Weather-resistant ethylene-propylene-diene monomer coating and preparation method thereof

Abstract

The invention discloses a weather-resistant ethylene-propylene-diene monomer coating which is prepared from the following components in parts by weight: 35 to 40 parts of fluororubber, 10 to 20 parts of polytetrafluoroethylene powder, 20 to 25 parts of organic silicon resin, 80 to 100 parts of polyurethane resin, 3 to 5 parts of nano-silver particles, 15 to 18 parts of mica powder, 1.3 to 2 parts of ultramicro silicon carbide and 10 to 12 parts of modified weather-resistant filler. The invention relates to the technical field of coatings, in particular to an anti-cracking coating. The anti-cracking coating comprises, by weight, 30-35 parts of organic solvent, 0.066-1 part of initiator, 20-22 parts of curing agent, 0.4-1 part of thickening agent, 1.7-2.4 parts of pigment, 0.65-1.2 parts of dispersing agent and 8-10 parts of anti-cracking agent. The uniformly dispersed filler reduces the stress concentration in the coating and improves the flexibility and impact resistance of the coating, so that the coating is not easy to crack and peel under different environmental conditions. And in the aspect of glossiness, the filler is uniformly distributed, so that light reflection is more uniform, the surface gloss of the coating is more attractive and softer, and higher decorative requirements are met.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a weather-resistant EPDM coating and a preparation method thereof. Background Art

[0002] With the continuous development of modern industry and construction, the performance requirements for coatings are increasing. In outdoor environments, coatings need to have excellent weather resistance to resist the influence of ultraviolet radiation, acid rain erosion, temperature changes and other factors. At the same time, for some special uses, such as chemical equipment corrosion protection and marine facility protection, coatings must not only be weather-resistant, but also have good chemical stability, mechanical strength and antibacterial properties. This growing demand for high performance has prompted coating research and development to develop in a diversified and refined direction.

[0003] Traditional coating preparation technology makes it difficult to ensure uniform distribution of each component in the entire system. From the order and speed of adding raw materials to the stirring and mixing process, if each link lacks precise control, it is easy to cause local component concentration differences. For example, in some multi-component coatings, the compatibility and dispersibility between different resins, fillers and additives vary greatly. Traditional preparation processes are difficult to fully mix and evenly affect the overall performance and service life of the coating. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a weather-resistant EPDM coating, which comprises the following components by weight: 35-40 parts by weight of fluororubber, 10-20 parts by weight of polytetrafluoroethylene powder, 20-25 parts by weight of silicone resin, 80-100 parts by weight of polyurethane resin, 3-5 parts by weight of nano silver particles, 15-18 parts by weight of mica powder, 1.3-2 parts by weight of ultrafine silicon carbide, 10-12 parts by weight of modified weather-resistant filler, 30-35 parts by weight of organic solvent, 0.066-1 parts by weight of initiator, 20-22 parts by weight of curing agent, 0.4-1 parts by weight of thickener, 1.7-2.4 parts by weight of pigment, 0.65-1.2 parts by weight of dispersant and 8-10 parts by weight of anti-cracking agent.

[0005] Preferably, the modified weather-resistant filler comprises the following components by weight: 15-20 parts by weight of nano-silicon dioxide, 8-12 parts by weight of nano-cerium oxide, 3-5 parts by weight of bis-[γ-(triethoxysilyl)propyl]tetrasulfide, 2-4 parts by weight of diethylenetriaminepenta(methylenephosphonic acid), 5-8 parts by weight of microcrystalline cellulose, 1-2 parts by weight of aluminum chloride, 25-35 parts by weight of 1-methyl-2-pyrrolidone, 5-7 parts by weight of graphene oxide, 2-4 parts by weight of 3-aminopropyltrimethoxysilane, 1-2 parts by weight of dicyclohexylcarbodiimide, and 20-30 parts by weight of toluene.

[0006] Preferably, the organic solvent is a mixture of ethyl acetate and propylene glycol methyl ether acetate, wherein the ratio of ethyl acetate to propylene glycol methyl ether acetate is 1:1;

[0007] The initiator is methyl ethyl ketone peroxide, the curing agent is isophorone diamine, the thickener is hydroxyethyl cellulose, and the dispersant is polyacrylate ammonium salt.

