High-temperature-resistant ethylene-propylene-diene monomer coating and preparation method thereof

Abstract

The high-temperature-resistant ethylene-propylene-diene monomer coating is prepared from the following components in parts by weight: 38 to 42 parts of fluororubber, 14 to 16 parts of polytetrafluoroethylene powder, 2.5 to 3.5 parts of nano-silver particles, 22 to 24 parts of organic silicon resin, 14 to 16 parts of mica powder, 95 to 105 parts of polyurethane resin, 17 to 18 parts of high-temperature-resistant anti-cracking agent, 28 to 32 parts of organic solvent, 0.065 to 0.068 part of initiator and 1.25 to 1.35 parts of ultramicro silicon carbide. The invention relates to the technical field of preparation of ethylene-propylene-diene monomer coatings, in particular to an ethylene-propylene-diene monomer coating. The ethylene-propylene-diene monomer coating comprises the following components in parts by weight: 19-21 parts of curing agent, 0.38-0.42 part of thickening agent, 1.65-1.75 parts of pigment and 0.62-0.68 part of According to the high-temperature-resistant ethylene-propylene-diene monomer coating, the fluororubber, the organic silicon resin and other high-temperature-resistant materials are adopted in the formula, so that the coating can keep stable performance in a high-temperature environment and is not prone to softening, deformation or loss of adhesive force, and the wear resistance of the coating is remarkably improved by adding the polytetrafluoroethylene powder, the ultra-micro silicon carbide and other fillers; friction and abrasion can be effectively resisted, and the service life of the coating is prolonged.

Description

Technical Field

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

[0002] With the continuous development of modern industry, the demand for high-performance coatings is growing. Among many coatings, high-temperature resistant coatings have important application value in aerospace, automobile manufacturing, petrochemical and other fields. Traditional coatings are often prone to cracking, peeling and other problems in high temperature environments, and cannot meet the use requirements under special working conditions. In order to solve this problem, researchers are committed to developing new high-temperature resistant EPDM coatings. EPDM rubber itself has excellent aging resistance, chemical corrosion resistance and other properties, but the performance of pure EPDM rubber coatings at high temperatures still needs to be improved. Therefore, the development of a high-temperature resistant EPDM coating with a precise mixing and control system is of great practical significance for meeting the needs of modern industry for high-performance coatings. Summary of the invention

[0003] To achieve the above purpose, the present invention is implemented by the following technical scheme: a high temperature resistant EPDM coating and a preparation method thereof, comprising the following components by weight: 38-42 parts of fluororubber, 14-16 parts of polytetrafluoroethylene powder, 2.5-3.5 parts of nano silver particles, 22-24 parts of silicone resin, 14-16 parts of mica powder, 95-105 parts of polyurethane resin, 17-18 parts of high temperature resistant anti-cracking agent, 28-32 parts of organic solvent, 0.065-0.068 parts of initiator, 1.25-1.35 parts of ultrafine silicon carbide, 19-21 parts of curing agent, 0.38-0.42 parts of thickener, 1.65-1.75 parts of pigment, and 0.62-0.68 parts of dispersant; The preparation of the high temperature resistant anti-cracking agent comprises the following steps: Step A1: clean and dry the reactor, add p-phenylenediamine, trimethylolpropane triacrylate, sodium hydroxide and propanol into the reactor according to the weight ratio, turn on the stirrer, stir at a speed of 250-300 rpm, and at the same time, introduce nitrogen to maintain a stable nitrogen flow rate to form a nitrogen atmosphere in the reactor, gradually heat to 84°C, control the temperature fluctuation within the range of ±1°C, and continue stirring for 5.5-6 hours to obtain intermediate 1; Step A2: Add intermediate 1, γ-(2,3-epoxypropyloxy)propylmethyldiethoxysilane and 10% hydrochloric acid into a reactor according to a weight ratio, turn on the stirrer, stir at a speed of 180-250 rpm, and gradually raise the temperature to 46°C. The temperature fluctuation is controlled within the range of ±1°C. After continuous stirring for 3.5-4 hours, connect the reactor to a vacuum distillation apparatus, perform vacuum rotary distillation, remove low-boiling substances, and obtain intermediate 2; Step A3: Add intermediate 2, methyltrichlorosilane, triethanolamine and DMF into a reaction kettle according to the weight ratio, stir at a stirring speed of about 250-300 rpm, gradually heat to 69°C, control the temperature fluctuation within the range of ±1°C, and continue stirring for 2.5-3 hours; Step A4: Add silicone resin, phenolic resin, nano-alumina, silicone elastomer, glass flakes, zinc powder, xylene, leveling agent and defoaming agent to the reaction kettle in sequence, adjust the stirring speed to 180-220 rpm, stir at 46°C for 1.5-2 hours, and control the temperature fluctuation within the range of ±1°C to obtain a high temperature resistant anti-cracking agent.

