Preparation method of polyurethane conformal coating

Abstract

The invention relates to the technical field of coating preparation, and provides a polyurethane conformal coating preparation method which comprises the following steps: S1, inputting requirements of a conformal coating product and used environmental conditions into a weighing module by an operator, and triggering the weighing module to automatically adjust the ratio of raw materials; s2, sequentially adding the weighed polyurethane resin, curing agent, diluent and assistant into a mixing module, mixing to form a mixed raw material, and collecting state data in the mixing process; s3, obtaining the state data through an evaluation module, and carrying out the evaluation to form an evaluation result; s4, if the mixing qualified threshold value is met, heating the mixed raw material through a heating module; s5, transferring the heated mixed raw material into a reaction kettle to form a reaction raw material; s6, rapidly cooling the reaction raw materials to room temperature, and removing impurities to obtain a conformal coating mother solution; and S7, adding the pretreated nano filler into the mother liquor of the conformal coating, and adding a multi-interface reinforcing agent to form a conformal coating product.

Description

Technical Field

[0001] The invention relates to the technical field of coating preparation, and in particular to a method for preparing polyurethane three-proof paint. Background Art

[0002] The electronics industry often refers to the product's moisture-proof, salt spray-proof, and mildew-proof technologies as "three-proof" technologies, so the circuit board protective layer is often called "three-proof paint." Three-proof paint (Conformal Coating) is a specially formulated coating that has good high and low temperature resistance, as well as superior insulation, moisture-proof, leakage-proof, shock-proof, dust-proof, corrosion-proof, anti-aging and corona-resistant properties.

[0003] For example, Chinese patent CN110128933B discloses a polyurethane conformal coating and a preparation method thereof. Although a specific preparation method is given, there is a lack of quality monitoring and evaluation during the preparation process, which is not conducive to the precise control of the quality of the polyurethane conformal coating and is very likely to cause waste of materials.

[0004] In addition, the existing technology has the following main problems in the preparation process of polyurethane three-proof paint:

[0005] 1. In the traditional polyurethane conformal coating preparation process, the control of reaction conditions mainly depends on the operator's experience, and key parameters such as reaction temperature, time and stirring speed are often difficult to accurately control. At the same time, the existing reaction control system is usually set with fixed parameters, lacks the ability to dynamically adjust, and is difficult to cope with changes in raw material batches or fluctuations in environmental conditions. This situation can easily lead to incomplete or over-reaction, thus affecting the performance of the final product.

[0006] 2. The existing technologies mostly use mechanical stirring methods, which are insufficient in terms of dispersion efficiency and uniformity and cannot completely solve the agglomeration problem of nanofillers, resulting in the coating performance being difficult to achieve as expected.

[0007] 3. Traditional polyurethane conformal coatings mostly rely on the chemical properties of the resin itself to combine with the substrate, lack effective interface enhancement technology, and cannot significantly improve the adhesion and durability of the coating, especially in extreme environments.

[0008] 4. The heating equipment used in traditional processes (such as electric heating, oil bath, etc.) is not efficient and it is difficult to achieve precise heat management. In addition, the lack of heat recovery and reuse mechanism leads to low energy utilization of the entire preparation process, which does not meet the current environmental protection requirements of energy conservation and emission reduction.

[0009] The present invention is made to solve the common problems in this field such as the inability to accurately control quality, lack of quality assessment means, uneven dispersion during the stirring process, lack of interface enhancement technology between raw materials and the degree of intelligence, etc. Summary of the invention

[0010] The purpose of the present invention is to propose a method for preparing a polyurethane three-proof paint in view of the current shortcomings.

[0011] In order to overcome the shortcomings of the prior art, the present invention adopts the following technical solutions:

[0012] A method for preparing a polyurethane conformal coating, comprising the following steps:

[0013] S1. The operator sets the requirements for conformal coating products and the environmental conditions used, and inputs them into the weighing module, thereby triggering the weighing module to automatically adjust the ratio of raw materials, which include polyurethane resin, curing agent, diluent, additives and nano-scale fillers;

[0014] S2, adding the weighed polyurethane resin, curing agent, diluent, and auxiliary agent to the mixing module in sequence, starting low-speed mixing, and gradually increasing the stirring speed to allow the raw materials to be fully mixed to form a mixed raw material, and collecting state data of the mixed raw materials during the mixing process through a monitoring module;

[0015] S3, obtaining the state data collected by the monitoring module through the evaluation module, and evaluating the mixed state to form an evaluation result;

[0016] S4. If the evaluation result meets the mixing qualified threshold range, heating the mixed raw materials in the mixing process by a heating module;

[0017] S5, transferring the heated mixed raw materials to a reactor to form a reaction raw material, performing a polymerization reaction on the reaction raw material at a temperature of 60 to 80° C. for 2 to 4 hours, and continuously performing an auxiliary reaction on the reactor through a microwave auxiliary heating module to accelerate the polymerization process, while coordinating with a control module to adjust the reaction conditions in real time;

[0018] S6. After the reaction is completed, stop heating, start the cooling and filtering module, quickly cool the reaction raw materials to room temperature, and use the cooling and filtering module to remove impurities to obtain a clear and transparent conformal coating mother liquor;

[0019] S7, placing the nano-scale filler in a plasma treatment module, and performing surface pretreatment under a low temperature and low pressure environment to form active groups so that the surface of the nano-scale filler is compatible with the polyurethane matrix;

[0020] S8. Add the pretreated nanofiller into the conformal coating mother solution, disperse it through an ultrasonic auxiliary module, and add multiple interface enhancers to form a conformal coating product.

[0021] In addition, the present invention provides a polyurethane three-proof paint preparation system, which includes a server, a weighing module, a mixing module, a monitoring module, an evaluation module, a heating module, a microwave auxiliary heating module, a control module, a cooling and filtering module, a plasma processing module, and an ultrasonic auxiliary module, and the server is respectively connected to the weighing module, the mixing module, the monitoring module, the evaluation module, the heating module, the microwave auxiliary heating module, the control module, the cooling and filtering module, the plasma processing module, and the ultrasonic auxiliary module;

[0022] Among them, the weighing module allows the operator to input the requirements of the three-proof paint product and the environmental conditions used, and triggers the analysis of the raw materials to form a ratio result, so as to weigh the raw materials according to the retracted ratio result, the mixing module mixes the weighed and ratioed raw materials, the monitoring module collects the state data of the raw materials in the mixing module, the evaluation module evaluates the mixing state according to the state data collected by the monitoring module to form an evaluation result, the heating module heats the mixed raw materials that meet the mixed qualified threshold, the microwave auxiliary heating module performs microwave-assisted heating on the mixed raw materials, the control module collects the process data of the heating process of the mixed raw materials, and analyzes according to the process data to form an analysis result, and controls the heating module and the microwave auxiliary heating module according to the analysis result, the cooling and filtering module cools and filters the heated mixed raw materials, the plasma processing module processes the nano-scale filler, and transports the pretreated nano-filler to the ultrasonic auxiliary module, the ultrasonic auxiliary module adds the pretreated nano-filler to the three-proof paint mother liquor and performs a dispersion operation, and adds multiple interface enhancers to form a three-proof paint product.

[0023] Optionally, the weighing module includes an interactive unit, a raw material mixing unit and a weighing unit, the interactive unit allows the operator to set and submit the requirements of the three-proof paint product and the environmental conditions used, the raw material mixing unit mixes the raw materials to form a ratio result according to the requirements of the three-proof paint product and the environmental conditions used collected by the interactive unit, and the weighing unit weighs the raw materials separately according to the ratio result.

[0024] Optionally, the mixing module includes a mixing tank, a mixing unit and a position adjustment unit, the mixing tank is used to place the weighed raw materials, the mixing unit performs a mixing operation on the raw materials in the mixing tank, and the position adjustment unit adjusts the position of the mixing unit so that the raw materials put into the mixing tank can be fully mixed to form mixed raw materials;

[0025] The mixing unit and the position adjustment unit are arranged in the mixing tank, and the raw materials in the mixing tank are put into the mixing tank for mixing operation.

[0026] Optionally, the monitoring module includes a monitoring unit and a data storage device, wherein the monitoring unit is used to collect state data of the mixing process of the mixed raw materials, and the data storage device stores the state data of the mixing process of the mixed raw materials collected by the monitoring unit;

[0027] Wherein, the monitoring unit is arranged in the mixing tank, and the monitoring unit includes an online rotational viscometer, an infrared temperature sensor, and a torque sensor. The online rotational viscometer is used to measure the viscosity data of the raw material, the infrared temperature sensor is used to collect the temperature data of the raw material, and the torque sensor measures the torque change of the stirring shaft of the mixing unit to evaluate the shear force data of the mixture.

[0028] Optionally, the evaluation module obtains the state data collected by the monitoring module, and calculates the mixed state index MIX according to the following formula:

[0029]

[0030] Wherein, η is the dynamic viscosity of the current mixture, η0 is the reference viscosity set by the system, τ is the shear force applied to the current mixture during stirring, τ0 is the shear force set by the system, T is the temperature of the current mixture, and T0 is the reference temperature set by the system;

[0031] If the mixing state index MIX does not fall within the system-set mixing qualified threshold range [MIXthreshold1, MIXthreshold2], the mixed raw materials are allowed to enter the next step of operation.

[0032] Optionally, the heating module includes a heating chamber, a heating element and a heating control unit. The heating chamber is arranged in the inner wall of the mixing tank. The heating element is arranged in the heating chamber and spirally rises along the length direction of the heating chamber and surrounds the inner wall of the mixing tank. The heating control unit controls the heating temperature of the heating element.

[0033] Optionally, the microwave auxiliary heating module includes a lifting unit, a microwave unit and a cooling unit, the lifting unit adjusts the positions of the microwave unit and the cooling unit, the microwave unit assists in heating the mixed raw materials, and the cooling unit cools the microwave unit.

[0034] Optionally, the control module includes a sampling unit, an analysis unit and a control unit, the sampling unit collects process data in the reactor, the analysis unit analyzes the reaction process in the reactor according to the process data collected by the sampling unit to form an analysis result, and the control unit controls the heating module and the microwave auxiliary heating module according to the analysis result;

[0035] The process data include temperature, pressure, and viscosity data of reactants in the reactor.

[0036] Optionally, the cooling and filtering module includes a cooling unit and a filtering unit, the cooling unit receives the reaction raw materials that have reacted in the reactor and cools the reaction raw materials, and the filtering unit filters the reaction raw materials after the cooling operation to filter out impurities in the reaction raw materials to obtain a mother liquor of triple-proof paint.