[0008] Preferably, the anti-cracking agent comprises the following components by weight: 25 parts by weight of terminal hydroxyl polybutadiene, 20 parts by weight of epoxy resin E-51, 8 parts by weight of nano-silicon dioxide, 5 parts by weight of dimethyl silicone oil, 3 parts by weight of benzotriazole, and 1 part by weight of dibutyltin dilaurate.

[0009] A method for preparing a weather-resistant EPDM coating comprises the following steps:

[0010] Step A1: Premixing: pour the organic solvent (ethyl acetate and propylene glycol methyl ether acetate mixed in a ratio of 1:1) into a stirring container;

[0011] Add fluororubber, polytetrafluoroethylene powder, silicone resin and polyurethane resin in sequence, stir evenly with a stirrer for 40 minutes at a stirring speed of 600 rpm and the temperature is controlled at 25°C;

[0012] Step A2: adding functional fillers, slowly adding nano silver particles, mica powder, ultrafine silicon carbide, and modified weather-resistant fillers into the premixed solution;

[0013] Use a control system to control a high-speed disperser for dispersion, with a dispersion time of 70 minutes, a dispersion speed of 1800 rpm, and a temperature of 30°C;

[0014] Step A3: Refining treatment: the dispersed coating is transferred to a sand mill for refining treatment. The sand milling time is 2.5 hours, the sand mill speed is 2200 rpm, and the temperature is controlled at 35°C.

[0015] Step A4: Adding additives, adding initiator methyl ethyl ketone peroxide, curing agent isophorone diamine, thickener hydroxyethyl cellulose, pigment, dispersant polyacrylate ammonium salt, and anti-cracking agent to the sand-milled coating in sequence;

[0016] Stir evenly with a stirrer for 50 minutes at a stirring speed of 900 rpm and a temperature of 30°C;

[0017] Step A5: Adjust the pH value and filter. Use a pH meter to measure the pH value of the coating and keep it at around 7.5. If it is not within this range, add an appropriate amount of acid-base regulator to adjust it.

[0018] Step A6: Filter the prepared coating through a filter to remove impurities and obtain a finished coating.

[0019] Preferably, the method for preparing the modified weather-resistant filler comprises the following steps:

[0020] Step B1: Add nano-silicon dioxide, nano-cerium oxide and graphene oxide to a reaction vessel containing 1-methyl-2-pyrrolidone, turn on the stirrer, and stir at a medium speed (stirring speed is about 150-200 rpm) for 30 minutes to evenly disperse the nanoparticles in the solvent;

[0021] Step B2: Slowly add bis-[γ-(triethoxysilyl)propyl]tetrasulfide and 3-aminopropyltrimethoxysilane and continue stirring for 2 hours;

[0022] Step B3: Add aluminum chloride and stir for 1 hour;

[0023] Step B4: Add dicyclohexylcarbodiimide to a container containing toluene, stir to dissolve, then slowly add to the above reaction system, and continue stirring for 3 hours;

[0024] Step B5: filtering the reaction mixture and washing it with toluene three times to remove unreacted substances and impurities;

[0025] Step B6: Drying at 80-100° C. for 4-6 hours to obtain a modified weather-resistant filler.

[0026] Preferably, the method for preparing the anti-cracking agent comprises the following steps:

[0027] Step C1: Equipment preparation: a reactor with a stirrer and a thermometer;

[0028] Step C2: Operation steps: Add hydroxy-terminated polybutadiene and epoxy resin E-51 into the reaction kettle, turn on the stirrer, and heat to 70°C;

[0029] Step C3: Slowly add nano-silica and continue stirring for 1 hour;

[0030] Step C4: Add dimethyl silicone oil and benzotriazole, and stir for 30 minutes;

[0031] Step C5: Finally, add dibutyltin dilaurate and stir for 20 minutes to obtain an anti-cracking agent.

[0032] Preferably, the control method of the control system in step A2 comprises the following steps:

[0033] Step 1: Install a temperature sensor and intelligent temperature control system in the high-speed disperser. The temperature sensor can accurately monitor the temperature changes at every location in the high-speed disperser in real time.

[0034] The intelligent temperature control system has powerful data analysis and automatic adjustment capabilities. When it detects that the temperature deviates from the set range, it can quickly and accurately adjust the heating or cooling power;

[0035] Step 2: Install a torque sensor on the rotating shaft of the high-speed disperser. The torque sensor can flexibly adjust the speed of the stirring motor according to changes in the mixing process;

[0036] Step 3: Introduce advanced online monitoring technology and install a dispersion monitor, which can monitor the viscosity changes of materials in real time and accurately;

[0037] Step 4: The temperature range of the high-speed disperser is strictly set to 30°C. Through a large number of experiments and data analysis, it is determined that within this temperature range, the material can maintain the best fluidity and mixing performance;

[0038] Step 5: Set the dispersion threshold and determine the dispersion range through precise experiments and data analysis according to different mixing stages and material combinations;

[0039] Step 6: According to the above technical solution, the material is dispersed by real-time regulation through the deployment system.