[0004] Preferably, the organic solvent is any one of xylene and ethyl acetate, the initiator is any one of dibenzoyl peroxide and methyl ethyl ketone peroxide, the curing agent is an amine curing agent, and the thickener is hydroxyethyl cellulose.

[0005] Preferably, the high temperature resistant anti-cracking agent includes the following components by weight: 20-25 parts of p-phenylenediamine, 28-32 parts of trimethylolpropane triacrylate, 6-8 parts of sodium hydroxide, 55-65 parts of propanol, 22-26 parts of γ-(2,3-epoxypropoxy)propylmethyldiethoxysilane, 18-19 parts of 10% hydrochloric acid, 45-50 parts of benzene, 20-24 parts of methyltrichlorosilane, 12-14 parts of triethanolamine, 45-48 parts of DMF, 30-32 parts of silicone resin, 20-26 parts of phenolic resin, 10-16 parts of nano-alumina, 10-12 parts of silicone elastomer, 15-17 parts of glass flakes, 5-7 parts of zinc powder, 15-18 parts of xylene, 0.5-1 part of leveling agent, and 0.5-0.9 part of defoaming agent.

[0006] A method for preparing a high temperature resistant EPDM coating comprises the following preparation steps: Step 1: Add fluororubber to an organic solvent in a reaction kettle with a mixing control system, the amount of organic solvent is 2.5-3 times the weight of the fluororubber, the mixing control system controls stirring at 120-150 rpm, stirring for 40-50 minutes, gradually heating to 45°C, and controlling the temperature fluctuation within the range of ±1°C to obtain a matrix A; Step 2: adding mica powder, polytetrafluoroethylene powder and ultrafine silicon carbide to the matrix A in the reaction kettle in sequence, stirring while adding, controlling the stirring speed to 350-400 rpm by the blending control system, stirring for 10-15 minutes, then adding nano silver particles, silicone resin and polyurethane resin, continuing to stir, controlling the stirring speed to about 220-240 rpm by the blending control system, and continuing to stir for 40-45 minutes to obtain the matrix B; Step 3: Continue to add the high temperature resistant anti-cracking agent to the substrate B in the reaction kettle, and stir for 28-35 minutes at a stirring speed of 180-200 rpm; Step 4: Add initiator and curing agent to the reactor in sequence, stir at a speed of 130-180 / min, stir for 40-50 minutes, then add thickener and pigment in sequence, adjust the stirring speed to 110-180 / min, stir for 20-35 minutes to obtain high temperature resistant EPDM coating.

[0007] Preferably, the pH value in the reaction kettle of steps 1 to 4 is 7.5±0.5.

[0008] Preferably, the curing agent in step 4 is isophorone diamine, and the dispersant is any one of polycarboxylic acid sodium salt and polyacrylate ammonium salt.

[0009] Preferably, the preparation control system in step one includes a temperature control module, a stirring control module and a pH value monitoring module, the temperature control module includes a high-precision temperature detector and an intelligent temperature control device, the high-precision temperature detector is installed at different positions in the reactor, monitors the temperature changes in the reactor in real time, and accurately transmits the temperature data to the intelligent temperature control device, the intelligent temperature control device accurately controls the heating power according to the data fed back by the temperature sensor, the stirring control module includes a stirring motor controller and a uniformity detector, the stirring motor controller is used to control the speed of the stirring motor according to different preparation steps, the uniformity detector is installed at different positions in the reactor, monitors the mixing uniformity of the materials during the stirring process in real time, and transmits the detected material mixing state data to the control system, the pH value monitoring module is used to monitor the pH value in the reactor in real time, and remind the operator to make adjustments when the pH value deviates from the set range.

