Preparation method of waterborne epoxy zinc-rich primer

Abstract

The invention belongs to the technical field of primer preparation, and particularly relates to a preparation method of a waterborne epoxy zinc-rich primer, which comprises the following steps: selecting and preparing raw materials: dividing the raw materials into a component A and a component B, and respectively blending; based on the preparation command, the adding amount of each raw material is controlled; preparing and mixing: mixing the component A and the component B according to a preset mass ratio after blending is completed to obtain a primer; the adding amount of a component A and the adding amount of a component B are monitored, monitoring values of all raw materials are obtained according to the monitoring values, the monitoring values are obtained mainly depending on a flow meter, when verification passes, it is indicated that the adding amount of all the raw materials is consistent with the adding amount preset value, carried in a preparation command, of all the raw materials, and at the moment, a central control system controls first valves to be opened in sequence; the prepared component A and the prepared component B sequentially enter the material mixing chamber, and after the component A and the component B enter the material mixing chamber, the central control system controls the component A and the component B to be uniformly mixed in the material mixing chamber, so that the primer is obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of primer preparation, in particular to a method for preparing a waterborne epoxy zinc-rich primer. Background Art

[0002] Waterborne epoxy zinc-rich primer is a two-component coating mainly composed of epoxy resin, zinc powder and curing agent. This coating not only has excellent anti-corrosion performance, but is also environmentally friendly because it uses water as a solvent or dispersion medium.

[0003] In the process of preparing waterborne epoxy zinc-rich primer, the preparation of waterborne epoxy zinc-rich primer usually adopts an automatic batching system to control the amount of each raw material added; the automatic batching system generally includes a sensor and a flow meter. Based on the input of the preparation command, the automatic batching system can control the amount of raw materials added and the composition ratio of each raw material according to the preparation command, so as to obtain a primer that meets the preparation command; However, due to reasons such as sensor accuracy, mechanical operation errors and environmental factors, the actual amount of raw materials added may deviate from the preset value; when the automatic batching system deviates in controlling the amount of each raw material added, it will directly lead to deviations in the composition ratio of each raw material, and this deviation may cause unstable performance of the final product and affect the anti-corrosion effect and service life of the coating.

[0004] To this end, the present invention provides a method for preparing a waterborne epoxy zinc-rich primer. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a preparation method of a water-based epoxy zinc-rich primer according to the present invention comprises: Raw material selection and preparation, dividing the raw materials into component A and component B and mixing them separately; Based on the preparation command, control the amount of each raw material added; Preparation and mixing: after the preparation is completed, the component A and the component B are mixed according to a preset mass ratio to obtain a primer; Performance test: the prepared primer is subjected to performance test. When the performance test is passed, the preparation is completed; Among them, controlling the amount of each raw material added also includes: Monitor and record the amount of each raw material added to obtain the monitoring value of the amount of each raw material added; The monitoring value of the added amount of each raw material is verified. When the monitoring value of the added amount of each raw material is consistent with the preset value, the verification is passed, and the first valve between the batching chamber and the mixing chamber is opened in sequence to allow component A and component B to enter the mixing chamber in sequence; Wherein, a double batching chamber is provided, and component A and component B are batched in separate batching chambers respectively.

[0007] Preferably, the method of sequentially opening the valves to allow component A and component B to sequentially enter the mixing chamber further comprises: First, a first valve between a batching chamber and a mixing chamber is opened, and component A or component B enters the mixing chamber; Pre-regulating the temperature of the mixing chamber; Monitoring the temperature of the mixing chamber based on a temperature sensor until the temperature of the mixing chamber reaches a preset temperature and then maintains it; When the temperature of the mixing chamber reaches the preset temperature, a mixing signal is output; The central control system receives a mixable signal and then opens the first valve between another batching chamber and the mixing chamber, and component B or component A enters the mixing chamber and is fully mixed to prepare a primer.

[0008] Preferably, the method of sequentially opening the valves to allow component A and component B to sequentially enter the mixing chamber further comprises: The proportion and amount of raw materials added are input into the mathematical model to predict the time point of VOC generation and the duration of VOC after the A component and B component are mixed; According to the VOC generation time point, the exhaust valve is automatically opened to exhaust; According to the duration of VOC, the exhaust valve is kept open during the VOC generation cycle; The predicted VOC generation time point and duration also includes: Collect historical data, including the proportion and amount of raw materials added, the amount of VOC generated, and the mixing time that affects the generation and volatilization rate of VOCs; Processing of historical data; Based on the processed historical data, a mathematical model of VOC generation and volatilization process is established; Predict VOC production time and duration based on mathematical models.

