Preparation method of mildew-proof coating in high-temperature and high-humidity environment

Abstract

The invention relates to the technical field of building coatings, in particular to a formula and preparation method of a mildew-proof coating in a high-temperature and high-humidity environment, and the preparation method comprises the following steps: putting fluorocarbon resin, pigment and titanium dioxide filler into a stirrer, stirring and mixing to obtain a first mixture; determining the addition amount of the mixed additive to add the mixed additive into the first mixture, and continuously stirring to obtain a second mixture; determining whether the dispersity of the mixture reaches the standard or not, and supplementing a mixing aid based on a result that the dispersity does not reach the standard; determining the dispersion stability characteristic value of the second mixture based on the volume of the settling layer, and determining the filtering pressure to remove impurities to obtain uniform slurry; determining the total addition amount of a biological mildew-proof bacteriostatic agent, and adding the biological mildew-proof bacteriostatic agent into the uniform slurry at a preset addition rate; and packaging the uniform slurry to obtain the mildew-proof coating finished product. The problem that the biological mildew preventive is difficult to fuse with the coating is solved.

Description

Technical Field

[0001] This invention relates to the field of architectural coatings technology, and in particular to a formulation and preparation method of an anti-mildew coating for high temperature and high humidity environments. Background Technology

[0002] In pharmaceutical and food production, high humidity, high temperature, and abundant nutrients in the production environment make the walls and ceilings of production workshops highly susceptible to mold and blackening. Ordinary paints will quickly develop mold and blackening after being applied. When the paint film is attacked by mold and microorganisms, the film-forming substances are dissolved, losing their resistance to the environment, until it discolors, chalks, and peels off. Even so-called "anti-mold paints" on the market have a short period of effectiveness and will also develop mold and blackening. Mold on the walls of production workshops seriously affects the hygiene and safety of food and pharmaceutical products. Therefore, the problem of mold on the walls of damp food and pharmaceutical production workshops has become a major headache for enterprises and a problem that must be solved.

[0003] Chinese Patent Publication No. CN107163758A discloses an anti-corrosion and anti-mildew coating. The main components of this coating are acrylic emulsion, cement, dioctyl phthalate, polyisocyanate, tannin, dicyandiamide, epoxy resin, nano anti-mildew particles, inorganic anti-corrosion filler, silane coupling agent, film-forming aid, leveling agent, and defoamer group as raw materials, which greatly improves the gloss, wear resistance and anti-corrosion and anti-mildew performance of the coating. In addition, epoxy resin and tannin are added.

[0004] However, this anti-mildew coating uses chemical anti-mildew agents, resulting in a short period of effectiveness and the possibility of mold growth and blackening, which seriously affects hygiene and safety. Summary of the Invention

[0005] Therefore, this invention provides a formulation and preparation method for an anti-mildew coating under high temperature and high humidity conditions, in order to overcome the problems of poor performance of chemical anti-mildew coatings and difficulty in integrating biological anti-mildew agents with coatings in the prior art.

[0006] To achieve the above objectives, in one aspect, the present invention provides a method for preparing an anti-mildew coating for high temperature and high humidity environments, comprising: Step S1: Fluorocarbon resin, pigment and titanium dioxide filler are put into a mixer and stirred and mixed. A viscosity curve is obtained based on the first viscosity during the mixing process to dynamically adjust the stirring rate and obtain the first mixture. Step S2: Determine the amount of mixing aid to be added based on the viscosity difference value obtained between the second viscosity and the preset viscosity of the first mixture, so as to add the mixing aid to the first mixture, and continue stirring for a preset time to obtain the second mixture; Step S3: Determine whether the dispersion of the mixture meets the standard based on the fineness of the largest particle agglomerate in the second mixture, and supplement the mixing aid according to the difference between the test result and the preset standard fineness based on the result that the dispersion of the mixture does not meet the standard. Step S4: Determine the dispersion stability characteristic value of the second mixture based on the volume of the sedimentation layer of the second mixture in the centrifugal sedimentation experiment, and determine the filtration pressure according to the dispersion stability characteristic value to remove impurities and obtain a uniform slurry. Step S5: Determine the total amount of biological antifungal and antibacterial agent to be added to the uniform slurry based on the difference between the dispersion stability characteristic value of the uniform slurry and the preset characteristic threshold. Step S6: Package the uniform slurry to obtain the finished anti-mildew coating.