[0040] The invention discloses a weather-resistant EPDM coating and a preparation method thereof, which has the following beneficial effects:

[0041] 1. The nano-silica in the modified weather-resistant filler of the present application has excellent ultraviolet absorption and scattering capabilities, which can significantly improve the weather resistance of the coating. Bis-[γ-(triethoxysilyl)propyl]tetrasulfide helps to improve the bonding with the coating system and enhance the corrosion resistance. Diethylenetriaminepenta(methylenephosphonic acid) has a good chelating effect and can improve the corrosion resistance. 1-Methyl-2-pyrrolidone replaces N-methylpyrrolidone and improves the solubility and stability to a certain extent. 3-Aminopropyltrimethoxysilane is combined with other ingredients to improve the bonding and anti-cracking performance.

[0042] 2. The anti-cracking agent of the present application provides good flexibility and bonding strength through terminal hydroxyl polybutadiene and epoxy resin, nano-silicon dioxide enhances strength, dimethyl silicone oil improves anti-cracking performance, benzotriazole provides a certain corrosion resistance, and dibutyltin dilaurate is used as a catalyst to promote the reaction. The overall formula is relatively simple, and the focus is on anti-cracking and corrosion resistance.

[0043] 3. By precisely controlling the time, temperature and dispersion speed of filler addition, the internal microstructure of the coating is significantly optimized. The filler is evenly and stably distributed in the coating system, reducing agglomeration. Taking nanosilver particles as an example, after uniform dispersion, they can form a denser and more effective antibacterial network in the coating, enhancing the durability and broad spectrum of antibacterial properties. The orderly dispersion of flaky fillers such as mica powder can improve the barrier properties of the coating, block the intrusion of moisture, oxygen and corrosive media, and enhance the protective function of the coating at the microscopic level.

[0044] 4. Evenly dispersed fillers reduce stress concentration inside the coating, improve the flexibility and impact resistance of the coating, and make it less likely to crack or peel off under different environmental conditions. In terms of gloss, evenly distributed fillers make light reflection more even, and the gloss of the coating surface is more beautiful and soft, meeting higher decorative requirements. DETAILED DESCRIPTION

[0045] The following specific embodiments further describe the present invention in detail. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0046] Example 1, a weather-resistant EPDM coating, comprising the following components by weight: 38 parts by weight of fluororubber, 15 parts by weight of polytetrafluoroethylene powder, 23 parts by weight of silicone resin, 90 parts by weight of polyurethane resin, 4 parts by weight of nano silver particles, 16 parts by weight of mica powder, 1.5 parts by weight of ultrafine silicon carbide, 11 parts by weight of modified weather-resistant filler, 32 parts by weight of organic solvent, 0.8 parts by weight of initiator, 21 parts by weight of curing agent, 0.8 parts by weight of thickener, 2 parts by weight of pigment, 1 part by weight of dispersant, and 9 parts by weight of anti-cracking agent.

[0047] The organic solvent is a mixture of ethyl acetate and propylene glycol methyl ether acetate, wherein the ratio of ethyl acetate to propylene glycol methyl ether acetate is 1:1;

[0048] The initiator is methyl ethyl ketone peroxide, the curing agent is isophorone diamine, the thickener is hydroxyethyl cellulose, and the dispersant is polyacrylate ammonium salt.

[0049] The anti-cracking agent includes the following weight components: 25 weight parts of terminal hydroxyl polybutadiene, 20 weight parts of epoxy resin E-51, 8 weight parts of nano silicon dioxide, 5 weight parts of dimethyl silicone oil, 3 weight parts of benzotriazole, and 1 weight part of dibutyltin dilaurate.

[0050] The modified weather-resistant filler includes the following components by weight: 15 parts by weight of nano-silicon dioxide, 8 parts by weight of nano-cerium oxide, 3 parts by weight of bis-[γ-(triethoxysilyl)propyl]tetrasulfide, 2 parts by weight of diethylenetriaminepenta(methylenephosphonic acid), 5 parts by weight of microcrystalline cellulose, 1 part by weight of aluminum trichloride, 25 parts by weight of 1-methyl-2-pyrrolidone, 5 parts by weight of graphene oxide, 2 parts by weight of 3-aminopropyltrimethoxysilane, 1 part by weight of dicyclohexylcarbodiimide, and 20 parts by weight of toluene.