[0009] Preferably, the performance test of the prepared primer further comprises: Obtaining a sample from the prepared primer; Export samples for performance testing and obtain test reports; When the test passes, the central control system controls the second valve between the mixing chamber and the discharge port to open; when the test fails, a prompt signal is output to the central control system to keep the second valve between the mixing chamber and the discharge port closed.

[0010] Preferably, the sample is output for performance testing and a test report is obtained, further comprising: Based on the test reports of the samples collected in the database, the database is also used to obtain the amount and proportion of each raw material added that matches the sample; Prepare a raw material addition ratio-performance reference table based on the obtained raw material addition amount, addition ratio and corresponding test reports; The test report includes performance information of the sample test.

[0011] Preferably, when the sample test fails, the raw material addition ratio corresponding to the performance of the sample test is obtained according to the raw material addition ratio-performance reference table; According to the initial proportion of the added amount of each raw material, the compensation added amount of any raw material is calculated, and a compensation batching signal is output; The central control system controls the amount of compensation added for each raw material based on the compensation batching signal; After the preparation is completed, the sample is obtained again, and the performance test of the sample is carried out and the test report is output until the performance test of the sample passes.

[0012] Preferably, based on the raw material addition ratio-performance reference table, a correlation model between the raw material addition ratio and the performance test results is established by: Collect the amount and proportion of each raw material added during the preparation of the primer and the corresponding performance test results, i.e., the raw material addition proportion-performance reference table; Clean and pre-process the collected raw material addition amount, addition ratio and corresponding performance test results; Establish a correlation model between raw material addition amount, addition ratio and performance test results based on machine learning model; Extract key raw material characteristics that affect performance based on correlation analysis; Divide historical data into training sets and test sets, which are used to train and test association models respectively; The accuracy and generalization ability of the association models were evaluated by cross-validation method.

[0013] Based on the performance requirements, the association model is used to predict the amount of each raw material added during the automatic batching process.

[0014] Preferably, when any of the monitored values ​​of the added amounts of component A and component B is inconsistent with a preset value, an alarm signal is output and the first valve between the batching chamber and the mixing chamber is kept closed.

[0015] Preferably, after the central control system controls the second valve between the mixing chamber and the material outlet to open, the batching chamber and the mixing chamber are cleaned, and a cleaning signal is output when the cleaning is started; the central control system receives the cleaning signal and maintains the first valve between the batching chamber and the mixing chamber open; The cleaning of the batching chamber and the mixing chamber also includes: When the material is discharged, the completion signal is output; The central control system receives the completion signal and outputs the cleaning instruction; Receive cleaning instructions and start cleaning according to the cleaning instructions.

[0016] Preferably, the preparation command includes the addition ratio and the addition amount of the raw materials of the primer, and also includes the mixing chamber temperature and mixing time during the preparation of the primer; The performance tests include mechanical properties and corrosion resistance tests; wherein the mechanical properties include adhesion, impact resistance, wear resistance and anti-sagging performance; the corrosion resistance includes salt spray, liquid medium resistance, moisture and heat resistance, chemical resistance, electrochemical resistance and long-term exposure performance.