[0007] Further, in step S1, the process of dynamically adjusting the stirring rate includes: Step S11: The fluorocarbon resin, the pigment, and the titanium dioxide filler are placed into a mixer in a preset mass ratio of 12:2:5 and stirred at a stirring speed of 100 rpm. Step S12: Based on the real-time acquired first viscosity, obtain the viscosity curve that changes over time to obtain the viscosity change amplitude value of the first viscosity within a preset unit time. Step S13: Compare and analyze the viscosity change range with a preset change range threshold, where the preset change range threshold is 1%. Step S14: Based on the result that the mixing time exceeds 30 minutes and the viscosity change value is greater than the preset change value, indicating that the raw materials are not mixed evenly, it is determined to increase the stirring speed by 20 rpm.

[0008] Further, in step S2, the process of determining the amount of the mixing additive includes: Step S21: The ratio of the difference between the preset viscosity and the second viscosity to the preset viscosity is determined as the viscosity difference value, where the preset viscosity is 287.0 mm² / s; Step S22: Compare and analyze the viscosity difference value with a preset viscosity difference threshold, wherein the preset viscosity difference threshold is 0.09; Step S23: Based on the result that the viscosity difference value is greater than or equal to the preset viscosity difference threshold, determine to adjust and increase the amount of the mixing additive, or based on the result that the viscosity difference value is less than the preset viscosity difference threshold, determine to adjust and decrease the amount of the mixing additive. The second viscosity is characterized by the result obtained by the first mixture at 25°C; The magnitude of the increase / decrease in the amount of the mixed additive is positively correlated with the viscosity difference value. The adjustment value is the product of the viscosity difference value, the adjustment coefficient of the mixed additive, and the preset amount of the mixed additive.

[0009] Further, in step S3, the process of determining whether the dispersion of the mixture meets the standard includes: Step S31: The ratio of the difference between the maximum fineness and the preset standard fineness to the preset standard fineness is determined as the fineness difference value, where the preset standard fineness is 5 μm; Step S32: Compare and analyze the fineness difference value with a preset fineness difference threshold, wherein the preset fineness difference threshold is 0.13; Step S33: Based on the result that the fineness difference value is greater than or equal to the preset fineness threshold, determine to adjust and increase the amount of thixotropic agent added, or based on the result that the fineness difference value is less than the preset fineness threshold, determine that the dispersion uniformity meets the standard. The maximum fineness is characterized by the maximum fineness of the particles in the second mixture as detected by a scraper fineness meter; The magnitude of the increase in the amount of thixotropic agent added is positively correlated with the fineness difference value. The adjustment value is the product of the fineness difference value, the empirical adjustment coefficient of the thixotropic agent, and the amount of the preset mixed additive.

[0010] Further, in step S4, the process of determining the filtration pressure based on the dispersion stability characteristic value includes: Step S44: Compare and analyze the dispersion stability feature value with a preset stability threshold, wherein the preset stability threshold is 0.2; Step S45: Based on the result that the dispersion stability characteristic value is less than the preset stability threshold, it is determined to filter at a preset base pressure of 0.1 MPa; based on the result that the dispersion stability characteristic value is greater than or equal to the preset stability threshold, it is determined to adjust and increase the pressure before filtering. The magnitude of the pressure increase is positively correlated with the difference between the dispersion stability characteristic value and the preset stability threshold. The adjustment value is the difference between the dispersion stability characteristic value and the preset stability threshold and the preset base pressure of 0.1 MPa.

[0011] Further, in step S5, the process of determining the total amount of biological antifungal and antibacterial agent added includes: Step S51: Determine the fineness deviation value based on the difference between the maximum fineness and the preset standard fineness, and determine the dispersion stability deviation value based on the difference between the dispersion stability characteristic value and the preset stability threshold. Step S52: Determine a first adjustment amount based on the product of the fineness deviation value and the fineness adjustment coefficient, and determine a second adjustment amount based on the product of the dispersion stability deviation value and the dispersion stability adjustment coefficient, wherein the fineness adjustment coefficient is 0.2 and the dispersion stability adjustment coefficient is 0.3; Step S53: Determine the total adjustment amount of the biological antifungal and antibacterial agent based on the sum of the first adjustment amount and the second adjustment amount; Step S54: Determine the total amount of biological antifungal and antibacterial agent added based on the sum of the total adjustment amount of the biological antifungal and antibacterial agent and the preset amount of biological antifungal and antibacterial agent added.