[0010] Preferably, the control method of the deployment control system comprises the following steps: Step 1: Add fluororubber to the organic solvent in the reactor, the amount of organic solvent is 2.5-3 times the weight of fluororubber, use a high-precision temperature detector to monitor the temperature in the reactor in real time, control the temperature inside the reactor through the connected intelligent temperature control device, and control the stirring structure to stir at 120-150 rpm. At the same time, use a heating device to slowly heat up to 45°C, control the temperature fluctuation within the range of ±1°C, stir for 40-50 minutes, and obtain matrix A. During the stirring process, the stirring uniformity is monitored in real time through multiple uniformity detectors installed at different positions in the reactor. If the uniformity does not meet the set standard, the control system will make the following adjustments according to the actual situation; Step 2: Add mica powder, polytetrafluoroethylene powder, and ultrafine silicon carbide to the matrix A of the reactor in sequence, stir while adding, and control the stirring speed to 350-400 rpm by the blending control system, and stir for 10-15 minutes. During this process, the temperature is maintained at the current stable state. If temperature fluctuations occur, the intelligent temperature control device promptly starts compensation measures to ensure that the temperature is always within the set range. At the same time, the uniformity detector continues to work to ensure that the materials are fully mixed. Then, add nanosilver particles, silicone resin, and polyurethane resin, and continue to stir. The blending control system controls the stirring speed to be about 220-240 rpm, and continue to stir for 40-45 minutes to obtain matrix B; Step 3: Continue to add high temperature resistant anti-cracking agent to the matrix B in the reactor, control the stirring speed to 180-200 rpm by the mixing control system, and stir for 28-35 minutes. During this period, the temperature remains stable, and the intelligent temperature control equipment continuously monitors to prevent temperature changes caused by external factors. The stirring uniformity sensor feeds back the stirring condition in real time. If unevenness is found, adjust the stirring parameters in time; Step 4: Add initiator and curing agent to the reactor in sequence, control the stirring speed to 130-180 rpm by the mixing control system, stir for 40-50 minutes, then add thickener and pigment in sequence, adjust the stirring speed to 110-180 rpm, stir for 20-35 minutes to obtain high temperature resistant EPDM coating. During the whole process, the temperature is always strictly controlled within the set range. If the temperature is abnormal, the intelligent temperature control device will immediately issue an alarm and take corresponding measures to adjust. At the same time, the stirring uniformity sensor continuously monitors the stirring effect to ensure that the coating is evenly mixed. Wherein, during step 1 to step 4, the pH value in the reactor is 7.5±0.5.

[0011] Preferably, after the stirring in step 1 to step 4 is completed, if the uniformity is less than 10% of the standard and the current stirring speed is 120 rpm, the control system gradually increases the stirring speed to 130 rpm and extends the stirring time by 5-10 minutes, so as to increase the mixing degree of the materials and improve the uniformity; If the uniformity is more than 10% lower than the standard, the control system will first increase the stirring speed to 140-150 rpm, and after stirring for a period of time, reduce it to 120-130 rpm for stable stirring, and extend the stirring time by 10-15 minutes. By accelerating the stirring first and then stabilizing the stirring, the uneven situation can be improved in a shorter time, while avoiding other problems caused by excessive stirring.

[0012] Preferably, in the steps 1 to 4, in order to control the temperature within the set range, the intelligent temperature control device will continuously adjust the heating power according to the feedback of the temperature detector. In the early stage of heating, when the temperature rises slowly, the intelligent temperature control device increases the heating power to speed up the heating speed. When the temperature approaches 45°C, the heating power is reduced and fine-tuning is performed. If the temperature rises too quickly, the heating may be temporarily stopped, and fine adjustments will be made after the temperature stabilizes. When the temperature exceeds 46°C, the intelligent temperature control device immediately initiates the following adjustment measures: (1) Reduce the heating power to zero, start the cooling device, and speed up the heat dissipation; (2) Check whether the heating device is faulty. If there is any fault, repair or replace it in time; (3) Check whether the abnormal temperature rise is caused by external environmental influences. If so, take insulation measures to reduce the transfer of external heat into the reactor.

[0013] The present invention provides a high temperature resistant EPDM coating and a preparation method thereof, which has the following beneficial effects: The formula uses high-temperature resistant materials such as fluororubber and silicone resin, so that the coating can maintain stable performance in high-temperature environments and is not easy to soften, deform or lose adhesion. The addition of fillers such as polytetrafluoroethylene powder and ultra-fine silicon carbide significantly improves the wear resistance of the coating, can effectively resist friction and wear, and extend the service life of the coating. The specially prepared high-temperature resistant anti-cracking agent effectively prevents the coating from cracking under adverse conditions such as high temperature and stress through complex chemical reactions and the synergistic effect of multiple components. After actual testing, the coating can still remain intact under extreme temperature changes and mechanical stress without obvious cracks. The addition of nano-silver particles gives the coating antibacterial properties, which can Inhibit the growth of microorganisms such as bacteria and mold, keep the coating surface clean and hygienic, the choice of pigments can be customized in different colors according to needs, so that the coating has a good appearance effect and meets various decorative needs. The coating can form a uniform and smooth coating after construction to improve the aesthetics of the coated object. The reactor with a mixing control system can accurately control parameters such as temperature and stirring speed to ensure the stability and consistency of the preparation process. The step-by-step preparation method allows the components to be fully mixed and evenly mixed, thereby improving the quality and performance of the coating. Organic solvents, initiators, curing agents, etc. can be selected in different types according to actual needs, which increases the adaptability and flexibility of the coating. DETAILED DESCRIPTION