[0017] The beneficial effects of the present invention are as follows: The preparation method of a water-based epoxy zinc-rich primer described in the present invention comprises the following steps: accurately controlling the addition amount of raw materials, and dividing the raw materials into component A and component B for pre-mixing according to the preparation process; and respectively completing the pre-mixed component A and component B in different batching chambers. After the preparation of component A and component B is completed, feedback is waited, that is, waiting for monitoring of the addition amount of component A and component B, and thereby obtaining the monitoring value of each raw material, wherein the monitoring value mainly depends on the acquisition of a flow meter. When the verification is passed, it indicates that the addition amount of each raw material is consistent with the preset value of the addition amount of each raw material carried in the preparation command. At this time, the central control system controls the first valve to be opened in sequence, so that the prepared component A and component B enter the mixing chamber successively. After both component A and component B enter the mixing chamber, the central control system controls component A and component B to be evenly mixed in the mixing chamber to obtain the primer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] like Figure 1As shown, a method for preparing a water-based epoxy zinc-rich primer according to an embodiment of the present invention includes raw material selection and preparation, receiving a preparation command, preparation mixing and performance testing; the raw material selection and preparation is to divide the raw materials into component A and component B and prepare them separately; the receiving of the preparation command is to control the addition amount of each raw material based on the preparation command; the preparation mixing is to mix component A and component B according to a preset mass ratio after the preparation is completed to obtain a primer; the performance test is to perform a performance test on the prepared primer, and when the performance test passes, the preparation is completed; Wherein, controlling the amount of each raw material added also includes detecting the amount of each raw material added and obtaining a monitoring value, and verifying the amount of each raw material added; the detecting the amount of each raw material added and obtaining a monitoring value is to monitor and record the amount of each raw material added, and obtain the monitoring value of the amount of each raw material added; the verifying the amount of each raw material added is to verify the monitoring value of the amount of each raw material added, and when the monitoring value of the amount of each raw material added is consistent with the preset value, the verification is passed, and the first valve between the batching chamber and the mixing chamber is opened in turn to allow component A and component B to enter the mixing chamber in turn; wherein, a double batching chamber is set, and component A and component B are batched in independent batching chambers respectively.

[0022] Based on the above situation, before preparation, it is necessary to debug the equipment and establish a feedback mechanism to prevent the performance of the prepared primer from not matching the expected performance and causing unstable performance. In one embodiment of the present invention, the amount of each raw material added is controlled according to the preparation command output by the central control system, wherein the preparation command carries the composition and addition amount information of the raw materials required for primer preparation; according to the information carried in the preparation command, the amount of raw materials added is accurately controlled, and according to the preparation process, each raw material is divided into component A and component B and pre-mixed; and the pre-mixed component A and component B are respectively mixed at different The preparation of components A and B is completed in the same batching chamber. After the preparation of components A and B is completed, the addition amount of components A and B is monitored, and the monitoring value of each raw material is obtained, wherein the monitoring value mainly depends on the flow meter. When the verification is passed, it means that the addition amount of each raw material is consistent with the preset value of the addition amount of each raw material carried in the preparation command. At this time, the central control system controls the first valve to open in sequence, so that the prepared components A and B enter the mixing chamber successively. After components A and B enter the mixing chamber, the central control system controls components A and B to be evenly mixed in the mixing chamber to obtain a primer; The preparation of component A is specifically to mix waterborne epoxy resin, zinc powder, organic bentonite and additives (such as dispersant, anti-aging agent), stir evenly and filter for later use; The preparation of component B is to mix the curing agent, other additives (such as defoaming agent, leveling agent) and fumed silica, stir them evenly and set them aside; The two-component mixing is specifically to mix the components A and B in a mass ratio (such as between 3:1 and 4.5:1), and stir them thoroughly to ensure uniformity.

[0023] The feedback mechanism established above is helpful to assist the central control system in deciding whether the amount of raw materials added deviates from the preset value, thereby eliminating the unstable factors of primer performance caused by batching deviation during the batching stage.

[0024] In one embodiment, the step of sequentially opening the valves to allow component A and component B to sequentially enter the mixing chamber further includes: First, a first valve between a batching chamber and a mixing chamber is opened, and component A or component B enters the mixing chamber; Pre-regulating the temperature of the mixing chamber; Monitoring the temperature of the mixing chamber based on a temperature sensor until the temperature of the mixing chamber reaches a preset temperature and then maintains it; When the temperature of the mixing chamber reaches the preset temperature, a mixing signal is output; The central control system receives a mixable signal and then opens the first valve between another batching chamber and the mixing chamber, and component B or component A enters the mixing chamber and is fully mixed to prepare a primer.