[0012] Furthermore, in step S5, the addition rate is increased based on the ratio of the preset amount of biological antifungal and antibacterial agent added to the total amount of biological antifungal and antibacterial agent added; The increase in the addition rate is the product of the ratio and the preset addition rate, whereby the preset addition rate is 5% of the total addition amount per minute.

[0013] Furthermore, in steps S3 and S4, at least three samples are taken from different spatial locations, mixed, and then tested.

[0014] On the other hand, the present invention provides a formulation for an anti-mildew coating under high temperature and high humidity conditions, wherein the preset mass ratio of each component is: 60 parts of fluorocarbon resin, 0.5 to 1 part of surfactant, 0.5 to 1 part of leveling agent, 0.5 to 1 part of defoamer, 0.5 to 1 part of dispersant, 1 to 2 parts of biological anti-mildew and antibacterial agent, 10 parts of pigment, 20 to 25 parts of titanium dioxide filler, 5 to 10 parts of toluene, and 0.5 to 1 part of thixotropic agent; The mixed additives are a mixture of toluene, surfactants, leveling agents, defoamers, dispersants, and thixotropic agents.

[0015] Compared with existing technologies, the beneficial effects of this invention are that it introduces biological anti-mold technology. Traditional anti-mold coatings add chemical anti-mold agents to the coating, which initially have a certain degree of anti-mold properties, but these properties decrease or even disappear over time, and cause excessive harm to the production environment. In contrast, this invention adds a biological anti-mold agent, which continuously grows from the coating to the surface, forming an inhibition layer of 300-400 micrometers on the coating surface. Molds that enter the inhibition layer lose their ability to reproduce, and the active period of the biological anti-mold agent can last for decades.

[0016] Furthermore, this invention kills bacteria or fungi by inactivating various metabolic enzymes within bacterial or fungal cells and reacting chemically with intracellular proteins, thereby disrupting the intracellular energy release system, hindering the electron transfer system and the generation of amino acid transesterification.

[0017] Furthermore, this invention generates active oxygen on the surface of inorganic antibacterial and antifungal agents through photocatalysis, thereby decomposing microorganisms and the organic nutrients they depend on for survival, thus inhibiting spore formation and bacterial growth, disrupting the normal cell growth system, and achieving the purpose of inhibiting microbial reproduction.

[0018] Furthermore, the oil-based paint is applied onto the water-based putty to form a stable paint system. The putty, as the most critical and weakest link in this system, should be weaker than the substrate but stronger than the paint. However, the resin paint itself has high strength, and stress is generated during the curing process. If the putty is not strong enough, cracking will occur. This invention reduces the stress generated during the curing process of the paint while ensuring its strength and hardness, and at the same time ensures that the paint has a certain degree of elasticity to adapt to the thermal expansion and contraction of the substrate caused by changes in workshop temperature.

[0019] Furthermore, by adding titanium dioxide filler, the coating surface forms a glaze rather than a paint surface, which greatly increases its self-cleaning and impermeability properties. It is stain-resistant, oil-resistant, water-resistant, easy to clean, and mold is not easy to adhere to, thus playing an auxiliary role in mold prevention.

[0020] Furthermore, this invention uses a special resin as a base material, which forms a dense coating after coating, sealing off the connection between the wall and the outside world, cutting off the nutrients and moisture necessary for the growth and reproduction of mold, making it impossible for mold to enter the wall, and even if it does enter, it is difficult for it to reproduce and grow. Attached Figure Description

[0021] Figure 1 This is a flowchart illustrating the preparation method of the anti-mildew coating under high temperature and high humidity conditions according to an embodiment of the present invention. Figure 2 This is a flowchart of step S1 of the method for preparing anti-mildew coating under high temperature and high humidity conditions according to an embodiment of the present invention; Figure 3 This is a flowchart of step S4 of the method for preparing anti-mildew coating under high temperature and high humidity conditions according to an embodiment of the present invention; Figure 4 This is a flowchart of step S5 of the method for preparing anti-mildew coating under high temperature and high humidity conditions according to an embodiment of the present invention. Detailed Implementation