[0014] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0015] In the first embodiment, the present invention provides a technical solution: a high temperature resistant EPDM coating, comprising the following components by weight: 38 parts of fluororubber, 14 parts of polytetrafluoroethylene powder, 2.5 parts of nano silver particles, 22 parts of silicone resin, 14 parts of mica powder, 95 parts of polyurethane resin, 17 parts of high temperature resistant anti-cracking agent, 28 parts of organic solvent, 0.065 parts of initiator, 1.25 parts of ultrafine silicon carbide, 19 parts of curing agent, 0.38 parts of thickener, 1.65 parts of pigment, and 0.62 parts of dispersant; The high temperature resistant anti-cracking agent comprises the following components by weight: 20 parts of p-phenylenediamine, 28 parts of trimethylolpropane triacrylate, 6 parts of sodium hydroxide, 55 parts of propanol, 22 parts of γ-(2,3-epoxypropoxy)propylmethyldiethoxysilane, 18 parts of 10% hydrochloric acid, 45 parts of benzene, 20 parts of methyltrichlorosilane, 12 parts of triethanolamine, 45 parts of DMF, 30 parts of silicone resin, 20 parts of phenolic resin, 10 parts of nano-alumina, 10 parts of silicone elastomer, 15 parts of glass flakes, 5 parts of zinc powder, 15 parts of xylene, 0.5 parts of leveling agent, and 0.5 parts of defoaming agent; The preparation method is as follows: S1, preparing a high temperature resistant anti-cracking agent; Step A1: clean and dry the reactor, add p-phenylenediamine, trimethylolpropane triacrylate, sodium hydroxide and propanol into the reactor according to the weight ratio, turn on the stirrer, stir at a speed of 250 rpm, and at the same time, introduce nitrogen to maintain a stable nitrogen flow rate to form a nitrogen atmosphere in the reactor, gradually raise the temperature to 84°C, control the temperature fluctuation within the range of ±1°C, and continue stirring for 5.5 hours to obtain intermediate 1; Step A2: Add intermediate 1, γ-(2,3-epoxypropyloxy)propylmethyldiethoxysilane and 10% hydrochloric acid into a reactor according to a weight ratio, turn on the stirrer, stir at a speed of 180 rpm, and gradually heat to 46°C, control the temperature fluctuation within the range of ±1°C, continue stirring and react for 3.5 hours, connect the reactor to a vacuum distillation apparatus, perform vacuum rotary distillation, remove low-boiling substances, and obtain intermediate 2; Step A3: Add intermediate 2, methyltrichlorosilane, triethanolamine and DMF into a reaction kettle according to the weight ratio, stir at a stirring speed of about 250 rpm, gradually raise the temperature to 69°C, control the temperature fluctuation within the range of ±1°C, and continue stirring to react for 2.5 hours; Step A4: Add silicone resin, phenolic resin, nano-alumina, silicone elastomer, glass flakes, zinc powder, xylene, leveling agent and defoaming agent to the reaction kettle in sequence, adjust the stirring speed to 180 rpm, stir at 46° C. for 1.5 hours, and control the temperature fluctuation within the range of ±1° C. to obtain a high temperature resistant anti-cracking agent; S2. Add fluororubber to the organic solvent in the reactor, the amount of organic solvent is 2.5 times the weight of fluororubber, use a high-precision temperature detector to monitor the temperature in the reactor in real time, control the temperature inside the reactor through the connected intelligent temperature control device, and adjust the control system to control the stirring structure to stir at 120 rpm. At the same time, use a heating device to slowly heat up to 45°C, control the temperature fluctuation within the range of ±1°C, stir for 40 minutes, and obtain matrix A. During the stirring process, the stirring uniformity is monitored in real time by multiple uniformity detectors installed at different positions in the reactor. If the uniformity does not meet the set standard, the control system will make the following adjustments according to the actual situation; S3, sequentially add mica powder, polytetrafluoroethylene powder, and ultrafine silicon carbide to the matrix A of the reactor, stir while adding, and control the stirring speed to 350 rpm by the deployment control system, and stir for 10 minutes. During this process, the temperature is maintained at the current stable state. If temperature fluctuations occur, the intelligent temperature control device promptly starts compensation measures to ensure that the temperature is always within the set range. At the same time, the uniformity detector continues to work to ensure that the materials are fully mixed, and then add nano silver particles, silicone resin and polyurethane resin, continue to stir, and the deployment control system controls the stirring speed to be about 220 rpm, and continue to stir for 40 minutes to obtain matrix B; S4. Continue to add high temperature resistant anti-cracking agent to the matrix B in the reactor, and control the stirring speed to 180 rpm with the control system, stirring for 28 minutes, during which the temperature remains stable, and the intelligent temperature control equipment continuously monitors to prevent temperature changes caused by external factors. The stirring uniformity sensor provides real-time feedback on the stirring condition, and if unevenness is found, the stirring parameters are adjusted in time; S5. Add initiator and curing agent to the reactor in sequence, control the stirring speed to 130 rpm with the mixing control system, stir for 40 minutes, then add thickener and pigment in sequence, adjust the stirring speed to 110 rpm, stir for 20 minutes to obtain high temperature resistant EPDM coating. During the whole process, the temperature is always strictly controlled within the set range. If the temperature is abnormal, the intelligent temperature control equipment will immediately issue an alarm and take corresponding measures to adjust. At the same time, the stirring uniformity sensor will continuously monitor the stirring effect to ensure that the coating is evenly mixed.