[0025] Generally speaking, the preparation of epoxy zinc-rich primer cannot be carried out under too cold or too hot conditions. Preparation at abnormal temperature may cause some of the raw materials to react indirectly or excessively, which may easily lead to the primer not matching the expected performance after preparation, resulting in unstable product performance. In one embodiment of the present invention, based on the double batching chamber established above, component A and component B can enter the mixing chamber one after another, and thereby the time when component A and component B enter the mixing chamber can be controlled to avoid component A and component B entering the mixing chamber during the process of entering the mixing chamber. state. In addition, since component A and component B enter the mixing chamber successively, component A or component B which is not sensitive to temperature can be controlled to enter the mixing chamber first, and it will not be affected when the temperature of the mixing chamber is not adjusted to a suitable temperature. When the temperature of the mixing chamber is adjusted to a suitable temperature for preparation, a mixing signal is output, so that the first valve is controlled to open through the central control system, so that component B or component A enters the mixing chamber subsequently. At this time, component A and component B are mixed in the mixing chamber which has been adjusted to a suitable temperature, so as to avoid abnormal temperature affecting the raw materials, thereby causing unstable performance of the prepared primer.

[0026] In one embodiment, the step of sequentially opening the valves to allow component A and component B to sequentially enter the mixing chamber further includes: The proportion and amount of raw materials added are input into the mathematical model to predict the time point of VOC generation and the duration of VOC after the A component and B component are mixed; According to the VOC generation time point, the exhaust valve is automatically opened to exhaust; According to the duration of VOC, the exhaust valve is kept open during the VOC generation cycle; The predicted VOC generation time point and duration also includes: Collect historical data, including the proportion and amount of raw materials added, the amount of VOC generated, and the mixing time that affects the generation and volatilization rate of VOCs; Processing of historical data; Based on the processed historical data, a mathematical model of VOC generation and volatilization process is established; Predict VOC production time and duration based on mathematical models.

[0027] In the process of preparing waterborne epoxy zinc-rich primer, when the waterborne epoxy resin in component A is mixed with the curing agent in component B, volatile organic compounds will be generated. In the process of mixing, VOC will be released and occupy a certain space, and may mix with air to form a gas mixture. As the mixing reaction proceeds, the total amount of gas in the mixing chamber increases, which will cause the air pressure to rise. Excessive air pressure may affect the mixing effect of the raw materials in the preparation process of waterborne epoxy zinc-rich primer, and may cause explosion hazards. Therefore, in one embodiment of the present invention, by collecting historical data, the effect of the addition ratio and amount of raw materials on the VOC output time is obtained. The mathematical model can be trained with historical data to obtain the mathematical model of VOC generation and volatilization process, and then the generation time and duration of VOC after the mixing of component A and component B can be predicted according to the addition ratio and amount of raw materials. Therefore, after the mixing of component A and component B, the central control system can automatically open the exhaust valve to release VOC to avoid excessive VOC concentration and excessive air pressure in the mixing chamber to affect the mixing of component A and component B, and avoid the risk of explosion. After the duration of VOC production ends, the central control system automatically controls the exhaust valve to close, so as to maintain a constant air pressure in the mixing chamber. The construction process of the mathematical model includes: collecting historical data, that is, collecting the mixing ratio data of epoxy resin and curing agent, and obtaining the environmental conditions of the mixing stage, including key characteristics such as temperature and stirring speed, and obtaining the time point and duration of VOC generation, and then cleaning and converting the data; then using the time series model as the basis of the mathematical model, using historical data to train the model, determining the parameters of the model, and constructing the completed mathematical model. By inputting the mixing ratio of epoxy resin and curing agent, as well as inputting environmental conditions and other data, the time point and duration of VOC generation can be predicted; as mentioned above, when component A is mixed with component B, based on the current Environmental conditions can be input into the mathematical model according to the mixing ratio of epoxy resin and curing agent of 8:25 and environmental conditions, such as ambient temperature of 25°C and stirring speed of 400r / min. Then, according to the VOC generation time point predicted by the mathematical model, such as 3min-5min after the start of mixing, the central control system controls the exhaust valve to open to release VOC and avoid excessive VOC content and explosion risk. At the same time, according to the VOC duration predicted by the mathematical model, such as the continuous generation time of VOC is 28min-30min, the central control system can control the exhaust valve to close at about 35min, so as to maintain the constant air pressure in the mixing chamber.

[0028] In one embodiment, the performance test based on the prepared primer also includes obtaining samples and outputting test reports; the obtaining samples is to obtain samples from the prepared primer; the outputting test reports is to output the samples for performance testing and obtain a test report; wherein, when the test passes, the central control system controls the second valve between the mixing chamber and the discharge port to open; when the test fails, a prompt signal is output to the central control system to keep the second valve between the mixing chamber and the discharge port closed.