[0022] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0023] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0024] Please see Figure 1 The figures shown are flowcharts of the preparation method of anti-mildew coating under high temperature and high humidity environment according to embodiments of the present invention. The method for preparing anti-mildew coating under high temperature and high humidity conditions according to embodiments of the present invention includes: Step S1: Fluorocarbon resin, pigment and titanium dioxide filler are put into a mixer and stirred and mixed. A viscosity curve is obtained based on the first viscosity during the mixing process to dynamically adjust the stirring rate and obtain the first mixture. Step S2: Determine the amount of mixing aid to be added based on the viscosity difference value obtained between the second viscosity and the preset viscosity of the first mixture, so as to add the mixing aid to the first mixture and continue stirring for a preset time to obtain the second mixture; Step S3: Determine whether the dispersion of the mixture meets the standard based on the fineness of the largest particle agglomerate in the second mixture, and supplement the mixing aid according to the difference between the test result and the preset standard fineness based on the result that the dispersion of the mixture does not meet the standard. Step S4: Determine the dispersion stability characteristic value of the second mixture based on the volume of the sedimentation layer of the second mixture in the centrifugal sedimentation experiment, and determine the filtration pressure according to the dispersion stability characteristic value to remove impurities and obtain a uniform slurry. Step S5: Determine the total amount of biological antifungal and antibacterial agent to be added to the uniform slurry based on the difference between the dispersion stability characteristic value of the uniform slurry and the preset characteristic threshold. Step S6: Package the uniform slurry to obtain the finished anti-mildew coating.

[0025] Please see Figure 2 The diagram shown is a flowchart of step S1 of the method for preparing anti-mildew coating under high temperature and high humidity conditions according to an embodiment of the present invention. In step S1, the process of dynamically adjusting the stirring rate includes: Step S11: The fluorocarbon resin, the pigment, and the titanium dioxide filler are placed into a mixer in a preset mass ratio of 12:2:5 and stirred at a stirring speed of 100 rpm. Step S12: Based on the real-time acquired first viscosity, obtain the viscosity curve that changes over time to obtain the viscosity change amplitude value of the first viscosity within a preset unit time. Step S13: Compare and analyze the viscosity change range with a preset change range threshold, where the preset change range threshold is 1%. Step S14: Based on the result that the mixing time exceeds 30 minutes and the viscosity change value is greater than the preset change value, indicating that the raw materials are not mixed evenly, it is determined to increase the stirring speed by 20 rpm.

[0026] Specifically, in step S2, the process of determining the amount of the mixing additive includes: Step S21: The ratio of the difference between the preset viscosity and the second viscosity to the preset viscosity is determined as the viscosity difference value, where the preset viscosity is 287.0 mm² / s; Step S22: Compare and analyze the viscosity difference value with a preset viscosity difference threshold, wherein the preset viscosity difference threshold is 0.09; Step S23: Based on the result that the viscosity difference value is greater than or equal to the preset viscosity difference threshold, determine to adjust and increase the amount of the mixing additive, or based on the result that the viscosity difference value is less than the preset viscosity difference threshold, determine to adjust and decrease the amount of the mixing additive. The second viscosity is characterized by the result obtained by the first mixture at 25°C; The magnitude of the increase / decrease in the amount of the mixed additive is positively correlated with the viscosity difference value. The adjustment value is the product of the viscosity difference value, an empirical adjustment coefficient for the mixed additive, and a preset amount of the mixed additive. The adjustment value for the mixed additive is calculated as follows: m = k1 × m0 × g; Wherein, m is the amount of the mixed additive added, k1 is the empirical adjustment coefficient of the mixed additive, preferably 0.2, g is the viscosity difference value, and m0 is the preset amount of mixed additive added.