[0016] After the stirring in step 1 to step 4 is completed, if the uniformity is less than 10% of the standard and the current stirring speed is 120 rpm, the control system gradually increases the stirring speed to 130 rpm and extends the stirring time by 5 minutes, which can increase the mixing degree of the materials and improve the uniformity; If the uniformity is more than 10% lower than the standard, the control system will first increase the stirring speed to 140 rpm, and after stirring for a period of time, reduce it to 120 rpm for stable stirring, and extend the stirring time by 10 minutes. By accelerating the stirring first and then stabilizing the stirring, the uneven situation can be improved in a shorter time, while avoiding other problems caused by excessive stirring.

[0017] In the steps 1 to 4, in order to control the temperature within the set range, the intelligent temperature control device will continuously adjust the heating power according to the feedback of the temperature detector. In the early stage of heating, when the temperature rises slowly, the intelligent temperature control device increases the heating power to speed up the heating speed. When the temperature approaches 45°C, the heating power is reduced and fine-tuned. If the temperature rises too quickly, the heating may be temporarily stopped and fine-tuned after the temperature stabilizes. When the temperature exceeds 46°C, the intelligent temperature control device immediately initiates the following adjustment measures: (1) Reduce the heating power to zero, start the cooling device, and speed up the heat dissipation; (2) Check whether the heating device is faulty. If there is any fault, repair or replace it in time; (3) Check whether the abnormal temperature rise is caused by external environmental influences. If so, take insulation measures to reduce the transfer of external heat into the reactor.