[0029] When preparing the primer, it is necessary to verify the performance of the primer after preparation in advance, and trace the reasons for the unstable performance of the primer in turn. In one embodiment of the present invention, through historical data and equipment calibration, the primer can be prepared by a primer formula with known performance, and the prepared primer is obtained by controlling variables, and then a sample is obtained, and the performance of the obtained sample is tested to determine the difference between the sample performance and the known performance. It can be determined whether there are influencing factors in the primer preparation process, and the reasons are traced in turn; In the actual preparation process, it is also necessary to test the performance of the prepared primer. For example, for the primer prepared according to the required performance indicators, a sample is first taken for performance testing before discharging. If the performance test passes, the prepared primer is discharged through the discharge port. If the performance test fails, the primer can be reprocessed, downgraded or scrapped by tracing the cause of the unstable performance of the primer. The processing method of the primer can be decided manually, but it is worth noting that if the performance test of the primer fails due to uneven mixing, the primer needs to be reprocessed, that is, continue mixing to ensure uniform mixing before performing a performance test. During reprocessing, the second valve between the mixing chamber and the discharge port needs to be kept closed.

[0030] In one embodiment, the sample is output for performance testing and a test report is obtained, and the test report is collected and a raw material addition ratio-performance reference table is compiled; the collected test report is a test report based on the sample collected in a database, and the database is also used to obtain the amount and ratio of each raw material added that matches the sample; the raw material addition ratio-performance reference table is compiled according to the obtained amount and ratio of each raw material added and the corresponding test report; wherein, the test report includes performance information of the sample test.

[0031] Based on the above, in one embodiment of the present invention, for primers with unknown performance, when conducting performance tests on samples, it is necessary to include the test reports of the samples and obtain the amounts of each raw material added corresponding to the samples. Through the test reports and the corresponding amounts of each raw material added, a raw material addition ratio-performance reference table can be constructed to expand the preparation data of water-based epoxy zinc-rich primers, so that the primer can be prepared according to the corresponding raw material addition ratio-performance reference table only by clarifying the performance indicator requirements.

[0032] In one embodiment, when the sample test fails, the raw material addition ratio corresponding to the performance of the sample test is obtained according to the raw material addition ratio-performance reference table; According to the initial proportion of the added amount of each raw material, the compensation added amount of any raw material is calculated, and a compensation batching signal is output; The central control system controls the amount of compensation added for each raw material based on the compensation batching signal; After the preparation is completed, the sample is obtained again, and the performance test of the sample is carried out and the test report is output until the performance test of the sample passes.

[0033] In the preparation process of epoxy zinc-rich primer, the amount of each raw material added is controlled by the central control system, and the flow meter is used to monitor whether the amount of each raw material added is consistent with the preset value. However, when the flow meter monitors the amount of each raw material added, due to the influence of sensor sensitivity and maintenance cycle, there may be differences or inaccuracies. Therefore, the following situation may occur, that is, when monitoring and verifying the amount of each raw material added, the monitored value of the amount of each raw material added is consistent with the preset value, but in fact, due to the inaccurate monitoring, the amount of each raw material added is not consistent with the preset value, but in the subsequent sample acquisition and sample performance test stage, the sample performance test fails. However, based on this, the raw material addition ratio-performance reference table constructed can be used to obtain the addition ratio of each raw material in the sample, and the addition ratio of each raw material corresponding to the sample can be compared and calculated with the initial ratio of the addition amount of each raw material for preparing the primer, so as to obtain the compensation addition amount of any raw material. In other words, if the addition amount of any raw material is inconsistent with the preset value due to sensor inaccuracy, the compensation addition amount of any raw material can be calculated through the raw material addition ratio-performance reference table, and the compensation addition amount of any raw material can be controlled by the central control system, so that the addition ratio of each raw material in the primer can be consistent with the initial ratio, thereby preparing a primer with required performance; If it is necessary to prepare a water-based epoxy zinc-rich primer with strong anti-sagging performance, and the initial proportion of its raw materials is: Component A: Epoxy resin: 8%, zinc powder: 64%, dispersant: 1%, organic bentonite: 1%; Component B: fumed silica: 0.5%, curing agent: 25%, other additives: 0.5%; The proportion of each raw material corresponding to the sample performance is: Component A: Epoxy resin: 8.04%, zinc powder: 64.3%, dispersant: 1.005%, organic bentonite: 0.5%; Component B: fumed silica: 0.502%, curing agent: 26.12%, other additives: 0.502%; In summary, by calculating the difference, it can be concluded that if the content of organic bentonite in component A among the above raw materials is lower than the initial proportion, the compensatory addition amount of organic bentonite is obtained according to the calculation, and then the compensatory addition amount of the organic bentonite is controlled by the central control system, so that the addition ratio of each raw material in the water-based epoxy zinc-rich primer is consistent with the initial ratio, thereby preparing a water-based epoxy zinc-rich primer with required performance; it is worth noting that due to the inaccuracy of the flowmeter, the flowmeter needs to be calibrated and maintained before controlling the compensatory addition amount of each raw material.