[0027] Specifically, in step S3, the process of determining whether the dispersion of the mixture meets the standard includes: Step S31: The ratio of the difference between the maximum fineness and the preset standard fineness to the preset standard fineness is determined as the fineness difference value, where the preset standard fineness is 5 μm; Step S32: Compare and analyze the fineness difference value with a preset fineness difference threshold, wherein the preset fineness difference threshold is 0.13; Step S33: Based on the result that the fineness difference value is greater than or equal to the preset fineness threshold, determine to adjust and increase the amount of thixotropic agent added, or based on the result that the fineness difference value is less than the preset fineness threshold, determine that the dispersion uniformity meets the standard. The maximum fineness is characterized by the maximum fineness of the particles in the second mixture as detected by a scraper fineness meter; The magnitude of the increase in the amount of thixotropic agent added is positively correlated with the fineness difference value. The adjustment value is the product of the fineness difference value, the empirical adjustment coefficient of the thixotropic agent, and the amount of the preset mixed additive. The method for calculating the increase in the amount of thixotropic agent is as follows: a = k2 × m1 × f; Where a is the amount of thixotropic agent added, k2 is the empirical adjustment coefficient of thixotropic agent, f is the fineness difference value, and m1 is the preset amount of thixotropic agent added.

[0028] It is understandable that using a scraper fineness gauge to detect fineness is existing technology, and the detection method will not be described in detail here.

[0029] Please see Figure 3 The diagram shows a flowchart of step S4 in the preparation method of the anti-mildew coating under high temperature and high humidity conditions according to an embodiment of the present invention. In step S4, the dispersion stability characteristic value of the second mixture is determined, including: Step S41: Take 30 mL of the mixture to be tested and inject it into a centrifuge tube; Step S42: Centrifuge at 3000 rpm for 5 min and let stand for 1 min; Step S43, the ratio of the volume of the sedimentation layer at the bottom of the centrifuge tube to the initial total volume of the mixture is the dispersion stability characteristic value.

[0030] Specifically, in step S4, the process of determining the filtration pressure based on the dispersion stability characteristic value includes: Step S44: Compare and analyze the dispersion stability feature value with the preset stability threshold. Step S45: Based on the result that the dispersion stability characteristic value is less than the preset stability threshold, it is determined to filter at a preset base pressure of 0.1 MPa; based on the result that the dispersion stability characteristic value is greater than or equal to the preset stability threshold, it is determined to adjust and increase the pressure before filtering. The magnitude of the pressure increase is positively correlated with the difference between the dispersion stability characteristic value and the preset stability threshold. The adjustment value is the difference between the dispersion stability characteristic value and the preset stability threshold and the preset base pressure of 0.1 MPa.

[0031] The increase in the preset pressure is positively correlated with the difference between the dispersion stability characteristic value and the preset stability threshold. The method for calculating the pressure increase is as follows: P = (R - R0) × P0; Where P is the pressure increase value, R is the dispersion stability characteristic value, R0 is the preset stability threshold, and P0 is the preset pressure.

[0032] Please see Figure 4 The diagram shows a flowchart of step S5 in the preparation method of the anti-mildew coating under high temperature and high humidity conditions according to an embodiment of the present invention. In step S5, the process of determining the total amount of biological anti-mildew and antibacterial agent includes: Step S51: Determine the fineness deviation value based on the difference between the maximum fineness and the preset standard fineness, and determine the dispersion stability deviation value based on the difference between the dispersion stability characteristic value and the preset stability threshold. Step S52: Determine a first adjustment amount based on the product of the fineness deviation value and the fineness adjustment coefficient, and determine a second adjustment amount based on the product of the dispersion stability deviation value and the dispersion stability adjustment coefficient, wherein the fineness adjustment coefficient is 0.2 and the dispersion stability adjustment coefficient is 0.3; Step S53: Determine the total adjustment amount of the biological antifungal and antibacterial agent based on the sum of the first adjustment amount and the second adjustment amount; Step S54: Determine the total amount of biological antifungal and antibacterial agent added based on the sum of the total adjustment amount of the biological antifungal and antibacterial agent and the preset amount of biological antifungal and antibacterial agent added.

[0033] Specifically, in step S5, the addition rate is increased according to the ratio of the preset amount of biological antifungal and antibacterial agent added to the total amount of biological antifungal and antibacterial agent added. Wherein, the increase in the addition rate is the product of the ratio and the preset addition rate, and the method for calculating the increase in the addition rate is as follows: V = (M / M0) × V0; Wherein, V is the increase in the addition rate, M is the total amount of biological antifungal and antibacterial agent added, M0 is the total amount of biological antifungal and antibacterial agent added, and V0 is the preset addition rate. Preferably, the preset addition rate is 5% of the total amount added per minute.