[0037] The beneficial effects achieved by the present invention are:

[0038] 1. Through the cooperation between the monitoring module and the evaluation module, the production efficiency is improved, the dependence on manual experience is reduced, and the entire system is ensured to have the advantages of high quality evaluation accuracy, low manual dependence, high intelligence and good product quality;

[0039] 2. Through the cooperation of microwave auxiliary heating module, heating module and control module, the mixed raw materials undergo polymerization reaction in the reactor. The microwave auxiliary heating module continuously provides auxiliary heating to accelerate the polymerization process, ensuring that the entire system has the advantages of rapid polymerization, precise control and high intelligence;

[0040] 3. After the nano-scale filler is treated by the plasma treatment module, the dispersibility, mechanical strength, adhesion, chemical corrosion resistance, weather resistance and other functional properties of the three-conformal paint product are improved, and the three-conformal paint coating is improved to perform well in a wider range of application fields, and can provide stronger protection and longer service life for the substrate;

[0041] 4. The ultrasonic auxiliary module is used to assist in the dispersion of the conformal coating masterbatch, nanofiller, and multiple interface enhancers, effectively ensuring that the entire system has the advantages of enhanced interface bonding, coating uniformity, long-term stability, weather resistance, aging resistance, and chemical corrosion resistance;

[0042] 5. The raw materials are accurately weighed through the weighing module to ensure that the product meets the requirements of specific applications, ensuring that the entire system has the advantages of high flexibility in personalized needs, strong adjustment capabilities for diversified product requirements, precise weighing of proportions, less human intervention errors and high intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention can be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily drawn to scale, but the emphasis is placed on illustrating the principles of the embodiments. In different views, the same reference numerals designate the same parts.

[0044] Figure 1 It is a schematic block diagram of the preparation method of the present invention.

[0045] Figure 2 It is an overall block diagram of the present invention.

[0046] Figure 3 It is a block diagram of the operator, interactive unit, raw material preparation unit, weighing unit, mixing module and reactor of the present invention.

[0047] Figure 4 It is a schematic diagram of the evaluation process of the status monitoring module and the evaluation module of the present invention.

[0048] Figure 5 It is a partial cross-sectional schematic diagram of the mixing tank, mixing module, ultrasonic auxiliary module and heating module of the present invention.

[0049] Figure 6 for Figure 5 A magnified schematic diagram of center A.

[0050] Figure 7 It is a partial cross-sectional schematic diagram of the microwave auxiliary heating module, the heating module and the monitoring module of the present invention.

[0051] Figure 8 It is a partial cross-sectional schematic diagram of the cooling and filtering module of the present invention.

[0052] Fig. 9 It is a partial cross-sectional schematic diagram of the ultrasonic auxiliary module of the present invention.

[0053] Fig.10 for Fig. 9 A magnified schematic diagram of point B in the middle.

[0054] Fig.11 for Fig. 9 Schematic cross-sectional view at CC in the middle.

[0055] Fig.12 It is a partial cross-sectional schematic diagram of a plasma processing module of the present invention.

[0056] Explanation of the reference numerals: 1. mixing tank; 2. adjusting rod; 3. limit seat; 4. lifting rod; 5. microwave unit; 6. temperature controller; 7. weighing plate; 8. delivery plate; 9. weighing sensor; 10. weighing chamber; 11. α electronic control valve; 12. sealing valve; 13. action rod; 14. delivery chamber; 15. infrared temperature sensor; 16. torque sensor; 17. mixing rod; 18. online rotation viscometer; 19. discharge pipe; 20. reactor; 21. α pressure sensor; 22. cooling water pipeline; 23. sampling rod; 24. viscometer; 25. filter; 26. γ temperature sensor; 27. heating chamber; 28. heating element; 29. ​​connecting pipe; 30. cooling chamber; 31. heat exchanger; 32. cooling water pipeline; 33. cooling sub-chamber; 34. cooling water pump; 35. connecting pipeline; 36, supercharger; 37, gamma pressure sensor; 38, filter chamber; 39, conformal coating mother liquid; 40, ion chamber; 41, plasma generator; 42, water delivery tank; 43, water delivery valve; 44, water delivery pipe; 45, mass flow controller; 46, valve; 47, gas cylinder; 48, pipeline; 49, vacuum pump; 50, heater; 51, placement seat; 52, stirring part; 53, synthesis chamber; 54, stirring rod; 55, ultrasonic transducer; 56, circulation pipeline; 57, circulation pump; 58, first rotating seat; 59, second rotating seat; 60, storage tank; 61, liquid storage tank; 62, injection pipeline; 63, metering pump; 64, rotating track; 65, circulation pipeline; 66, circulation control valve; 67, rotating seat; 68, rotation drive mechanism; 69, connecting rod; 70, light emitter. DETAILED DESCRIPTION

[0057] The following is an explanation of the embodiments of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted according to actual sizes. It is stated in advance. The following embodiments will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention.

[0058] Embodiment 1: According to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 and Fig.12As shown, this embodiment provides a method for preparing a polyurethane conformal coating, and the method for preparing a polyurethane conformal coating comprises the following steps:

[0059] S1. The operator sets the requirements for conformal coating products and the environmental conditions used, and inputs them into the weighing module, thereby triggering the weighing module to automatically adjust the ratio of raw materials, which include polyurethane resin, curing agent, diluent, additives and nano-scale fillers;

[0060] Among them, polyurethane resin is produced by the reaction of diisocyanate (such as diphenylmethane diisocyanate, MDI) and polyol (such as polyether polyol or polyester polyol);

[0061] Curing agents include: isocyanate curing agents, such as polyisocyanates or blocked isocyanates. Isocyanate groups react with hydroxyl groups in the polyurethane resin to form a cross-linked structure and cure the coating;

[0062] Diluents include commonly used organic solvents such as butyl acetate, xylene or cyclohexanone, which are used to adjust the viscosity of polyurethane conformal coatings to facilitate construction and coating. At the same time, the choice of diluent depends on the required evaporation rate, solubility and appearance of the final coating. Solvents with faster evaporation rates help the coating to form a film quickly, but may affect the flatness; solvents with slower evaporation rates help improve the flatness and gloss of the coating;

[0063] The additives include various functional additives, such as antioxidants, mildew inhibitors, leveling agents, defoamers, ultraviolet absorbers, etc., which are used to improve coating performance;

[0064] S2, adding the weighed polyurethane resin, curing agent, diluent, and auxiliary agent to the mixing module in sequence, starting to mix at a first speed, and gradually increasing the stirring speed to allow the raw materials to be fully mixed to form a mixed raw material, and collecting state data of the mixed raw materials during the mixing process through a monitoring module;

[0065] Wherein, the first speed setting range is: 50 to 200 revolutions per minute (RPM).

[0066] S3, obtaining the state data collected by the monitoring module through the evaluation module, and evaluating the mixed state to form an evaluation result;

[0067] S4. If the evaluation result meets the mixing qualified threshold range, heating the mixed raw materials in the mixing process by a heating module;

[0068] During the mixing process, the mixed raw materials are preheated to 50-60° C. using a heating module, and then the microwave auxiliary heating module is started to quickly raise the temperature to 60-80° C. The mixing and heating state is maintained for 15-30 minutes to ensure that the mixed raw materials are fully reacted and activated;

[0069] S5, transferring the heated mixed raw materials to the reactor 20, performing a polymerization reaction at a temperature of 60-80° C. for 2-4 hours, and continuously performing auxiliary reaction on the reactor 20 through a microwave auxiliary heating module to accelerate the polymerization process, while coordinating with the control module to adjust the reaction conditions in real time;

[0070] The heated mixed raw materials are transferred to the reactor 20, and a polyurethane matrix is ​​generated after a polymerization reaction at a temperature of 60 to 80°C.

[0071] S6. After the reaction is completed, stop heating, start the cooling and filtering module, quickly cool the reactants to room temperature, and use the cooling and filtering module to remove impurities to obtain a clear and transparent conformal coating mother solution 39;

[0072] S7, placing the nano-scale filler in a plasma treatment module, and performing surface pretreatment under a low temperature and low pressure environment to form active groups so that the surface of the nano-scale filler is compatible with the polyurethane matrix;

[0073] S8, adding the pretreated nanofiller to the conformal coating master solution 39, dispersing it through an ultrasonic auxiliary module, and adding multiple interface enhancers to form a conformal coating product to improve the bonding force between the filler and the substrate and the coating performance;

[0074] In addition, the present invention provides a polyurethane three-proof paint preparation system, which includes a server, a reactor 20, a weighing module, a mixing module, a monitoring module, an evaluation module, a heating module, a microwave auxiliary heating module, a control module, a cooling and filtering module, a plasma processing module, and an ultrasonic auxiliary module. The server is respectively connected to the weighing module, the mixing module, the monitoring module, the evaluation module, the heating module, the microwave auxiliary heating module, the control module, the cooling and filtering module, the plasma processing module, and the ultrasonic auxiliary module, and the intermediate data and process data of the weighing module, the mixing module, the monitoring module, the evaluation module, the heating module, the microwave auxiliary heating module, the control module, the cooling and filtering module, the plasma processing module, and the ultrasonic auxiliary module are stored in the database of the server for query or call;

[0075] The weighing module allows the operator to input the requirements of the conformal coating product and the environmental conditions used, and triggers the analysis of the raw materials to form a ratio result, so as to weigh the raw materials according to the retracted ratio result, the mixing module mixes the weighed and ratioed raw materials, the monitoring module collects the state data of the raw materials in the mixing module, the evaluation module evaluates the mixing state according to the state data collected by the monitoring module to form an evaluation result, the heating module heats the mixed raw materials that meet the qualified mixing threshold, the microwave auxiliary heating module performs microwave auxiliary heating on the mixed raw materials, the control module collects the process data of the heating process of the mixed raw materials, and analyzes according to the process data to form an analysis result, and controls the heating module and the microwave auxiliary heating module according to the analysis result, the cooling and filtering module cools and filters the heated mixed raw materials, the plasma processing module processes the nano-scale filler, and transports the pretreated nano-filler to the ultrasonic auxiliary module, the ultrasonic auxiliary module adds the pretreated nano-filler to the conformal coating mother solution 39 and performs a dispersion operation, and adds multiple interface enhancers to form a conformal coating product;

[0076] The polyurethane conformal coating preparation system also includes a central processing unit, which is respectively connected to the server, weighing module, mixing module, monitoring module, evaluation module, heating module, microwave auxiliary heating module, control module, cooling and filtering module, plasma processing module, and ultrasonic auxiliary module, and is centrally controlled based on the central processing unit to control the weighing module, mixing module, monitoring module, evaluation module, heating module, microwave auxiliary heating module, control module, cooling and filtering module, plasma processing module, and ultrasonic auxiliary module, and the control data of the central processing unit is stored in the server to improve the reliability and preparation efficiency of the entire preparation system;