[0051] Example 2, a weather-resistant EPDM coating, comprising the following components by weight: 38 parts by weight of fluororubber, 15 parts by weight of polytetrafluoroethylene powder, 23 parts by weight of silicone resin, 90 parts by weight of polyurethane resin, 4 parts by weight of nano silver particles, 16 parts by weight of mica powder, 1.5 parts by weight of ultrafine silicon carbide, 11 parts by weight of modified weather-resistant filler, 32 parts by weight of organic solvent, 0.8 parts by weight of initiator, 21 parts by weight of curing agent, 0.8 parts by weight of thickener, 2 parts by weight of pigment, 1 part by weight of dispersant, and 9 parts by weight of anti-cracking agent.

[0052] The organic solvent is a mixture of ethyl acetate and propylene glycol methyl ether acetate, wherein the ratio of ethyl acetate to propylene glycol methyl ether acetate is 1:1;

[0053] The initiator is methyl ethyl ketone peroxide, the curing agent is isophorone diamine, the thickener is hydroxyethyl cellulose, and the dispersant is polyacrylate ammonium salt.

[0054] The anti-cracking agent includes the following weight components: 25 weight parts of terminal hydroxyl polybutadiene, 20 weight parts of epoxy resin E-51, 8 weight parts of nano silicon dioxide, 5 weight parts of dimethyl silicone oil, 3 weight parts of benzotriazole, and 1 weight part of dibutyltin dilaurate.

[0055] The modified weather-resistant filler includes the following components by weight: 17.5 parts by weight of nano-silicon dioxide, 10 parts by weight of nano-cerium oxide, 4 parts by weight of bis-[γ-(triethoxysilyl)propyl]tetrasulfide, 3 parts by weight of diethylenetriaminepenta(methylenephosphonic acid), 6.5 parts by weight of microcrystalline cellulose, 1.5 parts by weight of aluminum trichloride, 30 parts by weight of 1-methyl-2-pyrrolidone, 6 parts by weight of graphene oxide, 3 parts by weight of 3-aminopropyltrimethoxysilane, 1.5 parts by weight of dicyclohexylcarbodiimide, and 25 parts by weight of toluene.

[0056] Example 3, a weather-resistant EPDM coating, comprising the following components by weight: 38 parts by weight of fluororubber, 15 parts by weight of polytetrafluoroethylene powder, 23 parts by weight of silicone resin, 90 parts by weight of polyurethane resin, 4 parts by weight of nano silver particles, 16 parts by weight of mica powder, 1.5 parts by weight of ultrafine silicon carbide, 11 parts by weight of modified weather-resistant filler, 32 parts by weight of organic solvent, 0.8 parts by weight of initiator, 21 parts by weight of curing agent, 0.8 parts by weight of thickener, 2 parts by weight of pigment, 1 part by weight of dispersant, and 9 parts by weight of anti-cracking agent.

[0057] The organic solvent is a mixture of ethyl acetate and propylene glycol methyl ether acetate, wherein the ratio of ethyl acetate to propylene glycol methyl ether acetate is 1:1;

[0058] The initiator is methyl ethyl ketone peroxide, the curing agent is isophorone diamine, the thickener is hydroxyethyl cellulose, and the dispersant is polyacrylate ammonium salt.

[0059] The anti-cracking agent includes the following weight components: 25 weight parts of terminal hydroxyl polybutadiene, 20 weight parts of epoxy resin E-51, 8 weight parts of nano silicon dioxide, 5 weight parts of dimethyl silicone oil, 3 weight parts of benzotriazole, and 1 weight part of dibutyltin dilaurate.

[0060] The modified weather-resistant filler includes the following components by weight: 20 parts by weight of nano-silicon dioxide, 12 parts by weight of nano-cerium oxide, 5 parts by weight of bis-[γ-(triethoxysilyl)propyl]tetrasulfide, 4 parts by weight of diethylenetriaminepenta(methylenephosphonic acid), 8 parts by weight of microcrystalline cellulose, 2 parts by weight of aluminum trichloride, 35 parts by weight of 1-methyl-2-pyrrolidone, 7 parts by weight of graphene oxide, 4 parts by weight of 3-aminopropyltrimethoxysilane, 2 parts by weight of dicyclohexylcarbodiimide, and 30 parts by weight of toluene.