[0034] Specifically, in steps S3 and S4, at least three samples are taken from different spatial locations, mixed, and then tested.

[0035] Specifically, the preset mass ratio of each component is as follows: 60 parts fluorocarbon resin, 0.5 to 1 part surfactant, 0.5 to 1 part leveling agent, 0.5 to 1 part defoamer, 1% dispersant, 1 to 2 parts biological antifungal and antibacterial agent, 10 parts pigment, 20 to 25 parts titanium dioxide filler, 5 to 10 parts toluene, and 0.5 to 1 part thixotropic agent; The mixed additives are a mixture of toluene, surfactants, leveling agents, defoamers, dispersants, and thixotropic agents.

[0036] Example 1: Step S1, fluorocarbon resin, pigment and titanium dioxide filler are put into a mixer according to a preset mass ratio and stirred at an initial stirring rate of 100 rpm; the first viscosity during the mixing process is monitored in real time using a viscometer, and the viscosity-time curve is plotted to dynamically adjust the stirring rate to obtain the first mixture.

[0037] Step S2: Measure the second viscosity of the first mixture. Determine the amount of mixing additive to be added based on the viscosity difference value obtained between the second viscosity of the first mixture and the preset viscosity. The mixing additive consists of: 8 parts toluene, 1 part surfactant, 3 parts leveling agent, 1 part defoamer, 1 part dispersant, and 1 part thixotropic agent.

[0038] Step S3: Take 30 mL of the second mixture and use a scraper fineness meter to check the maximum fineness. The preset standard fineness is 5 μm. This is the preset thixotropic agent addition amount. When sampling, take 10 mL samples from each of the top, middle, and bottom positions of the mixing vessel, mix them, and then test them to ensure representativeness.

[0039] Step S4: Perform a centrifugal sedimentation experiment. Take 30 mL of the mixture and centrifuge at 3000 rpm for 5 min. After standing for 1 min, calculate the ratio of the sedimentation layer volume to the initial volume as the dispersion stability characteristic value.

[0040] Step S5: Determine the total amount of biological antifungal and antibacterial agent to be added based on the dispersion deviation and dispersion stability deviation of the uniform slurry.

[0041] Step S6: After vacuum degassing the uniform slurry, package it to obtain the finished anti-mildew coating.

[0042] The raw material ratio is as follows: 60 kg of fluorocarbon resin, 1.5 kg of biological antifungal and antibacterial agent, 10 kg of pigment, 23 kg of titanium dioxide filler, and 13 kg of mixed additives. The mass ratio of the mixed additives is: 8 parts toluene, 0.75 parts surfactant, 0.75 parts leveling agent, 0.75 parts defoamer, 0.75 parts dispersant, and 0.75 parts thixotropic agent.

[0043] The anti-mildew performance of the product in Example 1 was tested, and the results are shown in the table below: Table 1. Results of mold prevention test of coating in Example 1

[0044] Among them, the selected bacteria for testing were all fungi. A Di / Dc > 1.5 indicates a strong antibacterial effect, while a Di / Dc < 1.5 indicates a moderate antibacterial effect. It can be seen that the antifungal coating in this embodiment has a strong inhibitory effect on fungi.

[0045] Example 2: In this example, the raw material ratio is: 60 kg of fluorocarbon resin, 1 kg of biological antifungal and antibacterial agent, 10 kg of pigment, 20 kg of titanium dioxide filler, and 10 kg of mixing additives. The mass ratio of the mixed additives is: 5 parts toluene, 0.5 parts surfactant, 0.5 parts leveling agent, 0.5 parts defoamer, 0.5 parts dispersant, and 0.5 parts thixotropic agent; the preparation method is the same as in Example 1.

[0046] Example 3: In this example, the raw material ratio is: 60 kg of fluorocarbon resin, 2 kg of biological antifungal and antibacterial agent, 10 kg of pigment, 25 kg of titanium dioxide filler, and 15 kg of mixed additives. The mass ratio of the mixed additives is: 10 parts toluene, 1 part surfactant, 1 part leveling agent, 1 part defoamer, 1 part dispersant, and 1 part thixotropic agent; the preparation method is the same as in Example 1.

