirring rods (14) is hollow and is connected to the inside of the stirring shaft (13). Each stirring rod (14) has several discharge holes (15) evenly distributed on it.

Images