[0061] Example 4, based on Example 1, Example 2 and Example 3, a method for preparing a weather-resistant EPDM coating comprises the following steps:

[0062] Step A1: Premixing: pour the organic solvent (ethyl acetate and propylene glycol methyl ether acetate mixed in a ratio of 1:1) into a stirring container;

[0063] Add fluororubber, polytetrafluoroethylene powder, silicone resin and polyurethane resin in sequence, stir evenly with a stirrer for 40 minutes at a stirring speed of 600 rpm and the temperature is controlled at 25°C;

[0064] Step A2: adding functional fillers, slowly adding nano silver particles, mica powder, ultrafine silicon carbide, and modified weather-resistant fillers into the premixed solution;

[0065] Use a control system to control a high-speed disperser for dispersion, with a dispersion time of 70 minutes, a dispersion speed of 1800 rpm, and a temperature of 30°C;

[0066] Step A3: Refining treatment: the dispersed coating is transferred to a sand mill for refining treatment. The sand milling time is 2.5 hours, the sand mill speed is 2200 rpm, and the temperature is controlled at 35°C.

[0067] Step A4: Adding additives, adding initiator methyl ethyl ketone peroxide, curing agent isophorone diamine, thickener hydroxyethyl cellulose, pigment, dispersant polyacrylate ammonium salt, and anti-cracking agent to the sand-milled coating in sequence;

[0068] Stir evenly with a stirrer for 50 minutes at a stirring speed of 900 rpm and a temperature of 30°C;

[0069] Step A5: Adjust the pH value and filter. Use a pH meter to measure the pH value of the coating and keep it at around 7.5. If it is not within this range, add an appropriate amount of acid-base regulator to adjust it.

[0070] Step A6: Filter the prepared coating through a filter to remove impurities and obtain a finished coating.

[0071] The method for preparing the modified weather-resistant filler comprises the following steps:

[0072] Step B1: Add nano-silicon dioxide, nano-cerium oxide and graphene oxide to a reaction vessel containing 1-methyl-2-pyrrolidone, turn on the stirrer, and stir at a medium speed (stirring speed is about 150-200 rpm) for 30 minutes to evenly disperse the nanoparticles in the solvent;

[0073] Step B2: Slowly add bis-[γ-(triethoxysilyl)propyl]tetrasulfide and 3-aminopropyltrimethoxysilane and continue stirring for 2 hours;

[0074] Step B3: Add aluminum chloride and stir for 1 hour;

[0075] Step B4: Add dicyclohexylcarbodiimide to a container containing toluene, stir to dissolve, then slowly add to the above reaction system, and continue stirring for 3 hours;

[0076] Step B5: filtering the reaction mixture and washing it with toluene three times to remove unreacted substances and impurities;

[0077] Step B6: Drying at 80-100° C. for 4-6 hours to obtain a modified weather-resistant filler.

[0078] The method for preparing the anti-cracking agent comprises the following steps:

[0079] Step C1: Equipment preparation: a reactor with a stirrer and a thermometer;

[0080] Step C2: Operation steps: Add hydroxy-terminated polybutadiene and epoxy resin E-51 into the reaction kettle, turn on the stirrer, and heat to 70°C;

[0081] Step C3: Slowly add nano-silica and continue stirring for 1 hour;

[0082] Step C4: Add dimethyl silicone oil and benzotriazole, and stir for 30 minutes;

[0083] Step C5: Finally, add dibutyltin dilaurate and stir for 20 minutes to obtain an anti-cracking agent.

[0084] The control method of the control system of step A2 comprises the following steps:

[0085] Step 1: Install a temperature sensor and intelligent temperature control system in the high-speed disperser. The temperature sensor can accurately monitor the temperature changes at every location in the high-speed disperser in real time.

[0086] The intelligent temperature control system has powerful data analysis and automatic adjustment capabilities. When it detects that the temperature deviates from the set range, it can quickly and accurately adjust the heating or cooling power;

[0087] Step 2: Install a torque sensor on the rotating shaft of the high-speed disperser. The torque sensor can flexibly adjust the speed of the stirring motor according to changes in the mixing process;

[0088] Step 3: Introduce advanced online monitoring technology and install a dispersion monitor, which can monitor the viscosity changes of materials in real time and accurately;

[0089] Step 4: The temperature range of the high-speed disperser is strictly set to 30°C. Through a large number of experiments and data analysis, it is determined that within this temperature range, the material can maintain the best fluidity and mixing performance;

[0090] Step 5: Set the dispersion threshold and determine the dispersion range through precise experiments and data analysis according to different mixing stages and material combinations;

[0091] Step 6: According to the above technical solution, the material is dispersed by real-time regulation through the deployment system.