[0077] Optionally, the weighing module includes an interaction unit, a raw material mixing unit and a weighing unit, wherein the interaction unit allows the operator to set and submit the requirements of the conformal coating product and the environmental conditions used, the raw material mixing unit mixes the raw materials according to the requirements of the conformal coating product and the environmental conditions used collected by the interaction unit to form a ratio result, and the weighing unit weighs the raw materials respectively according to the ratio result;

[0078] The interactive unit includes a touch screen, an executable program, a trigger button, and an identity recognition device, wherein the identity recognition device is used to verify the identity of the operator. After the identity recognition device passes the verification, the operator is allowed to input the requirements of the three-conformal paint product and the environmental conditions used on the touch screen. The executable level is executed on the touch screen to form a human-computer interaction interface, and the operator is allowed to input the requirements of the three-conformal paint product and the environmental conditions used. The trigger button is used by the operator to submit the input requirements of the three-conformal paint product and the environmental conditions used;

[0079] The identity recognition device includes identity recognition and fingerprint recognition, that is, by collecting the identity information and fingerprint information of the operator and comparing them with the data stored in the database, if the comparison result is consistent, the verification is passed, otherwise, the verification fails;

[0080] When the trigger button is triggered, the requirements of the conformal coating product and the environmental conditions used input by the operator are transmitted to the raw material preparation unit;

[0081] Wherein, the raw material preparation unit is triggered to prepare the raw materials after receiving the requirements of the conformal coating product and the environmental conditions used input by the operator;

[0082] The requirements of the conformal coating product and the environmental conditions used input by the operator through the human-computer interaction interface include requirement parameters, environmental condition parameters, and raw material characteristic parameters;

[0083] Specifically,

[0084] 1) Required parameters:

[0085] Target viscosity η target The conformal coating viscosity expected by the operator;

[0086] Corrosion resistance C target The highest strength for the product's corrosion resistance;

[0087] Moisture resistance H target The maximum humidity for the product’s moisture resistance;

[0088] Adhesion A target : The target adhesion or minimum adhesion of the conformal coating on the substrate (i.e., the adhesion that meets the actual use requirements);

[0089] 2) Environmental condition parameters:

[0090] Operating temperature T env The ambient temperature in which the conformal coating will be applied;

[0091] Humidity envThe humidity of the environment where the conformal coating will be applied or used;

[0092] 3) Raw material characteristic parameters:

[0093] Polyurethane resin viscosity η resin : Used to indicate the viscosity of polyurethane resin;

[0094] Curing agent concentration C hardener : Used to express the contribution of curing agent concentration to corrosion resistance (i.e., the concentration of curing agent in the mixture);

[0095] Diluent viscosity reduction factor k diluent , used to express the effect of diluent on viscosity reduction;

[0096] Functional parameters of additives P additive : Used to indicate the contribution of additives to moisture resistance, adhesion, etc.;

[0097] Among them, the additive functional parameter P additive The determination mainly depends on experiments and experience, and is specifically determined by the following methods:

[0098] Select the type of additive and clarify the target performance (such as leveling, adhesion, moisture resistance, etc.);

[0099] Set the dosage of additives, and make preliminary settings based on manufacturer recommendations or empirical values;

[0100] Experimental testing of additive effects to quantify the functional contribution of additives at different dosages;

[0101] Establish an experimental model and determine the relationship between additive dosage and P by regression analysis or fitting formula. additive The relationship function of

[0102] Adjust and optimize the dosage of additives, optimize the final dosage of additives according to experiments and models, ensure that its functional parameters reach the optimal value, and then optimize the dosage of additives and P additive The relationship function of derives the final relationship function;

[0103] Nanofiller volume ratio V filler : Used to indicate the volume ratio of nanofillers in the mixture;

[0104] w hardener : Used to indicate the mass ratio of the curing agent, indicating its proportion in the mixture;

[0105] w additive Used to indicate the mass ratio of additives, indicating their proportion in the mixture;

[0106] The raw material preparation unit obtains the demand for the three-proof paint product and the environmental condition data used input by the operator, and calculates the target viscosity η according to the following formula: mix (wherein, target viscosity η mix It is determined by the viscosity of the polyurethane resin, the influence of the curing agent and the dilution effect of the diluent):

[0107] η mix =η resin ·f hardener (C hardener )·(1-k diluent ·V diluent );

[0108] Where η mix is the viscosity of the final mixture (unit: Pa·s), which should satisfy η mix =η target , ηresin is the viscosity of the polyurethane resin, which is a known physical property parameter and is usually obtained directly from the technical data sheet (TDS) provided by the supplier, k diluent is the viscosity reduction factor, f hardener (C hardener ) is the correction factor of the curing agent on the viscosity, which depends on the concentration of the curing agent C hardener and its physicochemical properties, V diluent is the volume ratio of the diluent, which indicates the volume proportion of the diluent in the entire mixture. Specifically, it is the ratio of the volume of the diluent to the volume of the total mixture, where its value is obtained by experiment;

[0109] f hardener (C hardener ) is the correction factor of the curing agent for viscosity and is determined experimentally according to the following steps:

[0110] Prepare a series of samples: with a fixed amount of resin, gradually increase the concentration of curing agent C hardener , for example, from 10% to 30%, each 5% is a concentration point;

[0111] Viscosity measurement: Use a rotational viscometer to measure the viscosity η of each sample. mix (C hardener );

[0112] Calculate the correction factor: For each sample, calculate the viscosity and base resin viscosity η resin (C hardener ) to obtain the correction factor:

[0113]

[0114] Data fitting: Fit the obtained correction factor data into a function fhardener (C hardener ), that is, the concentration of the curing agent C hardener , viscosity η mix and base resin viscosity η resin is the independent variable, and the correction factor f hardener (C hardener ) is a function of the dependent variable. Common fitting forms include linear, quadratic polynomial or exponential function. The function form with the best fitting degree is selected as the expression of the correction factor. Finally, according to the ideal curing agent concentration C hardener , viscosity η mix and base resin viscosity η resin Get specific correction factor data;

[0115] The determination process of the viscosity reduction coefficient is based on experimental data and is obtained by fitting the relationship between the diluent ratio and the viscosity change. The specific steps are:

[0116] 1) The basic steps of the experiment are as follows:

[0117] Prepare multiple samples: Keeping the ratio of other ingredients (such as polyurethane resin and curing agent) constant, prepare a series of samples by gradually increasing the ratio of diluent (V diluent ). For example, from 0% to 30%, increase the diluent volume by 5% or 10% each time.

[0118] Measuring viscosity η mix :Use a rotational viscometer or other viscosity measuring instrument to measure the mixture viscosity η of each sample mix .

[0119] Record data: record diluent volume ratio

[0120] V diluent and the corresponding mixture viscosity η mix Data points.

[0121] 2) According to the formula: η mix =η resin ·f hardener (C hardener )·(1-k diluent ·V diluent );

[0122] Among them, η resin is the viscosity of the base resin (known), f hardener (C hardener ) is the correction factor of curing agent for viscosity, obtained by experimental determination or fitting, k diluent is the viscosity reduction factor to be determined, V diluent is the volume ratio of the diluent.

[0123] 3) Data fitting to determine k diluent :

[0124] In the experiment, we used the diluent ratio V diluent and the mixture viscosity η mix Fitting a curve to the data to determine k diluent .

[0125] Linearize the formula, simplify the fitting process, and define:

[0126] η mix =η resin ·f hardener (C hardener )·(1-k diluent ·V diluent );

[0127] The viscosity correction factor f hardener (C hardener ) and base resin viscosity η resin Considered as a constant, the formula becomes:

[0128]

[0129] Equivalent to: y = 1-k diluent ·V diluent ;

[0130] In the formula, V diluent is the diluent volume ratio. k diluent is the negative value of the slope.

[0131] Specifically, calculate the relative viscosity: For each diluent ratio V diluent , calculate the relative viscosity:

[0132]

[0133] In the formula, f hardener (C hardener ) determined by experiment or known data;

[0134] Fitting a Line: Plotting y versus V diluent Use linear regression to fit this straight line.

[0135] y is the vertical coordinate, V diluent Is the horizontal axis.

[0136] The slope of the straight line obtained by fitting - k diluent It is the viscosity reduction coefficient.

[0137] Determine k diluent :The negative value of the slope of the fitted straight line is the required viscosity reduction coefficient kdiluent .

[0138] In addition, the raw material preparation unit obtains the demand for the three-proof paint product and the environmental condition data used input by the operator, and calculates the corrosion resistance C of the final mixture according to the following formula: mix (Wherein, the corrosion resistance of the final mixture is C mix Mainly affected by curing agent and additives):

[0139] C mix =C hardener ·w hardener +P additive ·w additive

[0140] In the formula, C mix For the corrosion resistance of the final mixture, C mix =C target , w hardener is the mass ratio of the curing agent, indicating its proportion in the mixture, and its value is input by the operator through the human-computer interaction interface. additive is the mass ratio of the additive, indicating its proportion in the mixture, and its value is input by the operator through the human-computer interaction interface;

[0141] At the same time, the raw material preparation unit obtains the demand for the three-proof paint product and the environmental condition data used input by the operator, and calculates the moisture resistance H according to the following formula mix (Among them, moisture resistance H mix Affected by additives and nanofillers):

[0142] H mix =H env ·P additive ·(1+V filler );

[0143] In the formula, H mix The moisture resistance of the mixture is to meet H mix ≥H target , H env The humidity of the use environment is the basis for the moisture resistance requirement. additive is the contribution parameter of the additive to moisture resistance, and its value is input by the operator through the human-computer interaction interface. filler is the volume ratio of the nanofiller, and its value is input by the operator through the human-computer interaction interface;

[0144] In addition, the raw material preparation unit obtains the demand for the three-proof paint product and the environmental condition data used input by the operator, and calculates the adhesion A according to the following formula: mix (The adhesion A mix Determined by additives and curing agents):

[0145] A mix =P additive ·w additive +C hardener ·w hardener ;

[0146] In the formula, A mix For the adhesion of the mixture, A mix ≥A target , P additive is the contribution parameter of the additive to the adhesion, and its value is input by the operator through the human-computer interaction interface. additive is the mass ratio of the additive, indicating its proportion in the mixture, and its value is input by the operator through the human-computer interaction interface. hardener is the influence factor of the curing agent on the adhesion, and its value is input by the operator through the human-computer interaction interface;

[0147] The raw material mixing unit combines the above formulas to obtain the final actual mixing ratio:

[0148]

[0149] Wherein, Resin Ratio is the proportion of polyurethane resin, Vdiluent is the volume ratio of diluent, Vfiller is the volume ratio of nanofiller, Diluent Ratio is the proportion of diluent, Hardener Ratio is the proportion of curing agent, wadditive is the mass ratio of additive, Additive Ratio is the proportion of additive, FillerRatio is the proportion of nanofiller;

[0150] Specifically, Resin Ratio: The proportion of polyurethane resin, which represents the volume ratio of the resin in the mixture, is calculated as 1-V diluent -V filler , that is, the remaining volume is filled with polyurethane resin.