[0034] In one embodiment, based on the raw material addition ratio-performance reference table, a correlation model between the raw material addition ratio and the performance test results is established by: Collect the amount and proportion of each raw material added during the preparation of the primer and the corresponding performance test results, i.e., the raw material addition proportion-performance reference table; Clean and pre-process the collected raw material addition amount, addition ratio and corresponding performance test results; Establish a correlation model between raw material addition amount, addition ratio and performance test results based on machine learning model; Extract key raw material characteristics that affect performance based on correlation analysis; Divide historical data into training sets and test sets, which are used to train and test association models respectively; The accuracy and generalization ability of the association model were evaluated by cross-validation method; Based on the performance requirements, the association model is used to predict the amount of each raw material added during the automatic batching process.

[0035] For the obtained raw material addition ratio-performance reference table, in one embodiment of the present invention, a correlation model can also be constructed based on the raw material addition ratio-performance reference table. By acquiring historical data, i.e., the raw material addition ratio-performance reference table, a correlation model is established using a machine learning model, and correlation analysis is used to obtain the correlation between the primer performance and the key raw material characteristics, thereby predicting the correlation between the performance and the amount of each raw material added. For primers with specific performance requirements, the performance requirements can be input and the primer formula structure can be predicted using the correlation model, thereby preparing the primer with the required performance requirements; If it is necessary to prepare a water-based epoxy zinc-rich primer with strong anti-sagging performance, and the specific anti-sagging performance needs to reach 500μm, then according to the recorded addition ratio-performance table of each raw material, the addition ratio of each raw material corresponding to the water-based epoxy zinc-rich primer with an anti-sagging performance of 500μm can be obtained, and then according to the required volume of the primer, the addition amount of each raw material can be obtained, thereby preparing the water-based epoxy zinc-rich primer with the required anti-sagging performance.

[0036] In one embodiment, when any of the monitored values ​​of the added amounts of component A and component B is inconsistent with a preset value, an alarm signal is output and the first valve between the batching chamber and the mixing chamber is kept closed.

[0037] Based on the above, by establishing a feedback mechanism, it can be used to monitor whether the amount of raw material added is consistent with the preset value. When the monitored value of the amount of raw material added is inconsistent with the preset value, it means that there is an error in the amount of each raw material added, and the performance of the prepared primer will also be unstable. Therefore, when the monitored value of the amount of raw material added is inconsistent with the preset value, an alarm signal is output, and the central control system receives the alarm signal, determines that there is a fault based on the alarm signal, and closes the first valve to prevent component A and component B from being mixed according to the preset mass ratio, which in turn causes the prepared primer to have unstable performance.

[0038] In one embodiment, after the central control system controls the second valve between the mixing chamber and the material outlet to open, the batching chamber and the mixing chamber are cleaned, and a cleaning signal is output when the cleaning is started; the central control system receives the cleaning signal and maintains the first valve between the batching chamber and the mixing chamber open; The cleaning of the batching chamber and the mixing chamber also includes confirming the end of discharging, outputting a cleaning instruction, and starting cleaning; the confirmation of the end of discharging is the end of discharging, and outputting a completion signal; the outputting of the cleaning instruction is the central control system receiving the completion signal and outputting the cleaning instruction; the starting cleaning is receiving the cleaning instruction and starting cleaning according to the cleaning instruction.