[0018] In the second embodiment, the present invention provides a technical solution: a high temperature resistant EPDM coating, comprising the following components by weight: 42 parts of fluororubber, 16 parts of polytetrafluoroethylene powder, 3.5 parts of nano silver particles, 24 parts of silicone resin, 16 parts of mica powder, 105 parts of polyurethane resin, 18 parts of high temperature resistant anti-cracking agent, 32 parts of organic solvent, 0.068 parts of initiator, 1.35 parts of ultrafine silicon carbide, 21 parts of curing agent, 0.42 parts of thickener, 1.75 parts of pigment, and 0.68 parts of dispersant; The high temperature resistant anti-cracking agent comprises the following components by weight: 25 parts of p-phenylenediamine, 32 parts of trimethylolpropane triacrylate, 8 parts of sodium hydroxide, 65 parts of propanol, 26 parts of γ-(2,3-epoxypropoxy)propylmethyldiethoxysilane, 19 parts of hydrochloric acid with a concentration of 10%, 50 parts of benzene, 24 parts of methyltrichlorosilane, 14 parts of triethanolamine, 48 parts of DMF, 32 parts of silicone resin, 26 parts of phenolic resin, 16 parts of nano-alumina, 12 parts of silicone elastomer, 17 parts of glass flakes, 7 parts of zinc powder, 18 parts of xylene, 1 part of leveling agent, and 0.9 parts of defoaming agent; The preparation method is as follows: S1, preparing a high temperature resistant anti-cracking agent; Step A1: clean and dry the reactor, add p-phenylenediamine, trimethylolpropane triacrylate, sodium hydroxide and propanol into the reactor according to the weight ratio, turn on the stirrer, stir at a speed of 250 rpm, and at the same time, introduce nitrogen to maintain a stable nitrogen flow rate to form a nitrogen atmosphere in the reactor, gradually raise the temperature to 84°C, control the temperature fluctuation within the range of ±1°C, and continue stirring for 5.5 hours to obtain intermediate 1; Step A2: Add intermediate 1, γ-(2,3-epoxypropyloxy)propylmethyldiethoxysilane and 10% hydrochloric acid into a reactor according to a weight ratio, turn on the stirrer, stir at a speed of 180 rpm, and gradually heat to 46°C, control the temperature fluctuation within the range of ±1°C, continue stirring and react for 3.5 hours, connect the reactor to a vacuum distillation apparatus, perform vacuum rotary distillation, remove low-boiling substances, and obtain intermediate 2; Step A3: Add intermediate 2, methyltrichlorosilane, triethanolamine and DMF into a reaction kettle according to the weight ratio, stir at a stirring speed of about 250 rpm, gradually raise the temperature to 69°C, control the temperature fluctuation within the range of ±1°C, and continue stirring to react for 2.5 hours; Step A4: Add silicone resin, phenolic resin, nano-alumina, silicone elastomer, glass flakes, zinc powder, xylene, leveling agent and defoaming agent to the reaction kettle in sequence, adjust the stirring speed to 180 rpm, stir at 46° C. for 1.5 hours, and control the temperature fluctuation within the range of ±1° C. to obtain a high temperature resistant anti-cracking agent; S2. Add fluororubber to the organic solvent in the reactor, the amount of organic solvent is 2.5 times the weight of fluororubber, use a high-precision temperature detector to monitor the temperature in the reactor in real time, control the temperature inside the reactor through the connected intelligent temperature control device, and adjust the control system to control the stirring structure to stir at 120 rpm. At the same time, use a heating device to slowly heat up to 45°C, control the temperature fluctuation within the range of ±1°C, stir for 40 minutes, and obtain matrix A. During the stirring process, the stirring uniformity is monitored in real time by multiple uniformity detectors installed at different positions in the reactor. If the uniformity does not meet the set standard, the control system will make the following adjustments according to the actual situation; S3, sequentially add mica powder, polytetrafluoroethylene powder, and ultrafine silicon carbide to the matrix A of the reactor, stir while adding, and control the stirring speed to 350 rpm by the deployment control system, and stir for 10 minutes. During this process, the temperature is maintained at the current stable state. If temperature fluctuations occur, the intelligent temperature control device promptly starts compensation measures to ensure that the temperature is always within the set range. At the same time, the uniformity detector continues to work to ensure that the materials are fully mixed, and then add nano silver particles, silicone resin and polyurethane resin, continue to stir, and the deployment control system controls the stirring speed to be about 220 rpm, and continue to stir for 40 minutes to obtain matrix B; S4. Continue to add high temperature resistant anti-cracking agent to the matrix B in the reactor, and control the stirring speed to 180 rpm with the control system, stirring for 28 minutes, during which the temperature remains stable, and the intelligent temperature control equipment continuously monitors to prevent temperature changes caused by external factors. The stirring uniformity sensor provides real-time feedback on the stirring condition, and if unevenness is found, the stirring parameters are adjusted in time; S5. Add initiator and curing agent to the reactor in sequence, control the stirring speed to 130 rpm with the mixing control system, stir for 40 minutes, then add thickener and pigment in sequence, adjust the stirring speed to 110 rpm, stir for 20 minutes to obtain high temperature resistant EPDM coating. During the whole process, the temperature is always strictly controlled within the set range. If the temperature is abnormal, the intelligent temperature control equipment will immediately issue an alarm and take corresponding measures to adjust. At the same time, the stirring uniformity sensor will continuously monitor the stirring effect to ensure that the coating is evenly mixed.

[0019] After the stirring in step 1 to step 4 is completed, if the uniformity is less than 10% of the standard and the current stirring speed is 120 rpm, the control system gradually increases the stirring speed to 130 rpm and extends the stirring time by 5 minutes, which can increase the mixing degree of the materials and improve the uniformity; If the uniformity is more than 10% lower than the standard, the control system will first increase the stirring speed to 140 rpm, and after stirring for a period of time, reduce it to 120 rpm for stable stirring, and extend the stirring time by 10 minutes. By accelerating the stirring first and then stabilizing the stirring, the uneven situation can be improved in a shorter time, while avoiding other problems caused by excessive stirring.

[0020] In the steps 1 to 4, in order to control the temperature within the set range, the intelligent temperature control device will continuously adjust the heating power according to the feedback of the temperature detector. In the early stage of heating, when the temperature rises slowly, the intelligent temperature control device increases the heating power to speed up the heating speed. When the temperature approaches 45°C, the heating power is reduced and fine-tuned. If the temperature rises too quickly, the heating may be temporarily stopped and fine-tuned after the temperature stabilizes. When the temperature exceeds 46°C, the intelligent temperature control device immediately initiates the following adjustment measures: (1) Reduce the heating power to zero, start the cooling device, and speed up the heat dissipation; (2) Check whether the heating device is faulty. If there is any fault, repair or replace it in time; (3) Check whether the abnormal temperature rise is caused by external environmental influences. If so, take insulation measures to reduce the transfer of external heat into the reactor.

[0021] In summary, the high temperature resistant EPDM coating prepared through the steps in the first embodiment has better high temperature resistance.