[0151] Diluent Ratio: The proportion of diluent, directly equal to V diluent , is the volume ratio of the diluent in the total mixture.

[0152] Hardener Ratio: The proportion of hardener, equal to the mass ratio of hardener w hardener , reflecting the mass proportion of the curing agent in the entire mixture.

[0153] Additive Ratio: The proportion of additives, equal to the mass ratio of additives w additive, represents the mass ratio of the additive in the mixture.

[0154] Filler Ratio: The proportion of nanofiller, equal to the volume ratio of filler V filler , represents the volume ratio of nanofiller in the total mixture.

[0155] The weighing units are respectively arranged above the feeding ports of the mixing module and the plasma processing module, wherein the weighing units include a weighing component and a feeding component, the feeding component is arranged above the feeding ports of the mixing module and the plasma processing module, and the weighed raw materials are fed into the mixing module and the plasma processing module as required, and the weighing component is fed into the mixing module and the reactor in sequence according to the weight determined by the final actual ratio Final Mix Ratio;

[0156] Specifically, the raw materials except the filler are directly put into the mixing module after being weighed and mixed and reacted to form mixed raw materials, and then the mixed raw materials are transferred to the reactor for polymerization and then cooled and filtered to form a mother solution of the three-proof paint;

[0157] Meanwhile, the filler (or nano-scale filler) is separately placed into the plasma treatment module for pretreatment, and is compatible with the conformal coating mother solution in the subsequent process.

[0158] Specifically, the nano-scale filler (or filler in this embodiment) pre-treated in the plasma treatment module and the conformal coating mother solution are introduced into the synthesis chamber 53 of the ultrasonic auxiliary module for mixing, and multiple interface agents are added (see step S8) to form a conformal coating product.

[0159] Wherein, the weighing member is arranged above the feeding member, and after being weighed by the weighing member, falls above the feeding member, thereby feeding the weighed raw materials into the mixing module and the reactor;

[0160] In this embodiment, the final actual ratio is converted into weight, specifically:

[0161]

[0162] Where W total is the total weight of the final mixture (i.e., Total Batch Weight), which is usually input by the operator or determined according to production requirements. resin is the mass ratio of the resin in the mixture (i.e., the specific weighed weight corresponding to Resin Ratio), R diluent is the mass ratio of the diluent in the mixture (i.e., the specific weighed weight corresponding to the Diluent Ratio), Rhardener is the mass ratio of the curing agent in the mixture (i.e., the specific weighed weight corresponding to HardenerRatio), R additive is the mass ratio of the additive in the mixture (i.e., the specific weighed weight corresponding to Additive Ratio), R filler is the mass ratio of the filler in the mixture (i.e. the specific weighed weight corresponding to Filler Ratio);

[0163] The specific weighing steps of the weighing member include:

[0164] S11. Get input parameters:

[0165] Total weight input: The operator enters the total batch weight W total ;

[0166] Ratio input: The system obtains the ratio of each component according to the formula or operator input: R resin , R diluent , R hardener , R additive , R filler ;

[0167] S12. Calculate the target weight of each raw material:

[0168] Calculation: The weighing component calculates the specific weighing weight W of each raw material through the above formula resin , W diluent , W hardener , W additive , W filler ;

[0169] S13. Weighing

[0170] 1) Resin weighing:

[0171] Start weighing component: weighing component automatically calls W resin The value of

[0172] Resin weighing: The weighing component weighs the resin accurately until it reaches the calculated weight W resin ;

[0173] 2) Weighing of diluent:

[0174] Start weighing component: weighing component calls W diluent The value of

[0175] Diluent weighing: The weighing component accurately weighs the diluent to achieve W diluent weight;

[0176] 3) Weighing of curing agent:

[0177] Start weighing component: weighing component calls W hardener The value of

[0178] Curing agent weighing: The weighing component accurately weighs the curing agent to reach W hardener weight;

[0179] 4) Weighing of additives:

[0180] Start weighing component: weighing component calls W additive The value of

[0181] Weighing of additives: The weighing component accurately weighs the additives to achieve W additive weight;

[0182] 5) Filler weighing:

[0183] Start weighing component: weighing component calls W filler The value of

[0184] Filler weighing: The weighing component weighs the filler accurately to reach W filler weight;

[0185] S14. Raw material input:

[0186] Preparation for delivery: After weighing is completed, the delivery component will prepare the weighed raw materials, arrange them at the delivery position, and wait for delivery in sequence;

[0187] Placed into the synthesis cavity 53 of the mixing module and the ultrasonic auxiliary module:

[0188] Resin delivery: The delivery component delivers the weighed resin W resin Placed in a mixed module;

[0189] Diluent delivery: Subsequently, diluent W diluent was put into the hybrid module;

[0190] Curing agent: Then curing agent W hardener into the mixed module;

[0191] Additive placement: Next, add additive W additive Placed in a mixed module;

[0192] Filler placement: Finally, filler W is placed filler Put into the reactor;

[0193] The delivery component includes a delivery chamber 14, a sealing valve 12, a delivery plate 8, an action rod 13 and an action drive mechanism, wherein the delivery plate 8 is arranged in the delivery chamber 14, and the sealing valve 12 is respectively arranged at the feeding port of the mixing module and the feeding port of the plasma treatment module to block the feeding port, and one end of the delivery plate 8 is hinged with the mixing module and the plasma treatment module to form a hinged portion, and the other end of the delivery plate 8 extends toward a side away from the hinged position, and one end of the action rod 13 is connected to the action drive mechanism to form an action portion, and the action portion is arranged on the inner wall of the delivery chamber 14, and the other end of the action rod 13 is hinged with an end face of one side of the delivery plate 8 away from the hinged position, so that when the action portion is actuated, it can push the action plate to rotate along the axis of the hinged portion and pour from the feeding port into the mixing module and the reactor 20;

[0194] The weighing member includes a weighing chamber 10, an α electronic control valve 11, a weighing sensor 9, a weighing plate 7, and a guide tube. The weighing chamber 10 is used to place the raw materials. The weighing chamber 10 is provided with a feeding port. The α electronic control valve 11 blocks the feeding port to control the raw materials flowing out of the feeding port. The guide tube is arranged at the feeding port and controls the direction of the raw materials flowing out of the weighing chamber 10. The weighing sensor 9 is arranged on the weighing plate 7 to form a weighing part. The weighing part is arranged below the guide tube and receives the raw materials flowing out of the feeding port to weigh the raw materials.

[0195] The weighing part is arranged on the upper end surface of the placing plate 8 to receive the raw materials dropped into the weighing cavity 10;

[0196] When the weighing sensor 9 detects that the current weight is the required weight, the α electronic control valve 11 is controlled to perform a shutoff operation, and the action unit is triggered to put the weighed raw materials into the mixing module and the reactor 20;

[0197] In this embodiment, the polyurethane resin, curing agent, diluent, auxiliary agent and nano-scale filler each independently correspond to a dedicated weighing unit to prevent the cross-influence between the raw materials and the defect of inaccurate quality control;

[0198] The raw materials are accurately weighed through the weighing module to ensure that the products meet the requirements of specific applications, ensuring that the entire system has the advantages of high flexibility for personalized needs, strong ability to adjust to diverse product requirements, accurate weighing of proportions, less human intervention errors and high intelligence;

[0199] Optionally, the mixing module includes a mixing tank 1, a mixing unit and a position adjustment unit, wherein the mixing tank 1 is used to place weighed raw materials, the mixing unit performs a mixing operation on the raw materials in the mixing tank 1, and the position adjustment unit adjusts the position of the mixing unit so that the raw materials put into the mixing tank 1 can be fully mixed to form mixed raw materials;

[0200] Wherein, the mixing unit and the position adjustment unit are arranged in the mixing tank 1, and the raw materials in the mixing tank 1 are put into the mixing tank 1 for mixing operation;

[0201] The mixing unit comprises a mixing rod 17, a mixing drive mechanism, and a support seat, one end of the mixing rod 17 is drivingly connected to the mixing drive mechanism to form a mixing portion, the mixing portion is arranged on the support seat, and the support seat is arranged on the position adjustment unit, and the other end of the mixing rod 17 extends toward a side away from the mixing portion to cooperate with the position adjustment unit to stir the raw materials put into the mixing chamber;

[0202] The position adjustment unit adjusts the position of the support seat so that the mixing rod 17 stirs the raw materials at different positions in the stirring chamber to improve the mixing accuracy and reliability of the raw materials;

[0203] The position adjustment unit includes a limit seat 3, an adjustment cavity arranged on the limit seat 3, an adjustment rod 2, and an adjustment drive mechanism, wherein the adjustment drive mechanism is connected to one end of the adjustment rod 2 to form an adjustment portion, and the other end of the adjustment rod 2 is symmetrically arranged along the outer wall of the support seat, and the telescopic detection member detects the telescopic length of the adjustment rod 2;

[0204] Wherein, the limiting seat 3 is embedded in the outer wall of the supporting seat and connected to the supporting seat;

[0205] When the adjustment drive mechanism drives the adjustment rod 2 to adjust, the position of the support seat is driven, and the position of the mixing part is driven to adjust, so as to achieve stirring and mixing at different positions in the mixing tank 1;

[0206] At the same time, during the adjustment of the adjusting rod 2, the telescopic detection member monitors the telescopic amount of the adjusting rod 2, so that the telescopic amount of the mixing part during the stirring process is ensured to be less than a specified safety amount, so as to ensure that the mixing part does not touch the inner wall of the mixing chamber, so as to ensure the safety and reliability of the entire stirring process;

[0207] Optionally, the monitoring module includes a monitoring unit and a data memory. The monitoring unit is used to collect the state data of the mixing process of the mixed raw materials, and the data memory stores the state data of the mixing process of the mixed raw materials collected by the monitoring unit. Among them, the monitoring unit is arranged in the mixing tank 1. The monitoring unit includes an on-line rotational viscometer 18, an infrared temperature sensor 15, and a torque sensor 16. The on-line rotational viscometer 18 is used to measure the viscosity data of the raw materials, the infrared temperature sensor 15 is used to collect the temperature data of the raw materials, and the torque sensor 16 measures the torque change of the stirring shaft of the mixing unit to evaluate the shear force data of the mixture.

[0208] Among them, the on-line rotational viscometer 18 is arranged on the mixing rod 17, the infrared temperature sensor 15 is arranged on the top wall of the mixing chamber and extends towards the position of the stirring part 52 to detect the temperature mutual data in the mixing chamber, and the torque sensor 16 is arranged on the output shaft of the mixing rod 17 to measure the torque data of the output shaft of the mixing rod 17.