[0092] Key operations such as temperature control and dispersion speed adjustment are explained within a unified 60-minute time frame;

[0093] Among them, temperature control:

[0094] During the entire 60-minute process, a high-precision temperature sensor (with an accuracy of ±0.08°C) is used to collect temperature data at different locations in the mixing container every 30 seconds. During the initial 15-minute heating stage, when the temperature rise rate is detected to deviate from 0.12°C per minute, the control system immediately adjusts the coolant flow rate. If the temperature rises too quickly, the intelligent temperature control system reduces the speed of the coolant circulation pump to reduce the coolant flow rate; otherwise, the speed is appropriately increased.

[0095] During the 15-40 minute constant temperature stage, once the temperature exceeds the range of 30℃±0.3℃, the control system quickly calculates and adjusts the temperature and flow of the coolant in the intelligent temperature control system according to the degree of deviation. When the temperature is higher than the upper limit, the cooling power is increased and the coolant temperature is reduced; when it is lower than the lower limit, the cooling amount is reduced or the coolant temperature is fine-tuned to rise.

[0096] During the 40-60 minute cooling stage, the actual temperature is compared every 2 minutes based on the preset cooling rate curve of 0.08°C per minute. If the cooling is too fast, the control system will fine-tune the coolant flow of the intelligent temperature control system to reduce it; if it is too slow, the flow will be increased or the coolant temperature will be lowered.

[0097] Among them, decentralized speed control:

[0098] Install advanced torque sensors and dispersion monitors. In the initial 10 minutes, when the speed increases from 300 rpm to 20 rpm, the dispersion monitor detects dispersion data every 5 minutes. Determine whether the speed increase is appropriate based on the torque change and dispersion. If the torque increases too quickly but the dispersion does not increase significantly, reduce the speed increase appropriately.

[0099] During the 10-45 minute period, the dispersion is tested every 3 minutes. When the dispersion is lower than the preset standard and the torque is large, the control system further increases the disperser speed; if the dispersion meets the standard but the torque continues to rise, it indicates that excessive shearing or agglomeration may occur, and the speed is reduced and maintained for a period of time for observation.

[0100] During the last 15 minutes of deceleration, the dispersion is tested every 4 minutes. As the speed decreases, if the dispersion shows a downward trend, the deceleration rate should be appropriately slowed down to maintain the dispersion effect and ensure that the coating system is uniform and stable.

[0101] In the above control system, set the common variables:

[0102] T: actual temperature (degrees Celsius);

[0103] t: time (minutes);

[0104] v: disperser speed (r / min);

[0105] D: dispersion;

[0106] 1: Equivalent temperature calculated based on torque;

[0107] Q: Coolant flow rate;

[0108] Among them, the temperature control formula is:

[0109] Heating stage (0-15 minutes):

[0110] Heating rate calculation: , 0≤t≤15, where is the starting temperature;

[0111] Coolant flow adjustment: ,coefficient Determined according to the cooling system characteristics of the intelligent temperature control system, the purpose is to make the heating rate approach 0.12 degrees Celsius per minute;

[0112] Constant temperature stage (15-40 minutes):

[0113] Temperature deviation: ;

[0114] Comprehensive adjustment of coolant flow and temperature: , dynamically adjust the coolant parameters to maintain a constant temperature of 30 degrees Celsius through temperature deviation and its rate of change, coefficient and Related to factors such as the heat exchange efficiency of the cooling system;

[0115] Cooling down phase (40-60 minutes):

[0116] Cooling rate calculation: , 40≤t≤60, where is the temperature at the 40th minute;

[0117] Coolant flow adjustment: ,coefficient During the cooling stage, the temperature is determined according to the characteristics of the cooling system to ensure a cooling rate of 0.08 degrees Celsius per minute;

[0118] Among them, the dispersion speed control formula is:

[0119] Initial acceleration phase (0-10 minutes):

[0120] Dispersion change rate: , 0≤t≤10, where is the initial dispersion;

[0121] Speed ​​adjustment: ,coefficient and They are related to the expected change in dispersion and the energy state of the system, respectively. In the initial stage, the speed increase is adjusted according to the dispersion change and the equivalent temperature.