[0022] 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 high temperature resistant EPDM coating, characterized in that: The invention comprises the following components by weight: 38-42 parts of fluororubber, 14-16 parts of polytetrafluoroethylene powder, 2.5-3.5 parts of nano silver particles, 22-24 parts of silicone resin, 14-16 parts of mica powder, 95-105 parts of polyurethane resin, 17-18 parts of high temperature resistant anti-cracking agent, 28-32 parts of organic solvent, 0.065-0.068 parts of initiator, 1.25-1.35 parts of ultrafine silicon carbide, 19-21 parts of curing agent, 0.38-0.42 parts of thickener, 1.65-1.75 parts of pigment and 0.62-0.68 parts of dispersant; The preparation of the high temperature resistant anti-cracking agent comprises the following steps: Step A1: clean and dry the reactor, add p-phenylenediamine, trimethylolpropane triacrylate, sodium hydroxide and propanol into the reactor according to the weight ratio, turn on the stirrer, stir at a speed of 250-300 rpm, and at the same time, introduce nitrogen to maintain a stable nitrogen flow rate to form a nitrogen atmosphere in the reactor, gradually heat to 84°C, control the temperature fluctuation within the range of ±1°C, and continue stirring for 5.5-6 hours to obtain intermediate 1; Step A2: Add intermediate 1, γ-(2,3-epoxypropyloxy)propylmethyldiethoxysilane and 10% hydrochloric acid into a reactor according to a weight ratio, turn on the stirrer, stir at a speed of 180-250 rpm, and gradually raise the temperature to 46°C. The temperature fluctuation is controlled within the range of ±1°C. After continuous stirring for 3.5-4 hours, connect the reactor to a vacuum distillation apparatus, perform vacuum rotary distillation, remove low-boiling substances, and obtain intermediate 2; Step A3: Add intermediate 2, methyltrichlorosilane, triethanolamine and DMF into a reaction kettle according to the weight ratio, stir at a stirring speed of about 250-300 rpm, gradually heat to 69°C, control the temperature fluctuation within the range of ±1°C, and continue stirring for 2.5-3 hours; Step A4: Add silicone resin, phenolic resin, nano-alumina, silicone elastomer, glass flakes, zinc powder, xylene, leveling agent and defoaming agent to the reaction kettle in sequence, adjust the stirring speed to 180-220 rpm, stir at 46°C for 1.5-2 hours, and control the temperature fluctuation within the range of ±1°C to obtain a high temperature resistant anti-cracking agent.

2. The high temperature resistant EPDM coating according to claim 1, characterized in that: The organic solvent is any one of xylene and ethyl acetate, the initiator is any one of dibenzoyl peroxide and methyl ethyl ketone peroxide, the curing agent is an amine curing agent, and the thickener is hydroxyethyl cellulose.

3. The high temperature resistant EPDM coating according to claim 1, characterized in that: The high temperature resistant anti-cracking agent comprises the following components by weight: 20-25 parts of p-phenylenediamine, 28-32 parts of trimethylolpropane triacrylate, 6-8 parts of sodium hydroxide, 55-65 parts of propanol, 22-26 parts of γ-(2,3-epoxypropoxy)propylmethyldiethoxysilane, 18-19 parts of 10% hydrochloric acid, 45-50 parts of benzene, 20-24 parts of methyltrichlorosilane, 12-14 parts of triethanolamine, 45-48 parts of DMF, 30-32 parts of silicone resin, 20-26 parts of phenolic resin, 10-16 parts of nano-alumina, 10-12 parts of silicone elastomer, 15-17 parts of glass flakes, 5-7 parts of zinc powder, 15-18 parts of xylene, 0.5-1 part of leveling agent and 0.5-0.9 part of defoaming agent.

4. A method for preparing a high temperature resistant EPDM coating, characterized in that: The method comprises the following preparation steps: Step 1: Add fluororubber to an organic solvent in a reaction kettle with a mixing control system, the amount of organic solvent is 2.5-3 times the weight of the fluororubber, the mixing control system controls stirring at 120-150 rpm, stirring for 40-50 minutes, gradually heating to 45°C, and controlling the temperature fluctuation within the range of ±1°C to obtain a matrix A; Step 2: adding mica powder, polytetrafluoroethylene powder and ultrafine silicon carbide to the matrix A in the reaction kettle in sequence, stirring while adding, controlling the stirring speed to 350-400 rpm by the blending control system, stirring for 10-15 minutes, then adding nano silver particles, silicone resin and polyurethane resin, continuing to stir, controlling the stirring speed to about 220-240 rpm by the blending control system, and continuing to stir for 40-45 minutes to obtain the matrix B; Step 3: Continue to add the high temperature resistant anti-cracking agent to the substrate B in the reaction kettle, and stir for 28-35 minutes at a stirring speed of 180-200 rpm; Step 4: Add initiator and curing agent to the reactor in sequence, stir at a speed of 130-180 / min, stir for 40-50 minutes, then add thickener and pigment in sequence, adjust the stirring speed to 110-180 / min, stir for 20-35 minutes to obtain high temperature resistant EPDM coating.