[0209] Optionally, the evaluation module obtains the state data collected by the monitoring module and calculates the mixing state index MIX according to the following formula:

[0210]

[0211] In the formula, η is the dynamic viscosity of the current mixture, η0 is the reference viscosity set by the system, τ is the shear force received by the current mixture during the stirring process, τ0 is the shear force set by the system, T is the temperature of the current mixture, and T0 is the reference temperature set by the system.

[0212] If the mixing state index MIX falls within the system-set mixing qualified threshold range [MIXthreshold1, MIXthreshold2], the mixed raw materials are allowed to enter the next operation.

[0213] If the mixing state index MIX does not fall within the system-set mixing qualified threshold range [MIXthreshold1, MIXthreshold2], it means that the mixing state does not meet the system requirements, and the ratio is readjusted and the mixing operation is continued.

[0214] Specifically, when it is too thin (MIX < MIXthreshold1), the diluent is reduced to increase the viscosity of the mixture.

[0215] When it is too thick (MIX > MIXthreshold2), the diluent is increased to reduce the viscosity of the mixture.

[0216] Among them, the mixed qualified threshold range [MIXthreshold1, MIXthreshold2] set by the system is set by the system according to the actual situation. This is a technical means well known to those skilled in the art. Those skilled in the art can refer to relevant technical manuals to learn about the technology, so it will not be described one by one in this embodiment;

[0217] Through the cooperation between the monitoring module and the evaluation module, the production efficiency is improved, the dependence on manual experience is reduced, and the whole system is ensured to have the advantages of high quality evaluation accuracy, low manual dependence, high intelligence and good product quality;

[0218] Optionally, the heating module includes a heating chamber 27, a heating element 28 and a heating control unit, wherein the heating chamber 27 is arranged in the inner wall of the mixing tank 1, the heating element 28 is arranged in the heating chamber 27, and spirally rises along the length direction of the heating chamber 27 and surrounds the inner wall of the mixing tank, and the heating control unit controls the heating temperature of the heating element 28;

[0219] The heating control unit includes a power supply line and a current controller, wherein the power supply line is electrically connected to the heating element 28, and the current controller controls the current intensity transmitted to the power supply line to control the heating amount of the heating element 28;

[0220] The mixing module further includes a discharge pipe 19 and an electronic regulating valve. One end of the discharge pipe 19 is connected to the bottom wall of the mixing tank 1, and the other end of the discharge pipe 19 is connected to the heating chamber 27, so that the mixed raw materials enter the heating chamber 27.

[0221] The electronic regulating valve is arranged in the discharge pipe 19 and controls the on-off of the discharge pipe 19;

[0222] Optionally, the microwave auxiliary heating module includes a lifting unit, a microwave unit 5 and a cooling unit, the lifting unit adjusts the positions of the microwave unit 5 and the cooling unit, the microwave unit 5 performs auxiliary heating on the mixed raw material, and the cooling unit cools the microwave unit 5;

[0223] The lifting unit includes a lifting rod 4, a lifting detection member and a lifting drive mechanism. One end of the lifting rod 4 is drivingly connected to the lifting drive mechanism to form a lifting portion. The other end of the lifting rod 4 is connected to the microwave unit 5 and the cooling unit to adjust the positions of the microwave unit 5 and the cooling unit. The lifting detection member detects the lifting height of the lifting rod 4 to obtain the extension amount of the lifting rod 4.

[0224] The lifting part is respectively arranged on the top wall of the mixing chamber and the reactor 20, and the lifting height of the lifting rod 4 needs not to affect the mixing action of the mixing part and the reaction process of the reactor 20;

[0225] The microwave unit 5 includes a microwave seat, a microwave generator, a waveguide, a microwave distributor, an α temperature sensor, a microwave leakage detector, and a power controller. The microwave seat is provided with a microwave cavity, and the microwave cavity is used to place the microwave generator, the waveguide, the microwave distributor, the microwave leakage detector, and the power controller. The microwave generator is used to generate microwaves, and the waveguide is used to guide the microwaves from the generator to the cavity where the mixed raw materials and reactants are located. The microwave distributor is responsible for evenly distributing the microwaves entering the cavity to avoid local overheating and ensure uniform heating. The α temperature sensor monitors the temperature in the heating cavity 27 in real time to ensure temperature control during microwave heating and avoid damage to raw materials or equipment caused by overheating. The microwave leakage detector is used to detect whether there is microwave leakage in the microwave system to ensure safe operation. The power controller adjusts the output power of the microwave generator and controls the intensity of the microwave according to the set heating program to achieve precise temperature control.

[0226] Among them, the microwave generator converts electrical energy into high-frequency electromagnetic waves (usually 2.45GHz) through an electron tube (usually a magnetron) to heat the mixed raw materials and reactants;

[0227] Wherein, the temperature reduction unit is arranged in the microwave seat and dissipates the heat generated by the microwave generator and the power controller;

[0228] The temperature reduction unit includes a cooling water pipeline 22, a circulation pump 57, a cooling tower, a β temperature sensor, and a temperature controller 6. The cooling water pipeline 22 is closely attached to the microwave generator and the power controller so as to transmit the heat generated by the microwave generator and the power controller to the cooling tower through the cooling water pipeline 22, thereby realizing the cooling of the heat. The circulation pump 57 is used for circulating the cooling water in the cooling water pipeline 22. The cooling tower is used for dissipating the heat in the cooling water. The β temperature sensor is arranged in the cooling water pipeline 22, and the detected temperature data is fed back to the temperature controller 6. The temperature controller 6 adjusts the water flow rate according to the real-time feedback temperature of the β temperature sensor (adjusts the water flow rate through the circulation pump 57).

[0229] In this embodiment, the water cooling process includes:

[0230] Start cooling: After the microwave heating process is finished, when the temperature controller 6 detects that the temperature of the microwave unit 5 reaches the temperature reduction threshold, the water cooling system starts, and the cooling water starts to circulate in the cooling water pipeline 22;

[0231] Water circulation cooling: cooling water circulates in the cooling jacket or coil by the action of a pump, close to the microwave generator and waveguide, and the water flow takes away the heat emitted by the microwave unit 5 and transfers the heat to the cooling tower or heat exchanger 31;

[0232] Heat exchange and heat rejection: In the cooling tower or heat exchanger 31, the hot water exchanges heat with the ambient air or cooling medium to reduce the water temperature; the cooled water is circulated into the system again to repeat the cooling process;

[0233] Temperature adjustment and stop: The temperature controller 6 adjusts the water flow or the temperature of the cooling water according to the real-time monitored temperature to ensure the cooling effect; when the temperature of the microwave unit 5 drops to a safe range, the water cooling system gradually stops working;

[0234] Optionally, the control module includes a sampling unit, an analysis unit and a control unit, the sampling unit collects process data in the reactor 20, the analysis unit analyzes the reaction process in the reactor 20 according to the process data collected by the sampling unit to form an analysis result, and the control unit controls the heating module and the microwave auxiliary heating module according to the analysis result;

[0235] The process data include temperature, pressure, and viscosity data of reactants in the reactor 20;

[0236] The sampling unit includes a γ temperature sensor 26, an α pressure sensor 21, and a viscosity sampling member. The γ temperature sensor 26 collects temperature data in the reactor 20, the α pressure sensor 21 samples the pressure in the reactor 20, and the viscosity sampling member samples the viscosity of the reaction raw materials in the reactor 20.

[0237] The inner wall of the reactor 20 is provided with a sampling cavity, and the viscosity sampling member is arranged in the sampling cavity. In this embodiment, the arrangement position of the sampling cavity is set to not affect the operation of the polymerization reaction in the reactor 20;

[0238] The viscosity sampling member includes a sampling rod 23 and a viscometer 24. The viscometer 24 is disposed at one end of the sampling rod 23. The other end of the sampling rod 23 is disposed in the inner wall of the sampling cavity and extends toward a side away from the inner wall of the sampling cavity, so as to sample the viscosity of the reaction raw materials in the reactor 20.

[0239] The analysis unit obtains the process data collected by the sampling unit and calculates the heat impact index HII according to the following formula:

[0240]

[0241] In the formula, η'mix is the viscosity of the current reactant, collected in real time from the reactor, η ref is the reference value of viscosity, which is usually the target viscosity determined based on ideal conditions or historical data. mix The current temperature of the reactants is collected in real time from the reactor, T ref is the reference value of temperature, which is usually set according to the ideal reaction conditions or target temperature. mix is the current pressure in the reactor, collected in real time from the reactor, P ref is the reference value of pressure, which is set according to the ideal reaction conditions or target pressure;

[0242] If the heat impact index HII does not fall within the thermal monitoring threshold [range1, range2] set by the system, the control unit is triggered to control the heating module and the microwave auxiliary heating module;

[0243] If the heat impact index HII falls within the thermal monitoring threshold [range1, range2] set by the system, it means that the current reaction of the reactor meets the expectations of the system, and the heating module and the microwave auxiliary heating module do not need to maintain the current state;

[0244] The thermal monitoring threshold [range1, range2] set by the system is set by the system according to the actual situation. This is a technical means well known to those skilled in the art. Those skilled in the art can refer to relevant technical manuals to learn about the technology, so it will not be described in detail in this embodiment.

[0245] The control unit obtains the heat impact index HII and the thermal monitoring threshold [range1, range2] set by the system, and calculates the heat value Qheat(HII) of the heating module under the current heat impact index HII and the heat value Qheat(HII) of the microwave auxiliary heating module under the current heat impact index HII according to the following formulas: microwave (HII):

[0246]

[0247] Where HII is the thermal impact index calculated in real time, range1 is the lower threshold of thermal monitoring set by the system, range2 is the upper threshold of thermal monitoring set by the system, Q heat_max is the maximum heat output of the heating module, which is determined by the inherent parameters of the microwave auxiliary heating module and is equivalent to a known value, Q heat_min is the minimum heating value of the heating module, which is determined by the inherent parameters of the microwave auxiliary heating module and is equivalent to a known value;

[0248]

[0249] Where HII is the thermal impact index calculated in real time, range1 is the lower threshold of thermal monitoring set by the system, range2 is the upper threshold of thermal monitoring set by the system, Q microwave_max is the maximum calorific value of the microwave auxiliary heating module, which is determined by the inherent parameters of the microwave auxiliary heating module and is equivalent to a known value, Q microwave_min is the minimum heating value of the microwave auxiliary heating module, and its value is determined by the inherent parameters of the microwave auxiliary heating module, which is equivalent to a known value;

[0250] Through the cooperation of the microwave auxiliary heating module, the heating module and the control module, the mixed raw materials are polymerized in the reactor 20, and the microwave auxiliary heating module continuously provides auxiliary heating to accelerate the polymerization process, thereby ensuring that the entire system has the advantages of rapid polymerization, precise control and high intelligence.