[0047] The performance of the products from Examples 1-3 was tested, and the results are shown in the table below: Table 2 Performance test results of products in Examples 1-3

[0048] As can be seen, by changing the dosage of various key additives in Examples 2 and 3, but through a real-time monitoring and feedback mechanism of multiple dimensions such as viscosity, fineness, and dispersion stability, the present invention can adaptively adjust the process for different initial formulations to ensure that the performance of the final product remains stable within the predetermined high-quality range.

[0049] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing an anti-mildew coating for high temperature and high humidity environments, characterized in that, include: Step S1: Fluorocarbon resin, pigment and titanium dioxide filler are put into a mixer and stirred and mixed. A viscosity curve is obtained based on the first viscosity during the mixing process to dynamically adjust the stirring rate and obtain the first mixture. Step S2: Determine the amount of mixing aid to be added based on the viscosity difference value obtained between the second viscosity and the preset viscosity of the first mixture, so as to add the mixing aid to the first mixture, and continue stirring for a preset time to obtain the second mixture; Step S3: Determine whether the dispersion of the mixture meets the standard based on the fineness of the largest particle agglomerate in the second mixture, and supplement the mixing aid according to the difference between the test result and the preset standard fineness based on the result that the dispersion of the mixture does not meet the standard. Step S4: Determine the dispersion stability characteristic value of the second mixture based on the volume of the sedimentation layer of the second mixture in the centrifugal sedimentation experiment, and determine the filtration pressure according to the dispersion stability characteristic value to remove impurities and obtain a uniform slurry. Step S5: Determine the total amount of biological antifungal and antibacterial agent to be added to the uniform slurry based on the difference between the dispersion stability characteristic value of the uniform slurry and the preset characteristic threshold. Step S6: Package the uniform slurry to obtain the finished anti-mildew coating.

2. The method for preparing the anti-mildew coating under high temperature and high humidity conditions according to claim 1, characterized in that, In step S1, the process of dynamically adjusting the stirring rate includes: Step S11: The fluorocarbon resin, the pigment, and the titanium dioxide filler are placed into a mixer in a preset mass ratio of 12:2:5 and stirred at a stirring speed of 100 rpm. Step S12: Based on the real-time acquired first viscosity, obtain the viscosity curve that changes over time to obtain the viscosity change amplitude value of the first viscosity within a preset unit time. Step S13: Compare and analyze the viscosity change range with a preset change range threshold, where the preset change range threshold is 1%. Step S14: Based on the result that the mixing time exceeds 30 minutes and the viscosity change value is greater than the preset change value, indicating that the raw materials are not mixed evenly, it is determined to increase the stirring speed by 20 rpm.

3. The method for preparing anti-mildew coating under high temperature and high humidity conditions according to claim 2, characterized in that, In step S2, the process of determining the amount of the mixing additive includes: Step S21: The ratio of the difference between the preset viscosity and the second viscosity to the preset viscosity is determined as the viscosity difference value, where the preset viscosity is 287.0 mm² / s; Step S22: Compare and analyze the viscosity difference value with a preset viscosity difference threshold, wherein the preset viscosity difference threshold is 0.09; Step S23: Based on the result that the viscosity difference value is greater than or equal to the preset viscosity difference threshold, determine to adjust and increase the amount of the mixing additive, or based on the result that the viscosity difference value is less than the preset viscosity difference threshold, determine to adjust and decrease the amount of the mixing additive. The second viscosity is characterized by the result obtained by the first mixture at 25°C; The magnitude of the increase / decrease in the amount of the mixed additive is positively correlated with the viscosity difference value. The adjustment value is the product of the viscosity difference value, the adjustment coefficient of the mixed additive, and the preset amount of the mixed additive.