[0039] It is worth noting that after the preparation of the primer is completed, in order to avoid omissions of the previously prepared primer components, resulting in complex components in the mixing chamber and the batching chamber, and at the same time avoid affecting the performance stability of the subsequent primer, the mixing chamber and the batching chamber need to be cleaned; in one embodiment of the present invention, the batching chamber and the mixing chamber are cleaned, and a cleaning signal will be output when the cleaning is started, indicating that it is running. At this time, the central control system will maintain the first valve between the batching chamber and the mixing chamber open, so as to achieve rapid cleaning of the batching chamber and the mixing chamber, and avoid the need to output a signal to control the opening of the first valve due to the closure of the first valve, thereby improving efficiency; in addition, in order to further improve the efficiency of primer preparation, when the primer preparation is completed and the discharge is completed, when the primer discharge is completed, a completion signal will be output, and the central control system will output a cleaning instruction according to the completion signal. Based on the cleaning instruction, it will control the start of cleaning and achieve the cleaning of the batching chamber and the mixing chamber, wherein the judgment of the end of the primer discharge is specifically obtained based on the flow meter at the discharge port.

[0040] In one embodiment, the preparation command includes the addition ratio of the raw materials of the primer and the addition amount of the raw materials, and also includes the temperature of the mixing chamber and the mixing time when preparing the primer; The performance tests include mechanical properties and corrosion resistance tests; wherein the mechanical properties include adhesion, impact resistance, wear resistance and anti-sagging performance; the corrosion resistance includes salt spray, liquid medium resistance, moisture and heat resistance, chemical resistance, electrochemical resistance and long-term exposure performance.

[0041] Working principle: According to the information carried in the preparation command, the amount of raw materials added is accurately controlled, and according to the preparation process, each raw material is divided into component A and component B for pre-mixing; and the pre-mixed component A and component B are respectively completed in different batching chambers. After the preparation of component A and component B is completed, wait for feedback, that is, wait for the monitoring of the amount of component A and component B added, and obtain the monitoring value of each raw material, where the monitoring value mainly depends on the flow meter. When the verification passes, it means that the amount of each raw material added is consistent with the preset value of the amount of each raw material carried in the preparation command. At this time, the central control system controls the first valve to open in sequence, so that the prepared component A and component B enter the mixing chamber one after another. When component A and component B enter the mixing chamber, the central control system controls component A and component B to be evenly mixed in the mixing chamber to obtain a primer.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preparing a waterborne epoxy zinc-rich primer, characterized in that: include: Raw material selection and preparation, dividing the raw materials into component A and component B and mixing them separately; Based on the preparation command, control the amount of each raw material added; Preparation and mixing: after the preparation is completed, the component A and the component B are mixed according to a preset mass ratio to obtain a primer; Performance test: the prepared primer is subjected to performance test. When the performance test is passed, the preparation is completed; Among them, controlling the amount of each raw material added also includes: Monitor and record the amount of each raw material added to obtain the monitoring value of the amount of each raw material added; The monitoring value of the added amount of each raw material is verified. When the monitoring value of the added amount of each raw material is consistent with the preset value, the verification is passed, and the first valve between the batching chamber and the mixing chamber is opened in sequence to allow component A and component B to enter the mixing chamber in sequence; Wherein, a double batching chamber is provided, and component A and component B are batched in separate batching chambers respectively.

2. A method for preparing a waterborne epoxy zinc-rich primer according to claim 1, characterized in that: The method of sequentially opening the valves to allow component A and component B to sequentially enter the mixing chamber also includes: First, a first valve between a batching chamber and a mixing chamber is opened, and component A or component B enters the mixing chamber; Pre-regulating the temperature of the mixing chamber; Monitoring the temperature of the mixing chamber based on a temperature sensor until the temperature of the mixing chamber reaches a preset temperature and then maintains it; When the temperature of the mixing chamber reaches the preset temperature, a mixing signal is output; The central control system receives a mixable signal and then opens the first valve between another batching chamber and the mixing chamber, and component B or component A enters the mixing chamber and is fully mixed to prepare a primer.