[0251] Optionally, the cooling and filtering module includes a cooling unit and a filtering unit, the cooling unit receives the reaction raw materials after the reaction in the reactor 20 and cools the reaction raw materials, and the filtering unit filters the reaction raw materials after the cooling operation to filter out impurities in the reaction raw materials to obtain the conformal coating mother solution 39;

[0252] The cooling unit includes a cooling chamber 30, a cooling sub-chamber 33, a heat exchanger 31, a cooling water circulation component, a λ temperature sensor and a β pressure sensor. The cooling chamber 30 is used to receive the reaction raw materials after the reaction in the reactor 20. The cooling sub-chamber 33 stores cooling water and cools down the reaction raw materials in the cooling chamber 30. The cooling sub-chamber is nested on the periphery of the cooling chamber 30. The λ temperature sensor detects the temperature of the heat exchanger 31. The β pressure sensor detects the circulation pressure of the cooling medium in the heat exchanger 31. The cooling water circulation component provides circulating cooling water to take away the heat absorbed by the heat exchanger 31, so as to ensure that the heat exchanger 31 can continuously and effectively perform cooling operation.

[0253] The reactor 20 is provided with a connecting pipe 29 and a connecting control valve. The connecting control valve is arranged on the connecting pipe 29 and controls the on-off of the connecting pipe 29. One end of the connecting pipe 29 is connected to the bottom wall of the reactor 20, and the other end of the connecting pipe 29 is connected to the cooling chamber 33 to cool the reaction raw materials after the polymerization reaction.

[0254] The cooling water circulation component includes a cooling water pump 34 and a cooling water pipe 32. One end of the cooling pipe is connected to the water inlet of the heat exchanger 31, and the other end of the cooling water pipe 32 is connected to the water outlet of the heat exchanger 31. The other end of the cooling water pipe 32 is spirally arranged along the circumference of the cooling tank and takes away the heat in the cooling tank. The cooling water pump 34 is arranged in the cooling water pipe 32 and circulates the cooling water in the cooling water pipe 32, so that the heat is dissipated outside the cooling chamber 33 through the heat exchanger 31, and the cooling rate of the reactant raw materials is improved.

[0255] Wherein, the cooling unit is arranged on the filtering unit, and the cooling unit further comprises a pass electronic valve, which is arranged on the bottom wall of the cooling chamber 33 and is used to control the on-off of the reaction raw materials in the cooling chamber 33, so that the reaction raw materials can enter the filtering unit when the pass electronic valve is in a pass state;

[0256] The filter unit includes a filter chamber 38, a filter 25, a supercharger 36, and a γ pressure sensor 37. The filter chamber 38 is used to receive the reaction raw materials. The filter 25 is arranged in the filter chamber 38 and filters the reaction raw materials. The supercharger 36 is arranged in the filter chamber 38 and supercharges the pressure of the inlet and outlet sections to speed up the passage efficiency of the reaction raw materials through the filter 25. The γ pressure sensor 37 is respectively arranged at the feed end and the discharge end of the filter 25 and collects pressure data of the feed end and the discharge end. After the pressure sensor 37 collects the pressure data of the feed end and the discharge end, it directly feeds back to the supercharger 36, so that the supercharger 36 adjusts the pressure difference on both sides of the filter 25.

[0257] In this embodiment, the filter 25 is disposed across the middle of the filter chamber 38 and connected to the inner wall of the filter chamber 38 so as to filter the reaction raw materials entering the filter chamber 38;

[0258] If the pressure difference between the two sides of the filter 25 is not within the set range, the pressure on one side of the filter 25 is adjusted so that the pressure of the filter 25 is adjusted and the reaction raw materials can be filtered quickly;

[0259] like Figure 8 As shown, the cooling and filtering module further includes a communication pipe 35, which is disposed between the cooling chamber 33 and the filtering chamber 38, one end of the communication pipe 35 is connected to the cooling chamber 33, and the other end of the communication pipe 35 is connected to the filtering chamber 38;

[0260] The reaction raw materials are cooled and filtered by the cooling and filtering module, so that the conformal coating mother solution 39 can be quickly cooled and filtered, ensuring that the production of the entire conformal coating product has the advantages of high intelligence, high production efficiency, strong quality control capability, and simple operation;

[0261] In step S7, the nanoscale filler is placed in a plasma treatment module and subjected to surface pretreatment in a low temperature and low pressure environment to form active groups so that the surface of the nanoscale filler is compatible with the polyurethane matrix;

[0262] The plasma processing module includes an ion chamber 40, a β electron control valve, a plasma generator 41, a vacuum pump 49, a gas control component, a temperature control component, and a rotating component. The ion chamber 40 is used to place the nano-scale filler, the plasma generator 41, the vacuum pump 49, the gas control component, the temperature control component, and the rotating component. The ion chamber 40 provides a low-temperature, low-pressure environment to accommodate the nano-scale filler and ensure that the plasma uniformly contacts its surface. The plasma generator 41 generates plasma and generates high-energy active particles through ionized gas to treat the surface of the nano-scale filler; the vacuum pump 49 is used to reduce the processing The pressure in the cavity is controlled so that the desired low-pressure environment is achieved in the ion cavity 40, and the residual gas is evacuated after the treatment is completed; the gas control component is used to control the type and flow of gas entering the treatment cavity to generate a specific plasma environment, the temperature control component maintains the temperature of the treatment cavity and the nano-scale filler within a predetermined range to avoid overheating or overcooling and ensure the treatment effect, the rotating component is used to uniformly expose the nano-scale filler to the plasma during the treatment process to ensure the uniformity of the surface treatment, and the β electronic control valve is used to control the timing of the treated nano-scale filler entering the ultrasonic auxiliary module so that the nano-scale filler can participate in subsequent processes.

[0263] like Fig.12 The nano-scale filler also needs to be weighed by a weighing module and then put into the ion chamber 40 .

[0264] The gas control component includes a gas cylinder 47, a mass flow controller 45 (MFC), a valve 46 and a pipeline 48. The gas cylinder 47 is used to store specific gases (such as argon, oxygen, etc.). One end of the pipeline 48 is connected to the gas cylinder 47, and the other end is connected to the ion chamber 40. The valve 46 is used to control the on-off of the pipeline 48. The mass flow controller 45 controls the flow in the pipeline 48 to ensure the stability of the gas entering the ion chamber 40.

[0265] The mass flow controller 45 (MFC) is used to precisely adjust the gas flow rate to ensure the stability of the plasma and the treatment effect; the system can adjust different types of gas combinations to meet different treatment requirements;

[0266] The temperature control component includes a heater 50, a cooling subsystem and an ω temperature sensor. The heater 50 is used to increase the temperature inside the ion chamber 40 when necessary, and the cooling subsystem is used to prevent the equipment or filler from overheating. The ω temperature sensor monitors the temperature inside the chamber in real time and feeds back to the temperature control component for temperature regulation.

[0267] The cooling subsystem includes a water pipe 44, a water tank 42, and a water valve 43. The water valve 443 is used to control the on-off of the water pipe 44. The water tank 42 is used to store cooling water for cooling. The water tank 42 is spirally wound on the inner wall of the ion chamber 40 to cool the ion chamber 40.

[0268] The rotating component includes a rotating seat 67, a hidden cavity, and a rotating drive mechanism 68. The hidden cavity is arranged on the bottom wall of the ion cavity 40. The rotating drive mechanism 68 is drivingly connected to the rotating seat 67 to form a rotating part. The rotating part is hidden in the hidden cavity. The side edge of the rotating seat 67 is provided with a limiting groove, and the limiting protrusion of the ion cavity 40 is engaged with the limiting protrusion and the limiting groove, so that the rotating part can rotate along its own axis during the driving process.

[0269] When the weighed nanofiller enters the ion chamber 40, the rotation of the rotating component can evenly expose the nanofiller to the plasma environment to prevent the filler from aggregating during the treatment process, and can also keep the powder filler moving in the ion chamber 40 to increase the contact area with the plasma.

[0270] The specific working process of the plasma processing module includes:

[0271] S21. Pretreatment preparation:

[0272] Place the nano-scale filler on a rotating platform or stirring device in the ion chamber 40, close the chamber and start the vacuum pump 49 to exhaust the air in the chamber to achieve the desired low pressure environment;

[0273] S22. Gas introduction and plasma generation:

[0274] Open the gas control system, introduce the processing gas (such as argon, oxygen, etc.), start the plasma generator, generate plasma, and make it fully contact with the surface of the nanofiller;

[0275] S23, surface treatment:

[0276] Under low temperature and low pressure conditions, the active particles in the plasma react with the surface of the nanofiller to generate active groups, which change the surface energy and make it more compatible with the polyurethane matrix;

[0277] S24, temperature and gas monitoring:

[0278] During the treatment process, the control system monitors the temperature and gas flow in the chamber in real time to ensure stable treatment conditions; if the temperature or pressure deviates from the set value, the system will automatically adjust;

[0279] S25, treatment completion and gas emission:

[0280] After the treatment is completed, the plasma generator and the gas control system are turned off, and the remaining gas in the cavity is evacuated using the vacuum pump 49 to ensure the safety of the environment in the cavity;

[0281] S26, take out the filler:

[0282] Open the β electronic control valve to allow the surface-treated nano-scale filler in the ion chamber 40 to enter the ultrasonic auxiliary module for subsequent operations;

[0283] Among them, the plasma generator includes a high-frequency power supply and an electrode system. The high-frequency power supply (such as a radio frequency power supply or a microwave power supply) provides a high-frequency voltage to ionize the gas to form plasma; the electrode system applies the high-frequency voltage to the gas in the processing chamber to generate plasma.

[0284] At the same time, the processing gas (such as argon, oxygen, nitrogen, etc.) is introduced into the processing chamber, ionized to form plasma, and directly contacts the nano-scale filler to form surface active groups;

[0285] In this embodiment, the nano-machine filler includes but is not limited to the following: nano-silica (Nano-Silica, SiO2), nano-alumina (Nano-Alumina, Al2O3), nano-titanium oxide (Nano-Titania, TiO2), nano-zinc oxide (Nano-Zinc Oxide, ZnO), nano-montmorillonite (Nano-Montmorillonite, MMT), carbon nanotubes (Carbon Nanotubes, CNTs), and nano-graphene (Nano-Graphene).

[0286] In this embodiment, after the nano-scale filler is treated by the plasma treatment module, the dispersibility, mechanical strength, adhesion, chemical corrosion resistance, weather resistance and other functional properties of the three-conformal paint product are improved, and the three-conformal paint coating is improved to perform well in a wider range of application fields, and can provide stronger protection and longer service life for the substrate.

[0287] In step S8, the pretreated nanofiller is added to the conformal coating mother solution 39, dispersed by an ultrasonic auxiliary module, and multiple interface enhancers are added to form a conformal coating product.