[0122] Dynamic adjustment phase (10-45 minutes):

[0123] Comprehensive evaluation indicators: , weight coefficient and Weigh the influence of dispersion degree and system energy state on the adjustment of dispersion speed;

[0124] Speed ​​adjustment: ,coefficient Determined based on the characteristics of the disperser and the properties of the coating system, adjust the disperser speed when the comprehensive evaluation index deviates from the set value;

[0125] Slowdown phase (45-60 minutes):

[0126] Dispersion stability assessment: ,in is the dispersion at the previous moment;

[0127] Speed ​​adjustment: ,coefficient Determined according to the desired degree of dispersion stability, the speed reduction amplitude is adjusted according to the dispersion stability during the speed reduction stage to ensure the uniformity of the coating.

[0128] Through the above calculations, the paint preparation control system can accurately control the operating status of the cooling system and disperser according to real-time detected parameters such as temperature, time, and dispersion, ensuring the efficiency and stability of the paint preparation process.

[0129] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A weather-resistant EPDM coating, characterized in that: The invention comprises the following components by weight: 35-40 parts by weight of fluororubber, 10-20 parts by weight of polytetrafluoroethylene powder, 20-25 parts by weight of organic silicon resin, 80-100 parts by weight of polyurethane resin, 3-5 parts by weight of nano silver particles, 15-18 parts by weight of mica powder, 1.3-2 parts by weight of ultrafine silicon carbide, 10-12 parts by weight of modified weather-resistant filler, 30-35 parts by weight of organic solvent, 0.066-1 part by weight of initiator, 20-22 parts by weight of curing agent, 0.4-1 part by weight of thickener, 1.7-2.4 parts by weight of pigment, 0.65-1.2 parts by weight of dispersant and 8-10 parts by weight of anti-cracking agent.

2. A weather-resistant EPDM coating, characterized in that: The invention comprises the following components by weight: 38 parts by weight of fluororubber, 15 parts by weight of polytetrafluoroethylene powder, 23 parts by weight of silicone resin, 90 parts by weight of polyurethane resin, 4 parts by weight of nano silver particles, 16 parts by weight of mica powder, 1.5 parts by weight of ultrafine silicon carbide, 11 parts by weight of modified weather-resistant filler, 32 parts by weight of organic solvent, 0.8 parts by weight of initiator, 21 parts by weight of curing agent, 0.8 parts by weight of thickener, 2 parts by weight of pigment, 1 part by weight of dispersant and 9 parts by weight of anti-cracking agent.

3. The weather-resistant EPDM coating according to claim 1, characterized in that: The modified weather-resistant filler comprises the following components by weight: 15-20 parts by weight of nano silicon dioxide, 8-12 parts by weight of nano cerium oxide, 3-5 parts by weight of bis-[γ-(triethoxysilyl)propyl]tetrasulfide, 2-4 parts by weight of diethylenetriaminepenta(methylenephosphonic acid), 5-8 parts by weight of microcrystalline cellulose, 1-2 parts by weight of aluminum chloride, 25-35 parts by weight of 1-methyl-2-pyrrolidone, 5-7 parts by weight of graphene oxide, 2-4 parts by weight of 3-aminopropyltrimethoxysilane, 1-2 parts by weight of dicyclohexylcarbodiimide, and 20-30 parts by weight of toluene.

4. The weather-resistant EPDM coating according to claim 1, characterized in that: The organic solvent is a mixture of ethyl acetate and propylene glycol methyl ether acetate, wherein the ratio of ethyl acetate to propylene glycol methyl ether acetate is 1:1; The initiator is methyl ethyl ketone peroxide, the curing agent is isophorone diamine, the thickener is hydroxyethyl cellulose, and the dispersant is polyacrylate ammonium salt.

5. The weather-resistant EPDM coating according to claim 1, characterized in that: The anti-cracking agent comprises the following components by weight: 25 parts by weight of terminal hydroxyl polybutadiene, 20 parts by weight of epoxy resin E-51, 8 parts by weight of nano silicon dioxide, 5 parts by weight of dimethyl silicone oil, 3 parts by weight of benzotriazole, and 1 part by weight of dibutyltin dilaurate.