3. A method for preparing a waterborne epoxy zinc-rich primer according to claim 2, characterized in that: The method of sequentially opening the valves to allow component A and component B to sequentially enter the mixing chamber also includes: The proportion and amount of raw materials added are input into the mathematical model to predict the time point of VOC generation and the duration of VOC after the A component and B component are mixed; According to the VOC generation time point, the exhaust valve is automatically opened to exhaust; According to the duration of VOC, the exhaust valve is kept open during the VOC generation cycle; The predicted VOC generation time point and duration also includes: Collect historical data, including the proportion and amount of raw materials added, the amount of VOC generated, and the mixing time that affects the generation and volatilization rate of VOCs; Processing of historical data; Based on the processed historical data, a mathematical model of VOC generation and volatilization process is established; Predict VOC production time and duration based on mathematical models.

4. A method for preparing a waterborne epoxy zinc-rich primer according to claim 2, characterized in that: The performance test of the prepared primer also includes: Obtaining a sample from the prepared primer; Export samples for performance testing and obtain test reports; When the test passes, the central control system controls the second valve between the mixing chamber and the discharge port to open; when the test fails, a prompt signal is output to the central control system to keep the second valve between the mixing chamber and the discharge port closed.

5. A method for preparing a waterborne epoxy zinc-rich primer according to claim 4, characterized in that: Outputting the sample for performance testing and obtaining a test report also includes: Based on the test reports of the samples collected in the database, the database is also used to obtain the amount and proportion of each raw material added that matches the sample; Prepare a raw material addition ratio-performance reference table based on the obtained raw material addition amount, addition ratio and corresponding test reports; The test report includes performance information of the sample test.

6. A method for preparing a waterborne epoxy zinc-rich primer according to claim 5, characterized in that: When the sample test fails, the raw material addition ratio corresponding to the performance of the sample test is obtained according to the raw material addition ratio-performance reference table; According to the initial proportion of the added amount of each raw material, the compensation added amount of any raw material is calculated, and a compensation batching signal is output; The central control system controls the amount of compensation added for each raw material based on the compensation batching signal; After the preparation is completed, the sample is obtained again, and the performance test of the sample is carried out and the test report is output until the performance test of the sample passes.

7. A method for preparing a waterborne epoxy zinc-rich primer according to claim 6, characterized in that: Based on the raw material addition ratio-performance reference table, a correlation model between the raw material addition ratio and the performance test results is established by: Collect the amount and proportion of each raw material added during the preparation of the primer and the corresponding performance test results, i.e., the raw material addition proportion-performance reference table; Clean and pre-process the collected raw material addition amount, addition ratio and corresponding performance test results; Establish a correlation model between raw material addition amount, addition ratio and performance test results based on machine learning model; Extract key raw material characteristics that affect performance based on correlation analysis; Divide historical data into training sets and test sets, which are used to train and test association models respectively; The accuracy and generalization ability of the association model were evaluated by cross-validation method; Based on the performance requirements, the association model is used to predict the amount of each raw material added during the automatic batching process.

8. A method for preparing a waterborne epoxy zinc-rich primer according to claim 1, characterized in that: When any of the monitored values ​​of the added amounts of component A and component B is inconsistent with the preset value, an alarm signal is output and the first valve between the batching chamber and the mixing chamber is kept closed.

9. The method for preparing a waterborne epoxy zinc-rich primer according to claim 4, characterized in that: When the central control system controls the second valve between the mixing chamber and the material outlet to open, the batching chamber and the mixing chamber are cleaned, and a cleaning signal is output when the cleaning is started; the central control system receives the cleaning signal and maintains the first valve between the batching chamber and the mixing chamber open; The cleaning of the batching chamber and the mixing chamber also includes: When the material is discharged, the completion signal is output; The central control system receives the completion signal and outputs the cleaning instruction; Receive cleaning instructions and start cleaning according to the cleaning instructions.

10. The method for preparing a waterborne epoxy zinc-rich primer according to claim 5, characterized in that: The preparation command includes the addition ratio and amount of the raw materials of the primer, and also includes the temperature of the mixing chamber and the mixing time during the preparation of the primer; The performance tests include mechanical properties and corrosion resistance tests; wherein the mechanical properties include adhesion, impact resistance, wear resistance and anti-sagging performance; the corrosion resistance includes salt spray, liquid medium resistance, moisture and heat resistance, chemical resistance, electrochemical resistance and long-term exposure performance.

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