[0288] The ultrasonic auxiliary module includes a synthesis chamber 53, an ultrasonic generator, an ultrasonic transducer 55, an ultrasonic probe, a heat dissipation component, a stirring component, and an injection component. The synthesis chamber 53 is used to place the ultrasonic generator, the ultrasonic transducer 55, the ultrasonic probe, the heat dissipation component, the stirring component, and the injection component. The ultrasonic generator generates a high-frequency electrical signal and transmits it to the ultrasonic transducer 55, driving the ultrasonic transducer 55 to emit an ultrasonic wave. The ultrasonic transducer 55 converts the electrical signal generated by the ultrasonic generator into a mechanical vibration, and emits an ultrasonic wave into the conformal coating mother solution 39. The ultrasonic probe introduces the ultrasonic wave into the liquid to enhance the transmission efficiency of the acoustic energy in the liquid, and ensures that the nano-filler and the conformal coating mother solution 39 are uniformly dispersed. The heat dissipation component controls the heat generated during the ultrasonic dispersion process to prevent the temperature from increasing and causing adverse effects on the dispersion effect. The stirring component is used to stir the conformal coating mother solution 39 and the nano-filler, so that in the ultrasonic-assisted dispersion process, the conformal coating mother solution 39 is kept flowing and uniformly mixed to avoid filler precipitation or local over-dispersion. The injection component is used to accurately control the amount of the added multi-interface enhancer and ensure that the enhancer is uniformly mixed in the conformal coating mother solution 39.

[0289] The cooling and filtering module further includes a flow pipe 65 and a flow control valve 66. The flow control valve 66 is disposed on the flow pipe 65 and controls the on-off of the flow pipe 65. One end of the flow pipe 65 is connected to the bottom wall of the filter chamber 38, and the other end of the flow pipe 65 is connected to the synthesis chamber 53, and the conformal coating mother liquid 39 is supplied to the synthesis chamber 53 for the next processing step.

[0290] The heat dissipation component includes a circulation pipeline 56, a coolant, a liquid storage tank 61 and a circulation pump 57. The liquid storage tank 61 is used to store the coolant, and the liquid storage tank 61 is provided with a water inlet end and a water outlet end. The circulation pipeline 56 is arranged to rise in a spiral along the inner layer of the synthesis chamber 53, and the two ends of the circulation pipeline 56 are respectively connected to the water inlet end and the water outlet end of the liquid storage chamber. The circulation pump 57 is arranged on the circulation pipeline 56, and allows the coolant to circulate in the circulation pipeline 56.

[0291] The stirring member includes a stirring rod 54, a stirring drive mechanism and a placement seat 51, wherein the placement seat 51 is arranged in the synthesis chamber 53 and supports the stirring drive mechanism, wherein the placement seat 51 is connected to the inner wall of the synthesis chamber 53 so that the axis of the stirring rod 54 is coaxially arranged with the axis of the synthesis chamber 53, one end of the stirring rod 54 is drivingly connected to the stirring drive mechanism to form a stirring portion 52, and the stirring portion 52 is arranged on the placement seat 51, and the other end of the stirring rod 54 extends toward a side away from the placement seat 51, and stirs the three-proof paint mother solution 39, nanofiller, and multiple interface enhancer in the synthesis chamber 53;

[0292] The injection component includes a storage tank 60, a metering pump 63 and an injection pipeline 62. The storage tank 60 is used to store the multiple interface enhancer. One end of the injection pipeline 62 is connected to the tank wall of the storage tank 60, and the other end of the injection pipeline extends into the synthesis chamber 53. The metering pump is arranged on the injection pipeline 62 and accurately controls the injection speed and amount of the enhancer. The injection pipeline 62 ensures that the enhancer directly enters the dispersion zone and is fully mixed with the three-proof paint mother solution 39 and the nano filler.

[0293] At the same time, the multiple interface enhancers also need to be accurately weighed and put into the synthesis chamber 53; in addition, the required weight of the multiple interface enhancers also needs to be input by the operator from the human-machine interface and transmitted to the dosage pump, and the dosage pump is accurately controlled;

[0294] In addition, in this embodiment, the multiple interface enhancers include silane coupling agents (such as 3-aminopropyltriethoxysilane (APTES), methyltrimethoxysilane (MTMS), epoxysilane (such as 3-glycidyloxypropyltrimethoxysilane)), titanate coupling agents (such as tetraisopropyldi(dodecylphosphate) titanate (such as KR-TTS), diethyl dichlorotitanate), phosphate coupling agents (such as calcium phosphate polyacrylamide phosphate), organic tin compounds (such as dibutyltin dichloride (DBTC), dibutyltin dilaurate),

[0295] (DBTL)), polyether polyols (such as polyethylene glycol (PEG), polypropylene glycol (PPG)), phosphonic acid coupling agents (such as adipic acid phosphonic acid (HDP), hydroxyphosphonic acid), organic sulfides (such as thioglycolic acid, disulfide compounds), and polymer tackifiers (such as polyvinyl alcohol (PVA), polyurethane (PU));

[0296] The weighing module weighs all the raw materials, and all the raw materials except the nanofillers and multiple interface enhancers enter the mixing module for mixing. After the mixing is qualified, a mixed raw material is formed, and the mixed raw material is heated. The heated mixed raw material is transferred to the reactor, and a polymerization reaction is carried out in the reactor to form a polyurethane matrix. The polyurethane matrix is ​​cooled and filtered in the cooling and filtration module to form a conformal coating mother liquor. The weighed nanofillers are treated by the plasma treatment module and transferred to the ultrasonic auxiliary module together with the conformal coating mother liquor. In this step, the conformal coating mother liquor, the treated nanofillers, and the multiple interface enhancers are ultrasonically dispersed to fully fuse the conformal coating mother liquor, the treated nanofillers, and the multiple interface enhancers to form a conformal coating product.

[0297] In this embodiment, the multiple interface enhancers used need to be determined according to actual needs, so they will not be described one by one in this embodiment;

[0298] In this embodiment, the ultrasonic auxiliary module is used to assist in the dispersion of the conformal coating concentrate 39, the nanofiller, and the multiple interface enhancers, thereby effectively ensuring that the entire system has the advantages of enhanced interface bonding strength, coating uniformity, long-term stability, weather resistance, aging resistance, and chemical corrosion resistance.

[0299] Embodiment 2: This embodiment should be understood to include all the features of any of the above embodiments, and further improve upon them. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 and Fig.12 As shown, it also includes a quality assessment module, which assesses the quality of the conformal coating product.

[0300] The quality assessment module is disposed in the synthesis chamber 53 and assesses the quality of the conformal coating product.

[0301] Specifically, the quality assessment module includes a data acquisition unit and a quality assessment unit, the data acquisition unit acquires key quality parameters of the conformal coating product, and the quality assessment unit performs quality assessment on the conformal coating product according to the key quality parameters acquired by the data acquisition unit.

[0302] The data acquisition unit includes an online viscometer 24, an optical acquisition component, a ζ temperature sensor, an online densitometer, and a steering component. The online viscometer 24 measures the viscosity of the conformal coating product in the processing chamber in real time, monitors the mixing uniformity and fluidity to ensure the quality of the product. The optical acquisition component monitors the transparency or turbidity of the conformal coating mother solution 39. The ζ temperature sensor monitors the temperature of the conformal coating product in the processing chamber. The online densitometer measures the density of the conformal coating product in the processing chamber. The steering component adjusts the positions of the online viscometer 24, the optical acquisition component, the ζ temperature sensor, and the online densitometer so that the online viscometer 24, the optical acquisition component, the ζ temperature sensor, and the online densitometer can collect data at different positions in the synthesis chamber 53.

[0303] The optical collection component includes a light emitter 70 and a light receiver. The light emitter 70 is used to emit a beam of light, and the light receiver is used to receive the light intensity emitted by the light emitter 70.

[0304] The light emitted by the light emitter 70 passes through the conformal coating mother liquid 39 in the processing chamber. If the nanofiller is well dispersed, the light will pass through the liquid more evenly; if it is unevenly dispersed, the light will be scattered or absorbed, thereby reducing the light intensity at the receiving end.

[0305] The light receiver is used to receive the light passing through the liquid and measure its intensity. The detector is usually a photodiode, a photoresistor or a phototransistor.

[0306] Among them, the light receiver records the change in intensity of light after passing through the liquid; if the liquid is highly transparent (well dispersed), the light intensity received by the light detector is greater; if the liquid is turbid or the filler is poorly dispersed, the light intensity received by the light detector will be significantly reduced.

[0307] The inner wall of the synthesis chamber 53 is provided with a storage groove for placing the rotating member, and the storage groove is coaxially arranged with the synthesis chamber 53;

[0308] The rotating component includes a first rotating seat 58, a second rotating seat 59, a connecting rod 69, a rotating track 64, a rotating driving mechanism, an identification probe, and at least two positioning marking members. The rotating track 64 is arranged on the bottom wall of the storage slot. The first rotating seat 58 and the second rotating seat 59 are respectively arranged opposite to each other and are slidably connected to the rotating track 64. The two ends of the connecting rod 69 are connected to the first rotating seat 58 and the second rotating seat 59 so that the first rotating seat 58 and the second rotating seat 59 can be arranged opposite to each other. The rotating driving mechanism is arranged on the first rotating seat 58 and the second rotating seat 59, and drives the first rotating seat 58 and the second rotating seat 59 to slide along the direction of the rotating track 64. At least two positioning marking members are arranged at equal intervals along the length direction of the rotating track 64. The identification probe is arranged on the first positioning seat and extends toward the position of the positioning marking member to identify the positioning mark member.

[0309] The rotating track 64 is set as a circular track and is coaxially arranged with the synthesis cavity 53;

[0310] In this embodiment, through the cooperation among the rotating member, the linear viscometer 24, the optical collection member, the ζ temperature sensor, and the online density meter, the linear viscometer 24, the optical collection member, the temperature sensor, and the online density meter can collect data at different positions in the synthesis chamber 53;

[0311] In this embodiment, the key quality parameters include viscosity, dispersion state data, transparency or turbidity, density and temperature;

[0312] The quality assessment unit obtains the key quality parameters collected by the data collection unit and calculates the qualified index Q according to the following formula: PASS :

[0313]

[0314] Where η Q is the viscosity data in the synthesis cavity, and its value is collected by an online viscometer, T transparency is the transparency or turbidity in the synthesis chamber, ρ is the density in the synthesis chamber, and its value is measured by an online density meter, T Q is the temperature in the synthesis chamber, and its value is measured by a ζ temperature sensor;

[0315] The transparency or turbidity T in the synthetic cavity transparency To calculate according to the following formula:

[0316]

[0317] In the formula, I0 is the intensity of light emitted by the optical transmitter, and I is the intensity of light received by the receiver;

[0318] If the qualified index QPASS is greater than or equal to the qualified monitoring threshold Qthreshold set by the system, it means that the conformal coating product is qualified and meets the requirements of all key quality parameters;

[0319] If the qualified index QPASS is lower than the qualified monitoring threshold Qthreshold set by the system, it means that the conformal coating product is unqualified and the production parameters need to be readjusted or reworked;

[0320] Among them, the qualified threshold Qthreshold set by the system is set by the system according to actual conditions. This is a technical means well known to technicians in this field. Technicians in this field can refer to relevant technical manuals to learn about this technology, so it will not be described one by one in this embodiment.