6. A method for preparing a weather-resistant EPDM coating, characterized in that: The following steps are included: Step A1: Premixing: pour the organic solvent (ethyl acetate and propylene glycol methyl ether acetate mixed in a ratio of 1:1) into a stirring container; Add fluororubber, polytetrafluoroethylene powder, silicone resin and polyurethane resin in sequence, stir evenly with a stirrer for 40 minutes at a stirring speed of 600 rpm and the temperature is controlled at 25°C; Step A2: adding functional fillers, slowly adding nano silver particles, mica powder, ultrafine silicon carbide, and modified weather-resistant fillers into the premixed solution; Use a control system to control a high-speed disperser for dispersion, with a dispersion time of 70 minutes, a dispersion speed of 1800 rpm, and a temperature of 30°C; Step A3: fine processing, the dispersed coating is transferred to a sand mill for fine processing, the sand milling time is 2.5 hours, the sand mill speed is 2200 rpm, and the temperature is controlled at 35°C; Step A4: Adding additives, adding initiator methyl ethyl ketone peroxide, curing agent isophorone diamine, thickener hydroxyethyl cellulose, pigment, dispersant polyacrylate ammonium salt, and anti-cracking agent to the sand-milled coating in sequence; Stir evenly with a stirrer for 50 minutes at a stirring speed of 900 rpm and a temperature of 30°C; Step A5: Adjust the pH value and filter. Use a pH meter to measure the pH value of the coating and keep it at around 7.

5. If it is not within this range, add an appropriate amount of acid-base regulator to adjust it. Step A6: Filter the prepared coating through a filter to remove impurities and obtain a finished coating.

7. The method for preparing a weather-resistant EPDM coating according to claim 6, characterized in that: The method for preparing the modified weather-resistant filler comprises the following steps: Step B1: Add nano-silicon dioxide, nano-cerium oxide and graphene oxide to a reaction vessel containing 1-methyl-2-pyrrolidone, turn on the stirrer, and stir at a medium speed (stirring speed is about 150-200 rpm) for 30 minutes to evenly disperse the nanoparticles in the solvent; Step B2: Slowly add bis-[γ-(triethoxysilyl)propyl]tetrasulfide and 3-aminopropyltrimethoxysilane and continue stirring for 2 hours; Step B3: Add aluminum chloride and stir for 1 hour; Step B4: Add dicyclohexylcarbodiimide to a container containing toluene, stir to dissolve, then slowly add to the above reaction system, and continue stirring for 3 hours; Step B5: filtering the reaction mixture and washing it with toluene three times to remove unreacted substances and impurities; Step B6: Drying at 80-100° C. for 4-6 hours to obtain a modified weather-resistant filler.

8. The method for preparing a weather-resistant EPDM coating according to claim 6, characterized in that: The method for preparing the anti-cracking agent comprises the following steps: Step C1: Equipment preparation: a reactor with a stirrer and a thermometer; Step C2: Operation steps: Add hydroxy-terminated polybutadiene and epoxy resin E-51 into the reaction kettle, turn on the stirrer, and heat to 70°C; Step C3: Slowly add nano-silica and continue stirring for 1 hour; Step C4: Add dimethyl silicone oil and benzotriazole, and stir for 30 minutes; Step C5: Finally, add dibutyltin dilaurate and stir for 20 minutes to obtain an anti-cracking agent.

9. The method for preparing a weather-resistant EPDM coating according to claim 6, characterized in that: The control method of the control system of step A2 comprises the following steps: Step 1: Install a temperature sensor and intelligent temperature control system in the high-speed disperser. The temperature sensor can accurately monitor the temperature changes at every location in the high-speed disperser in real time. The intelligent temperature control system has powerful data analysis and automatic adjustment capabilities. When it detects that the temperature deviates from the set range, it can quickly and accurately adjust the heating or cooling power; Step 2: Install a torque sensor on the rotating shaft of the high-speed disperser. The torque sensor can flexibly adjust the speed of the stirring motor according to changes in the mixing process; Step 3: Introduce advanced online monitoring technology and install a dispersion monitor, which can monitor the viscosity changes of materials in real time and accurately; Step 4: The temperature range of the high-speed disperser is strictly set to 30°C. Through a large number of experiments and data analysis, it is determined that within this temperature range, the material can maintain the best fluidity and mixing performance; Step 5: Set the dispersion threshold and determine the dispersion range through precise experiments and data analysis according to different mixing stages and material combinations; Step 6: According to the above technical solution, the material is dispersed by real-time regulation through the deployment system.