4. The method for preparing the anti-mildew coating under high temperature and high humidity conditions according to claim 3, characterized in that, In step S3, the process of determining whether the dispersion of the mixture meets the standard includes: Step S31: The ratio of the difference between the maximum fineness and the preset standard fineness to the preset standard fineness is determined as the fineness difference value, where the preset standard fineness is 5 μm; Step S32: Compare and analyze the fineness difference value with a preset fineness difference threshold, wherein the preset fineness difference threshold is 0.13; Step S33: Based on the result that the fineness difference value is greater than or equal to the preset fineness threshold, determine to adjust and increase the amount of thixotropic agent added, or based on the result that the fineness difference value is less than the preset fineness threshold, determine that the dispersion uniformity meets the standard. The maximum fineness is characterized by the maximum fineness of the particles in the second mixture as detected by a scraper fineness meter; The magnitude of the increase in the amount of thixotropic agent added is positively correlated with the fineness difference value. The adjustment value is the product of the fineness difference value, the empirical adjustment coefficient of the thixotropic agent, and the amount of the preset mixed additive.

5. The method for preparing the anti-mildew coating under high temperature and high humidity conditions according to claim 4, characterized in that, In step S4, determining the dispersion stability characteristic value of the second mixture includes: Step S41: Take 30 mL of the mixture to be tested and inject it into a centrifuge tube; Step S42: Centrifuge at 3000 rpm for 5 min and let stand for 1 min; Step S43: Determine the dispersion stability characteristic value based on the ratio of the volume of the sedimentation layer at the bottom of the centrifuge tube to the initial total volume of the mixture.

6. The method for preparing the anti-mildew coating under high temperature and high humidity conditions according to claim 5, characterized in that, In step S4, the process of determining the filtration pressure based on the dispersion stability characteristic value includes: Step S44: Compare and analyze the dispersion stability feature value with a preset stability threshold, wherein the preset stability threshold is 0.2; Step S45: Based on the result that the dispersion stability characteristic value is less than the preset stability threshold, it is determined to filter at a preset base pressure of 0.1 MPa; based on the result that the dispersion stability characteristic value is greater than or equal to the preset stability threshold, it is determined to adjust and increase the pressure before filtering. The magnitude of the increased pressure is positively correlated with the difference between the dispersion stability characteristic value and the preset stability threshold. The adjustment value is the product of the difference between the dispersion stability characteristic value and the preset stability threshold and the preset base pressure.

7. The method for preparing the anti-mildew coating under high temperature and high humidity conditions according to claim 6, characterized in that, In step S5, the process of determining the total amount of biological antifungal and antibacterial agent added includes: Step S51: Determine the fineness deviation value based on the difference between the maximum fineness and the preset standard fineness, and determine the dispersion stability deviation value based on the difference between the dispersion stability characteristic value and the preset stability threshold. Step S52: Determine a first adjustment amount based on the product of the fineness deviation value and the fineness adjustment coefficient, and determine a second adjustment amount based on the product of the dispersion stability deviation value and the dispersion stability adjustment coefficient, wherein the fineness adjustment coefficient is 0.2 and the dispersion stability adjustment coefficient is 0.3; Step S53: Determine the total adjustment amount of the biological antifungal and antibacterial agent based on the sum of the first adjustment amount and the second adjustment amount; Step S54: Determine the total amount of biological antifungal and antibacterial agent added based on the sum of the total adjustment amount of the biological antifungal and antibacterial agent and the preset amount of biological antifungal and antibacterial agent added.

8. The method for preparing the anti-mildew coating under high temperature and high humidity conditions according to claim 7, characterized in that, In step S5, the addition rate is increased based on the ratio of the preset amount of biological antifungal and antibacterial agent added to the total amount of biological antifungal and antibacterial agent added. The increase in the addition rate is the product of the ratio and the preset addition rate, whereby the preset addition rate is 5% of the total addition amount per minute.

9. The method for preparing the anti-mildew coating under high temperature and high humidity conditions according to claim 8, characterized in that, In steps S3 and S4, at least three samples are taken from different spatial locations, mixed, and then tested.

10. A formulation for a high-temperature and high-humidity anti-mildew coating prepared by the preparation method according to any one of claims 1-9, characterized in that, The preset mass ratio of each component is as follows: 60 parts of fluorocarbon resin, 1 to 2 parts of biological antifungal and antibacterial agent, 10 parts of pigment, 20 to 25 parts of titanium dioxide filler, and 10 to 15 parts of mixed additives. The mixed additives include 5 to 10 parts toluene, 0.5 to 1 part surfactant, 0.5 to 1 part leveling agent, 0.5 to 1 part defoamer, 0.5 to 1 part dispersant, and 0.5 to 1 part thixotropic agent.

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