[0321] When the conformal coating product's qualified index QPASS is lower than the preset threshold Qthreshold, it indicates that the product is unqualified and the parameters in the production process need to be adjusted. The specific adjustment of the proportion of which raw materials needs to be analyzed based on the key quality parameters that affect QPASS (such as viscosity, transparency, density and temperature). The following are possible adjustment directions and methods.

[0322] 1) Adjustment of viscosity parameters:

[0323] Adjust viscosity: Deviations in viscosity usually reflect improper proportions of resin, diluent, curing agent or additives;

[0324] Increase the resin ratio: If the viscosity is low, you can consider increasing the resin ratio to increase the viscosity of the system;

[0325] Reduce the diluent ratio: If the viscosity is too low, there may be too much diluent, and the diluent ratio can be appropriately reduced;

[0326] Increasing the curing agent ratio: Increasing the curing agent ratio can also increase viscosity, especially when the curing reaction is not complete.

[0327] 2) Adjustment of transparency or turbidity:

[0328] Adjust transparency: Insufficient transparency may be caused by over-dispersion of nanofillers, incompatibility of resin and fillers, or air bubbles;

[0329] Adjust the ratio of filler and diluent: Improve the transparency of the liquid by adjusting the ratio of nanofiller and diluent;

[0330] Add deaerator or adjust stirring method: If bubbles are the main problem, consider adding deaerator or adjusting the stirring process to reduce the generation of bubbles.

[0331] 3) Adjustment of density parameters:

[0332] Adjust density: Abnormal density may reflect improper proportions of resin, filler, or diluent;

[0333] Adjust the filler ratio: if the density is too high, consider reducing the filler ratio; if the density is too low, you may need to increase the filler or reduce the diluent ratio;

[0334] Adjusting the resin ratio: The resin ratio has a significant impact on the density, so properly adjusting the resin ratio can also help achieve the ideal density.

[0335] 4) Temperature adjustment:

[0336] Control reaction temperature: temperature abnormalities often affect the viscosity, curing degree and dispersion state of the material;

[0337] Adjust heating or cooling rate: By adjusting the heating or cooling rate, ensure that the temperature is within the set range to prevent overheating or overcooling from affecting quality parameters;

[0338] Optimize curing conditions: adjust the temperature and time of the curing process to ensure sufficient curing and avoid quality problems caused by insufficient curing.

[0339] In this embodiment, the quality of the conformal coating product is evaluated through the quality assessment module, which effectively improves the quality of the conformal coating product and ensures that the entire system has the advantages of strong quality control capability, accurate quality assessment, and high intelligence.

[0340] The contents disclosed above are only preferred feasible embodiments of the present invention, and do not limit the protection scope of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention specification and drawings are included in the protection scope of the present invention. In addition, the elements therein can be updated as technology develops.

Claims

1. A method for preparing a polyurethane conformal coating, characterized in that: The polyurethane conformal coating preparation method comprises the following steps: S1. The operator sets the requirements for conformal coating products and the environmental conditions used, and inputs them into the weighing module, thereby triggering the weighing module to automatically adjust the ratio of raw materials, which include polyurethane resin, curing agent, diluent, additives and nano-scale fillers; S2, adding the weighed polyurethane resin, curing agent, diluent, and auxiliary agent to the mixing module in sequence, starting low-speed mixing, and gradually increasing the stirring speed to allow the raw materials to be fully mixed to form a mixed raw material, and collecting state data of the mixed raw materials during the mixing process through a monitoring module; S3, obtaining the state data collected by the monitoring module through the evaluation module, and evaluating the mixed state to form an evaluation result; S4. If the evaluation result meets the mixing qualified threshold range, heating the mixed raw materials in the mixing process by a heating module; S5, transferring the heated mixed raw materials to a reactor to form a reaction raw material, performing a polymerization reaction on the reaction raw material at a temperature of 60 to 80° C. for 2 to 4 hours, and continuously performing an auxiliary reaction on the reactor through a microwave auxiliary heating module to accelerate the polymerization process, while coordinating with a control module to adjust the reaction conditions in real time; S6. After the reaction is completed, stop heating, start the cooling and filtering module, quickly cool the reaction raw materials to room temperature, and use the cooling and filtering module to remove impurities to obtain a clear and transparent conformal coating mother liquor; S7, placing the nano-scale filler in a plasma treatment module, and performing surface pretreatment under a low temperature and low pressure environment to form active groups so that the surface of the nano-scale filler is compatible with the polyurethane matrix; S8. Add the pretreated nanofiller into the conformal coating mother solution, disperse it through an ultrasonic auxiliary module, and add multiple interface enhancers to form a conformal coating product.

2. A method for preparing a polyurethane conformal coating as claimed in claim 1, characterized in that: The preparation method is implemented by a polyurethane conformal coating preparation system, and the preparation system includes a server, a weighing module, a mixing module, a monitoring module, an evaluation module, a heating module, a microwave auxiliary heating module, a control module, a cooling and filtering module, a plasma processing module, and an ultrasonic auxiliary module. The server is respectively connected to the weighing module, the mixing module, the monitoring module, the evaluation module, the heating module, the microwave auxiliary heating module, the control module, the cooling and filtering module, the plasma processing module, and the ultrasonic auxiliary module; The weighing module allows the operator to input the requirements of the conformal coating product and the environmental conditions used, and triggers the analysis of the raw materials to form a ratio result, so that the raw materials are weighed according to the retracted ratio result. The mixing module mixes the weighed and ratioed raw materials. The monitoring module collects the state data of the raw materials in the mixing module. The evaluation module evaluates the mixing state according to the state data collected by the monitoring module to form an evaluation result. The heating module heats the mixed raw materials that meet the qualified mixing threshold range. The microwave auxiliary heating module performs microwave-assisted heating on the mixed raw materials. The control module collects the process data of the heating process of the mixed raw materials, and analyzes the process data to form an analysis result. At the same time, the heating module and the microwave auxiliary heating module are controlled according to the analysis result. The cooling and filtering module cools and filters the heated mixed raw materials. The plasma processing module processes the nano-scale filler and transports the pretreated nano-filler to the ultrasonic auxiliary module. The ultrasonic auxiliary module adds the pretreated nano-filler to the conformal coating mother liquid and performs a dispersion operation, and adds multiple interface enhancers to form a conformal coating product.

3. A method for preparing a polyurethane conformal coating as claimed in claim 2, characterized in that: The weighing module includes an interaction unit, a raw material mixing unit and a weighing unit. The interaction unit allows the operator to set and submit the requirements of the three-proof paint product and the environmental conditions used. The raw material mixing unit mixes the raw materials according to the requirements of the three-proof paint product and the environmental conditions used collected by the interaction unit to form a ratio result. The weighing unit weighs the raw materials respectively according to the ratio result.

4. A method for preparing a polyurethane conformal coating as claimed in claim 3, characterized in that: The mixing module includes a mixing tank, a mixing unit and a position adjustment unit. The mixing tank is used to place weighed raw materials. The mixing unit performs a mixing operation on the raw materials in the mixing tank. The position adjustment unit adjusts the position of the mixing unit so that the raw materials put into the mixing tank can be fully mixed to form mixed raw materials. The mixing unit and the position adjustment unit are arranged in the mixing tank, and the raw materials in the mixing tank are put into the mixing tank for mixing operation.

5. A method for preparing a polyurethane conformal coating as claimed in claim 4, characterized in that: The monitoring module includes a monitoring unit and a data storage device, wherein the monitoring unit is used to collect state data of the mixing process of the mixed raw materials, and the data storage device stores the state data of the mixing process of the mixed raw materials collected by the monitoring unit; Wherein, the monitoring unit is arranged in the mixing tank, and the monitoring unit includes an online rotational viscometer, an infrared temperature sensor, and a torque sensor. The online rotational viscometer is used to measure the viscosity data of the raw material, the infrared temperature sensor is used to collect the temperature data of the raw material, and the torque sensor measures the torque change of the stirring shaft of the mixing unit to evaluate the shear force data of the mixture.

6. A method for preparing a polyurethane conformal coating as claimed in claim 5, characterized in that: The evaluation module obtains the state data collected by the monitoring module and calculates the mixed state index MIX according to the following formula: Wherein, η is the dynamic viscosity of the current mixture, η0 is the reference viscosity set by the system, τ is the shear force applied to the current mixture during stirring, τ0 is the shear force set by the system, T is the temperature of the current mixture, and T0 is the reference temperature set by the system; If the mixing state index MIX does not fall within the system-set mixing qualified threshold range [MIXthreshold1, MIXthreshold2], the mixed raw materials are allowed to enter the next step of operation.

7. A method for preparing a polyurethane conformal coating as claimed in claim 6, characterized in that: The heating module includes a heating chamber, a heating element and a heating control unit. The heating chamber is arranged in the inner wall of the mixing tank. The heating element is arranged in the heating chamber and spirally rises along the length direction of the heating chamber and surrounds the inner wall of the mixing tank. The heating control unit controls the heating temperature of the heating element.

8. A method for preparing a polyurethane conformal coating as claimed in claim 7, characterized in that: The microwave auxiliary heating module includes a lifting unit, a microwave unit and a cooling unit. The lifting unit adjusts the positions of the microwave unit and the cooling unit. The microwave unit performs auxiliary heating on the mixed raw materials, and the cooling unit cools the microwave unit.

9. A method for preparing a polyurethane conformal coating as claimed in claim 8, characterized in that: The control module includes a sampling unit, an analysis unit and a control unit, wherein the sampling unit collects process data in the reactor, the analysis unit analyzes the reaction process in the reactor according to the process data collected by the sampling unit to form an analysis result, and the control unit controls the heating module and the microwave auxiliary heating module according to the analysis result; The process data include temperature, pressure, and viscosity data of reactants in the reactor.

10. A method for preparing a polyurethane conformal coating as claimed in claim 9, characterized in that: The cooling and filtering module includes a cooling unit and a filtering unit. The cooling unit receives the reaction raw materials that have been reacted in the reactor and cools the reaction raw materials. The filtering unit filters the reaction raw materials after the cooling operation to filter out impurities in the reaction raw materials to obtain a conformal coating mother liquid.

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