5. The method for preparing a high temperature resistant EPDM coating according to claim 4, characterized in that: The pH value in the reaction kettle from step 1 to step 4 is 7.5±0.

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6. The method for preparing a high temperature resistant EPDM coating according to claim 4, characterized in that: The curing agent in step 4 is isophorone diamine, and the dispersant is any one of polycarboxylic acid sodium salt and polyacrylate ammonium salt.

7. The method for preparing a high temperature resistant EPDM coating according to claim 4, characterized in that: The preparation control system in step one includes a temperature control module, a stirring control module and a pH value monitoring module. The temperature control module includes a high-precision temperature detector and an intelligent temperature control device. The high-precision temperature detector is installed at different positions in the reactor to monitor the temperature change in the reactor in real time and accurately transmit the temperature data to the intelligent temperature control device. The intelligent temperature control device accurately controls the heating power according to the data fed back by the temperature sensor. The stirring control module includes a stirring motor controller and a uniformity detector. The stirring motor controller is used to control the speed of the stirring motor according to different preparation steps. The uniformity detector is installed at different positions in the reactor to monitor the mixing uniformity of the materials during the stirring process in real time and transmit the detected material mixing state data to the control system. The pH value monitoring module is used to monitor the pH value in the reactor in real time. When the pH value deviates from the set range, the operator is reminded to make adjustments.

8. The method for preparing a high temperature resistant EPDM coating according to claim 7, characterized in that: The control method of the deployment control system comprises the following steps: Step 1: Add fluororubber to the organic solvent in the reactor, the amount of organic solvent is 2.5-3 times the weight of fluororubber, use a high-precision temperature detector to monitor the temperature in the reactor in real time, control the temperature inside the reactor through the connected intelligent temperature control device, and control the stirring structure to stir at 120-150 rpm. At the same time, use a heating device to slowly heat up to 45°C, control the temperature fluctuation within the range of ±1°C, stir for 40-50 minutes, and obtain a matrix A. During the stirring process, the stirring uniformity is monitored in real time by multiple uniformity detectors installed at different positions in the reactor; Step 2: adding mica powder, polytetrafluoroethylene powder and ultrafine silicon carbide to the matrix A in the reaction kettle in sequence, stirring while adding, the mixing control system controls the stirring speed to increase to 350-400 rpm, stirring for 10-15 minutes, and the uniformity detector continues to work, then adding nano silver particles, silicone resin and polyurethane resin, continuing to stir, the mixing control system controls the stirring speed to about 220-240 rpm, and continuing to stir for 40-45 minutes to obtain matrix B; Step 3: Continue to add high temperature resistant anti-cracking agent to the matrix B in the reactor, control the stirring speed to 180-200 rpm by the mixing control system, and stir for 28-35 minutes. During this period, the temperature remains stable, the intelligent temperature control equipment continuously monitors, and the stirring uniformity sensor feeds back the stirring condition in real time. If unevenness is found, adjust the stirring parameters in time; Step 4: Add initiator and curing agent to the reaction kettle in sequence, control the stirring speed to 130-180 rpm by the mixing control system, stir for 40-50 minutes, then add thickener and pigment in sequence, adjust the stirring speed to 110-180 rpm, stir for 20-35 minutes to obtain high temperature resistant EPDM coating; Wherein, during step 1 to step 4, the pH value in the reactor is 7.5±0.

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9. The method for preparing a high temperature resistant EPDM coating according to claim 8, characterized in that: After the stirring in step 1 to step 4 is completed, if the uniformity is less than 10% of the standard and the current stirring speed is 120 rpm, the control system gradually increases the stirring speed to 130 rpm and extends the stirring time by 5-10 minutes; If the uniformity is more than 10% lower than the standard, the control system will first increase the stirring speed to 140-150 rpm, and after stirring for a period of time, reduce it to 120-130 rpm for stable stirring, and extend the stirring time by 10-15 minutes.

10. The method for preparing a high temperature resistant EPDM coating according to claim 8, characterized in that: In the steps 1 to 4, in order to control the temperature within the set range, the intelligent temperature control device will continuously adjust the heating power according to the feedback of the temperature detector. In the early stage of heating, when the temperature rises slowly, the intelligent temperature control device increases the heating power to speed up the heating speed. When the temperature approaches 45°C, the heating power is reduced and fine-tuned. If the temperature rises too quickly, wait until the temperature stabilizes before making fine adjustments. When the temperature exceeds 46°C, the adjustment measures of the intelligent temperature control equipment include: (1) Reduce the heating power to zero and start the cooling device; (2) Check whether the heating device is faulty; (3) Check whether the abnormal temperature rise is caused by external environmental influences.